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 0.1.23-4eac566 [2018-09-23 19:50:25,722 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-23 19:50:25,725 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-23 19:50:25,743 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-23 19:50:25,743 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-23 19:50:25,745 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-23 19:50:25,746 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-23 19:50:25,748 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-23 19:50:25,751 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-23 19:50:25,758 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-23 19:50:25,759 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-23 19:50:25,759 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-23 19:50:25,760 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-23 19:50:25,763 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-23 19:50:25,765 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-23 19:50:25,766 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-23 19:50:25,767 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-23 19:50:25,771 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-23 19:50:25,773 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-23 19:50:25,776 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-23 19:50:25,778 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-23 19:50:25,780 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-23 19:50:25,782 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-09-23 19:50:25,796 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 [2018-09-23 19:50:25,823 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-23 19:50:25,823 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-23 19:50:25,824 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-23 19:50:25,824 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-23 19:50:25,825 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-23 19:50:25,825 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-23 19:50:25,825 INFO L133 SettingsManager]: * Use SBE=true [2018-09-23 19:50:25,825 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-23 19:50:25,826 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-23 19:50:25,826 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-23 19:50:25,827 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-23 19:50:25,827 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-23 19:50:25,827 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-23 19:50:25,827 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-23 19:50:25,827 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-23 19:50:25,827 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-23 19:50:25,828 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-23 19:50:25,828 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-23 19:50:25,828 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-23 19:50:25,828 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-23 19:50:25,829 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-23 19:50:25,830 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-23 19:50:25,830 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-23 19:50:25,830 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-23 19:50:25,830 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-23 19:50:25,830 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-23 19:50:25,831 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-23 19:50:25,831 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-23 19:50:25,831 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-23 19:50:25,831 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-23 19:50:25,883 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-23 19:50:25,895 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-23 19:50:25,899 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-23 19:50:25,901 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-23 19:50:25,901 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-23 19:50:25,902 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/NeonAngel01.bpl [2018-09-23 19:50:25,902 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/NeonAngel01.bpl' [2018-09-23 19:50:25,956 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-23 19:50:25,959 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-23 19:50:25,960 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-23 19:50:25,960 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-23 19:50:25,960 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-23 19:50:25,981 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:50:25" (1/1) ... [2018-09-23 19:50:25,994 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:50:25" (1/1) ... [2018-09-23 19:50:25,998 WARN L165 Inliner]: Program contained no entry procedure! [2018-09-23 19:50:25,999 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2018-09-23 19:50:25,999 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2018-09-23 19:50:26,001 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-23 19:50:26,002 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-23 19:50:26,002 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-23 19:50:26,002 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-23 19:50:26,014 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:50:25" (1/1) ... [2018-09-23 19:50:26,014 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:50:25" (1/1) ... [2018-09-23 19:50:26,014 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:50:25" (1/1) ... [2018-09-23 19:50:26,015 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:50:25" (1/1) ... [2018-09-23 19:50:26,017 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:50:25" (1/1) ... [2018-09-23 19:50:26,021 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:50:25" (1/1) ... [2018-09-23 19:50:26,021 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:50:25" (1/1) ... [2018-09-23 19:50:26,023 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-23 19:50:26,023 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-23 19:50:26,023 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-23 19:50:26,023 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-23 19:50:26,024 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:50:25" (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 [2018-09-23 19:50:26,088 INFO L124 BoogieDeclarations]: Specification and implementation of procedure main given in one single declaration [2018-09-23 19:50:26,088 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-09-23 19:50:26,088 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-09-23 19:50:26,296 INFO L351 CfgBuilder]: Using library mode [2018-09-23 19:50:26,296 INFO L202 PluginConnector]: Adding new model NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.09 07:50:26 BoogieIcfgContainer [2018-09-23 19:50:26,296 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-23 19:50:26,298 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-23 19:50:26,298 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-23 19:50:26,302 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-23 19:50:26,302 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:50:25" (1/2) ... [2018-09-23 19:50:26,303 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3858e5a1 and model type NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.09 07:50:26, skipping insertion in model container [2018-09-23 19:50:26,303 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.09 07:50:26" (2/2) ... [2018-09-23 19:50:26,306 INFO L112 eAbstractionObserver]: Analyzing ICFG NeonAngel01.bpl [2018-09-23 19:50:26,318 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-23 19:50:26,329 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-23 19:50:26,385 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-23 19:50:26,386 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-23 19:50:26,386 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-23 19:50:26,386 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-23 19:50:26,387 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-23 19:50:26,387 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-23 19:50:26,387 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-23 19:50:26,387 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-23 19:50:26,387 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-23 19:50:26,408 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-09-23 19:50:26,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-09-23 19:50:26,415 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:26,416 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-09-23 19:50:26,417 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:26,424 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:26,424 INFO L82 PathProgramCache]: Analyzing trace with hash 30048, now seen corresponding path program 1 times [2018-09-23 19:50:26,426 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:26,427 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:26,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:26,483 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:50:26,484 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:26,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:26,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:26,584 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-23 19:50:26,585 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-23 19:50:26,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-23 19:50:26,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-23 19:50:26,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-23 19:50:26,605 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-09-23 19:50:26,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:26,679 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2018-09-23 19:50:26,681 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-23 19:50:26,683 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-09-23 19:50:26,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:26,699 INFO L225 Difference]: With dead ends: 13 [2018-09-23 19:50:26,700 INFO L226 Difference]: Without dead ends: 5 [2018-09-23 19:50:26,706 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 [2018-09-23 19:50:26,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-09-23 19:50:26,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-09-23 19:50:26,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-09-23 19:50:26,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 5 transitions. [2018-09-23 19:50:26,749 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 5 transitions. Word has length 3 [2018-09-23 19:50:26,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:26,749 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 5 transitions. [2018-09-23 19:50:26,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-23 19:50:26,750 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-09-23 19:50:26,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-23 19:50:26,750 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:26,750 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-23 19:50:26,750 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:26,751 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:26,751 INFO L82 PathProgramCache]: Analyzing trace with hash 927622, now seen corresponding path program 1 times [2018-09-23 19:50:26,751 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:26,751 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:26,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:26,752 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:50:26,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:26,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:26,895 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:26,895 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:26,896 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 19:50:26,914 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:50:26,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:26,933 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:26,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:26,976 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:26,976 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-09-23 19:50:26,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-23 19:50:26,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-23 19:50:26,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-09-23 19:50:26,978 INFO L87 Difference]: Start difference. First operand 5 states and 5 transitions. Second operand 4 states. [2018-09-23 19:50:27,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:27,020 INFO L93 Difference]: Finished difference Result 8 states and 8 transitions. [2018-09-23 19:50:27,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-23 19:50:27,021 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2018-09-23 19:50:27,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:27,021 INFO L225 Difference]: With dead ends: 8 [2018-09-23 19:50:27,021 INFO L226 Difference]: Without dead ends: 6 [2018-09-23 19:50:27,022 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 [2018-09-23 19:50:27,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2018-09-23 19:50:27,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2018-09-23 19:50:27,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-09-23 19:50:27,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2018-09-23 19:50:27,025 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2018-09-23 19:50:27,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:27,025 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2018-09-23 19:50:27,025 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-23 19:50:27,026 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2018-09-23 19:50:27,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-09-23 19:50:27,026 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:27,026 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2018-09-23 19:50:27,027 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:27,027 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:27,027 INFO L82 PathProgramCache]: Analyzing trace with hash 28752416, now seen corresponding path program 2 times [2018-09-23 19:50:27,027 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:27,027 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:27,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:27,029 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:50:27,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:27,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:27,096 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:27,097 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:27,097 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 [2018-09-23 19:50:27,108 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 19:50:27,126 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 19:50:27,127 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:50:27,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:27,136 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:27,156 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:27,157 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-09-23 19:50:27,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-23 19:50:27,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-23 19:50:27,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-09-23 19:50:27,158 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 5 states. [2018-09-23 19:50:27,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:27,193 INFO L93 Difference]: Finished difference Result 9 states and 9 transitions. [2018-09-23 19:50:27,194 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-23 19:50:27,194 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2018-09-23 19:50:27,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:27,195 INFO L225 Difference]: With dead ends: 9 [2018-09-23 19:50:27,195 INFO L226 Difference]: Without dead ends: 7 [2018-09-23 19:50:27,196 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 [2018-09-23 19:50:27,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-09-23 19:50:27,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-09-23 19:50:27,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-09-23 19:50:27,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-09-23 19:50:27,199 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 5 [2018-09-23 19:50:27,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:27,200 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-09-23 19:50:27,200 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-23 19:50:27,200 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-09-23 19:50:27,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-23 19:50:27,201 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:27,201 INFO L375 BasicCegarLoop]: trace histogram [3, 1, 1, 1] [2018-09-23 19:50:27,201 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:27,201 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:27,202 INFO L82 PathProgramCache]: Analyzing trace with hash 891321030, now seen corresponding path program 3 times [2018-09-23 19:50:27,202 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:27,202 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:27,203 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:27,203 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:50:27,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:27,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:27,302 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:27,302 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:27,302 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-23 19:50:27,315 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 19:50:27,330 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-09-23 19:50:27,331 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:50:27,332 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:27,339 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:27,364 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:27,364 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-09-23 19:50:27,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-23 19:50:27,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-23 19:50:27,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-09-23 19:50:27,366 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 6 states. [2018-09-23 19:50:27,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:27,422 INFO L93 Difference]: Finished difference Result 10 states and 10 transitions. [2018-09-23 19:50:27,423 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-23 19:50:27,424 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2018-09-23 19:50:27,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:27,424 INFO L225 Difference]: With dead ends: 10 [2018-09-23 19:50:27,425 INFO L226 Difference]: Without dead ends: 8 [2018-09-23 19:50:27,425 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 [2018-09-23 19:50:27,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-09-23 19:50:27,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-09-23 19:50:27,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-09-23 19:50:27,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-09-23 19:50:27,428 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-09-23 19:50:27,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:27,429 INFO L480 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-09-23 19:50:27,429 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-23 19:50:27,429 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-09-23 19:50:27,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-09-23 19:50:27,429 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:27,430 INFO L375 BasicCegarLoop]: trace histogram [4, 1, 1, 1] [2018-09-23 19:50:27,430 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:27,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:27,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1861144288, now seen corresponding path program 4 times [2018-09-23 19:50:27,431 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:27,431 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:27,432 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:27,432 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:50:27,432 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:27,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:27,699 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:27,699 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:27,699 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 [2018-09-23 19:50:27,715 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 19:50:27,747 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 19:50:27,747 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:50:27,749 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:27,755 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:27,776 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:27,776 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-23 19:50:27,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-23 19:50:27,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-23 19:50:27,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-09-23 19:50:27,777 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 7 states. [2018-09-23 19:50:27,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:27,812 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-09-23 19:50:27,813 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-23 19:50:27,813 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2018-09-23 19:50:27,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:27,813 INFO L225 Difference]: With dead ends: 11 [2018-09-23 19:50:27,814 INFO L226 Difference]: Without dead ends: 9 [2018-09-23 19:50:27,814 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 [2018-09-23 19:50:27,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-23 19:50:27,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-23 19:50:27,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-23 19:50:27,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-09-23 19:50:27,819 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2018-09-23 19:50:27,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:27,820 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-09-23 19:50:27,820 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-23 19:50:27,820 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-09-23 19:50:27,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-23 19:50:27,821 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:27,821 INFO L375 BasicCegarLoop]: trace histogram [5, 1, 1, 1] [2018-09-23 19:50:27,821 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:27,822 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:27,822 INFO L82 PathProgramCache]: Analyzing trace with hash 1860894214, now seen corresponding path program 5 times [2018-09-23 19:50:27,822 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:27,822 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:27,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:27,823 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:50:27,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:27,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:27,963 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:27,963 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:27,963 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 [2018-09-23 19:50:27,980 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 19:50:28,031 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2018-09-23 19:50:28,033 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:50:28,036 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:28,051 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:28,078 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:28,079 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-09-23 19:50:28,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-23 19:50:28,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-23 19:50:28,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-09-23 19:50:28,080 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 8 states. [2018-09-23 19:50:28,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:28,117 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2018-09-23 19:50:28,117 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-23 19:50:28,118 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 8 [2018-09-23 19:50:28,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:28,118 INFO L225 Difference]: With dead ends: 12 [2018-09-23 19:50:28,118 INFO L226 Difference]: Without dead ends: 10 [2018-09-23 19:50:28,119 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 [2018-09-23 19:50:28,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-09-23 19:50:28,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-09-23 19:50:28,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-09-23 19:50:28,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-09-23 19:50:28,123 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2018-09-23 19:50:28,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:28,123 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-09-23 19:50:28,123 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-23 19:50:28,123 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-09-23 19:50:28,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-09-23 19:50:28,124 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:28,124 INFO L375 BasicCegarLoop]: trace histogram [6, 1, 1, 1] [2018-09-23 19:50:28,124 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:28,124 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:28,125 INFO L82 PathProgramCache]: Analyzing trace with hash 1853141920, now seen corresponding path program 6 times [2018-09-23 19:50:28,125 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:28,125 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:28,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:28,126 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:50:28,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:28,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:28,351 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:28,352 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:28,352 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 [2018-09-23 19:50:28,360 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 19:50:28,382 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2018-09-23 19:50:28,382 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:50:28,383 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:28,392 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:28,413 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:28,413 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-09-23 19:50:28,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-23 19:50:28,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-23 19:50:28,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-09-23 19:50:28,414 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 9 states. [2018-09-23 19:50:28,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:28,440 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-09-23 19:50:28,440 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-23 19:50:28,440 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 9 [2018-09-23 19:50:28,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:28,441 INFO L225 Difference]: With dead ends: 13 [2018-09-23 19:50:28,444 INFO L226 Difference]: Without dead ends: 11 [2018-09-23 19:50:28,444 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 [2018-09-23 19:50:28,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-23 19:50:28,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-23 19:50:28,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-23 19:50:28,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-09-23 19:50:28,448 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2018-09-23 19:50:28,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:28,448 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-09-23 19:50:28,448 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-23 19:50:28,448 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-09-23 19:50:28,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-23 19:50:28,449 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:28,449 INFO L375 BasicCegarLoop]: trace histogram [7, 1, 1, 1] [2018-09-23 19:50:28,449 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:28,449 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:28,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1612820806, now seen corresponding path program 7 times [2018-09-23 19:50:28,450 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:28,450 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:28,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:28,451 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:50:28,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:28,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:28,616 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:28,616 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:28,616 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 [2018-09-23 19:50:28,624 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:50:28,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:28,648 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:28,656 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:28,687 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:28,687 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-23 19:50:28,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-23 19:50:28,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-23 19:50:28,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-09-23 19:50:28,689 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 10 states. [2018-09-23 19:50:28,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:28,931 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-09-23 19:50:28,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-23 19:50:28,932 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 10 [2018-09-23 19:50:28,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:28,932 INFO L225 Difference]: With dead ends: 14 [2018-09-23 19:50:28,932 INFO L226 Difference]: Without dead ends: 12 [2018-09-23 19:50:28,933 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 [2018-09-23 19:50:28,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-09-23 19:50:28,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-09-23 19:50:28,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-09-23 19:50:28,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-09-23 19:50:28,936 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-09-23 19:50:28,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:28,937 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-09-23 19:50:28,937 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-23 19:50:28,937 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-09-23 19:50:28,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-09-23 19:50:28,938 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:28,938 INFO L375 BasicCegarLoop]: trace histogram [8, 1, 1, 1] [2018-09-23 19:50:28,938 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:28,938 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:28,938 INFO L82 PathProgramCache]: Analyzing trace with hash -1542166432, now seen corresponding path program 8 times [2018-09-23 19:50:28,939 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:28,939 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:28,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:28,940 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:50:28,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:28,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:29,107 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:29,107 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:29,108 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 [2018-09-23 19:50:29,116 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 19:50:29,127 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 19:50:29,127 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:50:29,129 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:29,137 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:29,158 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:29,158 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-09-23 19:50:29,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-23 19:50:29,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-23 19:50:29,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-09-23 19:50:29,159 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 11 states. [2018-09-23 19:50:29,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:29,199 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-09-23 19:50:29,201 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-23 19:50:29,201 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 11 [2018-09-23 19:50:29,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:29,202 INFO L225 Difference]: With dead ends: 15 [2018-09-23 19:50:29,202 INFO L226 Difference]: Without dead ends: 13 [2018-09-23 19:50:29,203 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 [2018-09-23 19:50:29,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-23 19:50:29,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-23 19:50:29,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-23 19:50:29,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-09-23 19:50:29,205 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2018-09-23 19:50:29,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:29,206 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-09-23 19:50:29,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-23 19:50:29,206 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-09-23 19:50:29,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-09-23 19:50:29,207 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:29,207 INFO L375 BasicCegarLoop]: trace histogram [9, 1, 1, 1] [2018-09-23 19:50:29,207 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:29,207 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:29,207 INFO L82 PathProgramCache]: Analyzing trace with hash -562523002, now seen corresponding path program 9 times [2018-09-23 19:50:29,208 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:29,208 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:29,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:29,209 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:50:29,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:29,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:29,390 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:29,391 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:29,391 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 [2018-09-23 19:50:29,404 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 19:50:29,720 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-09-23 19:50:29,720 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:50:29,722 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:29,733 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:29,756 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:29,757 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-09-23 19:50:29,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-23 19:50:29,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-23 19:50:29,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-09-23 19:50:29,758 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 12 states. [2018-09-23 19:50:29,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:29,802 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-09-23 19:50:29,802 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-23 19:50:29,802 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 12 [2018-09-23 19:50:29,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:29,803 INFO L225 Difference]: With dead ends: 16 [2018-09-23 19:50:29,803 INFO L226 Difference]: Without dead ends: 14 [2018-09-23 19:50:29,804 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-09-23 19:50:29,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-09-23 19:50:29,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-09-23 19:50:29,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-09-23 19:50:29,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-09-23 19:50:29,806 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2018-09-23 19:50:29,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:29,807 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-09-23 19:50:29,807 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-23 19:50:29,807 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-09-23 19:50:29,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-09-23 19:50:29,808 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:29,808 INFO L375 BasicCegarLoop]: trace histogram [10, 1, 1, 1] [2018-09-23 19:50:29,808 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:29,808 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:29,808 INFO L82 PathProgramCache]: Analyzing trace with hash -258347744, now seen corresponding path program 10 times [2018-09-23 19:50:29,809 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:29,809 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:29,810 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:29,810 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:50:29,810 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:29,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:30,133 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:30,134 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:30,134 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 [2018-09-23 19:50:30,143 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 19:50:30,159 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 19:50:30,159 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:50:30,160 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:30,172 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:30,198 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:30,198 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-09-23 19:50:30,198 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-23 19:50:30,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-23 19:50:30,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-09-23 19:50:30,199 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 13 states. [2018-09-23 19:50:30,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:30,258 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-09-23 19:50:30,258 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-23 19:50:30,259 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 13 [2018-09-23 19:50:30,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:30,259 INFO L225 Difference]: With dead ends: 17 [2018-09-23 19:50:30,260 INFO L226 Difference]: Without dead ends: 15 [2018-09-23 19:50:30,261 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 [2018-09-23 19:50:30,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-23 19:50:30,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-23 19:50:30,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-23 19:50:30,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-09-23 19:50:30,265 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2018-09-23 19:50:30,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:30,265 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-09-23 19:50:30,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-23 19:50:30,265 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-09-23 19:50:30,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-23 19:50:30,266 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:30,266 INFO L375 BasicCegarLoop]: trace histogram [11, 1, 1, 1] [2018-09-23 19:50:30,266 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:30,266 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:30,266 INFO L82 PathProgramCache]: Analyzing trace with hash 581150662, now seen corresponding path program 11 times [2018-09-23 19:50:30,266 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:30,266 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:30,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:30,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:50:30,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:30,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:30,531 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:30,531 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:30,532 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 [2018-09-23 19:50:30,543 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 19:50:33,030 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-09-23 19:50:33,030 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:50:33,035 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:33,045 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:33,066 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:33,067 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-09-23 19:50:33,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-23 19:50:33,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-23 19:50:33,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-09-23 19:50:33,068 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 14 states. [2018-09-23 19:50:33,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:33,104 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-09-23 19:50:33,104 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-23 19:50:33,104 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2018-09-23 19:50:33,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:33,105 INFO L225 Difference]: With dead ends: 18 [2018-09-23 19:50:33,106 INFO L226 Difference]: Without dead ends: 16 [2018-09-23 19:50:33,106 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 [2018-09-23 19:50:33,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-09-23 19:50:33,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-09-23 19:50:33,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-09-23 19:50:33,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-09-23 19:50:33,110 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2018-09-23 19:50:33,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:33,111 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-09-23 19:50:33,111 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-23 19:50:33,111 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-09-23 19:50:33,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-09-23 19:50:33,111 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:33,112 INFO L375 BasicCegarLoop]: trace histogram [12, 1, 1, 1] [2018-09-23 19:50:33,112 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:33,112 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:33,112 INFO L82 PathProgramCache]: Analyzing trace with hash 835797472, now seen corresponding path program 12 times [2018-09-23 19:50:33,113 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:33,113 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:33,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:33,114 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:50:33,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:33,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:33,340 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:33,340 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:33,340 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 [2018-09-23 19:50:33,348 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 19:50:33,387 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-23 19:50:33,387 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:50:33,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:33,398 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:33,425 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:33,425 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-09-23 19:50:33,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-23 19:50:33,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-23 19:50:33,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-09-23 19:50:33,426 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 15 states. [2018-09-23 19:50:33,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:33,476 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-23 19:50:33,476 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-23 19:50:33,477 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 15 [2018-09-23 19:50:33,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:33,477 INFO L225 Difference]: With dead ends: 19 [2018-09-23 19:50:33,477 INFO L226 Difference]: Without dead ends: 17 [2018-09-23 19:50:33,478 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 [2018-09-23 19:50:33,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-23 19:50:33,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-23 19:50:33,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-23 19:50:33,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-23 19:50:33,482 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2018-09-23 19:50:33,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:33,482 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-23 19:50:33,482 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-23 19:50:33,483 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-23 19:50:33,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-09-23 19:50:33,483 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:33,483 INFO L375 BasicCegarLoop]: trace histogram [13, 1, 1, 1] [2018-09-23 19:50:33,484 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:33,484 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:33,484 INFO L82 PathProgramCache]: Analyzing trace with hash 139913990, now seen corresponding path program 13 times [2018-09-23 19:50:33,484 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:33,484 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:33,485 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:33,485 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:50:33,485 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:33,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:33,876 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:33,877 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:33,877 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 [2018-09-23 19:50:33,887 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:50:33,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:33,902 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:33,920 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:33,950 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:33,951 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-23 19:50:33,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-23 19:50:33,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-23 19:50:33,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-09-23 19:50:33,952 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 16 states. [2018-09-23 19:50:34,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:34,069 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-09-23 19:50:34,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-23 19:50:34,069 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 16 [2018-09-23 19:50:34,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:34,070 INFO L225 Difference]: With dead ends: 20 [2018-09-23 19:50:34,070 INFO L226 Difference]: Without dead ends: 18 [2018-09-23 19:50:34,071 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 [2018-09-23 19:50:34,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-09-23 19:50:34,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-09-23 19:50:34,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-09-23 19:50:34,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-09-23 19:50:34,078 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2018-09-23 19:50:34,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:34,078 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-09-23 19:50:34,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-23 19:50:34,078 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-09-23 19:50:34,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-23 19:50:34,079 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:34,079 INFO L375 BasicCegarLoop]: trace histogram [14, 1, 1, 1] [2018-09-23 19:50:34,079 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:34,079 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:34,080 INFO L82 PathProgramCache]: Analyzing trace with hash 42362528, now seen corresponding path program 14 times [2018-09-23 19:50:34,080 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:34,080 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:34,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:34,081 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:50:34,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:34,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:34,511 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:34,511 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:34,512 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 [2018-09-23 19:50:34,525 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 19:50:34,544 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 19:50:34,544 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:50:34,546 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:34,556 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:34,577 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:34,578 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-09-23 19:50:34,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-23 19:50:34,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-23 19:50:34,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-09-23 19:50:34,579 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 17 states. [2018-09-23 19:50:34,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:34,626 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-23 19:50:34,626 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-23 19:50:34,627 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 17 [2018-09-23 19:50:34,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:34,628 INFO L225 Difference]: With dead ends: 21 [2018-09-23 19:50:34,628 INFO L226 Difference]: Without dead ends: 19 [2018-09-23 19:50:34,629 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-09-23 19:50:34,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-23 19:50:34,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-23 19:50:34,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-23 19:50:34,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-23 19:50:34,633 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2018-09-23 19:50:34,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:34,634 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-23 19:50:34,634 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-23 19:50:34,634 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-23 19:50:34,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-23 19:50:34,634 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:34,635 INFO L375 BasicCegarLoop]: trace histogram [15, 1, 1, 1] [2018-09-23 19:50:34,635 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:34,635 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:34,635 INFO L82 PathProgramCache]: Analyzing trace with hash 1313234502, now seen corresponding path program 15 times [2018-09-23 19:50:34,635 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:34,636 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:34,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:34,637 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:50:34,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:34,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:34,926 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:34,926 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:34,927 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 [2018-09-23 19:50:34,936 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 19:50:37,266 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-09-23 19:50:37,266 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:50:37,268 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:37,277 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:37,302 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:37,302 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-09-23 19:50:37,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-23 19:50:37,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-23 19:50:37,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-09-23 19:50:37,303 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 18 states. [2018-09-23 19:50:37,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:37,361 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-09-23 19:50:37,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-23 19:50:37,361 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 18 [2018-09-23 19:50:37,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:37,362 INFO L225 Difference]: With dead ends: 22 [2018-09-23 19:50:37,362 INFO L226 Difference]: Without dead ends: 20 [2018-09-23 19:50:37,362 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 [2018-09-23 19:50:37,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-09-23 19:50:37,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-09-23 19:50:37,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-09-23 19:50:37,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-09-23 19:50:37,366 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2018-09-23 19:50:37,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:37,366 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-09-23 19:50:37,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-23 19:50:37,367 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-09-23 19:50:37,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-09-23 19:50:37,367 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:37,367 INFO L375 BasicCegarLoop]: trace histogram [16, 1, 1, 1] [2018-09-23 19:50:37,367 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:37,367 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:37,368 INFO L82 PathProgramCache]: Analyzing trace with hash 2055560032, now seen corresponding path program 16 times [2018-09-23 19:50:37,368 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:37,368 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:37,369 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:37,369 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:50:37,369 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:37,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:37,900 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:37,901 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:37,901 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 [2018-09-23 19:50:37,909 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 19:50:37,935 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 19:50:37,936 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:50:37,938 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:50:37,949 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:37,980 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:50:37,980 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-09-23 19:50:37,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-23 19:50:37,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-23 19:50:37,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-09-23 19:50:37,982 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 19 states. [2018-09-23 19:50:38,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:50:38,101 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-23 19:50:38,102 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-23 19:50:38,102 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 19 [2018-09-23 19:50:38,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:50:38,103 INFO L225 Difference]: With dead ends: 23 [2018-09-23 19:50:38,103 INFO L226 Difference]: Without dead ends: 21 [2018-09-23 19:50:38,104 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-09-23 19:50:38,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-23 19:50:38,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-09-23 19:50:38,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-23 19:50:38,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-09-23 19:50:38,108 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2018-09-23 19:50:38,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:50:38,108 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-09-23 19:50:38,108 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-23 19:50:38,108 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-09-23 19:50:38,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-23 19:50:38,109 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:50:38,109 INFO L375 BasicCegarLoop]: trace histogram [17, 1, 1, 1] [2018-09-23 19:50:38,109 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:50:38,109 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:50:38,109 INFO L82 PathProgramCache]: Analyzing trace with hash -702152314, now seen corresponding path program 17 times [2018-09-23 19:50:38,110 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:50:38,110 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:50:38,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:38,111 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:50:38,111 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:50:38,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:50:38,685 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:50:38,685 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:50:38,686 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 [2018-09-23 19:50:38,694 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 19:51:27,729 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2018-09-23 19:51:27,729 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:51:27,930 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:51:27,950 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:51:27,972 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:51:27,973 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-09-23 19:51:27,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-23 19:51:27,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-23 19:51:27,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-09-23 19:51:27,974 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 20 states. [2018-09-23 19:51:28,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:51:28,080 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-09-23 19:51:28,080 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-23 19:51:28,081 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 20 [2018-09-23 19:51:28,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:51:28,081 INFO L225 Difference]: With dead ends: 24 [2018-09-23 19:51:28,081 INFO L226 Difference]: Without dead ends: 22 [2018-09-23 19:51:28,082 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 [2018-09-23 19:51:28,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-09-23 19:51:28,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-09-23 19:51:28,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-09-23 19:51:28,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-09-23 19:51:28,087 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2018-09-23 19:51:28,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:51:28,087 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-09-23 19:51:28,087 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-23 19:51:28,087 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-09-23 19:51:28,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-09-23 19:51:28,088 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:51:28,088 INFO L375 BasicCegarLoop]: trace histogram [18, 1, 1, 1] [2018-09-23 19:51:28,088 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:51:28,089 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:51:28,089 INFO L82 PathProgramCache]: Analyzing trace with hash -291889120, now seen corresponding path program 18 times [2018-09-23 19:51:28,089 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:51:28,089 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:51:28,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:51:28,090 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:51:28,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:51:28,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:51:28,623 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:51:28,623 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:51:28,623 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 [2018-09-23 19:51:28,634 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 19:51:30,533 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2018-09-23 19:51:30,533 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:51:30,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:51:30,551 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:51:30,580 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:51:30,580 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2018-09-23 19:51:30,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-09-23 19:51:30,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-09-23 19:51:30,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-09-23 19:51:30,582 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 21 states. [2018-09-23 19:51:30,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:51:30,673 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-23 19:51:30,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-09-23 19:51:30,675 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 21 [2018-09-23 19:51:30,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:51:30,675 INFO L225 Difference]: With dead ends: 25 [2018-09-23 19:51:30,676 INFO L226 Difference]: Without dead ends: 23 [2018-09-23 19:51:30,676 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-09-23 19:51:30,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-23 19:51:30,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-23 19:51:30,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-23 19:51:30,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-09-23 19:51:30,684 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2018-09-23 19:51:30,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:51:30,684 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-09-23 19:51:30,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-09-23 19:51:30,684 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-09-23 19:51:30,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-23 19:51:30,685 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:51:30,685 INFO L375 BasicCegarLoop]: trace histogram [19, 1, 1, 1] [2018-09-23 19:51:30,685 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:51:30,686 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:51:30,686 INFO L82 PathProgramCache]: Analyzing trace with hash -458631994, now seen corresponding path program 19 times [2018-09-23 19:51:30,686 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:51:30,686 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:51:30,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:51:30,687 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:51:30,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:51:30,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:51:30,965 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:51:30,965 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:51:30,966 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 [2018-09-23 19:51:30,973 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:51:30,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:51:30,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:51:31,009 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:51:31,039 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:51:31,039 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-09-23 19:51:31,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-23 19:51:31,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-23 19:51:31,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-09-23 19:51:31,040 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 22 states. [2018-09-23 19:51:31,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:51:31,111 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-09-23 19:51:31,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-09-23 19:51:31,111 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 22 [2018-09-23 19:51:31,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:51:31,112 INFO L225 Difference]: With dead ends: 26 [2018-09-23 19:51:31,112 INFO L226 Difference]: Without dead ends: 24 [2018-09-23 19:51:31,114 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 [2018-09-23 19:51:31,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-09-23 19:51:31,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-09-23 19:51:31,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-09-23 19:51:31,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-09-23 19:51:31,117 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2018-09-23 19:51:31,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:51:31,118 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-09-23 19:51:31,118 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-23 19:51:31,118 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-09-23 19:51:31,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-09-23 19:51:31,118 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:51:31,119 INFO L375 BasicCegarLoop]: trace histogram [20, 1, 1, 1] [2018-09-23 19:51:31,119 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:51:31,119 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:51:31,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1332693792, now seen corresponding path program 20 times [2018-09-23 19:51:31,119 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:51:31,119 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:51:31,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:51:31,120 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:51:31,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:51:31,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:51:31,519 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:51:31,520 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:51:31,520 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 [2018-09-23 19:51:31,527 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 19:51:31,547 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 19:51:31,547 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:51:31,549 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:51:31,558 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:51:31,587 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:51:31,588 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-09-23 19:51:31,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-09-23 19:51:31,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-09-23 19:51:31,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-09-23 19:51:31,589 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 23 states. [2018-09-23 19:51:31,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:51:31,780 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-23 19:51:31,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-09-23 19:51:31,781 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 23 [2018-09-23 19:51:31,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:51:31,781 INFO L225 Difference]: With dead ends: 27 [2018-09-23 19:51:31,782 INFO L226 Difference]: Without dead ends: 25 [2018-09-23 19:51:31,783 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 [2018-09-23 19:51:31,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-09-23 19:51:31,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-09-23 19:51:31,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-09-23 19:51:31,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-09-23 19:51:31,785 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2018-09-23 19:51:31,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:51:31,786 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-09-23 19:51:31,786 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-09-23 19:51:31,786 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-09-23 19:51:31,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-09-23 19:51:31,787 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:51:31,787 INFO L375 BasicCegarLoop]: trace histogram [21, 1, 1, 1] [2018-09-23 19:51:31,787 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:51:31,787 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:51:31,787 INFO L82 PathProgramCache]: Analyzing trace with hash 1636161542, now seen corresponding path program 21 times [2018-09-23 19:51:31,788 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:51:31,788 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:51:31,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:51:31,789 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:51:31,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:51:31,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:51:32,159 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:51:32,159 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:51:32,159 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-23 19:51:32,166 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 19:52:07,588 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-09-23 19:52:07,588 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:52:07,624 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:52:07,633 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:52:07,662 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:52:07,662 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-09-23 19:52:07,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-09-23 19:52:07,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-09-23 19:52:07,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-09-23 19:52:07,663 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 24 states. [2018-09-23 19:52:07,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:52:07,714 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-09-23 19:52:07,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-09-23 19:52:07,715 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 24 [2018-09-23 19:52:07,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:52:07,716 INFO L225 Difference]: With dead ends: 28 [2018-09-23 19:52:07,716 INFO L226 Difference]: Without dead ends: 26 [2018-09-23 19:52:07,717 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 [2018-09-23 19:52:07,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-09-23 19:52:07,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-09-23 19:52:07,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-09-23 19:52:07,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-09-23 19:52:07,719 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2018-09-23 19:52:07,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:52:07,720 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-09-23 19:52:07,720 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-09-23 19:52:07,720 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-09-23 19:52:07,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-09-23 19:52:07,721 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:52:07,721 INFO L375 BasicCegarLoop]: trace histogram [22, 1, 1, 1] [2018-09-23 19:52:07,721 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:52:07,721 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:52:07,721 INFO L82 PathProgramCache]: Analyzing trace with hash -818603616, now seen corresponding path program 22 times [2018-09-23 19:52:07,721 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:52:07,721 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:52:07,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:52:07,722 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:52:07,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:52:07,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:52:08,042 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:52:08,042 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:52:08,042 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-23 19:52:08,051 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 19:52:08,067 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 19:52:08,067 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:52:08,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:52:08,078 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:52:08,104 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:52:08,104 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 24 [2018-09-23 19:52:08,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-09-23 19:52:08,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-09-23 19:52:08,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-09-23 19:52:08,105 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 25 states. [2018-09-23 19:52:08,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:52:08,162 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-23 19:52:08,163 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-09-23 19:52:08,163 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 25 [2018-09-23 19:52:08,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:52:08,164 INFO L225 Difference]: With dead ends: 29 [2018-09-23 19:52:08,164 INFO L226 Difference]: Without dead ends: 27 [2018-09-23 19:52:08,165 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 [2018-09-23 19:52:08,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-23 19:52:08,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-23 19:52:08,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-23 19:52:08,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-09-23 19:52:08,168 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2018-09-23 19:52:08,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:52:08,168 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-09-23 19:52:08,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-09-23 19:52:08,168 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-09-23 19:52:08,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-23 19:52:08,169 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:52:08,169 INFO L375 BasicCegarLoop]: trace histogram [23, 1, 1, 1] [2018-09-23 19:52:08,169 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:52:08,169 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:52:08,170 INFO L82 PathProgramCache]: Analyzing trace with hash 393087814, now seen corresponding path program 23 times [2018-09-23 19:52:08,170 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:52:08,170 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:52:08,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:52:08,170 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:52:08,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:52:08,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:52:08,554 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:52:08,554 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:52:08,554 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 [2018-09-23 19:52:08,564 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 19:53:22,609 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2018-09-23 19:53:22,609 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:53:22,683 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:53:22,694 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:53:22,725 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:53:22,725 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-09-23 19:53:22,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-09-23 19:53:22,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-09-23 19:53:22,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-09-23 19:53:22,727 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 26 states. [2018-09-23 19:53:22,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:53:22,800 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-09-23 19:53:22,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-09-23 19:53:22,801 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 26 [2018-09-23 19:53:22,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:53:22,801 INFO L225 Difference]: With dead ends: 30 [2018-09-23 19:53:22,801 INFO L226 Difference]: Without dead ends: 28 [2018-09-23 19:53:22,802 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-09-23 19:53:22,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-09-23 19:53:22,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-09-23 19:53:22,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-09-23 19:53:22,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-09-23 19:53:22,805 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2018-09-23 19:53:22,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:53:22,806 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-09-23 19:53:22,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-09-23 19:53:22,806 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-09-23 19:53:22,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-09-23 19:53:22,807 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:53:22,807 INFO L375 BasicCegarLoop]: trace histogram [24, 1, 1, 1] [2018-09-23 19:53:22,807 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:53:22,807 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:53:22,807 INFO L82 PathProgramCache]: Analyzing trace with hash -699183520, now seen corresponding path program 24 times [2018-09-23 19:53:22,808 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:53:22,808 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:53:22,808 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:53:22,809 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:53:22,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:53:22,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:53:23,604 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:53:23,604 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:53:23,605 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 [2018-09-23 19:53:23,614 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 19:53:31,339 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-23 19:53:31,339 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:53:31,358 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:53:31,367 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:53:31,397 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:53:31,397 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 26 [2018-09-23 19:53:31,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-09-23 19:53:31,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-09-23 19:53:31,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-09-23 19:53:31,398 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 27 states. [2018-09-23 19:53:31,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:53:31,473 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-23 19:53:31,473 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-09-23 19:53:31,473 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 27 [2018-09-23 19:53:31,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:53:31,474 INFO L225 Difference]: With dead ends: 31 [2018-09-23 19:53:31,474 INFO L226 Difference]: Without dead ends: 29 [2018-09-23 19:53:31,475 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 [2018-09-23 19:53:31,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-23 19:53:31,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-09-23 19:53:31,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-23 19:53:31,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-09-23 19:53:31,477 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2018-09-23 19:53:31,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:53:31,478 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-09-23 19:53:31,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-09-23 19:53:31,478 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-09-23 19:53:31,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-09-23 19:53:31,479 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:53:31,479 INFO L375 BasicCegarLoop]: trace histogram [25, 1, 1, 1] [2018-09-23 19:53:31,479 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:53:31,479 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:53:31,479 INFO L82 PathProgramCache]: Analyzing trace with hash -199856506, now seen corresponding path program 25 times [2018-09-23 19:53:31,479 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:53:31,479 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:53:31,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:53:31,480 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:53:31,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:53:31,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:53:32,099 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:53:32,100 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:53:32,100 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 [2018-09-23 19:53:32,109 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:53:32,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:53:32,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:53:32,141 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:53:32,170 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:53:32,170 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 27 [2018-09-23 19:53:32,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-09-23 19:53:32,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-09-23 19:53:32,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-09-23 19:53:32,171 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 28 states. [2018-09-23 19:53:32,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:53:32,225 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-09-23 19:53:32,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-09-23 19:53:32,225 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 28 [2018-09-23 19:53:32,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:53:32,226 INFO L225 Difference]: With dead ends: 32 [2018-09-23 19:53:32,226 INFO L226 Difference]: Without dead ends: 30 [2018-09-23 19:53:32,227 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 [2018-09-23 19:53:32,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-09-23 19:53:32,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-09-23 19:53:32,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-09-23 19:53:32,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-09-23 19:53:32,230 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2018-09-23 19:53:32,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:53:32,230 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-09-23 19:53:32,230 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-09-23 19:53:32,230 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-09-23 19:53:32,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-09-23 19:53:32,231 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:53:32,231 INFO L375 BasicCegarLoop]: trace histogram [26, 1, 1, 1] [2018-09-23 19:53:32,231 INFO L423 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:53:32,231 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:53:32,232 INFO L82 PathProgramCache]: Analyzing trace with hash -1900588256, now seen corresponding path program 26 times [2018-09-23 19:53:32,232 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:53:32,232 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:53:32,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:53:32,233 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:53:32,233 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:53:32,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:53:33,209 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:53:33,209 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:53:33,209 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 [2018-09-23 19:53:33,217 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 19:53:33,236 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 19:53:33,236 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:53:33,238 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:53:33,254 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:53:33,284 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:53:33,284 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 28 [2018-09-23 19:53:33,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-09-23 19:53:33,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-09-23 19:53:33,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-09-23 19:53:33,286 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 29 states. [2018-09-23 19:53:33,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:53:33,452 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-23 19:53:33,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-09-23 19:53:33,453 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 29 [2018-09-23 19:53:33,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:53:33,453 INFO L225 Difference]: With dead ends: 33 [2018-09-23 19:53:33,454 INFO L226 Difference]: Without dead ends: 31 [2018-09-23 19:53:33,454 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-09-23 19:53:33,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-23 19:53:33,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-23 19:53:33,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-23 19:53:33,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-09-23 19:53:33,458 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2018-09-23 19:53:33,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:53:33,458 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-09-23 19:53:33,458 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-09-23 19:53:33,459 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-09-23 19:53:33,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-23 19:53:33,459 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:53:33,459 INFO L375 BasicCegarLoop]: trace histogram [27, 1, 1, 1] [2018-09-23 19:53:33,459 INFO L423 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:53:33,460 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:53:33,460 INFO L82 PathProgramCache]: Analyzing trace with hash 1211302342, now seen corresponding path program 27 times [2018-09-23 19:53:33,460 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:53:33,460 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:53:33,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:53:33,461 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:53:33,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:53:33,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:53:33,820 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:53:33,820 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:53:33,820 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 [2018-09-23 19:53:33,829 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 19:54:22,041 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-09-23 19:54:22,041 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:54:22,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:54:22,140 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:54:22,167 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:54:22,167 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 29 [2018-09-23 19:54:22,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-09-23 19:54:22,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-09-23 19:54:22,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-09-23 19:54:22,168 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 30 states. [2018-09-23 19:54:22,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:54:22,208 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-09-23 19:54:22,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-09-23 19:54:22,208 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 30 [2018-09-23 19:54:22,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:54:22,209 INFO L225 Difference]: With dead ends: 34 [2018-09-23 19:54:22,209 INFO L226 Difference]: Without dead ends: 32 [2018-09-23 19:54:22,210 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-09-23 19:54:22,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-09-23 19:54:22,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-09-23 19:54:22,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-09-23 19:54:22,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-09-23 19:54:22,214 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2018-09-23 19:54:22,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:54:22,214 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-09-23 19:54:22,214 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-09-23 19:54:22,214 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-09-23 19:54:22,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-09-23 19:54:22,215 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:54:22,215 INFO L375 BasicCegarLoop]: trace histogram [28, 1, 1, 1] [2018-09-23 19:54:22,215 INFO L423 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:54:22,215 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:54:22,215 INFO L82 PathProgramCache]: Analyzing trace with hash -1104336928, now seen corresponding path program 28 times [2018-09-23 19:54:22,215 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:54:22,216 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:54:22,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:54:22,216 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:54:22,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:54:22,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:54:22,794 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:54:22,794 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:54:22,794 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 [2018-09-23 19:54:22,803 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 19:54:22,824 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 19:54:22,824 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:54:22,826 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:54:22,835 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:54:22,864 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:54:22,864 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 30 [2018-09-23 19:54:22,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-09-23 19:54:22,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-09-23 19:54:22,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-09-23 19:54:22,865 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 31 states. [2018-09-23 19:54:22,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:54:22,941 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-23 19:54:22,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-09-23 19:54:22,941 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 31 [2018-09-23 19:54:22,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:54:22,942 INFO L225 Difference]: With dead ends: 35 [2018-09-23 19:54:22,942 INFO L226 Difference]: Without dead ends: 33 [2018-09-23 19:54:22,943 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-09-23 19:54:22,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-23 19:54:22,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-09-23 19:54:22,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-23 19:54:22,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-23 19:54:22,946 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2018-09-23 19:54:22,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:54:22,947 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-23 19:54:22,947 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-09-23 19:54:22,947 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-23 19:54:22,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-23 19:54:22,948 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:54:22,948 INFO L375 BasicCegarLoop]: trace histogram [29, 1, 1, 1] [2018-09-23 19:54:22,948 INFO L423 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:54:22,948 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:54:22,948 INFO L82 PathProgramCache]: Analyzing trace with hash 125289734, now seen corresponding path program 29 times [2018-09-23 19:54:22,948 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:54:22,949 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:54:22,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:54:22,949 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:54:22,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:54:22,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:54:23,783 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:54:23,784 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:54:23,784 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 [2018-09-23 19:54:23,794 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown