java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_exp_cong.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/up.i_4.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 16:46:23,213 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 16:46:23,215 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 16:46:23,230 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 16:46:23,230 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 16:46:23,231 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 16:46:23,235 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 16:46:23,239 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 16:46:23,240 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 16:46:23,241 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 16:46:23,245 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-12-03 16:46:23,288 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_exp_cong.epf [2018-12-03 16:46:23,317 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 16:46:23,317 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 16:46:23,318 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 16:46:23,318 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 16:46:23,318 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 16:46:23,318 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 16:46:23,319 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 16:46:23,319 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 16:46:23,319 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-03 16:46:23,319 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 16:46:23,319 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-03 16:46:23,320 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 16:46:23,320 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 16:46:23,320 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 16:46:23,320 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 16:46:23,324 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 16:46:23,324 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 16:46:23,325 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 16:46:23,325 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 16:46:23,325 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 16:46:23,325 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 16:46:23,325 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 16:46:23,326 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 16:46:23,327 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 16:46:23,327 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 16:46:23,327 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 16:46:23,327 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 16:46:23,327 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 16:46:23,328 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 16:46:23,328 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 16:46:23,328 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 16:46:23,328 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 16:46:23,328 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 16:46:23,329 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 16:46:23,329 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 16:46:23,329 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 16:46:23,330 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 16:46:23,330 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 16:46:23,330 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 16:46:23,331 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 16:46:23,331 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 16:46:23,380 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 16:46:23,397 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 16:46:23,402 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 16:46:23,403 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 16:46:23,404 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 16:46:23,405 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/up.i_4.bpl [2018-12-03 16:46:23,405 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/up.i_4.bpl' [2018-12-03 16:46:23,448 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 16:46:23,450 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 16:46:23,451 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 16:46:23,451 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 16:46:23,451 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 16:46:23,470 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:46:23" (1/1) ... [2018-12-03 16:46:23,480 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:46:23" (1/1) ... [2018-12-03 16:46:23,490 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 16:46:23,491 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 16:46:23,491 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 16:46:23,491 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 16:46:23,503 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:46:23" (1/1) ... [2018-12-03 16:46:23,503 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:46:23" (1/1) ... [2018-12-03 16:46:23,504 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:46:23" (1/1) ... [2018-12-03 16:46:23,505 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:46:23" (1/1) ... [2018-12-03 16:46:23,509 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:46:23" (1/1) ... [2018-12-03 16:46:23,511 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:46:23" (1/1) ... [2018-12-03 16:46:23,512 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:46:23" (1/1) ... [2018-12-03 16:46:23,513 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 16:46:23,514 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 16:46:23,514 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 16:46:23,514 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 16:46:23,515 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:46:23" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 16:46:23,586 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 16:46:23,587 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 16:46:23,847 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 16:46:23,848 INFO L280 CfgBuilder]: Removed 2 assue(true) statements. [2018-12-03 16:46:23,848 INFO L202 PluginConnector]: Adding new model up.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 04:46:23 BoogieIcfgContainer [2018-12-03 16:46:23,849 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 16:46:23,850 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 16:46:23,850 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 16:46:23,853 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 16:46:23,854 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:46:23" (1/2) ... [2018-12-03 16:46:23,855 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d8c38c3 and model type up.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 04:46:23, skipping insertion in model container [2018-12-03 16:46:23,855 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 04:46:23" (2/2) ... [2018-12-03 16:46:23,857 INFO L112 eAbstractionObserver]: Analyzing ICFG up.i_4.bpl [2018-12-03 16:46:23,867 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 16:46:23,875 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 16:46:23,895 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 16:46:23,932 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 16:46:23,932 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 16:46:23,932 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 16:46:23,933 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 16:46:23,933 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 16:46:23,933 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 16:46:23,933 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 16:46:23,933 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 16:46:23,950 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states. [2018-12-03 16:46:23,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-03 16:46:23,957 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:23,957 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-12-03 16:46:23,960 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:23,966 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:23,967 INFO L82 PathProgramCache]: Analyzing trace with hash 28787237, now seen corresponding path program 1 times [2018-12-03 16:46:23,970 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:24,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:24,024 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:24,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:24,024 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:24,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:24,293 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:24,296 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:46:24,299 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 16:46:24,299 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:46:24,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 16:46:24,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 16:46:24,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 16:46:24,359 INFO L87 Difference]: Start difference. First operand 8 states. Second operand 4 states. [2018-12-03 16:46:24,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:24,523 INFO L93 Difference]: Finished difference Result 14 states and 17 transitions. [2018-12-03 16:46:24,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 16:46:24,525 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 5 [2018-12-03 16:46:24,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:24,539 INFO L225 Difference]: With dead ends: 14 [2018-12-03 16:46:24,540 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 16:46:24,543 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-12-03 16:46:24,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 16:46:24,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 16:46:24,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 16:46:24,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2018-12-03 16:46:24,580 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 5 [2018-12-03 16:46:24,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:24,580 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2018-12-03 16:46:24,580 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 16:46:24,580 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2018-12-03 16:46:24,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 16:46:24,581 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:24,581 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-12-03 16:46:24,581 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:24,582 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:24,582 INFO L82 PathProgramCache]: Analyzing trace with hash 894126414, now seen corresponding path program 1 times [2018-12-03 16:46:24,582 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:24,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:24,583 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:24,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:24,583 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:24,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:24,652 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:24,653 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:46:24,653 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-12-03 16:46:24,653 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:46:24,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 16:46:24,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 16:46:24,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-12-03 16:46:24,656 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand 5 states. [2018-12-03 16:46:24,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:24,747 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2018-12-03 16:46:24,747 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 16:46:24,747 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 6 [2018-12-03 16:46:24,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:24,748 INFO L225 Difference]: With dead ends: 15 [2018-12-03 16:46:24,748 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 16:46:24,749 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2018-12-03 16:46:24,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 16:46:24,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 9. [2018-12-03 16:46:24,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 16:46:24,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2018-12-03 16:46:24,753 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2018-12-03 16:46:24,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:24,753 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2018-12-03 16:46:24,753 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 16:46:24,754 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2018-12-03 16:46:24,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 16:46:24,754 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:24,754 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2018-12-03 16:46:24,755 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:24,755 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:24,755 INFO L82 PathProgramCache]: Analyzing trace with hash 261957866, now seen corresponding path program 1 times [2018-12-03 16:46:24,755 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:24,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:24,757 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:24,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:24,757 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:24,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:24,862 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:24,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:24,862 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:24,863 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 9 with the following transitions: [2018-12-03 16:46:24,865 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9], [13], [15], [17] [2018-12-03 16:46:24,911 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:46:24,911 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:46:25,210 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:46:25,211 INFO L272 AbstractInterpreter]: Visited 7 different actions 26 times. Merged at 6 different actions 16 times. Widened at 2 different actions 2 times. Found 5 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 16:46:25,234 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:25,236 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:46:25,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:25,236 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:25,253 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:25,253 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:46:25,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:25,292 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:25,577 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:25,578 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:25,629 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:25,650 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:25,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2018-12-03 16:46:25,650 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:25,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 16:46:25,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 16:46:25,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-12-03 16:46:25,652 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 8 states. [2018-12-03 16:46:25,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:25,806 INFO L93 Difference]: Finished difference Result 17 states and 19 transitions. [2018-12-03 16:46:25,808 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 16:46:25,809 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 8 [2018-12-03 16:46:25,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:25,809 INFO L225 Difference]: With dead ends: 17 [2018-12-03 16:46:25,810 INFO L226 Difference]: Without dead ends: 10 [2018-12-03 16:46:25,811 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2018-12-03 16:46:25,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-12-03 16:46:25,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-12-03 16:46:25,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-12-03 16:46:25,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2018-12-03 16:46:25,815 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 8 [2018-12-03 16:46:25,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:25,815 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2018-12-03 16:46:25,816 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 16:46:25,816 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2018-12-03 16:46:25,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 16:46:25,816 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:25,817 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2018-12-03 16:46:25,817 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:25,817 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:25,818 INFO L82 PathProgramCache]: Analyzing trace with hash 1187669281, now seen corresponding path program 2 times [2018-12-03 16:46:25,818 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:25,819 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:25,819 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:25,819 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:25,819 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:25,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:26,052 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:26,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:26,053 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:26,053 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:26,054 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:26,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:26,054 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:26,067 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:46:26,068 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:46:26,083 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-12-03 16:46:26,083 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:26,085 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:26,126 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:26,126 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:26,202 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:26,224 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:26,224 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 7 [2018-12-03 16:46:26,224 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:26,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 16:46:26,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 16:46:26,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-12-03 16:46:26,225 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand 8 states. [2018-12-03 16:46:26,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:26,378 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2018-12-03 16:46:26,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 16:46:26,379 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 9 [2018-12-03 16:46:26,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:26,380 INFO L225 Difference]: With dead ends: 18 [2018-12-03 16:46:26,380 INFO L226 Difference]: Without dead ends: 16 [2018-12-03 16:46:26,381 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 13 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2018-12-03 16:46:26,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-12-03 16:46:26,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 12. [2018-12-03 16:46:26,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-12-03 16:46:26,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2018-12-03 16:46:26,386 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 9 [2018-12-03 16:46:26,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:26,386 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2018-12-03 16:46:26,387 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 16:46:26,387 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2018-12-03 16:46:26,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-12-03 16:46:26,387 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:26,388 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2018-12-03 16:46:26,388 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:26,388 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:26,388 INFO L82 PathProgramCache]: Analyzing trace with hash -1111188483, now seen corresponding path program 3 times [2018-12-03 16:46:26,389 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:26,390 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:26,390 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:26,390 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:26,390 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:26,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:26,605 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:26,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:26,605 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:26,606 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:26,606 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:26,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:26,606 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:26,626 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:46:26,626 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:46:26,666 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:46:26,666 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:26,668 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:26,947 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:26,948 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:27,000 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:27,019 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:27,019 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 10 [2018-12-03 16:46:27,019 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:27,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 16:46:27,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 16:46:27,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2018-12-03 16:46:27,021 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 11 states. [2018-12-03 16:46:27,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:27,181 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2018-12-03 16:46:27,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 16:46:27,181 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 11 [2018-12-03 16:46:27,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:27,182 INFO L225 Difference]: With dead ends: 22 [2018-12-03 16:46:27,182 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 16:46:27,183 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 13 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2018-12-03 16:46:27,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 16:46:27,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-12-03 16:46:27,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-12-03 16:46:27,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-12-03 16:46:27,187 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2018-12-03 16:46:27,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:27,187 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-12-03 16:46:27,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 16:46:27,187 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-12-03 16:46:27,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 16:46:27,188 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:27,188 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1] [2018-12-03 16:46:27,189 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:27,189 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:27,189 INFO L82 PathProgramCache]: Analyzing trace with hash -1227431834, now seen corresponding path program 4 times [2018-12-03 16:46:27,189 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:27,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:27,190 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:27,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:27,191 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:27,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:27,410 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:27,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:27,411 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:27,411 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:27,411 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:27,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:27,412 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:27,421 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:27,421 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:46:27,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:27,450 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:27,525 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:27,526 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:27,573 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:27,593 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:27,593 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 8 [2018-12-03 16:46:27,593 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:27,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 16:46:27,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 16:46:27,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-12-03 16:46:27,594 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 9 states. [2018-12-03 16:46:27,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:27,741 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2018-12-03 16:46:27,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 16:46:27,742 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 12 [2018-12-03 16:46:27,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:27,743 INFO L225 Difference]: With dead ends: 21 [2018-12-03 16:46:27,743 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 16:46:27,743 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 6 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2018-12-03 16:46:27,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 16:46:27,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2018-12-03 16:46:27,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 16:46:27,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-12-03 16:46:27,747 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2018-12-03 16:46:27,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:27,748 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-12-03 16:46:27,748 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 16:46:27,748 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-12-03 16:46:27,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 16:46:27,749 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:27,749 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1] [2018-12-03 16:46:27,749 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:27,749 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:27,749 INFO L82 PathProgramCache]: Analyzing trace with hash 1553947138, now seen corresponding path program 5 times [2018-12-03 16:46:27,749 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:27,750 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:27,750 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:27,750 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:27,751 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:27,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:27,930 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:27,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:27,930 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:27,930 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:27,931 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:27,931 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:27,931 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:27,947 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:46:27,947 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:46:27,976 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 16:46:27,976 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:27,978 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:28,116 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:28,116 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:28,323 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:28,341 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:28,342 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2018-12-03 16:46:28,342 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:28,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 16:46:28,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 16:46:28,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2018-12-03 16:46:28,343 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 14 states. [2018-12-03 16:46:28,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:28,453 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2018-12-03 16:46:28,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 16:46:28,453 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2018-12-03 16:46:28,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:28,454 INFO L225 Difference]: With dead ends: 27 [2018-12-03 16:46:28,454 INFO L226 Difference]: Without dead ends: 16 [2018-12-03 16:46:28,455 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 16 SyntacticMatches, 7 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=215, Unknown=0, NotChecked=0, Total=306 [2018-12-03 16:46:28,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-12-03 16:46:28,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-12-03 16:46:28,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-12-03 16:46:28,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-12-03 16:46:28,460 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2018-12-03 16:46:28,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:28,460 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-12-03 16:46:28,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 16:46:28,460 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-12-03 16:46:28,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-12-03 16:46:28,461 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:28,461 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1] [2018-12-03 16:46:28,461 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:28,461 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:28,461 INFO L82 PathProgramCache]: Analyzing trace with hash 291918073, now seen corresponding path program 6 times [2018-12-03 16:46:28,461 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:28,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:28,463 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:28,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:28,463 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:28,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:28,576 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:28,577 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:28,577 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:28,577 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:28,577 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:28,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:28,578 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:28,595 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:46:28,595 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:46:28,609 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:46:28,609 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:28,611 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:28,631 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:28,632 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:28,709 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:28,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:28,728 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 9 [2018-12-03 16:46:28,728 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:28,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 16:46:28,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 16:46:28,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-12-03 16:46:28,729 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 10 states. [2018-12-03 16:46:28,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:28,892 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2018-12-03 16:46:28,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 16:46:28,895 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 15 [2018-12-03 16:46:28,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:28,896 INFO L225 Difference]: With dead ends: 24 [2018-12-03 16:46:28,896 INFO L226 Difference]: Without dead ends: 22 [2018-12-03 16:46:28,897 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 8 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=131, Unknown=0, NotChecked=0, Total=210 [2018-12-03 16:46:28,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-03 16:46:28,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 18. [2018-12-03 16:46:28,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-12-03 16:46:28,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-12-03 16:46:28,902 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 15 [2018-12-03 16:46:28,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:28,902 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-12-03 16:46:28,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 16:46:28,903 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-12-03 16:46:28,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-12-03 16:46:28,903 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:28,903 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1] [2018-12-03 16:46:28,904 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:28,904 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:28,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1360327125, now seen corresponding path program 7 times [2018-12-03 16:46:28,904 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:28,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:28,905 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:28,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:28,905 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:28,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:29,078 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 20 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:29,078 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:29,078 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:29,078 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:29,079 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:29,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:29,079 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:29,089 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:29,089 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:46:29,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:29,120 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:29,236 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 20 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:29,237 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:29,331 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 20 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:29,350 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:29,351 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 16 [2018-12-03 16:46:29,351 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:29,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:46:29,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:46:29,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:46:29,352 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 17 states. [2018-12-03 16:46:29,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:29,569 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2018-12-03 16:46:29,569 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 16:46:29,569 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 17 [2018-12-03 16:46:29,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:29,569 INFO L225 Difference]: With dead ends: 32 [2018-12-03 16:46:29,570 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 16:46:29,570 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 19 SyntacticMatches, 9 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2018-12-03 16:46:29,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 16:46:29,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-12-03 16:46:29,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 16:46:29,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-12-03 16:46:29,576 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2018-12-03 16:46:29,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:29,576 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-12-03 16:46:29,576 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:46:29,576 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-12-03 16:46:29,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 16:46:29,577 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:29,577 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1] [2018-12-03 16:46:29,577 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:29,578 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:29,578 INFO L82 PathProgramCache]: Analyzing trace with hash -1898806402, now seen corresponding path program 8 times [2018-12-03 16:46:29,578 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:29,579 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:29,579 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:29,579 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:29,580 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:29,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:29,760 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:29,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:29,761 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:29,761 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:29,761 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:29,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:29,762 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:29,772 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:46:29,772 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:46:29,791 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-12-03 16:46:29,791 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:29,794 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:29,828 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:29,828 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:29,911 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:29,932 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:29,932 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 10 [2018-12-03 16:46:29,932 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:29,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 16:46:29,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 16:46:29,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2018-12-03 16:46:29,933 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 11 states. [2018-12-03 16:46:30,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:30,385 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2018-12-03 16:46:30,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 16:46:30,385 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2018-12-03 16:46:30,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:30,386 INFO L225 Difference]: With dead ends: 27 [2018-12-03 16:46:30,386 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 16:46:30,387 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 28 SyntacticMatches, 10 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=102, Invalid=170, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:46:30,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 16:46:30,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 21. [2018-12-03 16:46:30,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 16:46:30,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-12-03 16:46:30,392 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2018-12-03 16:46:30,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:30,393 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-12-03 16:46:30,393 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 16:46:30,393 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-12-03 16:46:30,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 16:46:30,394 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:30,394 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1] [2018-12-03 16:46:30,394 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:30,394 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:30,395 INFO L82 PathProgramCache]: Analyzing trace with hash 608081690, now seen corresponding path program 9 times [2018-12-03 16:46:30,395 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:30,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:30,396 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:30,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:30,396 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:30,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:30,713 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:30,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:30,714 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:30,714 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:30,714 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:30,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:30,715 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:30,724 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:46:30,724 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:46:30,739 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:46:30,740 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:30,743 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:30,959 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:30,960 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:31,082 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:31,101 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:31,101 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 19 [2018-12-03 16:46:31,101 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:31,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 16:46:31,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 16:46:31,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:46:31,103 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 20 states. [2018-12-03 16:46:31,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:31,590 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2018-12-03 16:46:31,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 16:46:31,591 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 20 [2018-12-03 16:46:31,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:31,592 INFO L225 Difference]: With dead ends: 37 [2018-12-03 16:46:31,592 INFO L226 Difference]: Without dead ends: 22 [2018-12-03 16:46:31,593 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 22 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=178, Invalid=472, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:46:31,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-03 16:46:31,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-12-03 16:46:31,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-12-03 16:46:31,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-12-03 16:46:31,598 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 20 [2018-12-03 16:46:31,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:31,598 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-12-03 16:46:31,598 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 16:46:31,598 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-12-03 16:46:31,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:46:31,599 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:31,599 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1] [2018-12-03 16:46:31,599 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:31,599 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:31,599 INFO L82 PathProgramCache]: Analyzing trace with hash -208127791, now seen corresponding path program 10 times [2018-12-03 16:46:31,600 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:31,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:31,600 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:31,601 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:31,601 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:31,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:31,995 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:31,996 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:31,996 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:31,996 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:31,996 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:31,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:31,997 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:32,005 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:32,005 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:46:32,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:32,037 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:32,091 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:32,091 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:32,234 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:32,253 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:32,254 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 11 [2018-12-03 16:46:32,254 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:32,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 16:46:32,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 16:46:32,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2018-12-03 16:46:32,255 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 12 states. [2018-12-03 16:46:32,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:32,458 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2018-12-03 16:46:32,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 16:46:32,459 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2018-12-03 16:46:32,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:32,460 INFO L225 Difference]: With dead ends: 30 [2018-12-03 16:46:32,460 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 16:46:32,460 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 33 SyntacticMatches, 12 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=128, Invalid=214, Unknown=0, NotChecked=0, Total=342 [2018-12-03 16:46:32,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 16:46:32,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 24. [2018-12-03 16:46:32,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-03 16:46:32,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-12-03 16:46:32,466 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2018-12-03 16:46:32,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:32,467 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-12-03 16:46:32,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 16:46:32,467 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-12-03 16:46:32,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 16:46:32,468 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:32,468 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1] [2018-12-03 16:46:32,468 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:32,469 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:32,469 INFO L82 PathProgramCache]: Analyzing trace with hash 1852588973, now seen corresponding path program 11 times [2018-12-03 16:46:32,469 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:32,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:32,470 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:32,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:32,470 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:32,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:32,819 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:32,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:32,820 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:32,820 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:32,820 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:32,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:32,821 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:32,831 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:46:32,831 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:46:32,855 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-12-03 16:46:32,856 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:32,857 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:32,996 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:32,996 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:33,066 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:33,085 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:33,085 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 22 [2018-12-03 16:46:33,085 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:33,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 16:46:33,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 16:46:33,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-12-03 16:46:33,087 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 23 states. [2018-12-03 16:46:33,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:33,350 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2018-12-03 16:46:33,350 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 16:46:33,350 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 23 [2018-12-03 16:46:33,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:33,351 INFO L225 Difference]: With dead ends: 42 [2018-12-03 16:46:33,351 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 16:46:33,352 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 25 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=232, Invalid=638, Unknown=0, NotChecked=0, Total=870 [2018-12-03 16:46:33,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 16:46:33,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-12-03 16:46:33,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 16:46:33,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-12-03 16:46:33,358 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 23 [2018-12-03 16:46:33,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:33,358 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2018-12-03 16:46:33,358 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 16:46:33,358 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2018-12-03 16:46:33,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 16:46:33,359 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:33,359 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1] [2018-12-03 16:46:33,360 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:33,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:33,360 INFO L82 PathProgramCache]: Analyzing trace with hash -34196842, now seen corresponding path program 12 times [2018-12-03 16:46:33,360 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:33,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:33,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:33,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:33,361 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:33,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:33,519 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:33,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:33,519 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:33,520 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:33,520 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:33,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:33,520 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:33,529 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:46:33,529 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:46:33,548 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:46:33,549 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:33,551 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:33,592 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:33,593 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:33,746 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:33,765 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:33,765 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 12 [2018-12-03 16:46:33,765 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:33,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 16:46:33,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 16:46:33,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2018-12-03 16:46:33,767 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 13 states. [2018-12-03 16:46:34,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:34,015 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2018-12-03 16:46:34,015 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 16:46:34,016 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-12-03 16:46:34,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:34,017 INFO L225 Difference]: With dead ends: 33 [2018-12-03 16:46:34,017 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 16:46:34,018 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 38 SyntacticMatches, 14 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=263, Unknown=0, NotChecked=0, Total=420 [2018-12-03 16:46:34,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 16:46:34,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 27. [2018-12-03 16:46:34,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 16:46:34,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-12-03 16:46:34,025 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2018-12-03 16:46:34,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:34,025 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-12-03 16:46:34,025 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 16:46:34,025 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-12-03 16:46:34,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 16:46:34,026 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:34,026 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1] [2018-12-03 16:46:34,026 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:34,027 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:34,027 INFO L82 PathProgramCache]: Analyzing trace with hash 1496506418, now seen corresponding path program 13 times [2018-12-03 16:46:34,027 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:34,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:34,028 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:34,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:34,028 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:34,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:34,349 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:34,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:34,350 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:34,350 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:34,350 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:34,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:34,351 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:34,360 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:34,361 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:46:34,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:34,393 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:34,559 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:34,559 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:34,709 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:34,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:34,728 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 25 [2018-12-03 16:46:34,728 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:34,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 16:46:34,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 16:46:34,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:46:34,729 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 26 states. [2018-12-03 16:46:35,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:35,055 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-12-03 16:46:35,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 16:46:35,055 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 26 [2018-12-03 16:46:35,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:35,056 INFO L225 Difference]: With dead ends: 47 [2018-12-03 16:46:35,056 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 16:46:35,057 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 28 SyntacticMatches, 15 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=293, Invalid=829, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 16:46:35,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 16:46:35,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-12-03 16:46:35,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-03 16:46:35,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-12-03 16:46:35,063 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 26 [2018-12-03 16:46:35,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:35,063 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-12-03 16:46:35,063 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 16:46:35,063 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-12-03 16:46:35,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-03 16:46:35,064 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:35,064 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1] [2018-12-03 16:46:35,064 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:35,065 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:35,065 INFO L82 PathProgramCache]: Analyzing trace with hash 497294505, now seen corresponding path program 14 times [2018-12-03 16:46:35,065 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:35,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:35,066 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:35,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:35,066 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:35,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:35,219 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:35,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:35,219 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:35,220 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:35,220 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:35,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:35,220 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:35,228 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:46:35,228 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:46:35,280 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-12-03 16:46:35,280 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:35,283 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:35,318 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:35,318 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:35,401 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:35,420 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:35,420 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 13 [2018-12-03 16:46:35,420 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:35,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 16:46:35,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 16:46:35,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2018-12-03 16:46:35,421 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 14 states. [2018-12-03 16:46:35,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:35,563 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2018-12-03 16:46:35,564 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 16:46:35,564 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2018-12-03 16:46:35,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:35,564 INFO L225 Difference]: With dead ends: 36 [2018-12-03 16:46:35,565 INFO L226 Difference]: Without dead ends: 34 [2018-12-03 16:46:35,565 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 43 SyntacticMatches, 16 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=189, Invalid=317, Unknown=0, NotChecked=0, Total=506 [2018-12-03 16:46:35,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-12-03 16:46:35,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2018-12-03 16:46:35,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-03 16:46:35,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-12-03 16:46:35,571 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 27 [2018-12-03 16:46:35,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:35,572 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-12-03 16:46:35,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 16:46:35,572 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-12-03 16:46:35,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-12-03 16:46:35,573 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:35,573 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1] [2018-12-03 16:46:35,573 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:35,573 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:35,574 INFO L82 PathProgramCache]: Analyzing trace with hash 1158582661, now seen corresponding path program 15 times [2018-12-03 16:46:35,574 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:35,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:35,574 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:35,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:35,575 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:35,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:35,860 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 72 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:35,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:35,860 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:35,861 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:35,861 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:35,861 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:35,861 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:35,870 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:46:35,871 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:46:35,891 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:46:35,891 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:35,894 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:36,137 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 72 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:36,138 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:36,385 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 72 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:36,405 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:36,405 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 28 [2018-12-03 16:46:36,405 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:36,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 16:46:36,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 16:46:36,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2018-12-03 16:46:36,406 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 29 states. [2018-12-03 16:46:36,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:36,683 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2018-12-03 16:46:36,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 16:46:36,683 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 29 [2018-12-03 16:46:36,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:36,684 INFO L225 Difference]: With dead ends: 52 [2018-12-03 16:46:36,684 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 16:46:36,685 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 31 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=361, Invalid=1045, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 16:46:36,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 16:46:36,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-12-03 16:46:36,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 16:46:36,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-12-03 16:46:36,691 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 29 [2018-12-03 16:46:36,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:36,691 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-12-03 16:46:36,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 16:46:36,691 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-12-03 16:46:36,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 16:46:36,692 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:36,692 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1] [2018-12-03 16:46:36,692 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:36,692 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:36,692 INFO L82 PathProgramCache]: Analyzing trace with hash 2054811054, now seen corresponding path program 16 times [2018-12-03 16:46:36,693 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:36,693 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:36,693 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:36,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:36,694 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:36,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:36,961 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:36,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:36,962 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:36,962 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:36,962 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:36,963 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:36,963 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:36,972 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:36,972 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:46:36,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:36,995 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:37,022 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:37,022 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:37,143 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:37,165 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:37,166 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 14 [2018-12-03 16:46:37,166 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:37,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 16:46:37,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 16:46:37,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=127, Unknown=0, NotChecked=0, Total=210 [2018-12-03 16:46:37,167 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 15 states. [2018-12-03 16:46:37,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:37,539 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-12-03 16:46:37,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 16:46:37,548 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 30 [2018-12-03 16:46:37,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:37,548 INFO L225 Difference]: With dead ends: 39 [2018-12-03 16:46:37,549 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 16:46:37,549 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 48 SyntacticMatches, 18 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=224, Invalid=376, Unknown=0, NotChecked=0, Total=600 [2018-12-03 16:46:37,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 16:46:37,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33. [2018-12-03 16:46:37,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-03 16:46:37,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-12-03 16:46:37,557 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2018-12-03 16:46:37,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:37,557 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-12-03 16:46:37,557 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 16:46:37,557 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-12-03 16:46:37,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 16:46:37,560 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:37,560 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1] [2018-12-03 16:46:37,560 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:37,560 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:37,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1011600054, now seen corresponding path program 17 times [2018-12-03 16:46:37,561 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:37,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:37,562 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:37,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:37,562 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:37,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:38,004 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 90 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:38,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:38,004 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:38,004 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:38,005 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:38,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:38,005 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:38,013 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:46:38,013 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:46:38,038 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-12-03 16:46:38,039 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:38,041 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:38,259 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 90 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:38,259 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:38,444 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 90 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:38,463 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:38,464 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 31 [2018-12-03 16:46:38,464 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:38,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 16:46:38,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 16:46:38,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2018-12-03 16:46:38,465 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 32 states. [2018-12-03 16:46:39,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:39,209 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-12-03 16:46:39,209 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-03 16:46:39,209 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 32 [2018-12-03 16:46:39,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:39,210 INFO L225 Difference]: With dead ends: 57 [2018-12-03 16:46:39,210 INFO L226 Difference]: Without dead ends: 34 [2018-12-03 16:46:39,211 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 34 SyntacticMatches, 19 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=436, Invalid=1286, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 16:46:39,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-12-03 16:46:39,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-12-03 16:46:39,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-12-03 16:46:39,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2018-12-03 16:46:39,219 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 32 [2018-12-03 16:46:39,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:39,219 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2018-12-03 16:46:39,219 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 16:46:39,219 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2018-12-03 16:46:39,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-12-03 16:46:39,220 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:39,220 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1] [2018-12-03 16:46:39,220 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:39,221 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:39,221 INFO L82 PathProgramCache]: Analyzing trace with hash 1011743873, now seen corresponding path program 18 times [2018-12-03 16:46:39,221 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:39,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:39,222 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:39,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:39,222 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:39,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:39,425 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:39,426 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:39,426 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:39,426 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:39,426 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:39,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:39,427 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:39,435 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:46:39,435 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:46:39,464 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:46:39,464 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:39,466 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:39,505 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:39,505 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:39,895 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:39,929 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:39,930 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 15 [2018-12-03 16:46:39,930 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:39,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 16:46:39,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 16:46:39,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=144, Unknown=0, NotChecked=0, Total=240 [2018-12-03 16:46:39,931 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 16 states. [2018-12-03 16:46:40,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:40,404 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2018-12-03 16:46:40,404 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 16:46:40,404 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2018-12-03 16:46:40,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:40,405 INFO L225 Difference]: With dead ends: 42 [2018-12-03 16:46:40,405 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 16:46:40,406 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 53 SyntacticMatches, 20 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=262, Invalid=440, Unknown=0, NotChecked=0, Total=702 [2018-12-03 16:46:40,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 16:46:40,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 36. [2018-12-03 16:46:40,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-12-03 16:46:40,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-12-03 16:46:40,414 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 33 [2018-12-03 16:46:40,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:40,414 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-12-03 16:46:40,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 16:46:40,414 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-12-03 16:46:40,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-12-03 16:46:40,415 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:40,415 INFO L402 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1] [2018-12-03 16:46:40,415 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:40,416 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:40,416 INFO L82 PathProgramCache]: Analyzing trace with hash 1623186269, now seen corresponding path program 19 times [2018-12-03 16:46:40,416 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:40,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:40,417 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:40,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:40,417 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:40,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:40,728 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 110 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:40,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:40,728 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:40,728 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:40,728 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:40,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:40,728 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:40,738 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:40,738 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:46:40,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:40,763 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:40,979 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 110 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:40,979 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:41,639 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 110 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:41,657 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:41,657 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 34 [2018-12-03 16:46:41,658 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:41,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 16:46:41,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 16:46:41,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=892, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 16:46:41,659 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 35 states. [2018-12-03 16:46:41,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:41,939 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2018-12-03 16:46:41,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 16:46:41,939 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 35 [2018-12-03 16:46:41,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:41,939 INFO L225 Difference]: With dead ends: 62 [2018-12-03 16:46:41,939 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 16:46:41,940 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 37 SyntacticMatches, 21 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 640 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=518, Invalid=1552, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 16:46:41,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 16:46:41,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-12-03 16:46:41,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 16:46:41,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-12-03 16:46:41,947 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 35 [2018-12-03 16:46:41,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:41,947 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2018-12-03 16:46:41,947 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 16:46:41,947 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2018-12-03 16:46:41,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-12-03 16:46:41,948 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:41,948 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1] [2018-12-03 16:46:41,948 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:41,948 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:41,948 INFO L82 PathProgramCache]: Analyzing trace with hash -803883834, now seen corresponding path program 20 times [2018-12-03 16:46:41,948 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:41,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:41,949 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:41,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:41,949 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:41,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:42,130 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:42,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:42,130 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:42,130 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:42,130 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:42,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:42,130 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:42,140 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:46:42,140 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:46:42,218 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-12-03 16:46:42,218 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:42,220 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:42,251 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:42,252 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:42,421 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:42,440 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:42,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 16 [2018-12-03 16:46:42,441 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:42,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:46:42,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:46:42,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=162, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:46:42,442 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 17 states. [2018-12-03 16:46:42,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:42,646 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2018-12-03 16:46:42,648 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 16:46:42,648 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 36 [2018-12-03 16:46:42,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:42,648 INFO L225 Difference]: With dead ends: 45 [2018-12-03 16:46:42,648 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 16:46:42,649 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 58 SyntacticMatches, 22 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=303, Invalid=509, Unknown=0, NotChecked=0, Total=812 [2018-12-03 16:46:42,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 16:46:42,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 39. [2018-12-03 16:46:42,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 16:46:42,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-12-03 16:46:42,657 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2018-12-03 16:46:42,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:42,658 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-12-03 16:46:42,658 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:46:42,658 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-12-03 16:46:42,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 16:46:42,658 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:42,659 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1] [2018-12-03 16:46:42,659 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:42,659 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:42,659 INFO L82 PathProgramCache]: Analyzing trace with hash 561682018, now seen corresponding path program 21 times [2018-12-03 16:46:42,659 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:42,660 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:42,660 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:42,660 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:42,660 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:42,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:42,955 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 132 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:42,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:42,955 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:42,955 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:42,955 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:42,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:42,956 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:42,965 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:46:42,965 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:46:42,989 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:46:42,989 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:42,991 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:43,243 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 132 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:43,243 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:43,434 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 132 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:43,454 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:43,454 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 37 [2018-12-03 16:46:43,454 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:43,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 16:46:43,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 16:46:43,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 16:46:43,455 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 38 states. [2018-12-03 16:46:43,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:43,926 INFO L93 Difference]: Finished difference Result 67 states and 69 transitions. [2018-12-03 16:46:43,926 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 16:46:43,926 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 38 [2018-12-03 16:46:43,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:43,927 INFO L225 Difference]: With dead ends: 67 [2018-12-03 16:46:43,927 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 16:46:43,928 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 40 SyntacticMatches, 23 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 770 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=607, Invalid=1843, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 16:46:43,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 16:46:43,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-12-03 16:46:43,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-12-03 16:46:43,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2018-12-03 16:46:43,939 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 38 [2018-12-03 16:46:43,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:43,939 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2018-12-03 16:46:43,939 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 16:46:43,939 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2018-12-03 16:46:43,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-12-03 16:46:43,940 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:43,940 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1] [2018-12-03 16:46:43,940 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:43,940 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:43,940 INFO L82 PathProgramCache]: Analyzing trace with hash 1490671705, now seen corresponding path program 22 times [2018-12-03 16:46:43,940 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:43,941 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:43,941 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:43,941 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:43,941 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:43,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:44,697 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:44,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:44,697 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:44,697 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:44,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:44,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:44,698 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:44,707 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:44,707 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:46:44,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:44,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:44,961 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:44,961 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:46,148 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:46,167 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:46,167 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 17 [2018-12-03 16:46:46,167 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:46,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 16:46:46,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 16:46:46,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=181, Unknown=0, NotChecked=0, Total=306 [2018-12-03 16:46:46,168 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 18 states. [2018-12-03 16:46:46,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:46,416 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2018-12-03 16:46:46,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 16:46:46,416 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 39 [2018-12-03 16:46:46,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:46,417 INFO L225 Difference]: With dead ends: 48 [2018-12-03 16:46:46,417 INFO L226 Difference]: Without dead ends: 46 [2018-12-03 16:46:46,418 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 63 SyntacticMatches, 24 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=347, Invalid=583, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:46:46,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-12-03 16:46:46,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2018-12-03 16:46:46,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-03 16:46:46,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-12-03 16:46:46,428 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 39 [2018-12-03 16:46:46,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:46,428 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-12-03 16:46:46,428 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 16:46:46,429 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-12-03 16:46:46,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-12-03 16:46:46,429 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:46,429 INFO L402 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1] [2018-12-03 16:46:46,429 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:46,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:46,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1983635147, now seen corresponding path program 23 times [2018-12-03 16:46:46,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:46,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:46,431 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:46,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:46,431 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:46,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:46,926 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 156 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:46,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:46,926 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:46,926 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:46,926 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:46,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:46,927 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:46,938 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:46:46,938 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:46:46,982 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-12-03 16:46:46,982 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:46,985 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:47,417 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 156 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:47,417 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:47,668 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 156 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:47,687 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:47,688 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 40 [2018-12-03 16:46:47,688 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:47,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 16:46:47,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 16:46:47,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 16:46:47,689 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 41 states. [2018-12-03 16:46:48,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:48,238 INFO L93 Difference]: Finished difference Result 72 states and 74 transitions. [2018-12-03 16:46:48,238 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-03 16:46:48,238 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 41 [2018-12-03 16:46:48,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:48,239 INFO L225 Difference]: With dead ends: 72 [2018-12-03 16:46:48,239 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 16:46:48,240 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 43 SyntacticMatches, 25 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 912 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=703, Invalid=2159, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 16:46:48,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 16:46:48,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-12-03 16:46:48,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-12-03 16:46:48,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-12-03 16:46:48,248 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 41 [2018-12-03 16:46:48,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:48,248 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-12-03 16:46:48,248 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 16:46:48,248 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-12-03 16:46:48,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 16:46:48,249 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:48,249 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1] [2018-12-03 16:46:48,249 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:48,250 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:48,250 INFO L82 PathProgramCache]: Analyzing trace with hash 1073842142, now seen corresponding path program 24 times [2018-12-03 16:46:48,250 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:48,250 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:48,251 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:48,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:48,251 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:48,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:49,219 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:49,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:49,220 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:49,220 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:49,220 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:49,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:49,220 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:49,228 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:46:49,229 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:46:49,261 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:46:49,261 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:49,263 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:49,308 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:49,309 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:49,477 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:49,497 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:49,497 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 18 [2018-12-03 16:46:49,497 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:49,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 16:46:49,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 16:46:49,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=201, Unknown=0, NotChecked=0, Total=342 [2018-12-03 16:46:49,498 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 19 states. [2018-12-03 16:46:49,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:49,737 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2018-12-03 16:46:49,738 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 16:46:49,738 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2018-12-03 16:46:49,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:49,739 INFO L225 Difference]: With dead ends: 51 [2018-12-03 16:46:49,739 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 16:46:49,740 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 68 SyntacticMatches, 26 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=394, Invalid=662, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 16:46:49,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 16:46:49,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 45. [2018-12-03 16:46:49,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 16:46:49,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-12-03 16:46:49,749 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2018-12-03 16:46:49,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:49,749 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-12-03 16:46:49,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 16:46:49,749 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-12-03 16:46:49,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 16:46:49,750 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:49,750 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1] [2018-12-03 16:46:49,750 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:49,750 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:49,750 INFO L82 PathProgramCache]: Analyzing trace with hash 1170080634, now seen corresponding path program 25 times [2018-12-03 16:46:49,750 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:49,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:49,751 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:49,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:49,751 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:49,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:50,374 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 182 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:50,374 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:50,375 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:50,375 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:50,375 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:50,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:50,375 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:50,383 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:50,383 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:46:50,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:50,415 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:50,828 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 182 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:50,829 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:51,151 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 182 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:51,170 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:51,170 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 43 [2018-12-03 16:46:51,170 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:51,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 16:46:51,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 16:46:51,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 16:46:51,172 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 44 states. [2018-12-03 16:46:51,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:51,619 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2018-12-03 16:46:51,619 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-03 16:46:51,619 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 44 [2018-12-03 16:46:51,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:51,620 INFO L225 Difference]: With dead ends: 77 [2018-12-03 16:46:51,620 INFO L226 Difference]: Without dead ends: 46 [2018-12-03 16:46:51,621 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 46 SyntacticMatches, 27 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1066 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=806, Invalid=2500, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 16:46:51,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-12-03 16:46:51,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-12-03 16:46:51,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-12-03 16:46:51,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-12-03 16:46:51,628 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 44 [2018-12-03 16:46:51,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:51,628 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-12-03 16:46:51,628 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 16:46:51,628 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-12-03 16:46:51,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-12-03 16:46:51,628 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:51,628 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1] [2018-12-03 16:46:51,629 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:51,629 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:51,629 INFO L82 PathProgramCache]: Analyzing trace with hash -1190416335, now seen corresponding path program 26 times [2018-12-03 16:46:51,629 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:51,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:51,630 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:51,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:51,630 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:51,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:52,460 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:52,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:52,461 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:52,461 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:52,461 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:52,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:52,461 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:52,470 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:46:52,471 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:46:52,515 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-12-03 16:46:52,515 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:52,517 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:52,549 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:52,549 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:52,763 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:52,782 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:52,783 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 19 [2018-12-03 16:46:52,783 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:52,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 16:46:52,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 16:46:52,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=222, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:46:52,784 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 20 states. [2018-12-03 16:46:53,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:53,031 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2018-12-03 16:46:53,031 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 16:46:53,032 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2018-12-03 16:46:53,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:53,032 INFO L225 Difference]: With dead ends: 54 [2018-12-03 16:46:53,032 INFO L226 Difference]: Without dead ends: 52 [2018-12-03 16:46:53,033 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 73 SyntacticMatches, 28 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=444, Invalid=746, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 16:46:53,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-03 16:46:53,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 48. [2018-12-03 16:46:53,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-03 16:46:53,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-12-03 16:46:53,040 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 45 [2018-12-03 16:46:53,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:53,040 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-12-03 16:46:53,040 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 16:46:53,040 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-12-03 16:46:53,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-12-03 16:46:53,040 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:53,040 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1] [2018-12-03 16:46:53,041 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:53,041 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:53,041 INFO L82 PathProgramCache]: Analyzing trace with hash -1528863987, now seen corresponding path program 27 times [2018-12-03 16:46:53,041 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:53,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:53,041 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:53,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:53,042 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:53,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:53,457 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 210 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:53,458 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:53,458 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:53,458 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:53,458 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:53,459 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:53,459 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:53,469 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:46:53,470 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:46:53,507 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:46:53,508 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:53,510 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:53,911 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 210 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:53,911 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:54,502 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 210 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:54,522 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:54,522 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 46 [2018-12-03 16:46:54,522 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:54,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 16:46:54,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 16:46:54,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 16:46:54,523 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 47 states. [2018-12-03 16:46:54,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:54,983 INFO L93 Difference]: Finished difference Result 82 states and 84 transitions. [2018-12-03 16:46:54,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-03 16:46:54,983 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 47 [2018-12-03 16:46:54,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:54,984 INFO L225 Difference]: With dead ends: 82 [2018-12-03 16:46:54,984 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 16:46:54,986 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 49 SyntacticMatches, 29 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=916, Invalid=2866, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 16:46:54,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 16:46:54,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-12-03 16:46:54,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 16:46:54,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-12-03 16:46:54,992 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 47 [2018-12-03 16:46:54,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:54,993 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-12-03 16:46:54,993 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 16:46:54,993 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-12-03 16:46:54,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 16:46:54,993 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:54,993 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1] [2018-12-03 16:46:54,994 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:54,994 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:54,994 INFO L82 PathProgramCache]: Analyzing trace with hash -1594530058, now seen corresponding path program 28 times [2018-12-03 16:46:54,994 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:54,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:54,995 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:54,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:54,995 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:55,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:55,224 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:55,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:55,224 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:55,225 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:55,225 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:55,225 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:55,225 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:55,234 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:55,235 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:46:55,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:55,273 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:55,309 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:55,309 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:55,504 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:55,523 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:55,523 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 20 [2018-12-03 16:46:55,523 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:55,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 16:46:55,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 16:46:55,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=244, Unknown=0, NotChecked=0, Total=420 [2018-12-03 16:46:55,524 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 21 states. [2018-12-03 16:46:55,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:55,790 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2018-12-03 16:46:55,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 16:46:55,790 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 48 [2018-12-03 16:46:55,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:55,791 INFO L225 Difference]: With dead ends: 57 [2018-12-03 16:46:55,791 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 16:46:55,792 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 78 SyntacticMatches, 30 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 527 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=497, Invalid=835, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 16:46:55,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 16:46:55,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2018-12-03 16:46:55,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 16:46:55,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-12-03 16:46:55,799 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2018-12-03 16:46:55,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:55,800 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-12-03 16:46:55,800 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 16:46:55,800 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-12-03 16:46:55,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 16:46:55,800 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:55,800 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1] [2018-12-03 16:46:55,800 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:55,801 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:55,801 INFO L82 PathProgramCache]: Analyzing trace with hash 959872146, now seen corresponding path program 29 times [2018-12-03 16:46:55,801 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:55,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:55,801 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:55,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:55,802 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:55,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:56,282 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 240 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:56,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:56,282 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:56,282 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:56,283 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:56,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:56,283 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:56,291 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:46:56,291 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:46:56,341 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-12-03 16:46:56,342 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:56,344 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:56,822 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 240 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:56,822 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:57,133 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 240 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:57,154 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:57,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 49 [2018-12-03 16:46:57,155 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:57,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 16:46:57,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 16:46:57,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 16:46:57,157 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 50 states. [2018-12-03 16:46:57,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:57,705 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2018-12-03 16:46:57,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-12-03 16:46:57,705 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 50 [2018-12-03 16:46:57,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:57,705 INFO L225 Difference]: With dead ends: 87 [2018-12-03 16:46:57,706 INFO L226 Difference]: Without dead ends: 52 [2018-12-03 16:46:57,707 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 52 SyntacticMatches, 31 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1410 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1033, Invalid=3257, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 16:46:57,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-03 16:46:57,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-12-03 16:46:57,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-12-03 16:46:57,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2018-12-03 16:46:57,714 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 50 [2018-12-03 16:46:57,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:57,714 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2018-12-03 16:46:57,714 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 16:46:57,714 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2018-12-03 16:46:57,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-12-03 16:46:57,715 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:57,715 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1] [2018-12-03 16:46:57,715 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:57,715 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:57,715 INFO L82 PathProgramCache]: Analyzing trace with hash -1087929335, now seen corresponding path program 30 times [2018-12-03 16:46:57,715 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:57,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:57,716 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:57,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:57,716 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:57,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:58,667 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:58,667 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:58,667 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:58,667 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:58,668 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:58,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:58,668 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:46:58,676 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:46:58,676 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:46:58,712 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:46:58,712 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:58,714 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:58,742 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:58,742 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:59,112 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:46:59,131 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:59,131 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 21 [2018-12-03 16:46:59,131 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:59,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 16:46:59,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 16:46:59,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=267, Unknown=0, NotChecked=0, Total=462 [2018-12-03 16:46:59,133 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand 22 states. [2018-12-03 16:46:59,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:59,719 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2018-12-03 16:46:59,719 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 16:46:59,719 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2018-12-03 16:46:59,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:59,720 INFO L225 Difference]: With dead ends: 60 [2018-12-03 16:46:59,720 INFO L226 Difference]: Without dead ends: 58 [2018-12-03 16:46:59,720 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 83 SyntacticMatches, 32 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=553, Invalid=929, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 16:46:59,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-03 16:46:59,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 54. [2018-12-03 16:46:59,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-12-03 16:46:59,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-12-03 16:46:59,733 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 51 [2018-12-03 16:46:59,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:59,733 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-12-03 16:46:59,733 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 16:46:59,733 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-12-03 16:46:59,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-12-03 16:46:59,734 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:59,734 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1] [2018-12-03 16:46:59,734 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:59,734 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:59,734 INFO L82 PathProgramCache]: Analyzing trace with hash -1823104795, now seen corresponding path program 31 times [2018-12-03 16:46:59,734 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:59,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:59,735 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:59,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:59,736 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:59,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:00,270 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 272 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:00,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:00,270 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:00,270 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:00,270 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:00,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:00,271 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:00,280 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:00,280 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:47:00,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:00,318 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:00,848 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 272 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:00,848 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:01,189 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 272 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:01,208 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:01,208 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 52 [2018-12-03 16:47:01,208 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:01,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 16:47:01,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 16:47:01,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 16:47:01,210 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 53 states. [2018-12-03 16:47:02,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:02,093 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2018-12-03 16:47:02,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-12-03 16:47:02,093 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 53 [2018-12-03 16:47:02,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:02,094 INFO L225 Difference]: With dead ends: 92 [2018-12-03 16:47:02,094 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 16:47:02,096 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 55 SyntacticMatches, 33 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1600 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1157, Invalid=3673, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 16:47:02,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 16:47:02,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-12-03 16:47:02,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-03 16:47:02,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2018-12-03 16:47:02,104 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 53 [2018-12-03 16:47:02,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:02,104 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2018-12-03 16:47:02,104 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 16:47:02,104 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2018-12-03 16:47:02,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 16:47:02,105 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:02,105 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1] [2018-12-03 16:47:02,105 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:02,105 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:02,106 INFO L82 PathProgramCache]: Analyzing trace with hash 2133414414, now seen corresponding path program 32 times [2018-12-03 16:47:02,106 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:02,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:02,106 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:02,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:02,107 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:02,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:02,377 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:02,377 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:02,377 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:02,377 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:02,377 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:02,377 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:02,377 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:02,386 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:47:02,386 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:47:02,434 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-12-03 16:47:02,434 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:02,437 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:02,457 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:02,457 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:02,757 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:02,776 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:02,777 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 22 [2018-12-03 16:47:02,777 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:02,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 16:47:02,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 16:47:02,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=291, Unknown=0, NotChecked=0, Total=506 [2018-12-03 16:47:02,778 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 23 states. [2018-12-03 16:47:03,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:03,116 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-12-03 16:47:03,117 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 16:47:03,117 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 54 [2018-12-03 16:47:03,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:03,118 INFO L225 Difference]: With dead ends: 63 [2018-12-03 16:47:03,118 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 16:47:03,120 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 88 SyntacticMatches, 34 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 665 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=612, Invalid=1028, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 16:47:03,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 16:47:03,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 57. [2018-12-03 16:47:03,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-03 16:47:03,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-12-03 16:47:03,131 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2018-12-03 16:47:03,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:03,131 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-12-03 16:47:03,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 16:47:03,132 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-12-03 16:47:03,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-12-03 16:47:03,132 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:03,132 INFO L402 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1] [2018-12-03 16:47:03,132 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:03,133 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:03,133 INFO L82 PathProgramCache]: Analyzing trace with hash 1511784874, now seen corresponding path program 33 times [2018-12-03 16:47:03,133 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:03,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:03,134 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:03,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:03,134 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:03,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:03,636 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 306 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:03,636 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:03,636 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:03,636 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:03,637 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:03,637 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:03,637 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:03,646 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:47:03,646 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:47:03,684 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:47:03,685 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:03,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:04,249 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 306 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:04,249 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:04,914 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 306 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:04,934 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:04,934 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 55 [2018-12-03 16:47:04,934 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:04,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-12-03 16:47:04,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-12-03 16:47:04,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=2341, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 16:47:04,935 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 56 states. [2018-12-03 16:47:05,418 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-12-03 16:47:05,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:05,823 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2018-12-03 16:47:05,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-12-03 16:47:05,823 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 56 [2018-12-03 16:47:05,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:05,823 INFO L225 Difference]: With dead ends: 97 [2018-12-03 16:47:05,824 INFO L226 Difference]: Without dead ends: 58 [2018-12-03 16:47:05,824 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 58 SyntacticMatches, 35 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1802 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1288, Invalid=4114, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 16:47:05,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-03 16:47:05,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-12-03 16:47:05,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-12-03 16:47:05,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2018-12-03 16:47:05,834 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 56 [2018-12-03 16:47:05,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:05,834 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2018-12-03 16:47:05,834 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-12-03 16:47:05,834 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2018-12-03 16:47:05,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-12-03 16:47:05,835 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:05,835 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1] [2018-12-03 16:47:05,835 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:05,835 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:05,835 INFO L82 PathProgramCache]: Analyzing trace with hash -906931231, now seen corresponding path program 34 times [2018-12-03 16:47:05,836 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:05,836 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:05,836 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:05,836 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:05,836 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:05,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:06,357 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:06,357 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:06,357 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:06,357 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:06,357 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:06,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:06,358 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:06,376 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:06,376 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:47:06,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:06,416 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:06,642 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:06,643 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:06,926 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:06,946 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:06,946 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 23 [2018-12-03 16:47:06,946 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:06,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 16:47:06,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 16:47:06,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2018-12-03 16:47:06,947 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 24 states. [2018-12-03 16:47:07,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:07,277 INFO L93 Difference]: Finished difference Result 66 states and 67 transitions. [2018-12-03 16:47:07,278 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 16:47:07,278 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 57 [2018-12-03 16:47:07,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:07,279 INFO L225 Difference]: With dead ends: 66 [2018-12-03 16:47:07,279 INFO L226 Difference]: Without dead ends: 64 [2018-12-03 16:47:07,279 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 93 SyntacticMatches, 36 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 740 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=674, Invalid=1132, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 16:47:07,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-12-03 16:47:07,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 60. [2018-12-03 16:47:07,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-12-03 16:47:07,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-12-03 16:47:07,290 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 57 [2018-12-03 16:47:07,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:07,290 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-12-03 16:47:07,290 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 16:47:07,291 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-12-03 16:47:07,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-12-03 16:47:07,291 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:07,291 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1] [2018-12-03 16:47:07,291 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:07,292 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:07,292 INFO L82 PathProgramCache]: Analyzing trace with hash 317381309, now seen corresponding path program 35 times [2018-12-03 16:47:07,292 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:07,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:07,293 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:07,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:07,293 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:07,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:07,884 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 342 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:07,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:07,885 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:07,885 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:07,885 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:07,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:07,885 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:07,894 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:47:07,895 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:47:07,958 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-12-03 16:47:07,958 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:07,961 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:08,554 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 342 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:08,555 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:09,005 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 342 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:09,025 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:09,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 58 [2018-12-03 16:47:09,025 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:09,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 16:47:09,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 16:47:09,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 16:47:09,027 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 59 states. [2018-12-03 16:47:10,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:10,071 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2018-12-03 16:47:10,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-12-03 16:47:10,071 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 59 [2018-12-03 16:47:10,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:10,071 INFO L225 Difference]: With dead ends: 102 [2018-12-03 16:47:10,072 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 16:47:10,073 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 61 SyntacticMatches, 37 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2016 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1426, Invalid=4580, Unknown=0, NotChecked=0, Total=6006 [2018-12-03 16:47:10,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 16:47:10,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-12-03 16:47:10,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-12-03 16:47:10,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2018-12-03 16:47:10,084 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 59 [2018-12-03 16:47:10,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:10,085 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2018-12-03 16:47:10,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 16:47:10,085 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2018-12-03 16:47:10,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-12-03 16:47:10,085 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:10,085 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1] [2018-12-03 16:47:10,086 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:10,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:10,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1012222246, now seen corresponding path program 36 times [2018-12-03 16:47:10,086 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:10,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:10,087 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:10,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:10,087 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:10,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:10,554 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:10,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:10,555 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:10,555 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:10,555 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:10,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:10,555 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:10,564 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:47:10,564 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:47:10,612 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:47:10,612 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:10,615 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:10,775 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:10,775 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:11,193 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:11,214 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:11,214 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 24 [2018-12-03 16:47:11,214 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:11,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-03 16:47:11,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-03 16:47:11,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=342, Unknown=0, NotChecked=0, Total=600 [2018-12-03 16:47:11,215 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 25 states. [2018-12-03 16:47:11,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:11,608 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-12-03 16:47:11,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 16:47:11,608 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 60 [2018-12-03 16:47:11,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:11,609 INFO L225 Difference]: With dead ends: 69 [2018-12-03 16:47:11,609 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 16:47:11,610 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 98 SyntacticMatches, 38 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 819 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=739, Invalid=1241, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 16:47:11,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 16:47:11,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 63. [2018-12-03 16:47:11,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 16:47:11,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-12-03 16:47:11,625 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 60 [2018-12-03 16:47:11,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:11,626 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-12-03 16:47:11,626 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-03 16:47:11,626 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-12-03 16:47:11,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 16:47:11,626 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:11,626 INFO L402 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1] [2018-12-03 16:47:11,627 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:11,627 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:11,627 INFO L82 PathProgramCache]: Analyzing trace with hash 2082902722, now seen corresponding path program 37 times [2018-12-03 16:47:11,627 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:11,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:11,628 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:11,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:11,628 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:11,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:12,268 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 380 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:12,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:12,269 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:12,269 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:12,269 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:12,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:12,269 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:12,278 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:12,278 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:47:12,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:12,327 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:12,982 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 380 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:12,982 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:14,067 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 380 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:14,086 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:14,087 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 61 [2018-12-03 16:47:14,087 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:14,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-12-03 16:47:14,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-12-03 16:47:14,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2881, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 16:47:14,088 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 62 states. [2018-12-03 16:47:15,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:15,223 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2018-12-03 16:47:15,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-12-03 16:47:15,223 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 62 [2018-12-03 16:47:15,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:15,224 INFO L225 Difference]: With dead ends: 107 [2018-12-03 16:47:15,224 INFO L226 Difference]: Without dead ends: 64 [2018-12-03 16:47:15,225 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 64 SyntacticMatches, 39 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2242 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1571, Invalid=5071, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 16:47:15,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-12-03 16:47:15,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2018-12-03 16:47:15,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-12-03 16:47:15,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2018-12-03 16:47:15,235 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 62 [2018-12-03 16:47:15,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:15,235 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2018-12-03 16:47:15,235 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-12-03 16:47:15,236 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2018-12-03 16:47:15,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-12-03 16:47:15,236 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:15,236 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1] [2018-12-03 16:47:15,236 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:15,236 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:15,236 INFO L82 PathProgramCache]: Analyzing trace with hash 346890169, now seen corresponding path program 38 times [2018-12-03 16:47:15,236 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:15,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:15,237 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:15,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:15,237 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:15,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:15,578 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 210 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:15,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:15,578 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:15,578 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:15,579 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:15,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:15,579 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:15,587 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:47:15,587 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:47:15,648 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-12-03 16:47:15,649 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:15,651 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:15,689 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 210 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:15,690 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:16,106 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 210 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:16,127 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:16,127 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 25 [2018-12-03 16:47:16,127 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:16,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 16:47:16,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 16:47:16,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=369, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:47:16,128 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand 26 states. [2018-12-03 16:47:16,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:16,506 INFO L93 Difference]: Finished difference Result 72 states and 73 transitions. [2018-12-03 16:47:16,506 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 16:47:16,506 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 63 [2018-12-03 16:47:16,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:16,506 INFO L225 Difference]: With dead ends: 72 [2018-12-03 16:47:16,507 INFO L226 Difference]: Without dead ends: 70 [2018-12-03 16:47:16,507 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 103 SyntacticMatches, 40 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 902 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=807, Invalid=1355, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 16:47:16,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-12-03 16:47:16,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2018-12-03 16:47:16,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-03 16:47:16,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-12-03 16:47:16,520 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 63 [2018-12-03 16:47:16,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:16,520 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-12-03 16:47:16,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 16:47:16,520 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-12-03 16:47:16,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-12-03 16:47:16,521 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:16,521 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1] [2018-12-03 16:47:16,521 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:16,521 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:16,521 INFO L82 PathProgramCache]: Analyzing trace with hash -1646063467, now seen corresponding path program 39 times [2018-12-03 16:47:16,521 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:16,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:16,522 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:16,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:16,522 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:16,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:17,275 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 420 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:17,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:17,275 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:17,275 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:17,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:17,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:17,276 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:17,284 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:47:17,285 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:47:17,333 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:47:17,334 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:17,337 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:18,084 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 420 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:18,084 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:18,662 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 420 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:18,680 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:18,681 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 64 [2018-12-03 16:47:18,681 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:18,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 16:47:18,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 16:47:18,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 16:47:18,682 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 65 states. [2018-12-03 16:47:20,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:20,058 INFO L93 Difference]: Finished difference Result 112 states and 114 transitions. [2018-12-03 16:47:20,058 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 16:47:20,059 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 65 [2018-12-03 16:47:20,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:20,059 INFO L225 Difference]: With dead ends: 112 [2018-12-03 16:47:20,060 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 16:47:20,061 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 67 SyntacticMatches, 41 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2480 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1723, Invalid=5587, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 16:47:20,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 16:47:20,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-12-03 16:47:20,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-12-03 16:47:20,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-12-03 16:47:20,076 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 65 [2018-12-03 16:47:20,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:20,076 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-12-03 16:47:20,076 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 16:47:20,077 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-12-03 16:47:20,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-12-03 16:47:20,077 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:20,077 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1] [2018-12-03 16:47:20,077 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:20,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:20,078 INFO L82 PathProgramCache]: Analyzing trace with hash 800148542, now seen corresponding path program 40 times [2018-12-03 16:47:20,078 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:20,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:20,078 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:20,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:20,079 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:20,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:21,688 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 231 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:21,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:21,688 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:21,688 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:21,688 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:21,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:21,688 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:21,697 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:21,697 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:47:21,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:21,749 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:21,883 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 231 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:21,883 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:22,316 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 231 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:22,335 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:22,335 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 26 [2018-12-03 16:47:22,335 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:22,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 16:47:22,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 16:47:22,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=397, Unknown=0, NotChecked=0, Total=702 [2018-12-03 16:47:22,336 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 27 states. [2018-12-03 16:47:22,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:22,733 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2018-12-03 16:47:22,733 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 16:47:22,734 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 66 [2018-12-03 16:47:22,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:22,735 INFO L225 Difference]: With dead ends: 75 [2018-12-03 16:47:22,735 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 16:47:22,736 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 108 SyntacticMatches, 42 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 989 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=878, Invalid=1474, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 16:47:22,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 16:47:22,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 69. [2018-12-03 16:47:22,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-03 16:47:22,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-12-03 16:47:22,753 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 66 [2018-12-03 16:47:22,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:22,753 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-12-03 16:47:22,753 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 16:47:22,753 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-12-03 16:47:22,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-12-03 16:47:22,754 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:22,754 INFO L402 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1] [2018-12-03 16:47:22,754 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:22,755 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:22,755 INFO L82 PathProgramCache]: Analyzing trace with hash 143536090, now seen corresponding path program 41 times [2018-12-03 16:47:22,755 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:22,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:22,756 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:22,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:22,756 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:22,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:23,471 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 462 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:23,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:23,472 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:23,472 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:23,472 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:23,472 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:23,472 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:23,481 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:47:23,481 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:47:23,546 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-12-03 16:47:23,546 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:23,549 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:24,416 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 462 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:24,416 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:25,242 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 462 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:25,261 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:25,261 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 67 [2018-12-03 16:47:25,261 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:25,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-12-03 16:47:25,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-12-03 16:47:25,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1079, Invalid=3477, Unknown=0, NotChecked=0, Total=4556 [2018-12-03 16:47:25,262 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 68 states. [2018-12-03 16:47:26,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:26,080 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2018-12-03 16:47:26,080 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-12-03 16:47:26,080 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 68 [2018-12-03 16:47:26,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:26,081 INFO L225 Difference]: With dead ends: 117 [2018-12-03 16:47:26,081 INFO L226 Difference]: Without dead ends: 70 [2018-12-03 16:47:26,081 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 70 SyntacticMatches, 43 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2730 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1882, Invalid=6128, Unknown=0, NotChecked=0, Total=8010 [2018-12-03 16:47:26,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-12-03 16:47:26,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-12-03 16:47:26,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-12-03 16:47:26,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2018-12-03 16:47:26,094 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 68 [2018-12-03 16:47:26,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:26,094 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2018-12-03 16:47:26,094 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-12-03 16:47:26,095 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2018-12-03 16:47:26,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-12-03 16:47:26,095 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:26,095 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1] [2018-12-03 16:47:26,095 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:26,095 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:26,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1759582319, now seen corresponding path program 42 times [2018-12-03 16:47:26,096 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:26,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:26,096 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:26,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:26,097 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:26,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:26,498 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 253 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:26,499 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:26,499 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:26,499 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:26,499 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:26,499 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:26,499 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:26,509 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:47:26,509 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:47:26,562 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:47:26,563 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:26,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:26,599 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 253 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:26,599 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:26,982 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 253 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:27,001 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:27,001 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 27 [2018-12-03 16:47:27,001 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:27,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-12-03 16:47:27,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-12-03 16:47:27,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=330, Invalid=426, Unknown=0, NotChecked=0, Total=756 [2018-12-03 16:47:27,002 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand 28 states. [2018-12-03 16:47:27,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:27,419 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2018-12-03 16:47:27,419 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-12-03 16:47:27,419 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 69 [2018-12-03 16:47:27,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:27,420 INFO L225 Difference]: With dead ends: 78 [2018-12-03 16:47:27,421 INFO L226 Difference]: Without dead ends: 76 [2018-12-03 16:47:27,421 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 113 SyntacticMatches, 44 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1080 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=952, Invalid=1598, Unknown=0, NotChecked=0, Total=2550 [2018-12-03 16:47:27,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-12-03 16:47:27,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 72. [2018-12-03 16:47:27,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-12-03 16:47:27,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-12-03 16:47:27,439 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 69 [2018-12-03 16:47:27,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:27,439 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-12-03 16:47:27,439 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-12-03 16:47:27,439 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-12-03 16:47:27,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-12-03 16:47:27,439 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:27,439 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1] [2018-12-03 16:47:27,440 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:27,440 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:27,440 INFO L82 PathProgramCache]: Analyzing trace with hash 1258439277, now seen corresponding path program 43 times [2018-12-03 16:47:27,440 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:27,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:27,441 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:27,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:27,441 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:27,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:28,235 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 506 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:28,235 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:28,236 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:28,236 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:28,236 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:28,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:28,236 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:28,244 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:28,244 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:47:28,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:28,305 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:29,174 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 506 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:29,175 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:29,818 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 506 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:29,837 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:29,837 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 70 [2018-12-03 16:47:29,837 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:29,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 16:47:29,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 16:47:29,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 16:47:29,838 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 71 states. [2018-12-03 16:47:30,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:30,871 INFO L93 Difference]: Finished difference Result 122 states and 124 transitions. [2018-12-03 16:47:30,871 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-03 16:47:30,871 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 71 [2018-12-03 16:47:30,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:30,871 INFO L225 Difference]: With dead ends: 122 [2018-12-03 16:47:30,871 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 16:47:30,872 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 73 SyntacticMatches, 45 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2992 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2048, Invalid=6694, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 16:47:30,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 16:47:30,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2018-12-03 16:47:30,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 16:47:30,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2018-12-03 16:47:30,885 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 71 [2018-12-03 16:47:30,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:30,885 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2018-12-03 16:47:30,886 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 16:47:30,886 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2018-12-03 16:47:30,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 16:47:30,886 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:30,886 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1] [2018-12-03 16:47:30,886 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:30,886 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:30,886 INFO L82 PathProgramCache]: Analyzing trace with hash -973776042, now seen corresponding path program 44 times [2018-12-03 16:47:30,887 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:30,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:30,887 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:30,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:30,887 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:30,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:31,254 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 276 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:31,255 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:31,255 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:31,255 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:31,255 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:31,255 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:31,255 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:31,266 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:47:31,266 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:47:31,340 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-12-03 16:47:31,340 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:31,343 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:31,377 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 276 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:31,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:31,792 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 276 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:31,813 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:31,813 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 28 [2018-12-03 16:47:31,813 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:31,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 16:47:31,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 16:47:31,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=456, Unknown=0, NotChecked=0, Total=812 [2018-12-03 16:47:31,814 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand 29 states. [2018-12-03 16:47:32,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:32,252 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2018-12-03 16:47:32,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 16:47:32,252 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2018-12-03 16:47:32,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:32,253 INFO L225 Difference]: With dead ends: 81 [2018-12-03 16:47:32,253 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 16:47:32,254 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 118 SyntacticMatches, 46 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1175 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1029, Invalid=1727, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 16:47:32,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 16:47:32,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 75. [2018-12-03 16:47:32,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-03 16:47:32,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-12-03 16:47:32,270 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 72 [2018-12-03 16:47:32,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:32,270 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-12-03 16:47:32,270 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 16:47:32,270 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-12-03 16:47:32,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-12-03 16:47:32,271 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:32,271 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1] [2018-12-03 16:47:32,271 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:32,271 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:32,271 INFO L82 PathProgramCache]: Analyzing trace with hash 504027378, now seen corresponding path program 45 times [2018-12-03 16:47:32,271 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:32,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:32,272 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:32,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:32,272 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:32,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:33,226 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 552 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:33,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:33,226 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:33,226 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:33,226 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:33,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:33,226 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:33,237 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:47:33,237 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:47:33,293 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:47:33,293 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:33,298 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:35,466 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 552 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:35,466 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:36,512 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 552 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:36,532 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:36,532 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 73 [2018-12-03 16:47:36,532 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:36,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-03 16:47:36,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-03 16:47:36,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 16:47:36,534 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 74 states. [2018-12-03 16:47:37,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:37,896 INFO L93 Difference]: Finished difference Result 127 states and 129 transitions. [2018-12-03 16:47:37,896 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-03 16:47:37,896 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 74 [2018-12-03 16:47:37,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:37,897 INFO L225 Difference]: With dead ends: 127 [2018-12-03 16:47:37,897 INFO L226 Difference]: Without dead ends: 76 [2018-12-03 16:47:37,898 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 76 SyntacticMatches, 47 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=2221, Invalid=7285, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 16:47:37,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-12-03 16:47:37,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2018-12-03 16:47:37,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-12-03 16:47:37,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2018-12-03 16:47:37,912 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 74 [2018-12-03 16:47:37,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:37,912 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2018-12-03 16:47:37,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-03 16:47:37,912 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2018-12-03 16:47:37,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-12-03 16:47:37,912 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:37,912 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1] [2018-12-03 16:47:37,912 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:37,913 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:37,913 INFO L82 PathProgramCache]: Analyzing trace with hash -443896983, now seen corresponding path program 46 times [2018-12-03 16:47:37,913 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:37,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:37,913 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:37,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:37,914 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:37,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:39,013 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 300 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:39,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:39,013 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:39,014 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:39,014 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:39,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:39,014 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:39,022 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:39,023 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:47:39,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:39,082 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:39,129 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 300 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:39,129 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:39,574 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 300 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:39,593 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:39,593 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 29 [2018-12-03 16:47:39,594 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:39,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-12-03 16:47:39,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-12-03 16:47:39,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=487, Unknown=0, NotChecked=0, Total=870 [2018-12-03 16:47:39,594 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand 30 states. [2018-12-03 16:47:40,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:40,072 INFO L93 Difference]: Finished difference Result 84 states and 85 transitions. [2018-12-03 16:47:40,072 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 16:47:40,073 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 75 [2018-12-03 16:47:40,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:40,073 INFO L225 Difference]: With dead ends: 84 [2018-12-03 16:47:40,074 INFO L226 Difference]: Without dead ends: 82 [2018-12-03 16:47:40,074 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 123 SyntacticMatches, 48 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1274 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1109, Invalid=1861, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 16:47:40,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-12-03 16:47:40,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 78. [2018-12-03 16:47:40,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-12-03 16:47:40,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-12-03 16:47:40,091 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 75 [2018-12-03 16:47:40,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:40,092 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-12-03 16:47:40,092 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-12-03 16:47:40,092 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-12-03 16:47:40,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-12-03 16:47:40,092 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:40,092 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1] [2018-12-03 16:47:40,092 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:40,092 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:40,093 INFO L82 PathProgramCache]: Analyzing trace with hash -1383305147, now seen corresponding path program 47 times [2018-12-03 16:47:40,093 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:40,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:40,093 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:40,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:40,093 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:40,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:41,140 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 600 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:41,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:41,140 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:41,140 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:41,141 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:41,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:41,141 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:41,150 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:47:41,150 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:47:41,230 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-12-03 16:47:41,230 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:41,233 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:42,251 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 600 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:42,251 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:42,945 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 600 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:42,965 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:42,966 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 76 [2018-12-03 16:47:42,966 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:42,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 16:47:42,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 16:47:42,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 16:47:42,967 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 77 states. [2018-12-03 16:47:44,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:44,361 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2018-12-03 16:47:44,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-12-03 16:47:44,362 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 77 [2018-12-03 16:47:44,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:44,362 INFO L225 Difference]: With dead ends: 132 [2018-12-03 16:47:44,362 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 16:47:44,363 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 79 SyntacticMatches, 49 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3552 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2401, Invalid=7901, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 16:47:44,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 16:47:44,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-12-03 16:47:44,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-12-03 16:47:44,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-12-03 16:47:44,377 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 77 [2018-12-03 16:47:44,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:44,378 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-12-03 16:47:44,378 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 16:47:44,378 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-12-03 16:47:44,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-12-03 16:47:44,378 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:44,378 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1] [2018-12-03 16:47:44,379 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:44,379 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:44,379 INFO L82 PathProgramCache]: Analyzing trace with hash -1587972498, now seen corresponding path program 48 times [2018-12-03 16:47:44,379 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:44,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:44,379 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:44,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:44,380 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:44,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:45,659 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:45,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:45,659 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:45,659 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:45,660 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:45,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:45,660 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:45,668 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:47:45,668 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:47:45,728 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:47:45,728 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:45,732 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:45,772 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:45,773 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:46,387 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:46,406 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:46,407 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 30 [2018-12-03 16:47:46,407 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:46,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-12-03 16:47:46,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-12-03 16:47:46,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=411, Invalid=519, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:47:46,408 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 31 states. [2018-12-03 16:47:47,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:47,185 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2018-12-03 16:47:47,186 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 16:47:47,186 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 78 [2018-12-03 16:47:47,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:47,186 INFO L225 Difference]: With dead ends: 87 [2018-12-03 16:47:47,186 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 16:47:47,187 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 128 SyntacticMatches, 50 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1377 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1192, Invalid=2000, Unknown=0, NotChecked=0, Total=3192 [2018-12-03 16:47:47,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 16:47:47,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 81. [2018-12-03 16:47:47,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-03 16:47:47,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2018-12-03 16:47:47,208 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 78 [2018-12-03 16:47:47,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:47,209 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2018-12-03 16:47:47,209 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-12-03 16:47:47,209 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2018-12-03 16:47:47,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-12-03 16:47:47,209 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:47,209 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1] [2018-12-03 16:47:47,210 INFO L423 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:47,210 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:47,210 INFO L82 PathProgramCache]: Analyzing trace with hash -1328247286, now seen corresponding path program 49 times [2018-12-03 16:47:47,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:47,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:47,210 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:47,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:47,211 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:47,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:48,473 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 650 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:48,473 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:48,473 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:48,473 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:48,473 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:48,473 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:48,474 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:48,482 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:48,482 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:47:48,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:48,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:49,636 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 650 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:49,637 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:50,515 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 650 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:50,535 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:50,535 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 79 [2018-12-03 16:47:50,536 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:50,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-03 16:47:50,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-03 16:47:50,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 16:47:50,537 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand 80 states. [2018-12-03 16:47:52,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:52,164 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2018-12-03 16:47:52,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 16:47:52,164 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 80 [2018-12-03 16:47:52,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:52,165 INFO L225 Difference]: With dead ends: 137 [2018-12-03 16:47:52,165 INFO L226 Difference]: Without dead ends: 82 [2018-12-03 16:47:52,166 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 82 SyntacticMatches, 51 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3850 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2588, Invalid=8542, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 16:47:52,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-12-03 16:47:52,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2018-12-03 16:47:52,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-12-03 16:47:52,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-12-03 16:47:52,184 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 80 [2018-12-03 16:47:52,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:52,185 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-12-03 16:47:52,185 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-03 16:47:52,185 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-12-03 16:47:52,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-12-03 16:47:52,185 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:52,185 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1] [2018-12-03 16:47:52,186 INFO L423 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:52,186 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:52,186 INFO L82 PathProgramCache]: Analyzing trace with hash 280259393, now seen corresponding path program 50 times [2018-12-03 16:47:52,186 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:52,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:52,187 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:52,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:52,187 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:52,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:52,691 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:52,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:52,692 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:52,692 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:52,692 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:52,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:52,692 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:52,710 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:47:52,710 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:47:52,864 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2018-12-03 16:47:52,864 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:52,869 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:52,894 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:52,894 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:53,419 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:53,439 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:53,439 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 31 [2018-12-03 16:47:53,439 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:53,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 16:47:53,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 16:47:53,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=440, Invalid=552, Unknown=0, NotChecked=0, Total=992 [2018-12-03 16:47:53,440 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 32 states. [2018-12-03 16:47:54,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:54,173 INFO L93 Difference]: Finished difference Result 90 states and 91 transitions. [2018-12-03 16:47:54,173 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 16:47:54,174 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 81 [2018-12-03 16:47:54,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:54,175 INFO L225 Difference]: With dead ends: 90 [2018-12-03 16:47:54,175 INFO L226 Difference]: Without dead ends: 88 [2018-12-03 16:47:54,175 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 133 SyntacticMatches, 52 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1484 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1278, Invalid=2144, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 16:47:54,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-12-03 16:47:54,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2018-12-03 16:47:54,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-12-03 16:47:54,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2018-12-03 16:47:54,197 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 81 [2018-12-03 16:47:54,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:54,197 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2018-12-03 16:47:54,197 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 16:47:54,198 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2018-12-03 16:47:54,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-12-03 16:47:54,198 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:54,198 INFO L402 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1] [2018-12-03 16:47:54,198 INFO L423 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:54,199 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:54,199 INFO L82 PathProgramCache]: Analyzing trace with hash -1253729763, now seen corresponding path program 51 times [2018-12-03 16:47:54,199 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:54,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:54,200 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:54,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:54,200 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:54,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:55,173 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 702 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:55,173 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:55,174 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:55,174 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:55,174 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:55,174 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:55,174 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:55,186 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:47:55,186 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:47:55,250 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:47:55,250 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:55,254 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:56,766 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 702 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:56,766 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:57,626 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 702 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:57,646 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:57,646 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 82 [2018-12-03 16:47:57,646 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:57,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 16:47:57,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 16:47:57,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1594, Invalid=5212, Unknown=0, NotChecked=0, Total=6806 [2018-12-03 16:47:57,647 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand 83 states. [2018-12-03 16:47:59,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:59,300 INFO L93 Difference]: Finished difference Result 142 states and 144 transitions. [2018-12-03 16:47:59,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-12-03 16:47:59,300 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 83 [2018-12-03 16:47:59,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:59,301 INFO L225 Difference]: With dead ends: 142 [2018-12-03 16:47:59,301 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 16:47:59,302 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 85 SyntacticMatches, 53 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4160 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2782, Invalid=9208, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 16:47:59,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 16:47:59,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2018-12-03 16:47:59,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-12-03 16:47:59,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2018-12-03 16:47:59,319 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 83 [2018-12-03 16:47:59,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:59,319 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2018-12-03 16:47:59,319 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 16:47:59,319 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2018-12-03 16:47:59,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-12-03 16:47:59,320 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:59,320 INFO L402 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1] [2018-12-03 16:47:59,320 INFO L423 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:59,320 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:59,320 INFO L82 PathProgramCache]: Analyzing trace with hash -1181377146, now seen corresponding path program 52 times [2018-12-03 16:47:59,320 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:59,321 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:59,321 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:59,321 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:59,321 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:59,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:59,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 378 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:47:59,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:59,788 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:59,788 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:59,788 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:59,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:59,788 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:47:59,796 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:59,796 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:47:59,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:59,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:00,027 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 378 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:00,027 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:00,824 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 378 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:00,843 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:00,843 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 32 [2018-12-03 16:48:00,843 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:00,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-12-03 16:48:00,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-12-03 16:48:00,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=586, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 16:48:00,844 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand 33 states. [2018-12-03 16:48:01,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:01,910 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2018-12-03 16:48:01,910 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 16:48:01,910 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 84 [2018-12-03 16:48:01,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:01,911 INFO L225 Difference]: With dead ends: 93 [2018-12-03 16:48:01,911 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 16:48:01,912 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 138 SyntacticMatches, 54 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1595 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1367, Invalid=2293, Unknown=0, NotChecked=0, Total=3660 [2018-12-03 16:48:01,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 16:48:01,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 87. [2018-12-03 16:48:01,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 16:48:01,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-12-03 16:48:01,931 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 84 [2018-12-03 16:48:01,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:01,931 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-12-03 16:48:01,931 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-12-03 16:48:01,932 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-12-03 16:48:01,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 16:48:01,932 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:01,932 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1] [2018-12-03 16:48:01,932 INFO L423 AbstractCegarLoop]: === Iteration 55 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:01,932 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:01,932 INFO L82 PathProgramCache]: Analyzing trace with hash -1432137950, now seen corresponding path program 53 times [2018-12-03 16:48:01,932 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:01,933 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:01,933 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:01,933 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:01,933 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:01,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:03,023 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 756 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:03,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:03,023 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:03,023 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:03,023 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:03,024 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:03,024 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:03,033 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:48:03,033 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:48:03,128 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-12-03 16:48:03,129 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:03,132 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:04,368 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 756 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:04,368 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:05,259 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 756 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:05,278 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:05,279 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 85 [2018-12-03 16:48:05,279 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:05,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-03 16:48:05,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-03 16:48:05,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 16:48:05,280 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 86 states. [2018-12-03 16:48:07,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:07,294 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-12-03 16:48:07,294 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-12-03 16:48:07,294 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 86 [2018-12-03 16:48:07,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:07,295 INFO L225 Difference]: With dead ends: 147 [2018-12-03 16:48:07,295 INFO L226 Difference]: Without dead ends: 88 [2018-12-03 16:48:07,296 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 88 SyntacticMatches, 55 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4482 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2983, Invalid=9899, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 16:48:07,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-12-03 16:48:07,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-12-03 16:48:07,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-12-03 16:48:07,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2018-12-03 16:48:07,316 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 86 [2018-12-03 16:48:07,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:07,317 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2018-12-03 16:48:07,317 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-03 16:48:07,317 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2018-12-03 16:48:07,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-12-03 16:48:07,317 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:07,318 INFO L402 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1] [2018-12-03 16:48:07,318 INFO L423 AbstractCegarLoop]: === Iteration 56 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:07,318 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:07,318 INFO L82 PathProgramCache]: Analyzing trace with hash -2048907495, now seen corresponding path program 54 times [2018-12-03 16:48:07,318 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:07,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:07,319 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:07,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:07,319 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:07,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:07,895 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 406 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:07,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:07,895 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:07,895 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:07,896 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:07,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:07,896 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:07,906 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:48:07,906 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:48:07,967 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:48:07,968 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:07,971 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:08,022 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 406 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:08,022 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:08,630 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 406 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:08,649 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:08,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 33 [2018-12-03 16:48:08,650 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:08,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-12-03 16:48:08,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-12-03 16:48:08,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=621, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 16:48:08,651 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand 34 states. [2018-12-03 16:48:09,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:09,269 INFO L93 Difference]: Finished difference Result 96 states and 97 transitions. [2018-12-03 16:48:09,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-12-03 16:48:09,269 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 87 [2018-12-03 16:48:09,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:09,270 INFO L225 Difference]: With dead ends: 96 [2018-12-03 16:48:09,270 INFO L226 Difference]: Without dead ends: 94 [2018-12-03 16:48:09,270 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 143 SyntacticMatches, 56 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1710 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1459, Invalid=2447, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 16:48:09,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-03 16:48:09,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 90. [2018-12-03 16:48:09,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-12-03 16:48:09,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2018-12-03 16:48:09,295 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 87 [2018-12-03 16:48:09,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:09,295 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2018-12-03 16:48:09,295 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-12-03 16:48:09,295 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2018-12-03 16:48:09,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-12-03 16:48:09,296 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:09,296 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1] [2018-12-03 16:48:09,296 INFO L423 AbstractCegarLoop]: === Iteration 57 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:09,296 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:09,297 INFO L82 PathProgramCache]: Analyzing trace with hash -1905147915, now seen corresponding path program 55 times [2018-12-03 16:48:09,297 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:09,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:09,297 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:09,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:09,298 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:09,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:10,468 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 812 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:10,469 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:10,469 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:10,469 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:10,469 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:10,469 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:10,469 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:10,479 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:10,479 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:48:10,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:10,550 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:12,189 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 812 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:12,189 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:13,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 812 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:13,168 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:13,168 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 88 [2018-12-03 16:48:13,168 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:13,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 16:48:13,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 16:48:13,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 16:48:13,169 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand 89 states. [2018-12-03 16:48:15,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:15,145 INFO L93 Difference]: Finished difference Result 152 states and 154 transitions. [2018-12-03 16:48:15,145 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-12-03 16:48:15,145 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 89 [2018-12-03 16:48:15,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:15,146 INFO L225 Difference]: With dead ends: 152 [2018-12-03 16:48:15,146 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 16:48:15,148 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 91 SyntacticMatches, 57 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4816 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=3191, Invalid=10615, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 16:48:15,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 16:48:15,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-12-03 16:48:15,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-12-03 16:48:15,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2018-12-03 16:48:15,176 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 89 [2018-12-03 16:48:15,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:15,176 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2018-12-03 16:48:15,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 16:48:15,176 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2018-12-03 16:48:15,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-12-03 16:48:15,177 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:15,177 INFO L402 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1] [2018-12-03 16:48:15,177 INFO L423 AbstractCegarLoop]: === Iteration 58 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:15,178 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:15,178 INFO L82 PathProgramCache]: Analyzing trace with hash 2078396574, now seen corresponding path program 56 times [2018-12-03 16:48:15,178 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:15,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:15,179 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:15,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:15,179 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:15,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:16,222 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:16,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:16,223 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:16,223 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:16,223 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:16,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:16,223 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 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:16,233 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:48:16,233 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:48:16,345 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-12-03 16:48:16,346 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:16,349 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:16,409 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:16,409 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:17,228 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:17,249 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:17,249 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 34 [2018-12-03 16:48:17,249 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:17,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 16:48:17,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 16:48:17,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=533, Invalid=657, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 16:48:17,250 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand 35 states. [2018-12-03 16:48:17,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:17,867 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-12-03 16:48:17,867 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 16:48:17,867 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 90 [2018-12-03 16:48:17,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:17,868 INFO L225 Difference]: With dead ends: 99 [2018-12-03 16:48:17,869 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 16:48:17,869 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 148 SyntacticMatches, 58 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1829 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1554, Invalid=2606, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 16:48:17,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 16:48:17,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 93. [2018-12-03 16:48:17,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-03 16:48:17,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2018-12-03 16:48:17,894 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 90 [2018-12-03 16:48:17,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:17,894 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2018-12-03 16:48:17,894 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 16:48:17,894 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2018-12-03 16:48:17,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-12-03 16:48:17,895 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:17,895 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1] [2018-12-03 16:48:17,895 INFO L423 AbstractCegarLoop]: === Iteration 59 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:17,895 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:17,896 INFO L82 PathProgramCache]: Analyzing trace with hash 179248186, now seen corresponding path program 57 times [2018-12-03 16:48:17,896 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:17,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:17,896 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:17,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:17,897 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:17,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:19,207 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 870 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:19,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:19,207 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:19,207 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:19,207 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:19,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:19,208 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:19,216 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:48:19,216 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:48:19,291 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:48:19,291 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:19,295 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:20,687 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 870 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:20,687 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:22,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 870 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:22,037 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:22,037 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 91 [2018-12-03 16:48:22,037 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:22,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-03 16:48:22,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-03 16:48:22,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 16:48:22,039 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand 92 states. [2018-12-03 16:48:24,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:24,067 INFO L93 Difference]: Finished difference Result 157 states and 159 transitions. [2018-12-03 16:48:24,067 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-03 16:48:24,067 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 92 [2018-12-03 16:48:24,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:24,067 INFO L225 Difference]: With dead ends: 157 [2018-12-03 16:48:24,068 INFO L226 Difference]: Without dead ends: 94 [2018-12-03 16:48:24,068 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 94 SyntacticMatches, 59 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5162 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3406, Invalid=11356, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 16:48:24,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-03 16:48:24,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2018-12-03 16:48:24,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-12-03 16:48:24,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-12-03 16:48:24,089 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 92 [2018-12-03 16:48:24,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:24,089 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-12-03 16:48:24,089 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-03 16:48:24,089 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-12-03 16:48:24,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-12-03 16:48:24,090 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:24,090 INFO L402 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1] [2018-12-03 16:48:24,090 INFO L423 AbstractCegarLoop]: === Iteration 60 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:24,090 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:24,090 INFO L82 PathProgramCache]: Analyzing trace with hash -288235791, now seen corresponding path program 58 times [2018-12-03 16:48:24,090 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:24,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:24,091 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:24,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:24,091 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:24,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:24,592 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 465 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:24,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:24,593 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:24,593 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:24,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:24,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:24,593 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 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:24,603 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:24,604 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:48:24,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:24,678 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:24,711 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 465 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:24,711 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:25,413 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 465 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:25,432 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:25,433 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 35 [2018-12-03 16:48:25,433 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:25,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-12-03 16:48:25,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-12-03 16:48:25,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=566, Invalid=694, Unknown=0, NotChecked=0, Total=1260 [2018-12-03 16:48:25,434 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 36 states. [2018-12-03 16:48:26,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:26,092 INFO L93 Difference]: Finished difference Result 102 states and 103 transitions. [2018-12-03 16:48:26,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 16:48:26,092 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 93 [2018-12-03 16:48:26,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:26,093 INFO L225 Difference]: With dead ends: 102 [2018-12-03 16:48:26,093 INFO L226 Difference]: Without dead ends: 100 [2018-12-03 16:48:26,094 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 153 SyntacticMatches, 60 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1952 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1652, Invalid=2770, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 16:48:26,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-12-03 16:48:26,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 96. [2018-12-03 16:48:26,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-12-03 16:48:26,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2018-12-03 16:48:26,117 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 93 [2018-12-03 16:48:26,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:26,117 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2018-12-03 16:48:26,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-12-03 16:48:26,118 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2018-12-03 16:48:26,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-12-03 16:48:26,118 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:26,118 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1] [2018-12-03 16:48:26,118 INFO L423 AbstractCegarLoop]: === Iteration 61 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:26,118 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:26,119 INFO L82 PathProgramCache]: Analyzing trace with hash -2116754995, now seen corresponding path program 59 times [2018-12-03 16:48:26,119 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:26,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:26,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:26,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:26,120 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:26,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:27,653 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 930 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:27,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:27,654 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:27,654 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:27,654 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:27,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:27,654 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:27,663 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:48:27,663 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:48:27,772 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2018-12-03 16:48:27,772 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:27,776 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:30,050 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 930 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:30,050 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:31,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 930 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:31,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:31,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 94 [2018-12-03 16:48:31,155 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:31,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 16:48:31,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 16:48:31,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 16:48:31,157 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand 95 states. [2018-12-03 16:48:32,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:32,693 INFO L93 Difference]: Finished difference Result 162 states and 164 transitions. [2018-12-03 16:48:32,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-12-03 16:48:32,693 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 95 [2018-12-03 16:48:32,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:32,693 INFO L225 Difference]: With dead ends: 162 [2018-12-03 16:48:32,694 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 16:48:32,695 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 97 SyntacticMatches, 61 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5520 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=3628, Invalid=12122, Unknown=0, NotChecked=0, Total=15750 [2018-12-03 16:48:32,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 16:48:32,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-12-03 16:48:32,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-12-03 16:48:32,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-12-03 16:48:32,720 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 95 [2018-12-03 16:48:32,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:32,720 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-12-03 16:48:32,721 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 16:48:32,721 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-12-03 16:48:32,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-12-03 16:48:32,721 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:32,721 INFO L402 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1] [2018-12-03 16:48:32,721 INFO L423 AbstractCegarLoop]: === Iteration 62 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:32,721 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:32,722 INFO L82 PathProgramCache]: Analyzing trace with hash -352972874, now seen corresponding path program 60 times [2018-12-03 16:48:32,722 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:32,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:32,722 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:32,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:32,722 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:32,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:33,479 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 496 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:33,479 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:33,480 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:33,480 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:33,480 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:33,480 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:33,480 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:33,489 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:48:33,489 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:48:33,562 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:48:33,562 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:33,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:33,636 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 496 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:33,637 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:34,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 496 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:34,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:34,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 36 [2018-12-03 16:48:34,371 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:34,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-12-03 16:48:34,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-12-03 16:48:34,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=600, Invalid=732, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 16:48:34,372 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 37 states. [2018-12-03 16:48:35,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:35,015 INFO L93 Difference]: Finished difference Result 105 states and 106 transitions. [2018-12-03 16:48:35,016 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 16:48:35,016 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 96 [2018-12-03 16:48:35,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:35,016 INFO L225 Difference]: With dead ends: 105 [2018-12-03 16:48:35,016 INFO L226 Difference]: Without dead ends: 103 [2018-12-03 16:48:35,017 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 158 SyntacticMatches, 62 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2079 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1753, Invalid=2939, Unknown=0, NotChecked=0, Total=4692 [2018-12-03 16:48:35,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-03 16:48:35,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 99. [2018-12-03 16:48:35,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-12-03 16:48:35,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2018-12-03 16:48:35,040 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 96 [2018-12-03 16:48:35,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:35,041 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2018-12-03 16:48:35,041 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-12-03 16:48:35,041 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2018-12-03 16:48:35,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-12-03 16:48:35,041 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:35,041 INFO L402 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1] [2018-12-03 16:48:35,041 INFO L423 AbstractCegarLoop]: === Iteration 63 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:35,042 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:35,042 INFO L82 PathProgramCache]: Analyzing trace with hash 95417682, now seen corresponding path program 61 times [2018-12-03 16:48:35,042 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:35,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:35,042 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:35,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:35,043 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:35,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:36,349 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 992 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:36,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:36,349 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:36,349 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:36,349 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:36,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:36,349 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:36,358 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:36,358 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:48:36,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:36,432 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:38,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 992 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:38,346 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:39,684 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 992 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:39,703 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:39,703 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 97 [2018-12-03 16:48:39,703 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:39,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2018-12-03 16:48:39,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2018-12-03 16:48:39,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2209, Invalid=7297, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 16:48:39,705 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand 98 states. [2018-12-03 16:48:41,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:41,161 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2018-12-03 16:48:41,161 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-12-03 16:48:41,162 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 98 [2018-12-03 16:48:41,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:41,163 INFO L225 Difference]: With dead ends: 167 [2018-12-03 16:48:41,163 INFO L226 Difference]: Without dead ends: 100 [2018-12-03 16:48:41,164 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 100 SyntacticMatches, 63 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5890 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=3857, Invalid=12913, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 16:48:41,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-12-03 16:48:41,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2018-12-03 16:48:41,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-12-03 16:48:41,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2018-12-03 16:48:41,188 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 98 [2018-12-03 16:48:41,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:41,188 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2018-12-03 16:48:41,188 INFO L481 AbstractCegarLoop]: Interpolant automaton has 98 states. [2018-12-03 16:48:41,188 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2018-12-03 16:48:41,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-12-03 16:48:41,189 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:41,189 INFO L402 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1] [2018-12-03 16:48:41,189 INFO L423 AbstractCegarLoop]: === Iteration 64 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:41,189 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:41,189 INFO L82 PathProgramCache]: Analyzing trace with hash 298685129, now seen corresponding path program 62 times [2018-12-03 16:48:41,190 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:41,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:41,190 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:41,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:41,191 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:41,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:42,048 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 528 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:42,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:42,049 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:42,049 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:42,049 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:42,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:42,049 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 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:42,061 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:48:42,061 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:48:42,392 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-12-03 16:48:42,392 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:42,397 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:42,466 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 528 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:42,466 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:43,244 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 528 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:43,263 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:43,263 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 37 [2018-12-03 16:48:43,263 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:43,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 16:48:43,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 16:48:43,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=635, Invalid=771, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 16:48:43,264 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 38 states. [2018-12-03 16:48:43,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:43,979 INFO L93 Difference]: Finished difference Result 108 states and 109 transitions. [2018-12-03 16:48:43,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 16:48:43,979 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 99 [2018-12-03 16:48:43,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:43,980 INFO L225 Difference]: With dead ends: 108 [2018-12-03 16:48:43,980 INFO L226 Difference]: Without dead ends: 106 [2018-12-03 16:48:43,981 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 163 SyntacticMatches, 64 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2210 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1857, Invalid=3113, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 16:48:43,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-12-03 16:48:44,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 102. [2018-12-03 16:48:44,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-12-03 16:48:44,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2018-12-03 16:48:44,010 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 99 [2018-12-03 16:48:44,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:44,010 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2018-12-03 16:48:44,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 16:48:44,011 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2018-12-03 16:48:44,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-12-03 16:48:44,011 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:44,011 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1] [2018-12-03 16:48:44,012 INFO L423 AbstractCegarLoop]: === Iteration 65 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:44,012 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:44,012 INFO L82 PathProgramCache]: Analyzing trace with hash -726466651, now seen corresponding path program 63 times [2018-12-03 16:48:44,012 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:44,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:44,013 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:44,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:44,013 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:44,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:45,366 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 1056 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:45,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:45,367 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:45,367 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:45,367 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:45,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:45,367 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:45,383 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:48:45,383 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:48:45,460 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:48:45,460 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:45,464 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:47,508 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 1056 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:47,508 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:48,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 1056 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:48,779 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:48,779 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 100 [2018-12-03 16:48:48,779 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:48,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 16:48:48,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 16:48:48,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 16:48:48,780 INFO L87 Difference]: Start difference. First operand 102 states and 103 transitions. Second operand 101 states. [2018-12-03 16:48:51,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:51,187 INFO L93 Difference]: Finished difference Result 172 states and 174 transitions. [2018-12-03 16:48:51,187 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-12-03 16:48:51,187 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 101 [2018-12-03 16:48:51,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:51,188 INFO L225 Difference]: With dead ends: 172 [2018-12-03 16:48:51,188 INFO L226 Difference]: Without dead ends: 103 [2018-12-03 16:48:51,189 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 103 SyntacticMatches, 65 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6272 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 16:48:51,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-03 16:48:51,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2018-12-03 16:48:51,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2018-12-03 16:48:51,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2018-12-03 16:48:51,213 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 101 [2018-12-03 16:48:51,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:51,214 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2018-12-03 16:48:51,214 INFO L481 AbstractCegarLoop]: Interpolant automaton has 101 states. [2018-12-03 16:48:51,214 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2018-12-03 16:48:51,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-12-03 16:48:51,214 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:51,214 INFO L402 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1] [2018-12-03 16:48:51,214 INFO L423 AbstractCegarLoop]: === Iteration 66 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:51,215 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:51,215 INFO L82 PathProgramCache]: Analyzing trace with hash -1089840434, now seen corresponding path program 64 times [2018-12-03 16:48:51,215 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:51,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:51,215 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:51,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:51,215 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:51,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:51,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:51,767 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:51,767 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:51,767 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:51,767 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:51,767 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:51,767 INFO 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 16:48:51,775 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:51,775 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:48:51,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:51,851 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:51,883 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:51,884 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:52,878 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:52,897 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:52,897 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 38 [2018-12-03 16:48:52,897 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:52,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-12-03 16:48:52,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-12-03 16:48:52,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=671, Invalid=811, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 16:48:52,898 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand 39 states. [2018-12-03 16:48:53,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:53,620 INFO L93 Difference]: Finished difference Result 111 states and 112 transitions. [2018-12-03 16:48:53,620 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 16:48:53,620 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 102 [2018-12-03 16:48:53,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:53,621 INFO L225 Difference]: With dead ends: 111 [2018-12-03 16:48:53,621 INFO L226 Difference]: Without dead ends: 109 [2018-12-03 16:48:53,621 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 168 SyntacticMatches, 66 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2345 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1964, Invalid=3292, Unknown=0, NotChecked=0, Total=5256 [2018-12-03 16:48:53,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-12-03 16:48:53,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 105. [2018-12-03 16:48:53,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-12-03 16:48:53,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 106 transitions. [2018-12-03 16:48:53,651 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 106 transitions. Word has length 102 [2018-12-03 16:48:53,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:53,651 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 106 transitions. [2018-12-03 16:48:53,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-12-03 16:48:53,652 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 106 transitions. [2018-12-03 16:48:53,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-12-03 16:48:53,652 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:53,652 INFO L402 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1] [2018-12-03 16:48:53,652 INFO L423 AbstractCegarLoop]: === Iteration 67 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:53,652 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:53,652 INFO L82 PathProgramCache]: Analyzing trace with hash 635296362, now seen corresponding path program 65 times [2018-12-03 16:48:53,653 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:53,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:53,653 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:53,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:53,653 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:53,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:55,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 1122 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:55,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:55,135 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:55,135 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:55,136 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:55,136 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:55,136 INFO 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 16:48:55,144 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:48:55,144 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:48:55,271 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-12-03 16:48:55,272 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:55,275 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:57,400 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 1122 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:57,400 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:58,718 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 1122 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:58,737 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:58,737 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 103 [2018-12-03 16:48:58,737 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:58,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2018-12-03 16:48:58,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2018-12-03 16:48:58,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2483, Invalid=8229, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 16:48:58,739 INFO L87 Difference]: Start difference. First operand 105 states and 106 transitions. Second operand 104 states. [2018-12-03 16:49:01,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:01,225 INFO L93 Difference]: Finished difference Result 177 states and 179 transitions. [2018-12-03 16:49:01,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-12-03 16:49:01,225 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 104 [2018-12-03 16:49:01,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:01,226 INFO L225 Difference]: With dead ends: 177 [2018-12-03 16:49:01,226 INFO L226 Difference]: Without dead ends: 106 [2018-12-03 16:49:01,227 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 106 SyntacticMatches, 67 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6666 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=4336, Invalid=14570, Unknown=0, NotChecked=0, Total=18906 [2018-12-03 16:49:01,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-12-03 16:49:01,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-12-03 16:49:01,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-12-03 16:49:01,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2018-12-03 16:49:01,262 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 104 [2018-12-03 16:49:01,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:01,262 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2018-12-03 16:49:01,262 INFO L481 AbstractCegarLoop]: Interpolant automaton has 104 states. [2018-12-03 16:49:01,262 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2018-12-03 16:49:01,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-12-03 16:49:01,263 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:01,263 INFO L402 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1] [2018-12-03 16:49:01,263 INFO L423 AbstractCegarLoop]: === Iteration 68 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:01,263 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:01,263 INFO L82 PathProgramCache]: Analyzing trace with hash -1315487071, now seen corresponding path program 66 times [2018-12-03 16:49:01,263 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:01,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:01,264 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:01,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:01,264 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:01,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:01,859 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 595 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:01,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:01,859 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:01,859 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:01,859 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:01,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:01,859 INFO 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 16:49:01,867 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:49:01,867 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:49:01,951 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:49:01,951 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:01,956 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:02,010 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 595 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:02,010 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:03,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 595 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:03,237 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:03,237 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 39 [2018-12-03 16:49:03,237 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:03,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-12-03 16:49:03,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-12-03 16:49:03,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=708, Invalid=852, Unknown=0, NotChecked=0, Total=1560 [2018-12-03 16:49:03,238 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand 40 states. [2018-12-03 16:49:04,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:04,003 INFO L93 Difference]: Finished difference Result 114 states and 115 transitions. [2018-12-03 16:49:04,003 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 16:49:04,004 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 105 [2018-12-03 16:49:04,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:04,004 INFO L225 Difference]: With dead ends: 114 [2018-12-03 16:49:04,004 INFO L226 Difference]: Without dead ends: 112 [2018-12-03 16:49:04,005 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 173 SyntacticMatches, 68 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2484 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2074, Invalid=3476, Unknown=0, NotChecked=0, Total=5550 [2018-12-03 16:49:04,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-12-03 16:49:04,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 108. [2018-12-03 16:49:04,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-12-03 16:49:04,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2018-12-03 16:49:04,032 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 105 [2018-12-03 16:49:04,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:04,032 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2018-12-03 16:49:04,033 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-12-03 16:49:04,033 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2018-12-03 16:49:04,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-12-03 16:49:04,033 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:04,033 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1] [2018-12-03 16:49:04,033 INFO L423 AbstractCegarLoop]: === Iteration 69 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:04,033 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:04,034 INFO L82 PathProgramCache]: Analyzing trace with hash -1462756995, now seen corresponding path program 67 times [2018-12-03 16:49:04,034 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:04,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:04,034 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:04,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:04,034 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:04,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:05,685 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 1190 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:05,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:05,685 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:05,685 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:05,685 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:05,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:05,685 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 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 16:49:05,693 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:05,693 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:49:05,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:05,772 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:07,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 1190 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:07,886 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:09,265 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 1190 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:09,284 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:09,284 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 106 [2018-12-03 16:49:09,284 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:09,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-03 16:49:09,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-03 16:49:09,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 16:49:09,286 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 107 states. [2018-12-03 16:49:11,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:11,926 INFO L93 Difference]: Finished difference Result 182 states and 184 transitions. [2018-12-03 16:49:11,926 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-03 16:49:11,927 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 107 [2018-12-03 16:49:11,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:11,927 INFO L225 Difference]: With dead ends: 182 [2018-12-03 16:49:11,927 INFO L226 Difference]: Without dead ends: 109 [2018-12-03 16:49:11,928 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 109 SyntacticMatches, 69 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7072 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=4586, Invalid=15436, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 16:49:11,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-12-03 16:49:11,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2018-12-03 16:49:11,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-12-03 16:49:11,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2018-12-03 16:49:11,955 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 107 [2018-12-03 16:49:11,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:11,955 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2018-12-03 16:49:11,955 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-03 16:49:11,955 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2018-12-03 16:49:11,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2018-12-03 16:49:11,956 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:11,956 INFO L402 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1] [2018-12-03 16:49:11,956 INFO L423 AbstractCegarLoop]: === Iteration 70 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:11,956 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:11,956 INFO L82 PathProgramCache]: Analyzing trace with hash -2049527322, now seen corresponding path program 68 times [2018-12-03 16:49:11,956 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:11,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:11,957 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:11,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:11,957 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:11,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:12,902 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 630 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:12,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:12,902 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:12,902 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:12,902 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:12,903 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:12,903 INFO 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 16:49:12,911 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:49:12,911 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:49:13,050 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2018-12-03 16:49:13,050 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:13,054 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:13,106 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 630 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:13,106 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:14,030 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 630 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:14,050 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:14,051 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 40 [2018-12-03 16:49:14,051 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:14,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 16:49:14,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 16:49:14,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=746, Invalid=894, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 16:49:14,051 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 41 states. [2018-12-03 16:49:14,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:14,857 INFO L93 Difference]: Finished difference Result 117 states and 118 transitions. [2018-12-03 16:49:14,857 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 16:49:14,857 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 108 [2018-12-03 16:49:14,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:14,858 INFO L225 Difference]: With dead ends: 117 [2018-12-03 16:49:14,858 INFO L226 Difference]: Without dead ends: 115 [2018-12-03 16:49:14,859 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 178 SyntacticMatches, 70 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2627 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2187, Invalid=3665, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 16:49:14,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-12-03 16:49:14,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 111. [2018-12-03 16:49:14,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-12-03 16:49:14,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 112 transitions. [2018-12-03 16:49:14,887 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 112 transitions. Word has length 108 [2018-12-03 16:49:14,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:14,888 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 112 transitions. [2018-12-03 16:49:14,888 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 16:49:14,888 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 112 transitions. [2018-12-03 16:49:14,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-12-03 16:49:14,888 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:14,888 INFO L402 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1] [2018-12-03 16:49:14,888 INFO L423 AbstractCegarLoop]: === Iteration 71 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:14,889 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:14,889 INFO L82 PathProgramCache]: Analyzing trace with hash 1794165634, now seen corresponding path program 69 times [2018-12-03 16:49:14,889 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:14,889 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:14,889 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:14,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:14,890 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:14,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:16,518 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 1260 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:16,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:16,519 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:16,519 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:16,519 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:16,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:16,519 INFO 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 16:49:16,527 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:49:16,527 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:49:16,614 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:49:16,614 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:16,618 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:18,832 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 1260 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:18,832 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:20,289 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 1260 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:20,308 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:20,308 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 109 [2018-12-03 16:49:20,308 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:20,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2018-12-03 16:49:20,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2018-12-03 16:49:20,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2773, Invalid=9217, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 16:49:20,309 INFO L87 Difference]: Start difference. First operand 111 states and 112 transitions. Second operand 110 states. [2018-12-03 16:49:23,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:23,343 INFO L93 Difference]: Finished difference Result 187 states and 189 transitions. [2018-12-03 16:49:23,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-12-03 16:49:23,343 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 110 [2018-12-03 16:49:23,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:23,344 INFO L225 Difference]: With dead ends: 187 [2018-12-03 16:49:23,344 INFO L226 Difference]: Without dead ends: 112 [2018-12-03 16:49:23,345 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 112 SyntacticMatches, 71 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7490 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=4843, Invalid=16327, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 16:49:23,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-12-03 16:49:23,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2018-12-03 16:49:23,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-12-03 16:49:23,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2018-12-03 16:49:23,375 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 110 [2018-12-03 16:49:23,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:23,375 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2018-12-03 16:49:23,375 INFO L481 AbstractCegarLoop]: Interpolant automaton has 110 states. [2018-12-03 16:49:23,375 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2018-12-03 16:49:23,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-12-03 16:49:23,376 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:23,376 INFO L402 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1] [2018-12-03 16:49:23,376 INFO L423 AbstractCegarLoop]: === Iteration 72 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:23,376 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:23,376 INFO L82 PathProgramCache]: Analyzing trace with hash 1836248697, now seen corresponding path program 70 times [2018-12-03 16:49:23,376 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:23,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:23,377 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:23,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:23,377 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:23,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:24,027 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 666 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:24,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:24,028 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:24,028 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:24,028 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:24,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:24,028 INFO 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 16:49:24,036 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:24,036 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:49:24,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:24,122 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:24,180 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 666 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:24,180 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:25,312 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 666 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:25,331 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:25,331 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 41 [2018-12-03 16:49:25,332 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:25,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-12-03 16:49:25,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-12-03 16:49:25,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=785, Invalid=937, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 16:49:25,333 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand 42 states. [2018-12-03 16:49:26,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:26,165 INFO L93 Difference]: Finished difference Result 120 states and 121 transitions. [2018-12-03 16:49:26,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 16:49:26,166 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 111 [2018-12-03 16:49:26,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:26,166 INFO L225 Difference]: With dead ends: 120 [2018-12-03 16:49:26,166 INFO L226 Difference]: Without dead ends: 118 [2018-12-03 16:49:26,167 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 183 SyntacticMatches, 72 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2774 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2303, Invalid=3859, Unknown=0, NotChecked=0, Total=6162 [2018-12-03 16:49:26,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-12-03 16:49:26,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 114. [2018-12-03 16:49:26,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-12-03 16:49:26,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2018-12-03 16:49:26,198 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 111 [2018-12-03 16:49:26,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:26,199 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2018-12-03 16:49:26,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-12-03 16:49:26,199 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2018-12-03 16:49:26,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-12-03 16:49:26,199 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:26,199 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1] [2018-12-03 16:49:26,199 INFO L423 AbstractCegarLoop]: === Iteration 73 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:26,200 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:26,200 INFO L82 PathProgramCache]: Analyzing trace with hash -596627627, now seen corresponding path program 71 times [2018-12-03 16:49:26,200 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:26,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:26,200 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:26,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:26,200 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:26,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:28,228 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 1332 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:28,229 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:28,229 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:28,229 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:28,229 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:28,229 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:28,229 INFO 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 16:49:28,237 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:49:28,237 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:49:28,375 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2018-12-03 16:49:28,376 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:28,380 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:30,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 1332 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:30,490 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:32,057 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 1332 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:32,076 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:32,076 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 112 [2018-12-03 16:49:32,076 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:32,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-12-03 16:49:32,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-12-03 16:49:32,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 16:49:32,078 INFO L87 Difference]: Start difference. First operand 114 states and 115 transitions. Second operand 113 states. [2018-12-03 16:49:35,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:35,288 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2018-12-03 16:49:35,288 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-03 16:49:35,288 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 113 [2018-12-03 16:49:35,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:35,288 INFO L225 Difference]: With dead ends: 192 [2018-12-03 16:49:35,288 INFO L226 Difference]: Without dead ends: 115 [2018-12-03 16:49:35,289 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 115 SyntacticMatches, 73 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7920 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=5107, Invalid=17243, Unknown=0, NotChecked=0, Total=22350 [2018-12-03 16:49:35,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-12-03 16:49:35,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2018-12-03 16:49:35,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-12-03 16:49:35,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2018-12-03 16:49:35,323 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 113 [2018-12-03 16:49:35,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:35,323 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2018-12-03 16:49:35,323 INFO L481 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-12-03 16:49:35,323 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2018-12-03 16:49:35,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-12-03 16:49:35,324 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:35,324 INFO L402 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1] [2018-12-03 16:49:35,324 INFO L423 AbstractCegarLoop]: === Iteration 74 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:35,324 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:35,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1030548226, now seen corresponding path program 72 times [2018-12-03 16:49:35,325 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:35,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:35,325 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:35,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:35,325 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:35,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:36,565 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 703 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:36,566 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:36,566 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:36,566 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:36,566 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:36,566 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:36,566 INFO 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 16:49:36,575 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:49:36,575 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:49:36,662 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:49:36,663 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:36,667 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:36,730 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 703 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:36,730 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:37,726 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 703 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:37,745 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:37,745 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 42 [2018-12-03 16:49:37,745 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:37,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-12-03 16:49:37,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-12-03 16:49:37,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=825, Invalid=981, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 16:49:37,746 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand 43 states. [2018-12-03 16:49:38,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:38,833 INFO L93 Difference]: Finished difference Result 123 states and 124 transitions. [2018-12-03 16:49:38,833 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-12-03 16:49:38,833 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 114 [2018-12-03 16:49:38,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:38,834 INFO L225 Difference]: With dead ends: 123 [2018-12-03 16:49:38,834 INFO L226 Difference]: Without dead ends: 121 [2018-12-03 16:49:38,835 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 188 SyntacticMatches, 74 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2925 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2422, Invalid=4058, Unknown=0, NotChecked=0, Total=6480 [2018-12-03 16:49:38,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-12-03 16:49:38,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 117. [2018-12-03 16:49:38,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-12-03 16:49:38,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 118 transitions. [2018-12-03 16:49:38,867 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 118 transitions. Word has length 114 [2018-12-03 16:49:38,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:38,867 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 118 transitions. [2018-12-03 16:49:38,867 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-12-03 16:49:38,867 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 118 transitions. [2018-12-03 16:49:38,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-12-03 16:49:38,868 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:38,868 INFO L402 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1] [2018-12-03 16:49:38,868 INFO L423 AbstractCegarLoop]: === Iteration 75 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:38,868 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:38,868 INFO L82 PathProgramCache]: Analyzing trace with hash 1780533402, now seen corresponding path program 73 times [2018-12-03 16:49:38,868 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:38,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:38,869 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:38,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:38,869 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:38,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:40,635 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 1406 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:40,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:40,635 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:40,635 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:40,635 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:40,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:40,635 INFO 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 16:49:40,644 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:40,644 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:49:40,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:40,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:42,962 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 1406 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:42,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:44,797 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 1406 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:44,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:44,817 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 115 [2018-12-03 16:49:44,817 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:44,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2018-12-03 16:49:44,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2018-12-03 16:49:44,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3079, Invalid=10261, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 16:49:44,818 INFO L87 Difference]: Start difference. First operand 117 states and 118 transitions. Second operand 116 states. [2018-12-03 16:49:47,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:47,957 INFO L93 Difference]: Finished difference Result 197 states and 199 transitions. [2018-12-03 16:49:47,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2018-12-03 16:49:47,957 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 116 [2018-12-03 16:49:47,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:47,958 INFO L225 Difference]: With dead ends: 197 [2018-12-03 16:49:47,958 INFO L226 Difference]: Without dead ends: 118 [2018-12-03 16:49:47,959 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 118 SyntacticMatches, 75 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8362 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=5378, Invalid=18184, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 16:49:47,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-12-03 16:49:47,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2018-12-03 16:49:47,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-12-03 16:49:47,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2018-12-03 16:49:47,996 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 116 [2018-12-03 16:49:47,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:47,996 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2018-12-03 16:49:47,996 INFO L481 AbstractCegarLoop]: Interpolant automaton has 116 states. [2018-12-03 16:49:47,996 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2018-12-03 16:49:47,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-12-03 16:49:47,996 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:47,996 INFO L402 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1] [2018-12-03 16:49:47,997 INFO L423 AbstractCegarLoop]: === Iteration 76 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:47,997 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:47,997 INFO L82 PathProgramCache]: Analyzing trace with hash -1591437743, now seen corresponding path program 74 times [2018-12-03 16:49:47,997 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:47,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:47,997 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:47,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:47,998 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:48,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:48,966 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 741 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:48,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:48,966 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:48,966 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:48,966 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:48,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:48,967 INFO 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 16:49:48,975 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:49:48,975 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:49:49,124 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-12-03 16:49:49,124 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:49,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:49,184 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 741 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:49,185 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:50,283 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 741 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:50,301 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:50,301 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 43 [2018-12-03 16:49:50,301 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:50,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 16:49:50,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 16:49:50,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=866, Invalid=1026, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 16:49:50,302 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand 44 states. [2018-12-03 16:49:51,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:51,198 INFO L93 Difference]: Finished difference Result 126 states and 127 transitions. [2018-12-03 16:49:51,198 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 16:49:51,198 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 117 [2018-12-03 16:49:51,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:51,199 INFO L225 Difference]: With dead ends: 126 [2018-12-03 16:49:51,199 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 16:49:51,199 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 193 SyntacticMatches, 76 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3080 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2544, Invalid=4262, Unknown=0, NotChecked=0, Total=6806 [2018-12-03 16:49:51,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 16:49:51,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 120. [2018-12-03 16:49:51,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-12-03 16:49:51,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2018-12-03 16:49:51,234 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 117 [2018-12-03 16:49:51,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:51,234 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2018-12-03 16:49:51,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 16:49:51,235 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2018-12-03 16:49:51,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-12-03 16:49:51,235 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:51,235 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1] [2018-12-03 16:49:51,236 INFO L423 AbstractCegarLoop]: === Iteration 77 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:51,236 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:51,236 INFO L82 PathProgramCache]: Analyzing trace with hash -363380435, now seen corresponding path program 75 times [2018-12-03 16:49:51,236 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:51,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:51,237 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:51,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:51,237 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:51,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:53,154 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 1482 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:53,154 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:53,154 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:53,154 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:53,154 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:53,154 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:53,154 INFO 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 16:49:53,163 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:49:53,163 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:49:53,257 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:49:53,257 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:53,264 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:55,793 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 1482 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:55,793 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:57,520 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 1482 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:57,540 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:57,540 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 118 [2018-12-03 16:49:57,540 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:57,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2018-12-03 16:49:57,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2018-12-03 16:49:57,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 16:49:57,541 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand 119 states. [2018-12-03 16:50:01,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:01,115 INFO L93 Difference]: Finished difference Result 202 states and 204 transitions. [2018-12-03 16:50:01,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-12-03 16:50:01,115 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 119 [2018-12-03 16:50:01,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:01,115 INFO L225 Difference]: With dead ends: 202 [2018-12-03 16:50:01,115 INFO L226 Difference]: Without dead ends: 121 [2018-12-03 16:50:01,116 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 121 SyntacticMatches, 77 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8816 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=5656, Invalid=19150, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 16:50:01,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-12-03 16:50:01,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2018-12-03 16:50:01,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2018-12-03 16:50:01,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 122 transitions. [2018-12-03 16:50:01,149 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 122 transitions. Word has length 119 [2018-12-03 16:50:01,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:01,149 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 122 transitions. [2018-12-03 16:50:01,149 INFO L481 AbstractCegarLoop]: Interpolant automaton has 119 states. [2018-12-03 16:50:01,150 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 122 transitions. [2018-12-03 16:50:01,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-12-03 16:50:01,150 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:01,150 INFO L402 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1] [2018-12-03 16:50:01,150 INFO L423 AbstractCegarLoop]: === Iteration 78 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:01,150 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:01,151 INFO L82 PathProgramCache]: Analyzing trace with hash 234325014, now seen corresponding path program 76 times [2018-12-03 16:50:01,151 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:01,151 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:01,151 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:50:01,151 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:01,151 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:01,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:01,969 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 780 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:01,969 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:01,969 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:01,969 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:01,969 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:01,969 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:01,969 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:50:01,977 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:50:01,977 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:50:02,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:02,072 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:02,125 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 780 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:02,126 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:03,229 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 780 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:03,247 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:03,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 44 [2018-12-03 16:50:03,248 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:03,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 16:50:03,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 16:50:03,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=908, Invalid=1072, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 16:50:03,248 INFO L87 Difference]: Start difference. First operand 121 states and 122 transitions. Second operand 45 states. [2018-12-03 16:50:04,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:04,430 INFO L93 Difference]: Finished difference Result 129 states and 130 transitions. [2018-12-03 16:50:04,430 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 16:50:04,430 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 120 [2018-12-03 16:50:04,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:04,431 INFO L225 Difference]: With dead ends: 129 [2018-12-03 16:50:04,431 INFO L226 Difference]: Without dead ends: 127 [2018-12-03 16:50:04,431 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 198 SyntacticMatches, 78 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3239 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2669, Invalid=4471, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 16:50:04,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-12-03 16:50:04,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 123. [2018-12-03 16:50:04,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-12-03 16:50:04,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 124 transitions. [2018-12-03 16:50:04,467 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 124 transitions. Word has length 120 [2018-12-03 16:50:04,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:04,467 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 124 transitions. [2018-12-03 16:50:04,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 16:50:04,467 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 124 transitions. [2018-12-03 16:50:04,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-12-03 16:50:04,467 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:04,468 INFO L402 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1] [2018-12-03 16:50:04,468 INFO L423 AbstractCegarLoop]: === Iteration 79 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:04,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:04,468 INFO L82 PathProgramCache]: Analyzing trace with hash 1847972274, now seen corresponding path program 77 times [2018-12-03 16:50:04,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:04,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:04,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:50:04,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:04,469 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:04,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:06,412 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 1560 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:06,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:06,413 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:06,413 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:06,413 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:06,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:06,413 INFO 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 16:50:06,421 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:50:06,422 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:50:06,576 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-12-03 16:50:06,577 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:50:06,581 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:09,336 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 1560 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:09,336 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:11,173 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 1560 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:11,193 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:11,193 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 121 [2018-12-03 16:50:11,193 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:11,194 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2018-12-03 16:50:11,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2018-12-03 16:50:11,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3401, Invalid=11361, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 16:50:11,195 INFO L87 Difference]: Start difference. First operand 123 states and 124 transitions. Second operand 122 states. [2018-12-03 16:50:14,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:14,886 INFO L93 Difference]: Finished difference Result 207 states and 209 transitions. [2018-12-03 16:50:14,887 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2018-12-03 16:50:14,887 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 122 [2018-12-03 16:50:14,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:14,887 INFO L225 Difference]: With dead ends: 207 [2018-12-03 16:50:14,887 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 16:50:14,889 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 124 SyntacticMatches, 79 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9282 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=5941, Invalid=20141, Unknown=0, NotChecked=0, Total=26082 [2018-12-03 16:50:14,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 16:50:14,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-12-03 16:50:14,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-12-03 16:50:14,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2018-12-03 16:50:14,924 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 122 [2018-12-03 16:50:14,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:14,924 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2018-12-03 16:50:14,924 INFO L481 AbstractCegarLoop]: Interpolant automaton has 122 states. [2018-12-03 16:50:14,924 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2018-12-03 16:50:14,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-12-03 16:50:14,924 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:14,924 INFO L402 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1] [2018-12-03 16:50:14,925 INFO L423 AbstractCegarLoop]: === Iteration 80 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:14,925 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:14,925 INFO L82 PathProgramCache]: Analyzing trace with hash 1156594217, now seen corresponding path program 78 times [2018-12-03 16:50:14,925 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:14,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:14,926 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:50:14,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:14,926 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:14,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:15,742 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 820 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:15,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:15,742 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:15,743 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:15,743 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:15,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:15,743 INFO 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 16:50:15,752 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:50:15,753 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:50:15,852 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:50:15,852 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:50:15,858 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:15,917 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 820 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:15,918 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:17,098 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 820 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:17,118 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:17,119 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 45 [2018-12-03 16:50:17,119 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:17,119 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-12-03 16:50:17,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-12-03 16:50:17,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=951, Invalid=1119, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 16:50:17,120 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand 46 states. [2018-12-03 16:50:18,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:18,114 INFO L93 Difference]: Finished difference Result 132 states and 133 transitions. [2018-12-03 16:50:18,114 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-12-03 16:50:18,114 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 123 [2018-12-03 16:50:18,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:18,115 INFO L225 Difference]: With dead ends: 132 [2018-12-03 16:50:18,115 INFO L226 Difference]: Without dead ends: 130 [2018-12-03 16:50:18,116 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 203 SyntacticMatches, 80 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3402 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2797, Invalid=4685, Unknown=0, NotChecked=0, Total=7482 [2018-12-03 16:50:18,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-12-03 16:50:18,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 126. [2018-12-03 16:50:18,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-12-03 16:50:18,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2018-12-03 16:50:18,168 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 123 [2018-12-03 16:50:18,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:18,168 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2018-12-03 16:50:18,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-12-03 16:50:18,168 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2018-12-03 16:50:18,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-12-03 16:50:18,169 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:18,169 INFO L402 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1] [2018-12-03 16:50:18,169 INFO L423 AbstractCegarLoop]: === Iteration 81 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:18,169 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:18,170 INFO L82 PathProgramCache]: Analyzing trace with hash -909553915, now seen corresponding path program 79 times [2018-12-03 16:50:18,170 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:18,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:18,170 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:50:18,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:18,171 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:18,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:20,671 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 1640 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:20,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:20,672 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:20,672 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:20,672 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:20,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:20,672 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 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 16:50:20,681 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:50:20,681 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:50:20,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:20,780 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:23,383 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 1640 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:23,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:25,607 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 1640 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:25,627 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:25,627 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 124 [2018-12-03 16:50:25,627 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:25,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 125 states [2018-12-03 16:50:25,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2018-12-03 16:50:25,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3568, Invalid=11932, Unknown=0, NotChecked=0, Total=15500 [2018-12-03 16:50:25,628 INFO L87 Difference]: Start difference. First operand 126 states and 127 transitions. Second operand 125 states. [2018-12-03 16:50:29,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:29,541 INFO L93 Difference]: Finished difference Result 212 states and 214 transitions. [2018-12-03 16:50:29,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-12-03 16:50:29,541 INFO L78 Accepts]: Start accepts. Automaton has 125 states. Word has length 125 [2018-12-03 16:50:29,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:29,542 INFO L225 Difference]: With dead ends: 212 [2018-12-03 16:50:29,542 INFO L226 Difference]: Without dead ends: 127 [2018-12-03 16:50:29,543 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 127 SyntacticMatches, 81 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9760 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=6233, Invalid=21157, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 16:50:29,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-12-03 16:50:29,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2018-12-03 16:50:29,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-12-03 16:50:29,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2018-12-03 16:50:29,588 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 125 [2018-12-03 16:50:29,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:29,589 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2018-12-03 16:50:29,589 INFO L481 AbstractCegarLoop]: Interpolant automaton has 125 states. [2018-12-03 16:50:29,589 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2018-12-03 16:50:29,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-12-03 16:50:29,590 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:29,590 INFO L402 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1] [2018-12-03 16:50:29,590 INFO L423 AbstractCegarLoop]: === Iteration 82 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:29,590 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:29,590 INFO L82 PathProgramCache]: Analyzing trace with hash 909901614, now seen corresponding path program 80 times [2018-12-03 16:50:29,591 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:29,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:29,591 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:50:29,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:29,591 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:29,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:30,430 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 861 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:30,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:30,431 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:30,431 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:30,431 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:30,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:30,431 INFO 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 16:50:30,441 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:50:30,441 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:50:30,617 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-12-03 16:50:30,617 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:50:30,621 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:30,661 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 861 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:30,661 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:31,950 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 861 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:31,969 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:31,970 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 44] total 46 [2018-12-03 16:50:31,970 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:31,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 16:50:31,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 16:50:31,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=995, Invalid=1167, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 16:50:31,971 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand 47 states. [2018-12-03 16:50:33,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:33,001 INFO L93 Difference]: Finished difference Result 135 states and 136 transitions. [2018-12-03 16:50:33,001 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 16:50:33,001 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 126 [2018-12-03 16:50:33,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:33,003 INFO L225 Difference]: With dead ends: 135 [2018-12-03 16:50:33,003 INFO L226 Difference]: Without dead ends: 133 [2018-12-03 16:50:33,004 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 208 SyntacticMatches, 82 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3569 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2928, Invalid=4904, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 16:50:33,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-12-03 16:50:33,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 129. [2018-12-03 16:50:33,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-12-03 16:50:33,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 130 transitions. [2018-12-03 16:50:33,045 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 130 transitions. Word has length 126 [2018-12-03 16:50:33,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:33,045 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 130 transitions. [2018-12-03 16:50:33,045 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 16:50:33,046 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 130 transitions. [2018-12-03 16:50:33,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-12-03 16:50:33,046 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:33,046 INFO L402 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1] [2018-12-03 16:50:33,046 INFO L423 AbstractCegarLoop]: === Iteration 83 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:33,047 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:33,047 INFO L82 PathProgramCache]: Analyzing trace with hash -1757944118, now seen corresponding path program 81 times [2018-12-03 16:50:33,047 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:33,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:33,048 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:50:33,048 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:33,048 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:33,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:35,554 INFO L134 CoverageAnalysis]: Checked inductivity of 2583 backedges. 1722 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:35,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:35,554 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:35,554 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:35,554 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:35,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:35,555 INFO 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 16:50:35,563 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:50:35,563 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:50:35,659 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:50:35,659 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:50:35,666 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:38,352 INFO L134 CoverageAnalysis]: Checked inductivity of 2583 backedges. 1722 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:38,353 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:40,671 INFO L134 CoverageAnalysis]: Checked inductivity of 2583 backedges. 1722 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:40,690 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:40,690 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 127 [2018-12-03 16:50:40,690 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:40,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2018-12-03 16:50:40,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2018-12-03 16:50:40,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3739, Invalid=12517, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 16:50:40,691 INFO L87 Difference]: Start difference. First operand 129 states and 130 transitions. Second operand 128 states. [2018-12-03 16:50:44,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:44,472 INFO L93 Difference]: Finished difference Result 217 states and 219 transitions. [2018-12-03 16:50:44,472 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-03 16:50:44,472 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 128 [2018-12-03 16:50:44,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:44,473 INFO L225 Difference]: With dead ends: 217 [2018-12-03 16:50:44,473 INFO L226 Difference]: Without dead ends: 130 [2018-12-03 16:50:44,474 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 130 SyntacticMatches, 83 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10250 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=6532, Invalid=22198, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 16:50:44,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-12-03 16:50:44,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2018-12-03 16:50:44,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-12-03 16:50:44,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-12-03 16:50:44,525 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 128 [2018-12-03 16:50:44,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:44,525 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-12-03 16:50:44,526 INFO L481 AbstractCegarLoop]: Interpolant automaton has 128 states. [2018-12-03 16:50:44,526 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-12-03 16:50:44,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-12-03 16:50:44,526 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:44,526 INFO L402 BasicCegarLoop]: trace histogram [42, 42, 41, 1, 1, 1, 1] [2018-12-03 16:50:44,527 INFO L423 AbstractCegarLoop]: === Iteration 84 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:44,527 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:44,527 INFO L82 PathProgramCache]: Analyzing trace with hash -845555199, now seen corresponding path program 82 times [2018-12-03 16:50:44,527 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:44,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:44,528 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:50:44,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:44,528 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:44,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:45,478 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 903 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:45,479 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:45,479 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:45,479 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:45,479 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:45,479 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:45,479 INFO 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 16:50:45,489 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:50:45,489 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:50:45,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:45,586 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:45,634 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 903 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:45,634 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:47,007 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 903 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:47,026 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:47,026 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45, 45] total 47 [2018-12-03 16:50:47,026 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:47,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-12-03 16:50:47,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-12-03 16:50:47,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1040, Invalid=1216, Unknown=0, NotChecked=0, Total=2256 [2018-12-03 16:50:47,027 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 48 states. [2018-12-03 16:50:48,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:48,094 INFO L93 Difference]: Finished difference Result 138 states and 139 transitions. [2018-12-03 16:50:48,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 16:50:48,094 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 129 [2018-12-03 16:50:48,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:48,095 INFO L225 Difference]: With dead ends: 138 [2018-12-03 16:50:48,095 INFO L226 Difference]: Without dead ends: 136 [2018-12-03 16:50:48,096 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 213 SyntacticMatches, 84 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3740 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3062, Invalid=5128, Unknown=0, NotChecked=0, Total=8190 [2018-12-03 16:50:48,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-12-03 16:50:48,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 132. [2018-12-03 16:50:48,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-12-03 16:50:48,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2018-12-03 16:50:48,140 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 129 [2018-12-03 16:50:48,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:48,140 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2018-12-03 16:50:48,140 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-12-03 16:50:48,140 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2018-12-03 16:50:48,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-12-03 16:50:48,141 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:48,141 INFO L402 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1] [2018-12-03 16:50:48,141 INFO L423 AbstractCegarLoop]: === Iteration 85 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:48,142 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:48,142 INFO L82 PathProgramCache]: Analyzing trace with hash -829794083, now seen corresponding path program 83 times [2018-12-03 16:50:48,142 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:48,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:48,143 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:50:48,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:48,143 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:48,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:50,752 INFO L134 CoverageAnalysis]: Checked inductivity of 2709 backedges. 1806 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:50,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:50,753 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:50,753 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:50,753 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:50,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:50,753 INFO 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 16:50:50,762 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:50:50,763 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:50:50,937 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2018-12-03 16:50:50,938 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:50:50,942 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:53,815 INFO L134 CoverageAnalysis]: Checked inductivity of 2709 backedges. 1806 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:53,815 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:56,210 INFO L134 CoverageAnalysis]: Checked inductivity of 2709 backedges. 1806 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:56,229 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:56,230 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 130 [2018-12-03 16:50:56,230 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:56,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2018-12-03 16:50:56,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2018-12-03 16:50:56,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3914, Invalid=13116, Unknown=0, NotChecked=0, Total=17030 [2018-12-03 16:50:56,231 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand 131 states. [2018-12-03 16:50:59,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:59,094 INFO L93 Difference]: Finished difference Result 222 states and 224 transitions. [2018-12-03 16:50:59,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2018-12-03 16:50:59,094 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 131 [2018-12-03 16:50:59,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:59,095 INFO L225 Difference]: With dead ends: 222 [2018-12-03 16:50:59,095 INFO L226 Difference]: Without dead ends: 133 [2018-12-03 16:50:59,096 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 133 SyntacticMatches, 85 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10752 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=6838, Invalid=23264, Unknown=0, NotChecked=0, Total=30102 [2018-12-03 16:50:59,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-12-03 16:50:59,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2018-12-03 16:50:59,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-12-03 16:50:59,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2018-12-03 16:50:59,135 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 131 [2018-12-03 16:50:59,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:59,135 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2018-12-03 16:50:59,135 INFO L481 AbstractCegarLoop]: Interpolant automaton has 131 states. [2018-12-03 16:50:59,135 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2018-12-03 16:50:59,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-12-03 16:50:59,136 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:59,136 INFO L402 BasicCegarLoop]: trace histogram [43, 43, 42, 1, 1, 1, 1] [2018-12-03 16:50:59,136 INFO L423 AbstractCegarLoop]: === Iteration 86 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:59,136 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:59,136 INFO L82 PathProgramCache]: Analyzing trace with hash 1595442758, now seen corresponding path program 84 times [2018-12-03 16:50:59,137 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:59,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:59,137 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:50:59,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:59,137 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:59,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:00,336 INFO L134 CoverageAnalysis]: Checked inductivity of 2752 backedges. 946 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:00,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:00,337 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:00,337 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:00,337 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:00,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:00,337 INFO 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 16:51:00,345 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:51:00,345 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:51:00,449 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:51:00,449 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:51:00,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:00,518 INFO L134 CoverageAnalysis]: Checked inductivity of 2752 backedges. 946 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:00,519 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:01,869 INFO L134 CoverageAnalysis]: Checked inductivity of 2752 backedges. 946 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:01,888 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:01,889 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 48 [2018-12-03 16:51:01,889 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:01,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-12-03 16:51:01,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-12-03 16:51:01,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1086, Invalid=1266, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 16:51:01,890 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand 49 states. [2018-12-03 16:51:02,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:02,967 INFO L93 Difference]: Finished difference Result 141 states and 142 transitions. [2018-12-03 16:51:02,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 16:51:02,967 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 132 [2018-12-03 16:51:02,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:02,968 INFO L225 Difference]: With dead ends: 141 [2018-12-03 16:51:02,968 INFO L226 Difference]: Without dead ends: 139 [2018-12-03 16:51:02,969 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 218 SyntacticMatches, 86 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3915 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3199, Invalid=5357, Unknown=0, NotChecked=0, Total=8556 [2018-12-03 16:51:02,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-12-03 16:51:03,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 135. [2018-12-03 16:51:03,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-12-03 16:51:03,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2018-12-03 16:51:03,010 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 132 [2018-12-03 16:51:03,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:03,010 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2018-12-03 16:51:03,010 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-12-03 16:51:03,010 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2018-12-03 16:51:03,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-12-03 16:51:03,011 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:03,011 INFO L402 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1] [2018-12-03 16:51:03,011 INFO L423 AbstractCegarLoop]: === Iteration 87 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:03,011 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:03,011 INFO L82 PathProgramCache]: Analyzing trace with hash -82901022, now seen corresponding path program 85 times [2018-12-03 16:51:03,012 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:03,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:03,012 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:51:03,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:03,012 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:03,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:05,703 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1892 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:05,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:05,703 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:05,704 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:05,704 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:05,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:05,704 INFO 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 16:51:05,716 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:51:05,716 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:51:05,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:05,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:08,750 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1892 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:08,750 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:11,250 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1892 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:11,269 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:11,269 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 133 [2018-12-03 16:51:11,269 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:11,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2018-12-03 16:51:11,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2018-12-03 16:51:11,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 16:51:11,271 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand 134 states. [2018-12-03 16:51:14,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:14,340 INFO L93 Difference]: Finished difference Result 227 states and 229 transitions. [2018-12-03 16:51:14,340 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2018-12-03 16:51:14,340 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 134 [2018-12-03 16:51:14,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:14,341 INFO L225 Difference]: With dead ends: 227 [2018-12-03 16:51:14,341 INFO L226 Difference]: Without dead ends: 136 [2018-12-03 16:51:14,342 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 136 SyntacticMatches, 87 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11266 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=7151, Invalid=24355, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 16:51:14,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-12-03 16:51:14,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2018-12-03 16:51:14,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-12-03 16:51:14,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2018-12-03 16:51:14,382 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 134 [2018-12-03 16:51:14,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:14,382 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2018-12-03 16:51:14,382 INFO L481 AbstractCegarLoop]: Interpolant automaton has 134 states. [2018-12-03 16:51:14,382 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2018-12-03 16:51:14,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-12-03 16:51:14,382 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:14,383 INFO L402 BasicCegarLoop]: trace histogram [44, 44, 43, 1, 1, 1, 1] [2018-12-03 16:51:14,383 INFO L423 AbstractCegarLoop]: === Iteration 88 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:14,383 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:14,383 INFO L82 PathProgramCache]: Analyzing trace with hash 207975897, now seen corresponding path program 86 times [2018-12-03 16:51:14,383 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:14,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:14,384 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:51:14,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:14,384 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:14,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:15,635 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 990 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:15,636 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:15,636 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:15,636 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:15,636 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:15,636 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:15,636 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:51:15,648 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:51:15,648 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:51:15,832 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2018-12-03 16:51:15,832 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:51:15,837 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:15,881 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 990 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:15,881 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:17,429 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 990 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:17,449 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:17,449 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 47] total 49 [2018-12-03 16:51:17,449 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:17,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 16:51:17,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 16:51:17,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1133, Invalid=1317, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 16:51:17,450 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand 50 states. [2018-12-03 16:51:18,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:18,550 INFO L93 Difference]: Finished difference Result 144 states and 145 transitions. [2018-12-03 16:51:18,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 16:51:18,550 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 135 [2018-12-03 16:51:18,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:18,551 INFO L225 Difference]: With dead ends: 144 [2018-12-03 16:51:18,551 INFO L226 Difference]: Without dead ends: 142 [2018-12-03 16:51:18,552 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 223 SyntacticMatches, 88 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4094 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=3339, Invalid=5591, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 16:51:18,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-12-03 16:51:18,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 138. [2018-12-03 16:51:18,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-12-03 16:51:18,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 139 transitions. [2018-12-03 16:51:18,603 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 139 transitions. Word has length 135 [2018-12-03 16:51:18,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:18,603 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 139 transitions. [2018-12-03 16:51:18,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 16:51:18,604 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 139 transitions. [2018-12-03 16:51:18,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-12-03 16:51:18,604 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:18,604 INFO L402 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1] [2018-12-03 16:51:18,604 INFO L423 AbstractCegarLoop]: === Iteration 89 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:18,604 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:18,605 INFO L82 PathProgramCache]: Analyzing trace with hash -1998692683, now seen corresponding path program 87 times [2018-12-03 16:51:18,605 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:18,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:18,605 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:51:18,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:18,605 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:18,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:21,376 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 1980 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:21,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:21,376 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:21,376 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:21,376 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:21,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:21,376 INFO 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 16:51:21,385 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:51:21,386 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:51:21,494 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:51:21,494 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:51:21,502 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:24,533 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 1980 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:24,533 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:27,097 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 1980 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:27,117 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:27,117 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 136 [2018-12-03 16:51:27,117 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:27,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 137 states [2018-12-03 16:51:27,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2018-12-03 16:51:27,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4276, Invalid=14356, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 16:51:27,119 INFO L87 Difference]: Start difference. First operand 138 states and 139 transitions. Second operand 137 states. [2018-12-03 16:51:30,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:30,295 INFO L93 Difference]: Finished difference Result 232 states and 234 transitions. [2018-12-03 16:51:30,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2018-12-03 16:51:30,295 INFO L78 Accepts]: Start accepts. Automaton has 137 states. Word has length 137 [2018-12-03 16:51:30,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:30,296 INFO L225 Difference]: With dead ends: 232 [2018-12-03 16:51:30,296 INFO L226 Difference]: Without dead ends: 139 [2018-12-03 16:51:30,297 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 139 SyntacticMatches, 89 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11792 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=7471, Invalid=25471, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 16:51:30,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-12-03 16:51:30,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-12-03 16:51:30,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-12-03 16:51:30,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2018-12-03 16:51:30,336 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 137 [2018-12-03 16:51:30,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:30,336 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2018-12-03 16:51:30,337 INFO L481 AbstractCegarLoop]: Interpolant automaton has 137 states. [2018-12-03 16:51:30,337 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2018-12-03 16:51:30,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2018-12-03 16:51:30,337 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:30,337 INFO L402 BasicCegarLoop]: trace histogram [45, 45, 44, 1, 1, 1, 1] [2018-12-03 16:51:30,337 INFO L423 AbstractCegarLoop]: === Iteration 90 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:30,337 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:30,338 INFO L82 PathProgramCache]: Analyzing trace with hash 566565214, now seen corresponding path program 88 times [2018-12-03 16:51:30,338 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:30,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:30,338 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:51:30,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:30,338 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:30,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:31,572 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1035 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:31,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:31,572 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:31,572 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:31,573 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:31,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:31,573 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:51:31,581 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:51:31,581 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:51:31,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:31,689 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:31,753 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1035 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:31,753 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:33,195 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1035 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:33,214 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:33,214 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 50 [2018-12-03 16:51:33,214 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:33,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-12-03 16:51:33,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-12-03 16:51:33,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1181, Invalid=1369, Unknown=0, NotChecked=0, Total=2550 [2018-12-03 16:51:33,215 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand 51 states. [2018-12-03 16:51:34,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:34,348 INFO L93 Difference]: Finished difference Result 147 states and 148 transitions. [2018-12-03 16:51:34,348 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 16:51:34,348 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 138 [2018-12-03 16:51:34,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:34,349 INFO L225 Difference]: With dead ends: 147 [2018-12-03 16:51:34,349 INFO L226 Difference]: Without dead ends: 145 [2018-12-03 16:51:34,350 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 228 SyntacticMatches, 90 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4277 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3482, Invalid=5830, Unknown=0, NotChecked=0, Total=9312 [2018-12-03 16:51:34,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-12-03 16:51:34,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 141. [2018-12-03 16:51:34,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-12-03 16:51:34,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 142 transitions. [2018-12-03 16:51:34,399 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 142 transitions. Word has length 138 [2018-12-03 16:51:34,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:34,399 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 142 transitions. [2018-12-03 16:51:34,399 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-12-03 16:51:34,399 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 142 transitions. [2018-12-03 16:51:34,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-12-03 16:51:34,400 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:34,400 INFO L402 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1] [2018-12-03 16:51:34,400 INFO L423 AbstractCegarLoop]: === Iteration 91 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:34,400 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:34,400 INFO L82 PathProgramCache]: Analyzing trace with hash -991742726, now seen corresponding path program 89 times [2018-12-03 16:51:34,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:34,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:34,401 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:51:34,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:34,401 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:34,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:37,361 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 2070 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:37,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:37,361 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:37,362 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:37,362 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:37,362 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:37,362 INFO 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 16:51:37,370 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:51:37,370 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:51:37,567 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2018-12-03 16:51:37,567 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:51:37,572 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:40,721 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 2070 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:40,721 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:43,430 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 2070 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:43,449 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:43,449 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 139 [2018-12-03 16:51:43,449 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:43,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2018-12-03 16:51:43,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2018-12-03 16:51:43,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4463, Invalid=14997, Unknown=0, NotChecked=0, Total=19460 [2018-12-03 16:51:43,450 INFO L87 Difference]: Start difference. First operand 141 states and 142 transitions. Second operand 140 states. [2018-12-03 16:51:47,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:47,028 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2018-12-03 16:51:47,028 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2018-12-03 16:51:47,028 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 140 [2018-12-03 16:51:47,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:47,029 INFO L225 Difference]: With dead ends: 237 [2018-12-03 16:51:47,029 INFO L226 Difference]: Without dead ends: 142 [2018-12-03 16:51:47,030 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 142 SyntacticMatches, 91 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12330 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=7798, Invalid=26612, Unknown=0, NotChecked=0, Total=34410 [2018-12-03 16:51:47,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-12-03 16:51:47,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-12-03 16:51:47,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-12-03 16:51:47,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2018-12-03 16:51:47,073 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 140 [2018-12-03 16:51:47,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:47,073 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2018-12-03 16:51:47,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has 140 states. [2018-12-03 16:51:47,073 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2018-12-03 16:51:47,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-12-03 16:51:47,074 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:47,074 INFO L402 BasicCegarLoop]: trace histogram [46, 46, 45, 1, 1, 1, 1] [2018-12-03 16:51:47,075 INFO L423 AbstractCegarLoop]: === Iteration 92 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:47,075 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:47,075 INFO L82 PathProgramCache]: Analyzing trace with hash 253169073, now seen corresponding path program 90 times [2018-12-03 16:51:47,075 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:47,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:47,076 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:51:47,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:47,076 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:47,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:48,041 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1081 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:48,042 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:48,042 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:48,042 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:48,042 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:48,042 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:48,042 INFO 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 16:51:48,067 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:51:48,067 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:51:48,181 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:51:48,181 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:51:48,187 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:48,246 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1081 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:48,246 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:49,860 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1081 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:49,879 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:49,879 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49, 49] total 51 [2018-12-03 16:51:49,879 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:49,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-12-03 16:51:49,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-12-03 16:51:49,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1230, Invalid=1422, Unknown=0, NotChecked=0, Total=2652 [2018-12-03 16:51:49,880 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand 52 states. [2018-12-03 16:51:51,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:51,104 INFO L93 Difference]: Finished difference Result 150 states and 151 transitions. [2018-12-03 16:51:51,104 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-12-03 16:51:51,104 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 141 [2018-12-03 16:51:51,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:51,105 INFO L225 Difference]: With dead ends: 150 [2018-12-03 16:51:51,105 INFO L226 Difference]: Without dead ends: 148 [2018-12-03 16:51:51,106 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 233 SyntacticMatches, 92 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4464 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3628, Invalid=6074, Unknown=0, NotChecked=0, Total=9702 [2018-12-03 16:51:51,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-12-03 16:51:51,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 144. [2018-12-03 16:51:51,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-12-03 16:51:51,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 145 transitions. [2018-12-03 16:51:51,151 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 145 transitions. Word has length 141 [2018-12-03 16:51:51,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:51,151 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 145 transitions. [2018-12-03 16:51:51,152 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-12-03 16:51:51,152 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 145 transitions. [2018-12-03 16:51:51,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-12-03 16:51:51,152 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:51,152 INFO L402 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1] [2018-12-03 16:51:51,152 INFO L423 AbstractCegarLoop]: === Iteration 93 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:51,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:51,153 INFO L82 PathProgramCache]: Analyzing trace with hash -1517723507, now seen corresponding path program 91 times [2018-12-03 16:51:51,153 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:51,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:51,153 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:51:51,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:51,154 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:51,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:54,046 INFO L134 CoverageAnalysis]: Checked inductivity of 3243 backedges. 2162 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:54,046 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:54,046 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:54,046 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:54,046 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:54,046 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:54,046 INFO 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 16:51:54,055 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:51:54,055 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:51:54,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:54,166 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:57,690 INFO L134 CoverageAnalysis]: Checked inductivity of 3243 backedges. 2162 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:57,690 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:00,230 INFO L134 CoverageAnalysis]: Checked inductivity of 3243 backedges. 2162 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:00,249 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:00,249 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 142 [2018-12-03 16:52:00,249 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:00,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 143 states [2018-12-03 16:52:00,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2018-12-03 16:52:00,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4654, Invalid=15652, Unknown=0, NotChecked=0, Total=20306 [2018-12-03 16:52:00,251 INFO L87 Difference]: Start difference. First operand 144 states and 145 transitions. Second operand 143 states. [2018-12-03 16:52:03,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:03,980 INFO L93 Difference]: Finished difference Result 242 states and 244 transitions. [2018-12-03 16:52:03,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2018-12-03 16:52:03,981 INFO L78 Accepts]: Start accepts. Automaton has 143 states. Word has length 143 [2018-12-03 16:52:03,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:03,981 INFO L225 Difference]: With dead ends: 242 [2018-12-03 16:52:03,981 INFO L226 Difference]: Without dead ends: 145 [2018-12-03 16:52:03,982 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 145 SyntacticMatches, 93 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12880 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=8132, Invalid=27778, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 16:52:03,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-12-03 16:52:04,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 145. [2018-12-03 16:52:04,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2018-12-03 16:52:04,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 146 transitions. [2018-12-03 16:52:04,027 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 146 transitions. Word has length 143 [2018-12-03 16:52:04,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:04,027 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 146 transitions. [2018-12-03 16:52:04,027 INFO L481 AbstractCegarLoop]: Interpolant automaton has 143 states. [2018-12-03 16:52:04,028 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 146 transitions. [2018-12-03 16:52:04,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2018-12-03 16:52:04,028 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:04,028 INFO L402 BasicCegarLoop]: trace histogram [47, 47, 46, 1, 1, 1, 1] [2018-12-03 16:52:04,028 INFO L423 AbstractCegarLoop]: === Iteration 94 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:04,028 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:04,029 INFO L82 PathProgramCache]: Analyzing trace with hash -1392920458, now seen corresponding path program 92 times [2018-12-03 16:52:04,029 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:04,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:04,029 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:52:04,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:04,029 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:04,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:05,083 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1128 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:05,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:05,083 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:05,084 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:05,084 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:05,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:05,084 INFO 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 16:52:05,091 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:52:05,092 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:52:05,295 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2018-12-03 16:52:05,295 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:52:05,300 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:05,362 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1128 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:05,362 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:07,303 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1128 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:07,322 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:07,322 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 52 [2018-12-03 16:52:07,322 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:07,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 16:52:07,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 16:52:07,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1280, Invalid=1476, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 16:52:07,323 INFO L87 Difference]: Start difference. First operand 145 states and 146 transitions. Second operand 53 states. [2018-12-03 16:52:08,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:08,559 INFO L93 Difference]: Finished difference Result 153 states and 154 transitions. [2018-12-03 16:52:08,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 16:52:08,559 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 144 [2018-12-03 16:52:08,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:08,560 INFO L225 Difference]: With dead ends: 153 [2018-12-03 16:52:08,561 INFO L226 Difference]: Without dead ends: 151 [2018-12-03 16:52:08,561 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 431 GetRequests, 238 SyntacticMatches, 94 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4655 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=3777, Invalid=6323, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 16:52:08,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-12-03 16:52:08,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 147. [2018-12-03 16:52:08,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-12-03 16:52:08,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2018-12-03 16:52:08,609 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 144 [2018-12-03 16:52:08,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:08,609 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2018-12-03 16:52:08,609 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 16:52:08,610 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2018-12-03 16:52:08,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-12-03 16:52:08,610 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:08,610 INFO L402 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1] [2018-12-03 16:52:08,610 INFO L423 AbstractCegarLoop]: === Iteration 95 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:08,610 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:08,611 INFO L82 PathProgramCache]: Analyzing trace with hash 1433169426, now seen corresponding path program 93 times [2018-12-03 16:52:08,611 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:08,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:08,611 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:52:08,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:08,611 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:08,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:11,438 INFO L134 CoverageAnalysis]: Checked inductivity of 3384 backedges. 2256 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:11,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:11,439 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:11,439 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:11,439 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:11,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:11,439 INFO 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 16:52:11,448 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:52:11,448 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:52:11,562 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:52:11,562 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:52:11,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:15,183 INFO L134 CoverageAnalysis]: Checked inductivity of 3384 backedges. 2256 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:15,184 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:18,147 INFO L134 CoverageAnalysis]: Checked inductivity of 3384 backedges. 2256 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:18,166 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:18,166 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 145 [2018-12-03 16:52:18,166 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:18,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2018-12-03 16:52:18,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2018-12-03 16:52:18,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4849, Invalid=16321, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 16:52:18,168 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand 146 states. [2018-12-03 16:52:20,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:20,724 INFO L93 Difference]: Finished difference Result 247 states and 249 transitions. [2018-12-03 16:52:20,724 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2018-12-03 16:52:20,724 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 146 [2018-12-03 16:52:20,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:20,725 INFO L225 Difference]: With dead ends: 247 [2018-12-03 16:52:20,725 INFO L226 Difference]: Without dead ends: 148 [2018-12-03 16:52:20,727 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 148 SyntacticMatches, 95 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13442 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=8473, Invalid=28969, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 16:52:20,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-12-03 16:52:20,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2018-12-03 16:52:20,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-12-03 16:52:20,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2018-12-03 16:52:20,795 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 146 [2018-12-03 16:52:20,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:20,795 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2018-12-03 16:52:20,795 INFO L481 AbstractCegarLoop]: Interpolant automaton has 146 states. [2018-12-03 16:52:20,795 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2018-12-03 16:52:20,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-12-03 16:52:20,796 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:20,796 INFO L402 BasicCegarLoop]: trace histogram [48, 48, 47, 1, 1, 1, 1] [2018-12-03 16:52:20,796 INFO L423 AbstractCegarLoop]: === Iteration 96 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:20,796 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:20,796 INFO L82 PathProgramCache]: Analyzing trace with hash -876151, now seen corresponding path program 94 times [2018-12-03 16:52:20,797 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:20,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:20,797 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:52:20,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:20,797 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:20,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:22,207 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1176 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:22,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:22,207 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:22,207 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:22,207 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:22,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:22,208 INFO 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 16:52:22,215 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:52:22,215 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:52:22,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:22,329 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:22,392 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1176 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:22,393 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:24,099 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1176 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:24,119 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:24,119 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51, 51] total 53 [2018-12-03 16:52:24,119 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:24,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-12-03 16:52:24,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-12-03 16:52:24,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1331, Invalid=1531, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 16:52:24,120 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand 54 states. [2018-12-03 16:52:25,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:25,384 INFO L93 Difference]: Finished difference Result 156 states and 157 transitions. [2018-12-03 16:52:25,384 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2018-12-03 16:52:25,384 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 147 [2018-12-03 16:52:25,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:25,385 INFO L225 Difference]: With dead ends: 156 [2018-12-03 16:52:25,385 INFO L226 Difference]: Without dead ends: 154 [2018-12-03 16:52:25,386 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 243 SyntacticMatches, 96 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4850 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=3929, Invalid=6577, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 16:52:25,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-12-03 16:52:25,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 150. [2018-12-03 16:52:25,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-12-03 16:52:25,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2018-12-03 16:52:25,435 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 147 [2018-12-03 16:52:25,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:25,435 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2018-12-03 16:52:25,436 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-12-03 16:52:25,436 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2018-12-03 16:52:25,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-12-03 16:52:25,436 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:25,436 INFO L402 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1] [2018-12-03 16:52:25,436 INFO L423 AbstractCegarLoop]: === Iteration 97 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:25,436 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:25,437 INFO L82 PathProgramCache]: Analyzing trace with hash -842047899, now seen corresponding path program 95 times [2018-12-03 16:52:25,437 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:25,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:25,437 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:52:25,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:25,438 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:25,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:28,792 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 2352 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:28,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:28,792 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:28,792 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:28,792 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:28,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:28,793 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:52:28,805 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:52:28,805 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:52:29,024 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2018-12-03 16:52:29,024 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:52:29,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:32,976 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 2352 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:32,976 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:35,666 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 2352 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:35,686 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:35,686 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 148 [2018-12-03 16:52:35,686 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:35,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 149 states [2018-12-03 16:52:35,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2018-12-03 16:52:35,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5048, Invalid=17004, Unknown=0, NotChecked=0, Total=22052 [2018-12-03 16:52:35,688 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand 149 states. [2018-12-03 16:52:39,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:39,764 INFO L93 Difference]: Finished difference Result 252 states and 254 transitions. [2018-12-03 16:52:39,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-12-03 16:52:39,764 INFO L78 Accepts]: Start accepts. Automaton has 149 states. Word has length 149 [2018-12-03 16:52:39,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:39,765 INFO L225 Difference]: With dead ends: 252 [2018-12-03 16:52:39,765 INFO L226 Difference]: Without dead ends: 151 [2018-12-03 16:52:39,767 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 151 SyntacticMatches, 97 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14016 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=8821, Invalid=30185, Unknown=0, NotChecked=0, Total=39006 [2018-12-03 16:52:39,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-12-03 16:52:39,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-12-03 16:52:39,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-12-03 16:52:39,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2018-12-03 16:52:39,820 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 149 [2018-12-03 16:52:39,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:39,820 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2018-12-03 16:52:39,821 INFO L481 AbstractCegarLoop]: Interpolant automaton has 149 states. [2018-12-03 16:52:39,821 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2018-12-03 16:52:39,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-12-03 16:52:39,821 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:39,822 INFO L402 BasicCegarLoop]: trace histogram [49, 49, 48, 1, 1, 1, 1] [2018-12-03 16:52:39,822 INFO L423 AbstractCegarLoop]: === Iteration 98 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:39,822 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:39,822 INFO L82 PathProgramCache]: Analyzing trace with hash -454138994, now seen corresponding path program 96 times [2018-12-03 16:52:39,822 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:39,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:39,823 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:52:39,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:39,823 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:39,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:40,948 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 1225 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:40,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:40,949 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:40,949 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:40,949 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:40,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:40,949 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 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 16:52:40,957 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:52:40,957 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:52:41,080 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:52:41,080 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:52:41,088 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:41,159 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 1225 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:41,159 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:43,238 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 1225 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:43,257 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:43,257 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52, 52] total 54 [2018-12-03 16:52:43,257 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:43,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 16:52:43,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 16:52:43,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1383, Invalid=1587, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 16:52:43,258 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand 55 states. [2018-12-03 16:52:44,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:44,569 INFO L93 Difference]: Finished difference Result 159 states and 160 transitions. [2018-12-03 16:52:44,570 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2018-12-03 16:52:44,570 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 150 [2018-12-03 16:52:44,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:44,570 INFO L225 Difference]: With dead ends: 159 [2018-12-03 16:52:44,571 INFO L226 Difference]: Without dead ends: 157 [2018-12-03 16:52:44,572 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 248 SyntacticMatches, 98 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5049 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=4084, Invalid=6836, Unknown=0, NotChecked=0, Total=10920 [2018-12-03 16:52:44,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-12-03 16:52:44,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 153. [2018-12-03 16:52:44,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-12-03 16:52:44,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 154 transitions. [2018-12-03 16:52:44,622 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 154 transitions. Word has length 150 [2018-12-03 16:52:44,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:44,623 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 154 transitions. [2018-12-03 16:52:44,623 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 16:52:44,623 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 154 transitions. [2018-12-03 16:52:44,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-12-03 16:52:44,623 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:44,623 INFO L402 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1] [2018-12-03 16:52:44,624 INFO L423 AbstractCegarLoop]: === Iteration 99 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:44,624 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:44,624 INFO L82 PathProgramCache]: Analyzing trace with hash 1659024170, now seen corresponding path program 97 times [2018-12-03 16:52:44,624 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:44,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:44,624 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:52:44,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:44,625 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:44,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:47,969 INFO L134 CoverageAnalysis]: Checked inductivity of 3675 backedges. 2450 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:47,969 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:47,969 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:47,969 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:47,970 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:47,970 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:47,970 INFO 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 16:52:47,978 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:52:47,978 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:52:48,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:48,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:51,863 INFO L134 CoverageAnalysis]: Checked inductivity of 3675 backedges. 2450 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:51,863 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:55,054 INFO L134 CoverageAnalysis]: Checked inductivity of 3675 backedges. 2450 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:55,073 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:55,073 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 151 [2018-12-03 16:52:55,073 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:55,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2018-12-03 16:52:55,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2018-12-03 16:52:55,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5251, Invalid=17701, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 16:52:55,075 INFO L87 Difference]: Start difference. First operand 153 states and 154 transitions. Second operand 152 states. [2018-12-03 16:52:59,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:59,198 INFO L93 Difference]: Finished difference Result 257 states and 259 transitions. [2018-12-03 16:52:59,198 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2018-12-03 16:52:59,198 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 152 [2018-12-03 16:52:59,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:59,199 INFO L225 Difference]: With dead ends: 257 [2018-12-03 16:52:59,199 INFO L226 Difference]: Without dead ends: 154 [2018-12-03 16:52:59,200 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 154 SyntacticMatches, 99 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14602 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=9176, Invalid=31426, Unknown=0, NotChecked=0, Total=40602 [2018-12-03 16:52:59,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-12-03 16:52:59,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 154. [2018-12-03 16:52:59,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-12-03 16:52:59,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2018-12-03 16:52:59,252 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 152 [2018-12-03 16:52:59,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:59,252 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2018-12-03 16:52:59,252 INFO L481 AbstractCegarLoop]: Interpolant automaton has 152 states. [2018-12-03 16:52:59,252 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2018-12-03 16:52:59,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-12-03 16:52:59,253 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:59,253 INFO L402 BasicCegarLoop]: trace histogram [50, 50, 49, 1, 1, 1, 1] [2018-12-03 16:52:59,253 INFO L423 AbstractCegarLoop]: === Iteration 100 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:59,253 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:59,253 INFO L82 PathProgramCache]: Analyzing trace with hash 96219489, now seen corresponding path program 98 times [2018-12-03 16:52:59,253 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:59,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:59,254 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:52:59,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:59,254 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:59,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:00,437 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1275 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:00,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:00,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:53:00,437 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:53:00,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:53:00,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:00,437 INFO 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 16:53:00,446 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:53:00,446 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:53:00,683 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-12-03 16:53:00,683 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:53:00,688 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:53:00,760 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1275 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:00,760 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:53:02,604 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1275 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:02,623 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:53:02,623 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 53] total 55 [2018-12-03 16:53:02,623 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:53:02,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-12-03 16:53:02,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-12-03 16:53:02,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1436, Invalid=1644, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 16:53:02,624 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand 56 states. [2018-12-03 16:53:04,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:53:04,137 INFO L93 Difference]: Finished difference Result 162 states and 163 transitions. [2018-12-03 16:53:04,138 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2018-12-03 16:53:04,138 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 153 [2018-12-03 16:53:04,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:53:04,139 INFO L225 Difference]: With dead ends: 162 [2018-12-03 16:53:04,139 INFO L226 Difference]: Without dead ends: 160 [2018-12-03 16:53:04,139 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 253 SyntacticMatches, 100 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5252 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=4242, Invalid=7100, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 16:53:04,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-03 16:53:04,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 156. [2018-12-03 16:53:04,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-12-03 16:53:04,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 157 transitions. [2018-12-03 16:53:04,190 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 157 transitions. Word has length 153 [2018-12-03 16:53:04,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:53:04,190 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 157 transitions. [2018-12-03 16:53:04,190 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-12-03 16:53:04,190 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 157 transitions. [2018-12-03 16:53:04,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-12-03 16:53:04,191 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:53:04,191 INFO L402 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1] [2018-12-03 16:53:04,191 INFO L423 AbstractCegarLoop]: === Iteration 101 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:53:04,192 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:53:04,192 INFO L82 PathProgramCache]: Analyzing trace with hash -2022418371, now seen corresponding path program 99 times [2018-12-03 16:53:04,192 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:53:04,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:04,193 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:53:04,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:04,193 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:53:04,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:07,381 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 2550 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:07,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:07,382 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:53:07,382 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:53:07,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:53:07,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:07,382 INFO 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 16:53:07,392 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:53:07,392 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:53:07,503 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:53:07,504 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:53:07,512 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:53:11,707 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 2550 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:11,708 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:53:14,985 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 2550 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:15,004 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:53:15,004 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 103, 103] total 154 [2018-12-03 16:53:15,004 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:53:15,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 155 states [2018-12-03 16:53:15,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2018-12-03 16:53:15,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5458, Invalid=18412, Unknown=0, NotChecked=0, Total=23870 [2018-12-03 16:53:15,006 INFO L87 Difference]: Start difference. First operand 156 states and 157 transitions. Second operand 155 states. [2018-12-03 16:53:19,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:53:19,305 INFO L93 Difference]: Finished difference Result 262 states and 264 transitions. [2018-12-03 16:53:19,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2018-12-03 16:53:19,305 INFO L78 Accepts]: Start accepts. Automaton has 155 states. Word has length 155 [2018-12-03 16:53:19,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:53:19,306 INFO L225 Difference]: With dead ends: 262 [2018-12-03 16:53:19,306 INFO L226 Difference]: Without dead ends: 157 [2018-12-03 16:53:19,307 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 157 SyntacticMatches, 101 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15200 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=9538, Invalid=32692, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 16:53:19,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-12-03 16:53:19,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2018-12-03 16:53:19,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-12-03 16:53:19,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2018-12-03 16:53:19,359 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 155 [2018-12-03 16:53:19,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:53:19,359 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2018-12-03 16:53:19,359 INFO L481 AbstractCegarLoop]: Interpolant automaton has 155 states. [2018-12-03 16:53:19,359 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2018-12-03 16:53:19,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-12-03 16:53:19,360 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:53:19,360 INFO L402 BasicCegarLoop]: trace histogram [51, 51, 50, 1, 1, 1, 1] [2018-12-03 16:53:19,360 INFO L423 AbstractCegarLoop]: === Iteration 102 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:53:19,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:53:19,360 INFO L82 PathProgramCache]: Analyzing trace with hash -2091181402, now seen corresponding path program 100 times [2018-12-03 16:53:19,361 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:53:19,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:19,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:53:19,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:19,361 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:53:19,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:20,557 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1326 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:20,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:20,557 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:53:20,557 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:53:20,557 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:53:20,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:20,557 INFO 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 16:53:20,566 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:53:20,566 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:53:20,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:20,688 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:53:20,741 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1326 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:20,741 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:53:22,660 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1326 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:22,679 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:53:22,679 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 56 [2018-12-03 16:53:22,679 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:53:22,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-12-03 16:53:22,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-12-03 16:53:22,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1490, Invalid=1702, Unknown=0, NotChecked=0, Total=3192 [2018-12-03 16:53:22,681 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand 57 states. [2018-12-03 16:53:24,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:53:24,242 INFO L93 Difference]: Finished difference Result 165 states and 166 transitions. [2018-12-03 16:53:24,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2018-12-03 16:53:24,243 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 156 [2018-12-03 16:53:24,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:53:24,244 INFO L225 Difference]: With dead ends: 165 [2018-12-03 16:53:24,244 INFO L226 Difference]: Without dead ends: 163 [2018-12-03 16:53:24,245 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 258 SyntacticMatches, 102 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5459 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=4403, Invalid=7369, Unknown=0, NotChecked=0, Total=11772 [2018-12-03 16:53:24,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-12-03 16:53:24,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 159. [2018-12-03 16:53:24,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-12-03 16:53:24,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2018-12-03 16:53:24,303 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 156 [2018-12-03 16:53:24,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:53:24,304 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2018-12-03 16:53:24,304 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-12-03 16:53:24,304 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2018-12-03 16:53:24,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-12-03 16:53:24,304 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:53:24,304 INFO L402 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1] [2018-12-03 16:53:24,304 INFO L423 AbstractCegarLoop]: === Iteration 103 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:53:24,305 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:53:24,305 INFO L82 PathProgramCache]: Analyzing trace with hash 419300418, now seen corresponding path program 101 times [2018-12-03 16:53:24,305 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:53:24,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:24,305 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:53:24,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:24,306 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:53:24,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:27,625 INFO L134 CoverageAnalysis]: Checked inductivity of 3978 backedges. 2652 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:27,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:27,626 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:53:27,626 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:53:27,626 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:53:27,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:27,626 INFO 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 16:53:27,637 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:53:27,637 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:53:27,885 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2018-12-03 16:53:27,885 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:53:27,891 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:53:32,198 INFO L134 CoverageAnalysis]: Checked inductivity of 3978 backedges. 2652 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:32,198 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:53:35,562 INFO L134 CoverageAnalysis]: Checked inductivity of 3978 backedges. 2652 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:35,583 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:53:35,583 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 105, 105] total 157 [2018-12-03 16:53:35,583 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:53:35,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2018-12-03 16:53:35,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2018-12-03 16:53:35,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5669, Invalid=19137, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 16:53:35,585 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand 158 states. [2018-12-03 16:53:40,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:53:40,100 INFO L93 Difference]: Finished difference Result 267 states and 269 transitions. [2018-12-03 16:53:40,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2018-12-03 16:53:40,100 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 158 [2018-12-03 16:53:40,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:53:40,101 INFO L225 Difference]: With dead ends: 267 [2018-12-03 16:53:40,102 INFO L226 Difference]: Without dead ends: 160 [2018-12-03 16:53:40,104 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 160 SyntacticMatches, 103 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15810 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=9907, Invalid=33983, Unknown=0, NotChecked=0, Total=43890 [2018-12-03 16:53:40,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-03 16:53:40,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-12-03 16:53:40,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-12-03 16:53:40,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2018-12-03 16:53:40,160 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 158 [2018-12-03 16:53:40,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:53:40,161 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2018-12-03 16:53:40,161 INFO L481 AbstractCegarLoop]: Interpolant automaton has 158 states. [2018-12-03 16:53:40,161 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2018-12-03 16:53:40,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-12-03 16:53:40,161 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:53:40,161 INFO L402 BasicCegarLoop]: trace histogram [52, 52, 51, 1, 1, 1, 1] [2018-12-03 16:53:40,161 INFO L423 AbstractCegarLoop]: === Iteration 104 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:53:40,162 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:53:40,162 INFO L82 PathProgramCache]: Analyzing trace with hash 599244089, now seen corresponding path program 102 times [2018-12-03 16:53:40,162 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:53:40,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:40,162 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:53:40,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:40,163 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:53:40,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:41,414 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1378 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:41,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:41,414 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:53:41,414 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:53:41,415 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:53:41,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:41,415 INFO 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 16:53:41,423 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:53:41,423 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:53:41,555 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:53:41,555 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:53:41,563 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:53:41,636 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1378 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:41,636 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:53:43,657 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1378 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:43,677 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:53:43,678 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55, 55] total 57 [2018-12-03 16:53:43,678 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:53:43,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-12-03 16:53:43,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-12-03 16:53:43,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1545, Invalid=1761, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 16:53:43,678 INFO L87 Difference]: Start difference. First operand 160 states and 161 transitions. Second operand 58 states. [2018-12-03 16:53:45,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:53:45,240 INFO L93 Difference]: Finished difference Result 168 states and 169 transitions. [2018-12-03 16:53:45,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2018-12-03 16:53:45,240 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 159 [2018-12-03 16:53:45,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:53:45,241 INFO L225 Difference]: With dead ends: 168 [2018-12-03 16:53:45,242 INFO L226 Difference]: Without dead ends: 166 [2018-12-03 16:53:45,243 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 263 SyntacticMatches, 104 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5670 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=4567, Invalid=7643, Unknown=0, NotChecked=0, Total=12210 [2018-12-03 16:53:45,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-03 16:53:45,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 162. [2018-12-03 16:53:45,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-12-03 16:53:45,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 163 transitions. [2018-12-03 16:53:45,310 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 163 transitions. Word has length 159 [2018-12-03 16:53:45,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:53:45,310 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 163 transitions. [2018-12-03 16:53:45,310 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-12-03 16:53:45,311 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 163 transitions. [2018-12-03 16:53:45,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-12-03 16:53:45,311 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:53:45,311 INFO L402 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1] [2018-12-03 16:53:45,311 INFO L423 AbstractCegarLoop]: === Iteration 105 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:53:45,312 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:53:45,312 INFO L82 PathProgramCache]: Analyzing trace with hash 347885077, now seen corresponding path program 103 times [2018-12-03 16:53:45,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:53:45,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:45,312 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:53:45,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:45,313 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:53:45,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:48,790 INFO L134 CoverageAnalysis]: Checked inductivity of 4134 backedges. 2756 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:48,790 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:48,790 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:53:48,791 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:53:48,791 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:53:48,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:48,791 INFO 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 16:53:48,799 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:53:48,799 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:53:48,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:48,925 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:53:53,226 INFO L134 CoverageAnalysis]: Checked inductivity of 4134 backedges. 2756 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:53,226 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:53:56,690 INFO L134 CoverageAnalysis]: Checked inductivity of 4134 backedges. 2756 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:56,709 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:53:56,709 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [107, 107, 107] total 160 [2018-12-03 16:53:56,709 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:53:56,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 161 states [2018-12-03 16:53:56,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2018-12-03 16:53:56,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5884, Invalid=19876, Unknown=0, NotChecked=0, Total=25760 [2018-12-03 16:53:56,711 INFO L87 Difference]: Start difference. First operand 162 states and 163 transitions. Second operand 161 states. [2018-12-03 16:54:01,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:54:01,474 INFO L93 Difference]: Finished difference Result 272 states and 274 transitions. [2018-12-03 16:54:01,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2018-12-03 16:54:01,474 INFO L78 Accepts]: Start accepts. Automaton has 161 states. Word has length 161 [2018-12-03 16:54:01,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:54:01,475 INFO L225 Difference]: With dead ends: 272 [2018-12-03 16:54:01,475 INFO L226 Difference]: Without dead ends: 163 [2018-12-03 16:54:01,476 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 163 SyntacticMatches, 105 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16432 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=10283, Invalid=35299, Unknown=0, NotChecked=0, Total=45582 [2018-12-03 16:54:01,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-12-03 16:54:01,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2018-12-03 16:54:01,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2018-12-03 16:54:01,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 164 transitions. [2018-12-03 16:54:01,535 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 164 transitions. Word has length 161 [2018-12-03 16:54:01,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:54:01,536 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 164 transitions. [2018-12-03 16:54:01,536 INFO L481 AbstractCegarLoop]: Interpolant automaton has 161 states. [2018-12-03 16:54:01,536 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 164 transitions. [2018-12-03 16:54:01,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2018-12-03 16:54:01,536 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:54:01,537 INFO L402 BasicCegarLoop]: trace histogram [53, 53, 52, 1, 1, 1, 1] [2018-12-03 16:54:01,537 INFO L423 AbstractCegarLoop]: === Iteration 106 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:54:01,537 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:54:01,537 INFO L82 PathProgramCache]: Analyzing trace with hash 930602430, now seen corresponding path program 104 times [2018-12-03 16:54:01,537 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:54:01,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:01,538 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:54:01,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:01,538 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:54:01,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:02,791 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1431 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:02,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:02,791 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:54:02,791 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:54:02,791 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:54:02,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:02,791 INFO 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 16:54:02,799 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:54:02,799 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:54:03,058 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2018-12-03 16:54:03,058 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:54:03,064 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:54:03,122 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1431 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:03,123 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:54:05,476 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1431 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:05,495 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:54:05,495 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56, 56] total 58 [2018-12-03 16:54:05,496 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:54:05,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 16:54:05,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 16:54:05,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1601, Invalid=1821, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 16:54:05,497 INFO L87 Difference]: Start difference. First operand 163 states and 164 transitions. Second operand 59 states. [2018-12-03 16:54:06,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:54:06,992 INFO L93 Difference]: Finished difference Result 171 states and 172 transitions. [2018-12-03 16:54:06,992 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-12-03 16:54:06,992 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 162 [2018-12-03 16:54:06,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:54:06,993 INFO L225 Difference]: With dead ends: 171 [2018-12-03 16:54:06,993 INFO L226 Difference]: Without dead ends: 169 [2018-12-03 16:54:06,994 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 268 SyntacticMatches, 106 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5885 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=4734, Invalid=7922, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 16:54:06,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-12-03 16:54:07,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 165. [2018-12-03 16:54:07,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-12-03 16:54:07,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 166 transitions. [2018-12-03 16:54:07,049 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 166 transitions. Word has length 162 [2018-12-03 16:54:07,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:54:07,050 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 166 transitions. [2018-12-03 16:54:07,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 16:54:07,050 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 166 transitions. [2018-12-03 16:54:07,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-12-03 16:54:07,050 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:54:07,050 INFO L402 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1] [2018-12-03 16:54:07,051 INFO L423 AbstractCegarLoop]: === Iteration 107 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:54:07,051 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:54:07,051 INFO L82 PathProgramCache]: Analyzing trace with hash 955670874, now seen corresponding path program 105 times [2018-12-03 16:54:07,051 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:54:07,051 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:07,052 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:54:07,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:07,052 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:54:07,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:10,869 INFO L134 CoverageAnalysis]: Checked inductivity of 4293 backedges. 2862 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:10,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:10,869 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:54:10,869 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:54:10,869 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:54:10,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:10,869 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:54:10,879 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:54:10,879 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:54:11,011 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:54:11,011 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:54:11,025 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:54:15,658 INFO L134 CoverageAnalysis]: Checked inductivity of 4293 backedges. 2862 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:15,658 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:54:18,947 INFO L134 CoverageAnalysis]: Checked inductivity of 4293 backedges. 2862 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:18,966 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:54:18,966 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [109, 109, 109] total 163 [2018-12-03 16:54:18,967 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:54:18,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 164 states [2018-12-03 16:54:18,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2018-12-03 16:54:18,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6103, Invalid=20629, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 16:54:18,968 INFO L87 Difference]: Start difference. First operand 165 states and 166 transitions. Second operand 164 states. [2018-12-03 16:54:22,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:54:22,281 INFO L93 Difference]: Finished difference Result 277 states and 279 transitions. [2018-12-03 16:54:22,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2018-12-03 16:54:22,281 INFO L78 Accepts]: Start accepts. Automaton has 164 states. Word has length 164 [2018-12-03 16:54:22,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:54:22,282 INFO L225 Difference]: With dead ends: 277 [2018-12-03 16:54:22,282 INFO L226 Difference]: Without dead ends: 166 [2018-12-03 16:54:22,284 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 166 SyntacticMatches, 107 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17066 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=10666, Invalid=36640, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 16:54:22,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-03 16:54:22,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2018-12-03 16:54:22,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-12-03 16:54:22,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2018-12-03 16:54:22,376 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 164 [2018-12-03 16:54:22,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:54:22,376 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2018-12-03 16:54:22,376 INFO L481 AbstractCegarLoop]: Interpolant automaton has 164 states. [2018-12-03 16:54:22,376 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2018-12-03 16:54:22,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-12-03 16:54:22,377 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:54:22,377 INFO L402 BasicCegarLoop]: trace histogram [54, 54, 53, 1, 1, 1, 1] [2018-12-03 16:54:22,377 INFO L423 AbstractCegarLoop]: === Iteration 108 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:54:22,377 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:54:22,377 INFO L82 PathProgramCache]: Analyzing trace with hash 430523665, now seen corresponding path program 106 times [2018-12-03 16:54:22,377 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:54:22,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:22,378 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:54:22,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:22,378 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:54:22,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:23,743 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1485 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:23,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:23,744 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:54:23,744 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:54:23,744 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:54:23,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:23,744 INFO 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 16:54:23,753 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:54:23,753 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:54:23,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:23,882 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:54:23,960 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1485 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:23,961 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:54:26,368 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1485 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:26,388 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:54:26,388 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57, 57] total 59 [2018-12-03 16:54:26,388 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:54:26,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-12-03 16:54:26,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-12-03 16:54:26,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1658, Invalid=1882, Unknown=0, NotChecked=0, Total=3540 [2018-12-03 16:54:26,389 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand 60 states. [2018-12-03 16:54:27,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:54:27,902 INFO L93 Difference]: Finished difference Result 174 states and 175 transitions. [2018-12-03 16:54:27,902 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2018-12-03 16:54:27,903 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 165 [2018-12-03 16:54:27,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:54:27,903 INFO L225 Difference]: With dead ends: 174 [2018-12-03 16:54:27,904 INFO L226 Difference]: Without dead ends: 172 [2018-12-03 16:54:27,905 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 273 SyntacticMatches, 108 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6104 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=4904, Invalid=8206, Unknown=0, NotChecked=0, Total=13110 [2018-12-03 16:54:27,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-12-03 16:54:27,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 168. [2018-12-03 16:54:27,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-12-03 16:54:27,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 169 transitions. [2018-12-03 16:54:27,969 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 169 transitions. Word has length 165 [2018-12-03 16:54:27,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:54:27,970 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 169 transitions. [2018-12-03 16:54:27,970 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-12-03 16:54:27,970 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 169 transitions. [2018-12-03 16:54:27,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-12-03 16:54:27,970 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:54:27,970 INFO L402 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1] [2018-12-03 16:54:27,971 INFO L423 AbstractCegarLoop]: === Iteration 109 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:54:27,971 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:54:27,971 INFO L82 PathProgramCache]: Analyzing trace with hash 1416314861, now seen corresponding path program 107 times [2018-12-03 16:54:27,971 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:54:27,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:27,971 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:54:27,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:27,972 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:54:28,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:31,962 INFO L134 CoverageAnalysis]: Checked inductivity of 4455 backedges. 2970 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:31,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:31,962 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:54:31,962 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:54:31,962 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:54:31,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:31,962 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:54:31,971 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:54:31,971 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:54:32,247 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2018-12-03 16:54:32,247 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:54:32,254 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:54:37,020 INFO L134 CoverageAnalysis]: Checked inductivity of 4455 backedges. 2970 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:37,020 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:54:40,716 INFO L134 CoverageAnalysis]: Checked inductivity of 4455 backedges. 2970 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:40,735 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:54:40,736 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 111, 111] total 166 [2018-12-03 16:54:40,736 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:54:40,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 167 states [2018-12-03 16:54:40,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 167 interpolants. [2018-12-03 16:54:40,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6326, Invalid=21396, Unknown=0, NotChecked=0, Total=27722 [2018-12-03 16:54:40,737 INFO L87 Difference]: Start difference. First operand 168 states and 169 transitions. Second operand 167 states. [2018-12-03 16:54:45,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:54:45,539 INFO L93 Difference]: Finished difference Result 282 states and 284 transitions. [2018-12-03 16:54:45,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2018-12-03 16:54:45,539 INFO L78 Accepts]: Start accepts. Automaton has 167 states. Word has length 167 [2018-12-03 16:54:45,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:54:45,539 INFO L225 Difference]: With dead ends: 282 [2018-12-03 16:54:45,540 INFO L226 Difference]: Without dead ends: 169 [2018-12-03 16:54:45,541 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 169 SyntacticMatches, 109 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17712 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=11056, Invalid=38006, Unknown=0, NotChecked=0, Total=49062 [2018-12-03 16:54:45,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-12-03 16:54:45,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-12-03 16:54:45,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-12-03 16:54:45,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-12-03 16:54:45,613 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 167 [2018-12-03 16:54:45,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:54:45,613 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-12-03 16:54:45,614 INFO L481 AbstractCegarLoop]: Interpolant automaton has 167 states. [2018-12-03 16:54:45,614 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-12-03 16:54:45,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-12-03 16:54:45,614 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:54:45,614 INFO L402 BasicCegarLoop]: trace histogram [55, 55, 54, 1, 1, 1, 1] [2018-12-03 16:54:45,615 INFO L423 AbstractCegarLoop]: === Iteration 110 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:54:45,615 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:54:45,615 INFO L82 PathProgramCache]: Analyzing trace with hash -973296426, now seen corresponding path program 108 times [2018-12-03 16:54:45,615 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:54:45,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:45,616 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:54:45,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:45,616 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:54:45,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:47,086 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1540 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:47,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:47,087 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:54:47,087 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:54:47,087 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:54:47,087 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:47,087 INFO 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 16:54:47,095 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:54:47,095 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:54:47,232 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:54:47,232 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:54:47,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:54:47,320 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1540 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:47,321 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:54:49,529 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1540 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:49,548 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:54:49,548 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 60 [2018-12-03 16:54:49,548 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:54:49,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-12-03 16:54:49,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-12-03 16:54:49,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1716, Invalid=1944, Unknown=0, NotChecked=0, Total=3660 [2018-12-03 16:54:49,549 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 61 states. [2018-12-03 16:54:51,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:54:51,400 INFO L93 Difference]: Finished difference Result 177 states and 178 transitions. [2018-12-03 16:54:51,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2018-12-03 16:54:51,400 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 168 [2018-12-03 16:54:51,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:54:51,401 INFO L225 Difference]: With dead ends: 177 [2018-12-03 16:54:51,401 INFO L226 Difference]: Without dead ends: 175 [2018-12-03 16:54:51,401 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 278 SyntacticMatches, 110 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6327 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=5077, Invalid=8495, Unknown=0, NotChecked=0, Total=13572 [2018-12-03 16:54:51,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-12-03 16:54:51,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 171. [2018-12-03 16:54:51,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-12-03 16:54:51,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 172 transitions. [2018-12-03 16:54:51,490 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 172 transitions. Word has length 168 [2018-12-03 16:54:51,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:54:51,491 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 172 transitions. [2018-12-03 16:54:51,491 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-12-03 16:54:51,491 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 172 transitions. [2018-12-03 16:54:51,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-12-03 16:54:51,491 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:54:51,491 INFO L402 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1] [2018-12-03 16:54:51,491 INFO L423 AbstractCegarLoop]: === Iteration 111 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:54:51,492 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:54:51,492 INFO L82 PathProgramCache]: Analyzing trace with hash 964938354, now seen corresponding path program 109 times [2018-12-03 16:54:51,492 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:54:51,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:51,492 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:54:51,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:51,493 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:54:51,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:55,445 INFO L134 CoverageAnalysis]: Checked inductivity of 4620 backedges. 3080 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:55,446 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:55,446 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:54:55,446 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:54:55,446 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:54:55,446 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:55,446 INFO 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 16:54:55,454 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:54:55,454 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:54:55,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:55,587 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:55:00,289 INFO L134 CoverageAnalysis]: Checked inductivity of 4620 backedges. 3080 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:00,289 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:55:04,224 INFO L134 CoverageAnalysis]: Checked inductivity of 4620 backedges. 3080 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:04,243 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:55:04,244 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [113, 113, 113] total 169 [2018-12-03 16:55:04,244 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:55:04,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 170 states [2018-12-03 16:55:04,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2018-12-03 16:55:04,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6553, Invalid=22177, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 16:55:04,245 INFO L87 Difference]: Start difference. First operand 171 states and 172 transitions. Second operand 170 states. [2018-12-03 16:55:09,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:55:09,384 INFO L93 Difference]: Finished difference Result 287 states and 289 transitions. [2018-12-03 16:55:09,384 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2018-12-03 16:55:09,385 INFO L78 Accepts]: Start accepts. Automaton has 170 states. Word has length 170 [2018-12-03 16:55:09,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:55:09,385 INFO L225 Difference]: With dead ends: 287 [2018-12-03 16:55:09,385 INFO L226 Difference]: Without dead ends: 172 [2018-12-03 16:55:09,387 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 172 SyntacticMatches, 111 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18370 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=11453, Invalid=39397, Unknown=0, NotChecked=0, Total=50850 [2018-12-03 16:55:09,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-12-03 16:55:09,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2018-12-03 16:55:09,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-12-03 16:55:09,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2018-12-03 16:55:09,472 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 170 [2018-12-03 16:55:09,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:55:09,472 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2018-12-03 16:55:09,472 INFO L481 AbstractCegarLoop]: Interpolant automaton has 170 states. [2018-12-03 16:55:09,472 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2018-12-03 16:55:09,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-12-03 16:55:09,472 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:55:09,473 INFO L402 BasicCegarLoop]: trace histogram [56, 56, 55, 1, 1, 1, 1] [2018-12-03 16:55:09,473 INFO L423 AbstractCegarLoop]: === Iteration 112 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:55:09,473 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:55:09,473 INFO L82 PathProgramCache]: Analyzing trace with hash 1138018537, now seen corresponding path program 110 times [2018-12-03 16:55:09,473 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:55:09,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:09,474 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:55:09,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:09,474 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:55:09,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:55:11,221 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1596 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:11,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:11,221 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:55:11,221 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:55:11,221 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:55:11,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:11,221 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:55:11,230 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:55:11,230 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:55:11,515 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 56 check-sat command(s) [2018-12-03 16:55:11,516 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:55:11,522 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:55:11,602 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1596 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:11,603 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:55:13,875 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1596 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:13,894 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:55:13,894 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 59, 59] total 61 [2018-12-03 16:55:13,895 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:55:13,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-12-03 16:55:13,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-12-03 16:55:13,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1775, Invalid=2007, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 16:55:13,896 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand 62 states. [2018-12-03 16:55:15,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:55:15,524 INFO L93 Difference]: Finished difference Result 180 states and 181 transitions. [2018-12-03 16:55:15,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2018-12-03 16:55:15,524 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 171 [2018-12-03 16:55:15,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:55:15,525 INFO L225 Difference]: With dead ends: 180 [2018-12-03 16:55:15,525 INFO L226 Difference]: Without dead ends: 178 [2018-12-03 16:55:15,526 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 283 SyntacticMatches, 112 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6554 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=5253, Invalid=8789, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 16:55:15,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-12-03 16:55:15,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 174. [2018-12-03 16:55:15,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-12-03 16:55:15,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 175 transitions. [2018-12-03 16:55:15,594 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 175 transitions. Word has length 171 [2018-12-03 16:55:15,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:55:15,594 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 175 transitions. [2018-12-03 16:55:15,594 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-12-03 16:55:15,595 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 175 transitions. [2018-12-03 16:55:15,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-12-03 16:55:15,595 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:55:15,595 INFO L402 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1] [2018-12-03 16:55:15,595 INFO L423 AbstractCegarLoop]: === Iteration 113 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:55:15,595 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:55:15,596 INFO L82 PathProgramCache]: Analyzing trace with hash -1580913211, now seen corresponding path program 111 times [2018-12-03 16:55:15,596 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:55:15,596 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:15,596 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:55:15,596 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:15,596 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:55:15,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:55:19,780 INFO L134 CoverageAnalysis]: Checked inductivity of 4788 backedges. 3192 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:19,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:19,780 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:55:19,780 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:55:19,780 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:55:19,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:19,780 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:55:19,808 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:55:19,808 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:55:19,947 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:55:19,948 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:55:19,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:55:25,074 INFO L134 CoverageAnalysis]: Checked inductivity of 4788 backedges. 3192 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:25,075 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:55:29,078 INFO L134 CoverageAnalysis]: Checked inductivity of 4788 backedges. 3192 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:29,098 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:55:29,098 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 115, 115] total 172 [2018-12-03 16:55:29,098 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:55:29,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 173 states [2018-12-03 16:55:29,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 173 interpolants. [2018-12-03 16:55:29,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6784, Invalid=22972, Unknown=0, NotChecked=0, Total=29756 [2018-12-03 16:55:29,100 INFO L87 Difference]: Start difference. First operand 174 states and 175 transitions. Second operand 173 states. [2018-12-03 16:55:34,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:55:34,297 INFO L93 Difference]: Finished difference Result 292 states and 294 transitions. [2018-12-03 16:55:34,297 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2018-12-03 16:55:34,297 INFO L78 Accepts]: Start accepts. Automaton has 173 states. Word has length 173 [2018-12-03 16:55:34,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:55:34,297 INFO L225 Difference]: With dead ends: 292 [2018-12-03 16:55:34,297 INFO L226 Difference]: Without dead ends: 175 [2018-12-03 16:55:34,299 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 175 SyntacticMatches, 113 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19040 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=11857, Invalid=40813, Unknown=0, NotChecked=0, Total=52670 [2018-12-03 16:55:34,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-12-03 16:55:34,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2018-12-03 16:55:34,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-12-03 16:55:34,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 176 transitions. [2018-12-03 16:55:34,362 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 176 transitions. Word has length 173 [2018-12-03 16:55:34,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:55:34,362 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 176 transitions. [2018-12-03 16:55:34,362 INFO L481 AbstractCegarLoop]: Interpolant automaton has 173 states. [2018-12-03 16:55:34,362 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 176 transitions. [2018-12-03 16:55:34,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-12-03 16:55:34,363 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:55:34,363 INFO L402 BasicCegarLoop]: trace histogram [57, 57, 56, 1, 1, 1, 1] [2018-12-03 16:55:34,363 INFO L423 AbstractCegarLoop]: === Iteration 114 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:55:34,363 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:55:34,363 INFO L82 PathProgramCache]: Analyzing trace with hash 690063342, now seen corresponding path program 112 times [2018-12-03 16:55:34,364 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:55:34,364 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:34,364 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:55:34,364 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:34,364 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:55:34,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:55:35,820 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1653 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:35,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:35,821 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:55:35,821 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:55:35,821 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:55:35,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:35,821 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:55:35,829 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:55:35,829 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:55:35,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:55:35,990 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:55:36,059 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1653 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:36,059 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:55:38,576 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1653 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:38,595 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:55:38,595 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60, 60] total 62 [2018-12-03 16:55:38,595 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:55:38,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 16:55:38,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 16:55:38,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1835, Invalid=2071, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 16:55:38,596 INFO L87 Difference]: Start difference. First operand 175 states and 176 transitions. Second operand 63 states. [2018-12-03 16:55:40,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:55:40,222 INFO L93 Difference]: Finished difference Result 183 states and 184 transitions. [2018-12-03 16:55:40,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2018-12-03 16:55:40,222 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 174 [2018-12-03 16:55:40,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:55:40,223 INFO L225 Difference]: With dead ends: 183 [2018-12-03 16:55:40,223 INFO L226 Difference]: Without dead ends: 181 [2018-12-03 16:55:40,224 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 521 GetRequests, 288 SyntacticMatches, 114 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6785 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=5432, Invalid=9088, Unknown=0, NotChecked=0, Total=14520 [2018-12-03 16:55:40,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-12-03 16:55:40,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 177. [2018-12-03 16:55:40,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-12-03 16:55:40,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 178 transitions. [2018-12-03 16:55:40,293 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 178 transitions. Word has length 174 [2018-12-03 16:55:40,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:55:40,293 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 178 transitions. [2018-12-03 16:55:40,293 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 16:55:40,293 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 178 transitions. [2018-12-03 16:55:40,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-12-03 16:55:40,294 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:55:40,294 INFO L402 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1] [2018-12-03 16:55:40,294 INFO L423 AbstractCegarLoop]: === Iteration 115 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:55:40,294 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:55:40,294 INFO L82 PathProgramCache]: Analyzing trace with hash 1725841290, now seen corresponding path program 113 times [2018-12-03 16:55:40,294 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:55:40,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:40,295 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:55:40,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:40,295 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:55:40,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:55:44,746 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 3306 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:44,746 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:44,746 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:55:44,746 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:55:44,747 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:55:44,747 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:44,747 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:55:44,755 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:55:44,755 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:55:45,054 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2018-12-03 16:55:45,054 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:55:45,062 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:55:50,373 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 3306 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:50,373 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:55:54,524 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 3306 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:54,544 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:55:54,544 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 175 [2018-12-03 16:55:54,544 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:55:54,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 176 states [2018-12-03 16:55:54,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2018-12-03 16:55:54,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7019, Invalid=23781, Unknown=0, NotChecked=0, Total=30800 [2018-12-03 16:55:54,546 INFO L87 Difference]: Start difference. First operand 177 states and 178 transitions. Second operand 176 states. [2018-12-03 16:56:00,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:56:00,020 INFO L93 Difference]: Finished difference Result 297 states and 299 transitions. [2018-12-03 16:56:00,020 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2018-12-03 16:56:00,020 INFO L78 Accepts]: Start accepts. Automaton has 176 states. Word has length 176 [2018-12-03 16:56:00,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:56:00,021 INFO L225 Difference]: With dead ends: 297 [2018-12-03 16:56:00,021 INFO L226 Difference]: Without dead ends: 178 [2018-12-03 16:56:00,022 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 525 GetRequests, 178 SyntacticMatches, 115 SemanticMatches, 232 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19722 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=12268, Invalid=42254, Unknown=0, NotChecked=0, Total=54522 [2018-12-03 16:56:00,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-12-03 16:56:00,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-12-03 16:56:00,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-12-03 16:56:00,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 179 transitions. [2018-12-03 16:56:00,085 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 179 transitions. Word has length 176 [2018-12-03 16:56:00,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:56:00,085 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 179 transitions. [2018-12-03 16:56:00,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has 176 states. [2018-12-03 16:56:00,085 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 179 transitions. [2018-12-03 16:56:00,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-12-03 16:56:00,086 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:56:00,086 INFO L402 BasicCegarLoop]: trace histogram [58, 58, 57, 1, 1, 1, 1] [2018-12-03 16:56:00,086 INFO L423 AbstractCegarLoop]: === Iteration 116 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:56:00,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:56:00,086 INFO L82 PathProgramCache]: Analyzing trace with hash 2063485121, now seen corresponding path program 114 times [2018-12-03 16:56:00,086 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:56:00,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:00,087 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:56:00,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:00,087 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:56:00,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:01,569 INFO L134 CoverageAnalysis]: Checked inductivity of 5017 backedges. 1711 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:01,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:01,569 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:56:01,569 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:56:01,569 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:56:01,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:01,570 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:56:01,578 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:56:01,578 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:56:01,723 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:56:01,723 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:56:01,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:56:01,835 INFO L134 CoverageAnalysis]: Checked inductivity of 5017 backedges. 1711 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:01,835 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:56:04,507 INFO L134 CoverageAnalysis]: Checked inductivity of 5017 backedges. 1711 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:04,527 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:56:04,527 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 61, 61] total 63 [2018-12-03 16:56:04,527 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:56:04,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-12-03 16:56:04,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-12-03 16:56:04,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1896, Invalid=2136, Unknown=0, NotChecked=0, Total=4032 [2018-12-03 16:56:04,528 INFO L87 Difference]: Start difference. First operand 178 states and 179 transitions. Second operand 64 states. [2018-12-03 16:56:06,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:56:06,218 INFO L93 Difference]: Finished difference Result 186 states and 187 transitions. [2018-12-03 16:56:06,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-12-03 16:56:06,219 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 177 [2018-12-03 16:56:06,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:56:06,219 INFO L225 Difference]: With dead ends: 186 [2018-12-03 16:56:06,220 INFO L226 Difference]: Without dead ends: 184 [2018-12-03 16:56:06,221 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 293 SyntacticMatches, 116 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7020 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=5614, Invalid=9392, Unknown=0, NotChecked=0, Total=15006 [2018-12-03 16:56:06,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-12-03 16:56:06,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 180. [2018-12-03 16:56:06,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-12-03 16:56:06,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 181 transitions. [2018-12-03 16:56:06,292 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 181 transitions. Word has length 177 [2018-12-03 16:56:06,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:56:06,292 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 181 transitions. [2018-12-03 16:56:06,292 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-12-03 16:56:06,292 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 181 transitions. [2018-12-03 16:56:06,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-12-03 16:56:06,293 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:56:06,293 INFO L402 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1] [2018-12-03 16:56:06,293 INFO L423 AbstractCegarLoop]: === Iteration 117 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:56:06,293 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:56:06,293 INFO L82 PathProgramCache]: Analyzing trace with hash -1265756259, now seen corresponding path program 115 times [2018-12-03 16:56:06,293 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:56:06,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:06,294 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:56:06,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:06,294 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:56:06,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:10,719 INFO L134 CoverageAnalysis]: Checked inductivity of 5133 backedges. 3422 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:10,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:10,719 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:56:10,719 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:56:10,720 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:56:10,720 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:10,720 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:56:10,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:56:10,733 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:56:10,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:10,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:56:16,390 INFO L134 CoverageAnalysis]: Checked inductivity of 5133 backedges. 3422 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:16,391 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:56:20,627 INFO L134 CoverageAnalysis]: Checked inductivity of 5133 backedges. 3422 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:20,647 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:56:20,647 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [119, 119, 119] total 178 [2018-12-03 16:56:20,647 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:56:20,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 179 states [2018-12-03 16:56:20,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 179 interpolants. [2018-12-03 16:56:20,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7258, Invalid=24604, Unknown=0, NotChecked=0, Total=31862 [2018-12-03 16:56:20,649 INFO L87 Difference]: Start difference. First operand 180 states and 181 transitions. Second operand 179 states. [2018-12-03 16:56:26,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:56:26,352 INFO L93 Difference]: Finished difference Result 302 states and 304 transitions. [2018-12-03 16:56:26,352 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2018-12-03 16:56:26,352 INFO L78 Accepts]: Start accepts. Automaton has 179 states. Word has length 179 [2018-12-03 16:56:26,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:56:26,352 INFO L225 Difference]: With dead ends: 302 [2018-12-03 16:56:26,352 INFO L226 Difference]: Without dead ends: 181 [2018-12-03 16:56:26,354 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 534 GetRequests, 181 SyntacticMatches, 117 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20416 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=12686, Invalid=43720, Unknown=0, NotChecked=0, Total=56406 [2018-12-03 16:56:26,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-12-03 16:56:26,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 181. [2018-12-03 16:56:26,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-12-03 16:56:26,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 182 transitions. [2018-12-03 16:56:26,425 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 182 transitions. Word has length 179 [2018-12-03 16:56:26,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:56:26,425 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 182 transitions. [2018-12-03 16:56:26,425 INFO L481 AbstractCegarLoop]: Interpolant automaton has 179 states. [2018-12-03 16:56:26,425 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 182 transitions. [2018-12-03 16:56:26,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2018-12-03 16:56:26,426 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:56:26,426 INFO L402 BasicCegarLoop]: trace histogram [59, 59, 58, 1, 1, 1, 1] [2018-12-03 16:56:26,426 INFO L423 AbstractCegarLoop]: === Iteration 118 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:56:26,426 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:56:26,426 INFO L82 PathProgramCache]: Analyzing trace with hash -1331794170, now seen corresponding path program 116 times [2018-12-03 16:56:26,426 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:56:26,427 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:26,427 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:56:26,427 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:26,427 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:56:26,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:28,265 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1770 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:28,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:28,265 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:56:28,266 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:56:28,266 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:56:28,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:28,266 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:56:28,275 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:56:28,275 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:56:28,593 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2018-12-03 16:56:28,593 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:56:28,599 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:56:28,708 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1770 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:28,708 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:56:31,244 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1770 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:31,264 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:56:31,265 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 64 [2018-12-03 16:56:31,265 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:56:31,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 16:56:31,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 16:56:31,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1958, Invalid=2202, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 16:56:31,266 INFO L87 Difference]: Start difference. First operand 181 states and 182 transitions. Second operand 65 states. [2018-12-03 16:56:33,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:56:33,142 INFO L93 Difference]: Finished difference Result 189 states and 190 transitions. [2018-12-03 16:56:33,142 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2018-12-03 16:56:33,142 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 180 [2018-12-03 16:56:33,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:56:33,143 INFO L225 Difference]: With dead ends: 189 [2018-12-03 16:56:33,143 INFO L226 Difference]: Without dead ends: 187 [2018-12-03 16:56:33,144 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 539 GetRequests, 298 SyntacticMatches, 118 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7259 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=5799, Invalid=9701, Unknown=0, NotChecked=0, Total=15500 [2018-12-03 16:56:33,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-12-03 16:56:33,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 183. [2018-12-03 16:56:33,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-12-03 16:56:33,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 184 transitions. [2018-12-03 16:56:33,209 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 184 transitions. Word has length 180 [2018-12-03 16:56:33,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:56:33,209 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 184 transitions. [2018-12-03 16:56:33,209 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 16:56:33,209 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 184 transitions. [2018-12-03 16:56:33,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-12-03 16:56:33,210 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:56:33,210 INFO L402 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1] [2018-12-03 16:56:33,210 INFO L423 AbstractCegarLoop]: === Iteration 119 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:56:33,210 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:56:33,210 INFO L82 PathProgramCache]: Analyzing trace with hash 45990050, now seen corresponding path program 117 times [2018-12-03 16:56:33,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:56:33,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:33,211 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:56:33,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:33,211 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:56:33,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:37,562 INFO L134 CoverageAnalysis]: Checked inductivity of 5310 backedges. 3540 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:37,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:37,563 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:56:37,563 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:56:37,563 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:56:37,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:37,563 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:56:37,592 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:56:37,593 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:56:37,739 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:56:37,739 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:56:37,750 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:56:43,633 INFO L134 CoverageAnalysis]: Checked inductivity of 5310 backedges. 3540 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:43,633 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:56:47,805 INFO L134 CoverageAnalysis]: Checked inductivity of 5310 backedges. 3540 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:47,824 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:56:47,825 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [121, 121, 121] total 181 [2018-12-03 16:56:47,825 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:56:47,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 182 states [2018-12-03 16:56:47,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 182 interpolants. [2018-12-03 16:56:47,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7501, Invalid=25441, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 16:56:47,827 INFO L87 Difference]: Start difference. First operand 183 states and 184 transitions. Second operand 182 states. [2018-12-03 16:56:53,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:56:53,093 INFO L93 Difference]: Finished difference Result 307 states and 309 transitions. [2018-12-03 16:56:53,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2018-12-03 16:56:53,093 INFO L78 Accepts]: Start accepts. Automaton has 182 states. Word has length 182 [2018-12-03 16:56:53,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:56:53,094 INFO L225 Difference]: With dead ends: 307 [2018-12-03 16:56:53,094 INFO L226 Difference]: Without dead ends: 184 [2018-12-03 16:56:53,096 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 543 GetRequests, 184 SyntacticMatches, 119 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21122 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=13111, Invalid=45211, Unknown=0, NotChecked=0, Total=58322 [2018-12-03 16:56:53,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-12-03 16:56:53,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 184. [2018-12-03 16:56:53,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-12-03 16:56:53,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 185 transitions. [2018-12-03 16:56:53,169 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 185 transitions. Word has length 182 [2018-12-03 16:56:53,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:56:53,169 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 185 transitions. [2018-12-03 16:56:53,170 INFO L481 AbstractCegarLoop]: Interpolant automaton has 182 states. [2018-12-03 16:56:53,170 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 185 transitions. [2018-12-03 16:56:53,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-12-03 16:56:53,170 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:56:53,170 INFO L402 BasicCegarLoop]: trace histogram [60, 60, 59, 1, 1, 1, 1] [2018-12-03 16:56:53,170 INFO L423 AbstractCegarLoop]: === Iteration 120 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:56:53,170 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:56:53,171 INFO L82 PathProgramCache]: Analyzing trace with hash -194394983, now seen corresponding path program 118 times [2018-12-03 16:56:53,171 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:56:53,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:53,171 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:56:53,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:53,171 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:56:53,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:54,947 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1830 proven. 3540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:54,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:54,947 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:56:54,947 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:56:54,948 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:56:54,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:54,948 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 119 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 119 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:56:54,956 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:56:54,956 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:56:55,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:55,101 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:56:55,180 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1830 proven. 3540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:55,180 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:56:57,861 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1830 proven. 3540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:57,880 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:56:57,880 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 63, 63] total 65 [2018-12-03 16:56:57,880 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:56:57,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-12-03 16:56:57,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-12-03 16:56:57,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2021, Invalid=2269, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 16:56:57,881 INFO L87 Difference]: Start difference. First operand 184 states and 185 transitions. Second operand 66 states. [2018-12-03 16:56:59,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:56:59,822 INFO L93 Difference]: Finished difference Result 192 states and 193 transitions. [2018-12-03 16:56:59,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2018-12-03 16:56:59,823 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 183 [2018-12-03 16:56:59,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:56:59,823 INFO L225 Difference]: With dead ends: 192 [2018-12-03 16:56:59,823 INFO L226 Difference]: Without dead ends: 190 [2018-12-03 16:56:59,825 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 303 SyntacticMatches, 120 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7502 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=5987, Invalid=10015, Unknown=0, NotChecked=0, Total=16002 [2018-12-03 16:56:59,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-12-03 16:56:59,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 186. [2018-12-03 16:56:59,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-12-03 16:56:59,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 187 transitions. [2018-12-03 16:56:59,900 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 187 transitions. Word has length 183 [2018-12-03 16:56:59,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:56:59,900 INFO L480 AbstractCegarLoop]: Abstraction has 186 states and 187 transitions. [2018-12-03 16:56:59,900 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-12-03 16:56:59,901 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 187 transitions. [2018-12-03 16:56:59,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-12-03 16:56:59,901 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:56:59,901 INFO L402 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1, 1, 1] [2018-12-03 16:56:59,901 INFO L423 AbstractCegarLoop]: === Iteration 121 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:56:59,901 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:56:59,901 INFO L82 PathProgramCache]: Analyzing trace with hash -2130051723, now seen corresponding path program 119 times [2018-12-03 16:56:59,902 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:56:59,902 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:59,902 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:56:59,902 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:59,902 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:56:59,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:57:04,749 INFO L134 CoverageAnalysis]: Checked inductivity of 5490 backedges. 3660 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:04,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:57:04,750 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:57:04,750 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:57:04,750 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:57:04,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:57:04,750 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:57:04,758 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:57:04,758 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:57:05,092 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 61 check-sat command(s) [2018-12-03 16:57:05,092 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:57:05,100 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:57:10,940 INFO L134 CoverageAnalysis]: Checked inductivity of 5490 backedges. 3660 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:10,940 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:57:15,456 INFO L134 CoverageAnalysis]: Checked inductivity of 5490 backedges. 3660 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:15,476 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:57:15,477 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [123, 123, 123] total 184 [2018-12-03 16:57:15,477 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:57:15,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 185 states [2018-12-03 16:57:15,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 185 interpolants. [2018-12-03 16:57:15,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7748, Invalid=26292, Unknown=0, NotChecked=0, Total=34040 [2018-12-03 16:57:15,479 INFO L87 Difference]: Start difference. First operand 186 states and 187 transitions. Second operand 185 states. [2018-12-03 16:57:21,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:57:21,650 INFO L93 Difference]: Finished difference Result 312 states and 314 transitions. [2018-12-03 16:57:21,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2018-12-03 16:57:21,651 INFO L78 Accepts]: Start accepts. Automaton has 185 states. Word has length 185 [2018-12-03 16:57:21,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:57:21,651 INFO L225 Difference]: With dead ends: 312 [2018-12-03 16:57:21,651 INFO L226 Difference]: Without dead ends: 187 [2018-12-03 16:57:21,653 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 187 SyntacticMatches, 121 SemanticMatches, 244 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21840 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=13543, Invalid=46727, Unknown=0, NotChecked=0, Total=60270 [2018-12-03 16:57:21,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-12-03 16:57:21,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-12-03 16:57:21,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-12-03 16:57:21,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-12-03 16:57:21,743 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 185 [2018-12-03 16:57:21,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:57:21,743 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-12-03 16:57:21,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has 185 states. [2018-12-03 16:57:21,743 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-12-03 16:57:21,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-12-03 16:57:21,743 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:57:21,743 INFO L402 BasicCegarLoop]: trace histogram [61, 61, 60, 1, 1, 1, 1] [2018-12-03 16:57:21,744 INFO L423 AbstractCegarLoop]: === Iteration 122 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:57:21,744 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:57:21,744 INFO L82 PathProgramCache]: Analyzing trace with hash 564879902, now seen corresponding path program 120 times [2018-12-03 16:57:21,744 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:57:21,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:57:21,744 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:57:21,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:57:21,745 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:57:21,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:57:23,387 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1891 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:23,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:57:23,387 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:57:23,387 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:57:23,387 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:57:23,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:57:23,387 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 121 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 121 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:57:23,396 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:57:23,396 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:57:23,580 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:57:23,580 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:57:23,590 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:57:23,701 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1891 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:23,701 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:57:26,653 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1891 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:26,673 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:57:26,673 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 64, 64] total 66 [2018-12-03 16:57:26,673 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:57:26,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-12-03 16:57:26,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-12-03 16:57:26,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2085, Invalid=2337, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 16:57:26,674 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 67 states. [2018-12-03 16:57:28,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:57:28,499 INFO L93 Difference]: Finished difference Result 195 states and 196 transitions. [2018-12-03 16:57:28,500 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2018-12-03 16:57:28,500 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 186 [2018-12-03 16:57:28,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:57:28,501 INFO L225 Difference]: With dead ends: 195 [2018-12-03 16:57:28,501 INFO L226 Difference]: Without dead ends: 193 [2018-12-03 16:57:28,502 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 557 GetRequests, 308 SyntacticMatches, 122 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7749 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=6178, Invalid=10334, Unknown=0, NotChecked=0, Total=16512 [2018-12-03 16:57:28,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-12-03 16:57:28,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 189. [2018-12-03 16:57:28,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-12-03 16:57:28,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 190 transitions. [2018-12-03 16:57:28,581 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 190 transitions. Word has length 186 [2018-12-03 16:57:28,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:57:28,581 INFO L480 AbstractCegarLoop]: Abstraction has 189 states and 190 transitions. [2018-12-03 16:57:28,581 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-12-03 16:57:28,581 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 190 transitions. [2018-12-03 16:57:28,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-12-03 16:57:28,582 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:57:28,582 INFO L402 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1] [2018-12-03 16:57:28,582 INFO L423 AbstractCegarLoop]: === Iteration 123 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:57:28,582 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:57:28,582 INFO L82 PathProgramCache]: Analyzing trace with hash 1683639738, now seen corresponding path program 121 times [2018-12-03 16:57:28,582 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:57:28,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:57:28,583 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:57:28,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:57:28,583 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:57:28,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:57:33,510 INFO L134 CoverageAnalysis]: Checked inductivity of 5673 backedges. 3782 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:33,510 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:57:33,511 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:57:33,511 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:57:33,511 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:57:33,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:57:33,511 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:57:33,520 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:57:33,520 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:57:33,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:57:33,666 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:57:40,064 INFO L134 CoverageAnalysis]: Checked inductivity of 5673 backedges. 3782 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:40,064 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:57:44,782 INFO L134 CoverageAnalysis]: Checked inductivity of 5673 backedges. 3782 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:44,801 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:57:44,802 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [125, 125, 125] total 187 [2018-12-03 16:57:44,802 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:57:44,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 188 states [2018-12-03 16:57:44,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2018-12-03 16:57:44,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7999, Invalid=27157, Unknown=0, NotChecked=0, Total=35156 [2018-12-03 16:57:44,804 INFO L87 Difference]: Start difference. First operand 189 states and 190 transitions. Second operand 188 states. [2018-12-03 16:57:51,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:57:51,336 INFO L93 Difference]: Finished difference Result 317 states and 319 transitions. [2018-12-03 16:57:51,336 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2018-12-03 16:57:51,337 INFO L78 Accepts]: Start accepts. Automaton has 188 states. Word has length 188 [2018-12-03 16:57:51,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:57:51,337 INFO L225 Difference]: With dead ends: 317 [2018-12-03 16:57:51,337 INFO L226 Difference]: Without dead ends: 190 [2018-12-03 16:57:51,338 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 561 GetRequests, 190 SyntacticMatches, 123 SemanticMatches, 248 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22570 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=13982, Invalid=48268, Unknown=0, NotChecked=0, Total=62250 [2018-12-03 16:57:51,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-12-03 16:57:51,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 190. [2018-12-03 16:57:51,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-12-03 16:57:51,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2018-12-03 16:57:51,416 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 188 [2018-12-03 16:57:51,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:57:51,416 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2018-12-03 16:57:51,416 INFO L481 AbstractCegarLoop]: Interpolant automaton has 188 states. [2018-12-03 16:57:51,416 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2018-12-03 16:57:51,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-12-03 16:57:51,417 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:57:51,417 INFO L402 BasicCegarLoop]: trace histogram [62, 62, 61, 1, 1, 1, 1] [2018-12-03 16:57:51,417 INFO L423 AbstractCegarLoop]: === Iteration 124 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:57:51,417 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:57:51,417 INFO L82 PathProgramCache]: Analyzing trace with hash 568015985, now seen corresponding path program 122 times [2018-12-03 16:57:51,418 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:57:51,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:57:51,418 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:57:51,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:57:51,418 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:57:51,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:57:53,124 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 1953 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:53,124 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:57:53,124 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:57:53,124 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:57:53,124 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:57:53,124 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:57:53,125 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 123 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 123 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:57:53,132 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:57:53,133 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:57:53,479 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 62 check-sat command(s) [2018-12-03 16:57:53,479 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:57:53,486 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:57:53,630 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 1953 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:53,630 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:57:56,685 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 1953 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:56,704 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:57:56,704 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 65, 65] total 67 [2018-12-03 16:57:56,704 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:57:56,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-12-03 16:57:56,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-12-03 16:57:56,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2150, Invalid=2406, Unknown=0, NotChecked=0, Total=4556 [2018-12-03 16:57:56,706 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand 68 states. [2018-12-03 16:57:58,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:57:58,618 INFO L93 Difference]: Finished difference Result 198 states and 199 transitions. [2018-12-03 16:57:58,618 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 129 states. [2018-12-03 16:57:58,618 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 189 [2018-12-03 16:57:58,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:57:58,619 INFO L225 Difference]: With dead ends: 198 [2018-12-03 16:57:58,619 INFO L226 Difference]: Without dead ends: 196 [2018-12-03 16:57:58,620 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 566 GetRequests, 313 SyntacticMatches, 124 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8000 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=6372, Invalid=10658, Unknown=0, NotChecked=0, Total=17030 [2018-12-03 16:57:58,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-12-03 16:57:58,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 192. [2018-12-03 16:57:58,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-12-03 16:57:58,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 193 transitions. [2018-12-03 16:57:58,703 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 193 transitions. Word has length 189 [2018-12-03 16:57:58,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:57:58,703 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 193 transitions. [2018-12-03 16:57:58,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-12-03 16:57:58,703 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 193 transitions. [2018-12-03 16:57:58,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-12-03 16:57:58,704 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:57:58,704 INFO L402 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1, 1, 1] [2018-12-03 16:57:58,704 INFO L423 AbstractCegarLoop]: === Iteration 125 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:57:58,704 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:57:58,705 INFO L82 PathProgramCache]: Analyzing trace with hash 402448205, now seen corresponding path program 123 times [2018-12-03 16:57:58,705 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:57:58,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:57:58,705 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:57:58,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:57:58,706 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:57:58,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:58:03,720 INFO L134 CoverageAnalysis]: Checked inductivity of 5859 backedges. 3906 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:58:03,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:58:03,721 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:58:03,721 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:58:03,721 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:58:03,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:58:03,721 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:58:03,729 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:58:03,729 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:58:03,885 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:58:03,886 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:58:03,896 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:58:09,987 INFO L134 CoverageAnalysis]: Checked inductivity of 5859 backedges. 3906 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:58:09,987 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:58:14,744 INFO L134 CoverageAnalysis]: Checked inductivity of 5859 backedges. 3906 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:58:14,763 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:58:14,763 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [127, 127, 127] total 190 [2018-12-03 16:58:14,763 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:58:14,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 191 states [2018-12-03 16:58:14,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 191 interpolants. [2018-12-03 16:58:14,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8254, Invalid=28036, Unknown=0, NotChecked=0, Total=36290 [2018-12-03 16:58:14,765 INFO L87 Difference]: Start difference. First operand 192 states and 193 transitions. Second operand 191 states. [2018-12-03 16:58:21,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:58:21,576 INFO L93 Difference]: Finished difference Result 322 states and 324 transitions. [2018-12-03 16:58:21,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2018-12-03 16:58:21,576 INFO L78 Accepts]: Start accepts. Automaton has 191 states. Word has length 191 [2018-12-03 16:58:21,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:58:21,577 INFO L225 Difference]: With dead ends: 322 [2018-12-03 16:58:21,577 INFO L226 Difference]: Without dead ends: 193 [2018-12-03 16:58:21,579 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 193 SyntacticMatches, 125 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23312 ImplicationChecksByTransitivity, 18.9s TimeCoverageRelationStatistics Valid=14428, Invalid=49834, Unknown=0, NotChecked=0, Total=64262 [2018-12-03 16:58:21,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-12-03 16:58:21,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 193. [2018-12-03 16:58:21,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2018-12-03 16:58:21,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 194 transitions. [2018-12-03 16:58:21,655 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 194 transitions. Word has length 191 [2018-12-03 16:58:21,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:58:21,655 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 194 transitions. [2018-12-03 16:58:21,655 INFO L481 AbstractCegarLoop]: Interpolant automaton has 191 states. [2018-12-03 16:58:21,655 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 194 transitions. [2018-12-03 16:58:21,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2018-12-03 16:58:21,656 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:58:21,656 INFO L402 BasicCegarLoop]: trace histogram [63, 63, 62, 1, 1, 1, 1] [2018-12-03 16:58:21,656 INFO L423 AbstractCegarLoop]: === Iteration 126 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:58:21,656 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:58:21,657 INFO L82 PathProgramCache]: Analyzing trace with hash -687840970, now seen corresponding path program 124 times [2018-12-03 16:58:21,657 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:58:21,657 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:58:21,657 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:58:21,657 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:58:21,657 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:58:21,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:58:23,449 INFO L134 CoverageAnalysis]: Checked inductivity of 5922 backedges. 2016 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:58:23,449 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:58:23,450 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:58:23,450 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:58:23,450 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:58:23,450 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:58:23,450 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 125 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 125 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:58:23,459 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:58:23,459 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:58:23,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:58:23,615 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:58:23,705 INFO L134 CoverageAnalysis]: Checked inductivity of 5922 backedges. 2016 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:58:23,706 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:58:26,912 INFO L134 CoverageAnalysis]: Checked inductivity of 5922 backedges. 2016 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:58:26,931 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:58:26,931 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66, 66] total 68 [2018-12-03 16:58:26,932 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:58:26,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-12-03 16:58:26,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-12-03 16:58:26,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2216, Invalid=2476, Unknown=0, NotChecked=0, Total=4692 [2018-12-03 16:58:26,933 INFO L87 Difference]: Start difference. First operand 193 states and 194 transitions. Second operand 69 states. [2018-12-03 16:58:28,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:58:28,933 INFO L93 Difference]: Finished difference Result 201 states and 202 transitions. [2018-12-03 16:58:28,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2018-12-03 16:58:28,933 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 192 [2018-12-03 16:58:28,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:58:28,934 INFO L225 Difference]: With dead ends: 201 [2018-12-03 16:58:28,934 INFO L226 Difference]: Without dead ends: 199 [2018-12-03 16:58:28,935 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 575 GetRequests, 318 SyntacticMatches, 126 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8255 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=6569, Invalid=10987, Unknown=0, NotChecked=0, Total=17556 [2018-12-03 16:58:28,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-12-03 16:58:29,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 195. [2018-12-03 16:58:29,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-12-03 16:58:29,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 196 transitions. [2018-12-03 16:58:29,019 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 196 transitions. Word has length 192 [2018-12-03 16:58:29,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:58:29,020 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 196 transitions. [2018-12-03 16:58:29,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-12-03 16:58:29,020 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 196 transitions. [2018-12-03 16:58:29,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-12-03 16:58:29,021 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:58:29,021 INFO L402 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1, 1, 1] [2018-12-03 16:58:29,021 INFO L423 AbstractCegarLoop]: === Iteration 127 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:58:29,021 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:58:29,021 INFO L82 PathProgramCache]: Analyzing trace with hash 409724626, now seen corresponding path program 125 times [2018-12-03 16:58:29,021 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:58:29,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:58:29,022 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:58:29,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:58:29,022 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:58:29,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:58:34,260 INFO L134 CoverageAnalysis]: Checked inductivity of 6048 backedges. 4032 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:58:34,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:58:34,261 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:58:34,261 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:58:34,261 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:58:34,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:58:34,261 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:58:34,272 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:58:34,272 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:58:34,632 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 64 check-sat command(s) [2018-12-03 16:58:34,632 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:58:34,640 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:58:41,196 INFO L134 CoverageAnalysis]: Checked inductivity of 6048 backedges. 4032 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:58:41,196 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:58:46,217 INFO L134 CoverageAnalysis]: Checked inductivity of 6048 backedges. 4032 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:58:46,236 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:58:46,237 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [129, 129, 129] total 193 [2018-12-03 16:58:46,237 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:58:46,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2018-12-03 16:58:46,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2018-12-03 16:58:46,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8513, Invalid=28929, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 16:58:46,239 INFO L87 Difference]: Start difference. First operand 195 states and 196 transitions. Second operand 194 states. [2018-12-03 16:58:52,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:58:52,974 INFO L93 Difference]: Finished difference Result 327 states and 329 transitions. [2018-12-03 16:58:52,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2018-12-03 16:58:52,975 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 194 [2018-12-03 16:58:52,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:58:52,975 INFO L225 Difference]: With dead ends: 327 [2018-12-03 16:58:52,975 INFO L226 Difference]: Without dead ends: 196 [2018-12-03 16:58:52,976 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 579 GetRequests, 196 SyntacticMatches, 127 SemanticMatches, 256 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24066 ImplicationChecksByTransitivity, 19.7s TimeCoverageRelationStatistics Valid=14881, Invalid=51425, Unknown=0, NotChecked=0, Total=66306 [2018-12-03 16:58:52,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-12-03 16:58:53,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2018-12-03 16:58:53,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-12-03 16:58:53,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 197 transitions. [2018-12-03 16:58:53,059 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 197 transitions. Word has length 194 [2018-12-03 16:58:53,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:58:53,059 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 197 transitions. [2018-12-03 16:58:53,059 INFO L481 AbstractCegarLoop]: Interpolant automaton has 194 states. [2018-12-03 16:58:53,059 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 197 transitions. [2018-12-03 16:58:53,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-12-03 16:58:53,060 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:58:53,060 INFO L402 BasicCegarLoop]: trace histogram [64, 64, 63, 1, 1, 1, 1] [2018-12-03 16:58:53,062 INFO L423 AbstractCegarLoop]: === Iteration 128 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:58:53,062 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:58:53,062 INFO L82 PathProgramCache]: Analyzing trace with hash -1852395447, now seen corresponding path program 126 times [2018-12-03 16:58:53,062 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:58:53,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:58:53,063 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:58:53,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:58:53,063 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:58:53,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:58:54,926 INFO L134 CoverageAnalysis]: Checked inductivity of 6112 backedges. 2080 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:58:54,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:58:54,927 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:58:54,927 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:58:54,927 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:58:54,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:58:54,927 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 127 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 127 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:58:54,935 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:58:54,936 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:58:55,104 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:58:55,104 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:58:55,116 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:58:55,274 INFO L134 CoverageAnalysis]: Checked inductivity of 6112 backedges. 2080 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:58:55,274 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:58:58,579 INFO L134 CoverageAnalysis]: Checked inductivity of 6112 backedges. 2016 proven. 4096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:58:58,598 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:58:58,598 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 72 [2018-12-03 16:58:58,598 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:58:58,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 16:58:58,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 16:58:58,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2363, Invalid=2893, Unknown=0, NotChecked=0, Total=5256 [2018-12-03 16:58:58,600 INFO L87 Difference]: Start difference. First operand 196 states and 197 transitions. Second operand 71 states. [2018-12-03 16:59:00,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:59:00,946 INFO L93 Difference]: Finished difference Result 204 states and 205 transitions. [2018-12-03 16:59:00,946 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2018-12-03 16:59:00,946 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 195 [2018-12-03 16:59:00,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:59:00,947 INFO L225 Difference]: With dead ends: 204 [2018-12-03 16:59:00,947 INFO L226 Difference]: Without dead ends: 202 [2018-12-03 16:59:00,948 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 583 GetRequests, 321 SyntacticMatches, 127 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8779 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=6779, Invalid=11853, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 16:59:00,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-12-03 16:59:01,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 198. [2018-12-03 16:59:01,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-12-03 16:59:01,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 199 transitions. [2018-12-03 16:59:01,043 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 199 transitions. Word has length 195 [2018-12-03 16:59:01,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:59:01,044 INFO L480 AbstractCegarLoop]: Abstraction has 198 states and 199 transitions. [2018-12-03 16:59:01,044 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 16:59:01,044 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 199 transitions. [2018-12-03 16:59:01,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-12-03 16:59:01,045 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:59:01,045 INFO L402 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1] [2018-12-03 16:59:01,045 INFO L423 AbstractCegarLoop]: === Iteration 129 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:59:01,045 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:59:01,045 INFO L82 PathProgramCache]: Analyzing trace with hash -2035630811, now seen corresponding path program 127 times [2018-12-03 16:59:01,045 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:59:01,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:59:01,046 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:59:01,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:59:01,046 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:59:01,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat