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-c372c2b [2018-10-02 11:54:39,849 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-02 11:54:39,853 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-02 11:54:39,872 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-02 11:54:39,872 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-02 11:54:39,873 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-02 11:54:39,874 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-02 11:54:39,876 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-02 11:54:39,878 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-02 11:54:39,879 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-02 11:54:39,879 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-02 11:54:39,880 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-02 11:54:39,881 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-02 11:54:39,882 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-02 11:54:39,883 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-02 11:54:39,883 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-02 11:54:39,884 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-02 11:54:39,886 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-02 11:54:39,888 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-02 11:54:39,889 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-02 11:54:39,890 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-02 11:54:39,892 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-02 11:54:39,894 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-02 11:54:39,902 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 [2018-10-02 11:54:39,917 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-02 11:54:39,917 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-02 11:54:39,918 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-02 11:54:39,918 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-02 11:54:39,919 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-02 11:54:39,919 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-02 11:54:39,919 INFO L133 SettingsManager]: * Use SBE=true [2018-10-02 11:54:39,920 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-02 11:54:39,920 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-02 11:54:39,920 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-02 11:54:39,920 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-02 11:54:39,920 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-02 11:54:39,921 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-02 11:54:39,921 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-02 11:54:39,921 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-02 11:54:39,921 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-02 11:54:39,921 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-02 11:54:39,921 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-02 11:54:39,922 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-02 11:54:39,922 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-02 11:54:39,922 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-02 11:54:39,922 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-02 11:54:39,922 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-02 11:54:39,923 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-02 11:54:39,923 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-02 11:54:39,923 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-02 11:54:39,923 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-02 11:54:39,923 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-02 11:54:39,924 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-02 11:54:39,924 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-02 11:54:39,968 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-02 11:54:39,981 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-02 11:54:39,985 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-02 11:54:39,987 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-10-02 11:54:39,987 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-10-02 11:54:39,988 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/NeonAngel01.bpl [2018-10-02 11:54:39,988 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/NeonAngel01.bpl' [2018-10-02 11:54:40,037 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-02 11:54:40,040 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-10-02 11:54:40,041 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-02 11:54:40,042 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-02 11:54:40,042 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-02 11:54:40,062 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:54:40" (1/1) ... [2018-10-02 11:54:40,075 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:54:40" (1/1) ... [2018-10-02 11:54:40,079 WARN L165 Inliner]: Program contained no entry procedure! [2018-10-02 11:54:40,080 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2018-10-02 11:54:40,080 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2018-10-02 11:54:40,082 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-02 11:54:40,083 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-02 11:54:40,083 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-02 11:54:40,083 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-02 11:54:40,094 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:54:40" (1/1) ... [2018-10-02 11:54:40,095 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:54:40" (1/1) ... [2018-10-02 11:54:40,095 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:54:40" (1/1) ... [2018-10-02 11:54:40,096 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:54:40" (1/1) ... [2018-10-02 11:54:40,098 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:54:40" (1/1) ... [2018-10-02 11:54:40,102 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:54:40" (1/1) ... [2018-10-02 11:54:40,103 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:54:40" (1/1) ... [2018-10-02 11:54:40,104 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-02 11:54:40,104 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-02 11:54:40,105 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-02 11:54:40,105 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-02 11:54:40,106 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:54:40" (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 [2018-10-02 11:54:40,179 INFO L124 BoogieDeclarations]: Specification and implementation of procedure main given in one single declaration [2018-10-02 11:54:40,179 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-02 11:54:40,180 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-02 11:54:40,375 INFO L337 CfgBuilder]: Using library mode [2018-10-02 11:54:40,375 INFO L202 PluginConnector]: Adding new model NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.10 11:54:40 BoogieIcfgContainer [2018-10-02 11:54:40,375 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-02 11:54:40,377 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-02 11:54:40,377 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-02 11:54:40,380 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-02 11:54:40,380 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:54:40" (1/2) ... [2018-10-02 11:54:40,381 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10d37753 and model type NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.10 11:54:40, skipping insertion in model container [2018-10-02 11:54:40,382 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.10 11:54:40" (2/2) ... [2018-10-02 11:54:40,383 INFO L112 eAbstractionObserver]: Analyzing ICFG NeonAngel01.bpl [2018-10-02 11:54:40,394 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-02 11:54:40,405 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-02 11:54:40,456 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-02 11:54:40,457 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-10-02 11:54:40,457 INFO L382 AbstractCegarLoop]: Hoare is true [2018-10-02 11:54:40,458 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-02 11:54:40,458 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-02 11:54:40,458 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-02 11:54:40,458 INFO L386 AbstractCegarLoop]: Difference is false [2018-10-02 11:54:40,458 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-02 11:54:40,459 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-02 11:54:40,473 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-10-02 11:54:40,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-10-02 11:54:40,480 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:40,481 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-10-02 11:54:40,482 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:40,490 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:40,491 INFO L82 PathProgramCache]: Analyzing trace with hash 30048, now seen corresponding path program 1 times [2018-10-02 11:54:40,493 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:40,494 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:40,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:40,544 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:54:40,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:40,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:40,639 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:40,642 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-02 11:54:40,642 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-02 11:54:40,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-02 11:54:40,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-02 11:54:40,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-02 11:54:40,662 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-10-02 11:54:40,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:40,742 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2018-10-02 11:54:40,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-02 11:54:40,744 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-10-02 11:54:40,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:40,755 INFO L225 Difference]: With dead ends: 13 [2018-10-02 11:54:40,755 INFO L226 Difference]: Without dead ends: 5 [2018-10-02 11:54:40,759 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 [2018-10-02 11:54:40,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-10-02 11:54:40,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-10-02 11:54:40,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-10-02 11:54:40,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 5 transitions. [2018-10-02 11:54:40,795 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 5 transitions. Word has length 3 [2018-10-02 11:54:40,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:40,795 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 5 transitions. [2018-10-02 11:54:40,796 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-02 11:54:40,796 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-10-02 11:54:40,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-10-02 11:54:40,796 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:40,796 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-10-02 11:54:40,797 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:40,797 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:40,797 INFO L82 PathProgramCache]: Analyzing trace with hash 927622, now seen corresponding path program 1 times [2018-10-02 11:54:40,797 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:40,798 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:40,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:40,799 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:54:40,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:40,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:40,935 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:40,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:40,935 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) [2018-10-02 11:54:40,960 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 11:54:40,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:40,990 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:41,006 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:41,027 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:41,027 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-10-02 11:54:41,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-02 11:54:41,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-02 11:54:41,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-02 11:54:41,029 INFO L87 Difference]: Start difference. First operand 5 states and 5 transitions. Second operand 4 states. [2018-10-02 11:54:41,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:41,049 INFO L93 Difference]: Finished difference Result 8 states and 8 transitions. [2018-10-02 11:54:41,054 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-02 11:54:41,054 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2018-10-02 11:54:41,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:41,054 INFO L225 Difference]: With dead ends: 8 [2018-10-02 11:54:41,055 INFO L226 Difference]: Without dead ends: 6 [2018-10-02 11:54:41,056 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 [2018-10-02 11:54:41,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2018-10-02 11:54:41,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2018-10-02 11:54:41,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-10-02 11:54:41,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2018-10-02 11:54:41,060 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2018-10-02 11:54:41,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:41,060 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2018-10-02 11:54:41,060 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-02 11:54:41,060 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2018-10-02 11:54:41,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-10-02 11:54:41,062 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:41,062 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2018-10-02 11:54:41,063 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:41,063 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:41,063 INFO L82 PathProgramCache]: Analyzing trace with hash 28752416, now seen corresponding path program 2 times [2018-10-02 11:54:41,068 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:41,068 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:41,069 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:41,070 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:54:41,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:41,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:41,158 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:41,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:41,159 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 [2018-10-02 11:54:41,174 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:54:41,211 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:54:41,211 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:54:41,212 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:41,217 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:41,242 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:41,242 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-02 11:54:41,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-02 11:54:41,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-02 11:54:41,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-10-02 11:54:41,244 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 5 states. [2018-10-02 11:54:41,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:41,274 INFO L93 Difference]: Finished difference Result 9 states and 9 transitions. [2018-10-02 11:54:41,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-02 11:54:41,274 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2018-10-02 11:54:41,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:41,275 INFO L225 Difference]: With dead ends: 9 [2018-10-02 11:54:41,275 INFO L226 Difference]: Without dead ends: 7 [2018-10-02 11:54:41,275 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 [2018-10-02 11:54:41,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-10-02 11:54:41,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-10-02 11:54:41,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-10-02 11:54:41,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-10-02 11:54:41,279 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 5 [2018-10-02 11:54:41,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:41,279 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-10-02 11:54:41,279 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-02 11:54:41,280 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-10-02 11:54:41,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-02 11:54:41,280 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:41,280 INFO L375 BasicCegarLoop]: trace histogram [3, 1, 1, 1] [2018-10-02 11:54:41,281 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:41,281 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:41,281 INFO L82 PathProgramCache]: Analyzing trace with hash 891321030, now seen corresponding path program 3 times [2018-10-02 11:54:41,281 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:41,282 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:41,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:41,283 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:54:41,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:41,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:41,389 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:41,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:41,389 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 [2018-10-02 11:54:41,400 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:54:41,412 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-02 11:54:41,413 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:54:41,414 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:41,421 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:41,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:41,442 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-02 11:54:41,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-02 11:54:41,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-02 11:54:41,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-02 11:54:41,443 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 6 states. [2018-10-02 11:54:41,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:41,473 INFO L93 Difference]: Finished difference Result 10 states and 10 transitions. [2018-10-02 11:54:41,473 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-02 11:54:41,473 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2018-10-02 11:54:41,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:41,474 INFO L225 Difference]: With dead ends: 10 [2018-10-02 11:54:41,474 INFO L226 Difference]: Without dead ends: 8 [2018-10-02 11:54:41,475 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 [2018-10-02 11:54:41,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-10-02 11:54:41,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-10-02 11:54:41,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-10-02 11:54:41,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-10-02 11:54:41,477 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-10-02 11:54:41,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:41,478 INFO L480 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-10-02 11:54:41,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-02 11:54:41,478 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-10-02 11:54:41,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-02 11:54:41,478 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:41,479 INFO L375 BasicCegarLoop]: trace histogram [4, 1, 1, 1] [2018-10-02 11:54:41,479 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:41,479 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:41,479 INFO L82 PathProgramCache]: Analyzing trace with hash 1861144288, now seen corresponding path program 4 times [2018-10-02 11:54:41,479 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:41,480 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:41,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:41,481 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:54:41,481 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:41,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:41,795 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:41,796 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:41,796 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 [2018-10-02 11:54:41,810 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:54:41,824 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:54:41,824 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:54:41,826 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:41,838 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:41,860 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:41,860 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-02 11:54:41,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-02 11:54:41,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-02 11:54:41,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-02 11:54:41,862 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 7 states. [2018-10-02 11:54:41,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:41,904 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-10-02 11:54:41,904 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-02 11:54:41,904 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2018-10-02 11:54:41,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:41,905 INFO L225 Difference]: With dead ends: 11 [2018-10-02 11:54:41,905 INFO L226 Difference]: Without dead ends: 9 [2018-10-02 11:54:41,906 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 [2018-10-02 11:54:41,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-10-02 11:54:41,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-10-02 11:54:41,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-02 11:54:41,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-10-02 11:54:41,910 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2018-10-02 11:54:41,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:41,910 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-10-02 11:54:41,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-02 11:54:41,910 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-10-02 11:54:41,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-10-02 11:54:41,911 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:41,911 INFO L375 BasicCegarLoop]: trace histogram [5, 1, 1, 1] [2018-10-02 11:54:41,911 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:41,911 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:41,912 INFO L82 PathProgramCache]: Analyzing trace with hash 1860894214, now seen corresponding path program 5 times [2018-10-02 11:54:41,912 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:41,912 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:41,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:41,913 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:54:41,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:41,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:42,063 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:42,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:42,064 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 [2018-10-02 11:54:42,074 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:54:42,103 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2018-10-02 11:54:42,104 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:54:42,105 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:42,117 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:42,150 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:42,150 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-02 11:54:42,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-02 11:54:42,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-02 11:54:42,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-02 11:54:42,151 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 8 states. [2018-10-02 11:54:42,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:42,221 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2018-10-02 11:54:42,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-02 11:54:42,223 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 8 [2018-10-02 11:54:42,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:42,223 INFO L225 Difference]: With dead ends: 12 [2018-10-02 11:54:42,223 INFO L226 Difference]: Without dead ends: 10 [2018-10-02 11:54:42,224 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 [2018-10-02 11:54:42,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-10-02 11:54:42,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-10-02 11:54:42,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-10-02 11:54:42,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-10-02 11:54:42,227 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2018-10-02 11:54:42,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:42,227 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-10-02 11:54:42,227 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-02 11:54:42,228 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-10-02 11:54:42,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-10-02 11:54:42,228 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:42,228 INFO L375 BasicCegarLoop]: trace histogram [6, 1, 1, 1] [2018-10-02 11:54:42,229 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:42,229 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:42,229 INFO L82 PathProgramCache]: Analyzing trace with hash 1853141920, now seen corresponding path program 6 times [2018-10-02 11:54:42,229 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:42,229 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:42,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:42,231 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:54:42,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:42,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:42,444 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:42,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:42,445 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 [2018-10-02 11:54:42,453 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:54:42,465 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2018-10-02 11:54:42,465 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:54:42,467 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:42,478 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:42,503 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:42,503 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-02 11:54:42,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-02 11:54:42,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-02 11:54:42,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-02 11:54:42,504 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 9 states. [2018-10-02 11:54:42,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:42,543 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-10-02 11:54:42,544 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-02 11:54:42,544 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 9 [2018-10-02 11:54:42,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:42,544 INFO L225 Difference]: With dead ends: 13 [2018-10-02 11:54:42,544 INFO L226 Difference]: Without dead ends: 11 [2018-10-02 11:54:42,545 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 [2018-10-02 11:54:42,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-10-02 11:54:42,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-10-02 11:54:42,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-10-02 11:54:42,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-10-02 11:54:42,549 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2018-10-02 11:54:42,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:42,549 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-10-02 11:54:42,549 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-02 11:54:42,549 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-10-02 11:54:42,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-02 11:54:42,550 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:42,550 INFO L375 BasicCegarLoop]: trace histogram [7, 1, 1, 1] [2018-10-02 11:54:42,550 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:42,551 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:42,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1612820806, now seen corresponding path program 7 times [2018-10-02 11:54:42,551 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:42,551 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:42,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:42,552 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:54:42,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:42,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:42,715 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:42,716 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:42,716 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 [2018-10-02 11:54:42,724 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:54:42,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:42,748 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:42,767 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:42,800 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:42,801 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-02 11:54:42,801 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-02 11:54:42,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-02 11:54:42,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-02 11:54:42,802 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 10 states. [2018-10-02 11:54:43,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:43,045 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-10-02 11:54:43,045 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-02 11:54:43,045 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 10 [2018-10-02 11:54:43,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:43,046 INFO L225 Difference]: With dead ends: 14 [2018-10-02 11:54:43,046 INFO L226 Difference]: Without dead ends: 12 [2018-10-02 11:54:43,047 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 [2018-10-02 11:54:43,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-02 11:54:43,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-02 11:54:43,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-02 11:54:43,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-02 11:54:43,050 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-10-02 11:54:43,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:43,050 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-02 11:54:43,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-02 11:54:43,051 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-02 11:54:43,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-02 11:54:43,051 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:43,051 INFO L375 BasicCegarLoop]: trace histogram [8, 1, 1, 1] [2018-10-02 11:54:43,052 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:43,052 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:43,052 INFO L82 PathProgramCache]: Analyzing trace with hash -1542166432, now seen corresponding path program 8 times [2018-10-02 11:54:43,052 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:43,052 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:43,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:43,053 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:54:43,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:43,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:43,224 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:43,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:43,225 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 [2018-10-02 11:54:43,233 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:54:43,244 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:54:43,245 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:54:43,247 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:43,254 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:43,275 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:43,275 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-02 11:54:43,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-02 11:54:43,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-02 11:54:43,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-02 11:54:43,276 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 11 states. [2018-10-02 11:54:43,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:43,314 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-10-02 11:54:43,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-02 11:54:43,314 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 11 [2018-10-02 11:54:43,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:43,315 INFO L225 Difference]: With dead ends: 15 [2018-10-02 11:54:43,315 INFO L226 Difference]: Without dead ends: 13 [2018-10-02 11:54:43,316 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-02 11:54:43,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-02 11:54:43,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-02 11:54:43,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-02 11:54:43,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-02 11:54:43,319 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2018-10-02 11:54:43,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:43,320 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-02 11:54:43,320 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-02 11:54:43,320 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-02 11:54:43,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-02 11:54:43,321 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:43,321 INFO L375 BasicCegarLoop]: trace histogram [9, 1, 1, 1] [2018-10-02 11:54:43,321 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:43,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:43,321 INFO L82 PathProgramCache]: Analyzing trace with hash -562523002, now seen corresponding path program 9 times [2018-10-02 11:54:43,322 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:43,322 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:43,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:43,323 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:54:43,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:43,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:43,611 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:43,611 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:43,611 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-10-02 11:54:43,621 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:54:43,948 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-02 11:54:43,949 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:54:43,950 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:43,959 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:43,981 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:43,981 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-02 11:54:43,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-02 11:54:43,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-02 11:54:43,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-02 11:54:43,983 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 12 states. [2018-10-02 11:54:44,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:44,030 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-02 11:54:44,031 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-02 11:54:44,031 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 12 [2018-10-02 11:54:44,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:44,031 INFO L225 Difference]: With dead ends: 16 [2018-10-02 11:54:44,032 INFO L226 Difference]: Without dead ends: 14 [2018-10-02 11:54:44,032 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-02 11:54:44,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-02 11:54:44,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-02 11:54:44,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-02 11:54:44,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-02 11:54:44,035 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2018-10-02 11:54:44,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:44,036 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-02 11:54:44,036 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-02 11:54:44,036 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-02 11:54:44,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-02 11:54:44,036 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:44,036 INFO L375 BasicCegarLoop]: trace histogram [10, 1, 1, 1] [2018-10-02 11:54:44,037 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:44,037 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:44,037 INFO L82 PathProgramCache]: Analyzing trace with hash -258347744, now seen corresponding path program 10 times [2018-10-02 11:54:44,037 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:44,037 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:44,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:44,038 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:54:44,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:44,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:44,275 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:44,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:44,276 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 [2018-10-02 11:54:44,285 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:54:44,317 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:54:44,317 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:54:44,319 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:44,327 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:44,357 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:44,357 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-02 11:54:44,358 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-02 11:54:44,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-02 11:54:44,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-02 11:54:44,362 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 13 states. [2018-10-02 11:54:44,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:44,410 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-10-02 11:54:44,410 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-02 11:54:44,411 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 13 [2018-10-02 11:54:44,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:44,411 INFO L225 Difference]: With dead ends: 17 [2018-10-02 11:54:44,411 INFO L226 Difference]: Without dead ends: 15 [2018-10-02 11:54:44,412 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-02 11:54:44,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-02 11:54:44,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-02 11:54:44,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-02 11:54:44,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-02 11:54:44,416 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2018-10-02 11:54:44,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:44,416 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-02 11:54:44,416 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-02 11:54:44,417 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-02 11:54:44,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-02 11:54:44,417 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:44,417 INFO L375 BasicCegarLoop]: trace histogram [11, 1, 1, 1] [2018-10-02 11:54:44,418 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:44,418 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:44,418 INFO L82 PathProgramCache]: Analyzing trace with hash 581150662, now seen corresponding path program 11 times [2018-10-02 11:54:44,418 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:44,418 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:44,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:44,419 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:54:44,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:44,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:44,705 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:44,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:44,706 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 [2018-10-02 11:54:44,714 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:54:47,187 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-10-02 11:54:47,187 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:54:47,191 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:47,199 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:47,224 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:47,224 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-02 11:54:47,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-02 11:54:47,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-02 11:54:47,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-02 11:54:47,225 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 14 states. [2018-10-02 11:54:47,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:47,263 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-10-02 11:54:47,263 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-02 11:54:47,264 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2018-10-02 11:54:47,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:47,264 INFO L225 Difference]: With dead ends: 18 [2018-10-02 11:54:47,264 INFO L226 Difference]: Without dead ends: 16 [2018-10-02 11:54:47,265 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 [2018-10-02 11:54:47,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-02 11:54:47,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-02 11:54:47,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-02 11:54:47,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-02 11:54:47,269 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2018-10-02 11:54:47,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:47,269 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-02 11:54:47,269 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-02 11:54:47,269 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-02 11:54:47,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-02 11:54:47,270 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:47,270 INFO L375 BasicCegarLoop]: trace histogram [12, 1, 1, 1] [2018-10-02 11:54:47,270 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:47,271 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:47,271 INFO L82 PathProgramCache]: Analyzing trace with hash 835797472, now seen corresponding path program 12 times [2018-10-02 11:54:47,271 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:47,271 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:47,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:47,272 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:54:47,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:47,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:47,493 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:47,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:47,494 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 [2018-10-02 11:54:47,502 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:54:47,535 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-02 11:54:47,535 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:54:47,538 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:47,548 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:47,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:47,570 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-02 11:54:47,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-02 11:54:47,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-02 11:54:47,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-02 11:54:47,572 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 15 states. [2018-10-02 11:54:47,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:47,605 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-02 11:54:47,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-02 11:54:47,605 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 15 [2018-10-02 11:54:47,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:47,606 INFO L225 Difference]: With dead ends: 19 [2018-10-02 11:54:47,606 INFO L226 Difference]: Without dead ends: 17 [2018-10-02 11:54:47,607 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-02 11:54:47,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-10-02 11:54:47,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-10-02 11:54:47,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-02 11:54:47,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-02 11:54:47,611 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2018-10-02 11:54:47,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:47,611 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-02 11:54:47,611 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-02 11:54:47,611 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-02 11:54:47,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-02 11:54:47,612 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:47,612 INFO L375 BasicCegarLoop]: trace histogram [13, 1, 1, 1] [2018-10-02 11:54:47,612 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:47,612 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:47,613 INFO L82 PathProgramCache]: Analyzing trace with hash 139913990, now seen corresponding path program 13 times [2018-10-02 11:54:47,613 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:47,613 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:47,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:47,614 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:54:47,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:47,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:48,006 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:48,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:48,007 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 [2018-10-02 11:54:48,017 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:54:48,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:48,030 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:48,039 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:48,063 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:48,064 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-02 11:54:48,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-02 11:54:48,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-02 11:54:48,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-02 11:54:48,065 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 16 states. [2018-10-02 11:54:48,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:48,303 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-10-02 11:54:48,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-02 11:54:48,304 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 16 [2018-10-02 11:54:48,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:48,305 INFO L225 Difference]: With dead ends: 20 [2018-10-02 11:54:48,305 INFO L226 Difference]: Without dead ends: 18 [2018-10-02 11:54:48,305 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-02 11:54:48,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-02 11:54:48,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-02 11:54:48,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-02 11:54:48,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-02 11:54:48,308 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2018-10-02 11:54:48,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:48,309 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-02 11:54:48,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-02 11:54:48,309 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-02 11:54:48,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-02 11:54:48,310 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:48,310 INFO L375 BasicCegarLoop]: trace histogram [14, 1, 1, 1] [2018-10-02 11:54:48,310 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:48,310 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:48,311 INFO L82 PathProgramCache]: Analyzing trace with hash 42362528, now seen corresponding path program 14 times [2018-10-02 11:54:48,311 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:48,311 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:48,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:48,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:54:48,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:48,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:48,607 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:48,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:48,608 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 [2018-10-02 11:54:48,624 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:54:48,649 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:54:48,649 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:54:48,652 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:48,661 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:48,683 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:48,683 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-02 11:54:48,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-02 11:54:48,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-02 11:54:48,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-02 11:54:48,684 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 17 states. [2018-10-02 11:54:48,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:48,741 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-02 11:54:48,741 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-02 11:54:48,741 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 17 [2018-10-02 11:54:48,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:48,742 INFO L225 Difference]: With dead ends: 21 [2018-10-02 11:54:48,742 INFO L226 Difference]: Without dead ends: 19 [2018-10-02 11:54:48,743 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 [2018-10-02 11:54:48,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-02 11:54:48,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-02 11:54:48,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-02 11:54:48,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-10-02 11:54:48,747 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2018-10-02 11:54:48,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:48,747 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-10-02 11:54:48,747 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-02 11:54:48,747 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-10-02 11:54:48,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-02 11:54:48,748 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:48,748 INFO L375 BasicCegarLoop]: trace histogram [15, 1, 1, 1] [2018-10-02 11:54:48,748 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:48,749 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:48,749 INFO L82 PathProgramCache]: Analyzing trace with hash 1313234502, now seen corresponding path program 15 times [2018-10-02 11:54:48,749 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:48,749 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:48,750 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:48,750 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:54:48,750 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:48,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:49,042 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:49,042 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:49,042 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 [2018-10-02 11:54:49,052 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:54:51,574 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-02 11:54:51,574 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:54:51,576 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:51,586 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:51,609 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:51,609 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-02 11:54:51,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-02 11:54:51,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-02 11:54:51,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-02 11:54:51,610 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 18 states. [2018-10-02 11:54:51,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:51,655 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-02 11:54:51,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-02 11:54:51,655 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 18 [2018-10-02 11:54:51,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:51,656 INFO L225 Difference]: With dead ends: 22 [2018-10-02 11:54:51,656 INFO L226 Difference]: Without dead ends: 20 [2018-10-02 11:54:51,657 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 [2018-10-02 11:54:51,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-02 11:54:51,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-02 11:54:51,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-02 11:54:51,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-02 11:54:51,660 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2018-10-02 11:54:51,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:51,661 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-02 11:54:51,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-02 11:54:51,661 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-02 11:54:51,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-02 11:54:51,661 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:51,661 INFO L375 BasicCegarLoop]: trace histogram [16, 1, 1, 1] [2018-10-02 11:54:51,662 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:51,662 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:51,662 INFO L82 PathProgramCache]: Analyzing trace with hash 2055560032, now seen corresponding path program 16 times [2018-10-02 11:54:51,662 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:51,662 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:51,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:51,663 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:54:51,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:51,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:51,962 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:51,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:51,962 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 [2018-10-02 11:54:51,972 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:54:51,996 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:54:51,996 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:54:51,997 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:54:52,006 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:52,028 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:54:52,028 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-02 11:54:52,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-02 11:54:52,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-02 11:54:52,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-02 11:54:52,029 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 19 states. [2018-10-02 11:54:52,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:52,073 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-02 11:54:52,074 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-02 11:54:52,074 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 19 [2018-10-02 11:54:52,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:52,075 INFO L225 Difference]: With dead ends: 23 [2018-10-02 11:54:52,075 INFO L226 Difference]: Without dead ends: 21 [2018-10-02 11:54:52,076 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-02 11:54:52,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-02 11:54:52,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-02 11:54:52,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-02 11:54:52,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-02 11:54:52,080 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2018-10-02 11:54:52,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:52,080 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-02 11:54:52,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-02 11:54:52,080 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-02 11:54:52,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-02 11:54:52,081 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:52,081 INFO L375 BasicCegarLoop]: trace histogram [17, 1, 1, 1] [2018-10-02 11:54:52,081 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:52,081 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:52,081 INFO L82 PathProgramCache]: Analyzing trace with hash -702152314, now seen corresponding path program 17 times [2018-10-02 11:54:52,082 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:52,082 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:52,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:52,083 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:54:52,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:52,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:52,646 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:54:52,646 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:52,646 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 [2018-10-02 11:54:52,657 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:55:42,759 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2018-10-02 11:55:42,760 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:55:43,744 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:55:43,754 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:55:43,760 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:55:43,760 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-02 11:55:43,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-02 11:55:43,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-02 11:55:43,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-02 11:55:43,762 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 20 states. [2018-10-02 11:55:43,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:55:43,872 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-02 11:55:43,872 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-02 11:55:43,872 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 20 [2018-10-02 11:55:43,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:55:43,873 INFO L225 Difference]: With dead ends: 24 [2018-10-02 11:55:43,873 INFO L226 Difference]: Without dead ends: 22 [2018-10-02 11:55:43,873 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-02 11:55:43,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-02 11:55:43,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-02 11:55:43,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-02 11:55:43,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-02 11:55:43,878 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2018-10-02 11:55:43,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:55:43,878 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-02 11:55:43,878 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-02 11:55:43,878 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-02 11:55:43,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-02 11:55:43,881 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:55:43,881 INFO L375 BasicCegarLoop]: trace histogram [18, 1, 1, 1] [2018-10-02 11:55:43,881 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:55:43,881 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:55:43,882 INFO L82 PathProgramCache]: Analyzing trace with hash -291889120, now seen corresponding path program 18 times [2018-10-02 11:55:43,882 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:55:43,882 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:55:43,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:55:43,883 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:55:43,883 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:55:43,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:55:44,235 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:55:44,235 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:55:44,236 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 [2018-10-02 11:55:44,245 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:55:46,174 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2018-10-02 11:55:46,174 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:55:46,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:55:46,192 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:55:46,223 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:55:46,223 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2018-10-02 11:55:46,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-02 11:55:46,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-02 11:55:46,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-02 11:55:46,224 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 21 states. [2018-10-02 11:55:46,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:55:46,274 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-02 11:55:46,275 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-02 11:55:46,275 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 21 [2018-10-02 11:55:46,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:55:46,275 INFO L225 Difference]: With dead ends: 25 [2018-10-02 11:55:46,275 INFO L226 Difference]: Without dead ends: 23 [2018-10-02 11:55:46,276 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-02 11:55:46,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-02 11:55:46,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-10-02 11:55:46,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-02 11:55:46,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-02 11:55:46,280 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2018-10-02 11:55:46,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:55:46,280 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-02 11:55:46,280 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-02 11:55:46,280 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-02 11:55:46,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-02 11:55:46,281 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:55:46,281 INFO L375 BasicCegarLoop]: trace histogram [19, 1, 1, 1] [2018-10-02 11:55:46,281 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:55:46,282 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:55:46,282 INFO L82 PathProgramCache]: Analyzing trace with hash -458631994, now seen corresponding path program 19 times [2018-10-02 11:55:46,282 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:55:46,282 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:55:46,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:55:46,283 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:55:46,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:55:46,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:55:46,513 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:55:46,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:55:46,513 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 [2018-10-02 11:55:46,522 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:55:46,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:55:46,551 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:55:46,561 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:55:46,592 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:55:46,592 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-10-02 11:55:46,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-02 11:55:46,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-02 11:55:46,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-02 11:55:46,594 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 22 states. [2018-10-02 11:55:46,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:55:46,660 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-10-02 11:55:46,660 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-02 11:55:46,661 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 22 [2018-10-02 11:55:46,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:55:46,661 INFO L225 Difference]: With dead ends: 26 [2018-10-02 11:55:46,661 INFO L226 Difference]: Without dead ends: 24 [2018-10-02 11:55:46,662 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 [2018-10-02 11:55:46,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-02 11:55:46,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-02 11:55:46,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-02 11:55:46,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-02 11:55:46,665 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2018-10-02 11:55:46,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:55:46,666 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-02 11:55:46,666 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-02 11:55:46,666 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-02 11:55:46,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-02 11:55:46,666 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:55:46,667 INFO L375 BasicCegarLoop]: trace histogram [20, 1, 1, 1] [2018-10-02 11:55:46,667 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:55:46,667 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:55:46,667 INFO L82 PathProgramCache]: Analyzing trace with hash -1332693792, now seen corresponding path program 20 times [2018-10-02 11:55:46,667 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:55:46,667 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:55:46,668 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:55:46,668 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:55:46,668 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:55:46,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:55:47,080 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:55:47,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:55:47,080 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 [2018-10-02 11:55:47,089 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:55:47,117 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:55:47,118 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:55:47,120 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:55:47,130 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:55:47,159 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:55:47,160 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-10-02 11:55:47,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-02 11:55:47,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-02 11:55:47,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-02 11:55:47,161 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 23 states. [2018-10-02 11:55:47,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:55:47,302 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-02 11:55:47,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-02 11:55:47,303 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 23 [2018-10-02 11:55:47,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:55:47,304 INFO L225 Difference]: With dead ends: 27 [2018-10-02 11:55:47,304 INFO L226 Difference]: Without dead ends: 25 [2018-10-02 11:55:47,305 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 [2018-10-02 11:55:47,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-02 11:55:47,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-02 11:55:47,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-02 11:55:47,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-10-02 11:55:47,308 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2018-10-02 11:55:47,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:55:47,309 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-10-02 11:55:47,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-02 11:55:47,309 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-10-02 11:55:47,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-02 11:55:47,310 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:55:47,310 INFO L375 BasicCegarLoop]: trace histogram [21, 1, 1, 1] [2018-10-02 11:55:47,310 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:55:47,310 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:55:47,310 INFO L82 PathProgramCache]: Analyzing trace with hash 1636161542, now seen corresponding path program 21 times [2018-10-02 11:55:47,311 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:55:47,311 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:55:47,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:55:47,312 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:55:47,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:55:47,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:55:47,650 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:55:47,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:55:47,650 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 [2018-10-02 11:55:47,659 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:56:17,883 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-02 11:56:17,883 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:56:17,888 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:56:17,898 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:56:17,929 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:56:17,929 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-10-02 11:56:17,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-02 11:56:17,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-02 11:56:17,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-02 11:56:17,930 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 24 states. [2018-10-02 11:56:17,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:56:17,998 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-10-02 11:56:17,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-02 11:56:17,999 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 24 [2018-10-02 11:56:18,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:56:18,000 INFO L225 Difference]: With dead ends: 28 [2018-10-02 11:56:18,000 INFO L226 Difference]: Without dead ends: 26 [2018-10-02 11:56:18,001 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 [2018-10-02 11:56:18,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-02 11:56:18,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-02 11:56:18,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-02 11:56:18,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-02 11:56:18,004 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2018-10-02 11:56:18,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:56:18,005 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-02 11:56:18,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-02 11:56:18,005 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-02 11:56:18,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-02 11:56:18,006 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:56:18,006 INFO L375 BasicCegarLoop]: trace histogram [22, 1, 1, 1] [2018-10-02 11:56:18,006 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:56:18,006 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:56:18,006 INFO L82 PathProgramCache]: Analyzing trace with hash -818603616, now seen corresponding path program 22 times [2018-10-02 11:56:18,006 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:56:18,006 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:56:18,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:56:18,007 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:56:18,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:56:18,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:56:18,380 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:56:18,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:56:18,380 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 [2018-10-02 11:56:18,390 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:56:18,409 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:56:18,409 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:56:18,411 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:56:18,422 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:56:18,451 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:56:18,451 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 24 [2018-10-02 11:56:18,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-02 11:56:18,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-02 11:56:18,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-02 11:56:18,453 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 25 states. [2018-10-02 11:56:18,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:56:18,510 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-02 11:56:18,510 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-02 11:56:18,511 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 25 [2018-10-02 11:56:18,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:56:18,511 INFO L225 Difference]: With dead ends: 29 [2018-10-02 11:56:18,511 INFO L226 Difference]: Without dead ends: 27 [2018-10-02 11:56:18,512 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 [2018-10-02 11:56:18,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-02 11:56:18,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-10-02 11:56:18,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-02 11:56:18,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-02 11:56:18,515 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2018-10-02 11:56:18,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:56:18,515 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-02 11:56:18,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-02 11:56:18,516 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-02 11:56:18,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-02 11:56:18,516 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:56:18,516 INFO L375 BasicCegarLoop]: trace histogram [23, 1, 1, 1] [2018-10-02 11:56:18,517 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:56:18,517 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:56:18,517 INFO L82 PathProgramCache]: Analyzing trace with hash 393087814, now seen corresponding path program 23 times [2018-10-02 11:56:18,517 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:56:18,517 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:56:18,518 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:56:18,518 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:56:18,518 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:56:18,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:56:18,946 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:56:18,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:56:18,947 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 [2018-10-02 11:56:18,956 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:57:35,247 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2018-10-02 11:57:35,247 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:57:35,684 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:35,696 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:35,727 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:57:35,728 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-10-02 11:57:35,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-02 11:57:35,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-02 11:57:35,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-02 11:57:35,729 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 26 states. [2018-10-02 11:57:35,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:35,824 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-02 11:57:35,824 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-02 11:57:35,824 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 26 [2018-10-02 11:57:35,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:35,825 INFO L225 Difference]: With dead ends: 30 [2018-10-02 11:57:35,825 INFO L226 Difference]: Without dead ends: 28 [2018-10-02 11:57:35,826 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-02 11:57:35,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-02 11:57:35,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-02 11:57:35,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-02 11:57:35,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-02 11:57:35,830 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2018-10-02 11:57:35,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:35,830 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-02 11:57:35,830 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-02 11:57:35,830 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-02 11:57:35,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-02 11:57:35,831 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:35,831 INFO L375 BasicCegarLoop]: trace histogram [24, 1, 1, 1] [2018-10-02 11:57:35,831 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:57:35,831 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:35,832 INFO L82 PathProgramCache]: Analyzing trace with hash -699183520, now seen corresponding path program 24 times [2018-10-02 11:57:35,832 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:35,832 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:35,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:35,833 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:57:35,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:35,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:57:36,599 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:36,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:57:36,599 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 [2018-10-02 11:57:36,607 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:57:44,351 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-02 11:57:44,352 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:57:44,370 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:44,379 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:44,403 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:57:44,404 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 26 [2018-10-02 11:57:44,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-02 11:57:44,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-02 11:57:44,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-02 11:57:44,405 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 27 states. [2018-10-02 11:57:44,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:44,453 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-02 11:57:44,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-02 11:57:44,453 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 27 [2018-10-02 11:57:44,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:44,454 INFO L225 Difference]: With dead ends: 31 [2018-10-02 11:57:44,454 INFO L226 Difference]: Without dead ends: 29 [2018-10-02 11:57:44,455 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-02 11:57:44,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-02 11:57:44,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-02 11:57:44,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-02 11:57:44,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-02 11:57:44,458 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2018-10-02 11:57:44,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:44,459 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-02 11:57:44,459 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-02 11:57:44,459 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-02 11:57:44,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-02 11:57:44,459 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:44,459 INFO L375 BasicCegarLoop]: trace histogram [25, 1, 1, 1] [2018-10-02 11:57:44,460 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:57:44,460 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:44,460 INFO L82 PathProgramCache]: Analyzing trace with hash -199856506, now seen corresponding path program 25 times [2018-10-02 11:57:44,460 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:44,460 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:44,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:44,461 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:57:44,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:44,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:57:45,019 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:45,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:57:45,020 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 [2018-10-02 11:57:45,030 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:57:45,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:57:45,051 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:45,060 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:45,083 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:57:45,084 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 27 [2018-10-02 11:57:45,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-02 11:57:45,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-02 11:57:45,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-02 11:57:45,085 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 28 states. [2018-10-02 11:57:45,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:45,126 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-10-02 11:57:45,126 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-02 11:57:45,126 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 28 [2018-10-02 11:57:45,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:45,127 INFO L225 Difference]: With dead ends: 32 [2018-10-02 11:57:45,127 INFO L226 Difference]: Without dead ends: 30 [2018-10-02 11:57:45,128 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 [2018-10-02 11:57:45,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-02 11:57:45,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-02 11:57:45,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-02 11:57:45,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-02 11:57:45,131 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2018-10-02 11:57:45,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:45,131 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-02 11:57:45,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-02 11:57:45,132 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-02 11:57:45,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-02 11:57:45,132 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:45,132 INFO L375 BasicCegarLoop]: trace histogram [26, 1, 1, 1] [2018-10-02 11:57:45,133 INFO L423 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:57:45,133 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:45,133 INFO L82 PathProgramCache]: Analyzing trace with hash -1900588256, now seen corresponding path program 26 times [2018-10-02 11:57:45,133 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:45,133 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:45,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:45,134 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:57:45,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:45,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:57:46,222 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:46,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:57:46,222 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 [2018-10-02 11:57:46,231 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:57:46,249 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:57:46,249 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:57:46,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:46,261 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:46,285 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:57:46,285 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 28 [2018-10-02 11:57:46,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-02 11:57:46,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-02 11:57:46,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-02 11:57:46,287 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 29 states. [2018-10-02 11:57:46,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:46,460 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-02 11:57:46,460 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-02 11:57:46,460 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 29 [2018-10-02 11:57:46,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:46,460 INFO L225 Difference]: With dead ends: 33 [2018-10-02 11:57:46,461 INFO L226 Difference]: Without dead ends: 31 [2018-10-02 11:57:46,461 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 [2018-10-02 11:57:46,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-02 11:57:46,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-10-02 11:57:46,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-02 11:57:46,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-10-02 11:57:46,464 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2018-10-02 11:57:46,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:46,465 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-10-02 11:57:46,465 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-02 11:57:46,465 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-10-02 11:57:46,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-02 11:57:46,465 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:46,466 INFO L375 BasicCegarLoop]: trace histogram [27, 1, 1, 1] [2018-10-02 11:57:46,466 INFO L423 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:57:46,466 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:46,466 INFO L82 PathProgramCache]: Analyzing trace with hash 1211302342, now seen corresponding path program 27 times [2018-10-02 11:57:46,466 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:46,466 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:46,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:46,467 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:57:46,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:46,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:57:47,280 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:47,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:57:47,280 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 [2018-10-02 11:57:47,289 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:58:34,350 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-02 11:58:34,350 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:34,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:34,380 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:34,410 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:58:34,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 29 [2018-10-02 11:58:34,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-02 11:58:34,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-02 11:58:34,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-02 11:58:34,411 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 30 states. [2018-10-02 11:58:34,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:34,444 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-10-02 11:58:34,445 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-02 11:58:34,445 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 30 [2018-10-02 11:58:34,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:34,445 INFO L225 Difference]: With dead ends: 34 [2018-10-02 11:58:34,446 INFO L226 Difference]: Without dead ends: 32 [2018-10-02 11:58:34,446 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-02 11:58:34,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-02 11:58:34,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-02 11:58:34,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-02 11:58:34,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-02 11:58:34,451 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2018-10-02 11:58:34,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:34,451 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-02 11:58:34,451 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-02 11:58:34,452 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-02 11:58:34,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-02 11:58:34,452 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:34,452 INFO L375 BasicCegarLoop]: trace histogram [28, 1, 1, 1] [2018-10-02 11:58:34,452 INFO L423 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:58:34,453 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:34,453 INFO L82 PathProgramCache]: Analyzing trace with hash -1104336928, now seen corresponding path program 28 times [2018-10-02 11:58:34,453 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:34,453 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:34,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:34,454 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:34,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:34,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:58:35,939 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:35,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:58:35,940 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 [2018-10-02 11:58:35,949 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:58:35,970 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:58:35,971 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:35,972 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:35,982 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:36,013 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:58:36,013 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 30 [2018-10-02 11:58:36,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-02 11:58:36,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-02 11:58:36,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-02 11:58:36,014 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 31 states. [2018-10-02 11:58:36,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:36,111 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-02 11:58:36,112 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-02 11:58:36,112 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 31 [2018-10-02 11:58:36,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:36,113 INFO L225 Difference]: With dead ends: 35 [2018-10-02 11:58:36,113 INFO L226 Difference]: Without dead ends: 33 [2018-10-02 11:58:36,114 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-02 11:58:36,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-02 11:58:36,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-02 11:58:36,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-02 11:58:36,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-02 11:58:36,117 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2018-10-02 11:58:36,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:36,118 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-02 11:58:36,118 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-02 11:58:36,118 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-02 11:58:36,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-02 11:58:36,118 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:36,119 INFO L375 BasicCegarLoop]: trace histogram [29, 1, 1, 1] [2018-10-02 11:58:36,119 INFO L423 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:58:36,119 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:36,119 INFO L82 PathProgramCache]: Analyzing trace with hash 125289734, now seen corresponding path program 29 times [2018-10-02 11:58:36,119 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:36,119 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:36,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:36,120 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:36,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:36,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:58:37,170 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:37,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:58:37,171 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 [2018-10-02 11:58:37,179 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown