java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_exp_cong.epf -i ../../../trunk/examples/programs/20170319-ConjunctivePathPrograms/count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 16:12:25,715 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 16:12:25,723 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 16:12:25,741 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 16:12:25,741 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 16:12:25,742 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 16:12:25,744 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 16:12:25,745 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 16:12:25,747 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 16:12:25,748 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 16:12:25,749 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-03 16:12:25,749 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-03 16:12:25,750 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-03 16:12:25,751 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-03 16:12:25,752 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-03 16:12:25,753 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-03 16:12:25,754 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-03 16:12:25,755 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-03 16:12:25,757 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-03 16:12:25,759 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-03 16:12:25,760 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-03 16:12:25,761 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-03 16:12:25,764 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-03 16:12:25,765 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-03 16:12:25,765 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-03 16:12:25,769 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-03 16:12:25,770 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-03 16:12:25,770 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-03 16:12:25,773 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-03 16:12:25,775 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-03 16:12:25,775 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-03 16:12:25,775 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-03 16:12:25,776 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-03 16:12:25,776 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-03 16:12:25,777 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-03 16:12:25,777 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-03 16:12:25,779 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_exp_cong.epf [2018-12-03 16:12:25,799 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 16:12:25,801 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 16:12:25,802 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 16:12:25,802 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 16:12:25,802 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 16:12:25,802 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 16:12:25,803 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 16:12:25,803 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 16:12:25,803 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-03 16:12:25,804 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 16:12:25,804 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-03 16:12:25,804 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 16:12:25,804 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 16:12:25,804 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 16:12:25,805 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 16:12:25,805 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 16:12:25,805 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 16:12:25,807 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 16:12:25,807 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 16:12:25,807 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 16:12:25,808 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 16:12:25,808 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 16:12:25,808 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 16:12:25,808 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 16:12:25,808 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 16:12:25,808 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 16:12:25,809 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 16:12:25,809 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 16:12:25,809 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 16:12:25,810 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 16:12:25,810 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 16:12:25,810 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 16:12:25,810 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 16:12:25,810 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 16:12:25,811 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 16:12:25,811 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 16:12:25,811 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 16:12:25,811 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 16:12:25,811 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 16:12:25,812 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 16:12:25,812 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 16:12:25,851 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 16:12:25,862 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 16:12:25,865 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 16:12:25,866 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 16:12:25,867 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 16:12:25,868 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170319-ConjunctivePathPrograms/count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl [2018-12-03 16:12:25,868 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170319-ConjunctivePathPrograms/count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl' [2018-12-03 16:12:25,901 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 16:12:25,903 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 16:12:25,903 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 16:12:25,903 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 16:12:25,904 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 16:12:25,925 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:12:25" (1/1) ... [2018-12-03 16:12:25,934 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:12:25" (1/1) ... [2018-12-03 16:12:25,945 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 16:12:25,946 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 16:12:25,946 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 16:12:25,946 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 16:12:25,959 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:12:25" (1/1) ... [2018-12-03 16:12:25,959 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:12:25" (1/1) ... [2018-12-03 16:12:25,961 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:12:25" (1/1) ... [2018-12-03 16:12:25,961 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:12:25" (1/1) ... [2018-12-03 16:12:25,965 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:12:25" (1/1) ... [2018-12-03 16:12:25,968 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:12:25" (1/1) ... [2018-12-03 16:12:25,968 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:12:25" (1/1) ... [2018-12-03 16:12:25,973 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 16:12:25,974 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 16:12:25,974 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 16:12:25,975 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 16:12:25,975 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:12:25" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 16:12:26,042 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2018-12-03 16:12:26,042 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 16:12:26,043 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 16:12:26,191 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 16:12:26,191 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-03 16:12:26,192 INFO L202 PluginConnector]: Adding new model count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 04:12:26 BoogieIcfgContainer [2018-12-03 16:12:26,192 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 16:12:26,193 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 16:12:26,193 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 16:12:26,196 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 16:12:26,197 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:12:25" (1/2) ... [2018-12-03 16:12:26,198 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61e4cabe and model type count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 04:12:26, skipping insertion in model container [2018-12-03 16:12:26,198 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 04:12:26" (2/2) ... [2018-12-03 16:12:26,200 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl [2018-12-03 16:12:26,210 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 16:12:26,218 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 16:12:26,236 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 16:12:26,271 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 16:12:26,272 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 16:12:26,272 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 16:12:26,272 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 16:12:26,272 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 16:12:26,272 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 16:12:26,273 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 16:12:26,273 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 16:12:26,290 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-12-03 16:12:26,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-12-03 16:12:26,298 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:26,299 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-12-03 16:12:26,309 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:26,318 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:26,319 INFO L82 PathProgramCache]: Analyzing trace with hash 30017, now seen corresponding path program 1 times [2018-12-03 16:12:26,321 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:26,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:26,374 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:26,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:26,374 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:26,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:26,519 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:26,523 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:12:26,523 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-03 16:12:26,523 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:12:26,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 16:12:26,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 16:12:26,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 16:12:26,544 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-12-03 16:12:26,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:26,601 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 16:12:26,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 16:12:26,604 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-12-03 16:12:26,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:26,616 INFO L225 Difference]: With dead ends: 9 [2018-12-03 16:12:26,616 INFO L226 Difference]: Without dead ends: 5 [2018-12-03 16:12:26,619 INFO L631 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 [2018-12-03 16:12:26,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-12-03 16:12:26,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-12-03 16:12:26,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-12-03 16:12:26,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 5 transitions. [2018-12-03 16:12:26,679 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 5 transitions. Word has length 3 [2018-12-03 16:12:26,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:26,680 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 5 transitions. [2018-12-03 16:12:26,680 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 16:12:26,680 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-12-03 16:12:26,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-03 16:12:26,683 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:26,684 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-03 16:12:26,684 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:26,684 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:26,685 INFO L82 PathProgramCache]: Analyzing trace with hash 928552, now seen corresponding path program 1 times [2018-12-03 16:12:26,685 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:26,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:26,686 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:26,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:26,691 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:26,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:26,784 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:26,785 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:26,785 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:26,786 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 5 with the following transitions: [2018-12-03 16:12:26,788 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9] [2018-12-03 16:12:26,826 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:26,827 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:26,995 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:26,997 INFO L272 AbstractInterpreter]: Visited 4 different actions 10 times. Merged at 3 different actions 6 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:12:27,007 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:27,008 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:27,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:27,009 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:12:27,021 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:27,022 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:27,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:27,057 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:27,120 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:27,121 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:27,213 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:27,234 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:27,234 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2018-12-03 16:12:27,234 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:27,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 16:12:27,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 16:12:27,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-12-03 16:12:27,236 INFO L87 Difference]: Start difference. First operand 5 states and 5 transitions. Second operand 5 states. [2018-12-03 16:12:27,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:27,303 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 16:12:27,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 16:12:27,304 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 4 [2018-12-03 16:12:27,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:27,305 INFO L225 Difference]: With dead ends: 9 [2018-12-03 16:12:27,305 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 16:12:27,307 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-12-03 16:12:27,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 16:12:27,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 16:12:27,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 16:12:27,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-12-03 16:12:27,310 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-12-03 16:12:27,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:27,311 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-12-03 16:12:27,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 16:12:27,311 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-12-03 16:12:27,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 16:12:27,312 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:27,312 INFO L402 BasicCegarLoop]: trace histogram [3, 1, 1, 1] [2018-12-03 16:12:27,313 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:27,313 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:27,313 INFO L82 PathProgramCache]: Analyzing trace with hash 892275272, now seen corresponding path program 2 times [2018-12-03 16:12:27,313 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:27,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:27,315 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:27,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:27,315 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:27,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:27,424 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:27,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:27,425 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:27,425 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:12:27,426 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:12:27,426 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:27,426 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:12:27,437 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:12:27,437 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:12:27,468 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 16:12:27,468 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:12:27,469 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:27,582 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:27,583 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:27,892 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:27,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:27,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-12-03 16:12:27,913 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:27,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:12:27,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:12:27,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2018-12-03 16:12:27,914 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 7 states. [2018-12-03 16:12:28,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:28,099 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-12-03 16:12:28,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 16:12:28,100 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 6 [2018-12-03 16:12:28,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:28,101 INFO L225 Difference]: With dead ends: 11 [2018-12-03 16:12:28,101 INFO L226 Difference]: Without dead ends: 9 [2018-12-03 16:12:28,102 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2018-12-03 16:12:28,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-12-03 16:12:28,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-12-03 16:12:28,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 16:12:28,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-12-03 16:12:28,107 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-12-03 16:12:28,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:28,107 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-12-03 16:12:28,108 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:12:28,108 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-12-03 16:12:28,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 16:12:28,108 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:28,109 INFO L402 BasicCegarLoop]: trace histogram [5, 1, 1, 1] [2018-12-03 16:12:28,110 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:28,110 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:28,110 INFO L82 PathProgramCache]: Analyzing trace with hash -1516986008, now seen corresponding path program 3 times [2018-12-03 16:12:28,110 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:28,111 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:28,112 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:12:28,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:28,112 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:28,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:28,306 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:28,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:28,306 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:28,307 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:12:28,307 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:12:28,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:28,308 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:12:28,327 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:12:28,327 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:12:28,341 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:12:28,342 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:12:28,345 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:28,442 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:28,442 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:29,068 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:29,087 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:29,087 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2018-12-03 16:12:29,087 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:29,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 16:12:29,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 16:12:29,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=145, Unknown=0, NotChecked=0, Total=210 [2018-12-03 16:12:29,089 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 9 states. [2018-12-03 16:12:29,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:29,280 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2018-12-03 16:12:29,280 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 16:12:29,281 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 8 [2018-12-03 16:12:29,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:29,281 INFO L225 Difference]: With dead ends: 13 [2018-12-03 16:12:29,282 INFO L226 Difference]: Without dead ends: 11 [2018-12-03 16:12:29,283 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=129, Invalid=251, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:12:29,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-12-03 16:12:29,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-12-03 16:12:29,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-12-03 16:12:29,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-12-03 16:12:29,287 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-12-03 16:12:29,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:29,287 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-12-03 16:12:29,288 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 16:12:29,288 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-12-03 16:12:29,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 16:12:29,288 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:29,289 INFO L402 BasicCegarLoop]: trace histogram [7, 1, 1, 1] [2018-12-03 16:12:29,289 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:29,289 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:29,289 INFO L82 PathProgramCache]: Analyzing trace with hash -1829703544, now seen corresponding path program 4 times [2018-12-03 16:12:29,290 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:29,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:29,291 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:12:29,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:29,291 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:29,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:29,774 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:29,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:29,775 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:29,776 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:12:29,776 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:12:29,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:29,777 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:12:29,786 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:29,786 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:29,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:29,796 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:29,846 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:29,846 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:30,183 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:30,202 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:30,202 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2018-12-03 16:12:30,202 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:30,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 16:12:30,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 16:12:30,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2018-12-03 16:12:30,204 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 11 states. [2018-12-03 16:12:30,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:30,425 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2018-12-03 16:12:30,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 16:12:30,426 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 10 [2018-12-03 16:12:30,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:30,426 INFO L225 Difference]: With dead ends: 15 [2018-12-03 16:12:30,427 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 16:12:30,427 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:12:30,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 16:12:30,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-12-03 16:12:30,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-12-03 16:12:30,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-12-03 16:12:30,433 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-12-03 16:12:30,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:30,434 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-12-03 16:12:30,434 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 16:12:30,434 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-12-03 16:12:30,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 16:12:30,435 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:30,435 INFO L402 BasicCegarLoop]: trace histogram [9, 1, 1, 1] [2018-12-03 16:12:30,435 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:30,435 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:30,435 INFO L82 PathProgramCache]: Analyzing trace with hash -1703544920, now seen corresponding path program 5 times [2018-12-03 16:12:30,435 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:30,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:30,437 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:30,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:30,437 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:30,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:30,944 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:30,944 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:30,944 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:30,944 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:12:30,945 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:12:30,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:30,945 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:12:30,954 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:12:30,954 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:12:30,977 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 16:12:30,977 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:12:30,978 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:31,005 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:31,005 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:31,326 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:31,345 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:31,345 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-12-03 16:12:31,346 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:31,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 16:12:31,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 16:12:31,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=303, Unknown=0, NotChecked=0, Total=462 [2018-12-03 16:12:31,347 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 13 states. [2018-12-03 16:12:31,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:31,722 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2018-12-03 16:12:31,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 16:12:31,725 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 12 [2018-12-03 16:12:31,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:31,726 INFO L225 Difference]: With dead ends: 17 [2018-12-03 16:12:31,726 INFO L226 Difference]: Without dead ends: 15 [2018-12-03 16:12:31,727 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=339, Invalid=591, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:12:31,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-12-03 16:12:31,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-12-03 16:12:31,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 16:12:31,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-12-03 16:12:31,731 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-12-03 16:12:31,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:31,732 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-12-03 16:12:31,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 16:12:31,732 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-12-03 16:12:31,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 16:12:31,732 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:31,733 INFO L402 BasicCegarLoop]: trace histogram [11, 1, 1, 1] [2018-12-03 16:12:31,733 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:31,733 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:31,734 INFO L82 PathProgramCache]: Analyzing trace with hash -724191544, now seen corresponding path program 6 times [2018-12-03 16:12:31,734 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:31,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:31,735 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:12:31,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:31,735 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:31,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:32,215 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:32,215 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:32,215 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:32,216 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:12:32,216 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:12:32,217 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:32,217 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:12:32,233 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:12:32,233 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:12:32,249 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:12:32,249 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:12:32,252 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:32,362 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:32,362 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:32,808 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:32,828 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:32,829 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2018-12-03 16:12:32,829 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:32,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 16:12:32,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 16:12:32,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=472, Unknown=0, NotChecked=0, Total=702 [2018-12-03 16:12:32,830 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 15 states. [2018-12-03 16:12:33,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:33,297 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2018-12-03 16:12:33,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 16:12:33,300 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 14 [2018-12-03 16:12:33,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:33,301 INFO L225 Difference]: With dead ends: 19 [2018-12-03 16:12:33,301 INFO L226 Difference]: Without dead ends: 17 [2018-12-03 16:12:33,303 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=504, Invalid=902, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 16:12:33,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-12-03 16:12:33,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-12-03 16:12:33,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-03 16:12:33,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-12-03 16:12:33,308 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-12-03 16:12:33,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:33,308 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-12-03 16:12:33,308 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 16:12:33,308 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-12-03 16:12:33,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 16:12:33,309 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:33,309 INFO L402 BasicCegarLoop]: trace histogram [13, 1, 1, 1] [2018-12-03 16:12:33,309 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:33,310 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:33,310 INFO L82 PathProgramCache]: Analyzing trace with hash -163435032, now seen corresponding path program 7 times [2018-12-03 16:12:33,310 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:33,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:33,311 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:12:33,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:33,312 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:33,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:33,932 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:33,932 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:33,932 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:33,933 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:12:33,933 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:12:33,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:33,933 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:12:33,942 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:33,942 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:33,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:33,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:34,026 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:34,027 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:34,546 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:34,565 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:34,565 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 30 [2018-12-03 16:12:34,565 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:34,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:12:34,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:12:34,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=621, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:12:34,568 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 17 states. [2018-12-03 16:12:35,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:35,051 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2018-12-03 16:12:35,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 16:12:35,052 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 16 [2018-12-03 16:12:35,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:35,053 INFO L225 Difference]: With dead ends: 21 [2018-12-03 16:12:35,053 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 16:12:35,055 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=685, Invalid=1207, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 16:12:35,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 16:12:35,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-12-03 16:12:35,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 16:12:35,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-12-03 16:12:35,060 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-12-03 16:12:35,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:35,061 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-12-03 16:12:35,061 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:12:35,061 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-12-03 16:12:35,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 16:12:35,061 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:35,062 INFO L402 BasicCegarLoop]: trace histogram [15, 1, 1, 1] [2018-12-03 16:12:35,062 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:35,062 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:35,062 INFO L82 PathProgramCache]: Analyzing trace with hash 1852661000, now seen corresponding path program 8 times [2018-12-03 16:12:35,063 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:35,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:35,064 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:35,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:35,064 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:35,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:35,337 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:35,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:35,338 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:35,338 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:12:35,338 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:12:35,338 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:35,339 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:12:35,351 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:12:35,352 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:12:35,365 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 16:12:35,365 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:12:35,368 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:35,426 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:35,426 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:36,340 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:36,359 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:36,360 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-12-03 16:12:36,360 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:36,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 16:12:36,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 16:12:36,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=396, Invalid=726, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 16:12:36,361 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 19 states. [2018-12-03 16:12:37,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:37,069 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2018-12-03 16:12:37,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 16:12:37,070 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 18 [2018-12-03 16:12:37,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:37,071 INFO L225 Difference]: With dead ends: 23 [2018-12-03 16:12:37,071 INFO L226 Difference]: Without dead ends: 21 [2018-12-03 16:12:37,072 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=876, Invalid=1476, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 16:12:37,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-12-03 16:12:37,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-12-03 16:12:37,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 16:12:37,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-12-03 16:12:37,078 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-12-03 16:12:37,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:37,078 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-12-03 16:12:37,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 16:12:37,078 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-12-03 16:12:37,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 16:12:37,079 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:37,079 INFO L402 BasicCegarLoop]: trace histogram [17, 1, 1, 1] [2018-12-03 16:12:37,079 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:37,079 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:37,079 INFO L82 PathProgramCache]: Analyzing trace with hash -2004270040, now seen corresponding path program 9 times [2018-12-03 16:12:37,079 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:37,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:37,080 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:12:37,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:37,080 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:37,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:37,499 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:37,499 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:37,500 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:37,500 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:12:37,500 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:12:37,500 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:37,500 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:12:37,511 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:12:37,511 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:12:37,534 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:12:37,535 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:12:37,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:37,641 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:37,642 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:38,491 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:38,511 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:38,511 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 38 [2018-12-03 16:12:38,511 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:38,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 16:12:38,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 16:12:38,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=503, Invalid=979, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 16:12:38,513 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 21 states. [2018-12-03 16:12:38,931 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 11 [2018-12-03 16:12:39,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:39,630 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-12-03 16:12:39,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 16:12:39,630 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 20 [2018-12-03 16:12:39,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:39,631 INFO L225 Difference]: With dead ends: 25 [2018-12-03 16:12:39,631 INFO L226 Difference]: Without dead ends: 23 [2018-12-03 16:12:39,632 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1131, Invalid=1949, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 16:12:39,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-03 16:12:39,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-12-03 16:12:39,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-12-03 16:12:39,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-12-03 16:12:39,638 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-12-03 16:12:39,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:39,639 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-12-03 16:12:39,639 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 16:12:39,639 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-12-03 16:12:39,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-12-03 16:12:39,640 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:39,640 INFO L402 BasicCegarLoop]: trace histogram [19, 1, 1, 1] [2018-12-03 16:12:39,640 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:39,640 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:39,640 INFO L82 PathProgramCache]: Analyzing trace with hash -1958223032, now seen corresponding path program 10 times [2018-12-03 16:12:39,641 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:39,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:39,642 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:12:39,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:39,642 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:39,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:39,963 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:39,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:39,964 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:39,964 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:12:39,964 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:12:39,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:39,964 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:12:39,973 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:39,973 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:39,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:39,998 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:40,056 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:40,056 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:40,836 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:40,862 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:40,862 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 42 [2018-12-03 16:12:40,863 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:40,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 16:12:40,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 16:12:40,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=618, Invalid=1188, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 16:12:40,864 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 23 states. [2018-12-03 16:12:41,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:41,753 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2018-12-03 16:12:41,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 16:12:41,753 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 22 [2018-12-03 16:12:41,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:41,754 INFO L225 Difference]: With dead ends: 27 [2018-12-03 16:12:41,754 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 16:12:41,756 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1396, Invalid=2386, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 16:12:41,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 16:12:41,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-12-03 16:12:41,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 16:12:41,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-12-03 16:12:41,760 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-12-03 16:12:41,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:41,760 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-12-03 16:12:41,760 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 16:12:41,760 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-12-03 16:12:41,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 16:12:41,761 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:41,761 INFO L402 BasicCegarLoop]: trace histogram [21, 1, 1, 1] [2018-12-03 16:12:41,761 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:41,761 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:41,761 INFO L82 PathProgramCache]: Analyzing trace with hash -656721304, now seen corresponding path program 11 times [2018-12-03 16:12:41,762 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:41,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:41,762 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:41,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:41,763 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:41,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:42,132 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:42,132 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:42,132 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:42,132 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:12:42,133 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:12:42,133 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:42,133 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:12:42,151 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:12:42,152 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:12:42,188 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-03 16:12:42,188 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:12:42,191 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:42,245 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:42,246 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:43,402 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:43,422 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:43,422 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-12-03 16:12:43,422 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:43,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-03 16:12:43,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-03 16:12:43,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=1329, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 16:12:43,424 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 25 states. [2018-12-03 16:12:44,380 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2018-12-03 16:12:44,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:44,538 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2018-12-03 16:12:44,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 16:12:44,539 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 24 [2018-12-03 16:12:44,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:44,540 INFO L225 Difference]: With dead ends: 29 [2018-12-03 16:12:44,540 INFO L226 Difference]: Without dead ends: 27 [2018-12-03 16:12:44,543 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1665, Invalid=2757, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 16:12:44,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-03 16:12:44,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-03 16:12:44,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 16:12:44,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-12-03 16:12:44,549 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-12-03 16:12:44,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:44,549 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-12-03 16:12:44,549 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-03 16:12:44,550 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-12-03 16:12:44,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 16:12:44,550 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:44,550 INFO L402 BasicCegarLoop]: trace histogram [23, 1, 1, 1] [2018-12-03 16:12:44,551 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:44,551 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:44,551 INFO L82 PathProgramCache]: Analyzing trace with hash 250956168, now seen corresponding path program 12 times [2018-12-03 16:12:44,551 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:44,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:44,552 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:12:44,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:44,552 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:44,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:45,003 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:45,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:45,004 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:45,004 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:12:45,004 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:12:45,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:45,004 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:12:45,013 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:12:45,013 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:12:45,061 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:12:45,061 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:12:45,075 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:45,285 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:45,285 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:46,734 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:46,752 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:46,752 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2018-12-03 16:12:46,753 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:46,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 16:12:46,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 16:12:46,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=884, Invalid=1666, Unknown=0, NotChecked=0, Total=2550 [2018-12-03 16:12:46,754 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 27 states. [2018-12-03 16:12:48,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:48,386 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-12-03 16:12:48,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 16:12:48,388 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 26 [2018-12-03 16:12:48,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:48,389 INFO L225 Difference]: With dead ends: 31 [2018-12-03 16:12:48,389 INFO L226 Difference]: Without dead ends: 29 [2018-12-03 16:12:48,391 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2010, Invalid=3392, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 16:12:48,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-12-03 16:12:48,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-12-03 16:12:48,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-12-03 16:12:48,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-12-03 16:12:48,395 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-12-03 16:12:48,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:48,396 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-12-03 16:12:48,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 16:12:48,396 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-12-03 16:12:48,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-12-03 16:12:48,396 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:48,396 INFO L402 BasicCegarLoop]: trace histogram [25, 1, 1, 1] [2018-12-03 16:12:48,397 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:48,397 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:48,397 INFO L82 PathProgramCache]: Analyzing trace with hash 650645672, now seen corresponding path program 13 times [2018-12-03 16:12:48,397 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:48,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:48,398 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:12:48,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:48,398 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:48,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:48,905 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:48,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:48,906 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:48,906 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:12:48,907 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:12:48,907 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:48,907 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:12:48,916 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:48,916 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:48,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:48,955 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:49,042 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:49,042 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:50,071 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:50,090 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:50,090 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 54 [2018-12-03 16:12:50,090 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:50,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 16:12:50,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 16:12:50,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1935, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 16:12:50,092 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 29 states. [2018-12-03 16:12:50,427 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 11 [2018-12-03 16:12:51,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:51,841 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2018-12-03 16:12:51,841 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 16:12:51,841 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 28 [2018-12-03 16:12:51,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:51,842 INFO L225 Difference]: With dead ends: 33 [2018-12-03 16:12:51,842 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 16:12:51,845 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2359, Invalid=3961, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 16:12:51,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 16:12:51,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-12-03 16:12:51,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 16:12:51,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-12-03 16:12:51,851 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-12-03 16:12:51,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:51,851 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-12-03 16:12:51,851 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 16:12:51,852 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-12-03 16:12:51,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 16:12:51,852 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:51,852 INFO L402 BasicCegarLoop]: trace histogram [27, 1, 1, 1] [2018-12-03 16:12:51,853 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:51,853 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:51,853 INFO L82 PathProgramCache]: Analyzing trace with hash -1794797624, now seen corresponding path program 14 times [2018-12-03 16:12:51,853 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:51,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:51,854 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:51,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:51,854 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:51,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:52,387 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:52,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:52,388 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:52,388 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:12:52,388 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:12:52,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:52,389 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:12:52,401 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:12:52,401 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:12:52,421 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-03 16:12:52,422 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:12:52,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:52,464 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:52,464 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:53,688 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:53,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:53,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-12-03 16:12:53,708 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:53,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-12-03 16:12:53,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-12-03 16:12:53,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1194, Invalid=2112, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 16:12:53,710 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 31 states. [2018-12-03 16:12:55,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:55,251 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2018-12-03 16:12:55,251 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 16:12:55,252 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 30 [2018-12-03 16:12:55,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:55,253 INFO L225 Difference]: With dead ends: 35 [2018-12-03 16:12:55,253 INFO L226 Difference]: Without dead ends: 33 [2018-12-03 16:12:55,256 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2706, Invalid=4434, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 16:12:55,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-03 16:12:55,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-12-03 16:12:55,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-03 16:12:55,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-12-03 16:12:55,260 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-12-03 16:12:55,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:55,261 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-12-03 16:12:55,261 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-12-03 16:12:55,261 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-12-03 16:12:55,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 16:12:55,261 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:55,262 INFO L402 BasicCegarLoop]: trace histogram [29, 1, 1, 1] [2018-12-03 16:12:55,262 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:55,262 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:55,262 INFO L82 PathProgramCache]: Analyzing trace with hash 1776273128, now seen corresponding path program 15 times [2018-12-03 16:12:55,262 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:55,263 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:55,263 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:12:55,263 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:55,263 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:55,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:55,802 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:55,802 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:55,803 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:55,803 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:12:55,803 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:12:55,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:55,803 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:12:55,814 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:12:55,815 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:12:55,853 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:12:55,854 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:12:55,871 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:56,690 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:56,690 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:58,471 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:58,492 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:58,492 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 62 [2018-12-03 16:12:58,492 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:58,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-12-03 16:12:58,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-12-03 16:12:58,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1373, Invalid=2533, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 16:12:58,495 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 33 states. [2018-12-03 16:13:00,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:00,379 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-12-03 16:13:00,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 16:13:00,380 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 32 [2018-12-03 16:13:00,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:00,381 INFO L225 Difference]: With dead ends: 37 [2018-12-03 16:13:00,381 INFO L226 Difference]: Without dead ends: 35 [2018-12-03 16:13:00,385 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3141, Invalid=5231, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 16:13:00,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-12-03 16:13:00,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-12-03 16:13:00,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-12-03 16:13:00,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-12-03 16:13:00,390 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-12-03 16:13:00,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:00,391 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-12-03 16:13:00,391 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-12-03 16:13:00,391 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-12-03 16:13:00,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-12-03 16:13:00,392 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:00,392 INFO L402 BasicCegarLoop]: trace histogram [31, 1, 1, 1] [2018-12-03 16:13:00,392 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:00,392 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:00,392 INFO L82 PathProgramCache]: Analyzing trace with hash 1896396296, now seen corresponding path program 16 times [2018-12-03 16:13:00,393 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:00,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:00,394 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:13:00,394 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:00,394 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:00,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:01,985 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:01,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:01,985 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:01,986 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:13:01,986 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:13:01,986 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:01,986 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:13:01,996 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:01,996 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:13:02,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:02,059 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:02,118 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:02,118 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:03,648 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:03,666 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:03,666 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 66 [2018-12-03 16:13:03,666 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:03,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 16:13:03,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 16:13:03,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1560, Invalid=2862, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 16:13:03,669 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 35 states. [2018-12-03 16:13:05,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:05,738 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-12-03 16:13:05,738 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 16:13:05,738 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 34 [2018-12-03 16:13:05,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:05,739 INFO L225 Difference]: With dead ends: 39 [2018-12-03 16:13:05,739 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 16:13:05,742 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=3574, Invalid=5932, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 16:13:05,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 16:13:05,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-12-03 16:13:05,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 16:13:05,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-12-03 16:13:05,746 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-12-03 16:13:05,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:05,746 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-12-03 16:13:05,746 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 16:13:05,746 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-12-03 16:13:05,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-12-03 16:13:05,747 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:05,747 INFO L402 BasicCegarLoop]: trace histogram [33, 1, 1, 1] [2018-12-03 16:13:05,747 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:05,747 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:05,747 INFO L82 PathProgramCache]: Analyzing trace with hash 1370643752, now seen corresponding path program 17 times [2018-12-03 16:13:05,747 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:05,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:05,748 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:05,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:05,748 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:05,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:06,885 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:06,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:06,885 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:06,885 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:13:06,886 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:13:06,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:06,886 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:13:06,900 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:13:06,900 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:13:06,964 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-03 16:13:06,965 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:13:06,967 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:07,033 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:07,034 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:08,675 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:08,694 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:08,694 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-12-03 16:13:08,694 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:08,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-12-03 16:13:08,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-12-03 16:13:08,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1755, Invalid=3075, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 16:13:08,695 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 37 states. [2018-12-03 16:13:11,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:11,164 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2018-12-03 16:13:11,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 16:13:11,164 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 36 [2018-12-03 16:13:11,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:11,165 INFO L225 Difference]: With dead ends: 41 [2018-12-03 16:13:11,165 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 16:13:11,167 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=3999, Invalid=6507, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 16:13:11,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 16:13:11,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-12-03 16:13:11,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 16:13:11,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-12-03 16:13:11,175 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-12-03 16:13:11,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:11,175 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-12-03 16:13:11,175 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-12-03 16:13:11,175 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-12-03 16:13:11,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 16:13:11,176 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:11,176 INFO L402 BasicCegarLoop]: trace histogram [35, 1, 1, 1] [2018-12-03 16:13:11,176 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:11,176 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:11,176 INFO L82 PathProgramCache]: Analyzing trace with hash -1366377400, now seen corresponding path program 18 times [2018-12-03 16:13:11,176 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:11,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:11,178 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:13:11,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:11,178 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:11,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:12,217 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:12,217 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:12,218 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:12,218 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:13:12,218 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:13:12,218 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:12,218 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:13:12,228 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:13:12,228 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:13:12,281 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:13:12,281 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:13:12,308 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:12,384 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:12,384 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:14,367 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:14,388 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:14,388 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 74 [2018-12-03 16:13:14,389 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:14,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-12-03 16:13:14,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-12-03 16:13:14,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1970, Invalid=3580, Unknown=0, NotChecked=0, Total=5550 [2018-12-03 16:13:14,390 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 39 states. [2018-12-03 16:13:17,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:17,407 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-12-03 16:13:17,407 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 16:13:17,408 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 38 [2018-12-03 16:13:17,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:17,409 INFO L225 Difference]: With dead ends: 43 [2018-12-03 16:13:17,409 INFO L226 Difference]: Without dead ends: 41 [2018-12-03 16:13:17,411 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 702 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=4524, Invalid=7466, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 16:13:17,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-12-03 16:13:17,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-12-03 16:13:17,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-12-03 16:13:17,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-12-03 16:13:17,418 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-12-03 16:13:17,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:17,418 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-12-03 16:13:17,418 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-12-03 16:13:17,418 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-12-03 16:13:17,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-12-03 16:13:17,419 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:17,419 INFO L402 BasicCegarLoop]: trace histogram [37, 1, 1, 1] [2018-12-03 16:13:17,419 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:17,420 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:17,420 INFO L82 PathProgramCache]: Analyzing trace with hash 1171247976, now seen corresponding path program 19 times [2018-12-03 16:13:17,420 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:17,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:17,421 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:13:17,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:17,421 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:17,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:18,252 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:18,252 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:18,252 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:18,252 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:13:18,252 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:13:18,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:18,253 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:13:18,263 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:18,263 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:13:18,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:18,357 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:18,455 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:18,456 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:20,478 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:20,496 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:20,497 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 78 [2018-12-03 16:13:20,497 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:20,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 16:13:20,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 16:13:20,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2193, Invalid=3969, Unknown=0, NotChecked=0, Total=6162 [2018-12-03 16:13:20,499 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 41 states. [2018-12-03 16:13:23,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:23,547 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2018-12-03 16:13:23,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 16:13:23,548 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 40 [2018-12-03 16:13:23,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:23,549 INFO L225 Difference]: With dead ends: 45 [2018-12-03 16:13:23,549 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 16:13:23,550 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 779 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=5041, Invalid=8299, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 16:13:23,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 16:13:23,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-12-03 16:13:23,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-12-03 16:13:23,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-12-03 16:13:23,556 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2018-12-03 16:13:23,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:23,556 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-12-03 16:13:23,556 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 16:13:23,556 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-12-03 16:13:23,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 16:13:23,557 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:23,557 INFO L402 BasicCegarLoop]: trace histogram [39, 1, 1, 1] [2018-12-03 16:13:23,557 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:23,557 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:23,557 INFO L82 PathProgramCache]: Analyzing trace with hash 287810184, now seen corresponding path program 20 times [2018-12-03 16:13:23,557 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:23,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:23,558 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:23,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:23,558 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:23,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:24,492 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:24,492 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:24,493 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:24,493 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:13:24,493 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:13:24,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:24,493 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:13:24,502 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:13:24,502 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:13:24,528 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-12-03 16:13:24,528 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:13:24,530 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:24,597 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:24,598 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:26,836 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:26,856 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:26,856 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-12-03 16:13:26,856 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:26,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-12-03 16:13:26,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-12-03 16:13:26,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2424, Invalid=4218, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 16:13:26,858 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 43 states. [2018-12-03 16:13:30,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:30,256 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2018-12-03 16:13:30,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 16:13:30,257 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 42 [2018-12-03 16:13:30,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:30,257 INFO L225 Difference]: With dead ends: 47 [2018-12-03 16:13:30,258 INFO L226 Difference]: Without dead ends: 45 [2018-12-03 16:13:30,259 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=5544, Invalid=8976, Unknown=0, NotChecked=0, Total=14520 [2018-12-03 16:13:30,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-12-03 16:13:30,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-12-03 16:13:30,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 16:13:30,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-12-03 16:13:30,266 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2018-12-03 16:13:30,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:30,266 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-12-03 16:13:30,266 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-12-03 16:13:30,266 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-12-03 16:13:30,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 16:13:30,267 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:30,267 INFO L402 BasicCegarLoop]: trace histogram [41, 1, 1, 1] [2018-12-03 16:13:30,267 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:30,267 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:30,268 INFO L82 PathProgramCache]: Analyzing trace with hash 1707616680, now seen corresponding path program 21 times [2018-12-03 16:13:30,268 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:30,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:30,269 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:13:30,269 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:30,269 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:30,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:31,260 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:31,260 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:31,260 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:31,260 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:13:31,261 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:13:31,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:31,261 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2018-12-03 16:13:31,270 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:13:31,271 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:13:31,348 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:13:31,348 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:13:31,386 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:31,481 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:31,481 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:34,486 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:34,504 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:34,505 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 86 [2018-12-03 16:13:34,505 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:34,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 16:13:34,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 16:13:34,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2675, Invalid=4807, Unknown=0, NotChecked=0, Total=7482 [2018-12-03 16:13:34,507 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 45 states. [2018-12-03 16:13:34,862 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 11 [2018-12-03 16:13:38,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:38,355 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-12-03 16:13:38,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 16:13:38,357 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 44 [2018-12-03 16:13:38,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:38,357 INFO L225 Difference]: With dead ends: 49 [2018-12-03 16:13:38,357 INFO L226 Difference]: Without dead ends: 47 [2018-12-03 16:13:38,358 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 945 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=6159, Invalid=10097, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 16:13:38,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-12-03 16:13:38,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-12-03 16:13:38,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-12-03 16:13:38,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-12-03 16:13:38,364 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2018-12-03 16:13:38,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:38,364 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-12-03 16:13:38,364 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 16:13:38,364 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-12-03 16:13:38,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-12-03 16:13:38,365 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:38,365 INFO L402 BasicCegarLoop]: trace histogram [43, 1, 1, 1] [2018-12-03 16:13:38,365 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:38,365 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:38,365 INFO L82 PathProgramCache]: Analyzing trace with hash 342059208, now seen corresponding path program 22 times [2018-12-03 16:13:38,365 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:38,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:38,366 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:13:38,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:38,366 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:38,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:39,442 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:39,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:39,442 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:39,443 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:13:39,443 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:13:39,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:39,443 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:13:39,452 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:39,452 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:13:39,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:39,587 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:39,664 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:39,664 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:42,490 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:42,509 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:42,509 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 90 [2018-12-03 16:13:42,509 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:42,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 16:13:42,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 16:13:42,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2934, Invalid=5256, Unknown=0, NotChecked=0, Total=8190 [2018-12-03 16:13:42,511 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 47 states. [2018-12-03 16:13:42,781 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 9 [2018-12-03 16:13:46,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:46,700 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2018-12-03 16:13:46,707 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 16:13:46,707 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 46 [2018-12-03 16:13:46,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:46,708 INFO L225 Difference]: With dead ends: 51 [2018-12-03 16:13:46,708 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 16:13:46,709 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1034 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=6760, Invalid=11062, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 16:13:46,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 16:13:46,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-12-03 16:13:46,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 16:13:46,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-12-03 16:13:46,715 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2018-12-03 16:13:46,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:46,715 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-12-03 16:13:46,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 16:13:46,716 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-12-03 16:13:46,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 16:13:46,716 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:46,716 INFO L402 BasicCegarLoop]: trace histogram [45, 1, 1, 1] [2018-12-03 16:13:46,717 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:46,717 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:46,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1993646104, now seen corresponding path program 23 times [2018-12-03 16:13:46,717 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:46,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:46,718 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:46,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:46,718 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:46,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:48,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:48,040 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:48,040 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:48,040 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:13:48,040 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:13:48,040 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:48,040 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:13:48,049 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:13:48,049 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:13:48,128 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 16:13:48,128 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:13:48,130 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:48,448 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:48,448 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:51,308 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:51,327 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:51,327 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-12-03 16:13:51,327 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:51,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-12-03 16:13:51,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-12-03 16:13:51,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3201, Invalid=5541, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 16:13:51,329 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 49 states. [2018-12-03 16:13:56,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:56,002 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2018-12-03 16:13:56,003 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-12-03 16:13:56,003 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 48 [2018-12-03 16:13:56,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:56,004 INFO L225 Difference]: With dead ends: 53 [2018-12-03 16:13:56,004 INFO L226 Difference]: Without dead ends: 51 [2018-12-03 16:13:56,005 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1081 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=7341, Invalid=11841, Unknown=0, NotChecked=0, Total=19182 [2018-12-03 16:13:56,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-12-03 16:13:56,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-12-03 16:13:56,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 16:13:56,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-12-03 16:13:56,011 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2018-12-03 16:13:56,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:56,011 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-12-03 16:13:56,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-12-03 16:13:56,011 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-12-03 16:13:56,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 16:13:56,012 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:56,012 INFO L402 BasicCegarLoop]: trace histogram [47, 1, 1, 1] [2018-12-03 16:13:56,012 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:56,012 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:56,012 INFO L82 PathProgramCache]: Analyzing trace with hash -338555128, now seen corresponding path program 24 times [2018-12-03 16:13:56,013 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:56,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:56,013 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:13:56,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:56,014 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:56,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:57,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:57,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:57,329 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:57,329 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:13:57,329 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:13:57,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:57,330 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:13:57,337 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:13:57,338 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:13:57,445 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:13:57,445 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:13:57,503 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:57,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:57,580 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:14:01,100 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:01,119 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:14:01,119 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 98 [2018-12-03 16:14:01,119 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:14:01,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-12-03 16:14:01,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-12-03 16:14:01,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3488, Invalid=6214, Unknown=0, NotChecked=0, Total=9702 [2018-12-03 16:14:01,121 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 51 states. [2018-12-03 16:14:01,358 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 9 [2018-12-03 16:14:01,478 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 16:14:01,602 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 16:14:06,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:14:06,261 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-12-03 16:14:06,262 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 16:14:06,262 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 50 [2018-12-03 16:14:06,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:14:06,263 INFO L225 Difference]: With dead ends: 55 [2018-12-03 16:14:06,263 INFO L226 Difference]: Without dead ends: 53 [2018-12-03 16:14:06,264 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1224 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=8046, Invalid=13124, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 16:14:06,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-12-03 16:14:06,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-12-03 16:14:06,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-12-03 16:14:06,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-12-03 16:14:06,270 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2018-12-03 16:14:06,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:14:06,270 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-12-03 16:14:06,270 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-12-03 16:14:06,270 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-12-03 16:14:06,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-12-03 16:14:06,271 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:14:06,271 INFO L402 BasicCegarLoop]: trace histogram [49, 1, 1, 1] [2018-12-03 16:14:06,271 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:14:06,272 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:06,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1065973288, now seen corresponding path program 25 times [2018-12-03 16:14:06,272 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:14:06,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:06,273 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:14:06,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:06,273 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:14:06,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:07,658 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:07,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:07,658 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:14:07,658 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:14:07,659 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:14:07,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:07,659 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:14:07,667 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:14:07,667 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:14:07,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:07,852 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:14:08,020 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:08,021 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:14:11,694 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:11,713 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:14:11,713 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 102 [2018-12-03 16:14:11,713 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:14:11,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 16:14:11,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 16:14:11,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3783, Invalid=6723, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 16:14:11,715 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 53 states. [2018-12-03 16:14:11,849 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 8 [2018-12-03 16:14:11,970 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 9 [2018-12-03 16:14:12,093 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:14:12,345 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 16:14:12,869 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 11 [2018-12-03 16:14:13,020 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 11 [2018-12-03 16:14:13,181 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 11 [2018-12-03 16:14:13,341 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 125 DAG size of output: 11 [2018-12-03 16:14:17,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:14:17,389 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2018-12-03 16:14:17,389 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 16:14:17,389 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 52 [2018-12-03 16:14:17,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:14:17,390 INFO L225 Difference]: With dead ends: 57 [2018-12-03 16:14:17,390 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 16:14:17,392 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1325 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=8731, Invalid=14221, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 16:14:17,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 16:14:17,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-12-03 16:14:17,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-03 16:14:17,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-12-03 16:14:17,396 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2018-12-03 16:14:17,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:14:17,396 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-12-03 16:14:17,397 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 16:14:17,397 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-12-03 16:14:17,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 16:14:17,397 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:14:17,397 INFO L402 BasicCegarLoop]: trace histogram [51, 1, 1, 1] [2018-12-03 16:14:17,398 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:14:17,398 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:17,398 INFO L82 PathProgramCache]: Analyzing trace with hash -2096917176, now seen corresponding path program 26 times [2018-12-03 16:14:17,398 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:14:17,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:17,399 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:14:17,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:17,399 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:14:17,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:19,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:19,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:19,271 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:14:19,271 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:14:19,271 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:14:19,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:19,271 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:14:19,280 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:14:19,280 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:14:19,312 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-12-03 16:14:19,312 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:14:19,314 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:14:19,394 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:19,394 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:14:22,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:23,012 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:14:23,012 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-12-03 16:14:23,013 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:14:23,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 16:14:23,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 16:14:23,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4086, Invalid=7044, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 16:14:23,015 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 55 states. [2018-12-03 16:14:23,142 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 8 [2018-12-03 16:14:23,266 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 9 [2018-12-03 16:14:23,408 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:14:23,566 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:14:23,706 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:14:23,841 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:14:29,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:14:29,281 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2018-12-03 16:14:29,282 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 16:14:29,282 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 54 [2018-12-03 16:14:29,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:14:29,283 INFO L225 Difference]: With dead ends: 59 [2018-12-03 16:14:29,283 INFO L226 Difference]: Without dead ends: 57 [2018-12-03 16:14:29,284 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1378 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=9390, Invalid=15102, Unknown=0, NotChecked=0, Total=24492 [2018-12-03 16:14:29,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-12-03 16:14:29,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-12-03 16:14:29,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-03 16:14:29,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-12-03 16:14:29,287 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2018-12-03 16:14:29,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:14:29,288 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-12-03 16:14:29,288 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 16:14:29,288 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-12-03 16:14:29,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-12-03 16:14:29,288 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:14:29,288 INFO L402 BasicCegarLoop]: trace histogram [53, 1, 1, 1] [2018-12-03 16:14:29,288 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:14:29,289 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:29,289 INFO L82 PathProgramCache]: Analyzing trace with hash -797807512, now seen corresponding path program 27 times [2018-12-03 16:14:29,289 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:14:29,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:29,290 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:14:29,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:29,290 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:14:29,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:31,014 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:31,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:31,014 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:14:31,014 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:14:31,015 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:14:31,015 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:31,015 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:14:31,023 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:14:31,023 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:14:31,169 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:14:31,169 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:14:31,250 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:14:31,437 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:31,438 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:14:35,918 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:35,937 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:14:35,937 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 110 [2018-12-03 16:14:35,937 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:14:35,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-12-03 16:14:35,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-12-03 16:14:35,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4409, Invalid=7801, Unknown=0, NotChecked=0, Total=12210 [2018-12-03 16:14:35,938 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 57 states. [2018-12-03 16:14:36,083 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-12-03 16:14:36,219 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-12-03 16:14:36,361 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:14:36,503 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:14:36,646 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:14:36,785 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:14:36,921 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:14:37,065 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:14:40,319 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 11 [2018-12-03 16:14:42,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:14:42,742 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-12-03 16:14:42,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 16:14:42,743 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 56 [2018-12-03 16:14:42,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:14:42,743 INFO L225 Difference]: With dead ends: 61 [2018-12-03 16:14:42,744 INFO L226 Difference]: Without dead ends: 59 [2018-12-03 16:14:42,745 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1539 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=10185, Invalid=16547, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 16:14:42,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-12-03 16:14:42,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-12-03 16:14:42,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-12-03 16:14:42,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-12-03 16:14:42,751 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2018-12-03 16:14:42,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:14:42,752 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-12-03 16:14:42,752 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-12-03 16:14:42,752 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-12-03 16:14:42,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-12-03 16:14:42,752 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:14:42,753 INFO L402 BasicCegarLoop]: trace histogram [55, 1, 1, 1] [2018-12-03 16:14:42,753 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:14:42,753 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:42,753 INFO L82 PathProgramCache]: Analyzing trace with hash 2106063752, now seen corresponding path program 28 times [2018-12-03 16:14:42,754 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:14:42,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:42,754 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:14:42,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:42,755 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:14:42,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:44,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:44,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:44,598 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:14:44,599 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:14:44,599 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:14:44,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:44,599 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:14:44,609 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:14:44,609 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:14:44,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:44,856 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:14:44,952 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:44,952 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:14:49,658 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:49,676 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:14:49,677 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 114 [2018-12-03 16:14:49,677 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:14:49,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 16:14:49,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 16:14:49,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4740, Invalid=8370, Unknown=0, NotChecked=0, Total=13110 [2018-12-03 16:14:49,678 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 59 states. [2018-12-03 16:14:49,826 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-12-03 16:14:49,971 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 9 [2018-12-03 16:14:50,141 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:14:50,287 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:14:50,434 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:14:50,577 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:14:50,723 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:14:50,871 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:14:51,025 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:14:51,181 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:14:51,658 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 16:14:57,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:14:57,117 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-12-03 16:14:57,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 16:14:57,118 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 58 [2018-12-03 16:14:57,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:14:57,119 INFO L225 Difference]: With dead ends: 63 [2018-12-03 16:14:57,119 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 16:14:57,121 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1652 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=10954, Invalid=17776, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 16:14:57,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 16:14:57,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-12-03 16:14:57,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-12-03 16:14:57,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-12-03 16:14:57,127 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2018-12-03 16:14:57,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:14:57,127 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-12-03 16:14:57,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 16:14:57,127 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-12-03 16:14:57,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-12-03 16:14:57,127 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:14:57,127 INFO L402 BasicCegarLoop]: trace histogram [57, 1, 1, 1] [2018-12-03 16:14:57,128 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:14:57,128 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:57,128 INFO L82 PathProgramCache]: Analyzing trace with hash 997606056, now seen corresponding path program 29 times [2018-12-03 16:14:57,128 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:14:57,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:57,129 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:14:57,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:57,129 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:14:57,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:58,938 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:58,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:58,938 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:14:58,938 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:14:58,939 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:14:58,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:58,939 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:14:58,947 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:14:58,947 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:14:58,997 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-03 16:14:58,997 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:14:58,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:14:59,085 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:59,085 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:15:03,850 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:03,870 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:15:03,870 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 117 [2018-12-03 16:15:03,870 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:15:03,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-12-03 16:15:03,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-12-03 16:15:03,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5079, Invalid=8727, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 16:15:03,872 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 61 states. [2018-12-03 16:15:04,025 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 8 [2018-12-03 16:15:04,170 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 9 [2018-12-03 16:15:04,333 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:15:04,502 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:15:04,681 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:15:04,833 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:15:04,983 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:15:05,133 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:15:05,295 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:15:05,451 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:15:05,604 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:15:12,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:15:12,091 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2018-12-03 16:15:12,091 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-12-03 16:15:12,091 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 60 [2018-12-03 16:15:12,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:15:12,092 INFO L225 Difference]: With dead ends: 65 [2018-12-03 16:15:12,092 INFO L226 Difference]: Without dead ends: 63 [2018-12-03 16:15:12,095 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1711 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=11691, Invalid=18759, Unknown=0, NotChecked=0, Total=30450 [2018-12-03 16:15:12,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-12-03 16:15:12,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-12-03 16:15:12,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 16:15:12,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-12-03 16:15:12,100 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2018-12-03 16:15:12,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:15:12,100 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-12-03 16:15:12,100 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-12-03 16:15:12,100 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-12-03 16:15:12,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 16:15:12,101 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:15:12,101 INFO L402 BasicCegarLoop]: trace histogram [59, 1, 1, 1] [2018-12-03 16:15:12,101 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:15:12,101 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:15:12,101 INFO L82 PathProgramCache]: Analyzing trace with hash 921649608, now seen corresponding path program 30 times [2018-12-03 16:15:12,102 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:15:12,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:12,102 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:15:12,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:12,103 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:15:12,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:14,041 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:14,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:14,041 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:15:14,041 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:15:14,041 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:15:14,042 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:14,042 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:15:14,064 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:15:14,065 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:15:14,257 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:15:14,257 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:15:14,366 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:15:14,503 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:14,503 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:15:19,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:19,940 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:15:19,940 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 122 [2018-12-03 16:15:19,940 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:15:19,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 16:15:19,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 16:15:19,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5438, Invalid=9568, Unknown=0, NotChecked=0, Total=15006 [2018-12-03 16:15:19,942 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 63 states. [2018-12-03 16:15:20,154 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-12-03 16:15:20,310 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-12-03 16:15:20,469 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:15:20,630 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:15:20,796 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:15:20,955 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:15:21,124 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:15:21,286 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:15:21,458 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:15:21,625 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:15:21,795 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:15:21,958 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:15:22,126 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:15:22,467 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 16:15:23,162 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 11 [2018-12-03 16:15:28,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:15:28,669 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-12-03 16:15:28,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 16:15:28,670 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 62 [2018-12-03 16:15:28,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:15:28,670 INFO L225 Difference]: With dead ends: 67 [2018-12-03 16:15:28,671 INFO L226 Difference]: Without dead ends: 65 [2018-12-03 16:15:28,672 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1890 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=12576, Invalid=20366, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 16:15:28,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-12-03 16:15:28,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2018-12-03 16:15:28,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-12-03 16:15:28,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-12-03 16:15:28,677 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2018-12-03 16:15:28,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:15:28,677 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-12-03 16:15:28,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 16:15:28,678 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-12-03 16:15:28,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-12-03 16:15:28,678 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:15:28,678 INFO L402 BasicCegarLoop]: trace histogram [61, 1, 1, 1] [2018-12-03 16:15:28,678 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:15:28,679 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:15:28,679 INFO L82 PathProgramCache]: Analyzing trace with hash 941947112, now seen corresponding path program 31 times [2018-12-03 16:15:28,679 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:15:28,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:28,680 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:15:28,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:28,680 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:15:28,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:30,934 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:30,934 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:30,934 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:15:30,934 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:15:30,935 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:15:30,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:30,935 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:15:30,945 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:15:30,945 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:15:31,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:31,274 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:15:31,388 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:31,388 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:15:36,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:36,931 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:15:36,931 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 126 [2018-12-03 16:15:36,931 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:15:36,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 16:15:36,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 16:15:36,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5805, Invalid=10197, Unknown=0, NotChecked=0, Total=16002 [2018-12-03 16:15:36,933 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 65 states. [2018-12-03 16:15:37,114 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-12-03 16:15:37,278 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 9 [2018-12-03 16:15:37,443 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:15:37,610 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:15:37,781 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:15:37,949 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:15:38,117 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:15:38,285 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:15:38,460 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:15:38,637 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:15:38,812 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:15:38,988 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:15:39,162 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:15:39,335 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:15:39,520 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:15:39,700 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:15:40,257 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 16:15:40,462 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-12-03 16:15:46,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:15:46,466 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-12-03 16:15:46,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 16:15:46,467 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 64 [2018-12-03 16:15:46,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:15:46,467 INFO L225 Difference]: With dead ends: 69 [2018-12-03 16:15:46,468 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 16:15:46,470 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2015 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=13429, Invalid=21727, Unknown=0, NotChecked=0, Total=35156 [2018-12-03 16:15:46,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 16:15:46,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-12-03 16:15:46,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-12-03 16:15:46,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2018-12-03 16:15:46,476 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2018-12-03 16:15:46,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:15:46,476 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2018-12-03 16:15:46,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 16:15:46,477 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2018-12-03 16:15:46,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-12-03 16:15:46,477 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:15:46,477 INFO L402 BasicCegarLoop]: trace histogram [63, 1, 1, 1] [2018-12-03 16:15:46,477 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:15:46,478 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:15:46,478 INFO L82 PathProgramCache]: Analyzing trace with hash -1026988024, now seen corresponding path program 32 times [2018-12-03 16:15:46,478 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:15:46,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:46,479 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:15:46,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:46,479 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:15:46,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:48,607 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:48,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:48,608 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:15:48,608 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:15:48,608 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:15:48,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:48,608 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:15:48,617 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:15:48,617 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:15:48,673 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-12-03 16:15:48,673 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:15:48,676 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:15:48,784 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:48,785 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:15:54,462 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:54,481 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:15:54,482 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 129 [2018-12-03 16:15:54,482 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:15:54,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-12-03 16:15:54,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-12-03 16:15:54,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6180, Invalid=10590, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 16:15:54,484 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 67 states. [2018-12-03 16:15:54,659 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 8 [2018-12-03 16:15:54,836 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 9 [2018-12-03 16:15:55,012 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:15:55,188 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:15:55,362 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:15:55,551 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:15:55,761 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:15:55,955 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:15:56,141 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:15:56,323 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:15:56,510 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:15:56,696 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:15:56,874 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:15:57,052 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:15:57,245 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:15:57,428 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:15:57,799 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:15:57,991 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 16:15:58,185 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 16:16:04,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:16:04,685 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2018-12-03 16:16:04,685 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 16:16:04,685 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 66 [2018-12-03 16:16:04,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:16:04,686 INFO L225 Difference]: With dead ends: 71 [2018-12-03 16:16:04,686 INFO L226 Difference]: Without dead ends: 69 [2018-12-03 16:16:04,689 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2080 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=14244, Invalid=22812, Unknown=0, NotChecked=0, Total=37056 [2018-12-03 16:16:04,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-12-03 16:16:04,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-12-03 16:16:04,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-03 16:16:04,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-12-03 16:16:04,694 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2018-12-03 16:16:04,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:16:04,695 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-12-03 16:16:04,695 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-12-03 16:16:04,695 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-12-03 16:16:04,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-12-03 16:16:04,695 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:16:04,696 INFO L402 BasicCegarLoop]: trace histogram [65, 1, 1, 1] [2018-12-03 16:16:04,696 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:16:04,696 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:16:04,696 INFO L82 PathProgramCache]: Analyzing trace with hash 906923816, now seen corresponding path program 33 times [2018-12-03 16:16:04,696 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:16:04,697 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:04,697 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:16:04,697 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:04,697 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:16:04,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:16:07,258 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:16:07,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:07,258 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:16:07,258 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:16:07,258 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:16:07,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:07,259 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:16:07,268 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:16:07,268 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:16:07,527 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:16:07,527 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:16:07,673 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:16:07,783 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:16:07,783 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:16:14,126 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:16:14,145 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:16:14,146 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 134 [2018-12-03 16:16:14,146 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:16:14,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-12-03 16:16:14,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-12-03 16:16:14,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6575, Invalid=11515, Unknown=0, NotChecked=0, Total=18090 [2018-12-03 16:16:14,147 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 69 states. [2018-12-03 16:16:14,351 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-12-03 16:16:14,542 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-12-03 16:16:14,739 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:16:14,933 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:16:15,131 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:16:15,331 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:16:15,528 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:16:15,718 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:16:15,915 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:16:16,131 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:16:16,348 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:16:16,547 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:16:16,745 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:16:16,937 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:16:17,142 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:16:17,340 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:16:17,539 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:16:17,758 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:16:17,955 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:16:18,159 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:16:25,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:16:25,411 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-12-03 16:16:25,411 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 16:16:25,411 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 68 [2018-12-03 16:16:25,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:16:25,412 INFO L225 Difference]: With dead ends: 73 [2018-12-03 16:16:25,412 INFO L226 Difference]: Without dead ends: 71 [2018-12-03 16:16:25,414 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2277 ImplicationChecksByTransitivity, 19.6s TimeCoverageRelationStatistics Valid=15219, Invalid=24581, Unknown=0, NotChecked=0, Total=39800 [2018-12-03 16:16:25,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-12-03 16:16:25,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2018-12-03 16:16:25,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-12-03 16:16:25,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-12-03 16:16:25,418 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2018-12-03 16:16:25,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:16:25,418 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-12-03 16:16:25,418 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-12-03 16:16:25,418 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-12-03 16:16:25,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-12-03 16:16:25,419 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:16:25,419 INFO L402 BasicCegarLoop]: trace histogram [67, 1, 1, 1] [2018-12-03 16:16:25,419 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:16:25,419 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:16:25,420 INFO L82 PathProgramCache]: Analyzing trace with hash -324637112, now seen corresponding path program 34 times [2018-12-03 16:16:25,420 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:16:25,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:25,420 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:16:25,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:25,421 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:16:25,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:16:29,104 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:16:29,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:29,105 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:16:29,105 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:16:29,105 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:16:29,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:29,105 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:16:29,115 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:16:29,116 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:16:29,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:16:29,537 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:16:29,639 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:16:29,639 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:16:36,532 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:16:36,553 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:16:36,553 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 138 [2018-12-03 16:16:36,553 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:16:36,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 16:16:36,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 16:16:36,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6978, Invalid=12204, Unknown=0, NotChecked=0, Total=19182 [2018-12-03 16:16:36,555 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 71 states. [2018-12-03 16:16:36,824 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-12-03 16:16:37,016 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 9 [2018-12-03 16:16:37,211 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:16:37,409 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:16:37,607 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:16:37,800 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:16:37,990 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:16:38,190 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:16:38,398 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:16:38,607 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:16:38,807 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:16:39,013 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:16:39,219 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:16:39,416 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:16:39,621 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:16:39,824 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:16:40,033 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:16:40,243 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:16:40,445 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:16:40,649 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:16:40,855 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:16:41,066 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:16:41,685 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 16:16:41,921 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-12-03 16:16:48,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:16:48,567 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2018-12-03 16:16:48,567 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 16:16:48,567 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 70 [2018-12-03 16:16:48,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:16:48,568 INFO L225 Difference]: With dead ends: 75 [2018-12-03 16:16:48,568 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 16:16:48,571 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2414 ImplicationChecksByTransitivity, 22.0s TimeCoverageRelationStatistics Valid=16156, Invalid=26074, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 16:16:48,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 16:16:48,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2018-12-03 16:16:48,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 16:16:48,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2018-12-03 16:16:48,577 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2018-12-03 16:16:48,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:16:48,578 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2018-12-03 16:16:48,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 16:16:48,578 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2018-12-03 16:16:48,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 16:16:48,579 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:16:48,579 INFO L402 BasicCegarLoop]: trace histogram [69, 1, 1, 1] [2018-12-03 16:16:48,579 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:16:48,579 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:16:48,579 INFO L82 PathProgramCache]: Analyzing trace with hash 1556284776, now seen corresponding path program 35 times [2018-12-03 16:16:48,580 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:16:48,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:48,580 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:16:48,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:48,581 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:16:48,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:16:51,182 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:16:51,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:51,183 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:16:51,183 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:16:51,183 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:16:51,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:51,183 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:16:51,192 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:16:51,193 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:16:51,248 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-12-03 16:16:51,248 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:16:51,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:16:51,357 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:16:51,357 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:16:58,405 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:16:58,424 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:16:58,424 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 141 [2018-12-03 16:16:58,424 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:16:58,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-12-03 16:16:58,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-12-03 16:16:58,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7389, Invalid=12633, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 16:16:58,425 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 73 states. [2018-12-03 16:16:58,624 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 8 [2018-12-03 16:16:58,819 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 9 [2018-12-03 16:16:59,019 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:16:59,219 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:16:59,429 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:16:59,627 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:16:59,832 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:17:00,037 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:17:00,247 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:17:00,462 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:17:00,676 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:17:00,893 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:17:01,095 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:17:01,301 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:17:01,511 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:17:01,731 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:17:01,947 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:17:02,178 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:17:02,403 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:17:02,619 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:17:02,840 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:17:03,055 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:17:03,277 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:17:03,491 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:17:03,912 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 16:17:11,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:17:11,157 INFO L93 Difference]: Finished difference Result 77 states and 78 transitions. [2018-12-03 16:17:11,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 16:17:11,157 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 72 [2018-12-03 16:17:11,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:17:11,158 INFO L225 Difference]: With dead ends: 77 [2018-12-03 16:17:11,158 INFO L226 Difference]: Without dead ends: 75 [2018-12-03 16:17:11,159 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2485 ImplicationChecksByTransitivity, 21.8s TimeCoverageRelationStatistics Valid=17049, Invalid=27261, Unknown=0, NotChecked=0, Total=44310 [2018-12-03 16:17:11,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-03 16:17:11,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-12-03 16:17:11,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-03 16:17:11,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-12-03 16:17:11,165 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2018-12-03 16:17:11,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:17:11,165 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-12-03 16:17:11,165 INFO L481 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-12-03 16:17:11,166 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-12-03 16:17:11,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-12-03 16:17:11,166 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:17:11,166 INFO L402 BasicCegarLoop]: trace histogram [71, 1, 1, 1] [2018-12-03 16:17:11,166 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:17:11,166 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:17:11,166 INFO L82 PathProgramCache]: Analyzing trace with hash 940987528, now seen corresponding path program 36 times [2018-12-03 16:17:11,167 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:17:11,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:17:11,167 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:17:11,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:17:11,167 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:17:11,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:17:14,478 INFO L134 CoverageAnalysis]: Checked inductivity of 2556 backedges. 0 proven. 2556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:17:14,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:17:14,478 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:17:14,478 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:17:14,478 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:17:14,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:17:14,478 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:17:14,488 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:17:14,488 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:17:14,811 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:17:14,811 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:17:14,995 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:17:15,152 INFO L134 CoverageAnalysis]: Checked inductivity of 2556 backedges. 0 proven. 2556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:17:15,152 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:17:22,495 INFO L134 CoverageAnalysis]: Checked inductivity of 2556 backedges. 0 proven. 2556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:17:22,514 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:17:22,515 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 146 [2018-12-03 16:17:22,515 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:17:22,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-03 16:17:22,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-03 16:17:22,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7820, Invalid=13642, Unknown=0, NotChecked=0, Total=21462 [2018-12-03 16:17:22,516 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 75 states. [2018-12-03 16:17:22,808 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-12-03 16:17:23,011 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-12-03 16:17:23,221 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:17:23,430 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:17:23,641 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:17:23,853 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:17:24,061 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:17:24,272 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:17:24,496 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:17:24,714 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:17:24,950 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:17:25,161 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:17:25,378 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:17:25,593 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:17:25,822 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:17:26,045 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:17:26,258 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:17:26,492 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:17:26,721 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:17:26,946 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:17:27,179 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:17:27,405 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:17:27,629 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:17:27,879 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:17:28,136 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:17:28,355 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:17:36,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:17:36,509 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-12-03 16:17:36,509 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 16:17:36,510 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 74 [2018-12-03 16:17:36,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:17:36,510 INFO L225 Difference]: With dead ends: 79 [2018-12-03 16:17:36,510 INFO L226 Difference]: Without dead ends: 77 [2018-12-03 16:17:36,512 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2700 ImplicationChecksByTransitivity, 23.8s TimeCoverageRelationStatistics Valid=18114, Invalid=29192, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 16:17:36,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-12-03 16:17:36,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-12-03 16:17:36,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-12-03 16:17:36,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-12-03 16:17:36,518 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2018-12-03 16:17:36,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:17:36,518 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-12-03 16:17:36,519 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-03 16:17:36,519 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-12-03 16:17:36,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-12-03 16:17:36,519 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:17:36,519 INFO L402 BasicCegarLoop]: trace histogram [73, 1, 1, 1] [2018-12-03 16:17:36,520 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:17:36,520 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:17:36,520 INFO L82 PathProgramCache]: Analyzing trace with hash -1949148248, now seen corresponding path program 37 times [2018-12-03 16:17:36,520 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:17:36,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:17:36,523 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:17:36,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:17:36,523 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:17:36,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:17:39,648 INFO L134 CoverageAnalysis]: Checked inductivity of 2701 backedges. 0 proven. 2701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:17:39,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:17:39,648 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:17:39,649 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:17:39,649 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:17:39,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:17:39,649 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:17:39,666 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:17:39,667 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:17:40,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:17:40,219 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:17:40,327 INFO L134 CoverageAnalysis]: Checked inductivity of 2701 backedges. 0 proven. 2701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:17:40,327 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:17:47,965 INFO L134 CoverageAnalysis]: Checked inductivity of 2701 backedges. 0 proven. 2701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:17:47,984 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:17:47,984 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 150 [2018-12-03 16:17:47,984 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:17:47,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 16:17:47,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 16:17:47,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8259, Invalid=14391, Unknown=0, NotChecked=0, Total=22650 [2018-12-03 16:17:47,986 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 77 states. [2018-12-03 16:17:48,226 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2018-12-03 16:17:48,453 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 9 [2018-12-03 16:17:48,679 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:17:48,904 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:17:49,131 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:17:49,352 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:17:49,575 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:17:49,811 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:17:50,041 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:17:50,277 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:17:50,504 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:17:50,738 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:17:50,966 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:17:51,183 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:17:51,428 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:17:51,666 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:17:51,900 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:17:52,136 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:17:52,368 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:17:52,612 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:17:52,853 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:17:53,087 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:17:53,323 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:17:53,578 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:17:53,827 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:17:54,068 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:17:54,307 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:17:54,544 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:18:02,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:18:02,708 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2018-12-03 16:18:02,709 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 16:18:02,709 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 76 [2018-12-03 16:18:02,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:18:02,710 INFO L225 Difference]: With dead ends: 81 [2018-12-03 16:18:02,710 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 16:18:02,713 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2849 ImplicationChecksByTransitivity, 24.8s TimeCoverageRelationStatistics Valid=19135, Invalid=30817, Unknown=0, NotChecked=0, Total=49952 [2018-12-03 16:18:02,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 16:18:02,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-12-03 16:18:02,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-12-03 16:18:02,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-12-03 16:18:02,721 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2018-12-03 16:18:02,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:18:02,721 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-12-03 16:18:02,721 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 16:18:02,721 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-12-03 16:18:02,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-12-03 16:18:02,722 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:18:02,722 INFO L402 BasicCegarLoop]: trace histogram [75, 1, 1, 1] [2018-12-03 16:18:02,722 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:18:02,722 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:18:02,722 INFO L82 PathProgramCache]: Analyzing trace with hash -525788472, now seen corresponding path program 38 times [2018-12-03 16:18:02,723 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:18:02,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:18:02,723 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:18:02,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:18:02,724 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:18:03,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:18:06,348 INFO L134 CoverageAnalysis]: Checked inductivity of 2850 backedges. 0 proven. 2850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:18:06,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:18:06,349 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:18:06,349 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:18:06,349 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:18:06,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:18:06,350 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:18:06,367 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:18:06,367 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:18:06,479 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-12-03 16:18:06,480 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:18:06,483 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:18:06,613 INFO L134 CoverageAnalysis]: Checked inductivity of 2850 backedges. 0 proven. 2850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:18:06,613 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:18:14,625 INFO L134 CoverageAnalysis]: Checked inductivity of 2850 backedges. 0 proven. 2850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:18:14,644 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:18:14,644 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 153 [2018-12-03 16:18:14,644 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:18:14,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-12-03 16:18:14,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-12-03 16:18:14,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8706, Invalid=14856, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 16:18:14,646 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 79 states. [2018-12-03 16:18:14,885 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 8 [2018-12-03 16:18:15,119 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 9 [2018-12-03 16:18:15,348 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:18:15,593 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:18:15,828 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:18:16,057 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:18:16,289 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:18:16,519 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:18:16,765 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:18:17,002 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:18:17,244 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:18:17,484 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:18:17,725 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:18:17,952 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:18:18,214 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:18:18,460 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:18:18,706 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:18:18,958 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:18:19,217 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:18:19,483 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:18:19,733 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:18:19,979 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:18:20,223 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:18:20,474 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:18:20,730 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:18:20,976 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:18:21,223 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:18:21,465 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:18:21,711 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:18:30,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:18:30,468 INFO L93 Difference]: Finished difference Result 83 states and 84 transitions. [2018-12-03 16:18:30,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-12-03 16:18:30,468 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 78 [2018-12-03 16:18:30,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:18:30,469 INFO L225 Difference]: With dead ends: 83 [2018-12-03 16:18:30,469 INFO L226 Difference]: Without dead ends: 81 [2018-12-03 16:18:30,471 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2926 ImplicationChecksByTransitivity, 26.7s TimeCoverageRelationStatistics Valid=20106, Invalid=32106, Unknown=0, NotChecked=0, Total=52212 [2018-12-03 16:18:30,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-12-03 16:18:30,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-12-03 16:18:30,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-03 16:18:30,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-12-03 16:18:30,476 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2018-12-03 16:18:30,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:18:30,476 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-12-03 16:18:30,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has 79 states. [2018-12-03 16:18:30,476 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-12-03 16:18:30,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-12-03 16:18:30,477 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:18:30,477 INFO L402 BasicCegarLoop]: trace histogram [77, 1, 1, 1] [2018-12-03 16:18:30,477 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:18:30,477 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:18:30,477 INFO L82 PathProgramCache]: Analyzing trace with hash 1523356136, now seen corresponding path program 39 times [2018-12-03 16:18:30,477 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:18:30,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:18:30,478 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:18:30,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:18:30,478 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:18:31,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:18:33,914 INFO L134 CoverageAnalysis]: Checked inductivity of 3003 backedges. 0 proven. 3003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:18:33,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:18:33,915 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:18:33,915 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:18:33,915 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:18:33,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:18:33,915 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:18:33,925 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:18:33,925 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:18:34,346 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:18:34,347 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:18:34,579 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:18:34,695 INFO L134 CoverageAnalysis]: Checked inductivity of 3003 backedges. 0 proven. 3003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:18:34,695 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:18:43,275 INFO L134 CoverageAnalysis]: Checked inductivity of 3003 backedges. 0 proven. 3003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:18:43,293 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:18:43,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 158 [2018-12-03 16:18:43,293 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:18:43,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-12-03 16:18:43,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-12-03 16:18:43,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9173, Invalid=15949, Unknown=0, NotChecked=0, Total=25122 [2018-12-03 16:18:43,295 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 81 states. [2018-12-03 16:18:43,543 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 8 [2018-12-03 16:18:43,782 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 9 [2018-12-03 16:18:44,021 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:18:44,258 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:18:44,512 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:18:44,792 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:18:45,028 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:18:45,271 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:18:45,523 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:18:45,776 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:18:46,026 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:18:46,284 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:18:46,540 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:18:46,781 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:18:47,041 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:18:47,287 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:18:47,541 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:18:47,813 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:18:48,071 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:18:48,332 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:18:48,598 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:18:48,855 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:18:49,120 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:18:49,372 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:18:49,639 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:18:49,918 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:18:50,185 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:18:50,443 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:18:50,699 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:18:50,948 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:18:51,202 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:18:51,459 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:19:00,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:19:00,152 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2018-12-03 16:19:00,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 16:19:00,153 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 80 [2018-12-03 16:19:00,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:19:00,153 INFO L225 Difference]: With dead ends: 85 [2018-12-03 16:19:00,153 INFO L226 Difference]: Without dead ends: 83 [2018-12-03 16:19:00,155 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3159 ImplicationChecksByTransitivity, 27.8s TimeCoverageRelationStatistics Valid=21261, Invalid=34199, Unknown=0, NotChecked=0, Total=55460 [2018-12-03 16:19:00,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-12-03 16:19:00,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2018-12-03 16:19:00,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-12-03 16:19:00,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-12-03 16:19:00,160 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2018-12-03 16:19:00,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:19:00,160 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-12-03 16:19:00,160 INFO L481 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-12-03 16:19:00,160 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-12-03 16:19:00,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-12-03 16:19:00,161 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:19:00,161 INFO L402 BasicCegarLoop]: trace histogram [79, 1, 1, 1] [2018-12-03 16:19:00,161 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:19:00,161 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:19:00,161 INFO L82 PathProgramCache]: Analyzing trace with hash -638664440, now seen corresponding path program 40 times [2018-12-03 16:19:00,161 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:19:00,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:19:00,162 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:19:00,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:19:00,162 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:19:00,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:19:03,826 INFO L134 CoverageAnalysis]: Checked inductivity of 3160 backedges. 0 proven. 3160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:19:03,826 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:19:03,826 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:19:03,826 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:19:03,827 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:19:03,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:19:03,827 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:19:03,835 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:19:03,835 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:19:04,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:19:04,502 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:19:04,612 INFO L134 CoverageAnalysis]: Checked inductivity of 3160 backedges. 0 proven. 3160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:19:04,613 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:19:13,764 INFO L134 CoverageAnalysis]: Checked inductivity of 3160 backedges. 0 proven. 3160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:19:13,782 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:19:13,783 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 162 [2018-12-03 16:19:13,783 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:19:13,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 16:19:13,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 16:19:13,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9648, Invalid=16758, Unknown=0, NotChecked=0, Total=26406 [2018-12-03 16:19:13,785 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 83 states. [2018-12-03 16:19:14,058 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 8 [2018-12-03 16:19:14,300 WARN L180 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 9 [2018-12-03 16:19:14,542 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:19:14,796 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:19:15,048 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:19:15,308 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:19:15,577 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:19:15,826 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:19:16,083 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:19:16,340 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:19:16,610 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:19:16,874 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:19:17,123 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:19:17,375 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:19:17,645 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:19:17,903 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:19:18,171 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:19:18,446 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:19:18,709 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:19:18,977 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:19:19,255 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:19:19,542 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:19:19,832 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:19:20,099 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:19:20,380 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:19:20,673 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:19:20,950 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:19:21,221 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:19:21,485 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:19:21,750 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:19:22,015 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:19:22,279 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:19:22,544 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:19:22,806 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:19:23,075 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 16:19:31,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:19:31,764 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2018-12-03 16:19:31,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 16:19:31,765 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 82 [2018-12-03 16:19:31,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:19:31,766 INFO L225 Difference]: With dead ends: 87 [2018-12-03 16:19:31,766 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 16:19:31,768 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3320 ImplicationChecksByTransitivity, 30.0s TimeCoverageRelationStatistics Valid=22366, Invalid=35956, Unknown=0, NotChecked=0, Total=58322 [2018-12-03 16:19:31,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 16:19:31,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2018-12-03 16:19:31,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-12-03 16:19:31,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2018-12-03 16:19:31,775 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2018-12-03 16:19:31,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:19:31,775 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2018-12-03 16:19:31,776 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 16:19:31,776 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2018-12-03 16:19:31,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-12-03 16:19:31,776 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:19:31,776 INFO L402 BasicCegarLoop]: trace histogram [81, 1, 1, 1] [2018-12-03 16:19:31,777 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:19:31,777 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:19:31,777 INFO L82 PathProgramCache]: Analyzing trace with hash 423733288, now seen corresponding path program 41 times [2018-12-03 16:19:31,777 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:19:31,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:19:31,778 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:19:31,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:19:31,778 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:19:32,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:19:35,340 INFO L134 CoverageAnalysis]: Checked inductivity of 3321 backedges. 0 proven. 3321 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:19:35,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:19:35,341 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:19:35,341 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:19:35,341 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:19:35,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:19:35,341 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:19:35,350 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:19:35,350 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:19:35,412 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-12-03 16:19:35,412 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:19:35,416 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:19:35,547 INFO L134 CoverageAnalysis]: Checked inductivity of 3321 backedges. 0 proven. 3321 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:19:35,548 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:19:45,097 INFO L134 CoverageAnalysis]: Checked inductivity of 3321 backedges. 0 proven. 3321 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:19:45,116 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:19:45,116 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 165 [2018-12-03 16:19:45,116 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:19:45,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-12-03 16:19:45,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-12-03 16:19:45,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10131, Invalid=17259, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 16:19:45,118 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 85 states. [2018-12-03 16:19:45,391 WARN L180 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 8 [2018-12-03 16:19:45,645 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 9 [2018-12-03 16:19:45,911 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:19:46,183 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:19:46,448 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:19:46,721 WARN L180 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:19:46,979 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:19:47,243 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:19:47,500 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:19:47,773 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:19:48,044 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:19:48,316 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:19:48,573 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:19:48,843 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:19:49,125 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:19:49,402 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:19:49,681 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:19:49,962 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:19:50,239 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:19:50,518 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:19:50,810 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:19:51,100 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:19:51,419 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:19:51,703 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:19:51,991 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:19:52,281 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:19:52,567 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:19:52,857 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:19:53,131 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:19:53,412 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:19:53,687 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:19:53,958 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:19:54,239 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:19:54,510 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:19:54,773 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:20:04,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:20:04,347 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2018-12-03 16:20:04,348 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-12-03 16:20:04,348 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 84 [2018-12-03 16:20:04,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:20:04,349 INFO L225 Difference]: With dead ends: 89 [2018-12-03 16:20:04,349 INFO L226 Difference]: Without dead ends: 87 [2018-12-03 16:20:04,351 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3403 ImplicationChecksByTransitivity, 31.4s TimeCoverageRelationStatistics Valid=23415, Invalid=37347, Unknown=0, NotChecked=0, Total=60762 [2018-12-03 16:20:04,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-12-03 16:20:04,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-12-03 16:20:04,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 16:20:04,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-12-03 16:20:04,358 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2018-12-03 16:20:04,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:20:04,358 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-12-03 16:20:04,359 INFO L481 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-12-03 16:20:04,359 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-12-03 16:20:04,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 16:20:04,359 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:20:04,359 INFO L402 BasicCegarLoop]: trace histogram [83, 1, 1, 1] [2018-12-03 16:20:04,360 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:20:04,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:20:04,360 INFO L82 PathProgramCache]: Analyzing trace with hash -814266552, now seen corresponding path program 42 times [2018-12-03 16:20:04,360 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:20:04,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:20:04,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:20:04,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:20:04,361 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:20:04,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:20:08,836 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 0 proven. 3486 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:20:08,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:20:08,837 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:20:08,837 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:20:08,837 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:20:08,837 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:20:08,837 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:20:08,855 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:20:08,856 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:20:09,361 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:20:09,361 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:20:09,651 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:20:09,773 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 0 proven. 3486 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:20:09,774 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:20:20,074 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 0 proven. 3486 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:20:20,094 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:20:20,094 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 170 [2018-12-03 16:20:20,094 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:20:20,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-12-03 16:20:20,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-12-03 16:20:20,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10634, Invalid=18436, Unknown=0, NotChecked=0, Total=29070 [2018-12-03 16:20:20,096 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 87 states. [2018-12-03 16:20:20,374 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 8 [2018-12-03 16:20:20,636 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 9 [2018-12-03 16:20:20,909 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:20:21,192 WARN L180 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:20:21,476 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:20:21,750 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:20:22,038 WARN L180 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:20:22,316 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:20:22,600 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:20:22,884 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:20:23,164 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:20:23,464 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:20:23,735 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:20:24,012 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:20:24,308 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:20:24,596 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:20:24,887 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:20:25,179 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:20:25,468 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:20:25,756 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:20:26,063 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:20:26,358 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:20:26,658 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:20:26,966 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:20:27,276 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:20:27,587 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:20:27,882 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:20:28,175 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:20:28,466 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:20:28,755 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:20:29,067 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:20:29,350 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:20:29,623 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:20:29,908 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:20:30,190 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:20:30,472 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:20:30,748 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:20:31,029 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:20:32,109 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-12-03 16:20:40,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:20:40,361 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2018-12-03 16:20:40,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 16:20:40,361 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 86 [2018-12-03 16:20:40,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:20:40,362 INFO L225 Difference]: With dead ends: 91 [2018-12-03 16:20:40,362 INFO L226 Difference]: Without dead ends: 89 [2018-12-03 16:20:40,363 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3654 ImplicationChecksByTransitivity, 34.0s TimeCoverageRelationStatistics Valid=24660, Invalid=39602, Unknown=0, NotChecked=0, Total=64262 [2018-12-03 16:20:40,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-12-03 16:20:40,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-12-03 16:20:40,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-12-03 16:20:40,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-12-03 16:20:40,369 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2018-12-03 16:20:40,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:20:40,369 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-12-03 16:20:40,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-12-03 16:20:40,369 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-12-03 16:20:40,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-12-03 16:20:40,369 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:20:40,370 INFO L402 BasicCegarLoop]: trace histogram [85, 1, 1, 1] [2018-12-03 16:20:40,370 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:20:40,370 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:20:40,370 INFO L82 PathProgramCache]: Analyzing trace with hash -826171800, now seen corresponding path program 43 times [2018-12-03 16:20:40,370 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:20:40,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:20:40,371 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:20:40,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:20:40,371 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:20:40,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:20:44,471 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 0 proven. 3655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:20:44,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:20:44,472 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:20:44,472 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:20:44,472 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:20:44,472 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:20:44,472 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:20:44,481 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:20:44,481 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:20:44,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:20:45,300 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:20:45,428 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 0 proven. 3655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:20:45,429 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:20:55,956 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 0 proven. 3655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:20:55,975 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:20:55,975 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 174 [2018-12-03 16:20:55,975 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:20:55,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 16:20:55,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 16:20:55,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11145, Invalid=19305, Unknown=0, NotChecked=0, Total=30450 [2018-12-03 16:20:55,977 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 89 states. [2018-12-03 16:20:56,274 WARN L180 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 8 [2018-12-03 16:20:56,535 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 9 [2018-12-03 16:20:56,816 WARN L180 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 16:20:57,100 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 16:20:57,385 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:20:57,668 WARN L180 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:20:57,965 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:20:58,250 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:20:58,544 WARN L180 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:20:58,836 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:20:59,128 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:20:59,413 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:20:59,698 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:20:59,999 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:21:00,297 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:21:00,599 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:21:00,897 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:21:01,203 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:21:01,501 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:21:01,808 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:21:02,138 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:21:02,451 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:21:02,762 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:21:03,079 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:21:03,382 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:21:03,697 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:21:04,003 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:21:04,321 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:21:04,639 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:21:04,937 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:21:05,252 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:21:05,568 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:21:05,868 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:21:06,165 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:21:06,455 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:21:06,746 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:21:07,048 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:21:07,337 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:21:07,627 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:21:07,916 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:21:08,234 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 16:21:17,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:21:17,543 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2018-12-03 16:21:17,543 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 16:21:17,543 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 88 [2018-12-03 16:21:17,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:21:17,544 INFO L225 Difference]: With dead ends: 93 [2018-12-03 16:21:17,545 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 16:21:17,547 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 258 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3827 ImplicationChecksByTransitivity, 35.3s TimeCoverageRelationStatistics Valid=25849, Invalid=41491, Unknown=0, NotChecked=0, Total=67340 [2018-12-03 16:21:17,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 16:21:17,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-12-03 16:21:17,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-12-03 16:21:17,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2018-12-03 16:21:17,551 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2018-12-03 16:21:17,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:21:17,552 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2018-12-03 16:21:17,552 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 16:21:17,552 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2018-12-03 16:21:17,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-12-03 16:21:17,552 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:21:17,552 INFO L402 BasicCegarLoop]: trace histogram [87, 1, 1, 1] [2018-12-03 16:21:17,553 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:21:17,553 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:21:17,553 INFO L82 PathProgramCache]: Analyzing trace with hash 617786760, now seen corresponding path program 44 times [2018-12-03 16:21:17,553 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:21:17,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:21:17,554 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:21:17,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:21:17,554 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:21:18,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:21:21,798 INFO L134 CoverageAnalysis]: Checked inductivity of 3828 backedges. 0 proven. 3828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:21:21,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:21:21,798 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:21:21,798 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:21:21,799 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:21:21,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:21:21,799 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:21:21,807 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:21:21,807 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:21:21,874 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-12-03 16:21:21,875 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:21:21,878 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:21:22,003 INFO L134 CoverageAnalysis]: Checked inductivity of 3828 backedges. 0 proven. 3828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:21:22,003 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:21:32,797 INFO L134 CoverageAnalysis]: Checked inductivity of 3828 backedges. 0 proven. 3828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:21:32,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:21:32,816 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 177 [2018-12-03 16:21:32,816 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:21:32,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-12-03 16:21:32,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-12-03 16:21:32,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11664, Invalid=19842, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 16:21:32,818 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 91 states. [2018-12-03 16:21:33,115 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 8 [2018-12-03 16:21:33,393 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 9 [2018-12-03 16:21:33,696 WARN L180 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 16:21:33,992 WARN L180 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 16:21:34,284 WARN L180 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 16:21:34,580 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 16:21:34,871 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:21:35,163 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:21:35,468 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:21:35,773 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:21:36,069 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:21:36,383 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:21:36,684 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:21:37,000 WARN L180 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:21:37,312 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:21:37,628 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:21:37,942 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:21:38,263 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:21:38,594 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:21:38,933 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:21:39,254 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:21:39,586 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:21:39,911 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:21:40,237 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:21:40,564 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:21:40,876 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:21:41,206 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:21:41,533 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:21:41,856 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:21:42,181 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:21:42,518 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:21:42,844 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:21:43,161 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:21:43,470 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:21:43,800 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:21:44,133 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:21:44,439 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:21:44,738 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:21:45,038 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:21:45,328 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:21:45,917 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:21:55,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:21:55,996 INFO L93 Difference]: Finished difference Result 95 states and 96 transitions. [2018-12-03 16:21:55,997 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 16:21:55,997 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 90 [2018-12-03 16:21:55,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:21:55,998 INFO L225 Difference]: With dead ends: 95 [2018-12-03 16:21:55,998 INFO L226 Difference]: Without dead ends: 93 [2018-12-03 16:21:55,999 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3916 ImplicationChecksByTransitivity, 37.3s TimeCoverageRelationStatistics Valid=26976, Invalid=42984, Unknown=0, NotChecked=0, Total=69960 [2018-12-03 16:21:56,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-12-03 16:21:56,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-12-03 16:21:56,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-03 16:21:56,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-12-03 16:21:56,006 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2018-12-03 16:21:56,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:21:56,006 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-12-03 16:21:56,006 INFO L481 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-12-03 16:21:56,007 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-12-03 16:21:56,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-12-03 16:21:56,007 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:21:56,007 INFO L402 BasicCegarLoop]: trace histogram [89, 1, 1, 1] [2018-12-03 16:21:56,007 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:21:56,008 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:21:56,008 INFO L82 PathProgramCache]: Analyzing trace with hash 987526312, now seen corresponding path program 45 times [2018-12-03 16:21:56,008 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:21:56,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:21:56,009 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:21:56,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:21:56,009 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:21:56,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:22:00,682 INFO L134 CoverageAnalysis]: Checked inductivity of 4005 backedges. 0 proven. 4005 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:22:00,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:22:00,683 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:22:00,683 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:22:00,683 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:22:00,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:22:00,683 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:22:00,692 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:22:00,693 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:22:01,282 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:22:01,282 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:22:01,649 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:22:01,782 INFO L134 CoverageAnalysis]: Checked inductivity of 4005 backedges. 0 proven. 4005 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:22:01,782 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:22:13,167 INFO L134 CoverageAnalysis]: Checked inductivity of 4005 backedges. 0 proven. 4005 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:22:13,186 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:22:13,186 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 182 [2018-12-03 16:22:13,186 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:22:13,186 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-12-03 16:22:13,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-12-03 16:22:13,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12203, Invalid=21103, Unknown=0, NotChecked=0, Total=33306 [2018-12-03 16:22:13,188 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 93 states. [2018-12-03 16:22:13,528 WARN L180 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 8 [2018-12-03 16:22:13,825 WARN L180 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 9 [2018-12-03 16:22:14,127 WARN L180 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 16:22:14,486 WARN L180 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 16:22:14,809 WARN L180 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 16:22:15,105 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 16:22:15,410 WARN L180 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 16:22:15,718 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 16:22:16,043 WARN L180 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:22:16,372 WARN L180 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:22:16,679 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:22:17,001 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:22:17,315 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:22:17,627 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:22:17,953 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:22:18,277 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:22:18,612 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:22:18,952 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:22:19,308 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:22:19,649 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:22:20,007 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:22:20,328 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:22:20,659 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:22:20,991 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:22:21,335 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:22:21,663 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:22:22,002 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:22:22,341 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:22:22,671 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:22:22,995 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:22:23,328 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:22:23,673 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:22:24,004 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:22:24,327 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:22:24,645 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:22:24,994 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:22:25,321 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:22:25,629 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:22:25,940 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:22:26,244 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:22:26,559 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:22:26,862 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:22:27,168 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:22:37,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:22:37,885 INFO L93 Difference]: Finished difference Result 97 states and 98 transitions. [2018-12-03 16:22:37,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 16:22:37,885 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 92 [2018-12-03 16:22:37,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:22:37,886 INFO L225 Difference]: With dead ends: 97 [2018-12-03 16:22:37,886 INFO L226 Difference]: Without dead ends: 95 [2018-12-03 16:22:37,888 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 270 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4185 ImplicationChecksByTransitivity, 39.6s TimeCoverageRelationStatistics Valid=28311, Invalid=45401, Unknown=0, NotChecked=0, Total=73712 [2018-12-03 16:22:37,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-12-03 16:22:37,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2018-12-03 16:22:37,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-12-03 16:22:37,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-12-03 16:22:37,895 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2018-12-03 16:22:37,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:22:37,895 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-12-03 16:22:37,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-12-03 16:22:37,895 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-12-03 16:22:37,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-12-03 16:22:37,896 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:22:37,896 INFO L402 BasicCegarLoop]: trace histogram [91, 1, 1, 1] [2018-12-03 16:22:37,896 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:22:37,896 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:22:37,897 INFO L82 PathProgramCache]: Analyzing trace with hash -175049784, now seen corresponding path program 46 times [2018-12-03 16:22:37,897 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:22:37,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:22:37,897 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:22:37,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:22:37,898 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:22:38,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:22:42,744 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:22:42,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:22:42,744 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:22:42,744 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:22:42,744 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:22:42,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:22:42,745 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:22:42,754 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:22:42,754 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:22:43,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:22:43,754 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:22:43,973 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:22:43,973 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:22:56,032 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:22:56,050 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:22:56,051 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 186 [2018-12-03 16:22:56,051 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:22:56,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 16:22:56,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 16:22:56,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12750, Invalid=22032, Unknown=0, NotChecked=0, Total=34782 [2018-12-03 16:22:56,053 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 95 states. [2018-12-03 16:22:56,367 WARN L180 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 8 [2018-12-03 16:22:56,671 WARN L180 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 9 [2018-12-03 16:22:56,992 WARN L180 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 16:22:57,334 WARN L180 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 16:22:57,653 WARN L180 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 16:22:57,972 WARN L180 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 16:22:58,281 WARN L180 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 16:22:58,595 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 16:22:58,912 WARN L180 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 16:22:59,249 WARN L180 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 16:22:59,579 WARN L180 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:22:59,905 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:23:00,237 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:23:00,567 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:23:00,910 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:23:01,248 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:23:01,607 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:23:01,986 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:23:02,332 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:23:02,680 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:23:03,030 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:23:03,370 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:23:03,731 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:23:04,083 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:23:04,447 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:23:04,810 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:23:05,161 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:23:05,555 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:23:05,949 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:23:06,295 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:23:06,645 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:23:06,993 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:23:07,332 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:23:07,685 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:23:08,028 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:23:08,374 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:23:08,709 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:23:09,049 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:23:09,382 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:23:09,694 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:23:10,018 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:23:10,335 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:23:10,660 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:23:11,000 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:23:11,317 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:23:11,628 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:23:22,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:23:22,276 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-12-03 16:23:22,276 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 16:23:22,276 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 94 [2018-12-03 16:23:22,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:23:22,277 INFO L225 Difference]: With dead ends: 99 [2018-12-03 16:23:22,278 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 16:23:22,280 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 276 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4370 ImplicationChecksByTransitivity, 42.1s TimeCoverageRelationStatistics Valid=29584, Invalid=47422, Unknown=0, NotChecked=0, Total=77006 [2018-12-03 16:23:22,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 16:23:22,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-12-03 16:23:22,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-12-03 16:23:22,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-12-03 16:23:22,286 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2018-12-03 16:23:22,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:23:22,287 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-12-03 16:23:22,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 16:23:22,287 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-12-03 16:23:22,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-12-03 16:23:22,287 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:23:22,287 INFO L402 BasicCegarLoop]: trace histogram [93, 1, 1, 1] [2018-12-03 16:23:22,288 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:23:22,288 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:23:22,288 INFO L82 PathProgramCache]: Analyzing trace with hash -719181080, now seen corresponding path program 47 times [2018-12-03 16:23:22,288 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:23:22,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:23:22,289 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:23:22,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:23:22,289 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:23:22,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:23:27,826 INFO L134 CoverageAnalysis]: Checked inductivity of 4371 backedges. 0 proven. 4371 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:23:27,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:23:27,827 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:23:27,827 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:23:27,827 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:23:27,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:23:27,827 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:23:27,836 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:23:27,836 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:23:27,905 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-12-03 16:23:27,905 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:23:27,910 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:23:28,048 INFO L134 CoverageAnalysis]: Checked inductivity of 4371 backedges. 0 proven. 4371 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:23:28,048 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:23:40,117 INFO L134 CoverageAnalysis]: Checked inductivity of 4371 backedges. 0 proven. 4371 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:23:40,136 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:23:40,136 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 189 [2018-12-03 16:23:40,136 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:23:40,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 97 states [2018-12-03 16:23:40,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2018-12-03 16:23:40,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13305, Invalid=22605, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 16:23:40,138 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 97 states. [2018-12-03 16:23:40,463 WARN L180 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 8 [2018-12-03 16:23:40,775 WARN L180 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 9 [2018-12-03 16:23:41,104 WARN L180 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 16:23:41,432 WARN L180 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 16:23:41,778 WARN L180 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 16:23:42,103 WARN L180 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 16:23:42,443 WARN L180 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 16:23:42,759 WARN L180 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 16:23:43,089 WARN L180 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 16:23:43,424 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 16:23:43,748 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 16:23:44,152 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 16:23:44,491 WARN L180 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:23:44,812 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:23:45,159 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:23:45,511 WARN L180 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:23:45,860 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:23:46,228 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:23:46,592 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:23:46,980 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:23:47,342 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:23:47,705 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:23:48,071 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:23:48,433 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:23:48,801 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:23:49,181 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:23:49,551 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:23:49,911 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:23:50,281 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:23:50,640 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:23:51,007 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:23:51,358 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:23:51,728 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:23:52,113 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:23:52,458 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:23:52,815 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:23:53,169 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:23:53,513 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:23:53,877 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:23:54,212 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:23:54,537 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:23:54,865 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:23:55,184 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:23:55,502 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:23:56,148 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:23:56,480 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:23:56,818 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:23:57,164 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 16:24:07,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:24:07,825 INFO L93 Difference]: Finished difference Result 101 states and 102 transitions. [2018-12-03 16:24:07,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-12-03 16:24:07,826 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 96 [2018-12-03 16:24:07,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:24:07,827 INFO L225 Difference]: With dead ends: 101 [2018-12-03 16:24:07,827 INFO L226 Difference]: Without dead ends: 99 [2018-12-03 16:24:07,830 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 281 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4465 ImplicationChecksByTransitivity, 44.2s TimeCoverageRelationStatistics Valid=30789, Invalid=49017, Unknown=0, NotChecked=0, Total=79806 [2018-12-03 16:24:07,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-12-03 16:24:07,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-12-03 16:24:07,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-12-03 16:24:07,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-12-03 16:24:07,836 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2018-12-03 16:24:07,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:24:07,836 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-12-03 16:24:07,836 INFO L481 AbstractCegarLoop]: Interpolant automaton has 97 states. [2018-12-03 16:24:07,836 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-12-03 16:24:07,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-12-03 16:24:07,836 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:24:07,836 INFO L402 BasicCegarLoop]: trace histogram [95, 1, 1, 1] [2018-12-03 16:24:07,837 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:24:07,837 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:24:07,837 INFO L82 PathProgramCache]: Analyzing trace with hash 356653576, now seen corresponding path program 48 times [2018-12-03 16:24:07,837 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:24:07,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:24:07,837 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:24:07,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:24:07,838 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:24:08,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:24:13,050 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 0 proven. 4560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:24:13,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:24:13,051 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:24:13,051 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:24:13,051 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:24:13,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:24:13,051 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:24:13,060 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:24:13,061 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:24:13,765 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:24:13,766 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:24:14,196 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:24:14,441 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 0 proven. 4560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:24:14,442 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:24:27,237 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 0 proven. 4560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:24:27,256 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:24:27,257 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 194 [2018-12-03 16:24:27,257 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:24:27,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-12-03 16:24:27,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-12-03 16:24:27,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13880, Invalid=23950, Unknown=0, NotChecked=0, Total=37830 [2018-12-03 16:24:27,259 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 99 states. [2018-12-03 16:24:27,621 WARN L180 SmtUtils]: Spent 308.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 8 [2018-12-03 16:24:27,971 WARN L180 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 9 [2018-12-03 16:24:28,316 WARN L180 SmtUtils]: Spent 314.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 16:24:28,649 WARN L180 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 16:24:28,993 WARN L180 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 16:24:29,324 WARN L180 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 16:24:29,663 WARN L180 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 16:24:29,999 WARN L180 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 16:24:30,363 WARN L180 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 16:24:30,713 WARN L180 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 16:24:31,056 WARN L180 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 16:24:31,414 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 16:24:31,746 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 16:24:32,075 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 16:24:32,439 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:24:32,838 WARN L180 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:24:33,227 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:24:33,596 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:24:33,969 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:24:34,346 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:24:34,726 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:24:35,107 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:24:35,505 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:24:35,877 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:24:36,246 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:24:36,622 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:24:37,007 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:24:37,382 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:24:37,760 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:24:38,167 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:24:38,534 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:24:38,898 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:24:39,268 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:24:39,634 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:24:40,004 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:24:40,372 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:24:40,730 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:24:41,091 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:24:41,462 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:24:41,808 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:24:42,161 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:24:42,506 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:24:42,841 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:24:43,203 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:24:43,534 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:24:43,879 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:24:44,220 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:24:44,562 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:24:44,896 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:24:45,228 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:24:56,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:24:56,233 INFO L93 Difference]: Finished difference Result 103 states and 104 transitions. [2018-12-03 16:24:56,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 16:24:56,233 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 98 [2018-12-03 16:24:56,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:24:56,234 INFO L225 Difference]: With dead ends: 103 [2018-12-03 16:24:56,234 INFO L226 Difference]: Without dead ends: 101 [2018-12-03 16:24:56,237 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 288 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4752 ImplicationChecksByTransitivity, 45.9s TimeCoverageRelationStatistics Valid=32214, Invalid=51596, Unknown=0, NotChecked=0, Total=83810 [2018-12-03 16:24:56,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-12-03 16:24:56,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2018-12-03 16:24:56,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-12-03 16:24:56,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-12-03 16:24:56,242 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2018-12-03 16:24:56,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:24:56,242 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-12-03 16:24:56,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-12-03 16:24:56,242 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-12-03 16:24:56,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-12-03 16:24:56,243 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:24:56,243 INFO L402 BasicCegarLoop]: trace histogram [97, 1, 1, 1] [2018-12-03 16:24:56,243 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:24:56,243 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:24:56,243 INFO L82 PathProgramCache]: Analyzing trace with hash -853360344, now seen corresponding path program 49 times [2018-12-03 16:24:56,244 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:24:56,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:24:56,244 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:24:56,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:24:56,245 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:24:56,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:25:01,507 INFO L134 CoverageAnalysis]: Checked inductivity of 4753 backedges. 0 proven. 4753 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:25:01,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:25:01,508 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:25:01,508 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:25:01,508 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:25:01,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:25:01,508 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:25:01,517 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:25:01,517 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:25:02,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:25:02,847 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:25:03,958 INFO L134 CoverageAnalysis]: Checked inductivity of 4753 backedges. 0 proven. 4753 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:25:03,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:25:17,380 INFO L134 CoverageAnalysis]: Checked inductivity of 4753 backedges. 0 proven. 4753 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:25:17,399 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:25:17,399 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 198 [2018-12-03 16:25:17,399 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:25:17,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 16:25:17,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 16:25:17,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14463, Invalid=24939, Unknown=0, NotChecked=0, Total=39402 [2018-12-03 16:25:17,401 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 101 states. [2018-12-03 16:25:17,752 WARN L180 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 8 [2018-12-03 16:25:18,086 WARN L180 SmtUtils]: Spent 310.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 9 [2018-12-03 16:25:18,431 WARN L180 SmtUtils]: Spent 312.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2018-12-03 16:25:18,796 WARN L180 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2018-12-03 16:25:19,164 WARN L180 SmtUtils]: Spent 318.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 16:25:19,507 WARN L180 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 16:25:19,867 WARN L180 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 16:25:20,225 WARN L180 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 16:25:20,595 WARN L180 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 16:25:20,972 WARN L180 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 16:25:21,348 WARN L180 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 16:25:21,704 WARN L180 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 16:25:22,059 WARN L180 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 16:25:22,430 WARN L180 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 16:25:22,838 WARN L180 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 16:25:23,229 WARN L180 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 16:25:23,617 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:25:24,039 WARN L180 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:25:24,441 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:25:24,846 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:25:25,248 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:25:25,653 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:25:26,056 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:25:26,449 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:25:26,853 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:25:27,259 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:25:27,657 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:25:28,065 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:25:28,454 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:25:28,848 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:25:29,276 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:25:29,678 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:25:30,085 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:25:30,488 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:25:30,920 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:25:31,316 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11