java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_oct_cong.epf -i ../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/HiddenEqualityWithBranches.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 18:10:42,136 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 18:10:42,138 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 18:10:42,152 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 18:10:42,152 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 18:10:42,154 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 18:10:42,155 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 18:10:42,158 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 18:10:42,160 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 18:10:42,163 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 18:10:42,165 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-12-03 18:10:42,211 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_oct_cong.epf [2018-12-03 18:10:42,230 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 18:10:42,231 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 18:10:42,232 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 18:10:42,232 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 18:10:42,233 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 18:10:42,233 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 18:10:42,233 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 18:10:42,234 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 18:10:42,234 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 18:10:42,234 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 18:10:42,234 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 18:10:42,234 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 18:10:42,235 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 18:10:42,236 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 18:10:42,236 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 18:10:42,236 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 18:10:42,237 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 18:10:42,237 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 18:10:42,237 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 18:10:42,237 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 18:10:42,237 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 18:10:42,238 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 18:10:42,238 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 18:10:42,238 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 18:10:42,238 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 18:10:42,238 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 18:10:42,239 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 18:10:42,240 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 18:10:42,241 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 18:10:42,241 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 18:10:42,241 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 18:10:42,241 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 18:10:42,241 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 18:10:42,242 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 18:10:42,242 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 18:10:42,242 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 18:10:42,242 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 18:10:42,242 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 18:10:42,243 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 18:10:42,298 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 18:10:42,312 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 18:10:42,318 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 18:10:42,320 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 18:10:42,321 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 18:10:42,322 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/HiddenEqualityWithBranches.bpl [2018-12-03 18:10:42,322 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/HiddenEqualityWithBranches.bpl' [2018-12-03 18:10:42,367 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 18:10:42,369 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 18:10:42,370 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 18:10:42,370 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 18:10:42,370 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 18:10:42,392 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 06:10:42" (1/1) ... [2018-12-03 18:10:42,403 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 06:10:42" (1/1) ... [2018-12-03 18:10:42,412 WARN L165 Inliner]: Program contained no entry procedure! [2018-12-03 18:10:42,412 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2018-12-03 18:10:42,413 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2018-12-03 18:10:42,416 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 18:10:42,417 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 18:10:42,417 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 18:10:42,417 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 18:10:42,431 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:10:42" (1/1) ... [2018-12-03 18:10:42,432 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:10:42" (1/1) ... [2018-12-03 18:10:42,432 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:10:42" (1/1) ... [2018-12-03 18:10:42,433 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:10:42" (1/1) ... [2018-12-03 18:10:42,437 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:10:42" (1/1) ... [2018-12-03 18:10:42,443 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:10:42" (1/1) ... [2018-12-03 18:10:42,444 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:10:42" (1/1) ... [2018-12-03 18:10:42,446 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 18:10:42,447 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 18:10:42,447 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 18:10:42,448 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 18:10:42,452 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:10:42" (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 18:10:42,527 INFO L124 BoogieDeclarations]: Specification and implementation of procedure main given in one single declaration [2018-12-03 18:10:42,527 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-03 18:10:42,528 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-03 18:10:42,679 INFO L272 CfgBuilder]: Using library mode [2018-12-03 18:10:42,680 INFO L280 CfgBuilder]: Removed 1 assue(true) statements. [2018-12-03 18:10:42,680 INFO L202 PluginConnector]: Adding new model HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 06:10:42 BoogieIcfgContainer [2018-12-03 18:10:42,680 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 18:10:42,682 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 18:10:42,682 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 18:10:42,685 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 18:10:42,686 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:10:42" (1/2) ... [2018-12-03 18:10:42,687 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@242fdc10 and model type HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 06:10:42, skipping insertion in model container [2018-12-03 18:10:42,687 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 06:10:42" (2/2) ... [2018-12-03 18:10:42,689 INFO L112 eAbstractionObserver]: Analyzing ICFG HiddenEqualityWithBranches.bpl [2018-12-03 18:10:42,700 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 18:10:42,709 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 18:10:42,728 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 18:10:42,766 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 18:10:42,766 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 18:10:42,766 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 18:10:42,767 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 18:10:42,767 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 18:10:42,767 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 18:10:42,767 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 18:10:42,767 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 18:10:42,785 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-12-03 18:10:42,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2018-12-03 18:10:42,792 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:42,793 INFO L402 BasicCegarLoop]: trace histogram [1, 1] [2018-12-03 18:10:42,796 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:42,802 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:42,803 INFO L82 PathProgramCache]: Analyzing trace with hash 978, now seen corresponding path program 1 times [2018-12-03 18:10:42,806 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:42,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:42,868 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:42,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:42,868 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:42,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:42,972 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 18:10:42,975 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 18:10:42,975 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2018-12-03 18:10:42,976 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 18:10:42,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 18:10:42,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 18:10:42,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 18:10:42,999 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-12-03 18:10:43,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:43,085 INFO L93 Difference]: Finished difference Result 14 states and 20 transitions. [2018-12-03 18:10:43,086 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 18:10:43,088 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 2 [2018-12-03 18:10:43,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:43,106 INFO L225 Difference]: With dead ends: 14 [2018-12-03 18:10:43,106 INFO L226 Difference]: Without dead ends: 5 [2018-12-03 18:10:43,122 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 18:10:43,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-12-03 18:10:43,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-12-03 18:10:43,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-12-03 18:10:43,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 7 transitions. [2018-12-03 18:10:43,202 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 7 transitions. Word has length 2 [2018-12-03 18:10:43,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:43,202 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 7 transitions. [2018-12-03 18:10:43,205 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 18:10:43,205 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 7 transitions. [2018-12-03 18:10:43,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-03 18:10:43,205 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:43,206 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-03 18:10:43,206 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:43,211 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:43,211 INFO L82 PathProgramCache]: Analyzing trace with hash 931598, now seen corresponding path program 1 times [2018-12-03 18:10:43,211 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:43,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:43,213 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:43,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:43,213 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:43,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:43,320 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 18:10:43,320 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 18:10:43,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-03 18:10:43,320 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 18:10:43,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 18:10:43,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 18:10:43,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 18:10:43,326 INFO L87 Difference]: Start difference. First operand 5 states and 7 transitions. Second operand 3 states. [2018-12-03 18:10:43,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:43,398 INFO L93 Difference]: Finished difference Result 9 states and 14 transitions. [2018-12-03 18:10:43,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 18:10:43,400 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-12-03 18:10:43,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:43,401 INFO L225 Difference]: With dead ends: 9 [2018-12-03 18:10:43,401 INFO L226 Difference]: Without dead ends: 6 [2018-12-03 18:10:43,403 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 18:10:43,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2018-12-03 18:10:43,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2018-12-03 18:10:43,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-12-03 18:10:43,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 8 transitions. [2018-12-03 18:10:43,406 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 8 transitions. Word has length 4 [2018-12-03 18:10:43,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:43,407 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 8 transitions. [2018-12-03 18:10:43,407 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 18:10:43,407 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 8 transitions. [2018-12-03 18:10:43,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-03 18:10:43,407 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:43,408 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-03 18:10:43,409 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:43,409 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:43,409 INFO L82 PathProgramCache]: Analyzing trace with hash 931660, now seen corresponding path program 1 times [2018-12-03 18:10:43,409 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:43,410 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:43,417 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:43,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:43,417 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:43,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:43,577 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 18:10:43,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:43,578 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:43,579 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 5 with the following transitions: [2018-12-03 18:10:43,581 INFO L205 CegarAbsIntRunner]: [0], [8], [14], [17] [2018-12-03 18:10:43,642 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 18:10:43,643 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 18:10:43,909 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-12-03 18:10:43,911 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 18:10:43,931 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:43,931 INFO L401 sIntCurrentIteration]: Generating AbsInt predicates [2018-12-03 18:10:43,969 INFO L219 lantSequenceWeakener]: Could never weaken! [2018-12-03 18:10:43,970 INFO L416 sIntCurrentIteration]: Unifying AI predicates [2018-12-03 18:10:44,018 INFO L418 sIntCurrentIteration]: We unified 3 AI predicates to 3 [2018-12-03 18:10:44,018 INFO L427 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-12-03 18:10:44,019 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-12-03 18:10:44,019 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [2] total 4 [2018-12-03 18:10:44,020 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 18:10:44,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 18:10:44,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 18:10:44,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 18:10:44,021 INFO L87 Difference]: Start difference. First operand 6 states and 8 transitions. Second operand 4 states. [2018-12-03 18:10:44,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:44,246 INFO L93 Difference]: Finished difference Result 11 states and 18 transitions. [2018-12-03 18:10:44,246 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 18:10:44,246 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2018-12-03 18:10:44,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:44,247 INFO L225 Difference]: With dead ends: 11 [2018-12-03 18:10:44,247 INFO L226 Difference]: Without dead ends: 8 [2018-12-03 18:10:44,248 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 18:10:44,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-12-03 18:10:44,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2018-12-03 18:10:44,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 18:10:44,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 10 transitions. [2018-12-03 18:10:44,253 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 10 transitions. Word has length 4 [2018-12-03 18:10:44,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:44,254 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 10 transitions. [2018-12-03 18:10:44,254 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 18:10:44,254 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 10 transitions. [2018-12-03 18:10:44,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 18:10:44,255 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:44,255 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-12-03 18:10:44,257 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:44,257 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:44,257 INFO L82 PathProgramCache]: Analyzing trace with hash 895315078, now seen corresponding path program 1 times [2018-12-03 18:10:44,258 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:44,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:44,259 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:44,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:44,260 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:44,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:44,331 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 18:10:44,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:44,333 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:44,333 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2018-12-03 18:10:44,334 INFO L205 CegarAbsIntRunner]: [0], [6], [8], [12], [14], [17] [2018-12-03 18:10:44,336 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 18:10:44,336 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 18:10:44,488 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 18:10:44,489 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 18:10:44,506 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:44,508 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 18:10:44,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:44,508 INFO 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 18:10:44,523 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:44,524 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:10:44,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:44,548 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:44,667 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 18:10:44,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:44,726 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 18:10:44,747 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:44,747 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2018-12-03 18:10:44,747 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:44,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 18:10:44,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 18:10:44,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-12-03 18:10:44,748 INFO L87 Difference]: Start difference. First operand 7 states and 10 transitions. Second operand 4 states. [2018-12-03 18:10:44,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:44,835 INFO L93 Difference]: Finished difference Result 12 states and 18 transitions. [2018-12-03 18:10:44,836 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 18:10:44,836 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-12-03 18:10:44,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:44,836 INFO L225 Difference]: With dead ends: 12 [2018-12-03 18:10:44,836 INFO L226 Difference]: Without dead ends: 9 [2018-12-03 18:10:44,837 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 18:10:44,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-12-03 18:10:44,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-12-03 18:10:44,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 18:10:44,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 12 transitions. [2018-12-03 18:10:44,841 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 12 transitions. Word has length 6 [2018-12-03 18:10:44,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:44,841 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 12 transitions. [2018-12-03 18:10:44,841 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 18:10:44,842 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 12 transitions. [2018-12-03 18:10:44,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 18:10:44,842 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:44,842 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1] [2018-12-03 18:10:44,842 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:44,843 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:44,843 INFO L82 PathProgramCache]: Analyzing trace with hash 1406227200, now seen corresponding path program 2 times [2018-12-03 18:10:44,843 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:44,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:44,844 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:44,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:44,845 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:44,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:44,937 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 18:10:44,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:44,938 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:44,938 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:44,938 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:44,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:44,941 INFO 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 18:10:44,953 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:10:44,953 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:10:45,021 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 18:10:45,021 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:45,023 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:45,143 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 18:10:45,144 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:45,299 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 18:10:45,319 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:45,319 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 10 [2018-12-03 18:10:45,319 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:45,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 18:10:45,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 18:10:45,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-03 18:10:45,321 INFO L87 Difference]: Start difference. First operand 9 states and 12 transitions. Second operand 7 states. [2018-12-03 18:10:45,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:45,391 INFO L93 Difference]: Finished difference Result 18 states and 30 transitions. [2018-12-03 18:10:45,392 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 18:10:45,392 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 8 [2018-12-03 18:10:45,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:45,393 INFO L225 Difference]: With dead ends: 18 [2018-12-03 18:10:45,393 INFO L226 Difference]: Without dead ends: 15 [2018-12-03 18:10:45,393 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 18:10:45,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-12-03 18:10:45,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-12-03 18:10:45,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 18:10:45,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 20 transitions. [2018-12-03 18:10:45,398 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 20 transitions. Word has length 8 [2018-12-03 18:10:45,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:45,398 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 20 transitions. [2018-12-03 18:10:45,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 18:10:45,399 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 20 transitions. [2018-12-03 18:10:45,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 18:10:45,400 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:45,400 INFO L402 BasicCegarLoop]: trace histogram [5, 3, 3, 1, 1, 1] [2018-12-03 18:10:45,400 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:45,400 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:45,401 INFO L82 PathProgramCache]: Analyzing trace with hash -543279502, now seen corresponding path program 3 times [2018-12-03 18:10:45,401 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:45,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:45,402 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:45,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:45,402 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:45,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:45,467 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 18:10:45,468 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:45,468 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:45,468 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:45,468 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:45,469 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:45,469 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:10:45,480 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:10:45,480 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:10:45,507 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:10:45,507 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:45,509 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:45,514 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 18:10:45,514 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:45,696 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 18:10:45,716 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:45,717 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-12-03 18:10:45,717 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:45,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-03 18:10:45,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-03 18:10:45,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-03 18:10:45,718 INFO L87 Difference]: Start difference. First operand 15 states and 20 transitions. Second operand 6 states. [2018-12-03 18:10:45,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:45,756 INFO L93 Difference]: Finished difference Result 24 states and 34 transitions. [2018-12-03 18:10:45,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 18:10:45,757 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2018-12-03 18:10:45,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:45,757 INFO L225 Difference]: With dead ends: 24 [2018-12-03 18:10:45,757 INFO L226 Difference]: Without dead ends: 17 [2018-12-03 18:10:45,758 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 18:10:45,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-12-03 18:10:45,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-12-03 18:10:45,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-03 18:10:45,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 22 transitions. [2018-12-03 18:10:45,763 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 22 transitions. Word has length 14 [2018-12-03 18:10:45,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:45,763 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 22 transitions. [2018-12-03 18:10:45,763 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-03 18:10:45,763 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 22 transitions. [2018-12-03 18:10:45,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 18:10:45,764 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:45,764 INFO L402 BasicCegarLoop]: trace histogram [6, 4, 3, 1, 1, 1] [2018-12-03 18:10:45,764 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:45,765 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:45,765 INFO L82 PathProgramCache]: Analyzing trace with hash -9895188, now seen corresponding path program 4 times [2018-12-03 18:10:45,765 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:45,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:45,766 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:45,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:45,766 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:45,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:45,839 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 18:10:45,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:45,840 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:45,840 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:45,840 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:45,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:45,840 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:10:45,850 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:45,851 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:10:45,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:45,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:45,866 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 18:10:45,867 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:46,300 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 18:10:46,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:46,323 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-12-03 18:10:46,324 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:46,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 18:10:46,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 18:10:46,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-12-03 18:10:46,325 INFO L87 Difference]: Start difference. First operand 17 states and 22 transitions. Second operand 7 states. [2018-12-03 18:10:46,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:46,363 INFO L93 Difference]: Finished difference Result 26 states and 36 transitions. [2018-12-03 18:10:46,363 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 18:10:46,363 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2018-12-03 18:10:46,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:46,364 INFO L225 Difference]: With dead ends: 26 [2018-12-03 18:10:46,364 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 18:10:46,365 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 18:10:46,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 18:10:46,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-12-03 18:10:46,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 18:10:46,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2018-12-03 18:10:46,370 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 16 [2018-12-03 18:10:46,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:46,370 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2018-12-03 18:10:46,370 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 18:10:46,371 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2018-12-03 18:10:46,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 18:10:46,371 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:46,371 INFO L402 BasicCegarLoop]: trace histogram [7, 5, 3, 1, 1, 1] [2018-12-03 18:10:46,372 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:46,372 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:46,372 INFO L82 PathProgramCache]: Analyzing trace with hash 1471322342, now seen corresponding path program 5 times [2018-12-03 18:10:46,372 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:46,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:46,373 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:46,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:46,373 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:46,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:46,497 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 18:10:46,498 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:46,498 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:46,498 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:46,499 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:46,499 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:46,499 INFO 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 18:10:46,514 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:10:46,514 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:10:46,567 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-12-03 18:10:46,567 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:46,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:46,640 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 18:10:46,641 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:46,684 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 18:10:46,704 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 18:10:46,704 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [7] total 14 [2018-12-03 18:10:46,705 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 18:10:46,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 18:10:46,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 18:10:46,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:10:46,707 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand 5 states. [2018-12-03 18:10:46,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:46,742 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2018-12-03 18:10:46,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 18:10:46,743 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2018-12-03 18:10:46,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:46,744 INFO L225 Difference]: With dead ends: 33 [2018-12-03 18:10:46,744 INFO L226 Difference]: Without dead ends: 26 [2018-12-03 18:10:46,745 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:10:46,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-12-03 18:10:46,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2018-12-03 18:10:46,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 18:10:46,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2018-12-03 18:10:46,752 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 18 [2018-12-03 18:10:46,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:46,752 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2018-12-03 18:10:46,752 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 18:10:46,752 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2018-12-03 18:10:46,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 18:10:46,753 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:46,753 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 2, 1, 1, 1] [2018-12-03 18:10:46,753 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:46,754 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:46,754 INFO L82 PathProgramCache]: Analyzing trace with hash 1471381924, now seen corresponding path program 6 times [2018-12-03 18:10:46,754 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:46,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:46,755 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:46,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:46,756 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:46,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:46,874 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 18:10:46,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:46,875 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:46,875 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:46,875 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:46,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:46,876 INFO 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 18:10:46,886 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:10:46,886 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:10:46,898 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:10:46,898 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:46,901 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:46,907 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 18:10:46,908 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:47,100 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 18:10:47,120 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:47,120 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-12-03 18:10:47,120 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:47,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 18:10:47,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 18:10:47,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:10:47,121 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand 8 states. [2018-12-03 18:10:47,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:47,186 INFO L93 Difference]: Finished difference Result 40 states and 54 transitions. [2018-12-03 18:10:47,186 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 18:10:47,186 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2018-12-03 18:10:47,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:47,187 INFO L225 Difference]: With dead ends: 40 [2018-12-03 18:10:47,187 INFO L226 Difference]: Without dead ends: 27 [2018-12-03 18:10:47,188 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:10:47,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-03 18:10:47,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-03 18:10:47,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 18:10:47,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2018-12-03 18:10:47,194 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 18 [2018-12-03 18:10:47,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:47,194 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2018-12-03 18:10:47,194 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 18:10:47,195 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2018-12-03 18:10:47,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 18:10:47,195 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:47,195 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 2, 1, 1, 1] [2018-12-03 18:10:47,196 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:47,196 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:47,196 INFO L82 PathProgramCache]: Analyzing trace with hash -1007714018, now seen corresponding path program 7 times [2018-12-03 18:10:47,196 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:47,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:47,197 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:47,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:47,198 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:47,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:47,417 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 18:10:47,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:47,417 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:47,417 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:47,418 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:47,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:47,418 INFO 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 18:10:47,427 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:47,427 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:10:47,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:47,441 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:47,448 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 18:10:47,448 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:47,689 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 18:10:47,708 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:47,709 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-12-03 18:10:47,709 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:47,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 18:10:47,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 18:10:47,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-12-03 18:10:47,710 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand 9 states. [2018-12-03 18:10:47,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:47,735 INFO L93 Difference]: Finished difference Result 42 states and 56 transitions. [2018-12-03 18:10:47,737 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 18:10:47,737 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 20 [2018-12-03 18:10:47,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:47,738 INFO L225 Difference]: With dead ends: 42 [2018-12-03 18:10:47,738 INFO L226 Difference]: Without dead ends: 29 [2018-12-03 18:10:47,739 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-12-03 18:10:47,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-12-03 18:10:47,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-12-03 18:10:47,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-12-03 18:10:47,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2018-12-03 18:10:47,745 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 20 [2018-12-03 18:10:47,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:47,745 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2018-12-03 18:10:47,745 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 18:10:47,745 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2018-12-03 18:10:47,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-12-03 18:10:47,746 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:47,746 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 2, 1, 1, 1] [2018-12-03 18:10:47,747 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:47,747 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:47,747 INFO L82 PathProgramCache]: Analyzing trace with hash 287935000, now seen corresponding path program 8 times [2018-12-03 18:10:47,747 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:47,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:47,749 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:47,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:47,749 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:47,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:47,852 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 18:10:47,852 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:47,852 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:47,853 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:47,853 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:47,853 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:47,853 INFO 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 18:10:47,864 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:10:47,864 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:10:47,876 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-12-03 18:10:47,877 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:47,879 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:47,948 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 18:10:47,948 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:48,059 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 18:10:48,087 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:48,088 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5, 5] total 16 [2018-12-03 18:10:48,088 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:48,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 18:10:48,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 18:10:48,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2018-12-03 18:10:48,093 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand 13 states. [2018-12-03 18:10:48,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:48,366 INFO L93 Difference]: Finished difference Result 52 states and 69 transitions. [2018-12-03 18:10:48,367 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 18:10:48,368 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 22 [2018-12-03 18:10:48,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:48,368 INFO L225 Difference]: With dead ends: 52 [2018-12-03 18:10:48,368 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 18:10:48,369 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 18:10:48,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 18:10:48,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2018-12-03 18:10:48,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 18:10:48,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2018-12-03 18:10:48,376 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 22 [2018-12-03 18:10:48,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:48,377 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2018-12-03 18:10:48,377 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 18:10:48,377 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2018-12-03 18:10:48,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 18:10:48,378 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:48,378 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1] [2018-12-03 18:10:48,378 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:48,378 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:48,379 INFO L82 PathProgramCache]: Analyzing trace with hash -133874480, now seen corresponding path program 9 times [2018-12-03 18:10:48,379 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:48,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:48,380 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:48,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:48,380 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:48,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:48,508 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 18:10:48,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:48,508 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:48,509 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:48,509 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:48,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:48,509 INFO 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 18:10:48,519 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:10:48,520 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:10:48,532 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:10:48,533 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:48,535 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:48,543 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 18:10:48,543 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:48,740 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 18:10:48,761 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:48,761 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-12-03 18:10:48,761 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:48,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 18:10:48,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 18:10:48,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-12-03 18:10:48,763 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 11 states. [2018-12-03 18:10:48,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:48,851 INFO L93 Difference]: Finished difference Result 58 states and 76 transitions. [2018-12-03 18:10:48,859 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 18:10:48,859 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 24 [2018-12-03 18:10:48,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:48,860 INFO L225 Difference]: With dead ends: 58 [2018-12-03 18:10:48,860 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 18:10:48,861 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-12-03 18:10:48,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 18:10:48,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-12-03 18:10:48,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 18:10:48,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 48 transitions. [2018-12-03 18:10:48,872 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 48 transitions. Word has length 24 [2018-12-03 18:10:48,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:48,873 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 48 transitions. [2018-12-03 18:10:48,873 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 18:10:48,873 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 48 transitions. [2018-12-03 18:10:48,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 18:10:48,874 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:48,874 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1] [2018-12-03 18:10:48,874 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:48,875 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:48,875 INFO L82 PathProgramCache]: Analyzing trace with hash -1765918518, now seen corresponding path program 10 times [2018-12-03 18:10:48,875 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:48,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:48,876 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:48,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:48,879 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:48,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:49,031 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 18:10:49,032 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:49,032 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:49,032 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:49,033 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:49,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:49,033 INFO 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 18:10:49,049 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:49,049 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:10:49,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:49,067 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:49,075 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 18:10:49,075 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:49,351 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 18:10:49,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:49,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-12-03 18:10:49,371 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:49,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 18:10:49,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 18:10:49,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-12-03 18:10:49,373 INFO L87 Difference]: Start difference. First operand 39 states and 48 transitions. Second operand 12 states. [2018-12-03 18:10:49,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:49,452 INFO L93 Difference]: Finished difference Result 60 states and 78 transitions. [2018-12-03 18:10:49,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 18:10:49,453 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 26 [2018-12-03 18:10:49,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:49,453 INFO L225 Difference]: With dead ends: 60 [2018-12-03 18:10:49,453 INFO L226 Difference]: Without dead ends: 41 [2018-12-03 18:10:49,454 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 18:10:49,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-12-03 18:10:49,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-12-03 18:10:49,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-12-03 18:10:49,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 50 transitions. [2018-12-03 18:10:49,463 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 50 transitions. Word has length 26 [2018-12-03 18:10:49,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:49,463 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 50 transitions. [2018-12-03 18:10:49,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 18:10:49,464 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 50 transitions. [2018-12-03 18:10:49,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-12-03 18:10:49,465 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:49,465 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1] [2018-12-03 18:10:49,465 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:49,465 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:49,465 INFO L82 PathProgramCache]: Analyzing trace with hash 1797791300, now seen corresponding path program 11 times [2018-12-03 18:10:49,466 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:49,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:49,467 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:49,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:49,467 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:49,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:49,608 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 18:10:49,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:49,608 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:49,609 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:49,609 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:49,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:49,609 INFO 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 18:10:49,621 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:10:49,621 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:10:49,638 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 18:10:49,638 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:49,641 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:49,698 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 18:10:49,699 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:49,954 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 18:10:49,974 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:49,974 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 5, 5] total 18 [2018-12-03 18:10:49,975 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:49,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 18:10:49,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 18:10:49,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-12-03 18:10:49,976 INFO L87 Difference]: Start difference. First operand 41 states and 50 transitions. Second operand 14 states. [2018-12-03 18:10:50,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:50,144 INFO L93 Difference]: Finished difference Result 110 states and 184 transitions. [2018-12-03 18:10:50,145 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 18:10:50,145 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 28 [2018-12-03 18:10:50,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:50,146 INFO L225 Difference]: With dead ends: 110 [2018-12-03 18:10:50,146 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 18:10:50,147 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-12-03 18:10:50,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 18:10:50,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-12-03 18:10:50,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-12-03 18:10:50,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 108 transitions. [2018-12-03 18:10:50,159 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 108 transitions. Word has length 28 [2018-12-03 18:10:50,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:50,160 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 108 transitions. [2018-12-03 18:10:50,160 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 18:10:50,160 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 108 transitions. [2018-12-03 18:10:50,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-12-03 18:10:50,162 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:50,162 INFO L402 BasicCegarLoop]: trace histogram [21, 18, 4, 1, 1, 1] [2018-12-03 18:10:50,162 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:50,162 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:50,163 INFO L82 PathProgramCache]: Analyzing trace with hash -1185393580, now seen corresponding path program 12 times [2018-12-03 18:10:50,163 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:50,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:50,164 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:50,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:50,164 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:50,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:50,402 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 18:10:50,402 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:50,402 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:50,403 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:50,403 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:50,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:50,403 INFO 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 18:10:50,413 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:10:50,413 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:10:50,450 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:10:50,450 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:50,453 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:50,468 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 18:10:50,468 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:50,782 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 18:10:50,803 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:50,803 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-12-03 18:10:50,803 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:50,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 18:10:50,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 18:10:50,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-12-03 18:10:50,805 INFO L87 Difference]: Start difference. First operand 91 states and 108 transitions. Second operand 14 states. [2018-12-03 18:10:50,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:50,885 INFO L93 Difference]: Finished difference Result 160 states and 194 transitions. [2018-12-03 18:10:50,887 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 18:10:50,887 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 46 [2018-12-03 18:10:50,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:50,889 INFO L225 Difference]: With dead ends: 160 [2018-12-03 18:10:50,889 INFO L226 Difference]: Without dead ends: 93 [2018-12-03 18:10:50,890 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-12-03 18:10:50,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-12-03 18:10:50,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-12-03 18:10:50,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-03 18:10:50,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 110 transitions. [2018-12-03 18:10:50,917 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 110 transitions. Word has length 46 [2018-12-03 18:10:50,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:50,917 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 110 transitions. [2018-12-03 18:10:50,918 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 18:10:50,918 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 110 transitions. [2018-12-03 18:10:50,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 18:10:50,921 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:50,921 INFO L402 BasicCegarLoop]: trace histogram [22, 19, 4, 1, 1, 1] [2018-12-03 18:10:50,921 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:50,922 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:50,922 INFO L82 PathProgramCache]: Analyzing trace with hash 331528398, now seen corresponding path program 13 times [2018-12-03 18:10:50,922 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:50,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:50,923 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:50,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:50,924 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:50,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:51,177 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 18:10:51,177 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:51,177 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:51,177 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:51,178 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:51,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:51,178 INFO 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 18:10:51,188 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:51,188 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:10:51,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:51,224 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:51,236 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 18:10:51,236 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:51,560 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 18:10:51,579 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:51,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-12-03 18:10:51,580 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:51,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 18:10:51,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 18:10:51,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-12-03 18:10:51,581 INFO L87 Difference]: Start difference. First operand 93 states and 110 transitions. Second operand 15 states. [2018-12-03 18:10:51,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:51,657 INFO L93 Difference]: Finished difference Result 162 states and 196 transitions. [2018-12-03 18:10:51,658 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 18:10:51,658 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 48 [2018-12-03 18:10:51,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:51,659 INFO L225 Difference]: With dead ends: 162 [2018-12-03 18:10:51,659 INFO L226 Difference]: Without dead ends: 95 [2018-12-03 18:10:51,660 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-12-03 18:10:51,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-12-03 18:10:51,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2018-12-03 18:10:51,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-12-03 18:10:51,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 112 transitions. [2018-12-03 18:10:51,670 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 112 transitions. Word has length 48 [2018-12-03 18:10:51,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:51,670 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 112 transitions. [2018-12-03 18:10:51,670 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 18:10:51,671 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 112 transitions. [2018-12-03 18:10:51,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 18:10:51,672 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:51,672 INFO L402 BasicCegarLoop]: trace histogram [23, 20, 4, 1, 1, 1] [2018-12-03 18:10:51,672 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:51,672 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:51,672 INFO L82 PathProgramCache]: Analyzing trace with hash 2099635912, now seen corresponding path program 14 times [2018-12-03 18:10:51,672 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:51,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:51,674 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:51,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:51,674 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:51,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:52,088 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 18:10:52,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:52,089 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:52,089 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:52,089 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:52,089 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:52,089 INFO 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 18:10:52,104 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:10:52,104 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:10:52,209 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-03 18:10:52,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:52,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:52,369 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 18:10:52,369 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:52,460 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 18:10:52,479 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:52,479 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6, 6] total 24 [2018-12-03 18:10:52,479 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:52,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 18:10:52,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 18:10:52,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=388, Unknown=0, NotChecked=0, Total=552 [2018-12-03 18:10:52,480 INFO L87 Difference]: Start difference. First operand 95 states and 112 transitions. Second operand 20 states. [2018-12-03 18:10:52,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:52,908 INFO L93 Difference]: Finished difference Result 189 states and 233 transitions. [2018-12-03 18:10:52,909 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 18:10:52,909 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 50 [2018-12-03 18:10:52,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:52,911 INFO L225 Difference]: With dead ends: 189 [2018-12-03 18:10:52,911 INFO L226 Difference]: Without dead ends: 122 [2018-12-03 18:10:52,912 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=539, Invalid=1101, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 18:10:52,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2018-12-03 18:10:52,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 119. [2018-12-03 18:10:52,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-12-03 18:10:52,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 138 transitions. [2018-12-03 18:10:52,931 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 138 transitions. Word has length 50 [2018-12-03 18:10:52,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:52,932 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 138 transitions. [2018-12-03 18:10:52,932 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 18:10:52,932 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 138 transitions. [2018-12-03 18:10:52,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-12-03 18:10:52,933 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:52,933 INFO L402 BasicCegarLoop]: trace histogram [24, 22, 3, 1, 1, 1] [2018-12-03 18:10:52,933 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:52,938 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:52,938 INFO L82 PathProgramCache]: Analyzing trace with hash -16269184, now seen corresponding path program 15 times [2018-12-03 18:10:52,938 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:52,939 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:52,939 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:52,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:52,940 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:52,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:53,281 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 18:10:53,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:53,282 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:53,282 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:53,282 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:53,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:53,282 INFO 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 18:10:53,291 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:10:53,291 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:10:53,312 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:10:53,312 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:53,315 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:53,327 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 18:10:53,327 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:53,715 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 18:10:53,735 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:53,735 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-12-03 18:10:53,735 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:53,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 18:10:53,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 18:10:53,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-12-03 18:10:53,737 INFO L87 Difference]: Start difference. First operand 119 states and 138 transitions. Second operand 17 states. [2018-12-03 18:10:53,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:53,810 INFO L93 Difference]: Finished difference Result 210 states and 248 transitions. [2018-12-03 18:10:53,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 18:10:53,810 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 52 [2018-12-03 18:10:53,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:53,813 INFO L225 Difference]: With dead ends: 210 [2018-12-03 18:10:53,813 INFO L226 Difference]: Without dead ends: 121 [2018-12-03 18:10:53,814 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-12-03 18:10:53,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-12-03 18:10:53,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2018-12-03 18:10:53,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2018-12-03 18:10:53,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 140 transitions. [2018-12-03 18:10:53,825 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 140 transitions. Word has length 52 [2018-12-03 18:10:53,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:53,825 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 140 transitions. [2018-12-03 18:10:53,825 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 18:10:53,825 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 140 transitions. [2018-12-03 18:10:53,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 18:10:53,826 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:53,826 INFO L402 BasicCegarLoop]: trace histogram [25, 23, 3, 1, 1, 1] [2018-12-03 18:10:53,827 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:53,827 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:53,827 INFO L82 PathProgramCache]: Analyzing trace with hash -2033229446, now seen corresponding path program 16 times [2018-12-03 18:10:53,827 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:53,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:53,828 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:53,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:53,828 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:53,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:54,183 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 18:10:54,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:54,184 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:54,184 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:54,184 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:54,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:54,184 INFO 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 18:10:54,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:54,196 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:10:54,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:54,224 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:54,244 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 18:10:54,244 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:54,780 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 18:10:54,814 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:54,815 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-12-03 18:10:54,815 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:54,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 18:10:54,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 18:10:54,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 18:10:54,817 INFO L87 Difference]: Start difference. First operand 121 states and 140 transitions. Second operand 18 states. [2018-12-03 18:10:55,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:55,065 INFO L93 Difference]: Finished difference Result 212 states and 250 transitions. [2018-12-03 18:10:55,065 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 18:10:55,065 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 54 [2018-12-03 18:10:55,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:55,066 INFO L225 Difference]: With dead ends: 212 [2018-12-03 18:10:55,066 INFO L226 Difference]: Without dead ends: 123 [2018-12-03 18:10:55,067 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 18:10:55,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-12-03 18:10:55,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2018-12-03 18:10:55,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-12-03 18:10:55,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 142 transitions. [2018-12-03 18:10:55,075 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 142 transitions. Word has length 54 [2018-12-03 18:10:55,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:55,075 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 142 transitions. [2018-12-03 18:10:55,075 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 18:10:55,075 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 142 transitions. [2018-12-03 18:10:55,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-12-03 18:10:55,076 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:55,076 INFO L402 BasicCegarLoop]: trace histogram [26, 24, 3, 1, 1, 1] [2018-12-03 18:10:55,076 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:55,077 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:55,077 INFO L82 PathProgramCache]: Analyzing trace with hash 993176564, now seen corresponding path program 17 times [2018-12-03 18:10:55,077 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:55,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:55,078 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:55,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:55,078 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:55,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:55,295 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 18:10:55,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:55,296 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:55,296 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:55,296 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:55,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:55,296 INFO 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 18:10:55,305 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:10:55,306 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:10:55,330 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-12-03 18:10:55,330 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:55,332 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:55,450 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 18:10:55,451 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:55,539 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 18:10:55,568 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:55,569 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 7, 7] total 29 [2018-12-03 18:10:55,569 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:55,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 18:10:55,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 18:10:55,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=576, Unknown=0, NotChecked=0, Total=812 [2018-12-03 18:10:55,570 INFO L87 Difference]: Start difference. First operand 123 states and 142 transitions. Second operand 24 states. [2018-12-03 18:10:56,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:56,395 INFO L93 Difference]: Finished difference Result 240 states and 287 transitions. [2018-12-03 18:10:56,396 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-03 18:10:56,396 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 56 [2018-12-03 18:10:56,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:56,397 INFO L225 Difference]: With dead ends: 240 [2018-12-03 18:10:56,397 INFO L226 Difference]: Without dead ends: 151 [2018-12-03 18:10:56,398 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 425 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=793, Invalid=1657, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:10:56,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-12-03 18:10:56,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 147. [2018-12-03 18:10:56,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-12-03 18:10:56,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 168 transitions. [2018-12-03 18:10:56,406 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 168 transitions. Word has length 56 [2018-12-03 18:10:56,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:56,406 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 168 transitions. [2018-12-03 18:10:56,406 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 18:10:56,406 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 168 transitions. [2018-12-03 18:10:56,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-12-03 18:10:56,407 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:56,407 INFO L402 BasicCegarLoop]: trace histogram [27, 25, 3, 1, 1, 1] [2018-12-03 18:10:56,407 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:56,408 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:56,408 INFO L82 PathProgramCache]: Analyzing trace with hash 464468334, now seen corresponding path program 18 times [2018-12-03 18:10:56,408 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:56,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:56,409 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:56,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:56,409 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:56,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:56,762 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 18:10:56,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:56,763 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:56,763 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:56,763 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:56,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:56,763 INFO 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 18:10:56,771 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:10:56,772 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:10:56,798 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:10:56,799 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:56,801 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:56,815 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 18:10:56,815 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:57,895 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 18:10:57,914 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:57,914 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-12-03 18:10:57,915 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:57,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 18:10:57,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 18:10:57,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 18:10:57,916 INFO L87 Difference]: Start difference. First operand 147 states and 168 transitions. Second operand 20 states. [2018-12-03 18:10:57,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:57,987 INFO L93 Difference]: Finished difference Result 260 states and 302 transitions. [2018-12-03 18:10:57,988 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 18:10:57,988 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 58 [2018-12-03 18:10:57,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:57,990 INFO L225 Difference]: With dead ends: 260 [2018-12-03 18:10:57,990 INFO L226 Difference]: Without dead ends: 149 [2018-12-03 18:10:57,992 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 18:10:57,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-12-03 18:10:57,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2018-12-03 18:10:57,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-12-03 18:10:58,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 170 transitions. [2018-12-03 18:10:58,000 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 170 transitions. Word has length 58 [2018-12-03 18:10:58,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:58,000 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 170 transitions. [2018-12-03 18:10:58,000 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 18:10:58,000 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 170 transitions. [2018-12-03 18:10:58,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-12-03 18:10:58,001 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:58,001 INFO L402 BasicCegarLoop]: trace histogram [28, 26, 3, 1, 1, 1] [2018-12-03 18:10:58,002 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:58,002 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:58,002 INFO L82 PathProgramCache]: Analyzing trace with hash 1357544, now seen corresponding path program 19 times [2018-12-03 18:10:58,002 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:58,003 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:58,003 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:58,003 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:58,004 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:58,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:58,263 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 18:10:58,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:58,264 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:58,264 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:58,264 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:58,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:58,264 INFO 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 18:10:58,274 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:58,274 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:10:58,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:58,299 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:58,308 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 18:10:58,308 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:58,848 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 18:10:58,867 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:58,868 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-12-03 18:10:58,868 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:58,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 18:10:58,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 18:10:58,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-12-03 18:10:58,869 INFO L87 Difference]: Start difference. First operand 149 states and 170 transitions. Second operand 21 states. [2018-12-03 18:10:58,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:58,931 INFO L93 Difference]: Finished difference Result 262 states and 304 transitions. [2018-12-03 18:10:58,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 18:10:58,934 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2018-12-03 18:10:58,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:58,936 INFO L225 Difference]: With dead ends: 262 [2018-12-03 18:10:58,936 INFO L226 Difference]: Without dead ends: 151 [2018-12-03 18:10:58,937 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-12-03 18:10:58,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-12-03 18:10:58,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-12-03 18:10:58,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-12-03 18:10:58,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 172 transitions. [2018-12-03 18:10:58,946 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 172 transitions. Word has length 60 [2018-12-03 18:10:58,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:58,946 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 172 transitions. [2018-12-03 18:10:58,946 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 18:10:58,946 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 172 transitions. [2018-12-03 18:10:58,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 18:10:58,947 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:58,947 INFO L402 BasicCegarLoop]: trace histogram [29, 27, 3, 1, 1, 1] [2018-12-03 18:10:58,947 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:58,948 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:58,948 INFO L82 PathProgramCache]: Analyzing trace with hash 1628487138, now seen corresponding path program 20 times [2018-12-03 18:10:58,948 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:58,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:58,949 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:58,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:58,949 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:58,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:59,201 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 18:10:59,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:59,202 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:59,202 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:59,202 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:59,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:59,202 INFO 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 18:10:59,212 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:10:59,212 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:10:59,231 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-12-03 18:10:59,231 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:59,233 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:59,317 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 18:10:59,317 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:59,414 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 18:10:59,433 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:59,433 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 8, 8] total 34 [2018-12-03 18:10:59,433 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:59,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-12-03 18:10:59,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-12-03 18:10:59,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 18:10:59,435 INFO L87 Difference]: Start difference. First operand 151 states and 172 transitions. Second operand 28 states. [2018-12-03 18:11:00,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:00,148 INFO L93 Difference]: Finished difference Result 291 states and 341 transitions. [2018-12-03 18:11:00,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 18:11:00,148 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 62 [2018-12-03 18:11:00,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:00,149 INFO L225 Difference]: With dead ends: 291 [2018-12-03 18:11:00,150 INFO L226 Difference]: Without dead ends: 180 [2018-12-03 18:11:00,152 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 18:11:00,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-12-03 18:11:00,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 175. [2018-12-03 18:11:00,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-12-03 18:11:00,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 198 transitions. [2018-12-03 18:11:00,159 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 198 transitions. Word has length 62 [2018-12-03 18:11:00,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:00,160 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 198 transitions. [2018-12-03 18:11:00,160 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-12-03 18:11:00,160 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 198 transitions. [2018-12-03 18:11:00,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-12-03 18:11:00,161 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:00,161 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 2, 1, 1, 1] [2018-12-03 18:11:00,161 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:00,161 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:00,161 INFO L82 PathProgramCache]: Analyzing trace with hash -1711843558, now seen corresponding path program 21 times [2018-12-03 18:11:00,162 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:00,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:00,162 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:00,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:00,163 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:00,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:00,594 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 18:11:00,594 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:00,595 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:00,595 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:00,595 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:00,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:00,595 INFO 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 18:11:00,604 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:11:00,604 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:11:00,630 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:11:00,631 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:00,633 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:00,641 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 18:11:00,641 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:01,188 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 18:11:01,208 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:01,208 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-12-03 18:11:01,208 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:01,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 18:11:01,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 18:11:01,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 18:11:01,210 INFO L87 Difference]: Start difference. First operand 175 states and 198 transitions. Second operand 23 states. [2018-12-03 18:11:01,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:01,272 INFO L93 Difference]: Finished difference Result 310 states and 356 transitions. [2018-12-03 18:11:01,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 18:11:01,274 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 64 [2018-12-03 18:11:01,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:01,275 INFO L225 Difference]: With dead ends: 310 [2018-12-03 18:11:01,276 INFO L226 Difference]: Without dead ends: 177 [2018-12-03 18:11:01,277 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 18:11:01,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-12-03 18:11:01,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2018-12-03 18:11:01,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-12-03 18:11:01,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 200 transitions. [2018-12-03 18:11:01,286 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 200 transitions. Word has length 64 [2018-12-03 18:11:01,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:01,286 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 200 transitions. [2018-12-03 18:11:01,286 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 18:11:01,287 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 200 transitions. [2018-12-03 18:11:01,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-12-03 18:11:01,287 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:01,288 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 2, 1, 1, 1] [2018-12-03 18:11:01,288 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:01,288 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:01,288 INFO L82 PathProgramCache]: Analyzing trace with hash 2135118100, now seen corresponding path program 22 times [2018-12-03 18:11:01,288 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:01,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:01,289 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:01,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:01,289 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:01,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:01,678 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 18:11:01,679 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:01,679 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:01,679 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:01,679 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:01,679 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:01,680 INFO 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 18:11:01,698 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:01,699 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:11:01,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:01,724 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:01,734 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 18:11:01,735 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:02,439 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 18:11:02,458 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:02,458 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-12-03 18:11:02,458 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:02,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 18:11:02,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 18:11:02,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 18:11:02,459 INFO L87 Difference]: Start difference. First operand 177 states and 200 transitions. Second operand 24 states. [2018-12-03 18:11:02,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:02,564 INFO L93 Difference]: Finished difference Result 312 states and 358 transitions. [2018-12-03 18:11:02,564 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 18:11:02,564 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 66 [2018-12-03 18:11:02,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:02,565 INFO L225 Difference]: With dead ends: 312 [2018-12-03 18:11:02,566 INFO L226 Difference]: Without dead ends: 179 [2018-12-03 18:11:02,567 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 18:11:02,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2018-12-03 18:11:02,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2018-12-03 18:11:02,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-12-03 18:11:02,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 202 transitions. [2018-12-03 18:11:02,578 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 202 transitions. Word has length 66 [2018-12-03 18:11:02,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:02,578 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 202 transitions. [2018-12-03 18:11:02,579 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 18:11:02,579 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 202 transitions. [2018-12-03 18:11:02,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-12-03 18:11:02,579 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:02,579 INFO L402 BasicCegarLoop]: trace histogram [32, 31, 2, 1, 1, 1] [2018-12-03 18:11:02,580 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:02,580 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:02,580 INFO L82 PathProgramCache]: Analyzing trace with hash 1098429582, now seen corresponding path program 23 times [2018-12-03 18:11:02,580 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:02,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:02,581 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:02,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:02,581 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:02,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:03,040 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 18:11:03,040 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:03,040 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:03,040 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:03,040 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:03,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:03,041 INFO 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 18:11:03,059 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:11:03,060 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:11:03,092 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 18:11:03,092 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:03,094 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:03,223 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 18:11:03,223 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:03,332 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 18:11:03,351 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:03,351 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 9, 9] total 39 [2018-12-03 18:11:03,352 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:03,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 18:11:03,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 18:11:03,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1063, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 18:11:03,353 INFO L87 Difference]: Start difference. First operand 179 states and 202 transitions. Second operand 32 states. [2018-12-03 18:11:04,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:04,109 INFO L93 Difference]: Finished difference Result 342 states and 395 transitions. [2018-12-03 18:11:04,120 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-12-03 18:11:04,120 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2018-12-03 18:11:04,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:04,121 INFO L225 Difference]: With dead ends: 342 [2018-12-03 18:11:04,122 INFO L226 Difference]: Without dead ends: 209 [2018-12-03 18:11:04,124 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 18:11:04,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2018-12-03 18:11:04,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 203. [2018-12-03 18:11:04,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203 states. [2018-12-03 18:11:04,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 228 transitions. [2018-12-03 18:11:04,135 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 228 transitions. Word has length 68 [2018-12-03 18:11:04,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:04,135 INFO L480 AbstractCegarLoop]: Abstraction has 203 states and 228 transitions. [2018-12-03 18:11:04,135 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 18:11:04,135 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 228 transitions. [2018-12-03 18:11:04,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-12-03 18:11:04,136 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:04,137 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 2, 1, 1, 1] [2018-12-03 18:11:04,137 INFO L423 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:04,137 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:04,137 INFO L82 PathProgramCache]: Analyzing trace with hash 1689496072, now seen corresponding path program 24 times [2018-12-03 18:11:04,137 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:04,138 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:04,138 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:04,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:04,139 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:04,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:05,466 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 18:11:05,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:05,467 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:05,467 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:05,467 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:05,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:05,467 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:11:05,477 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:11:05,478 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:11:05,505 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:11:05,505 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:05,507 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:05,517 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 18:11:05,517 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:06,160 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 18:11:06,179 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:06,179 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-12-03 18:11:06,180 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:06,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 18:11:06,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 18:11:06,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:11:06,181 INFO L87 Difference]: Start difference. First operand 203 states and 228 transitions. Second operand 26 states. [2018-12-03 18:11:06,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:06,240 INFO L93 Difference]: Finished difference Result 360 states and 410 transitions. [2018-12-03 18:11:06,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 18:11:06,240 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 70 [2018-12-03 18:11:06,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:06,242 INFO L225 Difference]: With dead ends: 360 [2018-12-03 18:11:06,242 INFO L226 Difference]: Without dead ends: 205 [2018-12-03 18:11:06,244 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:11:06,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-12-03 18:11:06,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2018-12-03 18:11:06,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-12-03 18:11:06,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 230 transitions. [2018-12-03 18:11:06,252 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 230 transitions. Word has length 70 [2018-12-03 18:11:06,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:06,252 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 230 transitions. [2018-12-03 18:11:06,252 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 18:11:06,252 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 230 transitions. [2018-12-03 18:11:06,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 18:11:06,253 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:06,253 INFO L402 BasicCegarLoop]: trace histogram [34, 33, 2, 1, 1, 1] [2018-12-03 18:11:06,253 INFO L423 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:06,253 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:06,253 INFO L82 PathProgramCache]: Analyzing trace with hash 2117517442, now seen corresponding path program 25 times [2018-12-03 18:11:06,254 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:06,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:06,254 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:06,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:06,255 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:06,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:06,883 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 18:11:06,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:06,883 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:06,883 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:06,883 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:06,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:06,884 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:11:06,892 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:06,892 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:11:06,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:06,930 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:06,942 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 18:11:06,942 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:07,863 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 18:11:07,881 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:07,882 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-12-03 18:11:07,882 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:07,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 18:11:07,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 18:11:07,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-12-03 18:11:07,883 INFO L87 Difference]: Start difference. First operand 205 states and 230 transitions. Second operand 27 states. [2018-12-03 18:11:07,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:07,986 INFO L93 Difference]: Finished difference Result 362 states and 412 transitions. [2018-12-03 18:11:07,987 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 18:11:07,987 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 72 [2018-12-03 18:11:07,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:07,988 INFO L225 Difference]: With dead ends: 362 [2018-12-03 18:11:07,989 INFO L226 Difference]: Without dead ends: 207 [2018-12-03 18:11:07,990 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-12-03 18:11:07,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-12-03 18:11:07,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2018-12-03 18:11:08,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-12-03 18:11:08,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 232 transitions. [2018-12-03 18:11:08,001 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 232 transitions. Word has length 72 [2018-12-03 18:11:08,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:08,001 INFO L480 AbstractCegarLoop]: Abstraction has 207 states and 232 transitions. [2018-12-03 18:11:08,001 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 18:11:08,001 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 232 transitions. [2018-12-03 18:11:08,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-12-03 18:11:08,002 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:08,002 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 2, 1, 1, 1] [2018-12-03 18:11:08,002 INFO L423 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:08,003 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:08,003 INFO L82 PathProgramCache]: Analyzing trace with hash 1129193596, now seen corresponding path program 26 times [2018-12-03 18:11:08,003 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:08,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:08,004 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:08,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:08,004 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:08,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:08,459 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 18:11:08,459 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:08,459 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:08,460 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:08,460 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:08,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:08,460 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:11:08,469 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:11:08,469 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:11:08,497 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 18:11:08,497 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:08,499 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:08,624 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 18:11:08,624 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:08,793 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 18:11:08,812 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:08,812 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 10, 10] total 44 [2018-12-03 18:11:08,812 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:08,812 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-12-03 18:11:08,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-12-03 18:11:08,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=1362, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 18:11:08,813 INFO L87 Difference]: Start difference. First operand 207 states and 232 transitions. Second operand 36 states. [2018-12-03 18:11:09,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:09,726 INFO L93 Difference]: Finished difference Result 393 states and 449 transitions. [2018-12-03 18:11:09,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 18:11:09,729 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 74 [2018-12-03 18:11:09,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:09,730 INFO L225 Difference]: With dead ends: 393 [2018-12-03 18:11:09,730 INFO L226 Difference]: Without dead ends: 238 [2018-12-03 18:11:09,733 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1070 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1849, Invalid=4003, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 18:11:09,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2018-12-03 18:11:09,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 231. [2018-12-03 18:11:09,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2018-12-03 18:11:09,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 258 transitions. [2018-12-03 18:11:09,743 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 258 transitions. Word has length 74 [2018-12-03 18:11:09,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:09,744 INFO L480 AbstractCegarLoop]: Abstraction has 231 states and 258 transitions. [2018-12-03 18:11:09,744 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-12-03 18:11:09,744 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 258 transitions. [2018-12-03 18:11:09,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-12-03 18:11:09,745 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:09,745 INFO L402 BasicCegarLoop]: trace histogram [36, 35, 2, 1, 1, 1] [2018-12-03 18:11:09,745 INFO L423 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:09,745 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:09,745 INFO L82 PathProgramCache]: Analyzing trace with hash -328854922, now seen corresponding path program 27 times [2018-12-03 18:11:09,746 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:09,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:09,746 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:09,747 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:09,747 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:09,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:10,801 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 18:11:10,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:10,802 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:10,802 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:10,802 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:10,802 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:10,802 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 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 18:11:10,812 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:11:10,812 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:11:10,843 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:11:10,843 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:10,845 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:10,856 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 18:11:10,856 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:11,629 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 18:11:11,649 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:11,649 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-12-03 18:11:11,649 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:11,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 18:11:11,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 18:11:11,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 18:11:11,651 INFO L87 Difference]: Start difference. First operand 231 states and 258 transitions. Second operand 29 states. [2018-12-03 18:11:11,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:11,765 INFO L93 Difference]: Finished difference Result 410 states and 464 transitions. [2018-12-03 18:11:11,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 18:11:11,765 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 76 [2018-12-03 18:11:11,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:11,767 INFO L225 Difference]: With dead ends: 410 [2018-12-03 18:11:11,767 INFO L226 Difference]: Without dead ends: 233 [2018-12-03 18:11:11,768 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 18:11:11,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2018-12-03 18:11:11,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 233. [2018-12-03 18:11:11,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2018-12-03 18:11:11,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 260 transitions. [2018-12-03 18:11:11,781 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 260 transitions. Word has length 76 [2018-12-03 18:11:11,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:11,781 INFO L480 AbstractCegarLoop]: Abstraction has 233 states and 260 transitions. [2018-12-03 18:11:11,781 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 18:11:11,782 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 260 transitions. [2018-12-03 18:11:11,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-12-03 18:11:11,783 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:11,783 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 2, 1, 1, 1] [2018-12-03 18:11:11,783 INFO L423 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:11,784 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:11,784 INFO L82 PathProgramCache]: Analyzing trace with hash -1770461840, now seen corresponding path program 28 times [2018-12-03 18:11:11,784 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:11,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:11,785 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:11,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:11,785 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:11,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:12,266 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 18:11:12,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:12,267 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:12,267 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:12,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:12,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:12,267 INFO 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 18:11:12,276 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:12,277 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:11:12,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:12,310 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:12,320 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 18:11:12,320 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:13,522 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 18:11:13,541 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:13,541 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-12-03 18:11:13,541 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:13,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-12-03 18:11:13,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-12-03 18:11:13,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 18:11:13,542 INFO L87 Difference]: Start difference. First operand 233 states and 260 transitions. Second operand 30 states. [2018-12-03 18:11:13,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:13,621 INFO L93 Difference]: Finished difference Result 412 states and 466 transitions. [2018-12-03 18:11:13,622 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-03 18:11:13,622 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 78 [2018-12-03 18:11:13,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:13,624 INFO L225 Difference]: With dead ends: 412 [2018-12-03 18:11:13,624 INFO L226 Difference]: Without dead ends: 235 [2018-12-03 18:11:13,625 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 18:11:13,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2018-12-03 18:11:13,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 235. [2018-12-03 18:11:13,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2018-12-03 18:11:13,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 262 transitions. [2018-12-03 18:11:13,635 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 262 transitions. Word has length 78 [2018-12-03 18:11:13,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:13,636 INFO L480 AbstractCegarLoop]: Abstraction has 235 states and 262 transitions. [2018-12-03 18:11:13,636 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-12-03 18:11:13,636 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 262 transitions. [2018-12-03 18:11:13,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-12-03 18:11:13,637 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:13,637 INFO L402 BasicCegarLoop]: trace histogram [38, 37, 2, 1, 1, 1] [2018-12-03 18:11:13,637 INFO L423 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:13,637 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:13,637 INFO L82 PathProgramCache]: Analyzing trace with hash 119726570, now seen corresponding path program 29 times [2018-12-03 18:11:13,638 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:13,638 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:13,638 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:13,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:13,639 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:13,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:14,408 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 18:11:14,409 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:14,409 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:14,409 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:14,409 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:14,409 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:14,410 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:11:14,421 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:11:14,421 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:11:14,451 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 18:11:14,451 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:14,454 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:14,664 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 18:11:14,664 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:14,891 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 18:11:14,910 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:14,911 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 11, 11] total 49 [2018-12-03 18:11:14,911 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:14,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-12-03 18:11:14,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-12-03 18:11:14,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=654, Invalid=1698, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 18:11:14,912 INFO L87 Difference]: Start difference. First operand 235 states and 262 transitions. Second operand 40 states. [2018-12-03 18:11:15,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:15,892 INFO L93 Difference]: Finished difference Result 444 states and 503 transitions. [2018-12-03 18:11:15,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-03 18:11:15,893 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 80 [2018-12-03 18:11:15,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:15,894 INFO L225 Difference]: With dead ends: 444 [2018-12-03 18:11:15,894 INFO L226 Difference]: Without dead ends: 267 [2018-12-03 18:11:15,895 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1349 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2299, Invalid=5011, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 18:11:15,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-12-03 18:11:15,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 259. [2018-12-03 18:11:15,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-12-03 18:11:15,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 288 transitions. [2018-12-03 18:11:15,908 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 288 transitions. Word has length 80 [2018-12-03 18:11:15,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:15,909 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 288 transitions. [2018-12-03 18:11:15,909 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-12-03 18:11:15,909 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 288 transitions. [2018-12-03 18:11:15,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-12-03 18:11:15,910 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:15,910 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 2, 1, 1, 1] [2018-12-03 18:11:15,910 INFO L423 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:15,910 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:15,910 INFO L82 PathProgramCache]: Analyzing trace with hash -123178908, now seen corresponding path program 30 times [2018-12-03 18:11:15,910 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:15,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:15,912 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:15,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:15,912 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:15,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:16,774 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 18:11:16,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:16,774 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:16,775 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:16,775 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:16,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:16,775 INFO 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 18:11:16,784 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:11:16,785 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:11:16,817 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:11:16,817 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:16,819 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:16,834 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 18:11:16,834 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:19,029 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 18:11:19,049 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:19,049 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-12-03 18:11:19,049 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:19,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 18:11:19,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 18:11:19,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 18:11:19,050 INFO L87 Difference]: Start difference. First operand 259 states and 288 transitions. Second operand 32 states. [2018-12-03 18:11:19,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:19,133 INFO L93 Difference]: Finished difference Result 460 states and 518 transitions. [2018-12-03 18:11:19,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-03 18:11:19,133 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 82 [2018-12-03 18:11:19,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:19,134 INFO L225 Difference]: With dead ends: 460 [2018-12-03 18:11:19,134 INFO L226 Difference]: Without dead ends: 261 [2018-12-03 18:11:19,136 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 18:11:19,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2018-12-03 18:11:19,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 261. [2018-12-03 18:11:19,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 261 states. [2018-12-03 18:11:19,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 290 transitions. [2018-12-03 18:11:19,147 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 290 transitions. Word has length 82 [2018-12-03 18:11:19,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:19,148 INFO L480 AbstractCegarLoop]: Abstraction has 261 states and 290 transitions. [2018-12-03 18:11:19,148 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 18:11:19,148 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 290 transitions. [2018-12-03 18:11:19,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-12-03 18:11:19,149 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:19,149 INFO L402 BasicCegarLoop]: trace histogram [40, 39, 2, 1, 1, 1] [2018-12-03 18:11:19,149 INFO L423 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:19,149 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:19,149 INFO L82 PathProgramCache]: Analyzing trace with hash -760504354, now seen corresponding path program 31 times [2018-12-03 18:11:19,149 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:19,150 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:19,150 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:19,150 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:19,151 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:19,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:19,592 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 18:11:19,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:19,593 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:19,593 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:19,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:19,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:19,593 INFO 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 18:11:19,602 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:19,602 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:11:19,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:19,636 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:19,648 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 18:11:19,648 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:20,800 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 18:11:20,819 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:20,820 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-12-03 18:11:20,820 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:20,820 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-12-03 18:11:20,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-12-03 18:11:20,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-12-03 18:11:20,821 INFO L87 Difference]: Start difference. First operand 261 states and 290 transitions. Second operand 33 states. [2018-12-03 18:11:20,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:20,962 INFO L93 Difference]: Finished difference Result 462 states and 520 transitions. [2018-12-03 18:11:20,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 18:11:20,962 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 84 [2018-12-03 18:11:20,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:20,963 INFO L225 Difference]: With dead ends: 462 [2018-12-03 18:11:20,963 INFO L226 Difference]: Without dead ends: 263 [2018-12-03 18:11:20,964 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-12-03 18:11:20,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2018-12-03 18:11:20,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 263. [2018-12-03 18:11:20,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 263 states. [2018-12-03 18:11:20,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 292 transitions. [2018-12-03 18:11:20,976 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 292 transitions. Word has length 84 [2018-12-03 18:11:20,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:20,977 INFO L480 AbstractCegarLoop]: Abstraction has 263 states and 292 transitions. [2018-12-03 18:11:20,977 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-12-03 18:11:20,977 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 292 transitions. [2018-12-03 18:11:20,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 18:11:20,978 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:20,978 INFO L402 BasicCegarLoop]: trace histogram [41, 40, 2, 1, 1, 1] [2018-12-03 18:11:20,978 INFO L423 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:20,978 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:20,978 INFO L82 PathProgramCache]: Analyzing trace with hash 950065368, now seen corresponding path program 32 times [2018-12-03 18:11:20,979 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:20,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:20,979 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:20,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:20,980 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:20,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:21,537 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 18:11:21,537 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:21,537 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:21,537 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:21,537 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:21,537 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:21,537 INFO 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 18:11:21,546 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:11:21,546 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:11:21,575 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 18:11:21,575 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:21,576 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:22,328 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 18:11:22,329 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:22,594 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 18:11:22,618 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:22,618 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 12, 12] total 54 [2018-12-03 18:11:22,618 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:22,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 18:11:22,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 18:11:22,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=791, Invalid=2071, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 18:11:22,620 INFO L87 Difference]: Start difference. First operand 263 states and 292 transitions. Second operand 44 states. [2018-12-03 18:11:24,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:24,042 INFO L93 Difference]: Finished difference Result 495 states and 557 transitions. [2018-12-03 18:11:24,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 18:11:24,042 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 86 [2018-12-03 18:11:24,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:24,043 INFO L225 Difference]: With dead ends: 495 [2018-12-03 18:11:24,043 INFO L226 Difference]: Without dead ends: 296 [2018-12-03 18:11:24,045 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1660 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2798, Invalid=6132, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 18:11:24,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2018-12-03 18:11:24,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 287. [2018-12-03 18:11:24,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2018-12-03 18:11:24,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 318 transitions. [2018-12-03 18:11:24,057 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 318 transitions. Word has length 86 [2018-12-03 18:11:24,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:24,057 INFO L480 AbstractCegarLoop]: Abstraction has 287 states and 318 transitions. [2018-12-03 18:11:24,057 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 18:11:24,058 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 318 transitions. [2018-12-03 18:11:24,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-12-03 18:11:24,058 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:24,058 INFO L402 BasicCegarLoop]: trace histogram [42, 41, 2, 1, 1, 1] [2018-12-03 18:11:24,059 INFO L423 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:24,059 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:24,059 INFO L82 PathProgramCache]: Analyzing trace with hash -164846638, now seen corresponding path program 33 times [2018-12-03 18:11:24,059 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:24,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:24,060 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:24,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:24,060 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:24,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:24,589 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 18:11:24,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:24,590 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:24,590 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:24,590 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:24,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:24,590 INFO 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 18:11:24,599 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:11:24,599 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:11:24,635 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:11:24,635 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:24,638 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:24,648 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 18:11:24,648 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:25,823 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 18:11:25,843 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:25,844 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-12-03 18:11:25,844 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:25,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 18:11:25,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 18:11:25,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2018-12-03 18:11:25,846 INFO L87 Difference]: Start difference. First operand 287 states and 318 transitions. Second operand 35 states. [2018-12-03 18:11:25,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:25,944 INFO L93 Difference]: Finished difference Result 510 states and 572 transitions. [2018-12-03 18:11:25,944 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 18:11:25,945 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 88 [2018-12-03 18:11:25,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:25,946 INFO L225 Difference]: With dead ends: 510 [2018-12-03 18:11:25,946 INFO L226 Difference]: Without dead ends: 289 [2018-12-03 18:11:25,947 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2018-12-03 18:11:25,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2018-12-03 18:11:25,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2018-12-03 18:11:25,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2018-12-03 18:11:25,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 320 transitions. [2018-12-03 18:11:25,959 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 320 transitions. Word has length 88 [2018-12-03 18:11:25,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:25,959 INFO L480 AbstractCegarLoop]: Abstraction has 289 states and 320 transitions. [2018-12-03 18:11:25,959 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 18:11:25,959 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 320 transitions. [2018-12-03 18:11:25,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-12-03 18:11:25,960 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:25,960 INFO L402 BasicCegarLoop]: trace histogram [43, 42, 2, 1, 1, 1] [2018-12-03 18:11:25,960 INFO L423 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:25,961 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:25,961 INFO L82 PathProgramCache]: Analyzing trace with hash 2089340876, now seen corresponding path program 34 times [2018-12-03 18:11:25,961 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:25,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:25,962 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:25,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:25,962 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:25,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:26,629 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 18:11:26,629 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:26,630 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:26,630 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:26,630 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:26,630 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:26,630 INFO 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 18:11:26,639 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:26,640 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:11:26,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:26,680 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:26,702 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 18:11:26,703 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:28,060 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 18:11:28,078 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:28,078 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-12-03 18:11:28,079 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:28,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-12-03 18:11:28,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-12-03 18:11:28,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 18:11:28,080 INFO L87 Difference]: Start difference. First operand 289 states and 320 transitions. Second operand 36 states. [2018-12-03 18:11:28,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:28,167 INFO L93 Difference]: Finished difference Result 512 states and 574 transitions. [2018-12-03 18:11:28,167 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-12-03 18:11:28,167 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 90 [2018-12-03 18:11:28,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:28,169 INFO L225 Difference]: With dead ends: 512 [2018-12-03 18:11:28,169 INFO L226 Difference]: Without dead ends: 291 [2018-12-03 18:11:28,170 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 18:11:28,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2018-12-03 18:11:28,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 291. [2018-12-03 18:11:28,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 291 states. [2018-12-03 18:11:28,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 322 transitions. [2018-12-03 18:11:28,181 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 322 transitions. Word has length 90 [2018-12-03 18:11:28,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:28,182 INFO L480 AbstractCegarLoop]: Abstraction has 291 states and 322 transitions. [2018-12-03 18:11:28,182 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-12-03 18:11:28,182 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 322 transitions. [2018-12-03 18:11:28,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-12-03 18:11:28,183 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:28,183 INFO L402 BasicCegarLoop]: trace histogram [44, 43, 2, 1, 1, 1] [2018-12-03 18:11:28,183 INFO L423 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:28,183 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:28,183 INFO L82 PathProgramCache]: Analyzing trace with hash -594942650, now seen corresponding path program 35 times [2018-12-03 18:11:28,184 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:28,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:28,184 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:28,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:28,185 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:28,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:29,322 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 18:11:29,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:29,322 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:29,322 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:29,323 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:29,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:29,323 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:11:29,331 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:11:29,331 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:11:29,359 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 18:11:29,359 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:29,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:29,566 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 18:11:29,566 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:29,834 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 18:11:29,862 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:29,862 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 13, 13] total 59 [2018-12-03 18:11:29,862 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:29,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-12-03 18:11:29,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-12-03 18:11:29,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=941, Invalid=2481, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 18:11:29,864 INFO L87 Difference]: Start difference. First operand 291 states and 322 transitions. Second operand 48 states. [2018-12-03 18:11:31,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:31,323 INFO L93 Difference]: Finished difference Result 546 states and 611 transitions. [2018-12-03 18:11:31,324 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-12-03 18:11:31,324 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 92 [2018-12-03 18:11:31,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:31,325 INFO L225 Difference]: With dead ends: 546 [2018-12-03 18:11:31,325 INFO L226 Difference]: Without dead ends: 325 [2018-12-03 18:11:31,327 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2003 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3346, Invalid=7366, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 18:11:31,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2018-12-03 18:11:31,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 315. [2018-12-03 18:11:31,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 315 states. [2018-12-03 18:11:31,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 348 transitions. [2018-12-03 18:11:31,339 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 348 transitions. Word has length 92 [2018-12-03 18:11:31,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:31,339 INFO L480 AbstractCegarLoop]: Abstraction has 315 states and 348 transitions. [2018-12-03 18:11:31,339 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-12-03 18:11:31,339 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 348 transitions. [2018-12-03 18:11:31,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-12-03 18:11:31,340 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:31,340 INFO L402 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1] [2018-12-03 18:11:31,340 INFO L423 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:31,340 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:31,341 INFO L82 PathProgramCache]: Analyzing trace with hash 1083933822, now seen corresponding path program 36 times [2018-12-03 18:11:31,341 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:31,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:31,341 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:31,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:31,342 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:31,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:32,885 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 18:11:32,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:32,886 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:32,886 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:32,886 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:32,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:32,886 INFO 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 18:11:32,895 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:11:32,896 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:11:32,932 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:11:32,932 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:32,934 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:32,948 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 18:11:32,949 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:34,646 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 18:11:34,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:34,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-12-03 18:11:34,665 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:34,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 18:11:34,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 18:11:34,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 18:11:34,667 INFO L87 Difference]: Start difference. First operand 315 states and 348 transitions. Second operand 38 states. [2018-12-03 18:11:34,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:34,728 INFO L93 Difference]: Finished difference Result 560 states and 626 transitions. [2018-12-03 18:11:34,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-12-03 18:11:34,729 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 94 [2018-12-03 18:11:34,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:34,730 INFO L225 Difference]: With dead ends: 560 [2018-12-03 18:11:34,730 INFO L226 Difference]: Without dead ends: 317 [2018-12-03 18:11:34,731 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 18:11:34,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2018-12-03 18:11:34,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 317. [2018-12-03 18:11:34,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 317 states. [2018-12-03 18:11:34,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 350 transitions. [2018-12-03 18:11:34,743 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 350 transitions. Word has length 94 [2018-12-03 18:11:34,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:34,744 INFO L480 AbstractCegarLoop]: Abstraction has 317 states and 350 transitions. [2018-12-03 18:11:34,744 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 18:11:34,744 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 350 transitions. [2018-12-03 18:11:34,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-12-03 18:11:34,745 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:34,745 INFO L402 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1] [2018-12-03 18:11:34,745 INFO L423 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:34,745 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:34,746 INFO L82 PathProgramCache]: Analyzing trace with hash -423539464, now seen corresponding path program 37 times [2018-12-03 18:11:34,746 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:34,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:34,746 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:34,747 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:34,747 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:34,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:35,364 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 18:11:35,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:35,365 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:35,365 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:35,365 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:35,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:35,365 INFO 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 18:11:35,382 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:35,382 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:11:35,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:35,428 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:35,445 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 18:11:35,446 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:36,946 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 18:11:36,965 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:36,965 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-12-03 18:11:36,965 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:36,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-12-03 18:11:36,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-12-03 18:11:36,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2018-12-03 18:11:36,967 INFO L87 Difference]: Start difference. First operand 317 states and 350 transitions. Second operand 39 states. [2018-12-03 18:11:37,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:37,092 INFO L93 Difference]: Finished difference Result 562 states and 628 transitions. [2018-12-03 18:11:37,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 18:11:37,092 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 96 [2018-12-03 18:11:37,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:37,094 INFO L225 Difference]: With dead ends: 562 [2018-12-03 18:11:37,094 INFO L226 Difference]: Without dead ends: 319 [2018-12-03 18:11:37,095 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2018-12-03 18:11:37,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-12-03 18:11:37,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 319. [2018-12-03 18:11:37,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 319 states. [2018-12-03 18:11:37,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 352 transitions. [2018-12-03 18:11:37,109 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 352 transitions. Word has length 96 [2018-12-03 18:11:37,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:37,109 INFO L480 AbstractCegarLoop]: Abstraction has 319 states and 352 transitions. [2018-12-03 18:11:37,109 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-12-03 18:11:37,110 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 352 transitions. [2018-12-03 18:11:37,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-12-03 18:11:37,110 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:37,110 INFO L402 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1] [2018-12-03 18:11:37,111 INFO L423 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:37,111 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:37,111 INFO L82 PathProgramCache]: Analyzing trace with hash -1701388558, now seen corresponding path program 38 times [2018-12-03 18:11:37,111 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:37,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:37,112 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:37,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:37,112 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:37,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:37,809 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 18:11:37,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:37,809 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:37,809 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:37,810 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:37,810 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:37,810 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:11:37,822 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:11:37,823 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:11:37,852 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-12-03 18:11:37,853 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:37,854 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:37,894 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 18:11:37,894 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:38,552 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 18:11:38,571 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:38,571 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 13, 13] total 53 [2018-12-03 18:11:38,571 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:38,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 18:11:38,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 18:11:38,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 18:11:38,573 INFO L87 Difference]: Start difference. First operand 319 states and 352 transitions. Second operand 41 states. [2018-12-03 18:11:38,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:38,719 INFO L93 Difference]: Finished difference Result 1158 states and 1845 transitions. [2018-12-03 18:11:38,719 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 18:11:38,719 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 98 [2018-12-03 18:11:38,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:38,723 INFO L225 Difference]: With dead ends: 1158 [2018-12-03 18:11:38,723 INFO L226 Difference]: Without dead ends: 915 [2018-12-03 18:11:38,724 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 18:11:38,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 915 states. [2018-12-03 18:11:38,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 915 to 915. [2018-12-03 18:11:38,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 915 states. [2018-12-03 18:11:38,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 915 states to 915 states and 975 transitions. [2018-12-03 18:11:38,764 INFO L78 Accepts]: Start accepts. Automaton has 915 states and 975 transitions. Word has length 98 [2018-12-03 18:11:38,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:38,764 INFO L480 AbstractCegarLoop]: Abstraction has 915 states and 975 transitions. [2018-12-03 18:11:38,764 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 18:11:38,765 INFO L276 IsEmpty]: Start isEmpty. Operand 915 states and 975 transitions. [2018-12-03 18:11:38,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2018-12-03 18:11:38,767 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:38,767 INFO L402 BasicCegarLoop]: trace histogram [75, 72, 4, 1, 1, 1] [2018-12-03 18:11:38,767 INFO L423 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:38,768 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:38,768 INFO L82 PathProgramCache]: Analyzing trace with hash -1867851760, now seen corresponding path program 39 times [2018-12-03 18:11:38,768 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:38,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:38,769 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:38,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:38,769 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:38,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:39,443 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 18:11:39,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:39,444 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:39,444 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:39,444 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:39,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:39,444 INFO 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 18:11:39,453 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:11:39,453 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:11:39,512 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:11:39,512 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:39,516 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:39,543 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 18:11:39,543 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:41,303 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 18:11:41,322 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:41,323 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-12-03 18:11:41,323 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:41,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 18:11:41,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 18:11:41,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 18:11:41,325 INFO L87 Difference]: Start difference. First operand 915 states and 975 transitions. Second operand 41 states. [2018-12-03 18:11:41,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:41,721 INFO L93 Difference]: Finished difference Result 1754 states and 1874 transitions. [2018-12-03 18:11:41,722 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 18:11:41,722 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 154 [2018-12-03 18:11:41,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:41,725 INFO L225 Difference]: With dead ends: 1754 [2018-12-03 18:11:41,726 INFO L226 Difference]: Without dead ends: 917 [2018-12-03 18:11:41,727 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 268 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 18:11:41,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 917 states. [2018-12-03 18:11:41,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 917 to 917. [2018-12-03 18:11:41,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 917 states. [2018-12-03 18:11:41,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 917 states to 917 states and 977 transitions. [2018-12-03 18:11:41,758 INFO L78 Accepts]: Start accepts. Automaton has 917 states and 977 transitions. Word has length 154 [2018-12-03 18:11:41,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:41,758 INFO L480 AbstractCegarLoop]: Abstraction has 917 states and 977 transitions. [2018-12-03 18:11:41,758 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 18:11:41,758 INFO L276 IsEmpty]: Start isEmpty. Operand 917 states and 977 transitions. [2018-12-03 18:11:41,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-12-03 18:11:41,761 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:41,761 INFO L402 BasicCegarLoop]: trace histogram [76, 73, 4, 1, 1, 1] [2018-12-03 18:11:41,761 INFO L423 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:41,761 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:41,761 INFO L82 PathProgramCache]: Analyzing trace with hash 717430154, now seen corresponding path program 40 times [2018-12-03 18:11:41,762 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:41,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:41,763 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:41,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:41,763 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:41,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:43,524 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 18:11:43,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:43,524 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:43,524 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:43,524 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:43,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:43,524 INFO 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 18:11:43,534 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:43,534 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:11:43,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:43,597 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:43,618 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 18:11:43,618 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:45,395 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 18:11:45,414 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:45,414 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-12-03 18:11:45,414 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:45,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-12-03 18:11:45,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-12-03 18:11:45,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 18:11:45,416 INFO L87 Difference]: Start difference. First operand 917 states and 977 transitions. Second operand 42 states. [2018-12-03 18:11:45,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:45,497 INFO L93 Difference]: Finished difference Result 1756 states and 1876 transitions. [2018-12-03 18:11:45,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-12-03 18:11:45,497 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 156 [2018-12-03 18:11:45,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:45,500 INFO L225 Difference]: With dead ends: 1756 [2018-12-03 18:11:45,500 INFO L226 Difference]: Without dead ends: 919 [2018-12-03 18:11:45,502 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 271 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 18:11:45,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 919 states. [2018-12-03 18:11:45,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 919 to 919. [2018-12-03 18:11:45,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 919 states. [2018-12-03 18:11:45,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 919 states to 919 states and 979 transitions. [2018-12-03 18:11:45,533 INFO L78 Accepts]: Start accepts. Automaton has 919 states and 979 transitions. Word has length 156 [2018-12-03 18:11:45,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:45,534 INFO L480 AbstractCegarLoop]: Abstraction has 919 states and 979 transitions. [2018-12-03 18:11:45,534 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-12-03 18:11:45,534 INFO L276 IsEmpty]: Start isEmpty. Operand 919 states and 979 transitions. [2018-12-03 18:11:45,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-12-03 18:11:45,536 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:45,536 INFO L402 BasicCegarLoop]: trace histogram [77, 74, 4, 1, 1, 1] [2018-12-03 18:11:45,537 INFO L423 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:45,537 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:45,537 INFO L82 PathProgramCache]: Analyzing trace with hash -1612714876, now seen corresponding path program 41 times [2018-12-03 18:11:45,537 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:45,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:45,538 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:45,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:45,538 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:45,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:46,313 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 18:11:46,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:46,313 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:46,313 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:46,313 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:46,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:46,314 INFO 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 18:11:46,324 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:11:46,324 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:11:46,376 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-12-03 18:11:46,376 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:46,378 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:46,658 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 18:11:46,658 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:46,995 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 18:11:47,014 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:47,015 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 14, 14] total 67 [2018-12-03 18:11:47,015 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:47,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 18:11:47,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 18:11:47,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=3195, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 18:11:47,017 INFO L87 Difference]: Start difference. First operand 919 states and 979 transitions. Second operand 55 states. [2018-12-03 18:11:49,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:49,098 INFO L93 Difference]: Finished difference Result 1845 states and 1994 transitions. [2018-12-03 18:11:49,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-12-03 18:11:49,098 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 158 [2018-12-03 18:11:49,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:49,101 INFO L225 Difference]: With dead ends: 1845 [2018-12-03 18:11:49,101 INFO L226 Difference]: Without dead ends: 1008 [2018-12-03 18:11:49,104 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 18:11:49,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1008 states. [2018-12-03 18:11:49,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1008 to 997. [2018-12-03 18:11:49,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 997 states. [2018-12-03 18:11:49,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 997 states to 997 states and 1059 transitions. [2018-12-03 18:11:49,138 INFO L78 Accepts]: Start accepts. Automaton has 997 states and 1059 transitions. Word has length 158 [2018-12-03 18:11:49,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:49,138 INFO L480 AbstractCegarLoop]: Abstraction has 997 states and 1059 transitions. [2018-12-03 18:11:49,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 18:11:49,138 INFO L276 IsEmpty]: Start isEmpty. Operand 997 states and 1059 transitions. [2018-12-03 18:11:49,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-12-03 18:11:49,140 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:49,141 INFO L402 BasicCegarLoop]: trace histogram [78, 75, 4, 1, 1, 1] [2018-12-03 18:11:49,141 INFO L423 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:49,141 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:49,141 INFO L82 PathProgramCache]: Analyzing trace with hash 819664894, now seen corresponding path program 42 times [2018-12-03 18:11:49,141 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:49,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:49,142 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:49,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:49,142 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:49,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:50,023 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 18:11:50,024 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:50,024 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:50,024 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:50,024 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:50,024 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:50,024 INFO 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 18:11:50,035 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:11:50,036 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:11:50,120 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:11:50,120 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:50,126 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:50,201 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 18:11:50,201 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:52,511 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 18:11:52,530 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:52,530 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-12-03 18:11:52,531 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:52,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 18:11:52,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 18:11:52,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 18:11:52,532 INFO L87 Difference]: Start difference. First operand 997 states and 1059 transitions. Second operand 44 states. [2018-12-03 18:11:52,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:52,662 INFO L93 Difference]: Finished difference Result 1912 states and 2036 transitions. [2018-12-03 18:11:52,662 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 18:11:52,663 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 160 [2018-12-03 18:11:52,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:52,666 INFO L225 Difference]: With dead ends: 1912 [2018-12-03 18:11:52,666 INFO L226 Difference]: Without dead ends: 999 [2018-12-03 18:11:52,667 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 277 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 18:11:52,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 999 states. [2018-12-03 18:11:52,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 999 to 999. [2018-12-03 18:11:52,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 999 states. [2018-12-03 18:11:52,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 999 states to 999 states and 1061 transitions. [2018-12-03 18:11:52,699 INFO L78 Accepts]: Start accepts. Automaton has 999 states and 1061 transitions. Word has length 160 [2018-12-03 18:11:52,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:52,699 INFO L480 AbstractCegarLoop]: Abstraction has 999 states and 1061 transitions. [2018-12-03 18:11:52,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 18:11:52,699 INFO L276 IsEmpty]: Start isEmpty. Operand 999 states and 1061 transitions. [2018-12-03 18:11:52,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2018-12-03 18:11:52,702 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:52,702 INFO L402 BasicCegarLoop]: trace histogram [79, 76, 4, 1, 1, 1] [2018-12-03 18:11:52,702 INFO L423 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:52,702 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:52,702 INFO L82 PathProgramCache]: Analyzing trace with hash 480500216, now seen corresponding path program 43 times [2018-12-03 18:11:52,702 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:52,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:52,703 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:52,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:52,704 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:52,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:54,134 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 18:11:54,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:54,134 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:54,134 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:54,134 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:54,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:54,134 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:11:54,143 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:54,143 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:11:54,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:54,209 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:54,238 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 18:11:54,238 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:56,261 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 18:11:56,281 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:56,281 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2018-12-03 18:11:56,281 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:56,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 18:11:56,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 18:11:56,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2018-12-03 18:11:56,283 INFO L87 Difference]: Start difference. First operand 999 states and 1061 transitions. Second operand 45 states. [2018-12-03 18:11:56,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:56,406 INFO L93 Difference]: Finished difference Result 1914 states and 2038 transitions. [2018-12-03 18:11:56,407 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 18:11:56,407 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 162 [2018-12-03 18:11:56,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:56,410 INFO L225 Difference]: With dead ends: 1914 [2018-12-03 18:11:56,410 INFO L226 Difference]: Without dead ends: 1001 [2018-12-03 18:11:56,411 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 280 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2018-12-03 18:11:56,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1001 states. [2018-12-03 18:11:56,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1001 to 1001. [2018-12-03 18:11:56,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1001 states. [2018-12-03 18:11:56,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1001 states to 1001 states and 1063 transitions. [2018-12-03 18:11:56,442 INFO L78 Accepts]: Start accepts. Automaton has 1001 states and 1063 transitions. Word has length 162 [2018-12-03 18:11:56,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:56,442 INFO L480 AbstractCegarLoop]: Abstraction has 1001 states and 1063 transitions. [2018-12-03 18:11:56,443 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 18:11:56,443 INFO L276 IsEmpty]: Start isEmpty. Operand 1001 states and 1063 transitions. [2018-12-03 18:11:56,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-12-03 18:11:56,445 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:56,445 INFO L402 BasicCegarLoop]: trace histogram [80, 77, 4, 1, 1, 1] [2018-12-03 18:11:56,445 INFO L423 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:56,445 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:56,446 INFO L82 PathProgramCache]: Analyzing trace with hash 960759154, now seen corresponding path program 44 times [2018-12-03 18:11:56,446 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:56,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:56,447 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:56,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:56,447 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:56,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:57,836 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 18:11:57,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:57,836 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:57,836 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:57,836 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:57,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:57,836 INFO 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 18:11:57,846 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:11:57,846 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:11:57,884 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-03 18:11:57,884 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:57,886 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:58,195 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 18:11:58,195 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:58,590 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 18:11:58,609 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:58,609 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 15, 15] total 72 [2018-12-03 18:11:58,610 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:58,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 18:11:58,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 18:11:58,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1412, Invalid=3700, Unknown=0, NotChecked=0, Total=5112 [2018-12-03 18:11:58,611 INFO L87 Difference]: Start difference. First operand 1001 states and 1063 transitions. Second operand 59 states. [2018-12-03 18:12:02,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:02,342 INFO L93 Difference]: Finished difference Result 2004 states and 2156 transitions. [2018-12-03 18:12:02,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 18:12:02,343 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 164 [2018-12-03 18:12:02,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:02,347 INFO L225 Difference]: With dead ends: 2004 [2018-12-03 18:12:02,347 INFO L226 Difference]: Without dead ends: 1091 [2018-12-03 18:12:02,350 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 301 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3058 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=5060, Invalid=11196, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 18:12:02,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1091 states. [2018-12-03 18:12:02,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1091 to 1079. [2018-12-03 18:12:02,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1079 states. [2018-12-03 18:12:02,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1079 states to 1079 states and 1143 transitions. [2018-12-03 18:12:02,385 INFO L78 Accepts]: Start accepts. Automaton has 1079 states and 1143 transitions. Word has length 164 [2018-12-03 18:12:02,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:02,386 INFO L480 AbstractCegarLoop]: Abstraction has 1079 states and 1143 transitions. [2018-12-03 18:12:02,386 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 18:12:02,386 INFO L276 IsEmpty]: Start isEmpty. Operand 1079 states and 1143 transitions. [2018-12-03 18:12:02,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-12-03 18:12:02,388 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:02,388 INFO L402 BasicCegarLoop]: trace histogram [81, 79, 3, 1, 1, 1] [2018-12-03 18:12:02,389 INFO L423 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:02,389 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:02,389 INFO L82 PathProgramCache]: Analyzing trace with hash 277150890, now seen corresponding path program 45 times [2018-12-03 18:12:02,389 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:02,390 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:02,390 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:02,390 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:02,390 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:02,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:03,283 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 18:12:03,284 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:03,284 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:03,284 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:03,284 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:03,284 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:03,284 INFO 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 18:12:03,295 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:12:03,295 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:12:03,363 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:12:03,363 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:03,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:03,415 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 18:12:03,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:05,846 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 18:12:05,865 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:05,865 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 91 [2018-12-03 18:12:05,865 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:05,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 18:12:05,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 18:12:05,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 18:12:05,867 INFO L87 Difference]: Start difference. First operand 1079 states and 1143 transitions. Second operand 47 states. [2018-12-03 18:12:05,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:05,944 INFO L93 Difference]: Finished difference Result 2070 states and 2198 transitions. [2018-12-03 18:12:05,944 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 18:12:05,944 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 166 [2018-12-03 18:12:05,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:05,948 INFO L225 Difference]: With dead ends: 2070 [2018-12-03 18:12:05,948 INFO L226 Difference]: Without dead ends: 1081 [2018-12-03 18:12:05,950 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 286 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 18:12:05,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1081 states. [2018-12-03 18:12:05,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1081 to 1081. [2018-12-03 18:12:05,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1081 states. [2018-12-03 18:12:05,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1081 states to 1081 states and 1145 transitions. [2018-12-03 18:12:05,981 INFO L78 Accepts]: Start accepts. Automaton has 1081 states and 1145 transitions. Word has length 166 [2018-12-03 18:12:05,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:05,981 INFO L480 AbstractCegarLoop]: Abstraction has 1081 states and 1145 transitions. [2018-12-03 18:12:05,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 18:12:05,981 INFO L276 IsEmpty]: Start isEmpty. Operand 1081 states and 1145 transitions. [2018-12-03 18:12:05,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-12-03 18:12:05,984 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:05,984 INFO L402 BasicCegarLoop]: trace histogram [82, 80, 3, 1, 1, 1] [2018-12-03 18:12:05,984 INFO L423 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:05,984 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:05,985 INFO L82 PathProgramCache]: Analyzing trace with hash 1104075556, now seen corresponding path program 46 times [2018-12-03 18:12:05,985 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:05,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:05,985 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:05,986 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:05,986 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:06,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:06,884 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 18:12:06,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:06,884 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:06,884 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:06,884 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:06,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:06,885 INFO 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 18:12:06,894 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:06,894 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:12:06,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:06,963 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:06,993 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 18:12:06,993 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:09,533 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 18:12:09,552 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:09,552 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-12-03 18:12:09,552 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:09,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-12-03 18:12:09,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-12-03 18:12:09,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 18:12:09,554 INFO L87 Difference]: Start difference. First operand 1081 states and 1145 transitions. Second operand 48 states. [2018-12-03 18:12:09,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:09,668 INFO L93 Difference]: Finished difference Result 2072 states and 2200 transitions. [2018-12-03 18:12:09,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-03 18:12:09,668 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 168 [2018-12-03 18:12:09,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:09,672 INFO L225 Difference]: With dead ends: 2072 [2018-12-03 18:12:09,673 INFO L226 Difference]: Without dead ends: 1083 [2018-12-03 18:12:09,674 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 289 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 18:12:09,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1083 states. [2018-12-03 18:12:09,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1083 to 1083. [2018-12-03 18:12:09,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1083 states. [2018-12-03 18:12:09,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1083 states to 1083 states and 1147 transitions. [2018-12-03 18:12:09,707 INFO L78 Accepts]: Start accepts. Automaton has 1083 states and 1147 transitions. Word has length 168 [2018-12-03 18:12:09,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:09,707 INFO L480 AbstractCegarLoop]: Abstraction has 1083 states and 1147 transitions. [2018-12-03 18:12:09,707 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-12-03 18:12:09,708 INFO L276 IsEmpty]: Start isEmpty. Operand 1083 states and 1147 transitions. [2018-12-03 18:12:09,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-12-03 18:12:09,710 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:09,710 INFO L402 BasicCegarLoop]: trace histogram [83, 81, 3, 1, 1, 1] [2018-12-03 18:12:09,710 INFO L423 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:09,710 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:09,711 INFO L82 PathProgramCache]: Analyzing trace with hash 1209729822, now seen corresponding path program 47 times [2018-12-03 18:12:09,711 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:09,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:09,711 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:09,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:09,712 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:09,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:10,660 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 18:12:10,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:10,660 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:10,661 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:10,661 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:10,661 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:10,661 INFO 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 18:12:10,670 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:12:10,670 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:12:10,739 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2018-12-03 18:12:10,739 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:10,742 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:11,962 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 18:12:11,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:12,417 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 18:12:12,437 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:12,438 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 16, 16] total 77 [2018-12-03 18:12:12,438 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:12,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 18:12:12,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 18:12:12,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1610, Invalid=4242, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 18:12:12,439 INFO L87 Difference]: Start difference. First operand 1083 states and 1147 transitions. Second operand 63 states. [2018-12-03 18:12:15,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:15,164 INFO L93 Difference]: Finished difference Result 2163 states and 2318 transitions. [2018-12-03 18:12:15,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-03 18:12:15,164 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 170 [2018-12-03 18:12:15,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:15,168 INFO L225 Difference]: With dead ends: 2163 [2018-12-03 18:12:15,168 INFO L226 Difference]: Without dead ends: 1174 [2018-12-03 18:12:15,171 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 311 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3518 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=5788, Invalid=12844, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 18:12:15,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1174 states. [2018-12-03 18:12:15,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1174 to 1161. [2018-12-03 18:12:15,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1161 states. [2018-12-03 18:12:15,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1161 states to 1161 states and 1227 transitions. [2018-12-03 18:12:15,195 INFO L78 Accepts]: Start accepts. Automaton has 1161 states and 1227 transitions. Word has length 170 [2018-12-03 18:12:15,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:15,196 INFO L480 AbstractCegarLoop]: Abstraction has 1161 states and 1227 transitions. [2018-12-03 18:12:15,196 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 18:12:15,196 INFO L276 IsEmpty]: Start isEmpty. Operand 1161 states and 1227 transitions. [2018-12-03 18:12:15,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2018-12-03 18:12:15,197 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:15,197 INFO L402 BasicCegarLoop]: trace histogram [84, 82, 3, 1, 1, 1] [2018-12-03 18:12:15,198 INFO L423 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:15,198 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:15,198 INFO L82 PathProgramCache]: Analyzing trace with hash -2072343016, now seen corresponding path program 48 times [2018-12-03 18:12:15,198 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:15,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:15,199 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:15,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:15,199 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:15,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:16,917 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 18:12:16,918 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:16,918 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:16,918 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:16,918 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:16,918 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:16,919 INFO 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 18:12:16,953 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:12:16,953 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:12:17,019 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:12:17,019 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:17,023 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:17,056 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 18:12:17,057 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:19,744 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 18:12:19,764 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:19,764 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-12-03 18:12:19,764 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:19,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 18:12:19,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 18:12:19,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 18:12:19,766 INFO L87 Difference]: Start difference. First operand 1161 states and 1227 transitions. Second operand 50 states. [2018-12-03 18:12:19,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:19,875 INFO L93 Difference]: Finished difference Result 2228 states and 2360 transitions. [2018-12-03 18:12:19,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-03 18:12:19,875 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 172 [2018-12-03 18:12:19,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:19,879 INFO L225 Difference]: With dead ends: 2228 [2018-12-03 18:12:19,879 INFO L226 Difference]: Without dead ends: 1163 [2018-12-03 18:12:19,881 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 295 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 18:12:19,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1163 states. [2018-12-03 18:12:19,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1163 to 1163. [2018-12-03 18:12:19,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1163 states. [2018-12-03 18:12:19,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1163 states to 1163 states and 1229 transitions. [2018-12-03 18:12:19,904 INFO L78 Accepts]: Start accepts. Automaton has 1163 states and 1229 transitions. Word has length 172 [2018-12-03 18:12:19,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:19,904 INFO L480 AbstractCegarLoop]: Abstraction has 1163 states and 1229 transitions. [2018-12-03 18:12:19,904 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 18:12:19,904 INFO L276 IsEmpty]: Start isEmpty. Operand 1163 states and 1229 transitions. [2018-12-03 18:12:19,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-12-03 18:12:19,906 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:19,906 INFO L402 BasicCegarLoop]: trace histogram [85, 83, 3, 1, 1, 1] [2018-12-03 18:12:19,906 INFO L423 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:19,906 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:19,907 INFO L82 PathProgramCache]: Analyzing trace with hash -1205982958, now seen corresponding path program 49 times [2018-12-03 18:12:19,907 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:19,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:19,907 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:19,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:19,907 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:19,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:21,110 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 18:12:21,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:21,110 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:21,110 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:21,110 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:21,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:21,111 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 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 18:12:21,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:21,119 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:12:21,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:21,190 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:21,218 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 18:12:21,219 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:23,848 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 18:12:23,867 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:23,867 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 99 [2018-12-03 18:12:23,867 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:23,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-12-03 18:12:23,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-12-03 18:12:23,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2018-12-03 18:12:23,869 INFO L87 Difference]: Start difference. First operand 1163 states and 1229 transitions. Second operand 51 states. [2018-12-03 18:12:23,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:23,990 INFO L93 Difference]: Finished difference Result 2230 states and 2362 transitions. [2018-12-03 18:12:23,990 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 18:12:23,990 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 174 [2018-12-03 18:12:23,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:23,993 INFO L225 Difference]: With dead ends: 2230 [2018-12-03 18:12:23,993 INFO L226 Difference]: Without dead ends: 1165 [2018-12-03 18:12:23,995 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 18:12:23,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1165 states. [2018-12-03 18:12:24,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1165 to 1165. [2018-12-03 18:12:24,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1165 states. [2018-12-03 18:12:24,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1165 states to 1165 states and 1231 transitions. [2018-12-03 18:12:24,018 INFO L78 Accepts]: Start accepts. Automaton has 1165 states and 1231 transitions. Word has length 174 [2018-12-03 18:12:24,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:24,018 INFO L480 AbstractCegarLoop]: Abstraction has 1165 states and 1231 transitions. [2018-12-03 18:12:24,019 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-12-03 18:12:24,019 INFO L276 IsEmpty]: Start isEmpty. Operand 1165 states and 1231 transitions. [2018-12-03 18:12:24,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-12-03 18:12:24,020 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:24,020 INFO L402 BasicCegarLoop]: trace histogram [86, 84, 3, 1, 1, 1] [2018-12-03 18:12:24,020 INFO L423 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:24,020 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:24,020 INFO L82 PathProgramCache]: Analyzing trace with hash -1857622644, now seen corresponding path program 50 times [2018-12-03 18:12:24,021 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:24,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:24,021 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:24,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:24,022 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:24,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:25,802 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 18:12:25,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:25,803 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:25,803 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:25,803 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:25,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:25,803 INFO 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 18:12:25,815 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:12:25,816 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:12:25,885 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-12-03 18:12:25,885 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:25,888 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:26,276 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 18:12:26,277 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:26,823 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 18:12:26,842 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:26,842 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 17, 17] total 82 [2018-12-03 18:12:26,842 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:26,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-12-03 18:12:26,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-12-03 18:12:26,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1821, Invalid=4821, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 18:12:26,844 INFO L87 Difference]: Start difference. First operand 1165 states and 1231 transitions. Second operand 67 states. [2018-12-03 18:12:29,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:29,322 INFO L93 Difference]: Finished difference Result 2322 states and 2480 transitions. [2018-12-03 18:12:29,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 18:12:29,322 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 176 [2018-12-03 18:12:29,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:29,326 INFO L225 Difference]: With dead ends: 2322 [2018-12-03 18:12:29,326 INFO L226 Difference]: Without dead ends: 1257 [2018-12-03 18:12:29,329 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 321 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4010 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=6565, Invalid=14605, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 18:12:29,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1257 states. [2018-12-03 18:12:29,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1257 to 1243. [2018-12-03 18:12:29,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1243 states. [2018-12-03 18:12:29,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1243 states to 1243 states and 1311 transitions. [2018-12-03 18:12:29,355 INFO L78 Accepts]: Start accepts. Automaton has 1243 states and 1311 transitions. Word has length 176 [2018-12-03 18:12:29,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:29,355 INFO L480 AbstractCegarLoop]: Abstraction has 1243 states and 1311 transitions. [2018-12-03 18:12:29,355 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-12-03 18:12:29,355 INFO L276 IsEmpty]: Start isEmpty. Operand 1243 states and 1311 transitions. [2018-12-03 18:12:29,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2018-12-03 18:12:29,357 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:29,357 INFO L402 BasicCegarLoop]: trace histogram [87, 85, 3, 1, 1, 1] [2018-12-03 18:12:29,357 INFO L423 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:29,357 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:29,357 INFO L82 PathProgramCache]: Analyzing trace with hash -803826426, now seen corresponding path program 51 times [2018-12-03 18:12:29,357 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:29,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:29,358 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:29,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:29,359 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:29,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:30,598 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 18:12:30,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:30,599 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:30,599 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:30,599 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:30,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:30,599 INFO 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 18:12:30,608 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:12:30,608 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:12:30,675 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:12:30,675 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:30,679 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:30,705 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 18:12:30,705 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:33,493 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 18:12:33,512 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:33,512 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2018-12-03 18:12:33,512 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:33,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 18:12:33,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 18:12:33,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 18:12:33,514 INFO L87 Difference]: Start difference. First operand 1243 states and 1311 transitions. Second operand 53 states. [2018-12-03 18:12:33,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:33,619 INFO L93 Difference]: Finished difference Result 2386 states and 2522 transitions. [2018-12-03 18:12:33,620 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 18:12:33,620 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 178 [2018-12-03 18:12:33,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:33,625 INFO L225 Difference]: With dead ends: 2386 [2018-12-03 18:12:33,625 INFO L226 Difference]: Without dead ends: 1245 [2018-12-03 18:12:33,627 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 304 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 18:12:33,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1245 states. [2018-12-03 18:12:33,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1245 to 1245. [2018-12-03 18:12:33,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1245 states. [2018-12-03 18:12:33,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1245 states to 1245 states and 1313 transitions. [2018-12-03 18:12:33,653 INFO L78 Accepts]: Start accepts. Automaton has 1245 states and 1313 transitions. Word has length 178 [2018-12-03 18:12:33,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:33,653 INFO L480 AbstractCegarLoop]: Abstraction has 1245 states and 1313 transitions. [2018-12-03 18:12:33,653 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 18:12:33,653 INFO L276 IsEmpty]: Start isEmpty. Operand 1245 states and 1313 transitions. [2018-12-03 18:12:33,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2018-12-03 18:12:33,655 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:33,655 INFO L402 BasicCegarLoop]: trace histogram [88, 86, 3, 1, 1, 1] [2018-12-03 18:12:33,655 INFO L423 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:33,655 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:33,655 INFO L82 PathProgramCache]: Analyzing trace with hash -1510699904, now seen corresponding path program 52 times [2018-12-03 18:12:33,655 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:33,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:33,656 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:33,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:33,656 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:33,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:34,953 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 18:12:34,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:34,954 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:34,954 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:34,954 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:34,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:34,954 INFO 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 18:12:34,963 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:34,963 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:12:35,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:35,033 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:35,071 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 18:12:35,071 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:38,121 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 18:12:38,140 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:38,140 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-12-03 18:12:38,140 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:38,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-12-03 18:12:38,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-12-03 18:12:38,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 18:12:38,142 INFO L87 Difference]: Start difference. First operand 1245 states and 1313 transitions. Second operand 54 states. [2018-12-03 18:12:38,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:38,269 INFO L93 Difference]: Finished difference Result 2388 states and 2524 transitions. [2018-12-03 18:12:38,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 18:12:38,269 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 180 [2018-12-03 18:12:38,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:38,272 INFO L225 Difference]: With dead ends: 2388 [2018-12-03 18:12:38,273 INFO L226 Difference]: Without dead ends: 1247 [2018-12-03 18:12:38,274 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 307 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 18:12:38,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1247 states. [2018-12-03 18:12:38,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1247 to 1247. [2018-12-03 18:12:38,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1247 states. [2018-12-03 18:12:38,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1247 states to 1247 states and 1315 transitions. [2018-12-03 18:12:38,300 INFO L78 Accepts]: Start accepts. Automaton has 1247 states and 1315 transitions. Word has length 180 [2018-12-03 18:12:38,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:38,300 INFO L480 AbstractCegarLoop]: Abstraction has 1247 states and 1315 transitions. [2018-12-03 18:12:38,300 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-12-03 18:12:38,300 INFO L276 IsEmpty]: Start isEmpty. Operand 1247 states and 1315 transitions. [2018-12-03 18:12:38,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-12-03 18:12:38,302 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:38,302 INFO L402 BasicCegarLoop]: trace histogram [89, 87, 3, 1, 1, 1] [2018-12-03 18:12:38,302 INFO L423 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:38,302 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:38,303 INFO L82 PathProgramCache]: Analyzing trace with hash 2083687802, now seen corresponding path program 53 times [2018-12-03 18:12:38,303 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:38,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:38,303 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:38,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:38,303 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:38,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:39,438 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 18:12:39,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:39,438 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:39,438 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:39,438 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:39,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:39,438 INFO 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 18:12:39,447 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:12:39,447 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:12:39,511 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-12-03 18:12:39,511 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:39,514 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:40,184 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 18:12:40,184 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:40,770 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 18:12:40,790 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:40,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 18, 18] total 87 [2018-12-03 18:12:40,790 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:40,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 18:12:40,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 18:12:40,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2045, Invalid=5437, Unknown=0, NotChecked=0, Total=7482 [2018-12-03 18:12:40,792 INFO L87 Difference]: Start difference. First operand 1247 states and 1315 transitions. Second operand 71 states. [2018-12-03 18:12:43,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:43,573 INFO L93 Difference]: Finished difference Result 2481 states and 2642 transitions. [2018-12-03 18:12:43,574 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-03 18:12:43,574 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 182 [2018-12-03 18:12:43,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:43,578 INFO L225 Difference]: With dead ends: 2481 [2018-12-03 18:12:43,578 INFO L226 Difference]: Without dead ends: 1340 [2018-12-03 18:12:43,580 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4534 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=7391, Invalid=16479, Unknown=0, NotChecked=0, Total=23870 [2018-12-03 18:12:43,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1340 states. [2018-12-03 18:12:43,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1340 to 1325. [2018-12-03 18:12:43,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1325 states. [2018-12-03 18:12:43,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1325 states to 1325 states and 1395 transitions. [2018-12-03 18:12:43,606 INFO L78 Accepts]: Start accepts. Automaton has 1325 states and 1395 transitions. Word has length 182 [2018-12-03 18:12:43,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:43,607 INFO L480 AbstractCegarLoop]: Abstraction has 1325 states and 1395 transitions. [2018-12-03 18:12:43,607 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 18:12:43,607 INFO L276 IsEmpty]: Start isEmpty. Operand 1325 states and 1395 transitions. [2018-12-03 18:12:43,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-12-03 18:12:43,608 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:43,608 INFO L402 BasicCegarLoop]: trace histogram [90, 88, 3, 1, 1, 1] [2018-12-03 18:12:43,608 INFO L423 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:43,609 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:43,609 INFO L82 PathProgramCache]: Analyzing trace with hash 1540026740, now seen corresponding path program 54 times [2018-12-03 18:12:43,609 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:43,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:43,610 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:43,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:43,610 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:43,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:44,775 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 18:12:44,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:44,776 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:44,776 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:44,776 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:44,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:44,776 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 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 18:12:44,785 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:12:44,785 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:12:44,856 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:12:44,856 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:44,859 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:44,898 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 18:12:44,898 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:48,107 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 18:12:48,126 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:48,127 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 109 [2018-12-03 18:12:48,127 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:48,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-12-03 18:12:48,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-12-03 18:12:48,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5995, Invalid=5995, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 18:12:48,129 INFO L87 Difference]: Start difference. First operand 1325 states and 1395 transitions. Second operand 56 states. [2018-12-03 18:12:48,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:48,261 INFO L93 Difference]: Finished difference Result 2544 states and 2684 transitions. [2018-12-03 18:12:48,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-12-03 18:12:48,261 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 184 [2018-12-03 18:12:48,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:48,265 INFO L225 Difference]: With dead ends: 2544 [2018-12-03 18:12:48,265 INFO L226 Difference]: Without dead ends: 1327 [2018-12-03 18:12:48,267 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 18:12:48,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1327 states. [2018-12-03 18:12:48,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1327 to 1327. [2018-12-03 18:12:48,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1327 states. [2018-12-03 18:12:48,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1327 states to 1327 states and 1397 transitions. [2018-12-03 18:12:48,320 INFO L78 Accepts]: Start accepts. Automaton has 1327 states and 1397 transitions. Word has length 184 [2018-12-03 18:12:48,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:48,320 INFO L480 AbstractCegarLoop]: Abstraction has 1327 states and 1397 transitions. [2018-12-03 18:12:48,320 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-12-03 18:12:48,320 INFO L276 IsEmpty]: Start isEmpty. Operand 1327 states and 1397 transitions. [2018-12-03 18:12:48,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-12-03 18:12:48,322 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:48,322 INFO L402 BasicCegarLoop]: trace histogram [91, 89, 3, 1, 1, 1] [2018-12-03 18:12:48,322 INFO L423 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:48,322 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:48,323 INFO L82 PathProgramCache]: Analyzing trace with hash -255072914, now seen corresponding path program 55 times [2018-12-03 18:12:48,323 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:48,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:48,324 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:48,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:48,324 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:48,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:49,492 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 18:12:49,492 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:49,492 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:49,492 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:49,492 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:49,492 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:49,492 INFO 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 18:12:49,501 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:49,501 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:12:49,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:49,580 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:49,621 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 18:12:49,621 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:53,194 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 18:12:53,214 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:53,215 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 111 [2018-12-03 18:12:53,215 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:53,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-12-03 18:12:53,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-12-03 18:12:53,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6216, Invalid=6216, Unknown=0, NotChecked=0, Total=12432 [2018-12-03 18:12:53,217 INFO L87 Difference]: Start difference. First operand 1327 states and 1397 transitions. Second operand 57 states. [2018-12-03 18:12:53,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:53,332 INFO L93 Difference]: Finished difference Result 2546 states and 2686 transitions. [2018-12-03 18:12:53,332 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 18:12:53,332 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 186 [2018-12-03 18:12:53,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:53,336 INFO L225 Difference]: With dead ends: 2546 [2018-12-03 18:12:53,336 INFO L226 Difference]: Without dead ends: 1329 [2018-12-03 18:12:53,338 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 316 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=6216, Invalid=6216, Unknown=0, NotChecked=0, Total=12432 [2018-12-03 18:12:53,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1329 states. [2018-12-03 18:12:53,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1329 to 1329. [2018-12-03 18:12:53,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1329 states. [2018-12-03 18:12:53,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1329 states to 1329 states and 1399 transitions. [2018-12-03 18:12:53,366 INFO L78 Accepts]: Start accepts. Automaton has 1329 states and 1399 transitions. Word has length 186 [2018-12-03 18:12:53,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:53,366 INFO L480 AbstractCegarLoop]: Abstraction has 1329 states and 1399 transitions. [2018-12-03 18:12:53,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-12-03 18:12:53,366 INFO L276 IsEmpty]: Start isEmpty. Operand 1329 states and 1399 transitions. [2018-12-03 18:12:53,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-12-03 18:12:53,368 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:53,368 INFO L402 BasicCegarLoop]: trace histogram [92, 90, 3, 1, 1, 1] [2018-12-03 18:12:53,368 INFO L423 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:53,368 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:53,369 INFO L82 PathProgramCache]: Analyzing trace with hash 1231012584, now seen corresponding path program 56 times [2018-12-03 18:12:53,369 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:53,369 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:53,369 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:53,369 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:53,369 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:53,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:54,632 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 18:12:54,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:54,632 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:54,633 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:54,633 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:54,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:54,633 INFO 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 18:12:54,643 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:12:54,644 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:12:54,703 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2018-12-03 18:12:54,704 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:54,706 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:55,475 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 18:12:55,475 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:56,485 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 18:12:56,504 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:56,504 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 19, 19] total 92 [2018-12-03 18:12:56,504 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:56,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-03 18:12:56,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-03 18:12:56,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2282, Invalid=6090, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 18:12:56,506 INFO L87 Difference]: Start difference. First operand 1329 states and 1399 transitions. Second operand 75 states. [2018-12-03 18:12:59,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:59,226 INFO L93 Difference]: Finished difference Result 2640 states and 2804 transitions. [2018-12-03 18:12:59,227 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 18:12:59,227 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 188 [2018-12-03 18:12:59,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:59,232 INFO L225 Difference]: With dead ends: 2640 [2018-12-03 18:12:59,232 INFO L226 Difference]: Without dead ends: 1423 [2018-12-03 18:12:59,236 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 341 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5090 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=8266, Invalid=18466, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 18:12:59,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1423 states. [2018-12-03 18:12:59,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1423 to 1407. [2018-12-03 18:12:59,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1407 states. [2018-12-03 18:12:59,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1407 states to 1407 states and 1479 transitions. [2018-12-03 18:12:59,265 INFO L78 Accepts]: Start accepts. Automaton has 1407 states and 1479 transitions. Word has length 188 [2018-12-03 18:12:59,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:59,265 INFO L480 AbstractCegarLoop]: Abstraction has 1407 states and 1479 transitions. [2018-12-03 18:12:59,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-03 18:12:59,265 INFO L276 IsEmpty]: Start isEmpty. Operand 1407 states and 1479 transitions. [2018-12-03 18:12:59,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2018-12-03 18:12:59,267 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:59,267 INFO L402 BasicCegarLoop]: trace histogram [93, 91, 3, 1, 1, 1] [2018-12-03 18:12:59,267 INFO L423 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:59,267 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:59,268 INFO L82 PathProgramCache]: Analyzing trace with hash -2094955678, now seen corresponding path program 57 times [2018-12-03 18:12:59,268 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:59,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:59,269 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:59,269 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:59,269 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:59,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:00,843 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 18:13:00,843 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:00,843 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:00,843 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:00,844 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:00,844 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:00,844 INFO 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 18:13:00,890 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:13:00,890 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:13:00,961 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:13:00,962 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:13:00,965 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:00,997 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 18:13:00,997 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:04,502 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 18:13:04,522 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:04,523 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 115 [2018-12-03 18:13:04,523 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:04,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 18:13:04,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 18:13:04,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6670, Invalid=6670, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 18:13:04,525 INFO L87 Difference]: Start difference. First operand 1407 states and 1479 transitions. Second operand 59 states. [2018-12-03 18:13:04,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:04,678 INFO L93 Difference]: Finished difference Result 2702 states and 2846 transitions. [2018-12-03 18:13:04,678 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 18:13:04,678 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 190 [2018-12-03 18:13:04,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:04,683 INFO L225 Difference]: With dead ends: 2702 [2018-12-03 18:13:04,683 INFO L226 Difference]: Without dead ends: 1409 [2018-12-03 18:13:04,685 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 436 GetRequests, 322 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=6670, Invalid=6670, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 18:13:04,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1409 states. [2018-12-03 18:13:04,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1409 to 1409. [2018-12-03 18:13:04,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1409 states. [2018-12-03 18:13:04,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1409 states to 1409 states and 1481 transitions. [2018-12-03 18:13:04,716 INFO L78 Accepts]: Start accepts. Automaton has 1409 states and 1481 transitions. Word has length 190 [2018-12-03 18:13:04,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:04,716 INFO L480 AbstractCegarLoop]: Abstraction has 1409 states and 1481 transitions. [2018-12-03 18:13:04,716 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 18:13:04,716 INFO L276 IsEmpty]: Start isEmpty. Operand 1409 states and 1481 transitions. [2018-12-03 18:13:04,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2018-12-03 18:13:04,718 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:04,718 INFO L402 BasicCegarLoop]: trace histogram [94, 92, 3, 1, 1, 1] [2018-12-03 18:13:04,718 INFO L423 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:04,718 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:04,719 INFO L82 PathProgramCache]: Analyzing trace with hash -1959390244, now seen corresponding path program 58 times [2018-12-03 18:13:04,719 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:04,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:04,719 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:13:04,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:04,720 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:04,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:06,156 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 18:13:06,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:06,157 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:06,157 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:06,157 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:06,157 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:06,157 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:13:06,168 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:13:06,168 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:13:06,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:06,241 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:06,317 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 18:13:06,317 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:09,913 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 18:13:09,932 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:09,932 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 117 [2018-12-03 18:13:09,932 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:09,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-12-03 18:13:09,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-12-03 18:13:09,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6903, Invalid=6903, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 18:13:09,934 INFO L87 Difference]: Start difference. First operand 1409 states and 1481 transitions. Second operand 60 states. [2018-12-03 18:13:10,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:10,107 INFO L93 Difference]: Finished difference Result 2704 states and 2848 transitions. [2018-12-03 18:13:10,107 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-12-03 18:13:10,107 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 192 [2018-12-03 18:13:10,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:10,112 INFO L225 Difference]: With dead ends: 2704 [2018-12-03 18:13:10,113 INFO L226 Difference]: Without dead ends: 1411 [2018-12-03 18:13:10,116 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 325 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=6903, Invalid=6903, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 18:13:10,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1411 states. [2018-12-03 18:13:10,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1411 to 1411. [2018-12-03 18:13:10,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1411 states. [2018-12-03 18:13:10,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1411 states to 1411 states and 1483 transitions. [2018-12-03 18:13:10,150 INFO L78 Accepts]: Start accepts. Automaton has 1411 states and 1483 transitions. Word has length 192 [2018-12-03 18:13:10,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:10,150 INFO L480 AbstractCegarLoop]: Abstraction has 1411 states and 1483 transitions. [2018-12-03 18:13:10,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-12-03 18:13:10,151 INFO L276 IsEmpty]: Start isEmpty. Operand 1411 states and 1483 transitions. [2018-12-03 18:13:10,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-12-03 18:13:10,153 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:10,153 INFO L402 BasicCegarLoop]: trace histogram [95, 93, 3, 1, 1, 1] [2018-12-03 18:13:10,154 INFO L423 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:10,154 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:10,154 INFO L82 PathProgramCache]: Analyzing trace with hash -530027050, now seen corresponding path program 59 times [2018-12-03 18:13:10,154 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:10,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:10,155 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:13:10,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:10,155 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:10,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:11,812 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 18:13:11,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:11,812 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:11,813 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:11,813 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:11,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:11,813 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 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 18:13:11,851 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:13:11,851 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:13:11,913 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2018-12-03 18:13:11,913 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:13:11,916 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:12,473 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 18:13:12,473 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:13,206 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 18:13:13,225 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:13,225 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 20, 20] total 97 [2018-12-03 18:13:13,225 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:13,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-12-03 18:13:13,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-12-03 18:13:13,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2532, Invalid=6780, Unknown=0, NotChecked=0, Total=9312 [2018-12-03 18:13:13,227 INFO L87 Difference]: Start difference. First operand 1411 states and 1483 transitions. Second operand 79 states. [2018-12-03 18:13:16,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:16,499 INFO L93 Difference]: Finished difference Result 2799 states and 2966 transitions. [2018-12-03 18:13:16,499 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2018-12-03 18:13:16,500 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 194 [2018-12-03 18:13:16,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:16,504 INFO L225 Difference]: With dead ends: 2799 [2018-12-03 18:13:16,504 INFO L226 Difference]: Without dead ends: 1506 [2018-12-03 18:13:16,508 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 522 GetRequests, 351 SyntacticMatches, 0 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5678 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=9190, Invalid=20566, Unknown=0, NotChecked=0, Total=29756 [2018-12-03 18:13:16,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1506 states. [2018-12-03 18:13:16,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1506 to 1489. [2018-12-03 18:13:16,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1489 states. [2018-12-03 18:13:16,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1489 states to 1489 states and 1563 transitions. [2018-12-03 18:13:16,550 INFO L78 Accepts]: Start accepts. Automaton has 1489 states and 1563 transitions. Word has length 194 [2018-12-03 18:13:16,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:16,550 INFO L480 AbstractCegarLoop]: Abstraction has 1489 states and 1563 transitions. [2018-12-03 18:13:16,550 INFO L481 AbstractCegarLoop]: Interpolant automaton has 79 states. [2018-12-03 18:13:16,551 INFO L276 IsEmpty]: Start isEmpty. Operand 1489 states and 1563 transitions. [2018-12-03 18:13:16,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2018-12-03 18:13:16,552 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:16,552 INFO L402 BasicCegarLoop]: trace histogram [96, 94, 3, 1, 1, 1] [2018-12-03 18:13:16,553 INFO L423 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:16,553 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:16,553 INFO L82 PathProgramCache]: Analyzing trace with hash -490984752, now seen corresponding path program 60 times [2018-12-03 18:13:16,553 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:16,553 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:16,554 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:13:16,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:16,554 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:16,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:18,003 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 18:13:18,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:18,004 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:18,004 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:18,004 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:18,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:18,004 INFO 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 18:13:18,013 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:13:18,014 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:13:18,086 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:13:18,086 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:13:18,090 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:18,129 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 18:13:18,130 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:22,248 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 18:13:22,267 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:22,267 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 121 [2018-12-03 18:13:22,267 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:22,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-12-03 18:13:22,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-12-03 18:13:22,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7381, Invalid=7381, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 18:13:22,270 INFO L87 Difference]: Start difference. First operand 1489 states and 1563 transitions. Second operand 62 states. [2018-12-03 18:13:22,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:22,398 INFO L93 Difference]: Finished difference Result 2860 states and 3008 transitions. [2018-12-03 18:13:22,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-03 18:13:22,398 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 196 [2018-12-03 18:13:22,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:22,401 INFO L225 Difference]: With dead ends: 2860 [2018-12-03 18:13:22,401 INFO L226 Difference]: Without dead ends: 1491 [2018-12-03 18:13:22,403 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 451 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=7381, Invalid=7381, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 18:13:22,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1491 states. [2018-12-03 18:13:22,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1491 to 1491. [2018-12-03 18:13:22,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1491 states. [2018-12-03 18:13:22,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1491 states to 1491 states and 1565 transitions. [2018-12-03 18:13:22,437 INFO L78 Accepts]: Start accepts. Automaton has 1491 states and 1565 transitions. Word has length 196 [2018-12-03 18:13:22,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:22,437 INFO L480 AbstractCegarLoop]: Abstraction has 1491 states and 1565 transitions. [2018-12-03 18:13:22,438 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-12-03 18:13:22,438 INFO L276 IsEmpty]: Start isEmpty. Operand 1491 states and 1565 transitions. [2018-12-03 18:13:22,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2018-12-03 18:13:22,440 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:22,440 INFO L402 BasicCegarLoop]: trace histogram [97, 95, 3, 1, 1, 1] [2018-12-03 18:13:22,441 INFO L423 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:22,441 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:22,441 INFO L82 PathProgramCache]: Analyzing trace with hash 1121777610, now seen corresponding path program 61 times [2018-12-03 18:13:22,441 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:22,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:22,442 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:13:22,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:22,442 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:22,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:23,948 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 18:13:23,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:23,948 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:23,948 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:23,949 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:23,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:23,949 INFO 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 18:13:23,958 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:13:23,958 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:13:24,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:24,034 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:24,067 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 18:13:24,068 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:28,303 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 18:13:28,322 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:28,323 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 123 [2018-12-03 18:13:28,323 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:28,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 18:13:28,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 18:13:28,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7626, Invalid=7626, Unknown=0, NotChecked=0, Total=15252 [2018-12-03 18:13:28,325 INFO L87 Difference]: Start difference. First operand 1491 states and 1565 transitions. Second operand 63 states. [2018-12-03 18:13:28,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:28,470 INFO L93 Difference]: Finished difference Result 2862 states and 3010 transitions. [2018-12-03 18:13:28,471 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 18:13:28,471 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 198 [2018-12-03 18:13:28,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:28,473 INFO L225 Difference]: With dead ends: 2862 [2018-12-03 18:13:28,473 INFO L226 Difference]: Without dead ends: 1493 [2018-12-03 18:13:28,475 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 334 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=7626, Invalid=7626, Unknown=0, NotChecked=0, Total=15252 [2018-12-03 18:13:28,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1493 states. [2018-12-03 18:13:28,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1493 to 1493. [2018-12-03 18:13:28,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1493 states. [2018-12-03 18:13:28,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1493 states to 1493 states and 1567 transitions. [2018-12-03 18:13:28,507 INFO L78 Accepts]: Start accepts. Automaton has 1493 states and 1567 transitions. Word has length 198 [2018-12-03 18:13:28,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:28,508 INFO L480 AbstractCegarLoop]: Abstraction has 1493 states and 1567 transitions. [2018-12-03 18:13:28,508 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 18:13:28,508 INFO L276 IsEmpty]: Start isEmpty. Operand 1493 states and 1567 transitions. [2018-12-03 18:13:28,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-12-03 18:13:28,511 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:28,511 INFO L402 BasicCegarLoop]: trace histogram [98, 96, 3, 1, 1, 1] [2018-12-03 18:13:28,511 INFO L423 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:28,511 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:28,511 INFO L82 PathProgramCache]: Analyzing trace with hash 503213636, now seen corresponding path program 62 times [2018-12-03 18:13:28,511 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:28,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:28,512 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:13:28,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:28,513 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:28,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:30,600 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 18:13:30,600 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:30,600 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:30,600 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:30,600 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:30,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:30,601 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:13:30,610 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:13:30,611 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:13:30,666 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-12-03 18:13:30,666 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:13:30,668 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:31,499 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 18:13:31,500 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:32,357 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 18:13:32,376 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:32,376 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 21, 21] total 102 [2018-12-03 18:13:32,376 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:32,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 18:13:32,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 18:13:32,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2795, Invalid=7507, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 18:13:32,378 INFO L87 Difference]: Start difference. First operand 1493 states and 1567 transitions. Second operand 83 states. [2018-12-03 18:13:36,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:36,664 INFO L93 Difference]: Finished difference Result 2958 states and 3128 transitions. [2018-12-03 18:13:36,664 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2018-12-03 18:13:36,664 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 200 [2018-12-03 18:13:36,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:36,666 INFO L225 Difference]: With dead ends: 2958 [2018-12-03 18:13:36,666 INFO L226 Difference]: Without dead ends: 1589 [2018-12-03 18:13:36,669 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 361 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6298 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=10163, Invalid=22779, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 18:13:36,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1589 states. [2018-12-03 18:13:36,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1589 to 1571. [2018-12-03 18:13:36,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1571 states. [2018-12-03 18:13:36,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1571 states to 1571 states and 1647 transitions. [2018-12-03 18:13:36,703 INFO L78 Accepts]: Start accepts. Automaton has 1571 states and 1647 transitions. Word has length 200 [2018-12-03 18:13:36,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:36,703 INFO L480 AbstractCegarLoop]: Abstraction has 1571 states and 1647 transitions. [2018-12-03 18:13:36,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 18:13:36,703 INFO L276 IsEmpty]: Start isEmpty. Operand 1571 states and 1647 transitions. [2018-12-03 18:13:36,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2018-12-03 18:13:36,705 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:36,705 INFO L402 BasicCegarLoop]: trace histogram [99, 98, 2, 1, 1, 1] [2018-12-03 18:13:36,706 INFO L423 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:36,706 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:36,706 INFO L82 PathProgramCache]: Analyzing trace with hash -1573666948, now seen corresponding path program 63 times [2018-12-03 18:13:36,706 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:36,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:36,707 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:13:36,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:36,708 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:36,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:38,204 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 18:13:38,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:38,204 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:38,205 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:38,205 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:38,205 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:38,205 INFO 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 18:13:38,216 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:13:38,216 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:13:38,290 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:13:38,291 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:13:38,294 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:38,328 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 18:13:38,328 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:42,657 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 18:13:42,676 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:42,676 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 127 [2018-12-03 18:13:42,676 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:42,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 18:13:42,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 18:13:42,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8128, Invalid=8128, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 18:13:42,679 INFO L87 Difference]: Start difference. First operand 1571 states and 1647 transitions. Second operand 65 states. [2018-12-03 18:13:42,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:42,868 INFO L93 Difference]: Finished difference Result 3018 states and 3170 transitions. [2018-12-03 18:13:42,868 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 18:13:42,868 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 202 [2018-12-03 18:13:42,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:42,870 INFO L225 Difference]: With dead ends: 3018 [2018-12-03 18:13:42,871 INFO L226 Difference]: Without dead ends: 1573 [2018-12-03 18:13:42,873 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 340 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=8128, Invalid=8128, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 18:13:42,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1573 states. [2018-12-03 18:13:42,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1573 to 1573. [2018-12-03 18:13:42,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1573 states. [2018-12-03 18:13:42,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1573 states to 1573 states and 1649 transitions. [2018-12-03 18:13:42,919 INFO L78 Accepts]: Start accepts. Automaton has 1573 states and 1649 transitions. Word has length 202 [2018-12-03 18:13:42,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:42,920 INFO L480 AbstractCegarLoop]: Abstraction has 1573 states and 1649 transitions. [2018-12-03 18:13:42,920 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 18:13:42,920 INFO L276 IsEmpty]: Start isEmpty. Operand 1573 states and 1649 transitions. [2018-12-03 18:13:42,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-12-03 18:13:42,922 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:42,923 INFO L402 BasicCegarLoop]: trace histogram [100, 99, 2, 1, 1, 1] [2018-12-03 18:13:42,923 INFO L423 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:42,923 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:42,923 INFO L82 PathProgramCache]: Analyzing trace with hash -1973327626, now seen corresponding path program 64 times [2018-12-03 18:13:42,923 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:42,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:42,924 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:13:42,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:42,924 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:42,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:44,571 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 18:13:44,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:44,572 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:44,572 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:44,572 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:44,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:44,572 INFO 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 18:13:44,582 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:13:44,583 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:13:44,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:44,660 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:44,708 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 18:13:44,709 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:50,059 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 18:13:50,079 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:50,079 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 129 [2018-12-03 18:13:50,079 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:50,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-12-03 18:13:50,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-12-03 18:13:50,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8385, Invalid=8385, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 18:13:50,081 INFO L87 Difference]: Start difference. First operand 1573 states and 1649 transitions. Second operand 66 states. [2018-12-03 18:13:50,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:50,219 INFO L93 Difference]: Finished difference Result 3020 states and 3172 transitions. [2018-12-03 18:13:50,219 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-12-03 18:13:50,219 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 204 [2018-12-03 18:13:50,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:50,222 INFO L225 Difference]: With dead ends: 3020 [2018-12-03 18:13:50,222 INFO L226 Difference]: Without dead ends: 1575 [2018-12-03 18:13:50,225 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 343 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=8385, Invalid=8385, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 18:13:50,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1575 states. [2018-12-03 18:13:50,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1575 to 1575. [2018-12-03 18:13:50,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1575 states. [2018-12-03 18:13:50,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1575 states to 1575 states and 1651 transitions. [2018-12-03 18:13:50,270 INFO L78 Accepts]: Start accepts. Automaton has 1575 states and 1651 transitions. Word has length 204 [2018-12-03 18:13:50,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:50,270 INFO L480 AbstractCegarLoop]: Abstraction has 1575 states and 1651 transitions. [2018-12-03 18:13:50,270 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-12-03 18:13:50,270 INFO L276 IsEmpty]: Start isEmpty. Operand 1575 states and 1651 transitions. [2018-12-03 18:13:50,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-12-03 18:13:50,273 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:50,273 INFO L402 BasicCegarLoop]: trace histogram [101, 100, 2, 1, 1, 1] [2018-12-03 18:13:50,273 INFO L423 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:50,273 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:50,273 INFO L82 PathProgramCache]: Analyzing trace with hash 499817456, now seen corresponding path program 65 times [2018-12-03 18:13:50,274 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:50,274 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:50,274 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:13:50,274 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:50,275 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:50,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:52,194 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 18:13:52,195 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:52,195 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:52,195 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:52,195 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:52,195 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:52,195 INFO 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 18:13:52,204 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:13:52,204 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:13:52,327 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:13:52,327 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:13:52,330 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:53,001 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 18:13:53,001 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:53,932 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 18:13:53,951 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:53,952 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 22, 22] total 107 [2018-12-03 18:13:53,952 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:53,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-12-03 18:13:53,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-12-03 18:13:53,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3071, Invalid=8271, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 18:13:53,954 INFO L87 Difference]: Start difference. First operand 1575 states and 1651 transitions. Second operand 87 states. [2018-12-03 18:13:58,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:58,250 INFO L93 Difference]: Finished difference Result 3117 states and 3290 transitions. [2018-12-03 18:13:58,250 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2018-12-03 18:13:58,250 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 206 [2018-12-03 18:13:58,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:58,253 INFO L225 Difference]: With dead ends: 3117 [2018-12-03 18:13:58,253 INFO L226 Difference]: Without dead ends: 1672 [2018-12-03 18:13:58,257 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 560 GetRequests, 371 SyntacticMatches, 0 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6950 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=11185, Invalid=25105, Unknown=0, NotChecked=0, Total=36290 [2018-12-03 18:13:58,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1672 states. [2018-12-03 18:13:58,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1672 to 1653. [2018-12-03 18:13:58,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1653 states. [2018-12-03 18:13:58,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1653 states to 1653 states and 1731 transitions. [2018-12-03 18:13:58,304 INFO L78 Accepts]: Start accepts. Automaton has 1653 states and 1731 transitions. Word has length 206 [2018-12-03 18:13:58,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:58,304 INFO L480 AbstractCegarLoop]: Abstraction has 1653 states and 1731 transitions. [2018-12-03 18:13:58,304 INFO L481 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-12-03 18:13:58,304 INFO L276 IsEmpty]: Start isEmpty. Operand 1653 states and 1731 transitions. [2018-12-03 18:13:58,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2018-12-03 18:13:58,307 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:58,307 INFO L402 BasicCegarLoop]: trace histogram [102, 101, 2, 1, 1, 1] [2018-12-03 18:13:58,307 INFO L423 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:58,307 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:58,308 INFO L82 PathProgramCache]: Analyzing trace with hash 1440334058, now seen corresponding path program 66 times [2018-12-03 18:13:58,308 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:58,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:58,309 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:13:58,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:58,309 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:58,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:00,197 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 18:14:00,197 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:00,197 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:00,197 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:00,197 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:00,197 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:00,197 INFO 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 18:14:00,206 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:14:00,206 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:14:00,281 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:14:00,282 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:00,286 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:00,320 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 18:14:00,320 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:05,223 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 18:14:05,243 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:05,243 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 133 [2018-12-03 18:14:05,243 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:05,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-12-03 18:14:05,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-12-03 18:14:05,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 18:14:05,245 INFO L87 Difference]: Start difference. First operand 1653 states and 1731 transitions. Second operand 68 states. [2018-12-03 18:14:05,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:05,415 INFO L93 Difference]: Finished difference Result 3176 states and 3332 transitions. [2018-12-03 18:14:05,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-12-03 18:14:05,415 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 208 [2018-12-03 18:14:05,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:05,418 INFO L225 Difference]: With dead ends: 3176 [2018-12-03 18:14:05,419 INFO L226 Difference]: Without dead ends: 1655 [2018-12-03 18:14:05,421 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 349 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 18:14:05,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1655 states. [2018-12-03 18:14:05,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1655 to 1655. [2018-12-03 18:14:05,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1655 states. [2018-12-03 18:14:05,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1655 states to 1655 states and 1733 transitions. [2018-12-03 18:14:05,471 INFO L78 Accepts]: Start accepts. Automaton has 1655 states and 1733 transitions. Word has length 208 [2018-12-03 18:14:05,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:05,471 INFO L480 AbstractCegarLoop]: Abstraction has 1655 states and 1733 transitions. [2018-12-03 18:14:05,471 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-12-03 18:14:05,471 INFO L276 IsEmpty]: Start isEmpty. Operand 1655 states and 1733 transitions. [2018-12-03 18:14:05,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2018-12-03 18:14:05,474 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:05,474 INFO L402 BasicCegarLoop]: trace histogram [103, 102, 2, 1, 1, 1] [2018-12-03 18:14:05,474 INFO L423 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:05,474 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:05,475 INFO L82 PathProgramCache]: Analyzing trace with hash -618862876, now seen corresponding path program 67 times [2018-12-03 18:14:05,475 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:05,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:05,476 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:05,476 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:05,476 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:05,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:07,464 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 18:14:07,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:07,465 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:07,465 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:07,465 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:07,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:07,465 INFO 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 18:14:07,473 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:07,473 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:14:07,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:07,558 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:07,595 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 18:14:07,595 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:12,890 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 18:14:12,910 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:12,911 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 135 [2018-12-03 18:14:12,911 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:12,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-12-03 18:14:12,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-12-03 18:14:12,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9180, Invalid=9180, Unknown=0, NotChecked=0, Total=18360 [2018-12-03 18:14:12,913 INFO L87 Difference]: Start difference. First operand 1655 states and 1733 transitions. Second operand 69 states. [2018-12-03 18:14:13,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:13,099 INFO L93 Difference]: Finished difference Result 3178 states and 3334 transitions. [2018-12-03 18:14:13,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 18:14:13,100 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 210 [2018-12-03 18:14:13,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:13,102 INFO L225 Difference]: With dead ends: 3178 [2018-12-03 18:14:13,102 INFO L226 Difference]: Without dead ends: 1657 [2018-12-03 18:14:13,105 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 352 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=9180, Invalid=9180, Unknown=0, NotChecked=0, Total=18360 [2018-12-03 18:14:13,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1657 states. [2018-12-03 18:14:13,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1657 to 1657. [2018-12-03 18:14:13,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1657 states. [2018-12-03 18:14:13,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1657 states to 1657 states and 1735 transitions. [2018-12-03 18:14:13,155 INFO L78 Accepts]: Start accepts. Automaton has 1657 states and 1735 transitions. Word has length 210 [2018-12-03 18:14:13,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:13,155 INFO L480 AbstractCegarLoop]: Abstraction has 1657 states and 1735 transitions. [2018-12-03 18:14:13,156 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-12-03 18:14:13,156 INFO L276 IsEmpty]: Start isEmpty. Operand 1657 states and 1735 transitions. [2018-12-03 18:14:13,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-12-03 18:14:13,158 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:13,159 INFO L402 BasicCegarLoop]: trace histogram [104, 103, 2, 1, 1, 1] [2018-12-03 18:14:13,159 INFO L423 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:13,159 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:13,159 INFO L82 PathProgramCache]: Analyzing trace with hash 472807006, now seen corresponding path program 68 times [2018-12-03 18:14:13,159 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:13,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:13,160 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:13,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:13,160 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:13,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:15,048 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 18:14:15,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:15,048 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:15,048 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:15,048 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:15,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:15,049 INFO 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 18:14:15,057 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:14:15,058 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:14:15,180 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:14:15,180 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:15,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:15,920 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 18:14:15,920 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:16,914 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 18:14:16,935 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:16,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 23, 23] total 112 [2018-12-03 18:14:16,935 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:16,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-12-03 18:14:16,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-12-03 18:14:16,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3360, Invalid=9072, Unknown=0, NotChecked=0, Total=12432 [2018-12-03 18:14:16,938 INFO L87 Difference]: Start difference. First operand 1657 states and 1735 transitions. Second operand 91 states. [2018-12-03 18:14:21,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:21,746 INFO L93 Difference]: Finished difference Result 3276 states and 3452 transitions. [2018-12-03 18:14:21,746 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-12-03 18:14:21,746 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 212 [2018-12-03 18:14:21,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:21,748 INFO L225 Difference]: With dead ends: 3276 [2018-12-03 18:14:21,748 INFO L226 Difference]: Without dead ends: 1755 [2018-12-03 18:14:21,751 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 579 GetRequests, 381 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7634 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=12256, Invalid=27544, Unknown=0, NotChecked=0, Total=39800 [2018-12-03 18:14:21,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1755 states. [2018-12-03 18:14:21,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1755 to 1735. [2018-12-03 18:14:21,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1735 states. [2018-12-03 18:14:21,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1735 states to 1735 states and 1815 transitions. [2018-12-03 18:14:21,788 INFO L78 Accepts]: Start accepts. Automaton has 1735 states and 1815 transitions. Word has length 212 [2018-12-03 18:14:21,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:21,789 INFO L480 AbstractCegarLoop]: Abstraction has 1735 states and 1815 transitions. [2018-12-03 18:14:21,789 INFO L481 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-12-03 18:14:21,789 INFO L276 IsEmpty]: Start isEmpty. Operand 1735 states and 1815 transitions. [2018-12-03 18:14:21,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2018-12-03 18:14:21,791 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:21,791 INFO L402 BasicCegarLoop]: trace histogram [105, 104, 2, 1, 1, 1] [2018-12-03 18:14:21,791 INFO L423 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:21,791 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:21,791 INFO L82 PathProgramCache]: Analyzing trace with hash -849807400, now seen corresponding path program 69 times [2018-12-03 18:14:21,791 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:21,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:21,792 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:21,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:21,792 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:21,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:23,913 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 18:14:23,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:23,913 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:23,913 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:23,913 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:23,914 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:23,914 INFO 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 18:14:23,924 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:14:23,924 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:14:24,006 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:14:24,006 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:24,011 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:24,049 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 18:14:24,050 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:29,421 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 18:14:29,440 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:29,440 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 139 [2018-12-03 18:14:29,440 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:29,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 18:14:29,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 18:14:29,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9730, Invalid=9730, Unknown=0, NotChecked=0, Total=19460 [2018-12-03 18:14:29,443 INFO L87 Difference]: Start difference. First operand 1735 states and 1815 transitions. Second operand 71 states. [2018-12-03 18:14:29,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:29,664 INFO L93 Difference]: Finished difference Result 3334 states and 3494 transitions. [2018-12-03 18:14:29,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 18:14:29,665 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 214 [2018-12-03 18:14:29,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:29,667 INFO L225 Difference]: With dead ends: 3334 [2018-12-03 18:14:29,667 INFO L226 Difference]: Without dead ends: 1737 [2018-12-03 18:14:29,670 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 358 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=9730, Invalid=9730, Unknown=0, NotChecked=0, Total=19460 [2018-12-03 18:14:29,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1737 states. [2018-12-03 18:14:29,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1737 to 1737. [2018-12-03 18:14:29,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1737 states. [2018-12-03 18:14:29,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1737 states to 1737 states and 1817 transitions. [2018-12-03 18:14:29,722 INFO L78 Accepts]: Start accepts. Automaton has 1737 states and 1817 transitions. Word has length 214 [2018-12-03 18:14:29,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:29,722 INFO L480 AbstractCegarLoop]: Abstraction has 1737 states and 1817 transitions. [2018-12-03 18:14:29,722 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 18:14:29,722 INFO L276 IsEmpty]: Start isEmpty. Operand 1737 states and 1817 transitions. [2018-12-03 18:14:29,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-12-03 18:14:29,725 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:29,725 INFO L402 BasicCegarLoop]: trace histogram [106, 105, 2, 1, 1, 1] [2018-12-03 18:14:29,726 INFO L423 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:29,726 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:29,726 INFO L82 PathProgramCache]: Analyzing trace with hash 63060562, now seen corresponding path program 70 times [2018-12-03 18:14:29,726 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:29,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:29,727 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:29,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:29,727 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:29,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:31,794 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 18:14:31,795 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:31,795 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:31,795 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:31,795 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:31,795 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:31,795 INFO 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 18:14:31,804 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:31,804 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:14:31,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:31,888 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:31,923 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 18:14:31,924 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:37,439 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 18:14:37,459 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:37,460 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 141 [2018-12-03 18:14:37,460 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:37,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-12-03 18:14:37,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-12-03 18:14:37,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10011, Invalid=10011, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 18:14:37,461 INFO L87 Difference]: Start difference. First operand 1737 states and 1817 transitions. Second operand 72 states. [2018-12-03 18:14:37,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:37,643 INFO L93 Difference]: Finished difference Result 3336 states and 3496 transitions. [2018-12-03 18:14:37,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-03 18:14:37,644 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 216 [2018-12-03 18:14:37,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:37,646 INFO L225 Difference]: With dead ends: 3336 [2018-12-03 18:14:37,646 INFO L226 Difference]: Without dead ends: 1739 [2018-12-03 18:14:37,648 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 361 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=10011, Invalid=10011, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 18:14:37,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1739 states. [2018-12-03 18:14:37,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1739 to 1739. [2018-12-03 18:14:37,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1739 states. [2018-12-03 18:14:37,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1739 states to 1739 states and 1819 transitions. [2018-12-03 18:14:37,685 INFO L78 Accepts]: Start accepts. Automaton has 1739 states and 1819 transitions. Word has length 216 [2018-12-03 18:14:37,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:37,686 INFO L480 AbstractCegarLoop]: Abstraction has 1739 states and 1819 transitions. [2018-12-03 18:14:37,686 INFO L481 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-12-03 18:14:37,686 INFO L276 IsEmpty]: Start isEmpty. Operand 1739 states and 1819 transitions. [2018-12-03 18:14:37,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-12-03 18:14:37,688 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:37,688 INFO L402 BasicCegarLoop]: trace histogram [107, 106, 2, 1, 1, 1] [2018-12-03 18:14:37,688 INFO L423 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:37,688 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:37,688 INFO L82 PathProgramCache]: Analyzing trace with hash 1155843660, now seen corresponding path program 71 times [2018-12-03 18:14:37,688 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:37,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:37,689 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:37,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:37,689 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:37,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:39,641 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 18:14:39,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:39,642 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:39,642 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:39,642 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:39,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:39,642 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 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 18:14:39,651 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:14:39,652 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:14:39,795 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:14:39,795 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:39,798 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:40,588 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 18:14:40,589 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:41,684 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 18:14:41,703 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:41,704 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 24, 24] total 117 [2018-12-03 18:14:41,704 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:41,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 18:14:41,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 18:14:41,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3662, Invalid=9910, Unknown=0, NotChecked=0, Total=13572 [2018-12-03 18:14:41,706 INFO L87 Difference]: Start difference. First operand 1739 states and 1819 transitions. Second operand 95 states. [2018-12-03 18:14:47,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:47,104 INFO L93 Difference]: Finished difference Result 3435 states and 3614 transitions. [2018-12-03 18:14:47,104 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2018-12-03 18:14:47,104 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 218 [2018-12-03 18:14:47,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:47,106 INFO L225 Difference]: With dead ends: 3435 [2018-12-03 18:14:47,107 INFO L226 Difference]: Without dead ends: 1838 [2018-12-03 18:14:47,111 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 391 SyntacticMatches, 0 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8350 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=13376, Invalid=30096, Unknown=0, NotChecked=0, Total=43472 [2018-12-03 18:14:47,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1838 states. [2018-12-03 18:14:47,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1838 to 1817. [2018-12-03 18:14:47,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1817 states. [2018-12-03 18:14:47,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1817 states to 1817 states and 1899 transitions. [2018-12-03 18:14:47,168 INFO L78 Accepts]: Start accepts. Automaton has 1817 states and 1899 transitions. Word has length 218 [2018-12-03 18:14:47,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:47,168 INFO L480 AbstractCegarLoop]: Abstraction has 1817 states and 1899 transitions. [2018-12-03 18:14:47,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 18:14:47,168 INFO L276 IsEmpty]: Start isEmpty. Operand 1817 states and 1899 transitions. [2018-12-03 18:14:47,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2018-12-03 18:14:47,171 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:47,171 INFO L402 BasicCegarLoop]: trace histogram [108, 107, 2, 1, 1, 1] [2018-12-03 18:14:47,171 INFO L423 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:47,171 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:47,172 INFO L82 PathProgramCache]: Analyzing trace with hash 829637702, now seen corresponding path program 72 times [2018-12-03 18:14:47,172 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:47,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:47,173 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:47,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:47,173 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:47,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:49,434 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 18:14:49,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:49,435 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:49,435 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:49,435 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:49,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:49,435 INFO 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 18:14:49,444 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:14:49,444 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:14:49,529 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:14:49,529 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:49,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:49,571 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 18:14:49,571 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:55,364 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 18:14:55,383 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:55,384 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 145 [2018-12-03 18:14:55,384 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:55,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-03 18:14:55,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-03 18:14:55,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10585, Invalid=10585, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 18:14:55,386 INFO L87 Difference]: Start difference. First operand 1817 states and 1899 transitions. Second operand 74 states. [2018-12-03 18:14:55,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:55,631 INFO L93 Difference]: Finished difference Result 3492 states and 3656 transitions. [2018-12-03 18:14:55,631 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-12-03 18:14:55,631 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 220 [2018-12-03 18:14:55,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:55,633 INFO L225 Difference]: With dead ends: 3492 [2018-12-03 18:14:55,633 INFO L226 Difference]: Without dead ends: 1819 [2018-12-03 18:14:55,635 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 511 GetRequests, 367 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=10585, Invalid=10585, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 18:14:55,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1819 states. [2018-12-03 18:14:55,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1819 to 1819. [2018-12-03 18:14:55,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1819 states. [2018-12-03 18:14:55,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1819 states to 1819 states and 1901 transitions. [2018-12-03 18:14:55,671 INFO L78 Accepts]: Start accepts. Automaton has 1819 states and 1901 transitions. Word has length 220 [2018-12-03 18:14:55,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:55,671 INFO L480 AbstractCegarLoop]: Abstraction has 1819 states and 1901 transitions. [2018-12-03 18:14:55,671 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-03 18:14:55,671 INFO L276 IsEmpty]: Start isEmpty. Operand 1819 states and 1901 transitions. [2018-12-03 18:14:55,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-12-03 18:14:55,673 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:55,673 INFO L402 BasicCegarLoop]: trace histogram [109, 108, 2, 1, 1, 1] [2018-12-03 18:14:55,673 INFO L423 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:55,674 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:55,674 INFO L82 PathProgramCache]: Analyzing trace with hash -971291840, now seen corresponding path program 73 times [2018-12-03 18:14:55,674 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:55,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:55,675 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:55,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:55,675 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:55,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:57,680 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 18:14:57,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:57,681 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:57,681 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:57,681 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:57,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:57,681 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:14:57,690 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:57,690 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:14:57,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:57,778 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:57,818 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 18:14:57,818 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:03,932 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 18:15:03,951 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:03,951 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 147 [2018-12-03 18:15:03,951 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:03,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-03 18:15:03,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-03 18:15:03,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10878, Invalid=10878, Unknown=0, NotChecked=0, Total=21756 [2018-12-03 18:15:03,953 INFO L87 Difference]: Start difference. First operand 1819 states and 1901 transitions. Second operand 75 states. [2018-12-03 18:15:04,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:04,201 INFO L93 Difference]: Finished difference Result 3494 states and 3658 transitions. [2018-12-03 18:15:04,201 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 18:15:04,202 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 222 [2018-12-03 18:15:04,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:04,204 INFO L225 Difference]: With dead ends: 3494 [2018-12-03 18:15:04,204 INFO L226 Difference]: Without dead ends: 1821 [2018-12-03 18:15:04,207 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 370 SyntacticMatches, 0 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=10878, Invalid=10878, Unknown=0, NotChecked=0, Total=21756 [2018-12-03 18:15:04,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1821 states. [2018-12-03 18:15:04,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1821 to 1821. [2018-12-03 18:15:04,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1821 states. [2018-12-03 18:15:04,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1821 states to 1821 states and 1903 transitions. [2018-12-03 18:15:04,250 INFO L78 Accepts]: Start accepts. Automaton has 1821 states and 1903 transitions. Word has length 222 [2018-12-03 18:15:04,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:04,250 INFO L480 AbstractCegarLoop]: Abstraction has 1821 states and 1903 transitions. [2018-12-03 18:15:04,250 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-03 18:15:04,251 INFO L276 IsEmpty]: Start isEmpty. Operand 1821 states and 1903 transitions. [2018-12-03 18:15:04,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2018-12-03 18:15:04,252 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:04,253 INFO L402 BasicCegarLoop]: trace histogram [110, 109, 2, 1, 1, 1] [2018-12-03 18:15:04,253 INFO L423 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:04,253 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:04,253 INFO L82 PathProgramCache]: Analyzing trace with hash -792761414, now seen corresponding path program 74 times [2018-12-03 18:15:04,253 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:04,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:04,254 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:04,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:04,254 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:04,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:06,322 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 18:15:06,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:06,322 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:06,322 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:06,322 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:06,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:06,322 INFO 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 18:15:06,331 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:15:06,331 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:15:06,451 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:15:06,451 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:06,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:07,317 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 18:15:07,317 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:08,721 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 18:15:08,741 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:08,741 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 25, 25] total 122 [2018-12-03 18:15:08,741 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:08,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-12-03 18:15:08,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-12-03 18:15:08,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3977, Invalid=10785, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 18:15:08,743 INFO L87 Difference]: Start difference. First operand 1821 states and 1903 transitions. Second operand 99 states. [2018-12-03 18:15:14,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:14,241 INFO L93 Difference]: Finished difference Result 3594 states and 3776 transitions. [2018-12-03 18:15:14,241 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-12-03 18:15:14,241 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 224 [2018-12-03 18:15:14,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:14,243 INFO L225 Difference]: With dead ends: 3594 [2018-12-03 18:15:14,243 INFO L226 Difference]: Without dead ends: 1921 [2018-12-03 18:15:14,249 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 617 GetRequests, 401 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9098 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=14545, Invalid=32761, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 18:15:14,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1921 states. [2018-12-03 18:15:14,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1921 to 1899. [2018-12-03 18:15:14,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1899 states. [2018-12-03 18:15:14,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1899 states to 1899 states and 1983 transitions. [2018-12-03 18:15:14,283 INFO L78 Accepts]: Start accepts. Automaton has 1899 states and 1983 transitions. Word has length 224 [2018-12-03 18:15:14,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:14,283 INFO L480 AbstractCegarLoop]: Abstraction has 1899 states and 1983 transitions. [2018-12-03 18:15:14,284 INFO L481 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-12-03 18:15:14,284 INFO L276 IsEmpty]: Start isEmpty. Operand 1899 states and 1983 transitions. [2018-12-03 18:15:14,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2018-12-03 18:15:14,285 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:14,286 INFO L402 BasicCegarLoop]: trace histogram [111, 110, 2, 1, 1, 1] [2018-12-03 18:15:14,286 INFO L423 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:14,286 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:14,286 INFO L82 PathProgramCache]: Analyzing trace with hash -771586508, now seen corresponding path program 75 times [2018-12-03 18:15:14,286 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:14,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:14,287 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:14,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:14,287 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:14,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:16,410 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 18:15:16,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:16,410 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:16,410 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:16,410 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:16,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:16,411 INFO 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 18:15:16,419 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:15:16,419 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:15:16,504 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:15:16,505 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:16,509 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:16,550 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 18:15:16,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:22,658 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 18:15:22,677 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:22,678 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 151 [2018-12-03 18:15:22,678 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:22,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 18:15:22,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 18:15:22,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11476, Invalid=11476, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 18:15:22,680 INFO L87 Difference]: Start difference. First operand 1899 states and 1983 transitions. Second operand 77 states. [2018-12-03 18:15:22,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:22,920 INFO L93 Difference]: Finished difference Result 3650 states and 3818 transitions. [2018-12-03 18:15:22,920 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 18:15:22,920 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 226 [2018-12-03 18:15:22,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:22,922 INFO L225 Difference]: With dead ends: 3650 [2018-12-03 18:15:22,922 INFO L226 Difference]: Without dead ends: 1901 [2018-12-03 18:15:22,924 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 376 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=11476, Invalid=11476, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 18:15:22,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1901 states. [2018-12-03 18:15:22,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1901 to 1901. [2018-12-03 18:15:22,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1901 states. [2018-12-03 18:15:22,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1901 states to 1901 states and 1985 transitions. [2018-12-03 18:15:22,961 INFO L78 Accepts]: Start accepts. Automaton has 1901 states and 1985 transitions. Word has length 226 [2018-12-03 18:15:22,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:22,961 INFO L480 AbstractCegarLoop]: Abstraction has 1901 states and 1985 transitions. [2018-12-03 18:15:22,961 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 18:15:22,962 INFO L276 IsEmpty]: Start isEmpty. Operand 1901 states and 1985 transitions. [2018-12-03 18:15:22,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2018-12-03 18:15:22,963 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:22,964 INFO L402 BasicCegarLoop]: trace histogram [112, 111, 2, 1, 1, 1] [2018-12-03 18:15:22,964 INFO L423 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:22,964 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:22,964 INFO L82 PathProgramCache]: Analyzing trace with hash 621404590, now seen corresponding path program 76 times [2018-12-03 18:15:22,964 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:22,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:22,965 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:22,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:22,965 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:23,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:25,472 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 18:15:25,472 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:25,472 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:25,472 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:25,472 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:25,473 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:25,473 INFO 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 18:15:25,481 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:25,481 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:15:25,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:25,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:25,612 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 18:15:25,612 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:31,961 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 18:15:31,980 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:31,980 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 153 [2018-12-03 18:15:31,980 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:31,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-12-03 18:15:31,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-12-03 18:15:31,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11781, Invalid=11781, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 18:15:31,983 INFO L87 Difference]: Start difference. First operand 1901 states and 1985 transitions. Second operand 78 states. [2018-12-03 18:15:32,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:32,165 INFO L93 Difference]: Finished difference Result 3652 states and 3820 transitions. [2018-12-03 18:15:32,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2018-12-03 18:15:32,165 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 228 [2018-12-03 18:15:32,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:32,167 INFO L225 Difference]: With dead ends: 3652 [2018-12-03 18:15:32,167 INFO L226 Difference]: Without dead ends: 1903 [2018-12-03 18:15:32,169 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 531 GetRequests, 379 SyntacticMatches, 0 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=11781, Invalid=11781, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 18:15:32,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1903 states. [2018-12-03 18:15:32,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1903 to 1903. [2018-12-03 18:15:32,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1903 states. [2018-12-03 18:15:32,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1903 states to 1903 states and 1987 transitions. [2018-12-03 18:15:32,210 INFO L78 Accepts]: Start accepts. Automaton has 1903 states and 1987 transitions. Word has length 228 [2018-12-03 18:15:32,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:32,210 INFO L480 AbstractCegarLoop]: Abstraction has 1903 states and 1987 transitions. [2018-12-03 18:15:32,210 INFO L481 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-12-03 18:15:32,210 INFO L276 IsEmpty]: Start isEmpty. Operand 1903 states and 1987 transitions. [2018-12-03 18:15:32,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2018-12-03 18:15:32,212 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:32,212 INFO L402 BasicCegarLoop]: trace histogram [113, 112, 2, 1, 1, 1] [2018-12-03 18:15:32,213 INFO L423 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:32,213 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:32,213 INFO L82 PathProgramCache]: Analyzing trace with hash -743946584, now seen corresponding path program 77 times [2018-12-03 18:15:32,213 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:32,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:32,214 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:32,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:32,214 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:32,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:34,753 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 18:15:34,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:34,753 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:34,753 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:34,754 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:34,754 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:34,754 INFO 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 18:15:34,764 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:15:34,764 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:15:34,883 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:15:34,883 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:34,886 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:35,874 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 18:15:35,875 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:37,195 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 18:15:37,214 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:37,214 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 26, 26] total 127 [2018-12-03 18:15:37,214 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:37,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 103 states [2018-12-03 18:15:37,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2018-12-03 18:15:37,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4305, Invalid=11697, Unknown=0, NotChecked=0, Total=16002 [2018-12-03 18:15:37,217 INFO L87 Difference]: Start difference. First operand 1903 states and 1987 transitions. Second operand 103 states. [2018-12-03 18:15:42,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:42,676 INFO L93 Difference]: Finished difference Result 3753 states and 3938 transitions. [2018-12-03 18:15:42,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2018-12-03 18:15:42,676 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 230 [2018-12-03 18:15:42,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:42,678 INFO L225 Difference]: With dead ends: 3753 [2018-12-03 18:15:42,678 INFO L226 Difference]: Without dead ends: 2004 [2018-12-03 18:15:42,681 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 636 GetRequests, 411 SyntacticMatches, 0 SemanticMatches, 225 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9878 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=15763, Invalid=35539, Unknown=0, NotChecked=0, Total=51302 [2018-12-03 18:15:42,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2004 states. [2018-12-03 18:15:42,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2004 to 1981. [2018-12-03 18:15:42,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1981 states. [2018-12-03 18:15:42,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1981 states to 1981 states and 2067 transitions. [2018-12-03 18:15:42,719 INFO L78 Accepts]: Start accepts. Automaton has 1981 states and 2067 transitions. Word has length 230 [2018-12-03 18:15:42,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:42,719 INFO L480 AbstractCegarLoop]: Abstraction has 1981 states and 2067 transitions. [2018-12-03 18:15:42,719 INFO L481 AbstractCegarLoop]: Interpolant automaton has 103 states. [2018-12-03 18:15:42,719 INFO L276 IsEmpty]: Start isEmpty. Operand 1981 states and 2067 transitions. [2018-12-03 18:15:42,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 233 [2018-12-03 18:15:42,721 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:42,721 INFO L402 BasicCegarLoop]: trace histogram [114, 113, 2, 1, 1, 1] [2018-12-03 18:15:42,721 INFO L423 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:42,721 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:42,721 INFO L82 PathProgramCache]: Analyzing trace with hash 1945673122, now seen corresponding path program 78 times [2018-12-03 18:15:42,721 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:42,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:42,722 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:42,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:42,722 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:42,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:45,038 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 18:15:45,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:45,038 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:45,039 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:45,039 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:45,039 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:45,039 INFO 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 18:15:45,047 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:15:45,048 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:15:45,134 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:15:45,135 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:45,139 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:45,183 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 18:15:45,183 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:51,786 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 18:15:51,806 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:51,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 157 [2018-12-03 18:15:51,806 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:51,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-03 18:15:51,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-03 18:15:51,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12403, Invalid=12403, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 18:15:51,809 INFO L87 Difference]: Start difference. First operand 1981 states and 2067 transitions. Second operand 80 states. [2018-12-03 18:15:52,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:52,089 INFO L93 Difference]: Finished difference Result 3808 states and 3980 transitions. [2018-12-03 18:15:52,089 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-12-03 18:15:52,089 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 232 [2018-12-03 18:15:52,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:52,091 INFO L225 Difference]: With dead ends: 3808 [2018-12-03 18:15:52,091 INFO L226 Difference]: Without dead ends: 1983 [2018-12-03 18:15:52,094 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 385 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=12403, Invalid=12403, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 18:15:52,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1983 states. [2018-12-03 18:15:52,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1983 to 1983. [2018-12-03 18:15:52,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1983 states. [2018-12-03 18:15:52,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1983 states to 1983 states and 2069 transitions. [2018-12-03 18:15:52,180 INFO L78 Accepts]: Start accepts. Automaton has 1983 states and 2069 transitions. Word has length 232 [2018-12-03 18:15:52,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:52,180 INFO L480 AbstractCegarLoop]: Abstraction has 1983 states and 2069 transitions. [2018-12-03 18:15:52,180 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-03 18:15:52,181 INFO L276 IsEmpty]: Start isEmpty. Operand 1983 states and 2069 transitions. [2018-12-03 18:15:52,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2018-12-03 18:15:52,183 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:52,183 INFO L402 BasicCegarLoop]: trace histogram [115, 114, 2, 1, 1, 1] [2018-12-03 18:15:52,184 INFO L423 AbstractCegarLoop]: === Iteration 82 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:52,184 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:52,184 INFO L82 PathProgramCache]: Analyzing trace with hash 847771036, now seen corresponding path program 79 times [2018-12-03 18:15:52,184 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:52,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:52,185 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:52,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:52,185 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:52,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:54,805 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 18:15:54,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:54,806 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:54,806 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:54,806 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:54,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:54,806 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 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 18:15:54,815 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:54,815 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:15:54,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:54,907 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:54,952 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 18:15:54,953 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:01,780 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 18:16:01,799 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:01,799 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 159 [2018-12-03 18:16:01,799 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:01,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-12-03 18:16:01,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-12-03 18:16:01,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12720, Invalid=12720, Unknown=0, NotChecked=0, Total=25440 [2018-12-03 18:16:01,803 INFO L87 Difference]: Start difference. First operand 1983 states and 2069 transitions. Second operand 81 states. [2018-12-03 18:16:02,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:02,061 INFO L93 Difference]: Finished difference Result 3810 states and 3982 transitions. [2018-12-03 18:16:02,062 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 18:16:02,062 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 234 [2018-12-03 18:16:02,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:02,064 INFO L225 Difference]: With dead ends: 3810 [2018-12-03 18:16:02,064 INFO L226 Difference]: Without dead ends: 1985 [2018-12-03 18:16:02,066 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 388 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=12720, Invalid=12720, Unknown=0, NotChecked=0, Total=25440 [2018-12-03 18:16:02,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1985 states. [2018-12-03 18:16:02,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1985 to 1985. [2018-12-03 18:16:02,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1985 states. [2018-12-03 18:16:02,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1985 states to 1985 states and 2071 transitions. [2018-12-03 18:16:02,103 INFO L78 Accepts]: Start accepts. Automaton has 1985 states and 2071 transitions. Word has length 234 [2018-12-03 18:16:02,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:02,103 INFO L480 AbstractCegarLoop]: Abstraction has 1985 states and 2071 transitions. [2018-12-03 18:16:02,103 INFO L481 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-12-03 18:16:02,104 INFO L276 IsEmpty]: Start isEmpty. Operand 1985 states and 2071 transitions. [2018-12-03 18:16:02,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2018-12-03 18:16:02,106 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:02,106 INFO L402 BasicCegarLoop]: trace histogram [116, 115, 2, 1, 1, 1] [2018-12-03 18:16:02,106 INFO L423 AbstractCegarLoop]: === Iteration 83 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:02,106 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:02,106 INFO L82 PathProgramCache]: Analyzing trace with hash -1969146090, now seen corresponding path program 80 times [2018-12-03 18:16:02,106 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:02,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:02,107 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:02,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:02,107 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:02,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:04,514 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 18:16:04,514 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:04,514 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:04,515 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:04,515 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:04,515 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:04,515 INFO 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 18:16:04,524 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:04,524 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:04,642 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:16:04,642 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:04,646 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:05,755 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 18:16:05,755 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:07,140 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 18:16:07,161 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:07,161 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 27, 27] total 132 [2018-12-03 18:16:07,161 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:07,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-03 18:16:07,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-03 18:16:07,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4646, Invalid=12646, Unknown=0, NotChecked=0, Total=17292 [2018-12-03 18:16:07,164 INFO L87 Difference]: Start difference. First operand 1985 states and 2071 transitions. Second operand 107 states. [2018-12-03 18:16:13,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:13,268 INFO L93 Difference]: Finished difference Result 3912 states and 4100 transitions. [2018-12-03 18:16:13,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2018-12-03 18:16:13,269 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 236 [2018-12-03 18:16:13,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:13,271 INFO L225 Difference]: With dead ends: 3912 [2018-12-03 18:16:13,271 INFO L226 Difference]: Without dead ends: 2087 [2018-12-03 18:16:13,275 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 421 SyntacticMatches, 0 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10690 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=17030, Invalid=38430, Unknown=0, NotChecked=0, Total=55460 [2018-12-03 18:16:13,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2087 states. [2018-12-03 18:16:13,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2087 to 2063. [2018-12-03 18:16:13,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2063 states. [2018-12-03 18:16:13,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2063 states to 2063 states and 2151 transitions. [2018-12-03 18:16:13,311 INFO L78 Accepts]: Start accepts. Automaton has 2063 states and 2151 transitions. Word has length 236 [2018-12-03 18:16:13,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:13,311 INFO L480 AbstractCegarLoop]: Abstraction has 2063 states and 2151 transitions. [2018-12-03 18:16:13,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-03 18:16:13,311 INFO L276 IsEmpty]: Start isEmpty. Operand 2063 states and 2151 transitions. [2018-12-03 18:16:13,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2018-12-03 18:16:13,313 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:13,313 INFO L402 BasicCegarLoop]: trace histogram [117, 116, 2, 1, 1, 1] [2018-12-03 18:16:13,313 INFO L423 AbstractCegarLoop]: === Iteration 84 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:13,314 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:13,314 INFO L82 PathProgramCache]: Analyzing trace with hash 526346896, now seen corresponding path program 81 times [2018-12-03 18:16:13,314 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:13,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:13,314 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:13,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:13,315 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:13,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:15,940 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 18:16:15,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:15,940 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:15,940 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:15,940 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:15,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:15,940 INFO 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 18:16:15,949 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:16:15,949 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:16:16,038 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:16:16,038 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:16,043 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:16,083 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 18:16:16,083 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:23,233 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 18:16:23,252 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:23,252 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82, 82] total 163 [2018-12-03 18:16:23,253 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:23,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 18:16:23,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 18:16:23,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13366, Invalid=13366, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 18:16:23,255 INFO L87 Difference]: Start difference. First operand 2063 states and 2151 transitions. Second operand 83 states. [2018-12-03 18:16:23,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:23,453 INFO L93 Difference]: Finished difference Result 3966 states and 4142 transitions. [2018-12-03 18:16:23,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 18:16:23,454 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 238 [2018-12-03 18:16:23,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:23,456 INFO L225 Difference]: With dead ends: 3966 [2018-12-03 18:16:23,456 INFO L226 Difference]: Without dead ends: 2065 [2018-12-03 18:16:23,459 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 18:16:23,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2065 states. [2018-12-03 18:16:23,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2065 to 2065. [2018-12-03 18:16:23,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2065 states. [2018-12-03 18:16:23,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2065 states to 2065 states and 2153 transitions. [2018-12-03 18:16:23,501 INFO L78 Accepts]: Start accepts. Automaton has 2065 states and 2153 transitions. Word has length 238 [2018-12-03 18:16:23,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:23,501 INFO L480 AbstractCegarLoop]: Abstraction has 2065 states and 2153 transitions. [2018-12-03 18:16:23,501 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 18:16:23,502 INFO L276 IsEmpty]: Start isEmpty. Operand 2065 states and 2153 transitions. [2018-12-03 18:16:23,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2018-12-03 18:16:23,504 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:23,504 INFO L402 BasicCegarLoop]: trace histogram [118, 117, 2, 1, 1, 1] [2018-12-03 18:16:23,504 INFO L423 AbstractCegarLoop]: === Iteration 85 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:23,504 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:23,504 INFO L82 PathProgramCache]: Analyzing trace with hash 1571249930, now seen corresponding path program 82 times [2018-12-03 18:16:23,505 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:23,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:23,505 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:23,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:23,506 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:23,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:26,250 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 18:16:26,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:26,250 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:26,251 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:26,251 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:26,251 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:26,251 INFO 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 18:16:26,260 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:26,260 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:26,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:26,353 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:26,401 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 18:16:26,402 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:33,724 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 18:16:33,743 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:33,743 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 165 [2018-12-03 18:16:33,743 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:33,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 84 states [2018-12-03 18:16:33,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2018-12-03 18:16:33,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13695, Invalid=13695, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 18:16:33,747 INFO L87 Difference]: Start difference. First operand 2065 states and 2153 transitions. Second operand 84 states. [2018-12-03 18:16:33,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:33,929 INFO L93 Difference]: Finished difference Result 3968 states and 4144 transitions. [2018-12-03 18:16:33,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-12-03 18:16:33,929 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 240 [2018-12-03 18:16:33,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:33,931 INFO L225 Difference]: With dead ends: 3968 [2018-12-03 18:16:33,931 INFO L226 Difference]: Without dead ends: 2067 [2018-12-03 18:16:33,933 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 561 GetRequests, 397 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=13695, Invalid=13695, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 18:16:33,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2067 states. [2018-12-03 18:16:33,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2067 to 2067. [2018-12-03 18:16:33,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2067 states. [2018-12-03 18:16:33,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2067 states to 2067 states and 2155 transitions. [2018-12-03 18:16:33,975 INFO L78 Accepts]: Start accepts. Automaton has 2067 states and 2155 transitions. Word has length 240 [2018-12-03 18:16:33,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:33,975 INFO L480 AbstractCegarLoop]: Abstraction has 2067 states and 2155 transitions. [2018-12-03 18:16:33,975 INFO L481 AbstractCegarLoop]: Interpolant automaton has 84 states. [2018-12-03 18:16:33,976 INFO L276 IsEmpty]: Start isEmpty. Operand 2067 states and 2155 transitions. [2018-12-03 18:16:33,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2018-12-03 18:16:33,978 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:33,979 INFO L402 BasicCegarLoop]: trace histogram [119, 118, 2, 1, 1, 1] [2018-12-03 18:16:33,979 INFO L423 AbstractCegarLoop]: === Iteration 86 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:33,979 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:33,979 INFO L82 PathProgramCache]: Analyzing trace with hash 700718340, now seen corresponding path program 83 times [2018-12-03 18:16:33,979 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:33,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:33,980 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:33,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:33,981 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:34,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:36,699 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 18:16:36,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:36,699 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:36,699 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:36,700 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:36,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:36,700 INFO 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 18:16:36,709 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:36,709 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:36,828 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:16:36,828 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:36,831 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:37,882 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 18:16:37,882 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:39,444 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 18:16:39,464 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:39,464 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 28, 28] total 137 [2018-12-03 18:16:39,465 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:39,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 111 states [2018-12-03 18:16:39,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2018-12-03 18:16:39,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5000, Invalid=13632, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 18:16:39,467 INFO L87 Difference]: Start difference. First operand 2067 states and 2155 transitions. Second operand 111 states. [2018-12-03 18:16:46,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:46,057 INFO L93 Difference]: Finished difference Result 4071 states and 4262 transitions. [2018-12-03 18:16:46,058 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2018-12-03 18:16:46,058 INFO L78 Accepts]: Start accepts. Automaton has 111 states. Word has length 242 [2018-12-03 18:16:46,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:46,060 INFO L225 Difference]: With dead ends: 4071 [2018-12-03 18:16:46,060 INFO L226 Difference]: Without dead ends: 2170 [2018-12-03 18:16:46,063 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 674 GetRequests, 431 SyntacticMatches, 0 SemanticMatches, 243 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11534 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=18346, Invalid=41434, Unknown=0, NotChecked=0, Total=59780 [2018-12-03 18:16:46,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2170 states. [2018-12-03 18:16:46,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2170 to 2145. [2018-12-03 18:16:46,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2145 states. [2018-12-03 18:16:46,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2145 states to 2145 states and 2235 transitions. [2018-12-03 18:16:46,104 INFO L78 Accepts]: Start accepts. Automaton has 2145 states and 2235 transitions. Word has length 242 [2018-12-03 18:16:46,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:46,104 INFO L480 AbstractCegarLoop]: Abstraction has 2145 states and 2235 transitions. [2018-12-03 18:16:46,104 INFO L481 AbstractCegarLoop]: Interpolant automaton has 111 states. [2018-12-03 18:16:46,104 INFO L276 IsEmpty]: Start isEmpty. Operand 2145 states and 2235 transitions. [2018-12-03 18:16:46,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2018-12-03 18:16:46,107 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:46,107 INFO L402 BasicCegarLoop]: trace histogram [120, 119, 2, 1, 1, 1] [2018-12-03 18:16:46,108 INFO L423 AbstractCegarLoop]: === Iteration 87 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:46,108 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:46,108 INFO L82 PathProgramCache]: Analyzing trace with hash 1834536190, now seen corresponding path program 84 times [2018-12-03 18:16:46,108 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:46,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:46,109 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:46,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:46,109 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:46,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:48,680 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 18:16:48,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:48,681 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:48,681 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:48,681 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:48,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:48,681 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:16:48,693 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:16:48,693 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:16:48,785 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:16:48,785 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:48,790 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:48,851 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 18:16:48,851 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:56,758 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 18:16:56,777 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:56,778 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 169 [2018-12-03 18:16:56,778 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:56,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-03 18:16:56,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-03 18:16:56,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14365, Invalid=14365, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 18:16:56,781 INFO L87 Difference]: Start difference. First operand 2145 states and 2235 transitions. Second operand 86 states. [2018-12-03 18:16:56,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:56,983 INFO L93 Difference]: Finished difference Result 4124 states and 4304 transitions. [2018-12-03 18:16:56,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-03 18:16:56,983 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 244 [2018-12-03 18:16:56,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:56,985 INFO L225 Difference]: With dead ends: 4124 [2018-12-03 18:16:56,985 INFO L226 Difference]: Without dead ends: 2147 [2018-12-03 18:16:56,987 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 403 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=14365, Invalid=14365, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 18:16:56,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2147 states. [2018-12-03 18:16:57,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2147 to 2147. [2018-12-03 18:16:57,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2147 states. [2018-12-03 18:16:57,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2147 states to 2147 states and 2237 transitions. [2018-12-03 18:16:57,026 INFO L78 Accepts]: Start accepts. Automaton has 2147 states and 2237 transitions. Word has length 244 [2018-12-03 18:16:57,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:57,026 INFO L480 AbstractCegarLoop]: Abstraction has 2147 states and 2237 transitions. [2018-12-03 18:16:57,026 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-03 18:16:57,026 INFO L276 IsEmpty]: Start isEmpty. Operand 2147 states and 2237 transitions. [2018-12-03 18:16:57,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2018-12-03 18:16:57,029 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:57,029 INFO L402 BasicCegarLoop]: trace histogram [121, 120, 2, 1, 1, 1] [2018-12-03 18:16:57,029 INFO L423 AbstractCegarLoop]: === Iteration 88 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:57,029 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:57,030 INFO L82 PathProgramCache]: Analyzing trace with hash 1083309560, now seen corresponding path program 85 times [2018-12-03 18:16:57,030 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:57,030 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:57,030 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:57,030 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:57,030 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:57,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:59,694 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 18:16:59,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:59,695 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:59,695 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:59,695 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:59,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:59,695 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:16:59,704 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:59,704 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:59,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:59,800 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:59,865 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 18:16:59,866 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:07,890 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 18:17:07,909 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:07,909 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86, 86] total 171 [2018-12-03 18:17:07,910 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:07,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-12-03 18:17:07,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-12-03 18:17:07,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14706, Invalid=14706, Unknown=0, NotChecked=0, Total=29412 [2018-12-03 18:17:07,913 INFO L87 Difference]: Start difference. First operand 2147 states and 2237 transitions. Second operand 87 states. [2018-12-03 18:17:08,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:08,177 INFO L93 Difference]: Finished difference Result 4126 states and 4306 transitions. [2018-12-03 18:17:08,177 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 18:17:08,177 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 246 [2018-12-03 18:17:08,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:08,179 INFO L225 Difference]: With dead ends: 4126 [2018-12-03 18:17:08,179 INFO L226 Difference]: Without dead ends: 2149 [2018-12-03 18:17:08,182 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 576 GetRequests, 406 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=14706, Invalid=14706, Unknown=0, NotChecked=0, Total=29412 [2018-12-03 18:17:08,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2149 states. [2018-12-03 18:17:08,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2149 to 2149. [2018-12-03 18:17:08,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2149 states. [2018-12-03 18:17:08,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2149 states to 2149 states and 2239 transitions. [2018-12-03 18:17:08,227 INFO L78 Accepts]: Start accepts. Automaton has 2149 states and 2239 transitions. Word has length 246 [2018-12-03 18:17:08,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:08,227 INFO L480 AbstractCegarLoop]: Abstraction has 2149 states and 2239 transitions. [2018-12-03 18:17:08,227 INFO L481 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-12-03 18:17:08,227 INFO L276 IsEmpty]: Start isEmpty. Operand 2149 states and 2239 transitions. [2018-12-03 18:17:08,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2018-12-03 18:17:08,229 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:08,230 INFO L402 BasicCegarLoop]: trace histogram [122, 121, 2, 1, 1, 1] [2018-12-03 18:17:08,230 INFO L423 AbstractCegarLoop]: === Iteration 89 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:08,230 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:08,230 INFO L82 PathProgramCache]: Analyzing trace with hash 709023858, now seen corresponding path program 86 times [2018-12-03 18:17:08,230 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:08,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:08,231 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:08,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:08,231 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:08,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:10,998 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 18:17:10,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:10,998 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:10,998 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:10,998 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:10,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:10,999 INFO 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 18:17:11,007 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:17:11,007 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:17:11,162 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:17:11,163 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:11,166 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:12,503 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 18:17:12,503 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:14,147 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 18:17:14,167 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:14,168 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 29, 29] total 142 [2018-12-03 18:17:14,168 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:14,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 115 states [2018-12-03 18:17:14,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2018-12-03 18:17:14,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5367, Invalid=14655, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 18:17:14,171 INFO L87 Difference]: Start difference. First operand 2149 states and 2239 transitions. Second operand 115 states. [2018-12-03 18:17:21,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:21,042 INFO L93 Difference]: Finished difference Result 4230 states and 4424 transitions. [2018-12-03 18:17:21,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 141 states. [2018-12-03 18:17:21,042 INFO L78 Accepts]: Start accepts. Automaton has 115 states. Word has length 248 [2018-12-03 18:17:21,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:21,045 INFO L225 Difference]: With dead ends: 4230 [2018-12-03 18:17:21,045 INFO L226 Difference]: Without dead ends: 2253 [2018-12-03 18:17:21,050 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 18:17:21,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2253 states. [2018-12-03 18:17:21,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2253 to 2227. [2018-12-03 18:17:21,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2227 states. [2018-12-03 18:17:21,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2227 states to 2227 states and 2319 transitions. [2018-12-03 18:17:21,093 INFO L78 Accepts]: Start accepts. Automaton has 2227 states and 2319 transitions. Word has length 248 [2018-12-03 18:17:21,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:21,094 INFO L480 AbstractCegarLoop]: Abstraction has 2227 states and 2319 transitions. [2018-12-03 18:17:21,094 INFO L481 AbstractCegarLoop]: Interpolant automaton has 115 states. [2018-12-03 18:17:21,094 INFO L276 IsEmpty]: Start isEmpty. Operand 2227 states and 2319 transitions. [2018-12-03 18:17:21,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2018-12-03 18:17:21,096 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:21,096 INFO L402 BasicCegarLoop]: trace histogram [123, 122, 2, 1, 1, 1] [2018-12-03 18:17:21,096 INFO L423 AbstractCegarLoop]: === Iteration 90 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:21,096 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:21,096 INFO L82 PathProgramCache]: Analyzing trace with hash 1444848876, now seen corresponding path program 87 times [2018-12-03 18:17:21,096 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:21,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:21,097 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:21,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:21,097 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:21,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:24,122 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 18:17:24,123 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:24,123 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:24,123 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:24,123 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:24,123 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:24,123 INFO 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 18:17:24,135 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:17:24,135 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:17:24,227 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:17:24,227 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:24,232 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:24,281 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 18:17:24,282 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:32,606 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 18:17:32,626 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:32,627 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 175 [2018-12-03 18:17:32,627 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:32,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 18:17:32,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 18:17:32,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15400, Invalid=15400, Unknown=0, NotChecked=0, Total=30800 [2018-12-03 18:17:32,629 INFO L87 Difference]: Start difference. First operand 2227 states and 2319 transitions. Second operand 89 states. [2018-12-03 18:17:32,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:32,972 INFO L93 Difference]: Finished difference Result 4282 states and 4466 transitions. [2018-12-03 18:17:32,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 18:17:32,972 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 250 [2018-12-03 18:17:32,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:32,974 INFO L225 Difference]: With dead ends: 4282 [2018-12-03 18:17:32,974 INFO L226 Difference]: Without dead ends: 2229 [2018-12-03 18:17:32,976 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 412 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=15400, Invalid=15400, Unknown=0, NotChecked=0, Total=30800 [2018-12-03 18:17:32,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2229 states. [2018-12-03 18:17:33,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2229 to 2229. [2018-12-03 18:17:33,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2229 states. [2018-12-03 18:17:33,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2229 states to 2229 states and 2321 transitions. [2018-12-03 18:17:33,018 INFO L78 Accepts]: Start accepts. Automaton has 2229 states and 2321 transitions. Word has length 250 [2018-12-03 18:17:33,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:33,018 INFO L480 AbstractCegarLoop]: Abstraction has 2229 states and 2321 transitions. [2018-12-03 18:17:33,018 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 18:17:33,018 INFO L276 IsEmpty]: Start isEmpty. Operand 2229 states and 2321 transitions. [2018-12-03 18:17:33,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2018-12-03 18:17:33,020 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:33,020 INFO L402 BasicCegarLoop]: trace histogram [124, 123, 2, 1, 1, 1] [2018-12-03 18:17:33,020 INFO L423 AbstractCegarLoop]: === Iteration 91 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:33,020 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:33,020 INFO L82 PathProgramCache]: Analyzing trace with hash -292965786, now seen corresponding path program 88 times [2018-12-03 18:17:33,020 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:33,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:33,021 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:33,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:33,021 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:33,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:35,781 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 18:17:35,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:35,781 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:35,781 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:35,781 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:35,782 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:35,782 INFO 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 18:17:35,790 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:35,790 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:17:35,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:35,888 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:35,939 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 18:17:35,940 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:44,421 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 18:17:44,440 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:44,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 177 [2018-12-03 18:17:44,441 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:44,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-12-03 18:17:44,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-12-03 18:17:44,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15753, Invalid=15753, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 18:17:44,443 INFO L87 Difference]: Start difference. First operand 2229 states and 2321 transitions. Second operand 90 states. [2018-12-03 18:17:44,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:44,674 INFO L93 Difference]: Finished difference Result 4284 states and 4468 transitions. [2018-12-03 18:17:44,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2018-12-03 18:17:44,675 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 252 [2018-12-03 18:17:44,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:44,677 INFO L225 Difference]: With dead ends: 4284 [2018-12-03 18:17:44,677 INFO L226 Difference]: Without dead ends: 2231 [2018-12-03 18:17:44,679 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 415 SyntacticMatches, 0 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=15753, Invalid=15753, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 18:17:44,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2231 states. [2018-12-03 18:17:44,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2231 to 2231. [2018-12-03 18:17:44,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2231 states. [2018-12-03 18:17:44,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2231 states to 2231 states and 2323 transitions. [2018-12-03 18:17:44,720 INFO L78 Accepts]: Start accepts. Automaton has 2231 states and 2323 transitions. Word has length 252 [2018-12-03 18:17:44,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:44,721 INFO L480 AbstractCegarLoop]: Abstraction has 2231 states and 2323 transitions. [2018-12-03 18:17:44,721 INFO L481 AbstractCegarLoop]: Interpolant automaton has 90 states. [2018-12-03 18:17:44,721 INFO L276 IsEmpty]: Start isEmpty. Operand 2231 states and 2323 transitions. [2018-12-03 18:17:44,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-12-03 18:17:44,722 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:44,723 INFO L402 BasicCegarLoop]: trace histogram [125, 124, 2, 1, 1, 1] [2018-12-03 18:17:44,723 INFO L423 AbstractCegarLoop]: === Iteration 92 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:44,723 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:44,723 INFO L82 PathProgramCache]: Analyzing trace with hash 409422176, now seen corresponding path program 89 times [2018-12-03 18:17:44,723 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:44,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:44,724 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:44,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:44,724 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:44,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:47,833 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 18:17:47,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:47,833 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:47,833 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:47,833 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:47,834 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:47,834 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:17:47,842 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:17:47,843 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:17:47,966 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:17:47,966 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:47,969 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:49,329 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 18:17:49,330 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:51,038 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 18:17:51,057 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:51,057 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 30, 30] total 147 [2018-12-03 18:17:51,057 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:51,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2018-12-03 18:17:51,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2018-12-03 18:17:51,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5747, Invalid=15715, Unknown=0, NotChecked=0, Total=21462 [2018-12-03 18:17:51,060 INFO L87 Difference]: Start difference. First operand 2231 states and 2323 transitions. Second operand 119 states. [2018-12-03 18:17:58,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:58,635 INFO L93 Difference]: Finished difference Result 4389 states and 4586 transitions. [2018-12-03 18:17:58,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2018-12-03 18:17:58,636 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 254 [2018-12-03 18:17:58,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:58,638 INFO L225 Difference]: With dead ends: 4389 [2018-12-03 18:17:58,638 INFO L226 Difference]: Without dead ends: 2336 [2018-12-03 18:17:58,641 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 451 SyntacticMatches, 0 SemanticMatches, 261 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13318 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=21125, Invalid=47781, Unknown=0, NotChecked=0, Total=68906 [2018-12-03 18:17:58,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2336 states. [2018-12-03 18:17:58,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2336 to 2309. [2018-12-03 18:17:58,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2309 states. [2018-12-03 18:17:58,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2309 states to 2309 states and 2403 transitions. [2018-12-03 18:17:58,683 INFO L78 Accepts]: Start accepts. Automaton has 2309 states and 2403 transitions. Word has length 254 [2018-12-03 18:17:58,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:58,684 INFO L480 AbstractCegarLoop]: Abstraction has 2309 states and 2403 transitions. [2018-12-03 18:17:58,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has 119 states. [2018-12-03 18:17:58,684 INFO L276 IsEmpty]: Start isEmpty. Operand 2309 states and 2403 transitions. [2018-12-03 18:17:58,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2018-12-03 18:17:58,685 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:58,685 INFO L402 BasicCegarLoop]: trace histogram [126, 125, 2, 1, 1, 1] [2018-12-03 18:17:58,686 INFO L423 AbstractCegarLoop]: === Iteration 93 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:58,686 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:58,686 INFO L82 PathProgramCache]: Analyzing trace with hash 2130891354, now seen corresponding path program 90 times [2018-12-03 18:17:58,686 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:58,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:58,687 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:58,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:58,687 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:58,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:01,639 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 18:18:01,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:01,640 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:01,640 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:01,640 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:01,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:01,640 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:18:01,650 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:18:01,650 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:18:01,745 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:18:01,745 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:18:01,750 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:01,802 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 18:18:01,803 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:10,666 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 18:18:10,685 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:10,685 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 181 [2018-12-03 18:18:10,685 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:10,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-03 18:18:10,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-03 18:18:10,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16471, Invalid=16471, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 18:18:10,687 INFO L87 Difference]: Start difference. First operand 2309 states and 2403 transitions. Second operand 92 states. [2018-12-03 18:18:11,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:11,029 INFO L93 Difference]: Finished difference Result 4440 states and 4628 transitions. [2018-12-03 18:18:11,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2018-12-03 18:18:11,029 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 256 [2018-12-03 18:18:11,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:11,031 INFO L225 Difference]: With dead ends: 4440 [2018-12-03 18:18:11,031 INFO L226 Difference]: Without dead ends: 2311 [2018-12-03 18:18:11,033 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 421 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=16471, Invalid=16471, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 18:18:11,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2311 states. [2018-12-03 18:18:11,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2311 to 2311. [2018-12-03 18:18:11,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2311 states. [2018-12-03 18:18:11,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2311 states to 2311 states and 2405 transitions. [2018-12-03 18:18:11,076 INFO L78 Accepts]: Start accepts. Automaton has 2311 states and 2405 transitions. Word has length 256 [2018-12-03 18:18:11,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:11,076 INFO L480 AbstractCegarLoop]: Abstraction has 2311 states and 2405 transitions. [2018-12-03 18:18:11,076 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-03 18:18:11,076 INFO L276 IsEmpty]: Start isEmpty. Operand 2311 states and 2405 transitions. [2018-12-03 18:18:11,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-12-03 18:18:11,077 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:11,077 INFO L402 BasicCegarLoop]: trace histogram [127, 126, 2, 1, 1, 1] [2018-12-03 18:18:11,078 INFO L423 AbstractCegarLoop]: === Iteration 94 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:11,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:11,078 INFO L82 PathProgramCache]: Analyzing trace with hash -1041736620, now seen corresponding path program 91 times [2018-12-03 18:18:11,078 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:11,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:11,079 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:18:11,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:11,079 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:11,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:14,418 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 18:18:14,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:14,419 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:14,419 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:14,419 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:14,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:14,419 INFO 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 18:18:14,428 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:18:14,428 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:18:14,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:14,528 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:14,583 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 18:18:14,583 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:23,619 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 18:18:23,638 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:23,638 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 183 [2018-12-03 18:18:23,638 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:23,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-12-03 18:18:23,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-12-03 18:18:23,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16836, Invalid=16836, Unknown=0, NotChecked=0, Total=33672 [2018-12-03 18:18:23,641 INFO L87 Difference]: Start difference. First operand 2311 states and 2405 transitions. Second operand 93 states. [2018-12-03 18:18:23,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:23,865 INFO L93 Difference]: Finished difference Result 4442 states and 4630 transitions. [2018-12-03 18:18:23,865 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 18:18:23,865 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 258 [2018-12-03 18:18:23,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:23,867 INFO L225 Difference]: With dead ends: 4442 [2018-12-03 18:18:23,867 INFO L226 Difference]: Without dead ends: 2313 [2018-12-03 18:18:23,869 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 424 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=16836, Invalid=16836, Unknown=0, NotChecked=0, Total=33672 [2018-12-03 18:18:23,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2313 states. [2018-12-03 18:18:23,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2313 to 2313. [2018-12-03 18:18:23,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2313 states. [2018-12-03 18:18:23,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2313 states to 2313 states and 2407 transitions. [2018-12-03 18:18:23,906 INFO L78 Accepts]: Start accepts. Automaton has 2313 states and 2407 transitions. Word has length 258 [2018-12-03 18:18:23,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:23,906 INFO L480 AbstractCegarLoop]: Abstraction has 2313 states and 2407 transitions. [2018-12-03 18:18:23,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-12-03 18:18:23,907 INFO L276 IsEmpty]: Start isEmpty. Operand 2313 states and 2407 transitions. [2018-12-03 18:18:23,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2018-12-03 18:18:23,908 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:23,908 INFO L402 BasicCegarLoop]: trace histogram [128, 127, 2, 1, 1, 1] [2018-12-03 18:18:23,908 INFO L423 AbstractCegarLoop]: === Iteration 95 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:23,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:23,908 INFO L82 PathProgramCache]: Analyzing trace with hash -510439474, now seen corresponding path program 92 times [2018-12-03 18:18:23,909 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:23,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:23,909 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:18:23,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:23,909 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:23,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:26,991 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 18:18:26,991 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:26,991 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:26,991 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:26,991 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:26,991 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:26,992 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:18:26,999 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:18:27,000 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:18:27,252 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:18:27,253 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:18:27,256 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:28,872 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 18:18:28,872 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:30,822 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 18:18:30,842 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:30,842 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 31, 31] total 152 [2018-12-03 18:18:30,842 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:30,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 123 states [2018-12-03 18:18:30,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2018-12-03 18:18:30,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6140, Invalid=16812, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 18:18:30,845 INFO L87 Difference]: Start difference. First operand 2313 states and 2407 transitions. Second operand 123 states. [2018-12-03 18:18:38,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:38,581 INFO L93 Difference]: Finished difference Result 4548 states and 4748 transitions. [2018-12-03 18:18:38,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2018-12-03 18:18:38,581 INFO L78 Accepts]: Start accepts. Automaton has 123 states. Word has length 260 [2018-12-03 18:18:38,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:38,583 INFO L225 Difference]: With dead ends: 4548 [2018-12-03 18:18:38,583 INFO L226 Difference]: Without dead ends: 2419 [2018-12-03 18:18:38,588 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 731 GetRequests, 461 SyntacticMatches, 0 SemanticMatches, 270 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14258 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=22588, Invalid=51124, Unknown=0, NotChecked=0, Total=73712 [2018-12-03 18:18:38,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2419 states. [2018-12-03 18:18:38,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2419 to 2391. [2018-12-03 18:18:38,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2391 states. [2018-12-03 18:18:38,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2391 states to 2391 states and 2487 transitions. [2018-12-03 18:18:38,632 INFO L78 Accepts]: Start accepts. Automaton has 2391 states and 2487 transitions. Word has length 260 [2018-12-03 18:18:38,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:38,632 INFO L480 AbstractCegarLoop]: Abstraction has 2391 states and 2487 transitions. [2018-12-03 18:18:38,632 INFO L481 AbstractCegarLoop]: Interpolant automaton has 123 states. [2018-12-03 18:18:38,633 INFO L276 IsEmpty]: Start isEmpty. Operand 2391 states and 2487 transitions. [2018-12-03 18:18:38,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2018-12-03 18:18:38,634 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:38,634 INFO L402 BasicCegarLoop]: trace histogram [129, 128, 2, 1, 1, 1] [2018-12-03 18:18:38,634 INFO L423 AbstractCegarLoop]: === Iteration 96 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:38,635 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:38,635 INFO L82 PathProgramCache]: Analyzing trace with hash 141505864, now seen corresponding path program 93 times [2018-12-03 18:18:38,635 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:38,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:38,635 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:18:38,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:38,636 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:38,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:41,754 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 18:18:41,754 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:41,754 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:41,755 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:41,755 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:41,755 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:41,755 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 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 18:18:41,764 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:18:41,765 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:18:41,860 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:18:41,861 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:18:41,866 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:41,920 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 18:18:41,921 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:51,389 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 18:18:51,408 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:51,408 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94, 94] total 187 [2018-12-03 18:18:51,408 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:51,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 18:18:51,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 18:18:51,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17578, Invalid=17578, Unknown=0, NotChecked=0, Total=35156 [2018-12-03 18:18:51,410 INFO L87 Difference]: Start difference. First operand 2391 states and 2487 transitions. Second operand 95 states. [2018-12-03 18:18:51,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:51,670 INFO L93 Difference]: Finished difference Result 4598 states and 4790 transitions. [2018-12-03 18:18:51,670 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 18:18:51,670 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 262 [2018-12-03 18:18:51,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:51,672 INFO L225 Difference]: With dead ends: 4598 [2018-12-03 18:18:51,672 INFO L226 Difference]: Without dead ends: 2393 [2018-12-03 18:18:51,675 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 616 GetRequests, 430 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=17578, Invalid=17578, Unknown=0, NotChecked=0, Total=35156 [2018-12-03 18:18:51,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2393 states. [2018-12-03 18:18:51,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2393 to 2393. [2018-12-03 18:18:51,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2393 states. [2018-12-03 18:18:51,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2393 states to 2393 states and 2489 transitions. [2018-12-03 18:18:51,716 INFO L78 Accepts]: Start accepts. Automaton has 2393 states and 2489 transitions. Word has length 262 [2018-12-03 18:18:51,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:51,717 INFO L480 AbstractCegarLoop]: Abstraction has 2393 states and 2489 transitions. [2018-12-03 18:18:51,717 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 18:18:51,717 INFO L276 IsEmpty]: Start isEmpty. Operand 2393 states and 2489 transitions. [2018-12-03 18:18:51,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-12-03 18:18:51,718 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:51,718 INFO L402 BasicCegarLoop]: trace histogram [130, 129, 2, 1, 1, 1] [2018-12-03 18:18:51,718 INFO L423 AbstractCegarLoop]: === Iteration 97 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:51,719 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:51,719 INFO L82 PathProgramCache]: Analyzing trace with hash -1440752702, now seen corresponding path program 94 times [2018-12-03 18:18:51,719 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:51,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:51,720 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:18:51,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:51,720 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:51,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:55,222 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 18:18:55,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:55,223 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:55,223 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:55,223 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:55,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:55,223 INFO 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 18:18:55,231 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:18:55,231 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:18:55,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:55,338 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:55,393 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 18:18:55,393 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:05,149 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 18:19:05,169 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:05,169 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 189 [2018-12-03 18:19:05,169 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:05,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2018-12-03 18:19:05,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2018-12-03 18:19:05,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17955, Invalid=17955, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 18:19:05,172 INFO L87 Difference]: Start difference. First operand 2393 states and 2489 transitions. Second operand 96 states. [2018-12-03 18:19:05,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:05,502 INFO L93 Difference]: Finished difference Result 4600 states and 4792 transitions. [2018-12-03 18:19:05,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2018-12-03 18:19:05,502 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 264 [2018-12-03 18:19:05,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:05,504 INFO L225 Difference]: With dead ends: 4600 [2018-12-03 18:19:05,504 INFO L226 Difference]: Without dead ends: 2395 [2018-12-03 18:19:05,507 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 433 SyntacticMatches, 0 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=17955, Invalid=17955, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 18:19:05,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2395 states. [2018-12-03 18:19:05,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2395 to 2395. [2018-12-03 18:19:05,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2395 states. [2018-12-03 18:19:05,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2395 states to 2395 states and 2491 transitions. [2018-12-03 18:19:05,551 INFO L78 Accepts]: Start accepts. Automaton has 2395 states and 2491 transitions. Word has length 264 [2018-12-03 18:19:05,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:05,551 INFO L480 AbstractCegarLoop]: Abstraction has 2395 states and 2491 transitions. [2018-12-03 18:19:05,551 INFO L481 AbstractCegarLoop]: Interpolant automaton has 96 states. [2018-12-03 18:19:05,551 INFO L276 IsEmpty]: Start isEmpty. Operand 2395 states and 2491 transitions. [2018-12-03 18:19:05,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2018-12-03 18:19:05,553 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:05,553 INFO L402 BasicCegarLoop]: trace histogram [131, 130, 2, 1, 1, 1] [2018-12-03 18:19:05,553 INFO L423 AbstractCegarLoop]: === Iteration 98 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:05,553 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:05,553 INFO L82 PathProgramCache]: Analyzing trace with hash -1572811844, now seen corresponding path program 95 times [2018-12-03 18:19:05,553 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:05,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:05,554 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:19:05,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:05,554 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:05,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:09,121 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 18:19:09,121 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:09,121 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:09,121 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:09,121 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:09,121 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:09,122 INFO 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 18:19:09,130 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:19:09,130 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:19:09,250 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:19:09,251 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:19:09,254 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:10,622 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 18:19:10,622 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:12,669 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 18:19:12,688 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:12,688 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 32, 32] total 157 [2018-12-03 18:19:12,688 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:12,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 127 states [2018-12-03 18:19:12,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2018-12-03 18:19:12,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6546, Invalid=17946, Unknown=0, NotChecked=0, Total=24492 [2018-12-03 18:19:12,690 INFO L87 Difference]: Start difference. First operand 2395 states and 2491 transitions. Second operand 127 states. [2018-12-03 18:19:21,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:21,193 INFO L93 Difference]: Finished difference Result 4707 states and 4910 transitions. [2018-12-03 18:19:21,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 156 states. [2018-12-03 18:19:21,194 INFO L78 Accepts]: Start accepts. Automaton has 127 states. Word has length 266 [2018-12-03 18:19:21,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:21,196 INFO L225 Difference]: With dead ends: 4707 [2018-12-03 18:19:21,196 INFO L226 Difference]: Without dead ends: 2502 [2018-12-03 18:19:21,199 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 750 GetRequests, 471 SyntacticMatches, 0 SemanticMatches, 279 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15230 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=24100, Invalid=54580, Unknown=0, NotChecked=0, Total=78680 [2018-12-03 18:19:21,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2502 states. [2018-12-03 18:19:21,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2502 to 2473. [2018-12-03 18:19:21,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2473 states. [2018-12-03 18:19:21,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2473 states to 2473 states and 2571 transitions. [2018-12-03 18:19:21,263 INFO L78 Accepts]: Start accepts. Automaton has 2473 states and 2571 transitions. Word has length 266 [2018-12-03 18:19:21,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:21,263 INFO L480 AbstractCegarLoop]: Abstraction has 2473 states and 2571 transitions. [2018-12-03 18:19:21,263 INFO L481 AbstractCegarLoop]: Interpolant automaton has 127 states. [2018-12-03 18:19:21,263 INFO L276 IsEmpty]: Start isEmpty. Operand 2473 states and 2571 transitions. [2018-12-03 18:19:21,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2018-12-03 18:19:21,265 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:21,265 INFO L402 BasicCegarLoop]: trace histogram [132, 131, 2, 1, 1, 1] [2018-12-03 18:19:21,265 INFO L423 AbstractCegarLoop]: === Iteration 99 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:21,265 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:21,266 INFO L82 PathProgramCache]: Analyzing trace with hash -605704778, now seen corresponding path program 96 times [2018-12-03 18:19:21,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:21,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:21,266 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:19:21,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:21,266 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:21,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:24,899 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 18:19:24,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:24,900 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:24,900 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:24,900 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:24,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:24,900 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:19:24,910 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:19:24,910 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:19:25,006 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:19:25,006 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:19:25,011 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:25,068 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 18:19:25,068 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:35,074 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 18:19:35,093 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:35,093 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 193 [2018-12-03 18:19:35,093 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:35,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2018-12-03 18:19:35,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2018-12-03 18:19:35,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18721, Invalid=18721, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 18:19:35,096 INFO L87 Difference]: Start difference. First operand 2473 states and 2571 transitions. Second operand 98 states. [2018-12-03 18:19:35,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:35,385 INFO L93 Difference]: Finished difference Result 4756 states and 4952 transitions. [2018-12-03 18:19:35,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2018-12-03 18:19:35,385 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 268 [2018-12-03 18:19:35,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:35,387 INFO L225 Difference]: With dead ends: 4756 [2018-12-03 18:19:35,388 INFO L226 Difference]: Without dead ends: 2475 [2018-12-03 18:19:35,390 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 631 GetRequests, 439 SyntacticMatches, 0 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=18721, Invalid=18721, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 18:19:35,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2475 states. [2018-12-03 18:19:35,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2475 to 2475. [2018-12-03 18:19:35,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2475 states. [2018-12-03 18:19:35,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2475 states to 2475 states and 2573 transitions. [2018-12-03 18:19:35,435 INFO L78 Accepts]: Start accepts. Automaton has 2475 states and 2573 transitions. Word has length 268 [2018-12-03 18:19:35,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:35,435 INFO L480 AbstractCegarLoop]: Abstraction has 2475 states and 2573 transitions. [2018-12-03 18:19:35,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has 98 states. [2018-12-03 18:19:35,435 INFO L276 IsEmpty]: Start isEmpty. Operand 2475 states and 2573 transitions. [2018-12-03 18:19:35,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2018-12-03 18:19:35,437 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:35,437 INFO L402 BasicCegarLoop]: trace histogram [133, 132, 2, 1, 1, 1] [2018-12-03 18:19:35,437 INFO L423 AbstractCegarLoop]: === Iteration 100 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:35,437 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:35,438 INFO L82 PathProgramCache]: Analyzing trace with hash -105246544, now seen corresponding path program 97 times [2018-12-03 18:19:35,438 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:35,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:35,438 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:19:35,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:35,439 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:35,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:38,823 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 18:19:38,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:38,824 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:38,824 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:38,824 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:38,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:38,824 INFO 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 18:19:38,832 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:19:38,833 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:19:38,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:38,936 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:38,994 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 18:19:38,994 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:49,321 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 18:19:49,339 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:49,340 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 195 [2018-12-03 18:19:49,340 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:49,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-12-03 18:19:49,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-12-03 18:19:49,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19110, Invalid=19110, Unknown=0, NotChecked=0, Total=38220 [2018-12-03 18:19:49,343 INFO L87 Difference]: Start difference. First operand 2475 states and 2573 transitions. Second operand 99 states. [2018-12-03 18:19:49,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:49,685 INFO L93 Difference]: Finished difference Result 4758 states and 4954 transitions. [2018-12-03 18:19:49,685 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 18:19:49,685 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 270 [2018-12-03 18:19:49,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:49,687 INFO L225 Difference]: With dead ends: 4758 [2018-12-03 18:19:49,687 INFO L226 Difference]: Without dead ends: 2477 [2018-12-03 18:19:49,689 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 636 GetRequests, 442 SyntacticMatches, 0 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=19110, Invalid=19110, Unknown=0, NotChecked=0, Total=38220 [2018-12-03 18:19:49,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2477 states. [2018-12-03 18:19:49,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2477 to 2477. [2018-12-03 18:19:49,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2477 states. [2018-12-03 18:19:49,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2477 states to 2477 states and 2575 transitions. [2018-12-03 18:19:49,736 INFO L78 Accepts]: Start accepts. Automaton has 2477 states and 2575 transitions. Word has length 270 [2018-12-03 18:19:49,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:49,736 INFO L480 AbstractCegarLoop]: Abstraction has 2477 states and 2575 transitions. [2018-12-03 18:19:49,736 INFO L481 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-12-03 18:19:49,736 INFO L276 IsEmpty]: Start isEmpty. Operand 2477 states and 2575 transitions. [2018-12-03 18:19:49,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2018-12-03 18:19:49,738 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:49,738 INFO L402 BasicCegarLoop]: trace histogram [134, 133, 2, 1, 1, 1] [2018-12-03 18:19:49,738 INFO L423 AbstractCegarLoop]: === Iteration 101 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:49,738 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:49,739 INFO L82 PathProgramCache]: Analyzing trace with hash -201220822, now seen corresponding path program 98 times [2018-12-03 18:19:49,739 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:49,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:49,739 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:19:49,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:49,740 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:49,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:53,376 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 18:19:53,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:53,376 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:53,377 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:53,377 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:53,377 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:53,377 INFO 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 18:19:53,386 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:19:53,386 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:19:53,508 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:19:53,508 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:19:53,511 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:55,287 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 18:19:55,288 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:57,389 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 18:19:57,408 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:57,408 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 33, 33] total 162 [2018-12-03 18:19:57,408 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:57,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2018-12-03 18:19:57,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2018-12-03 18:19:57,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6965, Invalid=19117, Unknown=0, NotChecked=0, Total=26082 [2018-12-03 18:19:57,411 INFO L87 Difference]: Start difference. First operand 2477 states and 2575 transitions. Second operand 131 states. [2018-12-03 18:20:06,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:20:06,057 INFO L93 Difference]: Finished difference Result 4866 states and 5072 transitions. [2018-12-03 18:20:06,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2018-12-03 18:20:06,057 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 272 [2018-12-03 18:20:06,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:20:06,059 INFO L225 Difference]: With dead ends: 4866 [2018-12-03 18:20:06,059 INFO L226 Difference]: Without dead ends: 2585 [2018-12-03 18:20:06,061 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 481 SyntacticMatches, 0 SemanticMatches, 288 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16234 ImplicationChecksByTransitivity, 15.2s TimeCoverageRelationStatistics Valid=25661, Invalid=58149, Unknown=0, NotChecked=0, Total=83810 [2018-12-03 18:20:06,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2585 states. [2018-12-03 18:20:06,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2585 to 2555. [2018-12-03 18:20:06,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2555 states. [2018-12-03 18:20:06,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2555 states to 2555 states and 2655 transitions. [2018-12-03 18:20:06,121 INFO L78 Accepts]: Start accepts. Automaton has 2555 states and 2655 transitions. Word has length 272 [2018-12-03 18:20:06,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:20:06,121 INFO L480 AbstractCegarLoop]: Abstraction has 2555 states and 2655 transitions. [2018-12-03 18:20:06,121 INFO L481 AbstractCegarLoop]: Interpolant automaton has 131 states. [2018-12-03 18:20:06,121 INFO L276 IsEmpty]: Start isEmpty. Operand 2555 states and 2655 transitions. [2018-12-03 18:20:06,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2018-12-03 18:20:06,124 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:20:06,124 INFO L402 BasicCegarLoop]: trace histogram [135, 134, 2, 1, 1, 1] [2018-12-03 18:20:06,124 INFO L423 AbstractCegarLoop]: === Iteration 102 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:20:06,124 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:20:06,124 INFO L82 PathProgramCache]: Analyzing trace with hash 2046827428, now seen corresponding path program 99 times [2018-12-03 18:20:06,125 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:20:06,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:06,125 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:20:06,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:06,125 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:20:06,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:09,671 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 18:20:09,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:09,672 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:20:09,672 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:20:09,672 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:20:09,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:09,672 INFO 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 18:20:09,680 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:20:09,680 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:20:09,781 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:20:09,781 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:20:09,786 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:20:09,845 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 18:20:09,845 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:20:20,558 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 18:20:20,576 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:20:20,577 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100, 100] total 199 [2018-12-03 18:20:20,577 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:20:20,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 18:20:20,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 18:20:20,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19900, Invalid=19900, Unknown=0, NotChecked=0, Total=39800 [2018-12-03 18:20:20,580 INFO L87 Difference]: Start difference. First operand 2555 states and 2655 transitions. Second operand 101 states. [2018-12-03 18:20:21,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:20:21,092 INFO L93 Difference]: Finished difference Result 4914 states and 5114 transitions. [2018-12-03 18:20:21,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2018-12-03 18:20:21,093 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 274 [2018-12-03 18:20:21,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:20:21,094 INFO L225 Difference]: With dead ends: 4914 [2018-12-03 18:20:21,094 INFO L226 Difference]: Without dead ends: 2557 [2018-12-03 18:20:21,098 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 646 GetRequests, 448 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=19900, Invalid=19900, Unknown=0, NotChecked=0, Total=39800 [2018-12-03 18:20:21,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2557 states. [2018-12-03 18:20:21,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2557 to 2557. [2018-12-03 18:20:21,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2557 states. [2018-12-03 18:20:21,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2557 states to 2557 states and 2657 transitions. [2018-12-03 18:20:21,138 INFO L78 Accepts]: Start accepts. Automaton has 2557 states and 2657 transitions. Word has length 274 [2018-12-03 18:20:21,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:20:21,138 INFO L480 AbstractCegarLoop]: Abstraction has 2557 states and 2657 transitions. [2018-12-03 18:20:21,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has 101 states. [2018-12-03 18:20:21,138 INFO L276 IsEmpty]: Start isEmpty. Operand 2557 states and 2657 transitions. [2018-12-03 18:20:21,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2018-12-03 18:20:21,140 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:20:21,140 INFO L402 BasicCegarLoop]: trace histogram [136, 135, 2, 1, 1, 1] [2018-12-03 18:20:21,140 INFO L423 AbstractCegarLoop]: === Iteration 103 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:20:21,141 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:20:21,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1269245154, now seen corresponding path program 100 times [2018-12-03 18:20:21,141 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:20:21,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:21,141 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:20:21,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:21,142 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:20:21,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:24,684 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 18:20:24,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:24,685 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:20:24,685 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:20:24,685 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:20:24,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:24,685 INFO 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 18:20:24,694 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:20:24,694 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:20:24,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:24,798 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:20:24,857 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 18:20:24,858 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:20:35,708 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 18:20:35,727 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:20:35,727 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 201 [2018-12-03 18:20:35,727 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:20:35,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2018-12-03 18:20:35,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2018-12-03 18:20:35,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20301, Invalid=20301, Unknown=0, NotChecked=0, Total=40602 [2018-12-03 18:20:35,730 INFO L87 Difference]: Start difference. First operand 2557 states and 2657 transitions. Second operand 102 states. [2018-12-03 18:20:36,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:20:36,161 INFO L93 Difference]: Finished difference Result 4916 states and 5116 transitions. [2018-12-03 18:20:36,161 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2018-12-03 18:20:36,161 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 276 [2018-12-03 18:20:36,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:20:36,163 INFO L225 Difference]: With dead ends: 4916 [2018-12-03 18:20:36,163 INFO L226 Difference]: Without dead ends: 2559 [2018-12-03 18:20:36,166 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 651 GetRequests, 451 SyntacticMatches, 0 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=20301, Invalid=20301, Unknown=0, NotChecked=0, Total=40602 [2018-12-03 18:20:36,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2559 states. [2018-12-03 18:20:36,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2559 to 2559. [2018-12-03 18:20:36,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2559 states. [2018-12-03 18:20:36,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2559 states to 2559 states and 2659 transitions. [2018-12-03 18:20:36,217 INFO L78 Accepts]: Start accepts. Automaton has 2559 states and 2659 transitions. Word has length 276 [2018-12-03 18:20:36,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:20:36,217 INFO L480 AbstractCegarLoop]: Abstraction has 2559 states and 2659 transitions. [2018-12-03 18:20:36,217 INFO L481 AbstractCegarLoop]: Interpolant automaton has 102 states. [2018-12-03 18:20:36,218 INFO L276 IsEmpty]: Start isEmpty. Operand 2559 states and 2659 transitions. [2018-12-03 18:20:36,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2018-12-03 18:20:36,219 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:20:36,219 INFO L402 BasicCegarLoop]: trace histogram [137, 136, 2, 1, 1, 1] [2018-12-03 18:20:36,219 INFO L423 AbstractCegarLoop]: === Iteration 104 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:20:36,219 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:20:36,219 INFO L82 PathProgramCache]: Analyzing trace with hash -1149262824, now seen corresponding path program 101 times [2018-12-03 18:20:36,220 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:20:36,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:36,220 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:20:36,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:36,220 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:20:36,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:39,933 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 18:20:39,934 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:39,934 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:20:39,934 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:20:39,934 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:20:39,934 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:39,934 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:20:39,943 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:20:39,943 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:20:40,069 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:20:40,069 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:20:40,072 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:20:41,942 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 18:20:41,943 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:20:44,222 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 18:20:44,240 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:20:44,240 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 34, 34] total 167 [2018-12-03 18:20:44,240 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:20:44,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 135 states [2018-12-03 18:20:44,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2018-12-03 18:20:44,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7397, Invalid=20325, Unknown=0, NotChecked=0, Total=27722 [2018-12-03 18:20:44,243 INFO L87 Difference]: Start difference. First operand 2559 states and 2659 transitions. Second operand 135 states. [2018-12-03 18:20:55,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:20:55,561 INFO L93 Difference]: Finished difference Result 5025 states and 5234 transitions. [2018-12-03 18:20:55,561 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 197 states. [2018-12-03 18:20:55,561 INFO L78 Accepts]: Start accepts. Automaton has 135 states. Word has length 278 [2018-12-03 18:20:55,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:20:55,563 INFO L225 Difference]: With dead ends: 5025 [2018-12-03 18:20:55,563 INFO L226 Difference]: Without dead ends: 2668 [2018-12-03 18:20:55,567 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 820 GetRequests, 492 SyntacticMatches, 0 SemanticMatches, 328 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21606 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=30371, Invalid=78199, Unknown=0, NotChecked=0, Total=108570 [2018-12-03 18:20:55,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2668 states. [2018-12-03 18:20:55,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2668 to 2637. [2018-12-03 18:20:55,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2637 states. [2018-12-03 18:20:55,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2637 states to 2637 states and 2739 transitions. [2018-12-03 18:20:55,668 INFO L78 Accepts]: Start accepts. Automaton has 2637 states and 2739 transitions. Word has length 278 [2018-12-03 18:20:55,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:20:55,668 INFO L480 AbstractCegarLoop]: Abstraction has 2637 states and 2739 transitions. [2018-12-03 18:20:55,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has 135 states. [2018-12-03 18:20:55,668 INFO L276 IsEmpty]: Start isEmpty. Operand 2637 states and 2739 transitions. [2018-12-03 18:20:55,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 281 [2018-12-03 18:20:55,671 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:20:55,671 INFO L402 BasicCegarLoop]: trace histogram [138, 137, 2, 1, 1, 1] [2018-12-03 18:20:55,671 INFO L423 AbstractCegarLoop]: === Iteration 105 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:20:55,671 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:20:55,671 INFO L82 PathProgramCache]: Analyzing trace with hash 1215323922, now seen corresponding path program 102 times [2018-12-03 18:20:55,671 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:20:55,672 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:55,672 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:20:55,672 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:55,672 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:20:55,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:59,686 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 18:20:59,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:59,686 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:20:59,686 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:20:59,686 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:20:59,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:59,687 INFO 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 18:20:59,694 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:20:59,695 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:20:59,797 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:20:59,797 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:20:59,802 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:20:59,863 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 18:20:59,863 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:21:11,030 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 18:21:11,049 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:21:11,049 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 103, 103] total 205 [2018-12-03 18:21:11,049 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:21:11,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2018-12-03 18:21:11,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2018-12-03 18:21:11,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21115, Invalid=21115, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 18:21:11,052 INFO L87 Difference]: Start difference. First operand 2637 states and 2739 transitions. Second operand 104 states. [2018-12-03 18:21:11,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:21:11,395 INFO L93 Difference]: Finished difference Result 5072 states and 5276 transitions. [2018-12-03 18:21:11,395 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2018-12-03 18:21:11,395 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 280 [2018-12-03 18:21:11,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:21:11,397 INFO L225 Difference]: With dead ends: 5072 [2018-12-03 18:21:11,397 INFO L226 Difference]: Without dead ends: 2639 [2018-12-03 18:21:11,400 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 661 GetRequests, 457 SyntacticMatches, 0 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=21115, Invalid=21115, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 18:21:11,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2639 states. [2018-12-03 18:21:11,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2639 to 2639. [2018-12-03 18:21:11,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2639 states. [2018-12-03 18:21:11,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2639 states to 2639 states and 2741 transitions. [2018-12-03 18:21:11,447 INFO L78 Accepts]: Start accepts. Automaton has 2639 states and 2741 transitions. Word has length 280 [2018-12-03 18:21:11,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:21:11,448 INFO L480 AbstractCegarLoop]: Abstraction has 2639 states and 2741 transitions. [2018-12-03 18:21:11,448 INFO L481 AbstractCegarLoop]: Interpolant automaton has 104 states. [2018-12-03 18:21:11,448 INFO L276 IsEmpty]: Start isEmpty. Operand 2639 states and 2741 transitions. [2018-12-03 18:21:11,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2018-12-03 18:21:11,449 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:21:11,450 INFO L402 BasicCegarLoop]: trace histogram [139, 138, 2, 1, 1, 1] [2018-12-03 18:21:11,450 INFO L423 AbstractCegarLoop]: === Iteration 106 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:21:11,450 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:21:11,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1555438348, now seen corresponding path program 103 times [2018-12-03 18:21:11,450 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:21:11,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:11,451 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:21:11,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:11,451 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:21:11,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:15,571 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 18:21:15,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:15,572 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:21:15,572 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:21:15,572 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:21:15,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:15,572 INFO 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 18:21:15,580 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:21:15,580 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:21:15,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:15,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:21:15,742 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 18:21:15,742 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:21:27,520 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 18:21:27,538 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:21:27,539 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104, 104] total 207 [2018-12-03 18:21:27,539 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:21:27,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 105 states [2018-12-03 18:21:27,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2018-12-03 18:21:27,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21528, Invalid=21528, Unknown=0, NotChecked=0, Total=43056 [2018-12-03 18:21:27,541 INFO L87 Difference]: Start difference. First operand 2639 states and 2741 transitions. Second operand 105 states. [2018-12-03 18:21:27,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:21:27,854 INFO L93 Difference]: Finished difference Result 5074 states and 5278 transitions. [2018-12-03 18:21:27,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2018-12-03 18:21:27,855 INFO L78 Accepts]: Start accepts. Automaton has 105 states. Word has length 282 [2018-12-03 18:21:27,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:21:27,857 INFO L225 Difference]: With dead ends: 5074 [2018-12-03 18:21:27,857 INFO L226 Difference]: Without dead ends: 2641 [2018-12-03 18:21:27,859 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 666 GetRequests, 460 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=21528, Invalid=21528, Unknown=0, NotChecked=0, Total=43056 [2018-12-03 18:21:27,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2641 states. [2018-12-03 18:21:27,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2641 to 2641. [2018-12-03 18:21:27,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2641 states. [2018-12-03 18:21:27,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2641 states to 2641 states and 2743 transitions. [2018-12-03 18:21:27,911 INFO L78 Accepts]: Start accepts. Automaton has 2641 states and 2743 transitions. Word has length 282 [2018-12-03 18:21:27,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:21:27,911 INFO L480 AbstractCegarLoop]: Abstraction has 2641 states and 2743 transitions. [2018-12-03 18:21:27,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has 105 states. [2018-12-03 18:21:27,912 INFO L276 IsEmpty]: Start isEmpty. Operand 2641 states and 2743 transitions. [2018-12-03 18:21:27,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-12-03 18:21:27,913 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:21:27,913 INFO L402 BasicCegarLoop]: trace histogram [140, 139, 2, 1, 1, 1] [2018-12-03 18:21:27,913 INFO L423 AbstractCegarLoop]: === Iteration 107 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:21:27,913 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:21:27,914 INFO L82 PathProgramCache]: Analyzing trace with hash 1987887238, now seen corresponding path program 104 times [2018-12-03 18:21:27,914 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:21:27,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:27,914 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:21:27,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:27,914 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:21:27,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:31,781 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 18:21:31,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:31,781 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:21:31,781 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:21:31,782 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:21:31,782 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:31,782 INFO 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 18:21:31,790 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:21:31,790 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:21:31,911 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:21:31,911 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:21:31,921 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:21:33,729 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 18:21:33,729 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:21:36,169 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 18:21:36,187 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:21:36,187 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 35, 35] total 172 [2018-12-03 18:21:36,187 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:21:36,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 139 states [2018-12-03 18:21:36,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2018-12-03 18:21:36,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7842, Invalid=21570, Unknown=0, NotChecked=0, Total=29412 [2018-12-03 18:21:36,190 INFO L87 Difference]: Start difference. First operand 2641 states and 2743 transitions. Second operand 139 states. [2018-12-03 18:21:48,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:21:48,259 INFO L93 Difference]: Finished difference Result 5184 states and 5396 transitions. [2018-12-03 18:21:48,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 203 states. [2018-12-03 18:21:48,260 INFO L78 Accepts]: Start accepts. Automaton has 139 states. Word has length 284 [2018-12-03 18:21:48,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:21:48,262 INFO L225 Difference]: With dead ends: 5184 [2018-12-03 18:21:48,262 INFO L226 Difference]: Without dead ends: 2751 [2018-12-03 18:21:48,266 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 840 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 338 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22901 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=32418, Invalid=82842, Unknown=0, NotChecked=0, Total=115260 [2018-12-03 18:21:48,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2751 states. [2018-12-03 18:21:48,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2751 to 2719. [2018-12-03 18:21:48,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2719 states. [2018-12-03 18:21:48,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2719 states to 2719 states and 2823 transitions. [2018-12-03 18:21:48,315 INFO L78 Accepts]: Start accepts. Automaton has 2719 states and 2823 transitions. Word has length 284 [2018-12-03 18:21:48,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:21:48,315 INFO L480 AbstractCegarLoop]: Abstraction has 2719 states and 2823 transitions. [2018-12-03 18:21:48,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has 139 states. [2018-12-03 18:21:48,316 INFO L276 IsEmpty]: Start isEmpty. Operand 2719 states and 2823 transitions. [2018-12-03 18:21:48,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2018-12-03 18:21:48,317 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:21:48,318 INFO L402 BasicCegarLoop]: trace histogram [141, 140, 2, 1, 1, 1] [2018-12-03 18:21:48,318 INFO L423 AbstractCegarLoop]: === Iteration 108 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:21:48,318 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:21:48,318 INFO L82 PathProgramCache]: Analyzing trace with hash 1610635264, now seen corresponding path program 105 times [2018-12-03 18:21:48,318 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:21:48,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:48,319 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:21:48,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:48,319 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:21:48,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:52,289 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 18:21:52,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:52,289 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:21:52,289 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:21:52,289 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:21:52,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:52,289 INFO 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 18:21:52,298 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:21:52,298 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:21:52,406 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:21:52,406 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:21:52,411 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:21:52,469 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 18:21:52,470 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:22:04,211 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 18:22:04,229 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:22:04,230 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106, 106] total 211 [2018-12-03 18:22:04,230 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:22:04,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-03 18:22:04,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-03 18:22:04,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22366, Invalid=22366, Unknown=0, NotChecked=0, Total=44732 [2018-12-03 18:22:04,233 INFO L87 Difference]: Start difference. First operand 2719 states and 2823 transitions. Second operand 107 states. [2018-12-03 18:22:04,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:22:04,607 INFO L93 Difference]: Finished difference Result 5230 states and 5438 transitions. [2018-12-03 18:22:04,607 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2018-12-03 18:22:04,607 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 286 [2018-12-03 18:22:04,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:22:04,609 INFO L225 Difference]: With dead ends: 5230 [2018-12-03 18:22:04,609 INFO L226 Difference]: Without dead ends: 2721 [2018-12-03 18:22:04,612 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 676 GetRequests, 466 SyntacticMatches, 0 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=22366, Invalid=22366, Unknown=0, NotChecked=0, Total=44732 [2018-12-03 18:22:04,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2721 states. [2018-12-03 18:22:04,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2721 to 2721. [2018-12-03 18:22:04,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2721 states. [2018-12-03 18:22:04,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2721 states to 2721 states and 2825 transitions. [2018-12-03 18:22:04,654 INFO L78 Accepts]: Start accepts. Automaton has 2721 states and 2825 transitions. Word has length 286 [2018-12-03 18:22:04,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:22:04,654 INFO L480 AbstractCegarLoop]: Abstraction has 2721 states and 2825 transitions. [2018-12-03 18:22:04,654 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-03 18:22:04,654 INFO L276 IsEmpty]: Start isEmpty. Operand 2721 states and 2825 transitions. [2018-12-03 18:22:04,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2018-12-03 18:22:04,656 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:22:04,656 INFO L402 BasicCegarLoop]: trace histogram [142, 141, 2, 1, 1, 1] [2018-12-03 18:22:04,656 INFO L423 AbstractCegarLoop]: === Iteration 109 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:22:04,656 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:22:04,656 INFO L82 PathProgramCache]: Analyzing trace with hash 1118023802, now seen corresponding path program 106 times [2018-12-03 18:22:04,656 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:22:04,657 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:04,657 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:22:04,657 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:04,657 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:22:04,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:08,862 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 18:22:08,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:08,863 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:22:08,863 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:22:08,863 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:22:08,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:08,863 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 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 18:22:08,871 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:22:08,871 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:22:08,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:08,980 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:22:09,044 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 18:22:09,044 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:22:20,959 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 18:22:20,977 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:22:20,978 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [107, 107, 107] total 213 [2018-12-03 18:22:20,978 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:22:20,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 108 states [2018-12-03 18:22:20,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2018-12-03 18:22:20,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22791, Invalid=22791, Unknown=0, NotChecked=0, Total=45582 [2018-12-03 18:22:20,981 INFO L87 Difference]: Start difference. First operand 2721 states and 2825 transitions. Second operand 108 states. [2018-12-03 18:22:21,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:22:21,416 INFO L93 Difference]: Finished difference Result 5232 states and 5440 transitions. [2018-12-03 18:22:21,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2018-12-03 18:22:21,417 INFO L78 Accepts]: Start accepts. Automaton has 108 states. Word has length 288 [2018-12-03 18:22:21,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:22:21,418 INFO L225 Difference]: With dead ends: 5232 [2018-12-03 18:22:21,419 INFO L226 Difference]: Without dead ends: 2723 [2018-12-03 18:22:21,421 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 681 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=22791, Invalid=22791, Unknown=0, NotChecked=0, Total=45582 [2018-12-03 18:22:21,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2723 states. [2018-12-03 18:22:21,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2723 to 2723. [2018-12-03 18:22:21,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2723 states. [2018-12-03 18:22:21,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2723 states to 2723 states and 2827 transitions. [2018-12-03 18:22:21,468 INFO L78 Accepts]: Start accepts. Automaton has 2723 states and 2827 transitions. Word has length 288 [2018-12-03 18:22:21,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:22:21,468 INFO L480 AbstractCegarLoop]: Abstraction has 2723 states and 2827 transitions. [2018-12-03 18:22:21,468 INFO L481 AbstractCegarLoop]: Interpolant automaton has 108 states. [2018-12-03 18:22:21,468 INFO L276 IsEmpty]: Start isEmpty. Operand 2723 states and 2827 transitions. [2018-12-03 18:22:21,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2018-12-03 18:22:21,470 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:22:21,470 INFO L402 BasicCegarLoop]: trace histogram [143, 142, 2, 1, 1, 1] [2018-12-03 18:22:21,471 INFO L423 AbstractCegarLoop]: === Iteration 110 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:22:21,471 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:22:21,471 INFO L82 PathProgramCache]: Analyzing trace with hash 164811380, now seen corresponding path program 107 times [2018-12-03 18:22:21,471 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:22:21,472 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:21,472 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:22:21,472 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:21,472 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:22:21,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:25,745 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 18:22:25,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:25,746 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:22:25,746 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:22:25,746 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:22:25,746 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:25,746 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 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 18:22:25,755 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:22:25,755 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:22:25,876 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:22:25,876 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:22:25,879 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:22:27,659 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 18:22:27,659 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:22:30,361 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 18:22:30,379 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:22:30,380 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [108, 36, 36] total 177 [2018-12-03 18:22:30,380 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:22:30,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 143 states [2018-12-03 18:22:30,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2018-12-03 18:22:30,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8300, Invalid=22852, Unknown=0, NotChecked=0, Total=31152 [2018-12-03 18:22:30,382 INFO L87 Difference]: Start difference. First operand 2723 states and 2827 transitions. Second operand 143 states. [2018-12-03 18:22:42,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:22:42,656 INFO L93 Difference]: Finished difference Result 5343 states and 5558 transitions. [2018-12-03 18:22:42,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 209 states. [2018-12-03 18:22:42,656 INFO L78 Accepts]: Start accepts. Automaton has 143 states. Word has length 290 [2018-12-03 18:22:42,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:22:42,658 INFO L225 Difference]: With dead ends: 5343 [2018-12-03 18:22:42,658 INFO L226 Difference]: Without dead ends: 2834 [2018-12-03 18:22:42,662 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 18:22:42,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2834 states. [2018-12-03 18:22:42,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2834 to 2801. [2018-12-03 18:22:42,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2801 states. [2018-12-03 18:22:42,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2801 states to 2801 states and 2907 transitions. [2018-12-03 18:22:42,712 INFO L78 Accepts]: Start accepts. Automaton has 2801 states and 2907 transitions. Word has length 290 [2018-12-03 18:22:42,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:22:42,712 INFO L480 AbstractCegarLoop]: Abstraction has 2801 states and 2907 transitions. [2018-12-03 18:22:42,712 INFO L481 AbstractCegarLoop]: Interpolant automaton has 143 states. [2018-12-03 18:22:42,712 INFO L276 IsEmpty]: Start isEmpty. Operand 2801 states and 2907 transitions. [2018-12-03 18:22:42,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2018-12-03 18:22:42,714 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:22:42,714 INFO L402 BasicCegarLoop]: trace histogram [144, 143, 2, 1, 1, 1] [2018-12-03 18:22:42,714 INFO L423 AbstractCegarLoop]: === Iteration 111 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:22:42,714 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:22:42,715 INFO L82 PathProgramCache]: Analyzing trace with hash -627972498, now seen corresponding path program 108 times [2018-12-03 18:22:42,715 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:22:42,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:42,715 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:22:42,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:42,715 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:22:42,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:47,126 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 18:22:47,126 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:47,126 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:22:47,126 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:22:47,126 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:22:47,127 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:47,127 INFO 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 18:22:47,135 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:22:47,135 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:22:47,244 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:22:47,244 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:22:47,249 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:22:47,315 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 18:22:47,316 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:22:59,270 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 18:22:59,289 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:22:59,289 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [109, 109, 109] total 217 [2018-12-03 18:22:59,289 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:22:59,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2018-12-03 18:22:59,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2018-12-03 18:22:59,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23653, Invalid=23653, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 18:22:59,293 INFO L87 Difference]: Start difference. First operand 2801 states and 2907 transitions. Second operand 110 states. [2018-12-03 18:22:59,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:22:59,858 INFO L93 Difference]: Finished difference Result 5388 states and 5600 transitions. [2018-12-03 18:22:59,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2018-12-03 18:22:59,858 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 292 [2018-12-03 18:22:59,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:22:59,860 INFO L225 Difference]: With dead ends: 5388 [2018-12-03 18:22:59,860 INFO L226 Difference]: Without dead ends: 2803 [2018-12-03 18:22:59,863 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 691 GetRequests, 475 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=23653, Invalid=23653, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 18:22:59,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2803 states. [2018-12-03 18:22:59,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2803 to 2803. [2018-12-03 18:22:59,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2803 states. [2018-12-03 18:22:59,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2803 states to 2803 states and 2909 transitions. [2018-12-03 18:22:59,913 INFO L78 Accepts]: Start accepts. Automaton has 2803 states and 2909 transitions. Word has length 292 [2018-12-03 18:22:59,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:22:59,913 INFO L480 AbstractCegarLoop]: Abstraction has 2803 states and 2909 transitions. [2018-12-03 18:22:59,913 INFO L481 AbstractCegarLoop]: Interpolant automaton has 110 states. [2018-12-03 18:22:59,913 INFO L276 IsEmpty]: Start isEmpty. Operand 2803 states and 2909 transitions. [2018-12-03 18:22:59,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2018-12-03 18:22:59,915 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:22:59,915 INFO L402 BasicCegarLoop]: trace histogram [145, 144, 2, 1, 1, 1] [2018-12-03 18:22:59,915 INFO L423 AbstractCegarLoop]: === Iteration 112 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:22:59,916 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:22:59,916 INFO L82 PathProgramCache]: Analyzing trace with hash 1359706984, now seen corresponding path program 109 times [2018-12-03 18:22:59,916 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:22:59,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:59,916 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:22:59,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:59,916 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:22:59,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:23:04,077 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 18:23:04,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:04,077 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:23:04,077 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:23:04,077 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:23:04,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:04,078 INFO 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 18:23:04,086 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:23:04,086 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:23:04,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:23:04,198 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:23:04,298 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 18:23:04,298 INFO L316 TraceCheckSpWp]: Computing backward predicates...