java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/NeonAngel01.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-133090d [2018-10-04 09:27:35,802 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-04 09:27:35,804 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-04 09:27:35,815 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-04 09:27:35,816 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-04 09:27:35,817 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-04 09:27:35,818 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-04 09:27:35,820 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-04 09:27:35,822 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-04 09:27:35,822 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-04 09:27:35,823 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-04 09:27:35,824 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-04 09:27:35,825 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-04 09:27:35,826 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-04 09:27:35,827 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-04 09:27:35,827 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-04 09:27:35,828 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-04 09:27:35,830 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-04 09:27:35,832 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-04 09:27:35,834 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-04 09:27:35,835 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-04 09:27:35,836 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-04 09:27:35,839 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-04 09:27:35,847 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf [2018-10-04 09:27:35,862 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-04 09:27:35,862 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-04 09:27:35,863 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-04 09:27:35,863 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-04 09:27:35,864 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-04 09:27:35,864 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-04 09:27:35,864 INFO L133 SettingsManager]: * Use SBE=true [2018-10-04 09:27:35,865 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-04 09:27:35,865 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-04 09:27:35,865 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-04 09:27:35,865 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-04 09:27:35,865 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-04 09:27:35,866 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-04 09:27:35,866 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-04 09:27:35,866 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-04 09:27:35,866 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-04 09:27:35,866 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-04 09:27:35,867 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-04 09:27:35,867 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-04 09:27:35,867 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-04 09:27:35,867 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-04 09:27:35,867 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-04 09:27:35,868 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-04 09:27:35,868 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-04 09:27:35,868 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-04 09:27:35,868 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-04 09:27:35,868 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-04 09:27:35,869 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-04 09:27:35,869 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-04 09:27:35,869 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-04 09:27:35,913 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-04 09:27:35,931 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-04 09:27:35,937 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-04 09:27:35,939 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-10-04 09:27:35,939 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-10-04 09:27:35,940 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/NeonAngel01.bpl [2018-10-04 09:27:35,940 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/NeonAngel01.bpl' [2018-10-04 09:27:35,992 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-04 09:27:35,994 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-10-04 09:27:35,994 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-04 09:27:35,995 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-04 09:27:35,995 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-04 09:27:36,020 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:27:35" (1/1) ... [2018-10-04 09:27:36,033 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:27:35" (1/1) ... [2018-10-04 09:27:36,038 WARN L165 Inliner]: Program contained no entry procedure! [2018-10-04 09:27:36,038 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2018-10-04 09:27:36,038 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2018-10-04 09:27:36,040 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-04 09:27:36,041 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-04 09:27:36,042 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-04 09:27:36,042 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-04 09:27:36,053 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:27:35" (1/1) ... [2018-10-04 09:27:36,054 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:27:35" (1/1) ... [2018-10-04 09:27:36,054 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:27:35" (1/1) ... [2018-10-04 09:27:36,055 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:27:35" (1/1) ... [2018-10-04 09:27:36,059 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:27:35" (1/1) ... [2018-10-04 09:27:36,064 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:27:35" (1/1) ... [2018-10-04 09:27:36,066 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:27:35" (1/1) ... [2018-10-04 09:27:36,067 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-04 09:27:36,069 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-04 09:27:36,069 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-04 09:27:36,069 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-04 09:27:36,070 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:27:35" (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 [2018-10-04 09:27:36,151 INFO L124 BoogieDeclarations]: Specification and implementation of procedure main given in one single declaration [2018-10-04 09:27:36,151 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-04 09:27:36,151 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-04 09:27:36,375 INFO L338 CfgBuilder]: Using library mode [2018-10-04 09:27:36,375 INFO L202 PluginConnector]: Adding new model NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.10 09:27:36 BoogieIcfgContainer [2018-10-04 09:27:36,375 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-04 09:27:36,377 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-04 09:27:36,377 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-04 09:27:36,382 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-04 09:27:36,382 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:27:35" (1/2) ... [2018-10-04 09:27:36,383 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a8b70d8 and model type NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.10 09:27:36, skipping insertion in model container [2018-10-04 09:27:36,384 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.10 09:27:36" (2/2) ... [2018-10-04 09:27:36,385 INFO L112 eAbstractionObserver]: Analyzing ICFG NeonAngel01.bpl [2018-10-04 09:27:36,396 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-04 09:27:36,404 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-04 09:27:36,450 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-04 09:27:36,451 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-10-04 09:27:36,451 INFO L382 AbstractCegarLoop]: Hoare is true [2018-10-04 09:27:36,451 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-04 09:27:36,452 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-04 09:27:36,452 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-04 09:27:36,452 INFO L386 AbstractCegarLoop]: Difference is false [2018-10-04 09:27:36,452 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-04 09:27:36,452 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-04 09:27:36,468 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-10-04 09:27:36,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-10-04 09:27:36,478 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:36,483 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-10-04 09:27:36,485 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:36,493 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:36,493 INFO L82 PathProgramCache]: Analyzing trace with hash 30048, now seen corresponding path program 1 times [2018-10-04 09:27:36,496 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:36,496 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:36,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:36,560 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:27:36,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:36,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:36,649 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:36,651 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-04 09:27:36,652 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-04 09:27:36,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-04 09:27:36,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-04 09:27:36,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-04 09:27:36,669 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-10-04 09:27:36,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:36,707 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2018-10-04 09:27:36,708 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-04 09:27:36,709 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-10-04 09:27:36,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:36,729 INFO L225 Difference]: With dead ends: 13 [2018-10-04 09:27:36,729 INFO L226 Difference]: Without dead ends: 5 [2018-10-04 09:27:36,736 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-04 09:27:36,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-10-04 09:27:36,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-10-04 09:27:36,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-10-04 09:27:36,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 5 transitions. [2018-10-04 09:27:36,781 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 5 transitions. Word has length 3 [2018-10-04 09:27:36,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:36,781 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 5 transitions. [2018-10-04 09:27:36,781 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-04 09:27:36,781 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-10-04 09:27:36,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-10-04 09:27:36,782 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:36,782 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-10-04 09:27:36,782 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:36,782 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:36,783 INFO L82 PathProgramCache]: Analyzing trace with hash 927622, now seen corresponding path program 1 times [2018-10-04 09:27:36,783 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:36,783 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:36,784 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:36,784 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:27:36,784 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:36,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:36,919 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:36,919 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:36,919 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:36,945 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:27:36,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:36,965 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:36,983 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:37,017 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:37,017 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-10-04 09:27:37,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-04 09:27:37,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-04 09:27:37,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-04 09:27:37,019 INFO L87 Difference]: Start difference. First operand 5 states and 5 transitions. Second operand 4 states. [2018-10-04 09:27:37,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:37,099 INFO L93 Difference]: Finished difference Result 8 states and 8 transitions. [2018-10-04 09:27:37,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-04 09:27:37,100 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2018-10-04 09:27:37,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:37,101 INFO L225 Difference]: With dead ends: 8 [2018-10-04 09:27:37,101 INFO L226 Difference]: Without dead ends: 6 [2018-10-04 09:27:37,102 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-04 09:27:37,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2018-10-04 09:27:37,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2018-10-04 09:27:37,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-10-04 09:27:37,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2018-10-04 09:27:37,105 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2018-10-04 09:27:37,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:37,105 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2018-10-04 09:27:37,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-04 09:27:37,106 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2018-10-04 09:27:37,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-10-04 09:27:37,106 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:37,106 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2018-10-04 09:27:37,106 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:37,107 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:37,107 INFO L82 PathProgramCache]: Analyzing trace with hash 28752416, now seen corresponding path program 2 times [2018-10-04 09:27:37,107 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:37,107 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:37,108 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:37,108 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:27:37,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:37,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:37,210 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:37,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:37,211 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:37,219 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 09:27:37,230 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 09:27:37,231 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:27:37,233 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:37,238 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:37,258 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:37,259 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-04 09:27:37,259 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-04 09:27:37,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-04 09:27:37,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-10-04 09:27:37,260 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 5 states. [2018-10-04 09:27:37,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:37,325 INFO L93 Difference]: Finished difference Result 9 states and 9 transitions. [2018-10-04 09:27:37,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-04 09:27:37,326 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2018-10-04 09:27:37,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:37,326 INFO L225 Difference]: With dead ends: 9 [2018-10-04 09:27:37,326 INFO L226 Difference]: Without dead ends: 7 [2018-10-04 09:27:37,327 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-10-04 09:27:37,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-10-04 09:27:37,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-10-04 09:27:37,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-10-04 09:27:37,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-10-04 09:27:37,330 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 5 [2018-10-04 09:27:37,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:37,330 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-10-04 09:27:37,331 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-04 09:27:37,331 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-10-04 09:27:37,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-04 09:27:37,331 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:37,332 INFO L375 BasicCegarLoop]: trace histogram [3, 1, 1, 1] [2018-10-04 09:27:37,332 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:37,332 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:37,332 INFO L82 PathProgramCache]: Analyzing trace with hash 891321030, now seen corresponding path program 3 times [2018-10-04 09:27:37,333 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:37,333 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:37,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:37,334 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:27:37,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:37,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:37,426 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:37,426 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:37,427 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:37,439 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-04 09:27:37,453 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-04 09:27:37,453 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:27:37,454 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:37,465 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:37,487 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:37,488 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-04 09:27:37,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-04 09:27:37,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-04 09:27:37,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-04 09:27:37,489 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 6 states. [2018-10-04 09:27:37,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:37,545 INFO L93 Difference]: Finished difference Result 10 states and 10 transitions. [2018-10-04 09:27:37,545 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-04 09:27:37,546 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2018-10-04 09:27:37,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:37,546 INFO L225 Difference]: With dead ends: 10 [2018-10-04 09:27:37,546 INFO L226 Difference]: Without dead ends: 8 [2018-10-04 09:27:37,547 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-04 09:27:37,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-10-04 09:27:37,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-10-04 09:27:37,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-10-04 09:27:37,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-10-04 09:27:37,550 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-10-04 09:27:37,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:37,550 INFO L480 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-10-04 09:27:37,550 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-04 09:27:37,550 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-10-04 09:27:37,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-04 09:27:37,551 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:37,551 INFO L375 BasicCegarLoop]: trace histogram [4, 1, 1, 1] [2018-10-04 09:27:37,551 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:37,551 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:37,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1861144288, now seen corresponding path program 4 times [2018-10-04 09:27:37,552 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:37,552 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:37,553 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:37,553 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:27:37,553 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:37,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:37,810 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:37,811 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:37,811 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:37,825 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-04 09:27:37,859 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-04 09:27:37,859 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:27:37,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:37,868 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:37,896 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:37,896 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-04 09:27:37,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-04 09:27:37,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-04 09:27:37,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-04 09:27:37,897 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 7 states. [2018-10-04 09:27:37,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:37,933 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-10-04 09:27:37,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-04 09:27:37,934 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2018-10-04 09:27:37,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:37,935 INFO L225 Difference]: With dead ends: 11 [2018-10-04 09:27:37,935 INFO L226 Difference]: Without dead ends: 9 [2018-10-04 09:27:37,936 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-04 09:27:37,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-10-04 09:27:37,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-10-04 09:27:37,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-04 09:27:37,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-10-04 09:27:37,940 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2018-10-04 09:27:37,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:37,941 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-10-04 09:27:37,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-04 09:27:37,941 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-10-04 09:27:37,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-10-04 09:27:37,942 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:37,942 INFO L375 BasicCegarLoop]: trace histogram [5, 1, 1, 1] [2018-10-04 09:27:37,942 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:37,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:37,942 INFO L82 PathProgramCache]: Analyzing trace with hash 1860894214, now seen corresponding path program 5 times [2018-10-04 09:27:37,943 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:37,943 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:37,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:37,944 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:27:37,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:37,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:38,114 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:38,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:38,116 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:38,130 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-04 09:27:38,162 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2018-10-04 09:27:38,163 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:27:38,164 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:38,178 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:38,213 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:38,213 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-04 09:27:38,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-04 09:27:38,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-04 09:27:38,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-04 09:27:38,214 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 8 states. [2018-10-04 09:27:38,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:38,255 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2018-10-04 09:27:38,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-04 09:27:38,256 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 8 [2018-10-04 09:27:38,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:38,256 INFO L225 Difference]: With dead ends: 12 [2018-10-04 09:27:38,256 INFO L226 Difference]: Without dead ends: 10 [2018-10-04 09:27:38,257 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-04 09:27:38,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-10-04 09:27:38,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-10-04 09:27:38,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-10-04 09:27:38,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-10-04 09:27:38,260 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2018-10-04 09:27:38,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:38,260 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-10-04 09:27:38,260 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-04 09:27:38,260 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-10-04 09:27:38,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-10-04 09:27:38,261 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:38,261 INFO L375 BasicCegarLoop]: trace histogram [6, 1, 1, 1] [2018-10-04 09:27:38,261 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:38,261 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:38,262 INFO L82 PathProgramCache]: Analyzing trace with hash 1853141920, now seen corresponding path program 6 times [2018-10-04 09:27:38,262 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:38,262 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:38,263 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:38,263 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:27:38,263 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:38,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:38,465 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:38,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:38,466 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:38,474 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-04 09:27:38,488 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2018-10-04 09:27:38,488 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:27:38,489 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:38,504 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:38,525 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:38,525 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-04 09:27:38,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-04 09:27:38,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-04 09:27:38,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-04 09:27:38,527 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 9 states. [2018-10-04 09:27:38,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:38,554 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-10-04 09:27:38,555 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-04 09:27:38,555 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 9 [2018-10-04 09:27:38,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:38,556 INFO L225 Difference]: With dead ends: 13 [2018-10-04 09:27:38,556 INFO L226 Difference]: Without dead ends: 11 [2018-10-04 09:27:38,557 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-04 09:27:38,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-10-04 09:27:38,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-10-04 09:27:38,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-10-04 09:27:38,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-10-04 09:27:38,561 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2018-10-04 09:27:38,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:38,561 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-10-04 09:27:38,561 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-04 09:27:38,562 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-10-04 09:27:38,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-04 09:27:38,562 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:38,562 INFO L375 BasicCegarLoop]: trace histogram [7, 1, 1, 1] [2018-10-04 09:27:38,563 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:38,563 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:38,563 INFO L82 PathProgramCache]: Analyzing trace with hash 1612820806, now seen corresponding path program 7 times [2018-10-04 09:27:38,563 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:38,563 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:38,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:38,564 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:27:38,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:38,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:38,710 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:38,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:38,710 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:38,722 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:27:38,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:38,745 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:38,752 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:38,781 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:38,781 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-04 09:27:38,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-04 09:27:38,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-04 09:27:38,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-04 09:27:38,783 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 10 states. [2018-10-04 09:27:38,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:38,845 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-10-04 09:27:38,846 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-04 09:27:38,846 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 10 [2018-10-04 09:27:38,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:38,847 INFO L225 Difference]: With dead ends: 14 [2018-10-04 09:27:38,847 INFO L226 Difference]: Without dead ends: 12 [2018-10-04 09:27:38,848 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-04 09:27:38,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-04 09:27:38,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-04 09:27:38,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-04 09:27:38,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-04 09:27:38,851 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-10-04 09:27:38,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:38,851 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-04 09:27:38,851 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-04 09:27:38,852 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-04 09:27:38,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-04 09:27:38,852 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:38,852 INFO L375 BasicCegarLoop]: trace histogram [8, 1, 1, 1] [2018-10-04 09:27:38,852 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:38,853 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:38,853 INFO L82 PathProgramCache]: Analyzing trace with hash -1542166432, now seen corresponding path program 8 times [2018-10-04 09:27:38,853 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:38,853 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:38,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:38,854 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:27:38,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:38,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:39,364 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:39,364 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:39,364 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:39,374 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 09:27:39,384 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 09:27:39,384 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:27:39,385 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:39,393 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:39,416 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:39,416 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-04 09:27:39,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-04 09:27:39,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-04 09:27:39,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-04 09:27:39,418 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 11 states. [2018-10-04 09:27:39,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:39,457 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-10-04 09:27:39,460 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-04 09:27:39,460 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 11 [2018-10-04 09:27:39,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:39,461 INFO L225 Difference]: With dead ends: 15 [2018-10-04 09:27:39,461 INFO L226 Difference]: Without dead ends: 13 [2018-10-04 09:27:39,461 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-04 09:27:39,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-04 09:27:39,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-04 09:27:39,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-04 09:27:39,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-04 09:27:39,464 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2018-10-04 09:27:39,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:39,464 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-04 09:27:39,464 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-04 09:27:39,465 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-04 09:27:39,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-04 09:27:39,465 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:39,465 INFO L375 BasicCegarLoop]: trace histogram [9, 1, 1, 1] [2018-10-04 09:27:39,466 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:39,466 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:39,466 INFO L82 PathProgramCache]: Analyzing trace with hash -562523002, now seen corresponding path program 9 times [2018-10-04 09:27:39,466 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:39,466 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:39,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:39,467 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:27:39,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:39,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:39,664 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:39,665 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:39,665 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:39,675 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-04 09:27:39,990 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-04 09:27:39,990 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:27:39,992 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:40,001 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:40,021 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:40,022 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-04 09:27:40,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-04 09:27:40,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-04 09:27:40,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-04 09:27:40,023 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 12 states. [2018-10-04 09:27:40,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:40,061 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-04 09:27:40,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-04 09:27:40,062 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 12 [2018-10-04 09:27:40,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:40,062 INFO L225 Difference]: With dead ends: 16 [2018-10-04 09:27:40,062 INFO L226 Difference]: Without dead ends: 14 [2018-10-04 09:27:40,064 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-04 09:27:40,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-04 09:27:40,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-04 09:27:40,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-04 09:27:40,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-04 09:27:40,067 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2018-10-04 09:27:40,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:40,068 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-04 09:27:40,068 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-04 09:27:40,068 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-04 09:27:40,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-04 09:27:40,068 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:40,069 INFO L375 BasicCegarLoop]: trace histogram [10, 1, 1, 1] [2018-10-04 09:27:40,069 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:40,069 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:40,069 INFO L82 PathProgramCache]: Analyzing trace with hash -258347744, now seen corresponding path program 10 times [2018-10-04 09:27:40,069 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:40,070 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:40,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:40,071 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:27:40,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:40,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:40,301 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:40,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:40,302 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:40,310 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-04 09:27:40,326 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-04 09:27:40,326 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:27:40,327 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:40,336 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:40,367 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:40,367 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-04 09:27:40,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-04 09:27:40,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-04 09:27:40,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-04 09:27:40,369 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 13 states. [2018-10-04 09:27:40,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:40,423 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-10-04 09:27:40,423 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-04 09:27:40,423 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 13 [2018-10-04 09:27:40,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:40,424 INFO L225 Difference]: With dead ends: 17 [2018-10-04 09:27:40,424 INFO L226 Difference]: Without dead ends: 15 [2018-10-04 09:27:40,424 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-04 09:27:40,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-04 09:27:40,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-04 09:27:40,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-04 09:27:40,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-04 09:27:40,427 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2018-10-04 09:27:40,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:40,428 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-04 09:27:40,428 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-04 09:27:40,428 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-04 09:27:40,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-04 09:27:40,429 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:40,429 INFO L375 BasicCegarLoop]: trace histogram [11, 1, 1, 1] [2018-10-04 09:27:40,429 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:40,429 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:40,429 INFO L82 PathProgramCache]: Analyzing trace with hash 581150662, now seen corresponding path program 11 times [2018-10-04 09:27:40,429 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:40,429 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:40,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:40,430 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:27:40,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:40,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:40,705 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:40,705 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:40,705 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:40,714 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-04 09:27:43,177 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-10-04 09:27:43,177 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:27:43,180 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:43,189 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:43,213 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:43,214 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-04 09:27:43,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-04 09:27:43,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-04 09:27:43,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-04 09:27:43,215 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 14 states. [2018-10-04 09:27:43,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:43,267 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-10-04 09:27:43,267 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-04 09:27:43,267 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2018-10-04 09:27:43,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:43,268 INFO L225 Difference]: With dead ends: 18 [2018-10-04 09:27:43,268 INFO L226 Difference]: Without dead ends: 16 [2018-10-04 09:27:43,269 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-04 09:27:43,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-04 09:27:43,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-04 09:27:43,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-04 09:27:43,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-04 09:27:43,271 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2018-10-04 09:27:43,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:43,272 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-04 09:27:43,272 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-04 09:27:43,272 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-04 09:27:43,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-04 09:27:43,273 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:43,273 INFO L375 BasicCegarLoop]: trace histogram [12, 1, 1, 1] [2018-10-04 09:27:43,273 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:43,273 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:43,273 INFO L82 PathProgramCache]: Analyzing trace with hash 835797472, now seen corresponding path program 12 times [2018-10-04 09:27:43,273 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:43,273 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:43,274 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:43,275 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:27:43,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:43,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:43,610 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:43,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:43,611 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:43,618 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-04 09:27:43,651 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-04 09:27:43,651 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:27:43,653 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:43,662 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:43,689 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:43,690 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-04 09:27:43,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-04 09:27:43,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-04 09:27:43,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-04 09:27:43,691 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 15 states. [2018-10-04 09:27:43,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:43,728 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-04 09:27:43,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-04 09:27:43,729 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 15 [2018-10-04 09:27:43,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:43,730 INFO L225 Difference]: With dead ends: 19 [2018-10-04 09:27:43,730 INFO L226 Difference]: Without dead ends: 17 [2018-10-04 09:27:43,730 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-04 09:27:43,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-10-04 09:27:43,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-10-04 09:27:43,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-04 09:27:43,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-04 09:27:43,735 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2018-10-04 09:27:43,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:43,736 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-04 09:27:43,736 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-04 09:27:43,736 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-04 09:27:43,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-04 09:27:43,736 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:43,736 INFO L375 BasicCegarLoop]: trace histogram [13, 1, 1, 1] [2018-10-04 09:27:43,737 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:43,737 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:43,737 INFO L82 PathProgramCache]: Analyzing trace with hash 139913990, now seen corresponding path program 13 times [2018-10-04 09:27:43,737 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:43,737 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:43,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:43,738 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:27:43,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:43,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:43,995 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:43,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:43,996 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:44,008 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:27:44,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:44,020 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:44,030 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:44,056 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:44,056 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-04 09:27:44,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-04 09:27:44,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-04 09:27:44,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-04 09:27:44,057 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 16 states. [2018-10-04 09:27:44,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:44,277 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-10-04 09:27:44,277 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-04 09:27:44,277 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 16 [2018-10-04 09:27:44,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:44,278 INFO L225 Difference]: With dead ends: 20 [2018-10-04 09:27:44,278 INFO L226 Difference]: Without dead ends: 18 [2018-10-04 09:27:44,279 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-04 09:27:44,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-04 09:27:44,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-04 09:27:44,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-04 09:27:44,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-04 09:27:44,288 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2018-10-04 09:27:44,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:44,288 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-04 09:27:44,288 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-04 09:27:44,289 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-04 09:27:44,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-04 09:27:44,289 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:44,289 INFO L375 BasicCegarLoop]: trace histogram [14, 1, 1, 1] [2018-10-04 09:27:44,290 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:44,290 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:44,290 INFO L82 PathProgramCache]: Analyzing trace with hash 42362528, now seen corresponding path program 14 times [2018-10-04 09:27:44,290 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:44,290 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:44,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:44,291 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:27:44,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:44,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:44,576 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:44,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:44,577 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:44,592 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 09:27:44,614 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 09:27:44,614 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:27:44,616 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:44,625 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:44,649 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:44,649 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-04 09:27:44,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-04 09:27:44,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-04 09:27:44,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-04 09:27:44,651 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 17 states. [2018-10-04 09:27:44,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:44,714 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-04 09:27:44,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-04 09:27:44,715 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 17 [2018-10-04 09:27:44,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:44,716 INFO L225 Difference]: With dead ends: 21 [2018-10-04 09:27:44,716 INFO L226 Difference]: Without dead ends: 19 [2018-10-04 09:27:44,717 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-04 09:27:44,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-04 09:27:44,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-04 09:27:44,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-04 09:27:44,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-10-04 09:27:44,721 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2018-10-04 09:27:44,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:44,721 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-10-04 09:27:44,721 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-04 09:27:44,722 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-10-04 09:27:44,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-04 09:27:44,722 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:44,722 INFO L375 BasicCegarLoop]: trace histogram [15, 1, 1, 1] [2018-10-04 09:27:44,723 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:44,723 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:44,723 INFO L82 PathProgramCache]: Analyzing trace with hash 1313234502, now seen corresponding path program 15 times [2018-10-04 09:27:44,723 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:44,723 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:44,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:44,724 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:27:44,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:44,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:45,009 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:45,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:45,010 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:45,019 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-04 09:27:47,346 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-04 09:27:47,346 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:27:47,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:47,357 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:47,378 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:47,378 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-04 09:27:47,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-04 09:27:47,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-04 09:27:47,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-04 09:27:47,379 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 18 states. [2018-10-04 09:27:47,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:47,424 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-04 09:27:47,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-04 09:27:47,424 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 18 [2018-10-04 09:27:47,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:47,425 INFO L225 Difference]: With dead ends: 22 [2018-10-04 09:27:47,425 INFO L226 Difference]: Without dead ends: 20 [2018-10-04 09:27:47,426 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-04 09:27:47,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-04 09:27:47,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-04 09:27:47,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-04 09:27:47,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-04 09:27:47,431 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2018-10-04 09:27:47,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:47,432 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-04 09:27:47,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-04 09:27:47,432 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-04 09:27:47,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-04 09:27:47,433 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:47,433 INFO L375 BasicCegarLoop]: trace histogram [16, 1, 1, 1] [2018-10-04 09:27:47,433 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:47,433 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:47,433 INFO L82 PathProgramCache]: Analyzing trace with hash 2055560032, now seen corresponding path program 16 times [2018-10-04 09:27:47,433 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:47,433 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:47,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:47,434 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:27:47,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:47,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:48,239 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:48,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:48,239 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:48,246 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-04 09:27:48,267 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-04 09:27:48,268 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:27:48,269 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:27:48,280 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:48,309 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:27:48,309 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-04 09:27:48,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-04 09:27:48,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-04 09:27:48,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-04 09:27:48,310 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 19 states. [2018-10-04 09:27:48,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:27:48,448 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-04 09:27:48,449 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-04 09:27:48,449 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 19 [2018-10-04 09:27:48,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:27:48,449 INFO L225 Difference]: With dead ends: 23 [2018-10-04 09:27:48,449 INFO L226 Difference]: Without dead ends: 21 [2018-10-04 09:27:48,450 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-04 09:27:48,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-04 09:27:48,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-04 09:27:48,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-04 09:27:48,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-04 09:27:48,453 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2018-10-04 09:27:48,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:27:48,453 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-04 09:27:48,453 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-04 09:27:48,453 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-04 09:27:48,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-04 09:27:48,454 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:27:48,454 INFO L375 BasicCegarLoop]: trace histogram [17, 1, 1, 1] [2018-10-04 09:27:48,454 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:27:48,454 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:27:48,455 INFO L82 PathProgramCache]: Analyzing trace with hash -702152314, now seen corresponding path program 17 times [2018-10-04 09:27:48,455 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:27:48,455 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:27:48,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:48,456 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:27:48,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:27:48,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:27:48,869 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:27:48,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:27:48,870 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:27:48,877 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-04 09:28:38,333 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2018-10-04 09:28:38,333 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:28:38,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:28:38,711 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:28:38,739 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:28:38,739 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-04 09:28:38,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-04 09:28:38,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-04 09:28:38,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-04 09:28:38,740 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 20 states. [2018-10-04 09:28:38,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:28:38,811 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-04 09:28:38,811 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-04 09:28:38,811 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 20 [2018-10-04 09:28:38,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:28:38,812 INFO L225 Difference]: With dead ends: 24 [2018-10-04 09:28:38,812 INFO L226 Difference]: Without dead ends: 22 [2018-10-04 09:28:38,813 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-04 09:28:38,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-04 09:28:38,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-04 09:28:38,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-04 09:28:38,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-04 09:28:38,818 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2018-10-04 09:28:38,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:28:38,818 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-04 09:28:38,818 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-04 09:28:38,819 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-04 09:28:38,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-04 09:28:38,819 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:28:38,819 INFO L375 BasicCegarLoop]: trace histogram [18, 1, 1, 1] [2018-10-04 09:28:38,820 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:28:38,823 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:28:38,823 INFO L82 PathProgramCache]: Analyzing trace with hash -291889120, now seen corresponding path program 18 times [2018-10-04 09:28:38,823 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:28:38,823 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:28:38,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:28:38,824 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:28:38,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:28:38,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:28:39,138 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:28:39,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:28:39,139 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:28:39,149 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-04 09:28:41,074 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2018-10-04 09:28:41,075 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:28:41,083 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:28:41,094 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:28:41,124 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:28:41,124 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2018-10-04 09:28:41,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-04 09:28:41,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-04 09:28:41,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-04 09:28:41,125 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 21 states. [2018-10-04 09:28:41,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:28:41,180 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-04 09:28:41,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-04 09:28:41,181 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 21 [2018-10-04 09:28:41,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:28:41,182 INFO L225 Difference]: With dead ends: 25 [2018-10-04 09:28:41,182 INFO L226 Difference]: Without dead ends: 23 [2018-10-04 09:28:41,183 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-04 09:28:41,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-04 09:28:41,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-10-04 09:28:41,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-04 09:28:41,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-04 09:28:41,186 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2018-10-04 09:28:41,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:28:41,187 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-04 09:28:41,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-04 09:28:41,187 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-04 09:28:41,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-04 09:28:41,188 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:28:41,188 INFO L375 BasicCegarLoop]: trace histogram [19, 1, 1, 1] [2018-10-04 09:28:41,188 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:28:41,188 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:28:41,188 INFO L82 PathProgramCache]: Analyzing trace with hash -458631994, now seen corresponding path program 19 times [2018-10-04 09:28:41,189 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:28:41,189 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:28:41,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:28:41,190 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:28:41,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:28:41,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:28:41,441 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:28:41,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:28:41,441 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:28:41,451 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:28:41,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:28:41,479 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:28:41,489 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:28:41,518 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:28:41,518 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-10-04 09:28:41,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-04 09:28:41,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-04 09:28:41,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-04 09:28:41,519 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 22 states. [2018-10-04 09:28:41,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:28:41,624 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-10-04 09:28:41,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-04 09:28:41,625 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 22 [2018-10-04 09:28:41,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:28:41,626 INFO L225 Difference]: With dead ends: 26 [2018-10-04 09:28:41,626 INFO L226 Difference]: Without dead ends: 24 [2018-10-04 09:28:41,627 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-04 09:28:41,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-04 09:28:41,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-04 09:28:41,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-04 09:28:41,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-04 09:28:41,631 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2018-10-04 09:28:41,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:28:41,632 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-04 09:28:41,632 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-04 09:28:41,632 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-04 09:28:41,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-04 09:28:41,633 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:28:41,633 INFO L375 BasicCegarLoop]: trace histogram [20, 1, 1, 1] [2018-10-04 09:28:41,633 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:28:41,633 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:28:41,633 INFO L82 PathProgramCache]: Analyzing trace with hash -1332693792, now seen corresponding path program 20 times [2018-10-04 09:28:41,634 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:28:41,634 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:28:41,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:28:41,635 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:28:41,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:28:41,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:28:42,009 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:28:42,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:28:42,010 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:28:42,019 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 09:28:42,037 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 09:28:42,038 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:28:42,039 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:28:42,049 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:28:42,078 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:28:42,079 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-10-04 09:28:42,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-04 09:28:42,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-04 09:28:42,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-04 09:28:42,080 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 23 states. [2018-10-04 09:28:42,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:28:42,295 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-04 09:28:42,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-04 09:28:42,295 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 23 [2018-10-04 09:28:42,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:28:42,296 INFO L225 Difference]: With dead ends: 27 [2018-10-04 09:28:42,296 INFO L226 Difference]: Without dead ends: 25 [2018-10-04 09:28:42,297 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-04 09:28:42,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-04 09:28:42,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-04 09:28:42,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-04 09:28:42,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-10-04 09:28:42,300 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2018-10-04 09:28:42,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:28:42,300 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-10-04 09:28:42,300 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-04 09:28:42,300 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-10-04 09:28:42,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-04 09:28:42,301 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:28:42,301 INFO L375 BasicCegarLoop]: trace histogram [21, 1, 1, 1] [2018-10-04 09:28:42,301 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:28:42,302 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:28:42,302 INFO L82 PathProgramCache]: Analyzing trace with hash 1636161542, now seen corresponding path program 21 times [2018-10-04 09:28:42,302 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:28:42,302 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:28:42,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:28:42,303 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:28:42,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:28:42,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:28:42,725 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:28:42,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:28:42,725 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:28:42,732 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-04 09:29:17,041 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-04 09:29:17,042 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:29:17,053 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:29:17,068 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:29:17,090 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:29:17,090 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-10-04 09:29:17,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-04 09:29:17,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-04 09:29:17,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-04 09:29:17,091 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 24 states. [2018-10-04 09:29:17,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:29:17,153 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-10-04 09:29:17,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-04 09:29:17,154 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 24 [2018-10-04 09:29:17,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:29:17,155 INFO L225 Difference]: With dead ends: 28 [2018-10-04 09:29:17,155 INFO L226 Difference]: Without dead ends: 26 [2018-10-04 09:29:17,156 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-04 09:29:17,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-04 09:29:17,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-04 09:29:17,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-04 09:29:17,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-04 09:29:17,160 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2018-10-04 09:29:17,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:29:17,160 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-04 09:29:17,160 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-04 09:29:17,160 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-04 09:29:17,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-04 09:29:17,161 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:29:17,161 INFO L375 BasicCegarLoop]: trace histogram [22, 1, 1, 1] [2018-10-04 09:29:17,161 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:29:17,161 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:29:17,162 INFO L82 PathProgramCache]: Analyzing trace with hash -818603616, now seen corresponding path program 22 times [2018-10-04 09:29:17,162 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:29:17,162 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:29:17,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:29:17,163 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:29:17,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:29:17,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:29:17,502 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:29:17,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:29:17,502 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:29:17,512 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-04 09:29:17,531 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-04 09:29:17,531 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:29:17,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:29:17,542 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:29:17,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:29:17,570 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 24 [2018-10-04 09:29:17,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-04 09:29:17,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-04 09:29:17,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-04 09:29:17,571 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 25 states. [2018-10-04 09:29:17,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:29:17,637 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-04 09:29:17,638 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-04 09:29:17,638 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 25 [2018-10-04 09:29:17,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:29:17,639 INFO L225 Difference]: With dead ends: 29 [2018-10-04 09:29:17,639 INFO L226 Difference]: Without dead ends: 27 [2018-10-04 09:29:17,640 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-04 09:29:17,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-04 09:29:17,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-10-04 09:29:17,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-04 09:29:17,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-04 09:29:17,643 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2018-10-04 09:29:17,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:29:17,644 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-04 09:29:17,644 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-04 09:29:17,644 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-04 09:29:17,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-04 09:29:17,644 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:29:17,644 INFO L375 BasicCegarLoop]: trace histogram [23, 1, 1, 1] [2018-10-04 09:29:17,645 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:29:17,645 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:29:17,645 INFO L82 PathProgramCache]: Analyzing trace with hash 393087814, now seen corresponding path program 23 times [2018-10-04 09:29:17,645 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:29:17,645 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:29:17,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:29:17,646 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:29:17,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:29:17,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:29:18,003 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:29:18,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:29:18,004 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:29:18,011 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-04 09:30:31,204 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2018-10-04 09:30:31,204 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:30:31,342 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:30:31,354 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:30:31,385 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:30:31,385 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-10-04 09:30:31,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-04 09:30:31,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-04 09:30:31,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-04 09:30:31,386 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 26 states. [2018-10-04 09:30:31,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:30:31,478 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-04 09:30:31,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-04 09:30:31,479 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 26 [2018-10-04 09:30:31,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:30:31,479 INFO L225 Difference]: With dead ends: 30 [2018-10-04 09:30:31,479 INFO L226 Difference]: Without dead ends: 28 [2018-10-04 09:30:31,480 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-04 09:30:31,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-04 09:30:31,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-04 09:30:31,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-04 09:30:31,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-04 09:30:31,484 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2018-10-04 09:30:31,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:30:31,484 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-04 09:30:31,485 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-04 09:30:31,485 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-04 09:30:31,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-04 09:30:31,485 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:30:31,485 INFO L375 BasicCegarLoop]: trace histogram [24, 1, 1, 1] [2018-10-04 09:30:31,485 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:30:31,487 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:30:31,487 INFO L82 PathProgramCache]: Analyzing trace with hash -699183520, now seen corresponding path program 24 times [2018-10-04 09:30:31,487 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:30:31,487 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:30:31,488 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:30:31,488 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:30:31,488 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:30:31,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:30:32,645 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:30:32,645 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:30:32,645 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:30:32,654 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-04 09:30:40,589 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-04 09:30:40,589 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:30:40,608 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:30:40,617 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:30:40,643 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:30:40,643 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 26 [2018-10-04 09:30:40,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-04 09:30:40,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-04 09:30:40,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-04 09:30:40,644 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 27 states. [2018-10-04 09:30:40,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:30:40,690 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-04 09:30:40,690 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-04 09:30:40,690 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 27 [2018-10-04 09:30:40,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:30:40,691 INFO L225 Difference]: With dead ends: 31 [2018-10-04 09:30:40,691 INFO L226 Difference]: Without dead ends: 29 [2018-10-04 09:30:40,692 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-04 09:30:40,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-04 09:30:40,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-04 09:30:40,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-04 09:30:40,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-04 09:30:40,696 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2018-10-04 09:30:40,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:30:40,697 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-04 09:30:40,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-04 09:30:40,697 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-04 09:30:40,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-04 09:30:40,698 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:30:40,698 INFO L375 BasicCegarLoop]: trace histogram [25, 1, 1, 1] [2018-10-04 09:30:40,698 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:30:40,698 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:30:40,698 INFO L82 PathProgramCache]: Analyzing trace with hash -199856506, now seen corresponding path program 25 times [2018-10-04 09:30:40,698 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:30:40,698 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:30:40,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:30:40,699 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:30:40,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:30:40,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:30:41,275 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:30:41,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:30:41,275 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:30:41,285 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:30:41,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:30:41,307 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:30:41,317 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:30:41,340 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:30:41,341 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 27 [2018-10-04 09:30:41,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-04 09:30:41,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-04 09:30:41,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-04 09:30:41,342 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 28 states. [2018-10-04 09:30:41,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:30:41,391 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-10-04 09:30:41,391 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-04 09:30:41,391 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 28 [2018-10-04 09:30:41,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:30:41,392 INFO L225 Difference]: With dead ends: 32 [2018-10-04 09:30:41,392 INFO L226 Difference]: Without dead ends: 30 [2018-10-04 09:30:41,393 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-04 09:30:41,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-04 09:30:41,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-04 09:30:41,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-04 09:30:41,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-04 09:30:41,396 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2018-10-04 09:30:41,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:30:41,397 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-04 09:30:41,397 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-04 09:30:41,397 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-04 09:30:41,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-04 09:30:41,398 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:30:41,398 INFO L375 BasicCegarLoop]: trace histogram [26, 1, 1, 1] [2018-10-04 09:30:41,398 INFO L423 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:30:41,398 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:30:41,398 INFO L82 PathProgramCache]: Analyzing trace with hash -1900588256, now seen corresponding path program 26 times [2018-10-04 09:30:41,398 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:30:41,398 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:30:41,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:30:41,399 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:30:41,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:30:41,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:30:42,463 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:30:42,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:30:42,463 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:30:42,470 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 09:30:42,490 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 09:30:42,490 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:30:42,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:30:42,502 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:30:42,532 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:30:42,532 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 28 [2018-10-04 09:30:42,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-04 09:30:42,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-04 09:30:42,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-04 09:30:42,533 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 29 states. [2018-10-04 09:30:42,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:30:42,716 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-04 09:30:42,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-04 09:30:42,717 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 29 [2018-10-04 09:30:42,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:30:42,718 INFO L225 Difference]: With dead ends: 33 [2018-10-04 09:30:42,718 INFO L226 Difference]: Without dead ends: 31 [2018-10-04 09:30:42,719 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-04 09:30:42,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-04 09:30:42,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-10-04 09:30:42,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-04 09:30:42,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-10-04 09:30:42,722 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2018-10-04 09:30:42,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:30:42,722 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-10-04 09:30:42,722 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-04 09:30:42,723 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-10-04 09:30:42,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-04 09:30:42,723 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:30:42,723 INFO L375 BasicCegarLoop]: trace histogram [27, 1, 1, 1] [2018-10-04 09:30:42,723 INFO L423 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:30:42,724 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:30:42,724 INFO L82 PathProgramCache]: Analyzing trace with hash 1211302342, now seen corresponding path program 27 times [2018-10-04 09:30:42,724 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:30:42,724 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:30:42,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:30:42,725 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:30:42,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:30:42,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:30:43,430 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:30:43,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:30:43,431 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:30:43,439 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-04 09:31:37,157 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-04 09:31:37,158 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:31:37,214 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:31:37,225 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:31:37,230 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:31:37,231 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 29 [2018-10-04 09:31:37,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-04 09:31:37,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-04 09:31:37,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-04 09:31:37,232 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 30 states. [2018-10-04 09:31:37,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:31:37,304 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-10-04 09:31:37,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-04 09:31:37,305 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 30 [2018-10-04 09:31:37,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:31:37,306 INFO L225 Difference]: With dead ends: 34 [2018-10-04 09:31:37,306 INFO L226 Difference]: Without dead ends: 32 [2018-10-04 09:31:37,307 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-04 09:31:37,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-04 09:31:37,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-04 09:31:37,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-04 09:31:37,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-04 09:31:37,310 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2018-10-04 09:31:37,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:31:37,310 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-04 09:31:37,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-04 09:31:37,311 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-04 09:31:37,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-04 09:31:37,311 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:31:37,311 INFO L375 BasicCegarLoop]: trace histogram [28, 1, 1, 1] [2018-10-04 09:31:37,312 INFO L423 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:31:37,312 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:31:37,312 INFO L82 PathProgramCache]: Analyzing trace with hash -1104336928, now seen corresponding path program 28 times [2018-10-04 09:31:37,312 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:31:37,312 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:31:37,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:31:37,313 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:31:37,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:31:37,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:31:37,703 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:31:37,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:31:37,703 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:31:37,711 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-04 09:31:37,731 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-04 09:31:37,731 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:31:37,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:31:37,742 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:31:37,766 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:31:37,766 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 30 [2018-10-04 09:31:37,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-04 09:31:37,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-04 09:31:37,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-04 09:31:37,768 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 31 states. [2018-10-04 09:31:37,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:31:37,838 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-04 09:31:37,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-04 09:31:37,838 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 31 [2018-10-04 09:31:37,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:31:37,839 INFO L225 Difference]: With dead ends: 35 [2018-10-04 09:31:37,839 INFO L226 Difference]: Without dead ends: 33 [2018-10-04 09:31:37,840 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-04 09:31:37,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-04 09:31:37,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-04 09:31:37,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-04 09:31:37,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-04 09:31:37,844 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2018-10-04 09:31:37,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:31:37,844 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-04 09:31:37,844 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-04 09:31:37,844 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-04 09:31:37,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-04 09:31:37,845 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:31:37,845 INFO L375 BasicCegarLoop]: trace histogram [29, 1, 1, 1] [2018-10-04 09:31:37,845 INFO L423 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:31:37,845 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:31:37,845 INFO L82 PathProgramCache]: Analyzing trace with hash 125289734, now seen corresponding path program 29 times [2018-10-04 09:31:37,846 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:31:37,846 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:31:37,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:31:37,846 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:31:37,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:31:37,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:31:39,724 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:31:39,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:31:39,724 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-10-04 09:31:39,733 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown