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-d19836b [2018-09-26 21:18:04,694 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-26 21:18:04,696 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-26 21:18:04,714 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-26 21:18:04,714 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-26 21:18:04,716 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-26 21:18:04,717 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-26 21:18:04,720 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-26 21:18:04,722 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-26 21:18:04,723 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-26 21:18:04,731 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-26 21:18:04,731 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-26 21:18:04,732 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-26 21:18:04,733 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-26 21:18:04,736 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-26 21:18:04,738 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-26 21:18:04,741 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-26 21:18:04,744 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-26 21:18:04,748 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-26 21:18:04,750 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-26 21:18:04,751 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-26 21:18:04,754 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-26 21:18:04,760 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-09-26 21:18:04,760 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-09-26 21:18:04,761 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-09-26 21:18:04,762 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-09-26 21:18:04,763 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-09-26 21:18:04,764 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-09-26 21:18:04,767 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-09-26 21:18:04,768 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-09-26 21:18:04,769 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-09-26 21:18:04,770 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-09-26 21:18:04,771 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-09-26 21:18:04,771 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-09-26 21:18:04,772 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-09-26 21:18:04,774 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-09-26 21:18:04,774 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 [2018-09-26 21:18:04,796 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-26 21:18:04,796 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-26 21:18:04,797 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-26 21:18:04,797 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-26 21:18:04,798 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-26 21:18:04,798 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-26 21:18:04,798 INFO L133 SettingsManager]: * Use SBE=true [2018-09-26 21:18:04,799 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-26 21:18:04,799 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-26 21:18:04,799 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-26 21:18:04,799 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-26 21:18:04,800 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-26 21:18:04,800 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-26 21:18:04,801 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-26 21:18:04,801 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-26 21:18:04,801 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-26 21:18:04,801 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-26 21:18:04,801 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-26 21:18:04,802 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-26 21:18:04,802 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-26 21:18:04,802 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-26 21:18:04,803 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-26 21:18:04,804 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-26 21:18:04,804 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-26 21:18:04,804 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-26 21:18:04,804 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-26 21:18:04,805 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-26 21:18:04,805 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-26 21:18:04,805 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-26 21:18:04,805 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-26 21:18:04,873 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-26 21:18:04,888 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-26 21:18:04,895 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-26 21:18:04,897 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-26 21:18:04,898 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-26 21:18:04,898 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/array4.i_4.bpl [2018-09-26 21:18:04,899 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/array4.i_4.bpl' [2018-09-26 21:18:04,972 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-26 21:18:04,976 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-26 21:18:04,977 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-26 21:18:04,977 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-26 21:18:04,977 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-26 21:18:05,000 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 26.09 09:18:04" (1/1) ... [2018-09-26 21:18:05,017 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 26.09 09:18:04" (1/1) ... [2018-09-26 21:18:05,025 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-26 21:18:05,026 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-26 21:18:05,026 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-26 21:18:05,026 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-26 21:18:05,038 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:18:04" (1/1) ... [2018-09-26 21:18:05,038 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:18:04" (1/1) ... [2018-09-26 21:18:05,039 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:18:04" (1/1) ... [2018-09-26 21:18:05,039 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:18:04" (1/1) ... [2018-09-26 21:18:05,042 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:18:04" (1/1) ... [2018-09-26 21:18:05,044 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:18:04" (1/1) ... [2018-09-26 21:18:05,045 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:18:04" (1/1) ... [2018-09-26 21:18:05,047 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-26 21:18:05,047 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-26 21:18:05,048 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-26 21:18:05,048 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-26 21:18:05,049 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:18:04" (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 [2018-09-26 21:18:05,123 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-26 21:18:05,124 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-26 21:18:05,366 INFO L346 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-26 21:18:05,367 INFO L202 PluginConnector]: Adding new model array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.09 09:18:05 BoogieIcfgContainer [2018-09-26 21:18:05,367 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-26 21:18:05,368 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-26 21:18:05,368 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-26 21:18:05,371 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-26 21:18:05,372 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:18:04" (1/2) ... [2018-09-26 21:18:05,373 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2751bbb9 and model type array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.09 09:18:05, skipping insertion in model container [2018-09-26 21:18:05,373 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.09 09:18:05" (2/2) ... [2018-09-26 21:18:05,375 INFO L112 eAbstractionObserver]: Analyzing ICFG array4.i_4.bpl [2018-09-26 21:18:05,385 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-26 21:18:05,393 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-26 21:18:05,446 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-26 21:18:05,447 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-26 21:18:05,447 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-26 21:18:05,448 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-26 21:18:05,448 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-26 21:18:05,448 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-26 21:18:05,448 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-26 21:18:05,449 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-26 21:18:05,449 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-26 21:18:05,465 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states. [2018-09-26 21:18:05,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-26 21:18:05,472 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:05,473 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-09-26 21:18:05,474 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:05,480 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:05,481 INFO L82 PathProgramCache]: Analyzing trace with hash 889539531, now seen corresponding path program 1 times [2018-09-26 21:18:05,483 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:05,484 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:05,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:05,544 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:18:05,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:05,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:05,687 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:18:05,690 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-26 21:18:05,691 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-26 21:18:05,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-26 21:18:05,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-26 21:18:05,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-26 21:18:05,716 INFO L87 Difference]: Start difference. First operand 9 states. Second operand 3 states. [2018-09-26 21:18:05,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:05,836 INFO L93 Difference]: Finished difference Result 17 states and 21 transitions. [2018-09-26 21:18:05,837 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-26 21:18:05,839 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2018-09-26 21:18:05,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:05,850 INFO L225 Difference]: With dead ends: 17 [2018-09-26 21:18:05,851 INFO L226 Difference]: Without dead ends: 11 [2018-09-26 21:18:05,855 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 [2018-09-26 21:18:05,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-26 21:18:05,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-26 21:18:05,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-26 21:18:05,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2018-09-26 21:18:05,917 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 6 [2018-09-26 21:18:05,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:05,917 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2018-09-26 21:18:05,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-26 21:18:05,917 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2018-09-26 21:18:05,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-26 21:18:05,918 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:05,918 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2018-09-26 21:18:05,918 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:05,919 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:05,919 INFO L82 PathProgramCache]: Analyzing trace with hash 1897191999, now seen corresponding path program 1 times [2018-09-26 21:18:05,919 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:05,919 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:05,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:05,920 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:18:05,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:05,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:05,981 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-09-26 21:18:05,981 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:05,981 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 [2018-09-26 21:18:05,990 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:18:06,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:06,032 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:06,053 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-09-26 21:18:06,106 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:06,107 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-09-26 21:18:06,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-26 21:18:06,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-26 21:18:06,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-09-26 21:18:06,109 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 4 states. [2018-09-26 21:18:06,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:06,197 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2018-09-26 21:18:06,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-26 21:18:06,198 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 10 [2018-09-26 21:18:06,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:06,199 INFO L225 Difference]: With dead ends: 21 [2018-09-26 21:18:06,199 INFO L226 Difference]: Without dead ends: 15 [2018-09-26 21:18:06,202 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 [2018-09-26 21:18:06,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-26 21:18:06,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-26 21:18:06,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-26 21:18:06,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-09-26 21:18:06,210 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2018-09-26 21:18:06,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:06,210 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-09-26 21:18:06,211 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-26 21:18:06,211 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-09-26 21:18:06,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-26 21:18:06,212 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:06,213 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1] [2018-09-26 21:18:06,213 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:06,213 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:06,213 INFO L82 PathProgramCache]: Analyzing trace with hash 87273139, now seen corresponding path program 2 times [2018-09-26 21:18:06,213 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:06,214 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:06,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:06,217 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:18:06,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:06,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:06,315 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-09-26 21:18:06,316 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:06,316 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 [2018-09-26 21:18:06,335 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:18:06,366 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:18:06,366 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:06,369 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:06,375 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-09-26 21:18:06,404 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:06,405 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-09-26 21:18:06,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-26 21:18:06,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-26 21:18:06,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-09-26 21:18:06,406 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2018-09-26 21:18:06,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:06,466 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2018-09-26 21:18:06,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-26 21:18:06,467 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2018-09-26 21:18:06,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:06,468 INFO L225 Difference]: With dead ends: 27 [2018-09-26 21:18:06,468 INFO L226 Difference]: Without dead ends: 19 [2018-09-26 21:18:06,468 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 [2018-09-26 21:18:06,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-26 21:18:06,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-26 21:18:06,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-26 21:18:06,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-09-26 21:18:06,474 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-09-26 21:18:06,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:06,474 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-09-26 21:18:06,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-26 21:18:06,474 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-09-26 21:18:06,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-26 21:18:06,475 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:06,475 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1] [2018-09-26 21:18:06,476 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:06,476 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:06,476 INFO L82 PathProgramCache]: Analyzing trace with hash -1310275289, now seen corresponding path program 3 times [2018-09-26 21:18:06,476 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:06,477 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:06,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:06,478 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:06,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:06,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:06,676 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-09-26 21:18:06,676 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:06,677 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 [2018-09-26 21:18:06,690 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:18:06,760 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-26 21:18:06,761 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:06,763 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:06,771 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-09-26 21:18:06,803 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:06,803 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-09-26 21:18:06,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-26 21:18:06,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-26 21:18:06,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-09-26 21:18:06,805 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 6 states. [2018-09-26 21:18:06,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:06,945 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2018-09-26 21:18:06,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-26 21:18:06,946 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2018-09-26 21:18:06,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:06,947 INFO L225 Difference]: With dead ends: 33 [2018-09-26 21:18:06,947 INFO L226 Difference]: Without dead ends: 23 [2018-09-26 21:18:06,948 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 [2018-09-26 21:18:06,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-26 21:18:06,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-26 21:18:06,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-26 21:18:06,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-09-26 21:18:06,953 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2018-09-26 21:18:06,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:06,954 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-09-26 21:18:06,954 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-26 21:18:06,954 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-09-26 21:18:06,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-26 21:18:06,955 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:06,955 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1] [2018-09-26 21:18:06,957 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:06,957 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:06,957 INFO L82 PathProgramCache]: Analyzing trace with hash 1731406235, now seen corresponding path program 4 times [2018-09-26 21:18:06,958 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:06,958 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:06,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:06,959 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:06,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:06,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:07,112 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2018-09-26 21:18:07,113 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:07,113 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 [2018-09-26 21:18:07,130 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:18:07,161 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:18:07,161 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:07,163 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:07,180 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2018-09-26 21:18:07,211 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:07,212 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-26 21:18:07,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-26 21:18:07,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-26 21:18:07,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-09-26 21:18:07,215 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 7 states. [2018-09-26 21:18:07,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:07,277 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2018-09-26 21:18:07,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-26 21:18:07,280 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2018-09-26 21:18:07,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:07,280 INFO L225 Difference]: With dead ends: 39 [2018-09-26 21:18:07,281 INFO L226 Difference]: Without dead ends: 27 [2018-09-26 21:18:07,281 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 [2018-09-26 21:18:07,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-26 21:18:07,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-26 21:18:07,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-26 21:18:07,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-09-26 21:18:07,287 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 22 [2018-09-26 21:18:07,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:07,288 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-09-26 21:18:07,288 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-26 21:18:07,288 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-09-26 21:18:07,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-26 21:18:07,289 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:07,289 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1] [2018-09-26 21:18:07,290 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:07,290 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:07,290 INFO L82 PathProgramCache]: Analyzing trace with hash 77451279, now seen corresponding path program 5 times [2018-09-26 21:18:07,290 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:07,290 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:07,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:07,292 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:07,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:07,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:07,453 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-09-26 21:18:07,454 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:07,454 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 [2018-09-26 21:18:07,468 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:18:07,503 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-26 21:18:07,504 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:07,507 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:07,516 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-09-26 21:18:07,544 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:07,544 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-09-26 21:18:07,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-26 21:18:07,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-26 21:18:07,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-09-26 21:18:07,545 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2018-09-26 21:18:07,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:07,627 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2018-09-26 21:18:07,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-26 21:18:07,628 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-09-26 21:18:07,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:07,629 INFO L225 Difference]: With dead ends: 45 [2018-09-26 21:18:07,629 INFO L226 Difference]: Without dead ends: 31 [2018-09-26 21:18:07,630 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 [2018-09-26 21:18:07,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-26 21:18:07,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-26 21:18:07,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-26 21:18:07,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-09-26 21:18:07,636 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 26 [2018-09-26 21:18:07,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:07,637 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-09-26 21:18:07,637 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-26 21:18:07,637 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-09-26 21:18:07,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-26 21:18:07,638 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:07,638 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1] [2018-09-26 21:18:07,639 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:07,639 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:07,639 INFO L82 PathProgramCache]: Analyzing trace with hash 422296707, now seen corresponding path program 6 times [2018-09-26 21:18:07,639 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:07,640 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:07,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:07,641 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:07,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:07,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:07,870 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-09-26 21:18:07,871 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:07,871 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 [2018-09-26 21:18:07,899 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:18:07,956 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-26 21:18:07,957 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:07,959 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:07,970 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-09-26 21:18:08,000 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:08,001 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 9 [2018-09-26 21:18:08,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-26 21:18:08,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-26 21:18:08,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-09-26 21:18:08,002 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 9 states. [2018-09-26 21:18:08,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:08,191 INFO L93 Difference]: Finished difference Result 51 states and 54 transitions. [2018-09-26 21:18:08,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-26 21:18:08,193 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 30 [2018-09-26 21:18:08,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:08,194 INFO L225 Difference]: With dead ends: 51 [2018-09-26 21:18:08,194 INFO L226 Difference]: Without dead ends: 35 [2018-09-26 21:18:08,195 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-09-26 21:18:08,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-09-26 21:18:08,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-09-26 21:18:08,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-26 21:18:08,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2018-09-26 21:18:08,205 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 30 [2018-09-26 21:18:08,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:08,205 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2018-09-26 21:18:08,205 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-26 21:18:08,205 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2018-09-26 21:18:08,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-26 21:18:08,206 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:08,207 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1] [2018-09-26 21:18:08,207 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:08,207 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:08,207 INFO L82 PathProgramCache]: Analyzing trace with hash -1553862921, now seen corresponding path program 7 times [2018-09-26 21:18:08,208 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:08,208 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:08,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:08,209 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:08,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:08,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:08,678 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2018-09-26 21:18:08,678 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:08,679 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:18:08,693 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:18:08,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:08,729 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:08,740 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2018-09-26 21:18:08,761 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:08,761 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-26 21:18:08,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-26 21:18:08,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-26 21:18:08,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-09-26 21:18:08,767 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 10 states. [2018-09-26 21:18:08,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:08,837 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2018-09-26 21:18:08,841 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-26 21:18:08,841 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 34 [2018-09-26 21:18:08,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:08,842 INFO L225 Difference]: With dead ends: 57 [2018-09-26 21:18:08,843 INFO L226 Difference]: Without dead ends: 39 [2018-09-26 21:18:08,843 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-09-26 21:18:08,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-26 21:18:08,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-09-26 21:18:08,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-26 21:18:08,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-09-26 21:18:08,849 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2018-09-26 21:18:08,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:08,850 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-09-26 21:18:08,850 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-26 21:18:08,850 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-09-26 21:18:08,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-26 21:18:08,851 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:08,851 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1] [2018-09-26 21:18:08,852 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:08,852 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:08,852 INFO L82 PathProgramCache]: Analyzing trace with hash -783980693, now seen corresponding path program 8 times [2018-09-26 21:18:08,852 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:08,853 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:08,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:08,854 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:18:08,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:08,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:09,009 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2018-09-26 21:18:09,009 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:09,009 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 [2018-09-26 21:18:09,023 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:18:09,068 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:18:09,069 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:09,071 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:09,082 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2018-09-26 21:18:09,114 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:09,114 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-09-26 21:18:09,114 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-26 21:18:09,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-26 21:18:09,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-09-26 21:18:09,118 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 11 states. [2018-09-26 21:18:09,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:09,492 INFO L93 Difference]: Finished difference Result 63 states and 66 transitions. [2018-09-26 21:18:09,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-26 21:18:09,493 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 38 [2018-09-26 21:18:09,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:09,494 INFO L225 Difference]: With dead ends: 63 [2018-09-26 21:18:09,494 INFO L226 Difference]: Without dead ends: 43 [2018-09-26 21:18:09,495 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 [2018-09-26 21:18:09,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-09-26 21:18:09,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-09-26 21:18:09,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-09-26 21:18:09,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-09-26 21:18:09,501 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 38 [2018-09-26 21:18:09,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:09,502 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-09-26 21:18:09,502 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-26 21:18:09,502 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-09-26 21:18:09,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-09-26 21:18:09,503 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:09,503 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1] [2018-09-26 21:18:09,503 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:09,504 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:09,504 INFO L82 PathProgramCache]: Analyzing trace with hash -1067768353, now seen corresponding path program 9 times [2018-09-26 21:18:09,504 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:09,504 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:09,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:09,505 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:09,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:09,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:09,723 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2018-09-26 21:18:09,723 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:09,723 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 [2018-09-26 21:18:09,738 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:18:09,875 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-26 21:18:09,876 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:09,879 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:09,893 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2018-09-26 21:18:09,929 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:09,929 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-09-26 21:18:09,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-26 21:18:09,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-26 21:18:09,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-09-26 21:18:09,930 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 12 states. [2018-09-26 21:18:10,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:10,130 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2018-09-26 21:18:10,130 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-26 21:18:10,131 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 42 [2018-09-26 21:18:10,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:10,132 INFO L225 Difference]: With dead ends: 69 [2018-09-26 21:18:10,132 INFO L226 Difference]: Without dead ends: 47 [2018-09-26 21:18:10,133 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 [2018-09-26 21:18:10,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-09-26 21:18:10,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-09-26 21:18:10,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-09-26 21:18:10,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2018-09-26 21:18:10,138 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 42 [2018-09-26 21:18:10,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:10,139 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2018-09-26 21:18:10,139 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-26 21:18:10,139 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2018-09-26 21:18:10,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-09-26 21:18:10,140 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:10,140 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1] [2018-09-26 21:18:10,140 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:10,141 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:10,141 INFO L82 PathProgramCache]: Analyzing trace with hash 1034431059, now seen corresponding path program 10 times [2018-09-26 21:18:10,141 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:10,141 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:10,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:10,142 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:10,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:10,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:10,364 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-09-26 21:18:10,365 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:10,365 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 [2018-09-26 21:18:10,373 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:18:10,408 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:18:10,409 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:10,411 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:10,424 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-09-26 21:18:10,448 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:10,448 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-09-26 21:18:10,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-26 21:18:10,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-26 21:18:10,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-09-26 21:18:10,449 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 13 states. [2018-09-26 21:18:10,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:10,519 INFO L93 Difference]: Finished difference Result 75 states and 78 transitions. [2018-09-26 21:18:10,519 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-26 21:18:10,519 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 46 [2018-09-26 21:18:10,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:10,520 INFO L225 Difference]: With dead ends: 75 [2018-09-26 21:18:10,520 INFO L226 Difference]: Without dead ends: 51 [2018-09-26 21:18:10,521 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 [2018-09-26 21:18:10,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-09-26 21:18:10,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-09-26 21:18:10,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-09-26 21:18:10,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-09-26 21:18:10,527 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 46 [2018-09-26 21:18:10,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:10,528 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-09-26 21:18:10,528 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-26 21:18:10,528 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-09-26 21:18:10,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-09-26 21:18:10,529 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:10,529 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1] [2018-09-26 21:18:10,529 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:10,529 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:10,530 INFO L82 PathProgramCache]: Analyzing trace with hash -2051967801, now seen corresponding path program 11 times [2018-09-26 21:18:10,530 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:10,530 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:10,531 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:10,531 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:10,531 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:10,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:10,751 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-09-26 21:18:10,751 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:10,751 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 [2018-09-26 21:18:10,764 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:18:10,813 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-26 21:18:10,813 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:10,817 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:10,830 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-09-26 21:18:10,854 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:10,854 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-09-26 21:18:10,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-26 21:18:10,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-26 21:18:10,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-09-26 21:18:10,855 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 14 states. [2018-09-26 21:18:10,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:10,917 INFO L93 Difference]: Finished difference Result 81 states and 84 transitions. [2018-09-26 21:18:10,918 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-26 21:18:10,918 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 50 [2018-09-26 21:18:10,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:10,919 INFO L225 Difference]: With dead ends: 81 [2018-09-26 21:18:10,919 INFO L226 Difference]: Without dead ends: 55 [2018-09-26 21:18:10,920 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 [2018-09-26 21:18:10,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-09-26 21:18:10,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-09-26 21:18:10,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-09-26 21:18:10,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2018-09-26 21:18:10,927 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 50 [2018-09-26 21:18:10,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:10,928 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2018-09-26 21:18:10,928 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-26 21:18:10,928 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2018-09-26 21:18:10,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-09-26 21:18:10,929 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:10,929 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1] [2018-09-26 21:18:10,929 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:10,929 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:10,930 INFO L82 PathProgramCache]: Analyzing trace with hash 75236667, now seen corresponding path program 12 times [2018-09-26 21:18:10,930 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:10,930 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:10,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:10,931 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:10,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:10,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:11,161 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2018-09-26 21:18:11,161 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:11,162 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 [2018-09-26 21:18:11,170 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:18:11,270 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-26 21:18:11,270 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:11,274 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:11,289 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2018-09-26 21:18:11,318 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:11,319 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 15 [2018-09-26 21:18:11,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-26 21:18:11,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-26 21:18:11,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-09-26 21:18:11,320 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 15 states. [2018-09-26 21:18:11,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:11,418 INFO L93 Difference]: Finished difference Result 87 states and 90 transitions. [2018-09-26 21:18:11,418 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-26 21:18:11,418 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 54 [2018-09-26 21:18:11,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:11,419 INFO L225 Difference]: With dead ends: 87 [2018-09-26 21:18:11,419 INFO L226 Difference]: Without dead ends: 59 [2018-09-26 21:18:11,419 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-09-26 21:18:11,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-09-26 21:18:11,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-09-26 21:18:11,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-09-26 21:18:11,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2018-09-26 21:18:11,426 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2018-09-26 21:18:11,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:11,426 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2018-09-26 21:18:11,426 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-26 21:18:11,426 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2018-09-26 21:18:11,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-09-26 21:18:11,427 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:11,428 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1] [2018-09-26 21:18:11,428 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:11,428 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:11,428 INFO L82 PathProgramCache]: Analyzing trace with hash 361552815, now seen corresponding path program 13 times [2018-09-26 21:18:11,429 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:11,429 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:11,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:11,430 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:11,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:11,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:11,689 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2018-09-26 21:18:11,689 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:11,689 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 [2018-09-26 21:18:11,698 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:18:11,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:11,735 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:11,750 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2018-09-26 21:18:11,777 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:11,778 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-26 21:18:11,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-26 21:18:11,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-26 21:18:11,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-09-26 21:18:11,779 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand 16 states. [2018-09-26 21:18:11,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:11,869 INFO L93 Difference]: Finished difference Result 93 states and 96 transitions. [2018-09-26 21:18:11,870 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-26 21:18:11,870 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 58 [2018-09-26 21:18:11,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:11,871 INFO L225 Difference]: With dead ends: 93 [2018-09-26 21:18:11,871 INFO L226 Difference]: Without dead ends: 63 [2018-09-26 21:18:11,872 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 [2018-09-26 21:18:11,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-09-26 21:18:11,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-09-26 21:18:11,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-09-26 21:18:11,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-09-26 21:18:11,879 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 58 [2018-09-26 21:18:11,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:11,879 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-09-26 21:18:11,879 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-26 21:18:11,879 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-09-26 21:18:11,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-09-26 21:18:11,880 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:11,880 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1] [2018-09-26 21:18:11,880 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:11,881 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:11,881 INFO L82 PathProgramCache]: Analyzing trace with hash -1008142301, now seen corresponding path program 14 times [2018-09-26 21:18:11,881 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:11,881 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:11,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:11,882 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:18:11,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:11,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:12,223 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-09-26 21:18:12,223 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:12,223 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 [2018-09-26 21:18:12,238 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:18:12,281 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:18:12,282 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:12,285 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:12,314 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-09-26 21:18:12,335 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:12,335 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-09-26 21:18:12,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-26 21:18:12,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-26 21:18:12,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-09-26 21:18:12,336 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 17 states. [2018-09-26 21:18:12,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:12,415 INFO L93 Difference]: Finished difference Result 99 states and 102 transitions. [2018-09-26 21:18:12,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-26 21:18:12,416 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 62 [2018-09-26 21:18:12,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:12,417 INFO L225 Difference]: With dead ends: 99 [2018-09-26 21:18:12,418 INFO L226 Difference]: Without dead ends: 67 [2018-09-26 21:18:12,419 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-09-26 21:18:12,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-09-26 21:18:12,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-09-26 21:18:12,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-09-26 21:18:12,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-09-26 21:18:12,426 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 62 [2018-09-26 21:18:12,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:12,426 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-09-26 21:18:12,426 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-26 21:18:12,427 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-09-26 21:18:12,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-09-26 21:18:12,429 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:12,429 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1] [2018-09-26 21:18:12,429 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:12,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:12,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1978312041, now seen corresponding path program 15 times [2018-09-26 21:18:12,430 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:12,430 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:12,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:12,431 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:12,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:12,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:14,013 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2018-09-26 21:18:14,013 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:14,013 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 [2018-09-26 21:18:14,023 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:18:14,231 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-26 21:18:14,232 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:14,235 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:14,250 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2018-09-26 21:18:14,281 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:14,281 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-09-26 21:18:14,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-26 21:18:14,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-26 21:18:14,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-09-26 21:18:14,282 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 18 states. [2018-09-26 21:18:14,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:14,696 INFO L93 Difference]: Finished difference Result 105 states and 108 transitions. [2018-09-26 21:18:14,696 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-26 21:18:14,697 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 66 [2018-09-26 21:18:14,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:14,698 INFO L225 Difference]: With dead ends: 105 [2018-09-26 21:18:14,698 INFO L226 Difference]: Without dead ends: 71 [2018-09-26 21:18:14,699 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-09-26 21:18:14,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-09-26 21:18:14,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2018-09-26 21:18:14,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-09-26 21:18:14,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2018-09-26 21:18:14,706 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 66 [2018-09-26 21:18:14,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:14,706 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2018-09-26 21:18:14,706 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-26 21:18:14,706 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2018-09-26 21:18:14,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-09-26 21:18:14,707 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:14,708 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1] [2018-09-26 21:18:14,708 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:14,708 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:14,708 INFO L82 PathProgramCache]: Analyzing trace with hash 303497995, now seen corresponding path program 16 times [2018-09-26 21:18:14,708 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:14,709 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:14,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:14,710 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:14,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:14,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:14,989 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2018-09-26 21:18:14,990 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:14,990 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 [2018-09-26 21:18:14,999 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:18:15,027 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:18:15,027 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:15,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:15,043 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2018-09-26 21:18:15,063 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:15,063 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-09-26 21:18:15,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-26 21:18:15,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-26 21:18:15,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-09-26 21:18:15,065 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand 19 states. [2018-09-26 21:18:15,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:15,209 INFO L93 Difference]: Finished difference Result 111 states and 114 transitions. [2018-09-26 21:18:15,209 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-26 21:18:15,209 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 70 [2018-09-26 21:18:15,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:15,210 INFO L225 Difference]: With dead ends: 111 [2018-09-26 21:18:15,210 INFO L226 Difference]: Without dead ends: 75 [2018-09-26 21:18:15,210 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 [2018-09-26 21:18:15,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-09-26 21:18:15,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-09-26 21:18:15,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-09-26 21:18:15,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-09-26 21:18:15,216 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 70 [2018-09-26 21:18:15,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:15,216 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-09-26 21:18:15,216 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-26 21:18:15,216 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-09-26 21:18:15,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-09-26 21:18:15,216 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:15,217 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1] [2018-09-26 21:18:15,217 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:15,217 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:15,217 INFO L82 PathProgramCache]: Analyzing trace with hash -177016449, now seen corresponding path program 17 times [2018-09-26 21:18:15,217 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:15,217 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:15,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:15,218 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:15,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:15,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:15,490 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2018-09-26 21:18:15,490 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:15,490 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 [2018-09-26 21:18:15,497 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:18:15,564 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-09-26 21:18:15,564 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:15,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:15,580 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2018-09-26 21:18:15,611 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:15,611 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-09-26 21:18:15,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-26 21:18:15,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-26 21:18:15,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-09-26 21:18:15,612 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 20 states. [2018-09-26 21:18:15,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:15,701 INFO L93 Difference]: Finished difference Result 117 states and 120 transitions. [2018-09-26 21:18:15,702 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-26 21:18:15,702 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 74 [2018-09-26 21:18:15,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:15,703 INFO L225 Difference]: With dead ends: 117 [2018-09-26 21:18:15,703 INFO L226 Difference]: Without dead ends: 79 [2018-09-26 21:18:15,704 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-09-26 21:18:15,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-09-26 21:18:15,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-09-26 21:18:15,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-09-26 21:18:15,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-09-26 21:18:15,719 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2018-09-26 21:18:15,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:15,720 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-09-26 21:18:15,720 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-26 21:18:15,720 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-09-26 21:18:15,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-09-26 21:18:15,721 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:15,721 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1] [2018-09-26 21:18:15,721 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:15,723 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:15,724 INFO L82 PathProgramCache]: Analyzing trace with hash 2100176371, now seen corresponding path program 18 times [2018-09-26 21:18:15,724 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:15,724 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:15,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:15,725 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:15,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:15,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:16,651 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2018-09-26 21:18:16,652 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:16,652 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 [2018-09-26 21:18:16,661 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:18:16,738 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-09-26 21:18:16,738 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:16,741 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:16,756 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2018-09-26 21:18:16,786 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:16,787 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21] total 21 [2018-09-26 21:18:16,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-09-26 21:18:16,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-09-26 21:18:16,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-09-26 21:18:16,788 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 21 states. [2018-09-26 21:18:16,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:16,923 INFO L93 Difference]: Finished difference Result 123 states and 126 transitions. [2018-09-26 21:18:16,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-09-26 21:18:16,923 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 78 [2018-09-26 21:18:16,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:16,924 INFO L225 Difference]: With dead ends: 123 [2018-09-26 21:18:16,925 INFO L226 Difference]: Without dead ends: 83 [2018-09-26 21:18:16,926 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-09-26 21:18:16,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-09-26 21:18:16,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2018-09-26 21:18:16,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-09-26 21:18:16,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2018-09-26 21:18:16,931 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 78 [2018-09-26 21:18:16,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:16,931 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2018-09-26 21:18:16,931 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-09-26 21:18:16,931 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2018-09-26 21:18:16,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-09-26 21:18:16,932 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:16,932 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1] [2018-09-26 21:18:16,932 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:16,933 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:16,933 INFO L82 PathProgramCache]: Analyzing trace with hash 1640865895, now seen corresponding path program 19 times [2018-09-26 21:18:16,933 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:16,933 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:16,934 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:16,934 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:16,934 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:16,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:17,225 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2018-09-26 21:18:17,225 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:17,225 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-26 21:18:17,234 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:18:17,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:17,274 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:17,294 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2018-09-26 21:18:17,319 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:17,319 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-09-26 21:18:17,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-26 21:18:17,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-26 21:18:17,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-09-26 21:18:17,320 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand 22 states. [2018-09-26 21:18:17,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:17,447 INFO L93 Difference]: Finished difference Result 129 states and 132 transitions. [2018-09-26 21:18:17,448 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-09-26 21:18:17,448 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 82 [2018-09-26 21:18:17,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:17,449 INFO L225 Difference]: With dead ends: 129 [2018-09-26 21:18:17,449 INFO L226 Difference]: Without dead ends: 87 [2018-09-26 21:18:17,450 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-09-26 21:18:17,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-09-26 21:18:17,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-09-26 21:18:17,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-09-26 21:18:17,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-09-26 21:18:17,456 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 82 [2018-09-26 21:18:17,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:17,456 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-09-26 21:18:17,457 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-26 21:18:17,457 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-09-26 21:18:17,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-09-26 21:18:17,458 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:17,458 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1] [2018-09-26 21:18:17,458 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:17,458 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:17,459 INFO L82 PathProgramCache]: Analyzing trace with hash -1957273381, now seen corresponding path program 20 times [2018-09-26 21:18:17,459 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:17,459 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:17,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:17,460 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:18:17,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:17,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:17,891 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-09-26 21:18:17,892 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:17,892 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 [2018-09-26 21:18:17,899 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:18:17,935 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:18:17,935 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:17,937 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:17,951 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-09-26 21:18:17,976 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:18:17,976 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-09-26 21:18:17,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-09-26 21:18:17,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-09-26 21:18:17,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-09-26 21:18:17,977 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 23 states. [2018-09-26 21:18:18,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:18:18,063 INFO L93 Difference]: Finished difference Result 135 states and 138 transitions. [2018-09-26 21:18:18,063 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-09-26 21:18:18,063 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 86 [2018-09-26 21:18:18,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:18:18,064 INFO L225 Difference]: With dead ends: 135 [2018-09-26 21:18:18,064 INFO L226 Difference]: Without dead ends: 91 [2018-09-26 21:18:18,065 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-09-26 21:18:18,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-09-26 21:18:18,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-09-26 21:18:18,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-09-26 21:18:18,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2018-09-26 21:18:18,068 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 86 [2018-09-26 21:18:18,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:18:18,069 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2018-09-26 21:18:18,069 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-09-26 21:18:18,069 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2018-09-26 21:18:18,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-09-26 21:18:18,069 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:18:18,069 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1] [2018-09-26 21:18:18,070 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:18:18,070 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:18:18,070 INFO L82 PathProgramCache]: Analyzing trace with hash -783456433, now seen corresponding path program 21 times [2018-09-26 21:18:18,070 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:18:18,070 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:18:18,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:18,071 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:18:18,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:18:18,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:18:18,464 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2018-09-26 21:18:18,464 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:18:18,465 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 [2018-09-26 21:18:18,473 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:18:18,645 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-09-26 21:18:18,645 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:18:18,648 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:18:18,700 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 [2018-09-26 21:18:18,702 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-26 21:18:18,757 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-09-26 21:18:18,757 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2018-09-26 21:18:24,083 INFO L303 Elim1Store]: Index analysis took 286 ms [2018-09-26 21:18:24,355 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 [2018-09-26 21:18:24,357 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 28