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/20170304-DifficultPathPrograms/array4.i_4.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-bd42740 [2018-09-23 21:23:29,794 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-23 21:23:29,796 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-23 21:23:29,808 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-23 21:23:29,809 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-23 21:23:29,810 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-23 21:23:29,811 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-23 21:23:29,813 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-23 21:23:29,814 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-23 21:23:29,815 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-23 21:23:29,816 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-23 21:23:29,816 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-23 21:23:29,817 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-23 21:23:29,818 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-23 21:23:29,820 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-23 21:23:29,821 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-23 21:23:29,821 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-23 21:23:29,823 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-23 21:23:29,825 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-23 21:23:29,827 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-23 21:23:29,828 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-23 21:23:29,830 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-23 21:23:29,832 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-09-23 21:23:29,842 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 21:23:29,857 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-23 21:23:29,857 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-23 21:23:29,858 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-23 21:23:29,858 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-23 21:23:29,859 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-23 21:23:29,859 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-23 21:23:29,859 INFO L133 SettingsManager]: * Use SBE=true [2018-09-23 21:23:29,859 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-23 21:23:29,860 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-23 21:23:29,860 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-23 21:23:29,860 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-23 21:23:29,860 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-23 21:23:29,860 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-23 21:23:29,861 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-23 21:23:29,861 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-23 21:23:29,861 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-23 21:23:29,861 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-23 21:23:29,861 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-23 21:23:29,862 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-23 21:23:29,862 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-23 21:23:29,862 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-23 21:23:29,862 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-23 21:23:29,862 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-23 21:23:29,863 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-23 21:23:29,863 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-23 21:23:29,863 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-23 21:23:29,863 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-23 21:23:29,864 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-23 21:23:29,864 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-23 21:23:29,864 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-23 21:23:29,909 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-23 21:23:29,922 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-23 21:23:29,926 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-23 21:23:29,927 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-23 21:23:29,928 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-23 21:23:29,929 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/array4.i_4.bpl [2018-09-23 21:23:29,929 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/array4.i_4.bpl' [2018-09-23 21:23:29,996 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-23 21:23:30,000 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-23 21:23:30,001 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-23 21:23:30,001 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-23 21:23:30,001 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-23 21:23:30,022 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:23:29" (1/1) ... [2018-09-23 21:23:30,038 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:23:29" (1/1) ... [2018-09-23 21:23:30,045 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-23 21:23:30,046 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-23 21:23:30,046 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-23 21:23:30,047 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-23 21:23:30,059 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:23:29" (1/1) ... [2018-09-23 21:23:30,060 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:23:29" (1/1) ... [2018-09-23 21:23:30,061 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:23:29" (1/1) ... [2018-09-23 21:23:30,061 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:23:29" (1/1) ... [2018-09-23 21:23:30,064 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:23:29" (1/1) ... [2018-09-23 21:23:30,066 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:23:29" (1/1) ... [2018-09-23 21:23:30,067 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:23:29" (1/1) ... [2018-09-23 21:23:30,069 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-23 21:23:30,070 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-23 21:23:30,070 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-23 21:23:30,070 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-23 21:23:30,071 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:23:29" (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 21:23:30,152 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-23 21:23:30,152 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-23 21:23:30,363 INFO L354 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-23 21:23:30,364 INFO L202 PluginConnector]: Adding new model array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.09 09:23:30 BoogieIcfgContainer [2018-09-23 21:23:30,364 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-23 21:23:30,366 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-23 21:23:30,366 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-23 21:23:30,374 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-23 21:23:30,374 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:23:29" (1/2) ... [2018-09-23 21:23:30,376 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61ed0c1a and model type array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.09 09:23:30, skipping insertion in model container [2018-09-23 21:23:30,376 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.09 09:23:30" (2/2) ... [2018-09-23 21:23:30,378 INFO L112 eAbstractionObserver]: Analyzing ICFG array4.i_4.bpl [2018-09-23 21:23:30,390 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-23 21:23:30,399 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-23 21:23:30,462 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-23 21:23:30,463 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-23 21:23:30,463 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-23 21:23:30,463 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-23 21:23:30,463 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-23 21:23:30,463 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-23 21:23:30,464 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-23 21:23:30,464 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-23 21:23:30,464 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-23 21:23:30,488 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states. [2018-09-23 21:23:30,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-23 21:23:30,506 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:30,510 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-09-23 21:23:30,513 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:30,524 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:30,524 INFO L82 PathProgramCache]: Analyzing trace with hash 889539531, now seen corresponding path program 1 times [2018-09-23 21:23:30,528 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:30,528 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:30,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:30,589 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:23:30,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:30,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:30,689 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 21:23:30,691 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-23 21:23:30,691 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-23 21:23:30,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-23 21:23:30,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-23 21:23:30,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-23 21:23:30,711 INFO L87 Difference]: Start difference. First operand 9 states. Second operand 3 states. [2018-09-23 21:23:30,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:30,765 INFO L93 Difference]: Finished difference Result 17 states and 21 transitions. [2018-09-23 21:23:30,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-23 21:23:30,767 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2018-09-23 21:23:30,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:30,778 INFO L225 Difference]: With dead ends: 17 [2018-09-23 21:23:30,778 INFO L226 Difference]: Without dead ends: 11 [2018-09-23 21:23:30,783 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 21:23:30,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-23 21:23:30,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-23 21:23:30,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-23 21:23:30,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2018-09-23 21:23:30,822 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 6 [2018-09-23 21:23:30,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:30,822 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2018-09-23 21:23:30,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-23 21:23:30,823 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2018-09-23 21:23:30,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-23 21:23:30,823 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:30,823 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2018-09-23 21:23:30,824 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:30,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:30,824 INFO L82 PathProgramCache]: Analyzing trace with hash 1897191999, now seen corresponding path program 1 times [2018-09-23 21:23:30,824 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:30,825 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:30,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:30,826 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:23:30,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:30,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:30,887 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-09-23 21:23:30,887 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:30,887 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 21:23:30,896 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:23:30,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:30,940 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:30,960 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-09-23 21:23:31,015 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:31,015 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-09-23 21:23:31,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-23 21:23:31,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-23 21:23:31,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-09-23 21:23:31,017 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 4 states. [2018-09-23 21:23:31,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:31,104 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2018-09-23 21:23:31,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-23 21:23:31,110 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 10 [2018-09-23 21:23:31,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:31,110 INFO L225 Difference]: With dead ends: 21 [2018-09-23 21:23:31,111 INFO L226 Difference]: Without dead ends: 15 [2018-09-23 21:23:31,112 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-09-23 21:23:31,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-23 21:23:31,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-23 21:23:31,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-23 21:23:31,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-09-23 21:23:31,116 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2018-09-23 21:23:31,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:31,117 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-09-23 21:23:31,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-23 21:23:31,117 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-09-23 21:23:31,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-23 21:23:31,118 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:31,118 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1] [2018-09-23 21:23:31,118 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:31,119 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:31,119 INFO L82 PathProgramCache]: Analyzing trace with hash 87273139, now seen corresponding path program 2 times [2018-09-23 21:23:31,119 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:31,119 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:31,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:31,120 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:23:31,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:31,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:31,250 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-09-23 21:23:31,250 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:31,250 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 21:23:31,268 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:23:31,305 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:23:31,305 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:31,307 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:31,314 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-09-23 21:23:31,343 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:31,344 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-09-23 21:23:31,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-23 21:23:31,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-23 21:23:31,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-09-23 21:23:31,345 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2018-09-23 21:23:31,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:31,451 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2018-09-23 21:23:31,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-23 21:23:31,452 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2018-09-23 21:23:31,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:31,453 INFO L225 Difference]: With dead ends: 27 [2018-09-23 21:23:31,453 INFO L226 Difference]: Without dead ends: 19 [2018-09-23 21:23:31,454 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 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 21:23:31,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-23 21:23:31,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-23 21:23:31,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-23 21:23:31,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-09-23 21:23:31,459 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-09-23 21:23:31,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:31,460 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-09-23 21:23:31,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-23 21:23:31,460 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-09-23 21:23:31,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-23 21:23:31,461 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:31,461 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1] [2018-09-23 21:23:31,462 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:31,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:31,462 INFO L82 PathProgramCache]: Analyzing trace with hash -1310275289, now seen corresponding path program 3 times [2018-09-23 21:23:31,462 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:31,463 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:31,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:31,464 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:31,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:31,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:31,628 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-09-23 21:23:31,628 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:31,629 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 21:23:31,639 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:23:31,723 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-23 21:23:31,723 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:31,725 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:31,735 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-09-23 21:23:31,768 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:31,769 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-09-23 21:23:31,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-23 21:23:31,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-23 21:23:31,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-09-23 21:23:31,772 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 6 states. [2018-09-23 21:23:31,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:31,890 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2018-09-23 21:23:31,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-23 21:23:31,890 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2018-09-23 21:23:31,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:31,892 INFO L225 Difference]: With dead ends: 33 [2018-09-23 21:23:31,892 INFO L226 Difference]: Without dead ends: 23 [2018-09-23 21:23:31,893 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-09-23 21:23:31,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-23 21:23:31,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-23 21:23:31,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-23 21:23:31,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-09-23 21:23:31,899 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2018-09-23 21:23:31,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:31,899 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-09-23 21:23:31,899 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-23 21:23:31,900 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-09-23 21:23:31,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-23 21:23:31,901 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:31,901 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1] [2018-09-23 21:23:31,901 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:31,902 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:31,902 INFO L82 PathProgramCache]: Analyzing trace with hash 1731406235, now seen corresponding path program 4 times [2018-09-23 21:23:31,902 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:31,902 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:31,903 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:31,903 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:31,903 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:31,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:32,056 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2018-09-23 21:23:32,056 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:32,056 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 21:23:32,070 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:23:32,093 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:23:32,093 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:32,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:32,104 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2018-09-23 21:23:32,129 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:32,129 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-23 21:23:32,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-23 21:23:32,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-23 21:23:32,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-09-23 21:23:32,133 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 7 states. [2018-09-23 21:23:32,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:32,190 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2018-09-23 21:23:32,190 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-23 21:23:32,190 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2018-09-23 21:23:32,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:32,191 INFO L225 Difference]: With dead ends: 39 [2018-09-23 21:23:32,191 INFO L226 Difference]: Without dead ends: 27 [2018-09-23 21:23:32,192 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-09-23 21:23:32,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-23 21:23:32,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-23 21:23:32,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-23 21:23:32,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-09-23 21:23:32,198 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 22 [2018-09-23 21:23:32,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:32,198 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-09-23 21:23:32,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-23 21:23:32,199 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-09-23 21:23:32,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-23 21:23:32,200 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:32,200 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1] [2018-09-23 21:23:32,200 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:32,200 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:32,201 INFO L82 PathProgramCache]: Analyzing trace with hash 77451279, now seen corresponding path program 5 times [2018-09-23 21:23:32,201 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:32,201 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:32,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:32,202 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:32,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:32,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:32,358 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-09-23 21:23:32,359 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:32,359 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 21:23:32,368 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:23:32,403 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-23 21:23:32,403 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:32,406 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:32,421 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-09-23 21:23:32,442 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:32,443 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-09-23 21:23:32,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-23 21:23:32,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-23 21:23:32,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-09-23 21:23:32,444 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2018-09-23 21:23:32,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:32,518 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2018-09-23 21:23:32,519 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-23 21:23:32,519 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-09-23 21:23:32,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:32,520 INFO L225 Difference]: With dead ends: 45 [2018-09-23 21:23:32,521 INFO L226 Difference]: Without dead ends: 31 [2018-09-23 21:23:32,521 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 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 21:23:32,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-23 21:23:32,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-23 21:23:32,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-23 21:23:32,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-09-23 21:23:32,527 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 26 [2018-09-23 21:23:32,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:32,528 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-09-23 21:23:32,528 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-23 21:23:32,528 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-09-23 21:23:32,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-23 21:23:32,529 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:32,529 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1] [2018-09-23 21:23:32,530 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:32,530 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:32,530 INFO L82 PathProgramCache]: Analyzing trace with hash 422296707, now seen corresponding path program 6 times [2018-09-23 21:23:32,530 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:32,531 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:32,532 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:32,532 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:32,532 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:32,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:32,785 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-09-23 21:23:32,786 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:32,786 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 21:23:32,810 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:23:32,875 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-23 21:23:32,875 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:32,879 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:32,890 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-09-23 21:23:32,916 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:32,916 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 9 [2018-09-23 21:23:32,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-23 21:23:32,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-23 21:23:32,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-09-23 21:23:32,918 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 9 states. [2018-09-23 21:23:33,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:33,121 INFO L93 Difference]: Finished difference Result 51 states and 54 transitions. [2018-09-23 21:23:33,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-23 21:23:33,122 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 30 [2018-09-23 21:23:33,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:33,123 INFO L225 Difference]: With dead ends: 51 [2018-09-23 21:23:33,123 INFO L226 Difference]: Without dead ends: 35 [2018-09-23 21:23:33,124 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-09-23 21:23:33,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-09-23 21:23:33,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-09-23 21:23:33,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-23 21:23:33,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2018-09-23 21:23:33,134 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 30 [2018-09-23 21:23:33,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:33,138 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2018-09-23 21:23:33,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-23 21:23:33,138 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2018-09-23 21:23:33,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-23 21:23:33,139 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:33,139 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1] [2018-09-23 21:23:33,140 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:33,140 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:33,140 INFO L82 PathProgramCache]: Analyzing trace with hash -1553862921, now seen corresponding path program 7 times [2018-09-23 21:23:33,140 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:33,141 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:33,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:33,142 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:33,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:33,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:33,630 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2018-09-23 21:23:33,630 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:33,630 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) [2018-09-23 21:23:33,645 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:23:33,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:33,682 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:33,694 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2018-09-23 21:23:33,720 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:33,721 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-23 21:23:33,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-23 21:23:33,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-23 21:23:33,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-09-23 21:23:33,722 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 10 states. [2018-09-23 21:23:33,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:33,782 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2018-09-23 21:23:33,783 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-23 21:23:33,783 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 34 [2018-09-23 21:23:33,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:33,784 INFO L225 Difference]: With dead ends: 57 [2018-09-23 21:23:33,784 INFO L226 Difference]: Without dead ends: 39 [2018-09-23 21:23:33,784 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-09-23 21:23:33,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-23 21:23:33,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-09-23 21:23:33,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-23 21:23:33,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-09-23 21:23:33,791 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2018-09-23 21:23:33,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:33,791 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-09-23 21:23:33,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-23 21:23:33,792 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-09-23 21:23:33,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-23 21:23:33,793 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:33,793 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1] [2018-09-23 21:23:33,794 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:33,795 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:33,795 INFO L82 PathProgramCache]: Analyzing trace with hash -783980693, now seen corresponding path program 8 times [2018-09-23 21:23:33,795 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:33,795 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:33,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:33,796 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:23:33,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:33,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:33,979 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2018-09-23 21:23:33,980 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:33,980 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 21:23:33,993 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:23:34,025 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:23:34,025 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:34,027 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:34,038 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2018-09-23 21:23:34,060 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:34,060 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-09-23 21:23:34,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-23 21:23:34,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-23 21:23:34,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-09-23 21:23:34,062 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 11 states. [2018-09-23 21:23:34,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:34,446 INFO L93 Difference]: Finished difference Result 63 states and 66 transitions. [2018-09-23 21:23:34,446 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-23 21:23:34,446 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 38 [2018-09-23 21:23:34,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:34,447 INFO L225 Difference]: With dead ends: 63 [2018-09-23 21:23:34,447 INFO L226 Difference]: Without dead ends: 43 [2018-09-23 21:23:34,449 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 38 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 21:23:34,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-09-23 21:23:34,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-09-23 21:23:34,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-09-23 21:23:34,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-09-23 21:23:34,455 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 38 [2018-09-23 21:23:34,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:34,456 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-09-23 21:23:34,456 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-23 21:23:34,456 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-09-23 21:23:34,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-09-23 21:23:34,457 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:34,458 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1] [2018-09-23 21:23:34,458 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:34,458 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:34,458 INFO L82 PathProgramCache]: Analyzing trace with hash -1067768353, now seen corresponding path program 9 times [2018-09-23 21:23:34,459 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:34,459 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:34,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:34,460 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:34,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:34,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:34,691 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2018-09-23 21:23:34,691 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:34,692 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 21:23:34,707 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:23:34,848 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-23 21:23:34,848 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:34,851 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:34,862 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2018-09-23 21:23:34,897 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:34,898 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-09-23 21:23:34,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-23 21:23:34,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-23 21:23:34,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-09-23 21:23:34,899 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 12 states. [2018-09-23 21:23:35,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:35,094 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2018-09-23 21:23:35,097 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-23 21:23:35,097 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 42 [2018-09-23 21:23:35,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:35,098 INFO L225 Difference]: With dead ends: 69 [2018-09-23 21:23:35,098 INFO L226 Difference]: Without dead ends: 47 [2018-09-23 21:23:35,099 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 42 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 21:23:35,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-09-23 21:23:35,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-09-23 21:23:35,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-09-23 21:23:35,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2018-09-23 21:23:35,105 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 42 [2018-09-23 21:23:35,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:35,106 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2018-09-23 21:23:35,106 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-23 21:23:35,106 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2018-09-23 21:23:35,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-09-23 21:23:35,107 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:35,108 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1] [2018-09-23 21:23:35,108 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:35,108 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:35,108 INFO L82 PathProgramCache]: Analyzing trace with hash 1034431059, now seen corresponding path program 10 times [2018-09-23 21:23:35,108 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:35,109 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:35,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:35,110 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:35,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:35,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:35,305 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-09-23 21:23:35,305 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:35,305 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 21:23:35,313 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:23:35,340 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:23:35,341 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:35,344 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:35,356 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-09-23 21:23:35,377 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:35,377 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-09-23 21:23:35,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-23 21:23:35,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-23 21:23:35,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-09-23 21:23:35,378 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 13 states. [2018-09-23 21:23:35,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:35,451 INFO L93 Difference]: Finished difference Result 75 states and 78 transitions. [2018-09-23 21:23:35,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-23 21:23:35,452 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 46 [2018-09-23 21:23:35,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:35,453 INFO L225 Difference]: With dead ends: 75 [2018-09-23 21:23:35,453 INFO L226 Difference]: Without dead ends: 51 [2018-09-23 21:23:35,454 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-09-23 21:23:35,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-09-23 21:23:35,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-09-23 21:23:35,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-09-23 21:23:35,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-09-23 21:23:35,461 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 46 [2018-09-23 21:23:35,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:35,462 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-09-23 21:23:35,462 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-23 21:23:35,462 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-09-23 21:23:35,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-09-23 21:23:35,463 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:35,463 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1] [2018-09-23 21:23:35,464 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:35,464 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:35,464 INFO L82 PathProgramCache]: Analyzing trace with hash -2051967801, now seen corresponding path program 11 times [2018-09-23 21:23:35,464 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:35,464 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:35,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:35,465 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:35,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:35,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:35,663 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-09-23 21:23:35,663 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:35,663 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 21:23:35,675 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:23:35,715 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-23 21:23:35,715 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:35,719 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:35,732 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-09-23 21:23:35,752 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:35,753 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-09-23 21:23:35,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-23 21:23:35,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-23 21:23:35,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-09-23 21:23:35,754 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 14 states. [2018-09-23 21:23:35,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:35,839 INFO L93 Difference]: Finished difference Result 81 states and 84 transitions. [2018-09-23 21:23:35,840 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-23 21:23:35,840 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 50 [2018-09-23 21:23:35,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:35,842 INFO L225 Difference]: With dead ends: 81 [2018-09-23 21:23:35,842 INFO L226 Difference]: Without dead ends: 55 [2018-09-23 21:23:35,843 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-09-23 21:23:35,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-09-23 21:23:35,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-09-23 21:23:35,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-09-23 21:23:35,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2018-09-23 21:23:35,850 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 50 [2018-09-23 21:23:35,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:35,850 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2018-09-23 21:23:35,850 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-23 21:23:35,850 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2018-09-23 21:23:35,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-09-23 21:23:35,851 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:35,851 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1] [2018-09-23 21:23:35,852 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:35,852 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:35,852 INFO L82 PathProgramCache]: Analyzing trace with hash 75236667, now seen corresponding path program 12 times [2018-09-23 21:23:35,852 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:35,852 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:35,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:35,853 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:35,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:35,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:36,165 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2018-09-23 21:23:36,165 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:36,166 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 21:23:36,175 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:23:36,268 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-23 21:23:36,268 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:36,272 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:36,287 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2018-09-23 21:23:36,319 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:36,319 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 15 [2018-09-23 21:23:36,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-23 21:23:36,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-23 21:23:36,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-09-23 21:23:36,321 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 15 states. [2018-09-23 21:23:36,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:36,416 INFO L93 Difference]: Finished difference Result 87 states and 90 transitions. [2018-09-23 21:23:36,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-23 21:23:36,416 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 54 [2018-09-23 21:23:36,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:36,417 INFO L225 Difference]: With dead ends: 87 [2018-09-23 21:23:36,418 INFO L226 Difference]: Without dead ends: 59 [2018-09-23 21:23:36,419 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-09-23 21:23:36,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-09-23 21:23:36,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-09-23 21:23:36,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-09-23 21:23:36,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2018-09-23 21:23:36,426 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2018-09-23 21:23:36,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:36,426 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2018-09-23 21:23:36,426 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-23 21:23:36,426 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2018-09-23 21:23:36,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-09-23 21:23:36,427 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:36,428 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1] [2018-09-23 21:23:36,428 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:36,428 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:36,428 INFO L82 PathProgramCache]: Analyzing trace with hash 361552815, now seen corresponding path program 13 times [2018-09-23 21:23:36,428 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:36,428 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:36,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:36,429 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:36,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:36,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:36,668 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2018-09-23 21:23:36,668 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:36,668 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 21:23:36,679 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:23:36,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:36,709 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:36,722 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2018-09-23 21:23:36,753 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:36,753 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-23 21:23:36,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-23 21:23:36,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-23 21:23:36,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-09-23 21:23:36,754 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand 16 states. [2018-09-23 21:23:36,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:36,874 INFO L93 Difference]: Finished difference Result 93 states and 96 transitions. [2018-09-23 21:23:36,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-23 21:23:36,875 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 58 [2018-09-23 21:23:36,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:36,876 INFO L225 Difference]: With dead ends: 93 [2018-09-23 21:23:36,876 INFO L226 Difference]: Without dead ends: 63 [2018-09-23 21:23:36,877 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-09-23 21:23:36,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-09-23 21:23:36,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-09-23 21:23:36,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-09-23 21:23:36,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-09-23 21:23:36,884 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 58 [2018-09-23 21:23:36,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:36,885 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-09-23 21:23:36,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-23 21:23:36,885 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-09-23 21:23:36,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-09-23 21:23:36,888 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:36,888 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1] [2018-09-23 21:23:36,888 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:36,889 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:36,889 INFO L82 PathProgramCache]: Analyzing trace with hash -1008142301, now seen corresponding path program 14 times [2018-09-23 21:23:36,889 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:36,889 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:36,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:36,890 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:23:36,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:36,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:37,276 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-09-23 21:23:37,277 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:37,277 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 21:23:37,290 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:23:37,335 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:23:37,336 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:37,339 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:37,353 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-09-23 21:23:37,383 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:37,383 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-09-23 21:23:37,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-23 21:23:37,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-23 21:23:37,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-09-23 21:23:37,385 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 17 states. [2018-09-23 21:23:37,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:37,490 INFO L93 Difference]: Finished difference Result 99 states and 102 transitions. [2018-09-23 21:23:37,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-23 21:23:37,491 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 62 [2018-09-23 21:23:37,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:37,492 INFO L225 Difference]: With dead ends: 99 [2018-09-23 21:23:37,492 INFO L226 Difference]: Without dead ends: 67 [2018-09-23 21:23:37,494 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 62 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 21:23:37,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-09-23 21:23:37,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-09-23 21:23:37,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-09-23 21:23:37,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-09-23 21:23:37,499 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 62 [2018-09-23 21:23:37,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:37,500 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-09-23 21:23:37,500 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-23 21:23:37,500 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-09-23 21:23:37,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-09-23 21:23:37,501 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:37,501 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1] [2018-09-23 21:23:37,501 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:37,502 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:37,502 INFO L82 PathProgramCache]: Analyzing trace with hash -1978312041, now seen corresponding path program 15 times [2018-09-23 21:23:37,502 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:37,502 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:37,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:37,503 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:37,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:37,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:38,168 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2018-09-23 21:23:38,169 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:38,169 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 21:23:38,176 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:23:38,298 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-23 21:23:38,298 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:38,301 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:38,329 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2018-09-23 21:23:38,360 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:38,360 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-09-23 21:23:38,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-23 21:23:38,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-23 21:23:38,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-09-23 21:23:38,361 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 18 states. [2018-09-23 21:23:38,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:38,665 INFO L93 Difference]: Finished difference Result 105 states and 108 transitions. [2018-09-23 21:23:38,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-23 21:23:38,665 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 66 [2018-09-23 21:23:38,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:38,667 INFO L225 Difference]: With dead ends: 105 [2018-09-23 21:23:38,667 INFO L226 Difference]: Without dead ends: 71 [2018-09-23 21:23:38,668 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-09-23 21:23:38,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-09-23 21:23:38,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2018-09-23 21:23:38,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-09-23 21:23:38,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2018-09-23 21:23:38,675 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 66 [2018-09-23 21:23:38,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:38,675 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2018-09-23 21:23:38,675 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-23 21:23:38,676 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2018-09-23 21:23:38,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-09-23 21:23:38,676 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:38,677 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1] [2018-09-23 21:23:38,677 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:38,677 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:38,677 INFO L82 PathProgramCache]: Analyzing trace with hash 303497995, now seen corresponding path program 16 times [2018-09-23 21:23:38,678 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:38,678 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:38,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:38,679 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:38,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:38,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:38,924 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2018-09-23 21:23:38,924 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:38,925 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 21:23:38,935 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:23:38,963 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:23:38,964 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:38,967 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:38,982 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2018-09-23 21:23:39,012 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:39,012 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-09-23 21:23:39,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-23 21:23:39,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-23 21:23:39,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-09-23 21:23:39,013 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand 19 states. [2018-09-23 21:23:39,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:39,151 INFO L93 Difference]: Finished difference Result 111 states and 114 transitions. [2018-09-23 21:23:39,151 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-23 21:23:39,151 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 70 [2018-09-23 21:23:39,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:39,152 INFO L225 Difference]: With dead ends: 111 [2018-09-23 21:23:39,152 INFO L226 Difference]: Without dead ends: 75 [2018-09-23 21:23:39,153 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-09-23 21:23:39,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-09-23 21:23:39,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-09-23 21:23:39,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-09-23 21:23:39,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-09-23 21:23:39,158 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 70 [2018-09-23 21:23:39,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:39,158 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-09-23 21:23:39,158 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-23 21:23:39,159 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-09-23 21:23:39,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-09-23 21:23:39,159 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:39,159 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1] [2018-09-23 21:23:39,159 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:39,160 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:39,160 INFO L82 PathProgramCache]: Analyzing trace with hash -177016449, now seen corresponding path program 17 times [2018-09-23 21:23:39,160 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:39,160 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:39,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:39,161 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:39,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:39,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:39,924 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2018-09-23 21:23:39,924 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:39,924 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 21:23:39,932 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:23:39,999 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-09-23 21:23:39,999 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:40,002 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:40,015 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2018-09-23 21:23:40,045 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:40,045 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-09-23 21:23:40,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-23 21:23:40,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-23 21:23:40,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-09-23 21:23:40,047 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 20 states. [2018-09-23 21:23:40,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:40,148 INFO L93 Difference]: Finished difference Result 117 states and 120 transitions. [2018-09-23 21:23:40,149 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-23 21:23:40,149 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 74 [2018-09-23 21:23:40,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:40,150 INFO L225 Difference]: With dead ends: 117 [2018-09-23 21:23:40,150 INFO L226 Difference]: Without dead ends: 79 [2018-09-23 21:23:40,151 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-09-23 21:23:40,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-09-23 21:23:40,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-09-23 21:23:40,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-09-23 21:23:40,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-09-23 21:23:40,157 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2018-09-23 21:23:40,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:40,157 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-09-23 21:23:40,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-23 21:23:40,158 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-09-23 21:23:40,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-09-23 21:23:40,158 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:40,159 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1] [2018-09-23 21:23:40,159 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:40,159 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:40,159 INFO L82 PathProgramCache]: Analyzing trace with hash 2100176371, now seen corresponding path program 18 times [2018-09-23 21:23:40,159 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:40,159 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:40,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:40,160 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:40,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:40,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:40,599 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2018-09-23 21:23:40,599 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:40,599 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 21:23:40,608 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:23:40,688 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-09-23 21:23:40,688 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:40,692 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:40,708 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2018-09-23 21:23:40,738 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:40,738 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21] total 21 [2018-09-23 21:23:40,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-09-23 21:23:40,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-09-23 21:23:40,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-09-23 21:23:40,739 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 21 states. [2018-09-23 21:23:40,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:40,821 INFO L93 Difference]: Finished difference Result 123 states and 126 transitions. [2018-09-23 21:23:40,821 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-09-23 21:23:40,821 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 78 [2018-09-23 21:23:40,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:40,822 INFO L225 Difference]: With dead ends: 123 [2018-09-23 21:23:40,823 INFO L226 Difference]: Without dead ends: 83 [2018-09-23 21:23:40,824 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-09-23 21:23:40,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-09-23 21:23:40,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2018-09-23 21:23:40,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-09-23 21:23:40,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2018-09-23 21:23:40,829 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 78 [2018-09-23 21:23:40,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:40,830 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2018-09-23 21:23:40,830 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-09-23 21:23:40,830 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2018-09-23 21:23:40,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-09-23 21:23:40,831 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:40,831 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1] [2018-09-23 21:23:40,831 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:40,831 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:40,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1640865895, now seen corresponding path program 19 times [2018-09-23 21:23:40,832 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:40,832 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:40,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:40,833 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:40,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:40,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:41,197 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2018-09-23 21:23:41,197 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:41,198 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 21:23:41,206 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:23:41,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:41,243 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:41,256 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2018-09-23 21:23:41,277 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:41,278 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-09-23 21:23:41,278 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-23 21:23:41,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-23 21:23:41,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-09-23 21:23:41,279 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand 22 states. [2018-09-23 21:23:41,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:41,416 INFO L93 Difference]: Finished difference Result 129 states and 132 transitions. [2018-09-23 21:23:41,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-09-23 21:23:41,417 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 82 [2018-09-23 21:23:41,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:41,418 INFO L225 Difference]: With dead ends: 129 [2018-09-23 21:23:41,418 INFO L226 Difference]: Without dead ends: 87 [2018-09-23 21:23:41,419 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-09-23 21:23:41,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-09-23 21:23:41,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-09-23 21:23:41,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-09-23 21:23:41,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-09-23 21:23:41,425 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 82 [2018-09-23 21:23:41,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:41,425 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-09-23 21:23:41,426 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-23 21:23:41,426 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-09-23 21:23:41,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-09-23 21:23:41,427 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:41,427 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1] [2018-09-23 21:23:41,427 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:41,427 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:41,428 INFO L82 PathProgramCache]: Analyzing trace with hash -1957273381, now seen corresponding path program 20 times [2018-09-23 21:23:41,428 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:41,428 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:41,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:41,429 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:23:41,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:41,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:42,328 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-09-23 21:23:42,329 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:42,329 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 21:23:42,350 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:23:42,404 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:23:42,405 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:42,408 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:42,423 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-09-23 21:23:42,456 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:23:42,456 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-09-23 21:23:42,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-09-23 21:23:42,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-09-23 21:23:42,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-09-23 21:23:42,458 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 23 states. [2018-09-23 21:23:42,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:23:42,694 INFO L93 Difference]: Finished difference Result 135 states and 138 transitions. [2018-09-23 21:23:42,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-09-23 21:23:42,695 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 86 [2018-09-23 21:23:42,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:23:42,696 INFO L225 Difference]: With dead ends: 135 [2018-09-23 21:23:42,696 INFO L226 Difference]: Without dead ends: 91 [2018-09-23 21:23:42,697 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-09-23 21:23:42,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-09-23 21:23:42,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-09-23 21:23:42,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-09-23 21:23:42,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2018-09-23 21:23:42,701 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 86 [2018-09-23 21:23:42,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:23:42,701 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2018-09-23 21:23:42,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-09-23 21:23:42,701 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2018-09-23 21:23:42,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-09-23 21:23:42,702 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:23:42,702 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1] [2018-09-23 21:23:42,702 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:23:42,703 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:23:42,703 INFO L82 PathProgramCache]: Analyzing trace with hash -783456433, now seen corresponding path program 21 times [2018-09-23 21:23:42,703 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:23:42,703 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:23:42,704 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:42,704 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:23:42,704 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:23:42,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:23:43,375 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2018-09-23 21:23:43,375 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:23:43,375 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 21:23:43,383 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:23:43,516 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-09-23 21:23:43,516 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:23:43,519 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:23:43,569 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2018-09-23 21:23:43,571 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-23 21:23:43,617 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-09-23 21:23:43,618 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2018-09-23 21:23:48,795 INFO L303 Elim1Store]: Index analysis took 131 ms [2018-09-23 21:23:48,992 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 9 select indices, 9 select index equivalence classes, 16 disjoint index pairs (out of 36 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 54 treesize of output 289 [2018-09-23 21:23:48,994 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 28