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_compound_exp_cong.epf -i ../../../trunk/examples/programs/real-life/threadpooling_product.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 15:08:07,971 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 15:08:07,973 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 15:08:07,989 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 15:08:07,989 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 15:08:07,990 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 15:08:07,992 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 15:08:07,995 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 15:08:07,997 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 15:08:07,999 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 15:08:08,001 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-03 15:08:08,001 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-03 15:08:08,002 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-03 15:08:08,006 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-03 15:08:08,007 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-03 15:08:08,009 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-03 15:08:08,010 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-03 15:08:08,017 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-03 15:08:08,019 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-03 15:08:08,020 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-03 15:08:08,021 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-03 15:08:08,022 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-03 15:08:08,024 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-03 15:08:08,024 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-03 15:08:08,024 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-03 15:08:08,025 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-03 15:08:08,026 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-03 15:08:08,027 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-03 15:08:08,027 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-03 15:08:08,028 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-03 15:08:08,029 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-03 15:08:08,029 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-12-03 15:08:08,032 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_exp_cong.epf [2018-12-03 15:08:08,045 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 15:08:08,046 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 15:08:08,046 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 15:08:08,048 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 15:08:08,049 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 15:08:08,049 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 15:08:08,049 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 15:08:08,049 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 15:08:08,049 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-03 15:08:08,049 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 15:08:08,050 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-03 15:08:08,050 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 15:08:08,050 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 15:08:08,051 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 15:08:08,051 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 15:08:08,052 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 15:08:08,052 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 15:08:08,052 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 15:08:08,052 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 15:08:08,052 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 15:08:08,052 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 15:08:08,054 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 15:08:08,054 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 15:08:08,054 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 15:08:08,055 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 15:08:08,055 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 15:08:08,055 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 15:08:08,055 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 15:08:08,055 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 15:08:08,056 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 15:08:08,056 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 15:08:08,056 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 15:08:08,056 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 15:08:08,057 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 15:08:08,057 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 15:08:08,057 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 15:08:08,057 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 15:08:08,057 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 15:08:08,058 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 15:08:08,058 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 15:08:08,058 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 15:08:08,110 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 15:08:08,124 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 15:08:08,132 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 15:08:08,133 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 15:08:08,134 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 15:08:08,135 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/real-life/threadpooling_product.bpl [2018-12-03 15:08:08,135 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/real-life/threadpooling_product.bpl' [2018-12-03 15:08:08,188 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 15:08:08,189 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 15:08:08,190 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 15:08:08,190 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 15:08:08,191 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 15:08:08,209 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 03:08:08" (1/1) ... [2018-12-03 15:08:08,220 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 03:08:08" (1/1) ... [2018-12-03 15:08:08,226 WARN L165 Inliner]: Program contained no entry procedure! [2018-12-03 15:08:08,226 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2018-12-03 15:08:08,226 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2018-12-03 15:08:08,228 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 15:08:08,229 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 15:08:08,230 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 15:08:08,230 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 15:08:08,242 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 03:08:08" (1/1) ... [2018-12-03 15:08:08,242 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 03:08:08" (1/1) ... [2018-12-03 15:08:08,243 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 03:08:08" (1/1) ... [2018-12-03 15:08:08,243 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 03:08:08" (1/1) ... [2018-12-03 15:08:08,247 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 03:08:08" (1/1) ... [2018-12-03 15:08:08,251 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 03:08:08" (1/1) ... [2018-12-03 15:08:08,252 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 03:08:08" (1/1) ... [2018-12-03 15:08:08,254 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 15:08:08,254 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 15:08:08,254 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 15:08:08,255 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 15:08:08,256 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 03:08:08" (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 15:08:08,326 INFO L124 BoogieDeclarations]: Specification and implementation of procedure product given in one single declaration [2018-12-03 15:08:08,326 INFO L130 BoogieDeclarations]: Found specification of procedure product [2018-12-03 15:08:08,327 INFO L138 BoogieDeclarations]: Found implementation of procedure product [2018-12-03 15:08:08,876 INFO L272 CfgBuilder]: Using library mode [2018-12-03 15:08:08,876 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-03 15:08:08,877 INFO L202 PluginConnector]: Adding new model threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 03:08:08 BoogieIcfgContainer [2018-12-03 15:08:08,877 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 15:08:08,878 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 15:08:08,879 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 15:08:08,882 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 15:08:08,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 03:08:08" (1/2) ... [2018-12-03 15:08:08,884 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29ec2315 and model type threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 03:08:08, skipping insertion in model container [2018-12-03 15:08:08,884 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 03:08:08" (2/2) ... [2018-12-03 15:08:08,886 INFO L112 eAbstractionObserver]: Analyzing ICFG threadpooling_product.bpl [2018-12-03 15:08:08,897 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 15:08:08,906 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-12-03 15:08:08,926 INFO L257 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2018-12-03 15:08:08,963 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 15:08:08,963 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 15:08:08,964 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 15:08:08,964 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 15:08:08,964 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 15:08:08,964 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 15:08:08,965 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 15:08:08,965 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 15:08:08,983 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-12-03 15:08:08,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-03 15:08:08,990 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:08,991 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-12-03 15:08:08,994 INFO L423 AbstractCegarLoop]: === Iteration 1 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:09,000 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:09,001 INFO L82 PathProgramCache]: Analyzing trace with hash 28755683, now seen corresponding path program 1 times [2018-12-03 15:08:09,004 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:09,062 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:09,062 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:09,062 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:09,062 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:09,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:09,247 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 15:08:09,249 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 15:08:09,250 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 15:08:09,250 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:09,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 15:08:09,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 15:08:09,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-03 15:08:09,270 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 5 states. [2018-12-03 15:08:09,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:09,876 INFO L93 Difference]: Finished difference Result 49 states and 85 transitions. [2018-12-03 15:08:09,877 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 15:08:09,879 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2018-12-03 15:08:09,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:09,893 INFO L225 Difference]: With dead ends: 49 [2018-12-03 15:08:09,894 INFO L226 Difference]: Without dead ends: 47 [2018-12-03 15:08:09,898 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-03 15:08:09,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-12-03 15:08:09,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 30. [2018-12-03 15:08:09,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-03 15:08:09,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 49 transitions. [2018-12-03 15:08:09,944 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 49 transitions. Word has length 5 [2018-12-03 15:08:09,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:09,945 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 49 transitions. [2018-12-03 15:08:09,945 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 15:08:09,945 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 49 transitions. [2018-12-03 15:08:09,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-03 15:08:09,946 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:09,946 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-12-03 15:08:09,947 INFO L423 AbstractCegarLoop]: === Iteration 2 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:09,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:09,947 INFO L82 PathProgramCache]: Analyzing trace with hash 28971747, now seen corresponding path program 1 times [2018-12-03 15:08:09,947 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:09,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:09,949 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:09,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:09,949 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:09,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:10,065 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 15:08:10,065 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 15:08:10,065 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 15:08:10,066 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:10,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 15:08:10,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 15:08:10,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-03 15:08:10,069 INFO L87 Difference]: Start difference. First operand 30 states and 49 transitions. Second operand 5 states. [2018-12-03 15:08:10,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:10,462 INFO L93 Difference]: Finished difference Result 57 states and 99 transitions. [2018-12-03 15:08:10,463 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 15:08:10,463 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2018-12-03 15:08:10,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:10,464 INFO L225 Difference]: With dead ends: 57 [2018-12-03 15:08:10,464 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 15:08:10,466 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-03 15:08:10,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 15:08:10,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 38. [2018-12-03 15:08:10,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-12-03 15:08:10,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 63 transitions. [2018-12-03 15:08:10,476 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 63 transitions. Word has length 5 [2018-12-03 15:08:10,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:10,476 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 63 transitions. [2018-12-03 15:08:10,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 15:08:10,476 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 63 transitions. [2018-12-03 15:08:10,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-12-03 15:08:10,477 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:10,477 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:10,478 INFO L423 AbstractCegarLoop]: === Iteration 3 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:10,478 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:10,478 INFO L82 PathProgramCache]: Analyzing trace with hash 1864688358, now seen corresponding path program 1 times [2018-12-03 15:08:10,479 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:10,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:10,480 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:10,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:10,480 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:10,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:10,891 WARN L180 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 7 [2018-12-03 15:08:10,933 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 15:08:10,933 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 15:08:10,934 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-03 15:08:10,934 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:10,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:08:10,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:08:10,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2018-12-03 15:08:10,935 INFO L87 Difference]: Start difference. First operand 38 states and 63 transitions. Second operand 7 states. [2018-12-03 15:08:12,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:12,276 INFO L93 Difference]: Finished difference Result 84 states and 147 transitions. [2018-12-03 15:08:12,277 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 15:08:12,277 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2018-12-03 15:08:12,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:12,281 INFO L225 Difference]: With dead ends: 84 [2018-12-03 15:08:12,281 INFO L226 Difference]: Without dead ends: 82 [2018-12-03 15:08:12,284 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-12-03 15:08:12,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-12-03 15:08:12,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 51. [2018-12-03 15:08:12,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 15:08:12,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 86 transitions. [2018-12-03 15:08:12,307 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 86 transitions. Word has length 7 [2018-12-03 15:08:12,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:12,308 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 86 transitions. [2018-12-03 15:08:12,308 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:08:12,308 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 86 transitions. [2018-12-03 15:08:12,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-12-03 15:08:12,311 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:12,311 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2018-12-03 15:08:12,313 INFO L423 AbstractCegarLoop]: === Iteration 4 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:12,315 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:12,315 INFO L82 PathProgramCache]: Analyzing trace with hash 1865765160, now seen corresponding path program 1 times [2018-12-03 15:08:12,316 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:12,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:12,317 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:12,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:12,318 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:12,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:12,564 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:12,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:12,564 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:12,565 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 8 with the following transitions: [2018-12-03 15:08:12,567 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [9], [20], [21] [2018-12-03 15:08:12,604 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:12,604 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:12,690 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:12,691 INFO L272 AbstractInterpreter]: Visited 6 different actions 6 times. Never merged. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:12,706 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:12,707 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:12,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:12,707 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 15:08:12,717 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:12,718 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:12,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:12,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:12,850 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:12,851 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:12,863 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:12,882 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 15:08:12,883 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 8 [2018-12-03 15:08:12,883 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:12,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 15:08:12,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 15:08:12,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2018-12-03 15:08:12,884 INFO L87 Difference]: Start difference. First operand 51 states and 86 transitions. Second operand 4 states. [2018-12-03 15:08:12,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:12,968 INFO L93 Difference]: Finished difference Result 82 states and 137 transitions. [2018-12-03 15:08:12,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 15:08:12,969 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 7 [2018-12-03 15:08:12,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:12,970 INFO L225 Difference]: With dead ends: 82 [2018-12-03 15:08:12,970 INFO L226 Difference]: Without dead ends: 48 [2018-12-03 15:08:12,971 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2018-12-03 15:08:12,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-12-03 15:08:12,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-12-03 15:08:12,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-03 15:08:12,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 76 transitions. [2018-12-03 15:08:12,980 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 76 transitions. Word has length 7 [2018-12-03 15:08:12,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:12,980 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 76 transitions. [2018-12-03 15:08:12,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 15:08:12,981 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 76 transitions. [2018-12-03 15:08:12,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-12-03 15:08:12,981 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:12,982 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:12,982 INFO L423 AbstractCegarLoop]: === Iteration 5 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:12,982 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:12,983 INFO L82 PathProgramCache]: Analyzing trace with hash 2072633864, now seen corresponding path program 1 times [2018-12-03 15:08:12,983 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:12,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:12,984 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:12,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:12,984 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:12,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:13,156 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 15:08:13,157 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:13,157 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:13,157 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 8 with the following transitions: [2018-12-03 15:08:13,157 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [16], [20], [21] [2018-12-03 15:08:13,159 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:13,159 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:13,177 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:13,177 INFO L272 AbstractInterpreter]: Visited 7 different actions 7 times. Never merged. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:13,194 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:13,194 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:13,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:13,194 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 15:08:13,203 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:13,204 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:13,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:13,210 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:13,277 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:13,277 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:13,317 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:13,337 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 15:08:13,337 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 8 [2018-12-03 15:08:13,337 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:13,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 15:08:13,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 15:08:13,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2018-12-03 15:08:13,338 INFO L87 Difference]: Start difference. First operand 48 states and 76 transitions. Second operand 4 states. [2018-12-03 15:08:13,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:13,431 INFO L93 Difference]: Finished difference Result 82 states and 129 transitions. [2018-12-03 15:08:13,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 15:08:13,433 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 7 [2018-12-03 15:08:13,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:13,434 INFO L225 Difference]: With dead ends: 82 [2018-12-03 15:08:13,434 INFO L226 Difference]: Without dead ends: 48 [2018-12-03 15:08:13,435 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2018-12-03 15:08:13,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-12-03 15:08:13,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-12-03 15:08:13,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-03 15:08:13,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 70 transitions. [2018-12-03 15:08:13,444 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 70 transitions. Word has length 7 [2018-12-03 15:08:13,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:13,444 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 70 transitions. [2018-12-03 15:08:13,444 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 15:08:13,445 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 70 transitions. [2018-12-03 15:08:13,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-12-03 15:08:13,445 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:13,446 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:13,446 INFO L423 AbstractCegarLoop]: === Iteration 6 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:13,446 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:13,446 INFO L82 PathProgramCache]: Analyzing trace with hash 2071833542, now seen corresponding path program 1 times [2018-12-03 15:08:13,447 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:13,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:13,448 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:13,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:13,448 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:13,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:13,573 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 15:08:13,573 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 15:08:13,573 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-03 15:08:13,574 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:13,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:08:13,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:08:13,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2018-12-03 15:08:13,575 INFO L87 Difference]: Start difference. First operand 48 states and 70 transitions. Second operand 7 states. [2018-12-03 15:08:13,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:13,875 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2018-12-03 15:08:13,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 15:08:13,876 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2018-12-03 15:08:13,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:13,877 INFO L225 Difference]: With dead ends: 62 [2018-12-03 15:08:13,877 INFO L226 Difference]: Without dead ends: 60 [2018-12-03 15:08:13,878 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-12-03 15:08:13,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-12-03 15:08:13,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2018-12-03 15:08:13,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-12-03 15:08:13,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 85 transitions. [2018-12-03 15:08:13,889 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 85 transitions. Word has length 7 [2018-12-03 15:08:13,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:13,889 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 85 transitions. [2018-12-03 15:08:13,889 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:08:13,889 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 85 transitions. [2018-12-03 15:08:13,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 15:08:13,890 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:13,890 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:13,891 INFO L423 AbstractCegarLoop]: === Iteration 7 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:13,891 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:13,891 INFO L82 PathProgramCache]: Analyzing trace with hash 101966393, now seen corresponding path program 1 times [2018-12-03 15:08:13,891 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:13,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:13,892 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:13,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:13,893 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:13,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:14,029 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 15:08:14,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:14,030 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:14,030 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 15:08:14,030 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [25], [29], [32], [65], [66] [2018-12-03 15:08:14,032 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:14,032 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:14,061 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:14,061 INFO L272 AbstractInterpreter]: Visited 10 different actions 15 times. Merged at 5 different actions 5 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:14,068 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:14,068 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:14,068 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:14,068 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 15:08:14,079 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:14,079 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:14,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:14,093 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:14,288 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 15:08:14,289 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:14,392 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 15:08:14,411 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:14,411 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 19 [2018-12-03 15:08:14,411 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:14,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 15:08:14,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 15:08:14,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2018-12-03 15:08:14,412 INFO L87 Difference]: Start difference. First operand 58 states and 85 transitions. Second operand 14 states. [2018-12-03 15:08:15,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:15,038 INFO L93 Difference]: Finished difference Result 93 states and 137 transitions. [2018-12-03 15:08:15,039 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 15:08:15,040 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 10 [2018-12-03 15:08:15,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:15,041 INFO L225 Difference]: With dead ends: 93 [2018-12-03 15:08:15,041 INFO L226 Difference]: Without dead ends: 92 [2018-12-03 15:08:15,043 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=179, Invalid=751, Unknown=0, NotChecked=0, Total=930 [2018-12-03 15:08:15,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-12-03 15:08:15,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 77. [2018-12-03 15:08:15,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-12-03 15:08:15,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 119 transitions. [2018-12-03 15:08:15,055 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 119 transitions. Word has length 10 [2018-12-03 15:08:15,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:15,056 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 119 transitions. [2018-12-03 15:08:15,056 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 15:08:15,056 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 119 transitions. [2018-12-03 15:08:15,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 15:08:15,057 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:15,057 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:15,057 INFO L423 AbstractCegarLoop]: === Iteration 8 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:15,058 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:15,058 INFO L82 PathProgramCache]: Analyzing trace with hash 103259259, now seen corresponding path program 1 times [2018-12-03 15:08:15,058 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:15,059 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:15,059 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:15,059 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:15,059 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:15,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:15,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:15,230 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 15:08:15,230 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-12-03 15:08:15,230 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:15,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 15:08:15,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 15:08:15,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2018-12-03 15:08:15,231 INFO L87 Difference]: Start difference. First operand 77 states and 119 transitions. Second operand 8 states. [2018-12-03 15:08:15,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:15,778 INFO L93 Difference]: Finished difference Result 98 states and 142 transitions. [2018-12-03 15:08:15,779 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 15:08:15,779 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2018-12-03 15:08:15,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:15,780 INFO L225 Difference]: With dead ends: 98 [2018-12-03 15:08:15,780 INFO L226 Difference]: Without dead ends: 96 [2018-12-03 15:08:15,781 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=84, Invalid=222, Unknown=0, NotChecked=0, Total=306 [2018-12-03 15:08:15,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-12-03 15:08:15,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 80. [2018-12-03 15:08:15,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-12-03 15:08:15,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 125 transitions. [2018-12-03 15:08:15,794 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 125 transitions. Word has length 10 [2018-12-03 15:08:15,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:15,794 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 125 transitions. [2018-12-03 15:08:15,794 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 15:08:15,794 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 125 transitions. [2018-12-03 15:08:15,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 15:08:15,795 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:15,795 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:15,796 INFO L423 AbstractCegarLoop]: === Iteration 9 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:15,796 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:15,796 INFO L82 PathProgramCache]: Analyzing trace with hash -176034144, now seen corresponding path program 1 times [2018-12-03 15:08:15,796 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:15,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:15,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:15,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:15,797 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:15,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:15,873 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:15,874 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:15,874 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:15,874 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 15:08:15,874 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [65], [66], [67], [70] [2018-12-03 15:08:15,876 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:15,876 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:15,889 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:15,890 INFO L272 AbstractInterpreter]: Visited 9 different actions 10 times. Merged at 1 different actions 1 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:15,925 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:15,925 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:15,925 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:15,925 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 15:08:15,936 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:15,936 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:15,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:15,945 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:16,192 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:16,193 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:16,489 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:16,510 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:16,510 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2018-12-03 15:08:16,510 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:16,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 15:08:16,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 15:08:16,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2018-12-03 15:08:16,512 INFO L87 Difference]: Start difference. First operand 80 states and 125 transitions. Second operand 14 states. [2018-12-03 15:08:17,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:17,210 INFO L93 Difference]: Finished difference Result 120 states and 190 transitions. [2018-12-03 15:08:17,211 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 15:08:17,211 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 10 [2018-12-03 15:08:17,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:17,212 INFO L225 Difference]: With dead ends: 120 [2018-12-03 15:08:17,212 INFO L226 Difference]: Without dead ends: 118 [2018-12-03 15:08:17,213 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2018-12-03 15:08:17,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-12-03 15:08:17,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 81. [2018-12-03 15:08:17,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-03 15:08:17,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 127 transitions. [2018-12-03 15:08:17,228 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 127 transitions. Word has length 10 [2018-12-03 15:08:17,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:17,228 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 127 transitions. [2018-12-03 15:08:17,229 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 15:08:17,229 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 127 transitions. [2018-12-03 15:08:17,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 15:08:17,229 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:17,230 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:17,230 INFO L423 AbstractCegarLoop]: === Iteration 10 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:17,230 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:17,230 INFO L82 PathProgramCache]: Analyzing trace with hash -176034432, now seen corresponding path program 1 times [2018-12-03 15:08:17,230 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:17,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:17,231 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:17,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:17,232 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:17,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:17,343 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 15:08:17,343 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:17,343 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:17,344 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 15:08:17,344 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [56], [57], [65], [67], [70] [2018-12-03 15:08:17,346 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:17,346 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:17,360 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:17,361 INFO L272 AbstractInterpreter]: Visited 10 different actions 13 times. Merged at 3 different actions 3 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:17,377 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:17,377 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:17,377 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:17,377 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 15:08:17,386 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:17,386 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:17,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:17,395 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:17,544 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 15:08:17,544 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:17,689 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 15:08:17,714 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:17,715 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 17 [2018-12-03 15:08:17,715 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:17,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 15:08:17,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 15:08:17,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2018-12-03 15:08:17,716 INFO L87 Difference]: Start difference. First operand 81 states and 127 transitions. Second operand 13 states. [2018-12-03 15:08:18,700 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2018-12-03 15:08:20,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:20,465 INFO L93 Difference]: Finished difference Result 164 states and 242 transitions. [2018-12-03 15:08:20,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 15:08:20,466 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 10 [2018-12-03 15:08:20,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:20,467 INFO L225 Difference]: With dead ends: 164 [2018-12-03 15:08:20,468 INFO L226 Difference]: Without dead ends: 162 [2018-12-03 15:08:20,470 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=459, Invalid=1991, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 15:08:20,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-12-03 15:08:20,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 108. [2018-12-03 15:08:20,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-12-03 15:08:20,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 174 transitions. [2018-12-03 15:08:20,494 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 174 transitions. Word has length 10 [2018-12-03 15:08:20,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:20,495 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 174 transitions. [2018-12-03 15:08:20,495 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 15:08:20,495 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 174 transitions. [2018-12-03 15:08:20,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 15:08:20,496 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:20,496 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:20,496 INFO L423 AbstractCegarLoop]: === Iteration 11 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:20,497 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:20,497 INFO L82 PathProgramCache]: Analyzing trace with hash -184622601, now seen corresponding path program 1 times [2018-12-03 15:08:20,497 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:20,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:20,498 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:20,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:20,499 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:20,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:20,683 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 15:08:20,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:20,683 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:20,683 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 15:08:20,684 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [56], [58], [61], [65], [66] [2018-12-03 15:08:20,685 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:20,685 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:20,701 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:20,701 INFO L272 AbstractInterpreter]: Visited 10 different actions 13 times. Merged at 3 different actions 3 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:20,720 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:20,720 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:20,720 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:20,720 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 15:08:20,730 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:20,730 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:20,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:20,739 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:20,891 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 15:08:20,891 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:20,971 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 15:08:20,992 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:20,992 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 19 [2018-12-03 15:08:20,992 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:20,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 15:08:20,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 15:08:20,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2018-12-03 15:08:20,994 INFO L87 Difference]: Start difference. First operand 108 states and 174 transitions. Second operand 14 states. [2018-12-03 15:08:22,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:22,262 INFO L93 Difference]: Finished difference Result 164 states and 252 transitions. [2018-12-03 15:08:22,262 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 15:08:22,263 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 10 [2018-12-03 15:08:22,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:22,264 INFO L225 Difference]: With dead ends: 164 [2018-12-03 15:08:22,264 INFO L226 Difference]: Without dead ends: 163 [2018-12-03 15:08:22,265 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=209, Invalid=721, Unknown=0, NotChecked=0, Total=930 [2018-12-03 15:08:22,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-12-03 15:08:22,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 122. [2018-12-03 15:08:22,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-12-03 15:08:22,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 197 transitions. [2018-12-03 15:08:22,284 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 197 transitions. Word has length 10 [2018-12-03 15:08:22,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:22,284 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 197 transitions. [2018-12-03 15:08:22,284 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 15:08:22,285 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 197 transitions. [2018-12-03 15:08:22,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 15:08:22,286 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:22,286 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:22,286 INFO L423 AbstractCegarLoop]: === Iteration 12 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:22,286 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:22,287 INFO L82 PathProgramCache]: Analyzing trace with hash -184621319, now seen corresponding path program 1 times [2018-12-03 15:08:22,287 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:22,288 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:22,288 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:22,288 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:22,288 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:22,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:22,414 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 15:08:22,415 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 15:08:22,415 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-12-03 15:08:22,415 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:22,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 15:08:22,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 15:08:22,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2018-12-03 15:08:22,416 INFO L87 Difference]: Start difference. First operand 122 states and 197 transitions. Second operand 8 states. [2018-12-03 15:08:23,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:23,106 INFO L93 Difference]: Finished difference Result 143 states and 218 transitions. [2018-12-03 15:08:23,107 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 15:08:23,107 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2018-12-03 15:08:23,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:23,108 INFO L225 Difference]: With dead ends: 143 [2018-12-03 15:08:23,108 INFO L226 Difference]: Without dead ends: 141 [2018-12-03 15:08:23,108 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2018-12-03 15:08:23,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-12-03 15:08:23,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 126. [2018-12-03 15:08:23,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-12-03 15:08:23,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 204 transitions. [2018-12-03 15:08:23,127 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 204 transitions. Word has length 10 [2018-12-03 15:08:23,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:23,127 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 204 transitions. [2018-12-03 15:08:23,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 15:08:23,128 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 204 transitions. [2018-12-03 15:08:23,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 15:08:23,128 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:23,128 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:23,129 INFO L423 AbstractCegarLoop]: === Iteration 13 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:23,129 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:23,129 INFO L82 PathProgramCache]: Analyzing trace with hash -973282432, now seen corresponding path program 1 times [2018-12-03 15:08:23,129 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:23,130 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:23,130 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:23,130 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:23,130 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:23,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:23,254 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 15:08:23,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:23,254 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:23,254 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 15:08:23,255 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [57], [65], [67], [70] [2018-12-03 15:08:23,256 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:23,256 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:23,269 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:23,269 INFO L272 AbstractInterpreter]: Visited 10 different actions 13 times. Merged at 3 different actions 3 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:23,276 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:23,276 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:23,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:23,276 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 15:08:23,286 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:23,286 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:23,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:23,291 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:23,408 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 15:08:23,408 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:23,488 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 15:08:23,508 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:23,508 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 19 [2018-12-03 15:08:23,508 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:23,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 15:08:23,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 15:08:23,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2018-12-03 15:08:23,509 INFO L87 Difference]: Start difference. First operand 126 states and 204 transitions. Second operand 14 states. [2018-12-03 15:08:24,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:24,283 INFO L93 Difference]: Finished difference Result 177 states and 275 transitions. [2018-12-03 15:08:24,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 15:08:24,289 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 10 [2018-12-03 15:08:24,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:24,290 INFO L225 Difference]: With dead ends: 177 [2018-12-03 15:08:24,290 INFO L226 Difference]: Without dead ends: 176 [2018-12-03 15:08:24,291 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=209, Invalid=721, Unknown=0, NotChecked=0, Total=930 [2018-12-03 15:08:24,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2018-12-03 15:08:24,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 140. [2018-12-03 15:08:24,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2018-12-03 15:08:24,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 230 transitions. [2018-12-03 15:08:24,313 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 230 transitions. Word has length 10 [2018-12-03 15:08:24,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:24,314 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 230 transitions. [2018-12-03 15:08:24,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 15:08:24,314 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 230 transitions. [2018-12-03 15:08:24,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 15:08:24,315 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:24,315 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:24,315 INFO L423 AbstractCegarLoop]: === Iteration 14 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:24,315 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:24,315 INFO L82 PathProgramCache]: Analyzing trace with hash -973281662, now seen corresponding path program 1 times [2018-12-03 15:08:24,315 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:24,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:24,316 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:24,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:24,317 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:24,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:24,454 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 15:08:24,454 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 15:08:24,454 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-12-03 15:08:24,455 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:24,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 15:08:24,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 15:08:24,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2018-12-03 15:08:24,455 INFO L87 Difference]: Start difference. First operand 140 states and 230 transitions. Second operand 8 states. [2018-12-03 15:08:24,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:24,855 INFO L93 Difference]: Finished difference Result 155 states and 242 transitions. [2018-12-03 15:08:24,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 15:08:24,855 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2018-12-03 15:08:24,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:24,857 INFO L225 Difference]: With dead ends: 155 [2018-12-03 15:08:24,857 INFO L226 Difference]: Without dead ends: 153 [2018-12-03 15:08:24,857 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2018-12-03 15:08:24,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2018-12-03 15:08:24,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 140. [2018-12-03 15:08:24,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2018-12-03 15:08:24,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 230 transitions. [2018-12-03 15:08:24,879 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 230 transitions. Word has length 10 [2018-12-03 15:08:24,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:24,880 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 230 transitions. [2018-12-03 15:08:24,880 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 15:08:24,880 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 230 transitions. [2018-12-03 15:08:24,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 15:08:24,880 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:24,880 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:24,881 INFO L423 AbstractCegarLoop]: === Iteration 15 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:24,881 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:24,881 INFO L82 PathProgramCache]: Analyzing trace with hash -981870601, now seen corresponding path program 1 times [2018-12-03 15:08:24,881 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:24,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:24,882 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:24,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:24,883 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:24,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:24,995 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 15:08:24,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:24,995 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:24,995 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 15:08:24,996 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [58], [61], [65], [66] [2018-12-03 15:08:24,997 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:24,997 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:25,010 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:25,011 INFO L272 AbstractInterpreter]: Visited 10 different actions 13 times. Merged at 3 different actions 3 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:25,029 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:25,029 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:25,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:25,029 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 15:08:25,038 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:25,039 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:25,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:25,052 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:25,179 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 15:08:25,180 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:25,252 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 15:08:25,272 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:25,272 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 17 [2018-12-03 15:08:25,272 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:25,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 15:08:25,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 15:08:25,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2018-12-03 15:08:25,273 INFO L87 Difference]: Start difference. First operand 140 states and 230 transitions. Second operand 13 states. [2018-12-03 15:08:26,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:26,818 INFO L93 Difference]: Finished difference Result 239 states and 370 transitions. [2018-12-03 15:08:26,824 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 15:08:26,824 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 10 [2018-12-03 15:08:26,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:26,825 INFO L225 Difference]: With dead ends: 239 [2018-12-03 15:08:26,825 INFO L226 Difference]: Without dead ends: 237 [2018-12-03 15:08:26,827 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 584 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=1991, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 15:08:26,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2018-12-03 15:08:26,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 179. [2018-12-03 15:08:26,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-12-03 15:08:26,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 295 transitions. [2018-12-03 15:08:26,857 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 295 transitions. Word has length 10 [2018-12-03 15:08:26,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:26,857 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 295 transitions. [2018-12-03 15:08:26,857 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 15:08:26,857 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 295 transitions. [2018-12-03 15:08:26,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 15:08:26,858 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:26,858 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:26,858 INFO L423 AbstractCegarLoop]: === Iteration 16 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:26,859 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:26,859 INFO L82 PathProgramCache]: Analyzing trace with hash -981870889, now seen corresponding path program 1 times [2018-12-03 15:08:26,859 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:26,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:26,860 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:26,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:26,860 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:26,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:26,954 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:26,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:26,955 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:26,955 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 15:08:26,955 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [57], [58], [61] [2018-12-03 15:08:26,956 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:26,957 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:26,965 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:26,966 INFO L272 AbstractInterpreter]: Visited 9 different actions 10 times. Merged at 1 different actions 1 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:26,973 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:26,973 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:26,973 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:26,973 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 15:08:26,983 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:26,983 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:27,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:27,004 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:27,146 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:27,146 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:27,336 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:27,357 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:27,357 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2018-12-03 15:08:27,357 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:27,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 15:08:27,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 15:08:27,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2018-12-03 15:08:27,358 INFO L87 Difference]: Start difference. First operand 179 states and 295 transitions. Second operand 14 states. [2018-12-03 15:08:27,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:27,816 INFO L93 Difference]: Finished difference Result 221 states and 364 transitions. [2018-12-03 15:08:27,816 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 15:08:27,817 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 10 [2018-12-03 15:08:27,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:27,818 INFO L225 Difference]: With dead ends: 221 [2018-12-03 15:08:27,819 INFO L226 Difference]: Without dead ends: 219 [2018-12-03 15:08:27,820 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2018-12-03 15:08:27,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-12-03 15:08:27,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 187. [2018-12-03 15:08:27,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-12-03 15:08:27,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 309 transitions. [2018-12-03 15:08:27,852 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 309 transitions. Word has length 10 [2018-12-03 15:08:27,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:27,852 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 309 transitions. [2018-12-03 15:08:27,852 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 15:08:27,852 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 309 transitions. [2018-12-03 15:08:27,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 15:08:27,853 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:27,853 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:27,853 INFO L423 AbstractCegarLoop]: === Iteration 17 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:27,854 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:27,854 INFO L82 PathProgramCache]: Analyzing trace with hash 1101306322, now seen corresponding path program 1 times [2018-12-03 15:08:27,854 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:27,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:27,855 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:27,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:27,855 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:27,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:27,968 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 15:08:27,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:27,968 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:27,969 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 15:08:27,969 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [45], [47], [50], [56], [57] [2018-12-03 15:08:27,970 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:27,970 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:27,986 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:27,987 INFO L272 AbstractInterpreter]: Visited 10 different actions 15 times. Merged at 5 different actions 5 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:27,998 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:27,998 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:27,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:27,998 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 15:08:28,007 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:28,008 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:28,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:28,014 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:28,105 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 15:08:28,105 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:28,187 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 15:08:28,209 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:28,210 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 19 [2018-12-03 15:08:28,210 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:28,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 15:08:28,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 15:08:28,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2018-12-03 15:08:28,211 INFO L87 Difference]: Start difference. First operand 187 states and 309 transitions. Second operand 14 states. [2018-12-03 15:08:28,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:28,704 INFO L93 Difference]: Finished difference Result 198 states and 316 transitions. [2018-12-03 15:08:28,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 15:08:28,704 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 10 [2018-12-03 15:08:28,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:28,705 INFO L225 Difference]: With dead ends: 198 [2018-12-03 15:08:28,705 INFO L226 Difference]: Without dead ends: 197 [2018-12-03 15:08:28,706 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=179, Invalid=751, Unknown=0, NotChecked=0, Total=930 [2018-12-03 15:08:28,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-12-03 15:08:28,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 187. [2018-12-03 15:08:28,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-12-03 15:08:28,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 308 transitions. [2018-12-03 15:08:28,737 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 308 transitions. Word has length 10 [2018-12-03 15:08:28,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:28,737 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 308 transitions. [2018-12-03 15:08:28,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 15:08:28,738 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 308 transitions. [2018-12-03 15:08:28,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 15:08:28,738 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:28,738 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:28,739 INFO L423 AbstractCegarLoop]: === Iteration 18 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:28,739 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:28,739 INFO L82 PathProgramCache]: Analyzing trace with hash 1102106644, now seen corresponding path program 1 times [2018-12-03 15:08:28,739 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:28,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:28,740 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:28,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:28,740 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:28,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:28,839 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:28,839 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 15:08:28,839 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-12-03 15:08:28,839 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:28,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 15:08:28,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 15:08:28,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2018-12-03 15:08:28,840 INFO L87 Difference]: Start difference. First operand 187 states and 308 transitions. Second operand 8 states. [2018-12-03 15:08:29,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:29,124 INFO L93 Difference]: Finished difference Result 203 states and 321 transitions. [2018-12-03 15:08:29,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 15:08:29,124 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2018-12-03 15:08:29,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:29,126 INFO L225 Difference]: With dead ends: 203 [2018-12-03 15:08:29,126 INFO L226 Difference]: Without dead ends: 201 [2018-12-03 15:08:29,126 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=84, Invalid=222, Unknown=0, NotChecked=0, Total=306 [2018-12-03 15:08:29,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2018-12-03 15:08:29,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 188. [2018-12-03 15:08:29,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2018-12-03 15:08:29,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 309 transitions. [2018-12-03 15:08:29,154 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 309 transitions. Word has length 10 [2018-12-03 15:08:29,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:29,155 INFO L480 AbstractCegarLoop]: Abstraction has 188 states and 309 transitions. [2018-12-03 15:08:29,155 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 15:08:29,155 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 309 transitions. [2018-12-03 15:08:29,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 15:08:29,156 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:29,156 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:29,156 INFO L423 AbstractCegarLoop]: === Iteration 19 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:29,156 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:29,156 INFO L82 PathProgramCache]: Analyzing trace with hash 240543358, now seen corresponding path program 1 times [2018-12-03 15:08:29,156 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:29,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:29,157 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:29,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:29,157 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:29,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:29,345 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:29,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:29,345 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:29,345 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 13 with the following transitions: [2018-12-03 15:08:29,345 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [27], [29], [32], [65], [66] [2018-12-03 15:08:29,346 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:29,346 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:29,374 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:29,378 INFO L272 AbstractInterpreter]: Visited 10 different actions 17 times. Merged at 7 different actions 7 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:29,403 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:29,403 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:29,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:29,403 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 15:08:29,412 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:29,412 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:29,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:29,419 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:29,522 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:29,522 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:29,573 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:29,593 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:29,593 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 19 [2018-12-03 15:08:29,593 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:29,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 15:08:29,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 15:08:29,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2018-12-03 15:08:29,594 INFO L87 Difference]: Start difference. First operand 188 states and 309 transitions. Second operand 16 states. [2018-12-03 15:08:31,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:31,276 INFO L93 Difference]: Finished difference Result 410 states and 662 transitions. [2018-12-03 15:08:31,276 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 15:08:31,276 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 12 [2018-12-03 15:08:31,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:31,278 INFO L225 Difference]: With dead ends: 410 [2018-12-03 15:08:31,278 INFO L226 Difference]: Without dead ends: 408 [2018-12-03 15:08:31,279 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 777 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=707, Invalid=2155, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 15:08:31,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2018-12-03 15:08:31,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 291. [2018-12-03 15:08:31,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 291 states. [2018-12-03 15:08:31,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 488 transitions. [2018-12-03 15:08:31,343 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 488 transitions. Word has length 12 [2018-12-03 15:08:31,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:31,343 INFO L480 AbstractCegarLoop]: Abstraction has 291 states and 488 transitions. [2018-12-03 15:08:31,343 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 15:08:31,344 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 488 transitions. [2018-12-03 15:08:31,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 15:08:31,344 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:31,344 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:31,345 INFO L423 AbstractCegarLoop]: === Iteration 20 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:31,345 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:31,345 INFO L82 PathProgramCache]: Analyzing trace with hash 447688542, now seen corresponding path program 1 times [2018-12-03 15:08:31,345 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:31,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:31,346 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:31,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:31,346 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:31,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:31,556 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:31,557 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 15:08:31,557 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2018-12-03 15:08:31,557 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:31,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 15:08:31,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 15:08:31,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-12-03 15:08:31,558 INFO L87 Difference]: Start difference. First operand 291 states and 488 transitions. Second operand 10 states. [2018-12-03 15:08:31,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:31,994 INFO L93 Difference]: Finished difference Result 321 states and 535 transitions. [2018-12-03 15:08:31,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 15:08:31,995 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 12 [2018-12-03 15:08:31,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:31,996 INFO L225 Difference]: With dead ends: 321 [2018-12-03 15:08:31,996 INFO L226 Difference]: Without dead ends: 319 [2018-12-03 15:08:31,997 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=94, Invalid=286, Unknown=0, NotChecked=0, Total=380 [2018-12-03 15:08:31,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-12-03 15:08:32,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 316. [2018-12-03 15:08:32,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2018-12-03 15:08:32,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 529 transitions. [2018-12-03 15:08:32,053 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 529 transitions. Word has length 12 [2018-12-03 15:08:32,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:32,053 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 529 transitions. [2018-12-03 15:08:32,053 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 15:08:32,054 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 529 transitions. [2018-12-03 15:08:32,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 15:08:32,054 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:32,054 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:32,055 INFO L423 AbstractCegarLoop]: === Iteration 21 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:32,055 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:32,055 INFO L82 PathProgramCache]: Analyzing trace with hash 1316178012, now seen corresponding path program 1 times [2018-12-03 15:08:32,055 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:32,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:32,056 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:32,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:32,056 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:32,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:32,156 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:32,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:32,157 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:32,157 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 13 with the following transitions: [2018-12-03 15:08:32,157 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [57], [58], [63] [2018-12-03 15:08:32,158 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:32,158 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:32,170 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:32,170 INFO L272 AbstractInterpreter]: Visited 9 different actions 12 times. Merged at 3 different actions 3 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:32,177 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:32,177 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:32,177 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:32,177 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 15:08:32,185 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:32,185 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:32,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:32,207 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:32,302 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:32,303 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:32,359 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:32,379 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:32,379 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 16 [2018-12-03 15:08:32,379 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:32,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 15:08:32,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 15:08:32,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2018-12-03 15:08:32,380 INFO L87 Difference]: Start difference. First operand 316 states and 529 transitions. Second operand 14 states. [2018-12-03 15:08:33,359 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2018-12-03 15:08:34,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:34,228 INFO L93 Difference]: Finished difference Result 361 states and 604 transitions. [2018-12-03 15:08:34,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 15:08:34,228 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 12 [2018-12-03 15:08:34,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:34,230 INFO L225 Difference]: With dead ends: 361 [2018-12-03 15:08:34,230 INFO L226 Difference]: Without dead ends: 360 [2018-12-03 15:08:34,231 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=194, Invalid=508, Unknown=0, NotChecked=0, Total=702 [2018-12-03 15:08:34,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2018-12-03 15:08:34,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 309. [2018-12-03 15:08:34,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 309 states. [2018-12-03 15:08:34,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 518 transitions. [2018-12-03 15:08:34,308 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 518 transitions. Word has length 12 [2018-12-03 15:08:34,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:34,308 INFO L480 AbstractCegarLoop]: Abstraction has 309 states and 518 transitions. [2018-12-03 15:08:34,308 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 15:08:34,308 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 518 transitions. [2018-12-03 15:08:34,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 15:08:34,309 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:34,309 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:34,310 INFO L423 AbstractCegarLoop]: === Iteration 22 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:34,310 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:34,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1525011273, now seen corresponding path program 1 times [2018-12-03 15:08:34,310 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:34,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:34,311 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:34,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:34,311 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:34,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:34,765 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:34,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:34,766 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:34,766 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 13 with the following transitions: [2018-12-03 15:08:34,766 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [45], [47], [52], [56], [57] [2018-12-03 15:08:34,767 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:34,768 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:34,781 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:34,782 INFO L272 AbstractInterpreter]: Visited 10 different actions 17 times. Merged at 7 different actions 7 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:34,806 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:34,806 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:34,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:34,806 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 15:08:34,815 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:34,815 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:34,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:34,822 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:34,905 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:34,905 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:34,983 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:35,004 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:35,004 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 19 [2018-12-03 15:08:35,004 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:35,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 15:08:35,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 15:08:35,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2018-12-03 15:08:35,005 INFO L87 Difference]: Start difference. First operand 309 states and 518 transitions. Second operand 16 states. [2018-12-03 15:08:36,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:36,952 INFO L93 Difference]: Finished difference Result 612 states and 1016 transitions. [2018-12-03 15:08:36,955 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 15:08:36,956 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 12 [2018-12-03 15:08:36,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:36,959 INFO L225 Difference]: With dead ends: 612 [2018-12-03 15:08:36,960 INFO L226 Difference]: Without dead ends: 610 [2018-12-03 15:08:36,961 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 782 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=707, Invalid=2155, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 15:08:36,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2018-12-03 15:08:37,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 403. [2018-12-03 15:08:37,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 403 states. [2018-12-03 15:08:37,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 685 transitions. [2018-12-03 15:08:37,040 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 685 transitions. Word has length 12 [2018-12-03 15:08:37,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:37,040 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 685 transitions. [2018-12-03 15:08:37,040 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 15:08:37,040 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 685 transitions. [2018-12-03 15:08:37,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 15:08:37,041 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:37,041 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:37,041 INFO L423 AbstractCegarLoop]: === Iteration 23 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:37,042 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:37,042 INFO L82 PathProgramCache]: Analyzing trace with hash 1000080215, now seen corresponding path program 1 times [2018-12-03 15:08:37,042 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:37,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:37,043 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:37,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:37,043 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:37,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:37,115 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:37,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:37,115 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:37,115 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 15:08:37,116 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [27], [45], [46], [47], [50] [2018-12-03 15:08:37,117 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:37,117 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:37,145 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:37,145 INFO L272 AbstractInterpreter]: Visited 12 different actions 23 times. Merged at 9 different actions 10 times. Never widened. Found 3 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 15:08:37,155 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:37,155 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:37,155 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:37,155 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 15:08:37,164 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:37,165 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:37,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:37,171 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:37,262 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:37,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:37,306 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:37,325 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 15:08:37,325 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [8] total 16 [2018-12-03 15:08:37,325 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:37,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:08:37,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:08:37,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2018-12-03 15:08:37,326 INFO L87 Difference]: Start difference. First operand 403 states and 685 transitions. Second operand 7 states. [2018-12-03 15:08:38,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:38,164 INFO L93 Difference]: Finished difference Result 1357 states and 2283 transitions. [2018-12-03 15:08:38,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 15:08:38,164 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 15:08:38,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:38,168 INFO L225 Difference]: With dead ends: 1357 [2018-12-03 15:08:38,168 INFO L226 Difference]: Without dead ends: 956 [2018-12-03 15:08:38,170 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=137, Invalid=513, Unknown=0, NotChecked=0, Total=650 [2018-12-03 15:08:38,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 956 states. [2018-12-03 15:08:38,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 956 to 693. [2018-12-03 15:08:38,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 693 states. [2018-12-03 15:08:38,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 693 states to 693 states and 1170 transitions. [2018-12-03 15:08:38,310 INFO L78 Accepts]: Start accepts. Automaton has 693 states and 1170 transitions. Word has length 13 [2018-12-03 15:08:38,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:38,310 INFO L480 AbstractCegarLoop]: Abstraction has 693 states and 1170 transitions. [2018-12-03 15:08:38,310 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:08:38,310 INFO L276 IsEmpty]: Start isEmpty. Operand 693 states and 1170 transitions. [2018-12-03 15:08:38,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 15:08:38,311 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:38,311 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:38,312 INFO L423 AbstractCegarLoop]: === Iteration 24 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:38,312 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:38,312 INFO L82 PathProgramCache]: Analyzing trace with hash -86603521, now seen corresponding path program 1 times [2018-12-03 15:08:38,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:38,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:38,313 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:38,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:38,313 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:38,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:38,395 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 15:08:38,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:38,396 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:38,396 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 15:08:38,396 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [45], [46], [56], [58], [63], [65], [67], [70] [2018-12-03 15:08:38,398 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:38,398 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:38,410 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:38,410 INFO L272 AbstractInterpreter]: Visited 13 different actions 18 times. Merged at 4 different actions 4 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 15:08:38,422 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:38,423 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:38,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:38,423 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 15:08:38,432 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:38,432 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:38,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:38,440 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:38,548 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 15:08:38,548 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:38,615 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:38,635 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-12-03 15:08:38,635 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [7, 7] total 16 [2018-12-03 15:08:38,635 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:38,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:08:38,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:08:38,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2018-12-03 15:08:38,636 INFO L87 Difference]: Start difference. First operand 693 states and 1170 transitions. Second operand 7 states. [2018-12-03 15:08:38,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:38,956 INFO L93 Difference]: Finished difference Result 1544 states and 2592 transitions. [2018-12-03 15:08:38,963 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 15:08:38,963 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 15:08:38,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:38,967 INFO L225 Difference]: With dead ends: 1544 [2018-12-03 15:08:38,968 INFO L226 Difference]: Without dead ends: 853 [2018-12-03 15:08:38,972 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2018-12-03 15:08:38,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 853 states. [2018-12-03 15:08:39,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 853 to 748. [2018-12-03 15:08:39,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 748 states. [2018-12-03 15:08:39,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 748 states to 748 states and 1258 transitions. [2018-12-03 15:08:39,178 INFO L78 Accepts]: Start accepts. Automaton has 748 states and 1258 transitions. Word has length 13 [2018-12-03 15:08:39,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:39,178 INFO L480 AbstractCegarLoop]: Abstraction has 748 states and 1258 transitions. [2018-12-03 15:08:39,178 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:08:39,178 INFO L276 IsEmpty]: Start isEmpty. Operand 748 states and 1258 transitions. [2018-12-03 15:08:39,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 15:08:39,179 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:39,179 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:39,179 INFO L423 AbstractCegarLoop]: === Iteration 25 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:39,180 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:39,180 INFO L82 PathProgramCache]: Analyzing trace with hash -63701769, now seen corresponding path program 1 times [2018-12-03 15:08:39,180 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:39,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:39,181 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:39,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:39,181 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:39,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:39,658 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:39,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:39,658 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:39,659 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 15:08:39,659 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [21], [22], [25], [29], [32], [65], [67], [72] [2018-12-03 15:08:39,661 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:39,661 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:39,722 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:39,722 INFO L272 AbstractInterpreter]: Visited 12 different actions 29 times. Merged at 9 different actions 14 times. Widened at 1 different actions 1 times. Found 5 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 15:08:39,761 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:39,761 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:39,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:39,761 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 15:08:39,776 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:39,776 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:39,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:39,798 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:40,065 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:40,065 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:40,207 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:40,228 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-12-03 15:08:40,228 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [6, 8] total 16 [2018-12-03 15:08:40,228 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:40,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:08:40,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:08:40,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2018-12-03 15:08:40,229 INFO L87 Difference]: Start difference. First operand 748 states and 1258 transitions. Second operand 7 states. [2018-12-03 15:08:40,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:40,497 INFO L93 Difference]: Finished difference Result 1630 states and 2731 transitions. [2018-12-03 15:08:40,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 15:08:40,497 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 15:08:40,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:40,501 INFO L225 Difference]: With dead ends: 1630 [2018-12-03 15:08:40,501 INFO L226 Difference]: Without dead ends: 877 [2018-12-03 15:08:40,502 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2018-12-03 15:08:40,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 877 states. [2018-12-03 15:08:40,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 877 to 844. [2018-12-03 15:08:40,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 844 states. [2018-12-03 15:08:40,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 844 states to 844 states and 1405 transitions. [2018-12-03 15:08:40,676 INFO L78 Accepts]: Start accepts. Automaton has 844 states and 1405 transitions. Word has length 13 [2018-12-03 15:08:40,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:40,676 INFO L480 AbstractCegarLoop]: Abstraction has 844 states and 1405 transitions. [2018-12-03 15:08:40,676 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:08:40,676 INFO L276 IsEmpty]: Start isEmpty. Operand 844 states and 1405 transitions. [2018-12-03 15:08:40,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 15:08:40,677 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:40,677 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:40,678 INFO L423 AbstractCegarLoop]: === Iteration 26 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:40,678 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:40,678 INFO L82 PathProgramCache]: Analyzing trace with hash 1761298639, now seen corresponding path program 1 times [2018-12-03 15:08:40,678 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:40,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:40,679 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:40,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:40,679 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:40,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:40,858 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:40,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:40,859 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:40,859 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 15:08:40,859 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [56], [57], [58], [61], [65], [67], [70] [2018-12-03 15:08:40,860 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:40,861 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:40,889 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:40,889 INFO L272 AbstractInterpreter]: Visited 12 different actions 23 times. Merged at 7 different actions 8 times. Never widened. Found 5 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 15:08:40,916 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:40,916 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:40,916 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:40,916 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 15:08:40,924 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:40,924 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:40,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:40,946 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:41,168 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:41,169 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:41,226 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:41,254 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:41,255 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 9 [2018-12-03 15:08:41,255 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:41,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 15:08:41,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 15:08:41,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2018-12-03 15:08:41,256 INFO L87 Difference]: Start difference. First operand 844 states and 1405 transitions. Second operand 10 states. [2018-12-03 15:08:42,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:42,361 INFO L93 Difference]: Finished difference Result 974 states and 1593 transitions. [2018-12-03 15:08:42,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 15:08:42,361 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2018-12-03 15:08:42,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:42,365 INFO L225 Difference]: With dead ends: 974 [2018-12-03 15:08:42,365 INFO L226 Difference]: Without dead ends: 972 [2018-12-03 15:08:42,367 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=147, Invalid=555, Unknown=0, NotChecked=0, Total=702 [2018-12-03 15:08:42,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 972 states. [2018-12-03 15:08:42,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 972 to 861. [2018-12-03 15:08:42,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 861 states. [2018-12-03 15:08:42,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 861 states to 861 states and 1430 transitions. [2018-12-03 15:08:42,567 INFO L78 Accepts]: Start accepts. Automaton has 861 states and 1430 transitions. Word has length 13 [2018-12-03 15:08:42,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:42,568 INFO L480 AbstractCegarLoop]: Abstraction has 861 states and 1430 transitions. [2018-12-03 15:08:42,568 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 15:08:42,568 INFO L276 IsEmpty]: Start isEmpty. Operand 861 states and 1430 transitions. [2018-12-03 15:08:42,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 15:08:42,568 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:42,569 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:42,569 INFO L423 AbstractCegarLoop]: === Iteration 27 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:42,569 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:42,569 INFO L82 PathProgramCache]: Analyzing trace with hash 1799471129, now seen corresponding path program 1 times [2018-12-03 15:08:42,569 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:42,570 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:42,570 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:42,570 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:42,570 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:42,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:42,658 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:42,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:42,658 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:42,659 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 15:08:42,659 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [45], [46], [47], [50], [56], [58], [63] [2018-12-03 15:08:42,660 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:42,660 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:42,666 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:42,666 INFO L272 AbstractInterpreter]: Visited 12 different actions 13 times. Merged at 1 different actions 1 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:42,668 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:42,668 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:42,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:42,668 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 15:08:42,681 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:42,681 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:42,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:42,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:42,800 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:42,801 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:42,866 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:42,886 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 15:08:42,886 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [8] total 17 [2018-12-03 15:08:42,886 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:42,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:08:42,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:08:42,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2018-12-03 15:08:42,887 INFO L87 Difference]: Start difference. First operand 861 states and 1430 transitions. Second operand 7 states. [2018-12-03 15:08:43,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:43,397 INFO L93 Difference]: Finished difference Result 2016 states and 3328 transitions. [2018-12-03 15:08:43,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 15:08:43,398 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 15:08:43,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:43,402 INFO L225 Difference]: With dead ends: 2016 [2018-12-03 15:08:43,402 INFO L226 Difference]: Without dead ends: 1157 [2018-12-03 15:08:43,404 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2018-12-03 15:08:43,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1157 states. [2018-12-03 15:08:43,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1157 to 932. [2018-12-03 15:08:43,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 932 states. [2018-12-03 15:08:43,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 932 states to 932 states and 1549 transitions. [2018-12-03 15:08:43,585 INFO L78 Accepts]: Start accepts. Automaton has 932 states and 1549 transitions. Word has length 13 [2018-12-03 15:08:43,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:43,585 INFO L480 AbstractCegarLoop]: Abstraction has 932 states and 1549 transitions. [2018-12-03 15:08:43,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:08:43,585 INFO L276 IsEmpty]: Start isEmpty. Operand 932 states and 1549 transitions. [2018-12-03 15:08:43,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 15:08:43,586 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:43,586 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:43,586 INFO L423 AbstractCegarLoop]: === Iteration 28 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:43,587 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:43,587 INFO L82 PathProgramCache]: Analyzing trace with hash 267374077, now seen corresponding path program 1 times [2018-12-03 15:08:43,587 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:43,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:43,587 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:43,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:43,588 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:43,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:43,656 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:43,656 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:43,656 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:43,656 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 15:08:43,657 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [58], [61], [65], [66], [67], [70] [2018-12-03 15:08:43,658 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:43,658 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:43,671 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:43,671 INFO L272 AbstractInterpreter]: Visited 12 different actions 23 times. Merged at 7 different actions 8 times. Never widened. Found 5 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 15:08:43,679 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:43,679 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:43,679 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:43,679 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 15:08:43,688 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:43,689 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:43,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:43,694 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:43,722 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:43,722 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:43,767 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:43,786 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:43,786 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 9 [2018-12-03 15:08:43,786 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:43,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 15:08:43,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 15:08:43,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2018-12-03 15:08:43,787 INFO L87 Difference]: Start difference. First operand 932 states and 1549 transitions. Second operand 10 states. [2018-12-03 15:08:44,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:44,536 INFO L93 Difference]: Finished difference Result 1072 states and 1761 transitions. [2018-12-03 15:08:44,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 15:08:44,536 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2018-12-03 15:08:44,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:44,540 INFO L225 Difference]: With dead ends: 1072 [2018-12-03 15:08:44,540 INFO L226 Difference]: Without dead ends: 1070 [2018-12-03 15:08:44,541 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=147, Invalid=555, Unknown=0, NotChecked=0, Total=702 [2018-12-03 15:08:44,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1070 states. [2018-12-03 15:08:44,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1070 to 930. [2018-12-03 15:08:44,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 930 states. [2018-12-03 15:08:44,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 930 states to 930 states and 1547 transitions. [2018-12-03 15:08:44,741 INFO L78 Accepts]: Start accepts. Automaton has 930 states and 1547 transitions. Word has length 13 [2018-12-03 15:08:44,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:44,741 INFO L480 AbstractCegarLoop]: Abstraction has 930 states and 1547 transitions. [2018-12-03 15:08:44,741 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 15:08:44,742 INFO L276 IsEmpty]: Start isEmpty. Operand 930 states and 1547 transitions. [2018-12-03 15:08:44,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 15:08:44,743 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:44,743 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:44,743 INFO L423 AbstractCegarLoop]: === Iteration 29 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:44,743 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:44,743 INFO L82 PathProgramCache]: Analyzing trace with hash 290277111, now seen corresponding path program 1 times [2018-12-03 15:08:44,744 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:44,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:44,745 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:44,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:44,745 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:44,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:45,493 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:45,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:45,493 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:45,494 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 15:08:45,494 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [22], [25], [38], [41], [65], [67], [72] [2018-12-03 15:08:45,495 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:45,495 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:45,503 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:45,503 INFO L272 AbstractInterpreter]: Visited 12 different actions 13 times. Merged at 1 different actions 1 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:45,519 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:45,519 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:45,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:45,519 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 15:08:45,528 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:45,528 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:45,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:45,535 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:45,863 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:45,863 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:46,281 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:46,300 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 15:08:46,301 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [8] total 17 [2018-12-03 15:08:46,301 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:46,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:08:46,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:08:46,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2018-12-03 15:08:46,301 INFO L87 Difference]: Start difference. First operand 930 states and 1547 transitions. Second operand 7 states. [2018-12-03 15:08:46,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:46,893 INFO L93 Difference]: Finished difference Result 2178 states and 3577 transitions. [2018-12-03 15:08:46,893 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 15:08:46,893 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 15:08:46,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:46,898 INFO L225 Difference]: With dead ends: 2178 [2018-12-03 15:08:46,898 INFO L226 Difference]: Without dead ends: 1241 [2018-12-03 15:08:46,899 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2018-12-03 15:08:46,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1241 states. [2018-12-03 15:08:47,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1241 to 979. [2018-12-03 15:08:47,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 979 states. [2018-12-03 15:08:47,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 979 states to 979 states and 1621 transitions. [2018-12-03 15:08:47,102 INFO L78 Accepts]: Start accepts. Automaton has 979 states and 1621 transitions. Word has length 13 [2018-12-03 15:08:47,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:47,102 INFO L480 AbstractCegarLoop]: Abstraction has 979 states and 1621 transitions. [2018-12-03 15:08:47,102 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:08:47,102 INFO L276 IsEmpty]: Start isEmpty. Operand 979 states and 1621 transitions. [2018-12-03 15:08:47,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 15:08:47,103 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:47,103 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:47,103 INFO L423 AbstractCegarLoop]: === Iteration 30 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:47,103 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:47,104 INFO L82 PathProgramCache]: Analyzing trace with hash 2115278289, now seen corresponding path program 1 times [2018-12-03 15:08:47,104 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:47,104 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:47,105 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:47,105 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:47,105 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:47,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:47,310 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 15:08:47,311 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:47,311 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:47,311 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 15:08:47,311 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [38], [41], [56], [58], [61], [65], [67], [72] [2018-12-03 15:08:47,312 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:47,312 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:47,321 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:47,321 INFO L272 AbstractInterpreter]: Visited 13 different actions 18 times. Merged at 4 different actions 4 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 15:08:47,346 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:47,346 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:47,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:47,346 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 15:08:47,355 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:47,355 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:47,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:47,361 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:47,446 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 15:08:47,446 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:47,523 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:47,541 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-12-03 15:08:47,541 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [7, 7] total 16 [2018-12-03 15:08:47,541 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:47,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:08:47,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:08:47,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2018-12-03 15:08:47,542 INFO L87 Difference]: Start difference. First operand 979 states and 1621 transitions. Second operand 7 states. [2018-12-03 15:08:47,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:47,994 INFO L93 Difference]: Finished difference Result 2106 states and 3472 transitions. [2018-12-03 15:08:47,994 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 15:08:47,994 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 15:08:47,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:47,998 INFO L225 Difference]: With dead ends: 2106 [2018-12-03 15:08:47,998 INFO L226 Difference]: Without dead ends: 1115 [2018-12-03 15:08:48,000 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2018-12-03 15:08:48,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1115 states. [2018-12-03 15:08:48,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1115 to 1011. [2018-12-03 15:08:48,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1011 states. [2018-12-03 15:08:48,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1011 states to 1011 states and 1656 transitions. [2018-12-03 15:08:48,195 INFO L78 Accepts]: Start accepts. Automaton has 1011 states and 1656 transitions. Word has length 13 [2018-12-03 15:08:48,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:48,196 INFO L480 AbstractCegarLoop]: Abstraction has 1011 states and 1656 transitions. [2018-12-03 15:08:48,196 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:08:48,196 INFO L276 IsEmpty]: Start isEmpty. Operand 1011 states and 1656 transitions. [2018-12-03 15:08:48,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 15:08:48,196 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:48,196 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:48,197 INFO L423 AbstractCegarLoop]: === Iteration 31 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:48,197 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:48,197 INFO L82 PathProgramCache]: Analyzing trace with hash -2141517287, now seen corresponding path program 1 times [2018-12-03 15:08:48,197 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:48,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:48,198 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:48,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:48,198 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:48,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:48,254 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:48,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:48,254 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:48,254 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 15:08:48,255 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [45], [46], [47], [50], [56], [58], [63] [2018-12-03 15:08:48,255 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:48,256 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:48,274 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:48,275 INFO L272 AbstractInterpreter]: Visited 12 different actions 29 times. Merged at 9 different actions 14 times. Widened at 1 different actions 1 times. Found 5 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 15:08:48,289 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:48,290 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:48,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:48,290 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 15:08:48,297 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:48,298 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:48,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:48,305 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:48,388 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:48,389 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:48,447 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:48,468 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-12-03 15:08:48,468 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [6, 7] total 15 [2018-12-03 15:08:48,468 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:48,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:08:48,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:08:48,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2018-12-03 15:08:48,469 INFO L87 Difference]: Start difference. First operand 1011 states and 1656 transitions. Second operand 7 states. [2018-12-03 15:08:48,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:48,805 INFO L93 Difference]: Finished difference Result 1334 states and 2144 transitions. [2018-12-03 15:08:48,805 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 15:08:48,805 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 15:08:48,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:48,809 INFO L225 Difference]: With dead ends: 1334 [2018-12-03 15:08:48,809 INFO L226 Difference]: Without dead ends: 1056 [2018-12-03 15:08:48,809 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2018-12-03 15:08:48,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1056 states. [2018-12-03 15:08:49,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1056 to 929. [2018-12-03 15:08:49,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 929 states. [2018-12-03 15:08:49,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 929 states to 929 states and 1514 transitions. [2018-12-03 15:08:49,003 INFO L78 Accepts]: Start accepts. Automaton has 929 states and 1514 transitions. Word has length 13 [2018-12-03 15:08:49,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:49,004 INFO L480 AbstractCegarLoop]: Abstraction has 929 states and 1514 transitions. [2018-12-03 15:08:49,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:08:49,004 INFO L276 IsEmpty]: Start isEmpty. Operand 929 states and 1514 transitions. [2018-12-03 15:08:49,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 15:08:49,004 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:49,004 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:49,005 INFO L423 AbstractCegarLoop]: === Iteration 32 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:49,005 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:49,005 INFO L82 PathProgramCache]: Analyzing trace with hash 2129075237, now seen corresponding path program 1 times [2018-12-03 15:08:49,005 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:49,006 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:49,006 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:49,006 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:49,006 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:49,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:49,119 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:49,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:49,119 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:49,119 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 15:08:49,119 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [45], [47], [52] [2018-12-03 15:08:49,120 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:49,120 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:49,133 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:49,133 INFO L272 AbstractInterpreter]: Visited 12 different actions 23 times. Merged at 9 different actions 10 times. Never widened. Found 3 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 15:08:49,160 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:49,160 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:49,160 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:49,160 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 15:08:49,175 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:49,176 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:49,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:49,188 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:49,271 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:49,271 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:49,312 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:49,332 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 15:08:49,332 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [8] total 16 [2018-12-03 15:08:49,332 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:49,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:08:49,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:08:49,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2018-12-03 15:08:49,333 INFO L87 Difference]: Start difference. First operand 929 states and 1514 transitions. Second operand 7 states. [2018-12-03 15:08:50,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:50,056 INFO L93 Difference]: Finished difference Result 2558 states and 4101 transitions. [2018-12-03 15:08:50,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 15:08:50,056 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 15:08:50,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:50,063 INFO L225 Difference]: With dead ends: 2558 [2018-12-03 15:08:50,063 INFO L226 Difference]: Without dead ends: 1617 [2018-12-03 15:08:50,065 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=137, Invalid=513, Unknown=0, NotChecked=0, Total=650 [2018-12-03 15:08:50,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1617 states. [2018-12-03 15:08:50,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1617 to 1096. [2018-12-03 15:08:50,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1096 states. [2018-12-03 15:08:50,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1096 states to 1096 states and 1771 transitions. [2018-12-03 15:08:50,306 INFO L78 Accepts]: Start accepts. Automaton has 1096 states and 1771 transitions. Word has length 13 [2018-12-03 15:08:50,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:50,307 INFO L480 AbstractCegarLoop]: Abstraction has 1096 states and 1771 transitions. [2018-12-03 15:08:50,307 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:08:50,307 INFO L276 IsEmpty]: Start isEmpty. Operand 1096 states and 1771 transitions. [2018-12-03 15:08:50,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-12-03 15:08:50,307 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:50,308 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:50,308 INFO L423 AbstractCegarLoop]: === Iteration 33 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:50,308 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:50,308 INFO L82 PathProgramCache]: Analyzing trace with hash -1374164806, now seen corresponding path program 1 times [2018-12-03 15:08:50,308 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:50,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:50,309 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:50,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:50,309 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:50,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:50,449 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:50,449 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:50,450 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:50,450 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-12-03 15:08:50,450 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [45], [46], [56], [58], [63], [65], [67], [72] [2018-12-03 15:08:50,451 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:50,451 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:50,459 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:50,460 INFO L272 AbstractInterpreter]: Visited 13 different actions 20 times. Merged at 6 different actions 6 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 15:08:50,503 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:50,503 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:50,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:50,504 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 15:08:50,517 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:50,517 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:50,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:50,536 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:50,598 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:50,598 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:50,661 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:50,680 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:50,680 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6, 6] total 19 [2018-12-03 15:08:50,680 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:50,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 15:08:50,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 15:08:50,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=324, Unknown=0, NotChecked=0, Total=380 [2018-12-03 15:08:50,681 INFO L87 Difference]: Start difference. First operand 1096 states and 1771 transitions. Second operand 15 states. [2018-12-03 15:08:52,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:52,316 INFO L93 Difference]: Finished difference Result 1259 states and 2012 transitions. [2018-12-03 15:08:52,316 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 15:08:52,316 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 15 [2018-12-03 15:08:52,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:52,321 INFO L225 Difference]: With dead ends: 1259 [2018-12-03 15:08:52,321 INFO L226 Difference]: Without dead ends: 1257 [2018-12-03 15:08:52,322 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=331, Invalid=1391, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 15:08:52,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1257 states. [2018-12-03 15:08:52,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1257 to 1090. [2018-12-03 15:08:52,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1090 states. [2018-12-03 15:08:52,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1090 states to 1090 states and 1756 transitions. [2018-12-03 15:08:52,563 INFO L78 Accepts]: Start accepts. Automaton has 1090 states and 1756 transitions. Word has length 15 [2018-12-03 15:08:52,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:52,563 INFO L480 AbstractCegarLoop]: Abstraction has 1090 states and 1756 transitions. [2018-12-03 15:08:52,563 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 15:08:52,563 INFO L276 IsEmpty]: Start isEmpty. Operand 1090 states and 1756 transitions. [2018-12-03 15:08:52,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-12-03 15:08:52,564 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:52,564 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:52,564 INFO L423 AbstractCegarLoop]: === Iteration 34 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:52,564 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:52,565 INFO L82 PathProgramCache]: Analyzing trace with hash 1511389740, now seen corresponding path program 1 times [2018-12-03 15:08:52,565 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:52,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:52,565 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:52,566 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:52,566 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:52,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:52,709 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:52,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:52,709 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:52,710 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-12-03 15:08:52,710 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [38], [41], [56], [58], [63], [65], [67], [72] [2018-12-03 15:08:52,711 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:52,711 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:52,720 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:52,721 INFO L272 AbstractInterpreter]: Visited 13 different actions 20 times. Merged at 6 different actions 6 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 15:08:52,743 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:52,743 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:52,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:52,743 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 15:08:52,752 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:52,752 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:52,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:52,759 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:52,817 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:52,817 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:53,306 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:53,324 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:53,324 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 16 [2018-12-03 15:08:53,325 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:53,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 15:08:53,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 15:08:53,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2018-12-03 15:08:53,325 INFO L87 Difference]: Start difference. First operand 1090 states and 1756 transitions. Second operand 12 states. [2018-12-03 15:08:54,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:54,388 INFO L93 Difference]: Finished difference Result 1232 states and 1960 transitions. [2018-12-03 15:08:54,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 15:08:54,388 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 15 [2018-12-03 15:08:54,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:54,393 INFO L225 Difference]: With dead ends: 1232 [2018-12-03 15:08:54,393 INFO L226 Difference]: Without dead ends: 1230 [2018-12-03 15:08:54,393 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=186, Invalid=744, Unknown=0, NotChecked=0, Total=930 [2018-12-03 15:08:54,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1230 states. [2018-12-03 15:08:54,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1230 to 1086. [2018-12-03 15:08:54,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1086 states. [2018-12-03 15:08:54,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1086 states to 1086 states and 1745 transitions. [2018-12-03 15:08:54,687 INFO L78 Accepts]: Start accepts. Automaton has 1086 states and 1745 transitions. Word has length 15 [2018-12-03 15:08:54,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:54,688 INFO L480 AbstractCegarLoop]: Abstraction has 1086 states and 1745 transitions. [2018-12-03 15:08:54,688 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 15:08:54,688 INFO L276 IsEmpty]: Start isEmpty. Operand 1086 states and 1745 transitions. [2018-12-03 15:08:54,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 15:08:54,689 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:54,689 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:54,689 INFO L423 AbstractCegarLoop]: === Iteration 35 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:54,689 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:54,690 INFO L82 PathProgramCache]: Analyzing trace with hash -474679190, now seen corresponding path program 1 times [2018-12-03 15:08:54,690 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:54,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:54,690 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:54,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:54,691 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:54,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:54,783 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:54,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:54,783 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:54,783 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 15:08:54,783 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [25], [27], [45], [46], [47], [50] [2018-12-03 15:08:54,784 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:54,784 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:54,795 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:54,795 INFO L272 AbstractInterpreter]: Visited 13 different actions 24 times. Merged at 9 different actions 10 times. Never widened. Found 4 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 15:08:54,818 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:54,818 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:54,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:54,818 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 15:08:54,828 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:54,828 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:54,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:54,836 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:54,866 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:54,867 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:54,918 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:54,937 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:54,937 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 15 [2018-12-03 15:08:54,937 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:54,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 15:08:54,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 15:08:54,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2018-12-03 15:08:54,938 INFO L87 Difference]: Start difference. First operand 1086 states and 1745 transitions. Second operand 11 states. [2018-12-03 15:08:55,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:55,693 INFO L93 Difference]: Finished difference Result 1212 states and 1935 transitions. [2018-12-03 15:08:55,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 15:08:55,694 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 15:08:55,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:55,698 INFO L225 Difference]: With dead ends: 1212 [2018-12-03 15:08:55,698 INFO L226 Difference]: Without dead ends: 1210 [2018-12-03 15:08:55,699 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=160, Invalid=490, Unknown=0, NotChecked=0, Total=650 [2018-12-03 15:08:55,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1210 states. [2018-12-03 15:08:55,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1210 to 1087. [2018-12-03 15:08:55,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1087 states. [2018-12-03 15:08:55,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1087 states to 1087 states and 1746 transitions. [2018-12-03 15:08:55,954 INFO L78 Accepts]: Start accepts. Automaton has 1087 states and 1746 transitions. Word has length 16 [2018-12-03 15:08:55,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:55,954 INFO L480 AbstractCegarLoop]: Abstraction has 1087 states and 1746 transitions. [2018-12-03 15:08:55,954 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 15:08:55,954 INFO L276 IsEmpty]: Start isEmpty. Operand 1087 states and 1746 transitions. [2018-12-03 15:08:55,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 15:08:55,955 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:55,955 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:55,955 INFO L423 AbstractCegarLoop]: === Iteration 36 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:55,955 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:55,956 INFO L82 PathProgramCache]: Analyzing trace with hash -1561364496, now seen corresponding path program 1 times [2018-12-03 15:08:55,956 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:55,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:55,957 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:55,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:55,957 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:55,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:56,047 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:08:56,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:56,048 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:56,048 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 15:08:56,048 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [25], [29], [32], [56], [57], [58], [61], [65], [67], [70] [2018-12-03 15:08:56,049 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:56,049 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:56,061 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:56,062 INFO L272 AbstractInterpreter]: Visited 15 different actions 29 times. Merged at 9 different actions 10 times. Never widened. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 15:08:56,099 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:56,099 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:56,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:56,099 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 15:08:56,111 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:56,112 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:56,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:56,119 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:56,171 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:08:56,171 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:56,200 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:08:56,219 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:56,219 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-12-03 15:08:56,219 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:56,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 15:08:56,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 15:08:56,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2018-12-03 15:08:56,220 INFO L87 Difference]: Start difference. First operand 1087 states and 1746 transitions. Second operand 11 states. [2018-12-03 15:08:57,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:57,449 INFO L93 Difference]: Finished difference Result 1275 states and 2024 transitions. [2018-12-03 15:08:57,449 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-03 15:08:57,449 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 15:08:57,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:57,454 INFO L225 Difference]: With dead ends: 1275 [2018-12-03 15:08:57,454 INFO L226 Difference]: Without dead ends: 1272 [2018-12-03 15:08:57,455 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 22 SyntacticMatches, 5 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=211, Invalid=781, Unknown=0, NotChecked=0, Total=992 [2018-12-03 15:08:57,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1272 states. [2018-12-03 15:08:57,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1272 to 1110. [2018-12-03 15:08:57,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1110 states. [2018-12-03 15:08:57,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1110 states to 1110 states and 1779 transitions. [2018-12-03 15:08:57,714 INFO L78 Accepts]: Start accepts. Automaton has 1110 states and 1779 transitions. Word has length 16 [2018-12-03 15:08:57,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:57,714 INFO L480 AbstractCegarLoop]: Abstraction has 1110 states and 1779 transitions. [2018-12-03 15:08:57,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 15:08:57,715 INFO L276 IsEmpty]: Start isEmpty. Operand 1110 states and 1779 transitions. [2018-12-03 15:08:57,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 15:08:57,715 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:57,715 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:57,716 INFO L423 AbstractCegarLoop]: === Iteration 37 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:57,716 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:57,716 INFO L82 PathProgramCache]: Analyzing trace with hash 324711724, now seen corresponding path program 1 times [2018-12-03 15:08:57,716 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:57,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:57,717 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:57,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:57,717 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:57,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:57,798 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:57,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:57,798 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:57,799 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 15:08:57,799 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [25], [29], [32], [45], [46], [47], [50], [56], [58], [63] [2018-12-03 15:08:57,799 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:57,799 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:57,806 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:57,806 INFO L272 AbstractInterpreter]: Visited 15 different actions 20 times. Merged at 4 different actions 4 times. Never widened. Found 3 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 15:08:57,826 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:57,826 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:57,826 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:57,826 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 15:08:57,835 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:57,835 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:57,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:57,840 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:57,875 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:57,875 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:57,927 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:57,947 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:57,947 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 16 [2018-12-03 15:08:57,947 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:57,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 15:08:57,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 15:08:57,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2018-12-03 15:08:57,948 INFO L87 Difference]: Start difference. First operand 1110 states and 1779 transitions. Second operand 12 states. [2018-12-03 15:08:58,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:58,979 INFO L93 Difference]: Finished difference Result 1317 states and 2102 transitions. [2018-12-03 15:08:58,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 15:08:58,979 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 16 [2018-12-03 15:08:58,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:58,985 INFO L225 Difference]: With dead ends: 1317 [2018-12-03 15:08:58,985 INFO L226 Difference]: Without dead ends: 1315 [2018-12-03 15:08:58,986 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=738, Unknown=0, NotChecked=0, Total=930 [2018-12-03 15:08:58,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1315 states. [2018-12-03 15:08:59,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1315 to 1128. [2018-12-03 15:08:59,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1128 states. [2018-12-03 15:08:59,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1128 states to 1128 states and 1809 transitions. [2018-12-03 15:08:59,248 INFO L78 Accepts]: Start accepts. Automaton has 1128 states and 1809 transitions. Word has length 16 [2018-12-03 15:08:59,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:59,248 INFO L480 AbstractCegarLoop]: Abstraction has 1128 states and 1809 transitions. [2018-12-03 15:08:59,248 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 15:08:59,248 INFO L276 IsEmpty]: Start isEmpty. Operand 1128 states and 1809 transitions. [2018-12-03 15:08:59,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 15:08:59,250 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:59,250 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:08:59,250 INFO L423 AbstractCegarLoop]: === Iteration 38 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:59,250 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:59,250 INFO L82 PathProgramCache]: Analyzing trace with hash -767609008, now seen corresponding path program 1 times [2018-12-03 15:08:59,250 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:59,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:59,251 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:59,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:59,251 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:59,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:59,650 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:59,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:59,650 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:59,650 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 15:08:59,651 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [45], [46], [56], [58], [61], [63], [65], [67], [70] [2018-12-03 15:08:59,651 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:59,651 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:59,667 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:59,667 INFO L272 AbstractInterpreter]: Visited 14 different actions 26 times. Merged at 7 different actions 8 times. Never widened. Found 6 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 15:08:59,700 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:59,701 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:59,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:59,701 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 15:08:59,712 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:59,712 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:59,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:59,731 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:59,871 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:59,871 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:59,926 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:59,945 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:59,945 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2018-12-03 15:08:59,945 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:59,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 15:08:59,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 15:08:59,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2018-12-03 15:08:59,946 INFO L87 Difference]: Start difference. First operand 1128 states and 1809 transitions. Second operand 11 states. [2018-12-03 15:09:00,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:00,806 INFO L93 Difference]: Finished difference Result 1251 states and 1991 transitions. [2018-12-03 15:09:00,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 15:09:00,807 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 15:09:00,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:00,811 INFO L225 Difference]: With dead ends: 1251 [2018-12-03 15:09:00,811 INFO L226 Difference]: Without dead ends: 1249 [2018-12-03 15:09:00,812 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2018-12-03 15:09:00,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1249 states. [2018-12-03 15:09:01,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1249 to 1119. [2018-12-03 15:09:01,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1119 states. [2018-12-03 15:09:01,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1119 states to 1119 states and 1794 transitions. [2018-12-03 15:09:01,078 INFO L78 Accepts]: Start accepts. Automaton has 1119 states and 1794 transitions. Word has length 16 [2018-12-03 15:09:01,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:01,078 INFO L480 AbstractCegarLoop]: Abstraction has 1119 states and 1794 transitions. [2018-12-03 15:09:01,079 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 15:09:01,079 INFO L276 IsEmpty]: Start isEmpty. Operand 1119 states and 1794 transitions. [2018-12-03 15:09:01,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 15:09:01,080 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:01,080 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:01,080 INFO L423 AbstractCegarLoop]: === Iteration 39 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:01,080 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:01,080 INFO L82 PathProgramCache]: Analyzing trace with hash 646859569, now seen corresponding path program 1 times [2018-12-03 15:09:01,081 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:01,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:01,081 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:01,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:01,082 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:01,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:01,151 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:01,152 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:01,152 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:01,152 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 15:09:01,152 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [22], [25], [38], [41], [65], [67], [70], [72] [2018-12-03 15:09:01,153 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:01,153 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:01,158 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:01,158 INFO L272 AbstractInterpreter]: Visited 13 different actions 15 times. Merged at 2 different actions 2 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 15:09:01,198 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:01,198 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:01,198 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:01,198 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 15:09:01,212 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:01,212 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:01,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:01,218 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:01,239 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:01,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:01,299 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:01,317 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:01,317 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 16 [2018-12-03 15:09:01,317 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:01,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 15:09:01,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 15:09:01,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2018-12-03 15:09:01,318 INFO L87 Difference]: Start difference. First operand 1119 states and 1794 transitions. Second operand 12 states. [2018-12-03 15:09:02,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:02,406 INFO L93 Difference]: Finished difference Result 1242 states and 1971 transitions. [2018-12-03 15:09:02,407 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 15:09:02,407 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 16 [2018-12-03 15:09:02,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:02,412 INFO L225 Difference]: With dead ends: 1242 [2018-12-03 15:09:02,412 INFO L226 Difference]: Without dead ends: 1240 [2018-12-03 15:09:02,413 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=182, Invalid=688, Unknown=0, NotChecked=0, Total=870 [2018-12-03 15:09:02,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1240 states. [2018-12-03 15:09:02,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1240 to 1137. [2018-12-03 15:09:02,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1137 states. [2018-12-03 15:09:02,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1137 states to 1137 states and 1825 transitions. [2018-12-03 15:09:02,684 INFO L78 Accepts]: Start accepts. Automaton has 1137 states and 1825 transitions. Word has length 16 [2018-12-03 15:09:02,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:02,684 INFO L480 AbstractCegarLoop]: Abstraction has 1137 states and 1825 transitions. [2018-12-03 15:09:02,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 15:09:02,685 INFO L276 IsEmpty]: Start isEmpty. Operand 1137 states and 1825 transitions. [2018-12-03 15:09:02,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 15:09:02,685 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:02,685 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:02,686 INFO L423 AbstractCegarLoop]: === Iteration 40 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:02,686 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:02,686 INFO L82 PathProgramCache]: Analyzing trace with hash -1823107031, now seen corresponding path program 2 times [2018-12-03 15:09:02,686 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:02,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:02,687 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:02,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:02,687 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:02,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:02,772 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:09:02,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:02,772 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:02,772 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:02,772 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:02,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:02,773 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 15:09:02,782 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:09:02,783 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:09:02,790 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 15:09:02,790 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:09:02,792 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:02,832 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:09:02,832 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:02,865 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:09:02,883 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:02,883 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-12-03 15:09:02,883 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:02,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 15:09:02,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 15:09:02,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2018-12-03 15:09:02,884 INFO L87 Difference]: Start difference. First operand 1137 states and 1825 transitions. Second operand 11 states. [2018-12-03 15:09:03,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:03,934 INFO L93 Difference]: Finished difference Result 1321 states and 2096 transitions. [2018-12-03 15:09:03,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-03 15:09:03,934 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 15:09:03,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:03,939 INFO L225 Difference]: With dead ends: 1321 [2018-12-03 15:09:03,939 INFO L226 Difference]: Without dead ends: 1318 [2018-12-03 15:09:03,940 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 22 SyntacticMatches, 5 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=781, Unknown=0, NotChecked=0, Total=992 [2018-12-03 15:09:03,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1318 states. [2018-12-03 15:09:04,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1318 to 1159. [2018-12-03 15:09:04,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1159 states. [2018-12-03 15:09:04,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1159 states to 1159 states and 1857 transitions. [2018-12-03 15:09:04,224 INFO L78 Accepts]: Start accepts. Automaton has 1159 states and 1857 transitions. Word has length 16 [2018-12-03 15:09:04,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:04,224 INFO L480 AbstractCegarLoop]: Abstraction has 1159 states and 1857 transitions. [2018-12-03 15:09:04,224 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 15:09:04,224 INFO L276 IsEmpty]: Start isEmpty. Operand 1159 states and 1857 transitions. [2018-12-03 15:09:04,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 15:09:04,225 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:04,225 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:04,226 INFO L423 AbstractCegarLoop]: === Iteration 41 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:04,226 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:04,226 INFO L82 PathProgramCache]: Analyzing trace with hash -1823106549, now seen corresponding path program 1 times [2018-12-03 15:09:04,226 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:04,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:04,227 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:09:04,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:04,227 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:04,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:04,314 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:04,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:04,315 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:04,315 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 15:09:04,315 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [38], [41], [56], [58], [61], [65], [67], [70], [72] [2018-12-03 15:09:04,316 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:04,317 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:04,326 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:04,326 INFO L272 AbstractInterpreter]: Visited 14 different actions 26 times. Merged at 7 different actions 8 times. Never widened. Found 6 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 15:09:04,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:04,361 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:04,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:04,361 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 15:09:04,378 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:04,379 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:04,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:04,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:04,448 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:04,449 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:04,498 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:04,518 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:04,518 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2018-12-03 15:09:04,518 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:04,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 15:09:04,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 15:09:04,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2018-12-03 15:09:04,519 INFO L87 Difference]: Start difference. First operand 1159 states and 1857 transitions. Second operand 11 states. [2018-12-03 15:09:05,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:05,399 INFO L93 Difference]: Finished difference Result 1262 states and 2003 transitions. [2018-12-03 15:09:05,399 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 15:09:05,399 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 15:09:05,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:05,402 INFO L225 Difference]: With dead ends: 1262 [2018-12-03 15:09:05,402 INFO L226 Difference]: Without dead ends: 1260 [2018-12-03 15:09:05,405 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2018-12-03 15:09:05,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1260 states. [2018-12-03 15:09:05,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1260 to 1163. [2018-12-03 15:09:05,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1163 states. [2018-12-03 15:09:05,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1163 states to 1163 states and 1864 transitions. [2018-12-03 15:09:05,684 INFO L78 Accepts]: Start accepts. Automaton has 1163 states and 1864 transitions. Word has length 16 [2018-12-03 15:09:05,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:05,684 INFO L480 AbstractCegarLoop]: Abstraction has 1163 states and 1864 transitions. [2018-12-03 15:09:05,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 15:09:05,684 INFO L276 IsEmpty]: Start isEmpty. Operand 1163 states and 1864 transitions. [2018-12-03 15:09:05,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 15:09:05,685 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:05,685 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:05,685 INFO L423 AbstractCegarLoop]: === Iteration 42 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:05,685 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:05,685 INFO L82 PathProgramCache]: Analyzing trace with hash -1462469629, now seen corresponding path program 1 times [2018-12-03 15:09:05,685 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:05,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:05,686 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:05,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:05,686 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:05,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:05,761 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:05,762 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:05,762 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:05,762 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 15:09:05,762 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [22], [25], [38], [41], [45], [47], [50], [65], [67], [72] [2018-12-03 15:09:05,763 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:05,763 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:05,770 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:05,770 INFO L272 AbstractInterpreter]: Visited 15 different actions 20 times. Merged at 4 different actions 4 times. Never widened. Found 3 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 15:09:05,809 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:05,809 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:05,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:05,809 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 15:09:05,822 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:05,823 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:05,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:05,829 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:05,858 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:05,858 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:05,914 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:05,934 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:05,934 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 16 [2018-12-03 15:09:05,934 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:05,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 15:09:05,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 15:09:05,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2018-12-03 15:09:05,935 INFO L87 Difference]: Start difference. First operand 1163 states and 1864 transitions. Second operand 12 states. [2018-12-03 15:09:07,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:07,045 INFO L93 Difference]: Finished difference Result 1353 states and 2154 transitions. [2018-12-03 15:09:07,045 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 15:09:07,045 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 16 [2018-12-03 15:09:07,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:07,047 INFO L225 Difference]: With dead ends: 1353 [2018-12-03 15:09:07,048 INFO L226 Difference]: Without dead ends: 1351 [2018-12-03 15:09:07,048 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=738, Unknown=0, NotChecked=0, Total=930 [2018-12-03 15:09:07,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1351 states. [2018-12-03 15:09:07,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1351 to 1164. [2018-12-03 15:09:07,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1164 states. [2018-12-03 15:09:07,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1164 states to 1164 states and 1865 transitions. [2018-12-03 15:09:07,349 INFO L78 Accepts]: Start accepts. Automaton has 1164 states and 1865 transitions. Word has length 16 [2018-12-03 15:09:07,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:07,349 INFO L480 AbstractCegarLoop]: Abstraction has 1164 states and 1865 transitions. [2018-12-03 15:09:07,349 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 15:09:07,349 INFO L276 IsEmpty]: Start isEmpty. Operand 1164 states and 1865 transitions. [2018-12-03 15:09:07,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 15:09:07,350 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:07,350 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:07,350 INFO L423 AbstractCegarLoop]: === Iteration 43 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:07,351 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:07,351 INFO L82 PathProgramCache]: Analyzing trace with hash 362531549, now seen corresponding path program 1 times [2018-12-03 15:09:07,351 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:07,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:07,352 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:07,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:07,352 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:07,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:07,414 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:07,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:07,414 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:07,414 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 15:09:07,415 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [38], [41], [45], [47], [50], [56], [58], [61], [65], [67], [72] [2018-12-03 15:09:07,415 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:07,415 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:07,424 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:07,424 INFO L272 AbstractInterpreter]: Visited 16 different actions 30 times. Merged at 9 different actions 10 times. Never widened. Found 6 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 15:09:07,434 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:07,435 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:07,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:07,435 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 15:09:07,443 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:07,443 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:07,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:07,449 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:07,501 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:07,501 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:07,554 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:07,573 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:07,573 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2018-12-03 15:09:07,573 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:07,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 15:09:07,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 15:09:07,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2018-12-03 15:09:07,574 INFO L87 Difference]: Start difference. First operand 1164 states and 1865 transitions. Second operand 11 states. [2018-12-03 15:09:08,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:08,400 INFO L93 Difference]: Finished difference Result 1272 states and 2019 transitions. [2018-12-03 15:09:08,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 15:09:08,401 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 15:09:08,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:08,403 INFO L225 Difference]: With dead ends: 1272 [2018-12-03 15:09:08,403 INFO L226 Difference]: Without dead ends: 1270 [2018-12-03 15:09:08,403 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=151, Invalid=551, Unknown=0, NotChecked=0, Total=702 [2018-12-03 15:09:08,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1270 states. [2018-12-03 15:09:08,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1270 to 1159. [2018-12-03 15:09:08,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1159 states. [2018-12-03 15:09:08,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1159 states to 1159 states and 1856 transitions. [2018-12-03 15:09:08,687 INFO L78 Accepts]: Start accepts. Automaton has 1159 states and 1856 transitions. Word has length 16 [2018-12-03 15:09:08,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:08,687 INFO L480 AbstractCegarLoop]: Abstraction has 1159 states and 1856 transitions. [2018-12-03 15:09:08,687 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 15:09:08,687 INFO L276 IsEmpty]: Start isEmpty. Operand 1159 states and 1856 transitions. [2018-12-03 15:09:08,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 15:09:08,688 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:08,688 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:08,688 INFO L423 AbstractCegarLoop]: === Iteration 44 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:08,688 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:08,688 INFO L82 PathProgramCache]: Analyzing trace with hash 376328497, now seen corresponding path program 1 times [2018-12-03 15:09:08,688 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:08,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:08,689 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:08,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:08,689 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:08,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:08,948 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:08,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:08,948 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:08,949 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 15:09:08,949 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [45], [47], [50], [52] [2018-12-03 15:09:08,950 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:08,951 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:08,959 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:08,959 INFO L272 AbstractInterpreter]: Visited 13 different actions 24 times. Merged at 9 different actions 10 times. Never widened. Found 4 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 15:09:08,977 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:08,977 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:08,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:08,977 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 15:09:08,985 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:08,985 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:08,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:08,990 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:09,004 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:09,004 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:09,057 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:09,075 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:09,076 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 15 [2018-12-03 15:09:09,076 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:09,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 15:09:09,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 15:09:09,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2018-12-03 15:09:09,076 INFO L87 Difference]: Start difference. First operand 1159 states and 1856 transitions. Second operand 11 states. [2018-12-03 15:09:09,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:09,841 INFO L93 Difference]: Finished difference Result 1283 states and 2043 transitions. [2018-12-03 15:09:09,841 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 15:09:09,841 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 15:09:09,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:09,843 INFO L225 Difference]: With dead ends: 1283 [2018-12-03 15:09:09,843 INFO L226 Difference]: Without dead ends: 1281 [2018-12-03 15:09:09,844 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=160, Invalid=490, Unknown=0, NotChecked=0, Total=650 [2018-12-03 15:09:09,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1281 states. [2018-12-03 15:09:10,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1281 to 1157. [2018-12-03 15:09:10,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1157 states. [2018-12-03 15:09:10,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1157 states to 1157 states and 1853 transitions. [2018-12-03 15:09:10,129 INFO L78 Accepts]: Start accepts. Automaton has 1157 states and 1853 transitions. Word has length 16 [2018-12-03 15:09:10,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:10,130 INFO L480 AbstractCegarLoop]: Abstraction has 1157 states and 1853 transitions. [2018-12-03 15:09:10,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 15:09:10,130 INFO L276 IsEmpty]: Start isEmpty. Operand 1157 states and 1853 transitions. [2018-12-03 15:09:10,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 15:09:10,131 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:10,131 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:10,131 INFO L423 AbstractCegarLoop]: === Iteration 45 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:10,132 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:10,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1354217275, now seen corresponding path program 1 times [2018-12-03 15:09:10,132 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:10,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:10,132 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:10,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:10,133 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:10,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:10,215 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:10,216 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:10,216 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:10,216 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-12-03 15:09:10,216 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [38], [41], [56], [58], [61], [63], [65], [66], [67], [70] [2018-12-03 15:09:10,217 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:10,217 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:10,226 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:10,226 INFO L272 AbstractInterpreter]: Visited 15 different actions 29 times. Merged at 9 different actions 10 times. Never widened. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 15:09:10,229 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:10,229 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:10,229 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:10,229 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 15:09:10,238 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:10,239 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:10,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:10,244 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:10,303 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:10,303 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:10,394 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:10,414 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:10,414 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 17 [2018-12-03 15:09:10,414 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:10,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 15:09:10,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 15:09:10,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2018-12-03 15:09:10,415 INFO L87 Difference]: Start difference. First operand 1157 states and 1853 transitions. Second operand 12 states. [2018-12-03 15:09:12,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:12,112 INFO L93 Difference]: Finished difference Result 1354 states and 2143 transitions. [2018-12-03 15:09:12,112 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 15:09:12,112 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 18 [2018-12-03 15:09:12,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:12,114 INFO L225 Difference]: With dead ends: 1354 [2018-12-03 15:09:12,115 INFO L226 Difference]: Without dead ends: 1352 [2018-12-03 15:09:12,115 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=292, Invalid=1190, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 15:09:12,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1352 states. [2018-12-03 15:09:12,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1352 to 1136. [2018-12-03 15:09:12,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1136 states. [2018-12-03 15:09:12,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1136 states to 1136 states and 1818 transitions. [2018-12-03 15:09:12,480 INFO L78 Accepts]: Start accepts. Automaton has 1136 states and 1818 transitions. Word has length 18 [2018-12-03 15:09:12,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:12,480 INFO L480 AbstractCegarLoop]: Abstraction has 1136 states and 1818 transitions. [2018-12-03 15:09:12,480 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 15:09:12,481 INFO L276 IsEmpty]: Start isEmpty. Operand 1136 states and 1818 transitions. [2018-12-03 15:09:12,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 15:09:12,481 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:12,481 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:12,482 INFO L423 AbstractCegarLoop]: === Iteration 46 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:12,482 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:12,482 INFO L82 PathProgramCache]: Analyzing trace with hash 1085218294, now seen corresponding path program 1 times [2018-12-03 15:09:12,482 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:12,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:12,483 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:12,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:12,483 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:12,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:12,684 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:12,684 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:12,684 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:12,685 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-12-03 15:09:12,685 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [27], [29], [32], [45], [46], [47], [50], [65], [67], [72] [2018-12-03 15:09:12,685 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:12,685 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:12,705 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:12,705 INFO L272 AbstractInterpreter]: Visited 17 different actions 47 times. Merged at 16 different actions 25 times. Widened at 1 different actions 1 times. Found 8 fixpoints after 5 different actions. Largest state had 0 variables. [2018-12-03 15:09:12,726 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:12,726 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:12,726 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:12,726 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 15:09:12,734 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:12,734 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:12,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:12,740 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:12,817 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:12,817 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:12,870 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:12,890 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 15:09:12,890 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [11] total 19 [2018-12-03 15:09:12,891 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:09:12,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:09:12,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:09:12,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=294, Unknown=0, NotChecked=0, Total=342 [2018-12-03 15:09:12,891 INFO L87 Difference]: Start difference. First operand 1136 states and 1818 transitions. Second operand 7 states. [2018-12-03 15:09:13,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:13,358 INFO L93 Difference]: Finished difference Result 1480 states and 2314 transitions. [2018-12-03 15:09:13,358 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 15:09:13,359 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2018-12-03 15:09:13,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:13,361 INFO L225 Difference]: With dead ends: 1480 [2018-12-03 15:09:13,361 INFO L226 Difference]: Without dead ends: 1197 [2018-12-03 15:09:13,362 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2018-12-03 15:09:13,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1197 states. [2018-12-03 15:09:13,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1197 to 960. [2018-12-03 15:09:13,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 960 states. [2018-12-03 15:09:13,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 960 states to 960 states and 1536 transitions. [2018-12-03 15:09:13,612 INFO L78 Accepts]: Start accepts. Automaton has 960 states and 1536 transitions. Word has length 18 [2018-12-03 15:09:13,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:13,612 INFO L480 AbstractCegarLoop]: Abstraction has 960 states and 1536 transitions. [2018-12-03 15:09:13,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:09:13,612 INFO L276 IsEmpty]: Start isEmpty. Operand 960 states and 1536 transitions. [2018-12-03 15:09:13,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 15:09:13,613 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:13,613 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:13,613 INFO L423 AbstractCegarLoop]: === Iteration 47 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:13,613 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:13,614 INFO L82 PathProgramCache]: Analyzing trace with hash 1597439053, now seen corresponding path program 1 times [2018-12-03 15:09:13,614 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:13,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:13,614 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:13,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:13,614 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:13,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:14,199 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:14,200 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:14,200 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:14,200 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-12-03 15:09:14,200 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [27], [29], [32], [45], [46], [56], [58], [61], [65], [67], [72] [2018-12-03 15:09:14,201 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:14,201 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:14,221 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:14,221 INFO L272 AbstractInterpreter]: Visited 18 different actions 50 times. Merged at 17 different actions 25 times. Widened at 1 different actions 1 times. Found 10 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 15:09:14,241 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:14,241 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:14,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:14,241 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 15:09:14,251 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:14,252 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:14,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:14,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:14,333 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:14,334 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:14,440 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:14,460 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-12-03 15:09:14,460 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [10, 7] total 19 [2018-12-03 15:09:14,460 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:09:14,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:09:14,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:09:14,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2018-12-03 15:09:14,461 INFO L87 Difference]: Start difference. First operand 960 states and 1536 transitions. Second operand 7 states. [2018-12-03 15:09:14,732 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2018-12-03 15:09:15,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:15,303 INFO L93 Difference]: Finished difference Result 1436 states and 2247 transitions. [2018-12-03 15:09:15,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 15:09:15,303 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2018-12-03 15:09:15,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:15,306 INFO L225 Difference]: With dead ends: 1436 [2018-12-03 15:09:15,306 INFO L226 Difference]: Without dead ends: 1141 [2018-12-03 15:09:15,307 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2018-12-03 15:09:15,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1141 states. [2018-12-03 15:09:15,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1141 to 956. [2018-12-03 15:09:15,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 956 states. [2018-12-03 15:09:15,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 956 states to 956 states and 1524 transitions. [2018-12-03 15:09:15,726 INFO L78 Accepts]: Start accepts. Automaton has 956 states and 1524 transitions. Word has length 18 [2018-12-03 15:09:15,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:15,726 INFO L480 AbstractCegarLoop]: Abstraction has 956 states and 1524 transitions. [2018-12-03 15:09:15,726 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:09:15,726 INFO L276 IsEmpty]: Start isEmpty. Operand 956 states and 1524 transitions. [2018-12-03 15:09:15,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 15:09:15,727 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:15,727 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:15,728 INFO L423 AbstractCegarLoop]: === Iteration 48 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:15,728 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:15,728 INFO L82 PathProgramCache]: Analyzing trace with hash -1672170852, now seen corresponding path program 1 times [2018-12-03 15:09:15,728 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:15,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:15,729 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:15,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:15,729 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:15,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:16,490 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:09:16,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:16,491 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:16,491 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-12-03 15:09:16,491 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [57], [58], [63], [65], [67], [70] [2018-12-03 15:09:16,492 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:16,492 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:16,502 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:16,502 INFO L272 AbstractInterpreter]: Visited 12 different actions 27 times. Merged at 9 different actions 12 times. Never widened. Found 5 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 15:09:16,507 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:16,507 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:16,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:16,507 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 15:09:16,515 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:16,515 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:16,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:16,522 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:16,612 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:16,612 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:16,728 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:16,757 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-12-03 15:09:16,757 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [9, 8] total 21 [2018-12-03 15:09:16,757 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:09:16,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 15:09:16,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 15:09:16,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2018-12-03 15:09:16,758 INFO L87 Difference]: Start difference. First operand 956 states and 1524 transitions. Second operand 8 states. [2018-12-03 15:09:17,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:17,897 INFO L93 Difference]: Finished difference Result 1440 states and 2248 transitions. [2018-12-03 15:09:17,897 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 15:09:17,897 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2018-12-03 15:09:17,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:17,899 INFO L225 Difference]: With dead ends: 1440 [2018-12-03 15:09:17,899 INFO L226 Difference]: Without dead ends: 1185 [2018-12-03 15:09:17,900 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=121, Invalid=635, Unknown=0, NotChecked=0, Total=756 [2018-12-03 15:09:17,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1185 states. [2018-12-03 15:09:18,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1185 to 1006. [2018-12-03 15:09:18,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1006 states. [2018-12-03 15:09:18,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1006 states to 1006 states and 1600 transitions. [2018-12-03 15:09:18,222 INFO L78 Accepts]: Start accepts. Automaton has 1006 states and 1600 transitions. Word has length 18 [2018-12-03 15:09:18,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:18,222 INFO L480 AbstractCegarLoop]: Abstraction has 1006 states and 1600 transitions. [2018-12-03 15:09:18,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 15:09:18,222 INFO L276 IsEmpty]: Start isEmpty. Operand 1006 states and 1600 transitions. [2018-12-03 15:09:18,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 15:09:18,223 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:18,223 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:18,223 INFO L423 AbstractCegarLoop]: === Iteration 49 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:18,223 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:18,223 INFO L82 PathProgramCache]: Analyzing trace with hash -1136854538, now seen corresponding path program 1 times [2018-12-03 15:09:18,223 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:18,224 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:18,224 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:18,224 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:18,224 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:18,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:18,350 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:18,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:18,351 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:18,351 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-12-03 15:09:18,351 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [27], [38], [41], [65], [67], [70], [72] [2018-12-03 15:09:18,352 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:18,352 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:18,365 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:18,365 INFO L272 AbstractInterpreter]: Visited 15 different actions 39 times. Merged at 14 different actions 21 times. Never widened. Found 6 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 15:09:18,401 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:18,401 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:18,401 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:18,401 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 15:09:18,418 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:18,418 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:18,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:18,437 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:18,513 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:18,514 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:18,595 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:18,613 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-12-03 15:09:18,613 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [9, 7] total 18 [2018-12-03 15:09:18,613 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:09:18,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:09:18,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:09:18,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2018-12-03 15:09:18,614 INFO L87 Difference]: Start difference. First operand 1006 states and 1600 transitions. Second operand 7 states. [2018-12-03 15:09:19,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:19,310 INFO L93 Difference]: Finished difference Result 1460 states and 2276 transitions. [2018-12-03 15:09:19,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 15:09:19,310 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2018-12-03 15:09:19,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:19,311 INFO L225 Difference]: With dead ends: 1460 [2018-12-03 15:09:19,311 INFO L226 Difference]: Without dead ends: 1193 [2018-12-03 15:09:19,312 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=86, Invalid=466, Unknown=0, NotChecked=0, Total=552 [2018-12-03 15:09:19,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1193 states. [2018-12-03 15:09:19,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1193 to 970. [2018-12-03 15:09:19,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 970 states. [2018-12-03 15:09:19,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 970 states to 970 states and 1538 transitions. [2018-12-03 15:09:19,618 INFO L78 Accepts]: Start accepts. Automaton has 970 states and 1538 transitions. Word has length 18 [2018-12-03 15:09:19,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:19,618 INFO L480 AbstractCegarLoop]: Abstraction has 970 states and 1538 transitions. [2018-12-03 15:09:19,618 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:09:19,619 INFO L276 IsEmpty]: Start isEmpty. Operand 970 states and 1538 transitions. [2018-12-03 15:09:19,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 15:09:19,619 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:19,619 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:19,619 INFO L423 AbstractCegarLoop]: === Iteration 50 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:19,620 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:19,620 INFO L82 PathProgramCache]: Analyzing trace with hash 975863549, now seen corresponding path program 1 times [2018-12-03 15:09:19,620 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:19,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:19,621 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:19,621 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:19,621 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:19,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:19,692 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:19,693 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:19,693 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:19,693 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-12-03 15:09:19,693 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [27], [38], [41], [65], [67], [72] [2018-12-03 15:09:19,694 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:19,694 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:19,708 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:19,708 INFO L272 AbstractInterpreter]: Visited 15 different actions 38 times. Merged at 13 different actions 20 times. Never widened. Found 6 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 15:09:19,743 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:19,743 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:19,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:19,743 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 15:09:19,759 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:19,759 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:19,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:19,767 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:19,769 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:19,769 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:19,800 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:19,820 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:19,820 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2018-12-03 15:09:19,820 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:19,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:09:19,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:09:19,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2018-12-03 15:09:19,821 INFO L87 Difference]: Start difference. First operand 970 states and 1538 transitions. Second operand 7 states. [2018-12-03 15:09:20,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:20,558 INFO L93 Difference]: Finished difference Result 1508 states and 2311 transitions. [2018-12-03 15:09:20,560 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 15:09:20,560 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2018-12-03 15:09:20,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:20,561 INFO L225 Difference]: With dead ends: 1508 [2018-12-03 15:09:20,561 INFO L226 Difference]: Without dead ends: 1367 [2018-12-03 15:09:20,562 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=98, Invalid=174, Unknown=0, NotChecked=0, Total=272 [2018-12-03 15:09:20,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1367 states. [2018-12-03 15:09:20,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1367 to 995. [2018-12-03 15:09:20,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 995 states. [2018-12-03 15:09:20,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 995 states to 995 states and 1571 transitions. [2018-12-03 15:09:20,881 INFO L78 Accepts]: Start accepts. Automaton has 995 states and 1571 transitions. Word has length 18 [2018-12-03 15:09:20,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:20,882 INFO L480 AbstractCegarLoop]: Abstraction has 995 states and 1571 transitions. [2018-12-03 15:09:20,882 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:09:20,882 INFO L276 IsEmpty]: Start isEmpty. Operand 995 states and 1571 transitions. [2018-12-03 15:09:20,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 15:09:20,882 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:20,882 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:20,883 INFO L423 AbstractCegarLoop]: === Iteration 51 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:20,883 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:20,883 INFO L82 PathProgramCache]: Analyzing trace with hash -1537299396, now seen corresponding path program 1 times [2018-12-03 15:09:20,883 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:20,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:20,884 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:20,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:20,884 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:20,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:20,958 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:20,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:20,958 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:20,958 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-12-03 15:09:20,958 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [29], [32], [38], [41], [56], [57], [58], [61], [65], [67], [70], [72] [2018-12-03 15:09:20,959 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:20,959 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:20,965 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:20,966 INFO L272 AbstractInterpreter]: Visited 15 different actions 29 times. Merged at 9 different actions 10 times. Never widened. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 15:09:20,969 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:20,969 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:20,969 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:20,969 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 15:09:20,978 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:20,978 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:20,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:20,984 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:21,041 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:21,041 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:21,119 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:21,139 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:21,139 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 17 [2018-12-03 15:09:21,139 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:21,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 15:09:21,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 15:09:21,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2018-12-03 15:09:21,140 INFO L87 Difference]: Start difference. First operand 995 states and 1571 transitions. Second operand 12 states. [2018-12-03 15:09:22,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:22,856 INFO L93 Difference]: Finished difference Result 1143 states and 1783 transitions. [2018-12-03 15:09:22,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 15:09:22,856 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 18 [2018-12-03 15:09:22,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:22,858 INFO L225 Difference]: With dead ends: 1143 [2018-12-03 15:09:22,858 INFO L226 Difference]: Without dead ends: 1141 [2018-12-03 15:09:22,859 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=292, Invalid=1190, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 15:09:22,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1141 states. [2018-12-03 15:09:23,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1141 to 970. [2018-12-03 15:09:23,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 970 states. [2018-12-03 15:09:23,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 970 states to 970 states and 1528 transitions. [2018-12-03 15:09:23,308 INFO L78 Accepts]: Start accepts. Automaton has 970 states and 1528 transitions. Word has length 18 [2018-12-03 15:09:23,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:23,309 INFO L480 AbstractCegarLoop]: Abstraction has 970 states and 1528 transitions. [2018-12-03 15:09:23,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 15:09:23,309 INFO L276 IsEmpty]: Start isEmpty. Operand 970 states and 1528 transitions. [2018-12-03 15:09:23,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 15:09:23,310 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:23,310 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2018-12-03 15:09:23,310 INFO L423 AbstractCegarLoop]: === Iteration 52 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:23,310 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:23,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1152261854, now seen corresponding path program 1 times [2018-12-03 15:09:23,310 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:23,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:23,311 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:23,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:23,311 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:23,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:23,425 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:23,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:23,425 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:23,425 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2018-12-03 15:09:23,426 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [21], [29], [32], [65], [67], [72] [2018-12-03 15:09:23,426 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:23,426 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:23,431 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:23,431 INFO L272 AbstractInterpreter]: Visited 10 different actions 15 times. Merged at 5 different actions 5 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:09:23,458 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:23,458 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:23,458 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:23,459 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 15:09:23,466 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:23,466 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:23,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:23,473 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:23,526 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:23,527 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:23,587 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:23,605 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:23,606 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7, 7] total 21 [2018-12-03 15:09:23,606 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:23,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 15:09:23,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 15:09:23,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2018-12-03 15:09:23,607 INFO L87 Difference]: Start difference. First operand 970 states and 1528 transitions. Second operand 17 states. [2018-12-03 15:09:24,713 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 17 [2018-12-03 15:09:27,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:27,360 INFO L93 Difference]: Finished difference Result 1983 states and 3119 transitions. [2018-12-03 15:09:27,360 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-12-03 15:09:27,360 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 20 [2018-12-03 15:09:27,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:27,362 INFO L225 Difference]: With dead ends: 1983 [2018-12-03 15:09:27,362 INFO L226 Difference]: Without dead ends: 1934 [2018-12-03 15:09:27,364 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2143 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1636, Invalid=5006, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 15:09:27,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1934 states. [2018-12-03 15:09:27,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1934 to 1027. [2018-12-03 15:09:27,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1027 states. [2018-12-03 15:09:27,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1027 states to 1027 states and 1652 transitions. [2018-12-03 15:09:27,765 INFO L78 Accepts]: Start accepts. Automaton has 1027 states and 1652 transitions. Word has length 20 [2018-12-03 15:09:27,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:27,765 INFO L480 AbstractCegarLoop]: Abstraction has 1027 states and 1652 transitions. [2018-12-03 15:09:27,765 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 15:09:27,766 INFO L276 IsEmpty]: Start isEmpty. Operand 1027 states and 1652 transitions. [2018-12-03 15:09:27,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 15:09:27,766 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:27,766 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:27,766 INFO L423 AbstractCegarLoop]: === Iteration 53 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:27,767 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:27,767 INFO L82 PathProgramCache]: Analyzing trace with hash -79326665, now seen corresponding path program 1 times [2018-12-03 15:09:27,767 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:27,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:27,767 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:27,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:27,767 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:27,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:27,853 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:09:27,853 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:27,853 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:27,854 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2018-12-03 15:09:27,854 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [58], [61], [63], [65], [66] [2018-12-03 15:09:27,854 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:27,855 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:27,859 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:27,859 INFO L272 AbstractInterpreter]: Visited 11 different actions 16 times. Merged at 5 different actions 5 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 15:09:27,900 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:27,900 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:27,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:27,900 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 15:09:27,913 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:27,913 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:27,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:27,922 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:27,925 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:09:27,925 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:27,952 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:09:27,972 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:27,972 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2018-12-03 15:09:27,972 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:27,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:09:27,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:09:27,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2018-12-03 15:09:27,973 INFO L87 Difference]: Start difference. First operand 1027 states and 1652 transitions. Second operand 7 states. [2018-12-03 15:09:28,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:28,538 INFO L93 Difference]: Finished difference Result 1482 states and 2324 transitions. [2018-12-03 15:09:28,538 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 15:09:28,538 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2018-12-03 15:09:28,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:28,539 INFO L225 Difference]: With dead ends: 1482 [2018-12-03 15:09:28,539 INFO L226 Difference]: Without dead ends: 1262 [2018-12-03 15:09:28,540 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2018-12-03 15:09:28,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1262 states. [2018-12-03 15:09:28,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1262 to 913. [2018-12-03 15:09:28,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 913 states. [2018-12-03 15:09:28,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 913 states to 913 states and 1474 transitions. [2018-12-03 15:09:28,838 INFO L78 Accepts]: Start accepts. Automaton has 913 states and 1474 transitions. Word has length 20 [2018-12-03 15:09:28,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:28,838 INFO L480 AbstractCegarLoop]: Abstraction has 913 states and 1474 transitions. [2018-12-03 15:09:28,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:09:28,838 INFO L276 IsEmpty]: Start isEmpty. Operand 913 states and 1474 transitions. [2018-12-03 15:09:28,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 15:09:28,839 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:28,839 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2018-12-03 15:09:28,839 INFO L423 AbstractCegarLoop]: === Iteration 54 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:28,839 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:28,840 INFO L82 PathProgramCache]: Analyzing trace with hash -79325383, now seen corresponding path program 1 times [2018-12-03 15:09:28,840 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:28,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:28,840 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:28,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:28,841 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:28,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:28,930 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:28,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:28,930 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:28,930 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2018-12-03 15:09:28,931 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [45], [46], [56], [58], [63] [2018-12-03 15:09:28,932 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:28,932 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:28,936 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:28,937 INFO L272 AbstractInterpreter]: Visited 10 different actions 15 times. Merged at 5 different actions 5 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:09:28,980 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:28,981 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:28,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:28,981 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 15:09:28,992 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:28,993 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:28,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:29,000 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:29,039 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:29,039 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:29,105 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:29,123 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:29,124 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 17 [2018-12-03 15:09:29,124 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:29,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 15:09:29,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 15:09:29,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2018-12-03 15:09:29,125 INFO L87 Difference]: Start difference. First operand 913 states and 1474 transitions. Second operand 13 states. [2018-12-03 15:09:31,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:31,260 INFO L93 Difference]: Finished difference Result 1667 states and 2658 transitions. [2018-12-03 15:09:31,260 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 15:09:31,260 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2018-12-03 15:09:31,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:31,262 INFO L225 Difference]: With dead ends: 1667 [2018-12-03 15:09:31,262 INFO L226 Difference]: Without dead ends: 1518 [2018-12-03 15:09:31,263 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=505, Invalid=1475, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 15:09:31,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1518 states. [2018-12-03 15:09:31,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1518 to 914. [2018-12-03 15:09:31,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 914 states. [2018-12-03 15:09:31,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 914 states to 914 states and 1478 transitions. [2018-12-03 15:09:31,596 INFO L78 Accepts]: Start accepts. Automaton has 914 states and 1478 transitions. Word has length 20 [2018-12-03 15:09:31,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:31,597 INFO L480 AbstractCegarLoop]: Abstraction has 914 states and 1478 transitions. [2018-12-03 15:09:31,597 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 15:09:31,597 INFO L276 IsEmpty]: Start isEmpty. Operand 914 states and 1478 transitions. [2018-12-03 15:09:31,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:09:31,597 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:31,597 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:31,598 INFO L423 AbstractCegarLoop]: === Iteration 55 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:31,598 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:31,598 INFO L82 PathProgramCache]: Analyzing trace with hash 1614386347, now seen corresponding path program 1 times [2018-12-03 15:09:31,598 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:31,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:31,599 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:31,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:31,599 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:31,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:31,750 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:09:31,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:31,750 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:31,750 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 15:09:31,750 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [25], [29], [32], [65], [66], [67], [70], [72] [2018-12-03 15:09:31,751 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:31,751 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:31,768 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:31,768 INFO L272 AbstractInterpreter]: Visited 13 different actions 31 times. Merged at 10 different actions 14 times. Widened at 1 different actions 1 times. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 15:09:31,802 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:31,802 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:31,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:31,803 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 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 15:09:31,814 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:31,814 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:31,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:31,838 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:32,511 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-12-03 15:09:32,652 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:32,653 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:32,768 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:32,787 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:32,787 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 9] total 24 [2018-12-03 15:09:32,787 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:32,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 15:09:32,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 15:09:32,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2018-12-03 15:09:32,788 INFO L87 Difference]: Start difference. First operand 914 states and 1478 transitions. Second operand 20 states. [2018-12-03 15:09:36,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:36,553 INFO L93 Difference]: Finished difference Result 2449 states and 3945 transitions. [2018-12-03 15:09:36,554 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-03 15:09:36,554 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 21 [2018-12-03 15:09:36,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:36,555 INFO L225 Difference]: With dead ends: 2449 [2018-12-03 15:09:36,555 INFO L226 Difference]: Without dead ends: 1536 [2018-12-03 15:09:36,557 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2713 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1425, Invalid=7317, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 15:09:36,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1536 states. [2018-12-03 15:09:36,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1536 to 1258. [2018-12-03 15:09:36,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1258 states. [2018-12-03 15:09:36,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1258 states to 1258 states and 2050 transitions. [2018-12-03 15:09:36,922 INFO L78 Accepts]: Start accepts. Automaton has 1258 states and 2050 transitions. Word has length 21 [2018-12-03 15:09:36,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:36,922 INFO L480 AbstractCegarLoop]: Abstraction has 1258 states and 2050 transitions. [2018-12-03 15:09:36,922 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 15:09:36,922 INFO L276 IsEmpty]: Start isEmpty. Operand 1258 states and 2050 transitions. [2018-12-03 15:09:36,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:09:36,923 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:36,923 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:36,923 INFO L423 AbstractCegarLoop]: === Iteration 56 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:36,923 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:36,923 INFO L82 PathProgramCache]: Analyzing trace with hash 1615679213, now seen corresponding path program 1 times [2018-12-03 15:09:36,923 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:36,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:36,924 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:36,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:36,924 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:36,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:37,490 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:37,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:37,491 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:37,491 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 15:09:37,491 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [25], [27], [29], [32], [45], [46], [65], [67], [70], [72] [2018-12-03 15:09:37,492 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:37,492 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:37,507 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:37,507 INFO L272 AbstractInterpreter]: Visited 17 different actions 46 times. Merged at 15 different actions 23 times. Widened at 1 different actions 1 times. Found 10 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 15:09:37,540 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:37,540 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:37,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:37,540 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 15:09:37,551 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:37,552 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:37,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:37,570 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:37,719 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:37,720 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:37,832 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:37,851 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:37,851 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 25 [2018-12-03 15:09:37,851 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:37,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 15:09:37,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 15:09:37,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2018-12-03 15:09:37,852 INFO L87 Difference]: Start difference. First operand 1258 states and 2050 transitions. Second operand 18 states. [2018-12-03 15:09:41,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:41,740 INFO L93 Difference]: Finished difference Result 2217 states and 3616 transitions. [2018-12-03 15:09:41,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-03 15:09:41,740 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 21 [2018-12-03 15:09:41,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:41,742 INFO L225 Difference]: With dead ends: 2217 [2018-12-03 15:09:41,742 INFO L226 Difference]: Without dead ends: 2215 [2018-12-03 15:09:41,743 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1803 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1092, Invalid=5388, Unknown=0, NotChecked=0, Total=6480 [2018-12-03 15:09:41,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2215 states. [2018-12-03 15:09:42,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2215 to 1626. [2018-12-03 15:09:42,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1626 states. [2018-12-03 15:09:42,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1626 states to 1626 states and 2667 transitions. [2018-12-03 15:09:42,270 INFO L78 Accepts]: Start accepts. Automaton has 1626 states and 2667 transitions. Word has length 21 [2018-12-03 15:09:42,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:42,270 INFO L480 AbstractCegarLoop]: Abstraction has 1626 states and 2667 transitions. [2018-12-03 15:09:42,270 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 15:09:42,270 INFO L276 IsEmpty]: Start isEmpty. Operand 1626 states and 2667 transitions. [2018-12-03 15:09:42,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:09:42,271 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:42,271 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:42,271 INFO L423 AbstractCegarLoop]: === Iteration 57 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:42,271 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:42,271 INFO L82 PathProgramCache]: Analyzing trace with hash 1336385522, now seen corresponding path program 1 times [2018-12-03 15:09:42,272 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:42,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:42,272 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:42,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:42,272 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:42,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:42,379 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:42,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:42,379 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:42,379 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 15:09:42,380 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [25], [29], [32], [56], [57], [65], [67], [70], [72] [2018-12-03 15:09:42,380 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:42,380 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:42,391 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:42,391 INFO L272 AbstractInterpreter]: Visited 14 different actions 35 times. Merged at 11 different actions 15 times. Widened at 1 different actions 1 times. Found 9 fixpoints after 5 different actions. Largest state had 0 variables. [2018-12-03 15:09:42,431 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:42,432 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:42,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:42,432 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 15:09:42,446 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:42,446 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:42,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:42,462 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:42,694 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:42,694 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:42,940 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:42,959 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:42,959 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 23 [2018-12-03 15:09:42,959 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:42,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 15:09:42,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 15:09:42,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=478, Unknown=0, NotChecked=0, Total=552 [2018-12-03 15:09:42,960 INFO L87 Difference]: Start difference. First operand 1626 states and 2667 transitions. Second operand 16 states. [2018-12-03 15:09:46,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:46,569 INFO L93 Difference]: Finished difference Result 2236 states and 3644 transitions. [2018-12-03 15:09:46,569 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 15:09:46,569 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2018-12-03 15:09:46,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:46,572 INFO L225 Difference]: With dead ends: 2236 [2018-12-03 15:09:46,572 INFO L226 Difference]: Without dead ends: 2234 [2018-12-03 15:09:46,573 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 963 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=900, Invalid=3390, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 15:09:46,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2234 states. [2018-12-03 15:09:47,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2234 to 1542. [2018-12-03 15:09:47,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1542 states. [2018-12-03 15:09:47,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1542 states to 1542 states and 2522 transitions. [2018-12-03 15:09:47,077 INFO L78 Accepts]: Start accepts. Automaton has 1542 states and 2522 transitions. Word has length 21 [2018-12-03 15:09:47,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:47,077 INFO L480 AbstractCegarLoop]: Abstraction has 1542 states and 2522 transitions. [2018-12-03 15:09:47,077 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 15:09:47,077 INFO L276 IsEmpty]: Start isEmpty. Operand 1542 states and 2522 transitions. [2018-12-03 15:09:47,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:09:47,077 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:47,078 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:47,078 INFO L423 AbstractCegarLoop]: === Iteration 58 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:47,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:47,078 INFO L82 PathProgramCache]: Analyzing trace with hash 1327798635, now seen corresponding path program 1 times [2018-12-03 15:09:47,078 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:47,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:47,079 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:47,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:47,079 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:47,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:47,170 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:47,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:47,170 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:47,171 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 15:09:47,171 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [25], [29], [32], [45], [46], [56], [58], [63], [65], [67], [70], [72] [2018-12-03 15:09:47,172 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:47,172 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:47,183 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:47,183 INFO L272 AbstractInterpreter]: Visited 17 different actions 40 times. Merged at 12 different actions 16 times. Widened at 1 different actions 1 times. Found 10 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 15:09:47,218 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:47,218 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:47,218 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:47,218 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 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 15:09:47,233 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:47,233 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:47,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:47,253 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:47,378 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:47,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:47,551 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:47,571 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:47,571 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 24 [2018-12-03 15:09:47,571 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:47,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 15:09:47,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 15:09:47,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=522, Unknown=0, NotChecked=0, Total=600 [2018-12-03 15:09:47,572 INFO L87 Difference]: Start difference. First operand 1542 states and 2522 transitions. Second operand 17 states. [2018-12-03 15:09:51,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:51,511 INFO L93 Difference]: Finished difference Result 2137 states and 3466 transitions. [2018-12-03 15:09:51,512 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-03 15:09:51,512 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 21 [2018-12-03 15:09:51,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:51,514 INFO L225 Difference]: With dead ends: 2137 [2018-12-03 15:09:51,514 INFO L226 Difference]: Without dead ends: 2135 [2018-12-03 15:09:51,515 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1158 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=870, Invalid=3960, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 15:09:51,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2135 states. [2018-12-03 15:09:52,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2135 to 1667. [2018-12-03 15:09:52,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1667 states. [2018-12-03 15:09:52,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1667 states to 1667 states and 2719 transitions. [2018-12-03 15:09:52,084 INFO L78 Accepts]: Start accepts. Automaton has 1667 states and 2719 transitions. Word has length 21 [2018-12-03 15:09:52,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:52,085 INFO L480 AbstractCegarLoop]: Abstraction has 1667 states and 2719 transitions. [2018-12-03 15:09:52,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 15:09:52,085 INFO L276 IsEmpty]: Start isEmpty. Operand 1667 states and 2719 transitions. [2018-12-03 15:09:52,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:09:52,086 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:52,086 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:52,086 INFO L423 AbstractCegarLoop]: === Iteration 59 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:52,087 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:52,087 INFO L82 PathProgramCache]: Analyzing trace with hash 1958649716, now seen corresponding path program 1 times [2018-12-03 15:09:52,087 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:52,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:52,088 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:52,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:52,088 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:52,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:52,199 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:52,200 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:52,200 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:52,200 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 15:09:52,200 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [56], [57], [58], [61], [65], [67], [70], [72] [2018-12-03 15:09:52,201 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:52,201 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:52,208 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:52,209 INFO L272 AbstractInterpreter]: Visited 13 different actions 29 times. Merged at 9 different actions 12 times. Never widened. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 15:09:52,227 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:52,227 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:52,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:52,227 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:52,237 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:52,237 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:52,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:52,246 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:52,371 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:52,371 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:52,506 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:52,525 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:52,525 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 24 [2018-12-03 15:09:52,525 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:52,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 15:09:52,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 15:09:52,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=528, Unknown=0, NotChecked=0, Total=600 [2018-12-03 15:09:52,526 INFO L87 Difference]: Start difference. First operand 1667 states and 2719 transitions. Second operand 17 states. [2018-12-03 15:09:57,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:57,479 INFO L93 Difference]: Finished difference Result 2404 states and 3875 transitions. [2018-12-03 15:09:57,479 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 15:09:57,479 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 21 [2018-12-03 15:09:57,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:57,482 INFO L225 Difference]: With dead ends: 2404 [2018-12-03 15:09:57,482 INFO L226 Difference]: Without dead ends: 2402 [2018-12-03 15:09:57,483 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1866 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1453, Invalid=5687, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 15:09:57,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2402 states. [2018-12-03 15:09:57,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2402 to 1292. [2018-12-03 15:09:57,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1292 states. [2018-12-03 15:09:57,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1292 states to 1292 states and 2076 transitions. [2018-12-03 15:09:57,995 INFO L78 Accepts]: Start accepts. Automaton has 1292 states and 2076 transitions. Word has length 21 [2018-12-03 15:09:57,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:57,996 INFO L480 AbstractCegarLoop]: Abstraction has 1292 states and 2076 transitions. [2018-12-03 15:09:57,996 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 15:09:57,996 INFO L276 IsEmpty]: Start isEmpty. Operand 1292 states and 2076 transitions. [2018-12-03 15:09:57,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:09:57,996 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:57,996 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:09:57,997 INFO L423 AbstractCegarLoop]: === Iteration 60 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:57,997 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:57,997 INFO L82 PathProgramCache]: Analyzing trace with hash 1950062829, now seen corresponding path program 1 times [2018-12-03 15:09:57,997 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:57,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:57,998 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:57,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:57,998 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:58,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:58,177 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:58,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:58,178 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:58,178 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 15:09:58,178 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [45], [46], [56], [58], [61], [63], [65], [67], [70], [72] [2018-12-03 15:09:58,178 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:09:58,179 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:09:58,186 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:09:58,186 INFO L272 AbstractInterpreter]: Visited 15 different actions 32 times. Merged at 9 different actions 12 times. Never widened. Found 8 fixpoints after 5 different actions. Largest state had 0 variables. [2018-12-03 15:09:58,231 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:58,231 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:09:58,232 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:58,232 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:58,243 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:58,243 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:58,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:58,263 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:58,387 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:58,388 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:58,514 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:09:58,534 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:58,534 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 26 [2018-12-03 15:09:58,534 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:58,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 15:09:58,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 15:09:58,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=619, Unknown=0, NotChecked=0, Total=702 [2018-12-03 15:09:58,535 INFO L87 Difference]: Start difference. First operand 1292 states and 2076 transitions. Second operand 19 states. [2018-12-03 15:10:04,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:10:04,071 INFO L93 Difference]: Finished difference Result 1933 states and 3058 transitions. [2018-12-03 15:10:04,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-12-03 15:10:04,072 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 21 [2018-12-03 15:10:04,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:10:04,073 INFO L225 Difference]: With dead ends: 1933 [2018-12-03 15:10:04,073 INFO L226 Difference]: Without dead ends: 1931 [2018-12-03 15:10:04,075 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2593 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1637, Invalid=7483, Unknown=0, NotChecked=0, Total=9120 [2018-12-03 15:10:04,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1931 states. [2018-12-03 15:10:04,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1931 to 1222. [2018-12-03 15:10:04,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1222 states. [2018-12-03 15:10:04,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1222 states to 1222 states and 1955 transitions. [2018-12-03 15:10:04,564 INFO L78 Accepts]: Start accepts. Automaton has 1222 states and 1955 transitions. Word has length 21 [2018-12-03 15:10:04,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:10:04,564 INFO L480 AbstractCegarLoop]: Abstraction has 1222 states and 1955 transitions. [2018-12-03 15:10:04,565 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 15:10:04,565 INFO L276 IsEmpty]: Start isEmpty. Operand 1222 states and 1955 transitions. [2018-12-03 15:10:04,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:10:04,565 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:10:04,565 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:10:04,566 INFO L423 AbstractCegarLoop]: === Iteration 61 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:10:04,566 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:04,566 INFO L82 PathProgramCache]: Analyzing trace with hash 1109912645, now seen corresponding path program 1 times [2018-12-03 15:10:04,566 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:10:04,566 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:04,566 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:04,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:04,567 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:10:04,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:04,683 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:10:04,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:04,683 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:10:04,684 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 15:10:04,684 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [27], [29], [32], [45], [46], [56], [58], [61], [65], [67], [70], [72] [2018-12-03 15:10:04,684 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:10:04,684 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:10:04,699 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:10:04,699 INFO L272 AbstractInterpreter]: Visited 19 different actions 52 times. Merged at 17 different actions 25 times. Widened at 1 different actions 1 times. Found 12 fixpoints after 7 different actions. Largest state had 0 variables. [2018-12-03 15:10:04,736 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:04,736 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:10:04,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:04,736 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:10:04,753 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:04,753 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:10:04,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:04,776 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:10:06,318 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:10:06,318 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:10:06,417 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:10:06,435 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:10:06,435 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 23 [2018-12-03 15:10:06,435 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:10:06,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 15:10:06,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 15:10:06,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=481, Unknown=0, NotChecked=0, Total=552 [2018-12-03 15:10:06,436 INFO L87 Difference]: Start difference. First operand 1222 states and 1955 transitions. Second operand 17 states. [2018-12-03 15:10:09,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:10:09,729 INFO L93 Difference]: Finished difference Result 1702 states and 2693 transitions. [2018-12-03 15:10:09,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 15:10:09,729 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 21 [2018-12-03 15:10:09,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:10:09,731 INFO L225 Difference]: With dead ends: 1702 [2018-12-03 15:10:09,731 INFO L226 Difference]: Without dead ends: 1700 [2018-12-03 15:10:09,732 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1340 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=765, Invalid=4347, Unknown=0, NotChecked=0, Total=5112 [2018-12-03 15:10:09,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1700 states. [2018-12-03 15:10:10,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1700 to 1303. [2018-12-03 15:10:10,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1303 states. [2018-12-03 15:10:10,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1303 states to 1303 states and 2069 transitions. [2018-12-03 15:10:10,291 INFO L78 Accepts]: Start accepts. Automaton has 1303 states and 2069 transitions. Word has length 21 [2018-12-03 15:10:10,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:10:10,291 INFO L480 AbstractCegarLoop]: Abstraction has 1303 states and 2069 transitions. [2018-12-03 15:10:10,291 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 15:10:10,291 INFO L276 IsEmpty]: Start isEmpty. Operand 1303 states and 2069 transitions. [2018-12-03 15:10:10,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:10:10,292 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:10:10,292 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:10:10,292 INFO L423 AbstractCegarLoop]: === Iteration 62 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:10:10,292 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:10,292 INFO L82 PathProgramCache]: Analyzing trace with hash 830619242, now seen corresponding path program 1 times [2018-12-03 15:10:10,292 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:10:10,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:10,293 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:10,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:10,293 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:10:10,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:10,419 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:10:10,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:10,419 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:10:10,419 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 15:10:10,419 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [56], [58], [61], [65], [66], [67], [70], [72] [2018-12-03 15:10:10,420 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:10:10,420 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:10:10,429 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:10:10,429 INFO L272 AbstractInterpreter]: Visited 13 different actions 29 times. Merged at 9 different actions 12 times. Never widened. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 15:10:10,439 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:10,439 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:10:10,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:10,439 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:10:10,450 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:10,450 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:10:10,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:10,458 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:10:10,537 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:10:10,538 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:10:10,661 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:10:10,679 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:10:10,680 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 24 [2018-12-03 15:10:10,680 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:10:10,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 15:10:10,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 15:10:10,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2018-12-03 15:10:10,680 INFO L87 Difference]: Start difference. First operand 1303 states and 2069 transitions. Second operand 17 states. [2018-12-03 15:10:12,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:10:12,274 INFO L93 Difference]: Finished difference Result 1390 states and 2195 transitions. [2018-12-03 15:10:12,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-03 15:10:12,274 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 21 [2018-12-03 15:10:12,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:10:12,276 INFO L225 Difference]: With dead ends: 1390 [2018-12-03 15:10:12,276 INFO L226 Difference]: Without dead ends: 1389 [2018-12-03 15:10:12,276 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=330, Invalid=1392, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 15:10:12,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1389 states. [2018-12-03 15:10:12,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1389 to 1267. [2018-12-03 15:10:12,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1267 states. [2018-12-03 15:10:12,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1267 states to 1267 states and 2003 transitions. [2018-12-03 15:10:12,781 INFO L78 Accepts]: Start accepts. Automaton has 1267 states and 2003 transitions. Word has length 21 [2018-12-03 15:10:12,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:10:12,781 INFO L480 AbstractCegarLoop]: Abstraction has 1267 states and 2003 transitions. [2018-12-03 15:10:12,781 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 15:10:12,782 INFO L276 IsEmpty]: Start isEmpty. Operand 1267 states and 2003 transitions. [2018-12-03 15:10:12,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:10:12,782 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:10:12,782 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:10:12,782 INFO L423 AbstractCegarLoop]: === Iteration 63 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:10:12,783 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:12,783 INFO L82 PathProgramCache]: Analyzing trace with hash 830618954, now seen corresponding path program 2 times [2018-12-03 15:10:12,783 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:10:12,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:12,783 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:12,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:12,784 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:10:12,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:13,366 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:10:13,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:13,367 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:10:13,367 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:10:13,367 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:10:13,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:13,367 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:10:13,376 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:10:13,376 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:10:13,385 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 15:10:13,385 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:10:13,386 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:10:13,963 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:10:13,964 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:10:14,148 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:10:14,168 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:10:14,169 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 25 [2018-12-03 15:10:14,169 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:10:14,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 15:10:14,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 15:10:14,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=559, Unknown=0, NotChecked=0, Total=650 [2018-12-03 15:10:14,170 INFO L87 Difference]: Start difference. First operand 1267 states and 2003 transitions. Second operand 18 states. [2018-12-03 15:10:17,025 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 27 [2018-12-03 15:10:18,223 WARN L180 SmtUtils]: Spent 512.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 23 [2018-12-03 15:10:18,433 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 27 [2018-12-03 15:10:19,541 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2018-12-03 15:10:20,048 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 28 [2018-12-03 15:10:20,663 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 24 [2018-12-03 15:10:20,930 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2018-12-03 15:10:21,686 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 28 [2018-12-03 15:10:22,073 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2018-12-03 15:10:22,593 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 27 [2018-12-03 15:10:23,945 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2018-12-03 15:10:24,316 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 27 [2018-12-03 15:10:25,420 WARN L180 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 26 [2018-12-03 15:10:28,970 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2018-12-03 15:10:29,310 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 23 [2018-12-03 15:10:30,467 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 28 [2018-12-03 15:10:30,926 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 28 [2018-12-03 15:10:32,399 WARN L180 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2018-12-03 15:10:34,663 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 31 [2018-12-03 15:10:34,790 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 29 [2018-12-03 15:10:35,196 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2018-12-03 15:10:37,657 WARN L180 SmtUtils]: Spent 347.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 31 [2018-12-03 15:10:38,943 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2018-12-03 15:10:39,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:10:39,627 INFO L93 Difference]: Finished difference Result 3209 states and 5032 transitions. [2018-12-03 15:10:39,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2018-12-03 15:10:39,628 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 21 [2018-12-03 15:10:39,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:10:39,630 INFO L225 Difference]: With dead ends: 3209 [2018-12-03 15:10:39,631 INFO L226 Difference]: Without dead ends: 3207 [2018-12-03 15:10:39,633 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10226 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=4184, Invalid=23871, Unknown=1, NotChecked=0, Total=28056 [2018-12-03 15:10:39,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3207 states. [2018-12-03 15:10:40,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3207 to 1194. [2018-12-03 15:10:40,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1194 states. [2018-12-03 15:10:40,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1194 states to 1194 states and 1882 transitions. [2018-12-03 15:10:40,166 INFO L78 Accepts]: Start accepts. Automaton has 1194 states and 1882 transitions. Word has length 21 [2018-12-03 15:10:40,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:10:40,166 INFO L480 AbstractCegarLoop]: Abstraction has 1194 states and 1882 transitions. [2018-12-03 15:10:40,166 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 15:10:40,166 INFO L276 IsEmpty]: Start isEmpty. Operand 1194 states and 1882 transitions. [2018-12-03 15:10:40,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:10:40,167 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:10:40,167 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 15:10:40,167 INFO L423 AbstractCegarLoop]: === Iteration 64 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:10:40,168 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:40,168 INFO L82 PathProgramCache]: Analyzing trace with hash 1780993451, now seen corresponding path program 1 times [2018-12-03 15:10:40,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:10:40,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:40,169 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:10:40,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:40,169 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:10:40,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:40,363 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:10:40,364 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:40,364 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:10:40,364 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 15:10:40,364 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [57], [58], [61], [63], [65], [67], [70] [2018-12-03 15:10:40,365 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:10:40,365 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:10:40,372 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:10:40,372 INFO L272 AbstractInterpreter]: Visited 13 different actions 29 times. Merged at 9 different actions 12 times. Never widened. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 15:10:40,400 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:40,400 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:10:40,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:40,400 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:10:40,417 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:40,418 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:10:40,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:40,440 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:10:40,684 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:10:40,684 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:10:41,254 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 13 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:10:41,273 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:10:41,273 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 22 [2018-12-03 15:10:41,273 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:10:41,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 15:10:41,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 15:10:41,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=399, Unknown=1, NotChecked=0, Total=462 [2018-12-03 15:10:41,274 INFO L87 Difference]: Start difference. First operand 1194 states and 1882 transitions. Second operand 18 states. [2018-12-03 15:10:42,560 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2018-12-03 15:10:44,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:10:44,149 INFO L93 Difference]: Finished difference Result 3260 states and 5085 transitions. [2018-12-03 15:10:44,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-03 15:10:44,150 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 21 [2018-12-03 15:10:44,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:10:44,152 INFO L225 Difference]: With dead ends: 3260 [2018-12-03 15:10:44,152 INFO L226 Difference]: Without dead ends: 1995 [2018-12-03 15:10:44,153 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=392, Invalid=1959, Unknown=1, NotChecked=0, Total=2352 [2018-12-03 15:10:44,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1995 states. [2018-12-03 15:10:44,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1995 to 1674. [2018-12-03 15:10:44,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1674 states. [2018-12-03 15:10:44,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1674 states to 1674 states and 2594 transitions. [2018-12-03 15:10:44,909 INFO L78 Accepts]: Start accepts. Automaton has 1674 states and 2594 transitions. Word has length 21 [2018-12-03 15:10:44,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:10:44,909 INFO L480 AbstractCegarLoop]: Abstraction has 1674 states and 2594 transitions. [2018-12-03 15:10:44,909 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 15:10:44,909 INFO L276 IsEmpty]: Start isEmpty. Operand 1674 states and 2594 transitions. [2018-12-03 15:10:44,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:10:44,910 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:10:44,910 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:10:44,911 INFO L423 AbstractCegarLoop]: === Iteration 65 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:10:44,911 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:44,911 INFO L82 PathProgramCache]: Analyzing trace with hash 343493869, now seen corresponding path program 1 times [2018-12-03 15:10:44,911 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:10:44,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:44,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:44,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:44,912 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:10:44,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:45,027 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:10:45,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:45,028 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:10:45,028 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 15:10:45,028 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [27], [38], [41], [65], [67], [70], [72] [2018-12-03 15:10:45,028 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:10:45,028 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:10:45,040 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:10:45,040 INFO L272 AbstractInterpreter]: Visited 16 different actions 41 times. Merged at 14 different actions 21 times. Never widened. Found 8 fixpoints after 5 different actions. Largest state had 0 variables. [2018-12-03 15:10:45,080 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:45,080 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:10:45,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:45,080 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 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:10:45,096 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:45,096 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:10:45,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:45,117 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:10:45,264 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:10:45,264 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:10:45,370 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:10:45,389 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:10:45,389 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 21 [2018-12-03 15:10:45,389 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:10:45,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 15:10:45,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 15:10:45,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2018-12-03 15:10:45,390 INFO L87 Difference]: Start difference. First operand 1674 states and 2594 transitions. Second operand 15 states. [2018-12-03 15:10:47,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:10:47,538 INFO L93 Difference]: Finished difference Result 1784 states and 2749 transitions. [2018-12-03 15:10:47,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 15:10:47,539 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 21 [2018-12-03 15:10:47,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:10:47,540 INFO L225 Difference]: With dead ends: 1784 [2018-12-03 15:10:47,540 INFO L226 Difference]: Without dead ends: 1782 [2018-12-03 15:10:47,541 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=261, Invalid=1379, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 15:10:47,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1782 states. [2018-12-03 15:10:48,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1782 to 1680. [2018-12-03 15:10:48,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1680 states. [2018-12-03 15:10:48,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1680 states to 1680 states and 2602 transitions. [2018-12-03 15:10:48,314 INFO L78 Accepts]: Start accepts. Automaton has 1680 states and 2602 transitions. Word has length 21 [2018-12-03 15:10:48,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:10:48,314 INFO L480 AbstractCegarLoop]: Abstraction has 1680 states and 2602 transitions. [2018-12-03 15:10:48,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 15:10:48,314 INFO L276 IsEmpty]: Start isEmpty. Operand 1680 states and 2602 transitions. [2018-12-03 15:10:48,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:10:48,315 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:10:48,315 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 15:10:48,315 INFO L423 AbstractCegarLoop]: === Iteration 66 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:10:48,315 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:48,316 INFO L82 PathProgramCache]: Analyzing trace with hash -2130898623, now seen corresponding path program 2 times [2018-12-03 15:10:48,316 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:10:48,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:48,316 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:48,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:48,316 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:10:48,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:48,406 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:10:48,406 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:48,407 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:10:48,407 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:10:48,407 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:10:48,407 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:48,407 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 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:10:48,415 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:10:48,416 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:10:48,424 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-12-03 15:10:48,425 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:10:48,426 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:10:48,537 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-12-03 15:10:48,537 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:10:48,655 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-12-03 15:10:48,675 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:10:48,676 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 26 [2018-12-03 15:10:48,676 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:10:48,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 15:10:48,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 15:10:48,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=610, Unknown=0, NotChecked=0, Total=702 [2018-12-03 15:10:48,676 INFO L87 Difference]: Start difference. First operand 1680 states and 2602 transitions. Second operand 19 states. [2018-12-03 15:10:50,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:10:50,951 INFO L93 Difference]: Finished difference Result 1905 states and 2933 transitions. [2018-12-03 15:10:50,951 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 15:10:50,951 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 21 [2018-12-03 15:10:50,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:10:50,953 INFO L225 Difference]: With dead ends: 1905 [2018-12-03 15:10:50,953 INFO L226 Difference]: Without dead ends: 1904 [2018-12-03 15:10:50,954 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=442, Invalid=1364, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 15:10:50,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1904 states. [2018-12-03 15:10:51,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1904 to 1686. [2018-12-03 15:10:51,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1686 states. [2018-12-03 15:10:51,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1686 states to 1686 states and 2604 transitions. [2018-12-03 15:10:51,726 INFO L78 Accepts]: Start accepts. Automaton has 1686 states and 2604 transitions. Word has length 21 [2018-12-03 15:10:51,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:10:51,726 INFO L480 AbstractCegarLoop]: Abstraction has 1686 states and 2604 transitions. [2018-12-03 15:10:51,727 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 15:10:51,727 INFO L276 IsEmpty]: Start isEmpty. Operand 1686 states and 2604 transitions. [2018-12-03 15:10:51,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:10:51,727 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:10:51,727 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:10:51,728 INFO L423 AbstractCegarLoop]: === Iteration 67 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:10:51,728 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:51,728 INFO L82 PathProgramCache]: Analyzing trace with hash -2130897853, now seen corresponding path program 1 times [2018-12-03 15:10:51,728 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:10:51,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:51,728 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:10:51,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:51,729 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:10:51,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:51,866 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:10:51,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:51,866 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:10:51,866 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 15:10:51,866 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [38], [41], [56], [58], [61], [63], [65], [67], [70], [72] [2018-12-03 15:10:51,867 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:10:51,867 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:10:51,875 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:10:51,875 INFO L272 AbstractInterpreter]: Visited 15 different actions 32 times. Merged at 9 different actions 12 times. Never widened. Found 8 fixpoints after 5 different actions. Largest state had 0 variables. [2018-12-03 15:10:51,913 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:51,913 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:10:51,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:51,913 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 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:10:51,934 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:51,935 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:10:51,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:51,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:10:52,166 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:10:52,166 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:10:52,281 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:10:52,300 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:10:52,300 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 19 [2018-12-03 15:10:52,300 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:10:52,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 15:10:52,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 15:10:52,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2018-12-03 15:10:52,301 INFO L87 Difference]: Start difference. First operand 1686 states and 2604 transitions. Second operand 13 states. [2018-12-03 15:10:54,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:10:54,284 INFO L93 Difference]: Finished difference Result 1882 states and 2891 transitions. [2018-12-03 15:10:54,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 15:10:54,284 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2018-12-03 15:10:54,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:10:54,286 INFO L225 Difference]: With dead ends: 1882 [2018-12-03 15:10:54,287 INFO L226 Difference]: Without dead ends: 1880 [2018-12-03 15:10:54,287 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=190, Invalid=1000, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 15:10:54,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1880 states. [2018-12-03 15:10:55,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1880 to 1728. [2018-12-03 15:10:55,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1728 states. [2018-12-03 15:10:55,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1728 states to 1728 states and 2673 transitions. [2018-12-03 15:10:55,061 INFO L78 Accepts]: Start accepts. Automaton has 1728 states and 2673 transitions. Word has length 21 [2018-12-03 15:10:55,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:10:55,061 INFO L480 AbstractCegarLoop]: Abstraction has 1728 states and 2673 transitions. [2018-12-03 15:10:55,061 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 15:10:55,061 INFO L276 IsEmpty]: Start isEmpty. Operand 1728 states and 2673 transitions. [2018-12-03 15:10:55,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:10:55,062 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:10:55,062 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:10:55,062 INFO L423 AbstractCegarLoop]: === Iteration 68 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:10:55,062 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:55,062 INFO L82 PathProgramCache]: Analyzing trace with hash -2139486792, now seen corresponding path program 1 times [2018-12-03 15:10:55,063 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:10:55,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:55,063 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:55,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:55,063 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:10:55,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:55,367 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:10:55,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:55,367 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:10:55,367 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 15:10:55,368 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [58], [61], [63], [65], [66], [67], [70] [2018-12-03 15:10:55,368 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:10:55,368 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:10:55,376 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:10:55,376 INFO L272 AbstractInterpreter]: Visited 13 different actions 29 times. Merged at 9 different actions 12 times. Never widened. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 15:10:55,407 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:55,407 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:10:55,407 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:55,407 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 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:10:55,427 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:55,427 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:10:55,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:55,449 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:10:56,254 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:10:56,254 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:10:56,346 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:10:56,365 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:10:56,365 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 19 [2018-12-03 15:10:56,365 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:10:56,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 15:10:56,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 15:10:56,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2018-12-03 15:10:56,366 INFO L87 Difference]: Start difference. First operand 1728 states and 2673 transitions. Second operand 13 states. [2018-12-03 15:10:58,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:10:58,618 INFO L93 Difference]: Finished difference Result 2053 states and 3178 transitions. [2018-12-03 15:10:58,618 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 15:10:58,618 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2018-12-03 15:10:58,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:10:58,620 INFO L225 Difference]: With dead ends: 2053 [2018-12-03 15:10:58,620 INFO L226 Difference]: Without dead ends: 2051 [2018-12-03 15:10:58,620 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=240, Invalid=1242, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 15:10:58,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2051 states. [2018-12-03 15:10:59,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2051 to 1778. [2018-12-03 15:10:59,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1778 states. [2018-12-03 15:10:59,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1778 states to 1778 states and 2759 transitions. [2018-12-03 15:10:59,392 INFO L78 Accepts]: Start accepts. Automaton has 1778 states and 2759 transitions. Word has length 21 [2018-12-03 15:10:59,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:10:59,392 INFO L480 AbstractCegarLoop]: Abstraction has 1778 states and 2759 transitions. [2018-12-03 15:10:59,392 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 15:10:59,393 INFO L276 IsEmpty]: Start isEmpty. Operand 1778 states and 2759 transitions. [2018-12-03 15:10:59,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:10:59,393 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:10:59,393 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:10:59,394 INFO L423 AbstractCegarLoop]: === Iteration 69 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:10:59,394 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:59,394 INFO L82 PathProgramCache]: Analyzing trace with hash 1555740810, now seen corresponding path program 3 times [2018-12-03 15:10:59,394 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:10:59,394 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:59,395 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:59,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:59,395 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:10:59,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:59,587 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:10:59,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:59,587 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:10:59,587 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:10:59,588 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:10:59,588 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:59,588 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 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:10:59,595 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:10:59,596 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:10:59,601 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:10:59,601 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:10:59,602 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:10:59,831 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:10:59,831 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:10:59,989 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:11:00,009 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:11:00,009 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 23 [2018-12-03 15:11:00,009 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:11:00,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 15:11:00,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 15:11:00,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2018-12-03 15:11:00,010 INFO L87 Difference]: Start difference. First operand 1778 states and 2759 transitions. Second operand 16 states. [2018-12-03 15:11:04,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:11:04,622 INFO L93 Difference]: Finished difference Result 2603 states and 4090 transitions. [2018-12-03 15:11:04,622 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 15:11:04,622 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2018-12-03 15:11:04,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:11:04,624 INFO L225 Difference]: With dead ends: 2603 [2018-12-03 15:11:04,624 INFO L226 Difference]: Without dead ends: 2601 [2018-12-03 15:11:04,625 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1128 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=678, Invalid=4292, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 15:11:04,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2601 states. [2018-12-03 15:11:05,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2601 to 2145. [2018-12-03 15:11:05,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2145 states. [2018-12-03 15:11:05,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2145 states to 2145 states and 3390 transitions. [2018-12-03 15:11:05,534 INFO L78 Accepts]: Start accepts. Automaton has 2145 states and 3390 transitions. Word has length 21 [2018-12-03 15:11:05,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:11:05,534 INFO L480 AbstractCegarLoop]: Abstraction has 2145 states and 3390 transitions. [2018-12-03 15:11:05,534 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 15:11:05,534 INFO L276 IsEmpty]: Start isEmpty. Operand 2145 states and 3390 transitions. [2018-12-03 15:11:05,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:11:05,535 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:11:05,535 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:11:05,535 INFO L423 AbstractCegarLoop]: === Iteration 70 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:11:05,535 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:05,536 INFO L82 PathProgramCache]: Analyzing trace with hash -1665064723, now seen corresponding path program 2 times [2018-12-03 15:11:05,536 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:11:05,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:05,536 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:11:05,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:05,536 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:11:05,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:05,624 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:11:05,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:05,624 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:11:05,625 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:11:05,625 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:11:05,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:05,625 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 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:11:05,633 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:11:05,634 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:11:05,640 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-12-03 15:11:05,640 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:11:05,641 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:11:05,807 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:11:05,807 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:11:05,904 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:11:05,924 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:11:05,924 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 22 [2018-12-03 15:11:05,924 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:11:05,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 15:11:05,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 15:11:05,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2018-12-03 15:11:05,925 INFO L87 Difference]: Start difference. First operand 2145 states and 3390 transitions. Second operand 17 states. [2018-12-03 15:11:11,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:11:11,167 INFO L93 Difference]: Finished difference Result 2749 states and 4310 transitions. [2018-12-03 15:11:11,168 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 15:11:11,168 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 21 [2018-12-03 15:11:11,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:11:11,170 INFO L225 Difference]: With dead ends: 2749 [2018-12-03 15:11:11,170 INFO L226 Difference]: Without dead ends: 2747 [2018-12-03 15:11:11,171 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 5 DeprecatedPredicates, 2774 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1602, Invalid=7710, Unknown=0, NotChecked=0, Total=9312 [2018-12-03 15:11:11,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2747 states. [2018-12-03 15:11:12,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2747 to 2110. [2018-12-03 15:11:12,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2110 states. [2018-12-03 15:11:12,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2110 states to 2110 states and 3334 transitions. [2018-12-03 15:11:12,107 INFO L78 Accepts]: Start accepts. Automaton has 2110 states and 3334 transitions. Word has length 21 [2018-12-03 15:11:12,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:11:12,107 INFO L480 AbstractCegarLoop]: Abstraction has 2110 states and 3334 transitions. [2018-12-03 15:11:12,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 15:11:12,107 INFO L276 IsEmpty]: Start isEmpty. Operand 2110 states and 3334 transitions. [2018-12-03 15:11:12,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 15:11:12,108 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:11:12,108 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:11:12,108 INFO L423 AbstractCegarLoop]: === Iteration 71 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:11:12,109 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:12,109 INFO L82 PathProgramCache]: Analyzing trace with hash -1673653662, now seen corresponding path program 2 times [2018-12-03 15:11:12,109 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:11:12,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:12,109 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:11:12,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:12,110 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:11:12,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:12,796 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:11:12,796 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:12,796 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:11:12,796 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:11:12,796 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:11:12,796 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:12,796 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 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:11:12,806 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:11:12,806 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:11:12,818 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-12-03 15:11:12,818 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:11:12,819 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:11:12,936 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:11:12,936 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:11:13,102 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:11:13,120 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:11:13,120 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 23 [2018-12-03 15:11:13,120 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:11:13,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 15:11:13,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 15:11:13,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=476, Unknown=0, NotChecked=0, Total=552 [2018-12-03 15:11:13,121 INFO L87 Difference]: Start difference. First operand 2110 states and 3334 transitions. Second operand 16 states. [2018-12-03 15:11:15,057 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2018-12-03 15:11:17,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:11:17,602 INFO L93 Difference]: Finished difference Result 2376 states and 3732 transitions. [2018-12-03 15:11:17,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 15:11:17,602 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2018-12-03 15:11:17,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:11:17,605 INFO L225 Difference]: With dead ends: 2376 [2018-12-03 15:11:17,605 INFO L226 Difference]: Without dead ends: 2374 [2018-12-03 15:11:17,605 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 689 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=670, Invalid=2990, Unknown=0, NotChecked=0, Total=3660 [2018-12-03 15:11:17,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2374 states. [2018-12-03 15:11:18,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2374 to 2107. [2018-12-03 15:11:18,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2107 states. [2018-12-03 15:11:18,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2107 states to 2107 states and 3325 transitions. [2018-12-03 15:11:18,565 INFO L78 Accepts]: Start accepts. Automaton has 2107 states and 3325 transitions. Word has length 21 [2018-12-03 15:11:18,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:11:18,565 INFO L480 AbstractCegarLoop]: Abstraction has 2107 states and 3325 transitions. [2018-12-03 15:11:18,565 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 15:11:18,565 INFO L276 IsEmpty]: Start isEmpty. Operand 2107 states and 3325 transitions. [2018-12-03 15:11:18,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 15:11:18,566 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:11:18,566 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 15:11:18,566 INFO L423 AbstractCegarLoop]: === Iteration 72 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:11:18,566 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:18,567 INFO L82 PathProgramCache]: Analyzing trace with hash 1977173104, now seen corresponding path program 1 times [2018-12-03 15:11:18,567 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:11:18,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:18,567 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:11:18,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:18,567 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:11:18,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:18,932 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:11:18,932 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:18,933 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:11:18,933 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 24 with the following transitions: [2018-12-03 15:11:18,933 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [25], [27], [29], [32], [65], [66], [67], [70], [72] [2018-12-03 15:11:18,933 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:11:18,933 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:11:18,942 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:11:18,942 INFO L272 AbstractInterpreter]: Visited 14 different actions 37 times. Merged at 12 different actions 18 times. Widened at 1 different actions 1 times. Found 9 fixpoints after 5 different actions. Largest state had 0 variables. [2018-12-03 15:11:18,966 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:18,966 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:11:18,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:18,966 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 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:11:18,975 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:11:18,975 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:11:18,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:18,984 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:11:19,146 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:11:19,146 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:11:19,303 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:11:19,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:11:19,323 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 10] total 30 [2018-12-03 15:11:19,323 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:11:19,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 15:11:19,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 15:11:19,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=826, Unknown=0, NotChecked=0, Total=930 [2018-12-03 15:11:19,324 INFO L87 Difference]: Start difference. First operand 2107 states and 3325 transitions. Second operand 22 states. [2018-12-03 15:11:27,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:11:27,623 INFO L93 Difference]: Finished difference Result 3897 states and 6034 transitions. [2018-12-03 15:11:27,623 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2018-12-03 15:11:27,623 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 23 [2018-12-03 15:11:27,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:11:27,627 INFO L225 Difference]: With dead ends: 3897 [2018-12-03 15:11:27,627 INFO L226 Difference]: Without dead ends: 3746 [2018-12-03 15:11:27,629 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5651 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2523, Invalid=14247, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 15:11:27,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3746 states. [2018-12-03 15:11:28,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3746 to 2541. [2018-12-03 15:11:28,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2541 states. [2018-12-03 15:11:28,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2541 states to 2541 states and 3965 transitions. [2018-12-03 15:11:28,974 INFO L78 Accepts]: Start accepts. Automaton has 2541 states and 3965 transitions. Word has length 23 [2018-12-03 15:11:28,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:11:28,974 INFO L480 AbstractCegarLoop]: Abstraction has 2541 states and 3965 transitions. [2018-12-03 15:11:28,974 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 15:11:28,974 INFO L276 IsEmpty]: Start isEmpty. Operand 2541 states and 3965 transitions. [2018-12-03 15:11:28,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 15:11:28,975 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:11:28,975 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:11:28,976 INFO L423 AbstractCegarLoop]: === Iteration 73 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:11:28,976 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:28,976 INFO L82 PathProgramCache]: Analyzing trace with hash 1266805704, now seen corresponding path program 1 times [2018-12-03 15:11:28,976 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:11:28,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:28,976 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:11:28,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:28,977 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:11:28,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:29,172 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:11:29,172 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:29,172 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:11:29,172 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 24 with the following transitions: [2018-12-03 15:11:29,173 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [27], [29], [32], [56], [58], [61], [65], [66], [67], [70], [72] [2018-12-03 15:11:29,173 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:11:29,173 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:11:29,185 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:11:29,185 INFO L272 AbstractInterpreter]: Visited 16 different actions 43 times. Merged at 14 different actions 20 times. Widened at 1 different actions 1 times. Found 11 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 15:11:29,195 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:29,195 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:11:29,195 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:29,195 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 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:11:29,204 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:11:29,205 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:11:29,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:29,213 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:11:29,360 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:11:29,360 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:11:29,493 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:11:29,512 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:11:29,512 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 28 [2018-12-03 15:11:29,513 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:11:29,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 15:11:29,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 15:11:29,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=725, Unknown=0, NotChecked=0, Total=812 [2018-12-03 15:11:29,513 INFO L87 Difference]: Start difference. First operand 2541 states and 3965 transitions. Second operand 21 states. [2018-12-03 15:11:35,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:11:35,829 INFO L93 Difference]: Finished difference Result 3874 states and 5970 transitions. [2018-12-03 15:11:35,830 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 15:11:35,830 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 23 [2018-12-03 15:11:35,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:11:35,833 INFO L225 Difference]: With dead ends: 3874 [2018-12-03 15:11:35,833 INFO L226 Difference]: Without dead ends: 3748 [2018-12-03 15:11:35,834 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1351 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1076, Invalid=4776, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 15:11:35,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3748 states. [2018-12-03 15:11:37,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3748 to 2841. [2018-12-03 15:11:37,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2841 states. [2018-12-03 15:11:37,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2841 states to 2841 states and 4404 transitions. [2018-12-03 15:11:37,415 INFO L78 Accepts]: Start accepts. Automaton has 2841 states and 4404 transitions. Word has length 23 [2018-12-03 15:11:37,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:11:37,415 INFO L480 AbstractCegarLoop]: Abstraction has 2841 states and 4404 transitions. [2018-12-03 15:11:37,415 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 15:11:37,415 INFO L276 IsEmpty]: Start isEmpty. Operand 2841 states and 4404 transitions. [2018-12-03 15:11:37,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 15:11:37,416 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:11:37,416 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:11:37,417 INFO L423 AbstractCegarLoop]: === Iteration 74 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:11:37,417 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:37,417 INFO L82 PathProgramCache]: Analyzing trace with hash -407447728, now seen corresponding path program 1 times [2018-12-03 15:11:37,417 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:11:37,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:37,418 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:11:37,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:37,418 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:11:37,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:37,642 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:11:37,643 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:37,643 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:11:37,643 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 24 with the following transitions: [2018-12-03 15:11:37,643 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [22], [25], [27], [38], [41], [56], [57], [65], [67], [70], [72] [2018-12-03 15:11:37,643 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:11:37,644 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:11:37,649 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:11:37,649 INFO L272 AbstractInterpreter]: Visited 15 different actions 28 times. Merged at 11 different actions 11 times. Never widened. Found 5 fixpoints after 5 different actions. Largest state had 0 variables. [2018-12-03 15:11:37,650 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:37,650 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:11:37,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:37,651 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 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:11:37,658 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:11:37,658 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:11:37,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:37,666 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:11:37,806 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:11:37,806 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:11:37,951 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:11:37,970 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:11:37,970 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9, 9] total 29 [2018-12-03 15:11:37,970 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:11:37,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 15:11:37,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 15:11:37,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=778, Unknown=0, NotChecked=0, Total=870 [2018-12-03 15:11:37,971 INFO L87 Difference]: Start difference. First operand 2841 states and 4404 transitions. Second operand 22 states. [2018-12-03 15:11:43,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:11:43,073 INFO L93 Difference]: Finished difference Result 3578 states and 5576 transitions. [2018-12-03 15:11:43,074 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 15:11:43,074 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 23 [2018-12-03 15:11:43,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:11:43,077 INFO L225 Difference]: With dead ends: 3578 [2018-12-03 15:11:43,077 INFO L226 Difference]: Without dead ends: 3491 [2018-12-03 15:11:43,078 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1327 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1036, Invalid=4664, Unknown=0, NotChecked=0, Total=5700 [2018-12-03 15:11:43,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3491 states. [2018-12-03 15:11:44,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3491 to 3037. [2018-12-03 15:11:44,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3037 states. [2018-12-03 15:11:44,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3037 states to 3037 states and 4681 transitions. [2018-12-03 15:11:44,731 INFO L78 Accepts]: Start accepts. Automaton has 3037 states and 4681 transitions. Word has length 23 [2018-12-03 15:11:44,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:11:44,731 INFO L480 AbstractCegarLoop]: Abstraction has 3037 states and 4681 transitions. [2018-12-03 15:11:44,731 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 15:11:44,731 INFO L276 IsEmpty]: Start isEmpty. Operand 3037 states and 4681 transitions. [2018-12-03 15:11:44,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 15:11:44,732 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:11:44,732 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:11:44,732 INFO L423 AbstractCegarLoop]: === Iteration 75 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:11:44,732 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:44,732 INFO L82 PathProgramCache]: Analyzing trace with hash -691565553, now seen corresponding path program 1 times [2018-12-03 15:11:44,732 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:11:44,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:44,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:11:44,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:44,733 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:11:44,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:45,050 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:11:45,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:45,050 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:11:45,050 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-12-03 15:11:45,051 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [25], [27], [29], [32], [45], [46], [47], [50], [65], [67], [70], [72] [2018-12-03 15:11:45,051 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:11:45,051 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:11:45,064 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:11:45,065 INFO L272 AbstractInterpreter]: Visited 19 different actions 51 times. Merged at 17 different actions 25 times. Widened at 1 different actions 1 times. Found 12 fixpoints after 7 different actions. Largest state had 0 variables. [2018-12-03 15:11:45,070 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:45,070 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:11:45,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:45,070 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 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:11:45,079 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:11:45,079 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:11:45,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:45,087 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:11:45,163 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:11:45,164 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:11:45,344 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:11:45,362 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:11:45,362 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 22 [2018-12-03 15:11:45,362 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:11:45,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 15:11:45,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 15:11:45,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=441, Unknown=0, NotChecked=0, Total=506 [2018-12-03 15:11:45,363 INFO L87 Difference]: Start difference. First operand 3037 states and 4681 transitions. Second operand 15 states. [2018-12-03 15:11:49,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:11:49,115 INFO L93 Difference]: Finished difference Result 3486 states and 5344 transitions. [2018-12-03 15:11:49,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 15:11:49,116 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 24 [2018-12-03 15:11:49,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:11:49,119 INFO L225 Difference]: With dead ends: 3486 [2018-12-03 15:11:49,119 INFO L226 Difference]: Without dead ends: 3465 [2018-12-03 15:11:49,120 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=266, Invalid=1374, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 15:11:49,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3465 states. [2018-12-03 15:11:50,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3465 to 2930. [2018-12-03 15:11:50,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2930 states. [2018-12-03 15:11:50,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2930 states to 2930 states and 4522 transitions. [2018-12-03 15:11:50,689 INFO L78 Accepts]: Start accepts. Automaton has 2930 states and 4522 transitions. Word has length 24 [2018-12-03 15:11:50,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:11:50,689 INFO L480 AbstractCegarLoop]: Abstraction has 2930 states and 4522 transitions. [2018-12-03 15:11:50,689 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 15:11:50,689 INFO L276 IsEmpty]: Start isEmpty. Operand 2930 states and 4522 transitions. [2018-12-03 15:11:50,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 15:11:50,690 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:11:50,690 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 15:11:50,690 INFO L423 AbstractCegarLoop]: === Iteration 76 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:11:50,691 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:50,691 INFO L82 PathProgramCache]: Analyzing trace with hash -1117536148, now seen corresponding path program 1 times [2018-12-03 15:11:50,691 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:11:50,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:50,691 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:11:50,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:50,691 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:11:50,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:50,819 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 1 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:11:50,819 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:50,819 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:11:50,819 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-12-03 15:11:50,819 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [21], [22], [25], [29], [32], [65], [67], [70], [72] [2018-12-03 15:11:50,820 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:11:50,820 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:11:50,829 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:11:50,829 INFO L272 AbstractInterpreter]: Visited 13 different actions 31 times. Merged at 10 different actions 14 times. Widened at 1 different actions 1 times. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 15:11:50,863 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:50,863 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:11:50,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:50,863 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 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:11:50,878 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:11:50,879 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:11:50,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:50,901 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:11:51,127 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 1 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:11:51,128 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:11:51,287 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 5 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:11:51,307 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:11:51,307 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 10] total 28 [2018-12-03 15:11:51,307 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:11:51,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 15:11:51,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 15:11:51,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=723, Unknown=0, NotChecked=0, Total=812 [2018-12-03 15:11:51,308 INFO L87 Difference]: Start difference. First operand 2930 states and 4522 transitions. Second operand 20 states. [2018-12-03 15:12:03,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:12:03,141 INFO L93 Difference]: Finished difference Result 5118 states and 7821 transitions. [2018-12-03 15:12:03,142 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2018-12-03 15:12:03,142 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 24 [2018-12-03 15:12:03,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:12:03,147 INFO L225 Difference]: With dead ends: 5118 [2018-12-03 15:12:03,147 INFO L226 Difference]: Without dead ends: 5091 [2018-12-03 15:12:03,148 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 3841 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=2727, Invalid=10613, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 15:12:03,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5091 states. [2018-12-03 15:12:04,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5091 to 2810. [2018-12-03 15:12:04,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2810 states. [2018-12-03 15:12:04,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2810 states to 2810 states and 4329 transitions. [2018-12-03 15:12:04,963 INFO L78 Accepts]: Start accepts. Automaton has 2810 states and 4329 transitions. Word has length 24 [2018-12-03 15:12:04,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:12:04,963 INFO L480 AbstractCegarLoop]: Abstraction has 2810 states and 4329 transitions. [2018-12-03 15:12:04,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 15:12:04,963 INFO L276 IsEmpty]: Start isEmpty. Operand 2810 states and 4329 transitions. [2018-12-03 15:12:04,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 15:12:04,964 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:12:04,964 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-03 15:12:04,964 INFO L423 AbstractCegarLoop]: === Iteration 77 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:12:04,964 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:12:04,964 INFO L82 PathProgramCache]: Analyzing trace with hash 1435449349, now seen corresponding path program 3 times [2018-12-03 15:12:04,965 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:12:04,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:04,965 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:12:04,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:04,965 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:12:04,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:05,088 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:12:05,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:05,088 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:12:05,088 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:12:05,088 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:12:05,089 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:05,089 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 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:12:05,096 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:12:05,096 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:12:05,103 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:12:05,103 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:12:05,104 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:12:05,285 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:12:05,286 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:12:05,411 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 22 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:12:05,430 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:12:05,430 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 24 [2018-12-03 15:12:05,431 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:12:05,431 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 15:12:05,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 15:12:05,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=468, Unknown=0, NotChecked=0, Total=552 [2018-12-03 15:12:05,431 INFO L87 Difference]: Start difference. First operand 2810 states and 4329 transitions. Second operand 19 states. [2018-12-03 15:12:13,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:12:13,806 INFO L93 Difference]: Finished difference Result 6097 states and 9340 transitions. [2018-12-03 15:12:13,808 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2018-12-03 15:12:13,808 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 24 [2018-12-03 15:12:13,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:12:13,812 INFO L225 Difference]: With dead ends: 6097 [2018-12-03 15:12:13,812 INFO L226 Difference]: Without dead ends: 3186 [2018-12-03 15:12:13,815 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 3443 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2031, Invalid=9525, Unknown=0, NotChecked=0, Total=11556 [2018-12-03 15:12:13,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3186 states. [2018-12-03 15:12:15,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3186 to 2459. [2018-12-03 15:12:15,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2459 states. [2018-12-03 15:12:15,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2459 states to 2459 states and 3787 transitions. [2018-12-03 15:12:15,399 INFO L78 Accepts]: Start accepts. Automaton has 2459 states and 3787 transitions. Word has length 24 [2018-12-03 15:12:15,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:12:15,400 INFO L480 AbstractCegarLoop]: Abstraction has 2459 states and 3787 transitions. [2018-12-03 15:12:15,400 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 15:12:15,400 INFO L276 IsEmpty]: Start isEmpty. Operand 2459 states and 3787 transitions. [2018-12-03 15:12:15,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 15:12:15,401 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:12:15,401 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:12:15,401 INFO L423 AbstractCegarLoop]: === Iteration 78 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:12:15,401 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:12:15,401 INFO L82 PathProgramCache]: Analyzing trace with hash -746134513, now seen corresponding path program 1 times [2018-12-03 15:12:15,401 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:12:15,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:15,402 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:12:15,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:15,402 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:12:15,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:15,675 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:12:15,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:15,675 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:12:15,676 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-12-03 15:12:15,677 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [45], [46], [47], [50], [56], [58], [61], [63], [65], [67], [70], [72] [2018-12-03 15:12:15,677 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:12:15,677 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:12:15,690 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:12:15,691 INFO L272 AbstractInterpreter]: Visited 17 different actions 34 times. Merged at 9 different actions 12 times. Never widened. Found 9 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 15:12:15,695 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:12:15,696 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:12:15,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:15,696 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 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:12:15,703 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:12:15,704 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:12:15,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:15,712 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:12:15,762 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:12:15,763 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:12:15,913 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:12:15,933 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:12:15,933 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 22 [2018-12-03 15:12:15,934 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:12:15,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 15:12:15,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 15:12:15,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2018-12-03 15:12:15,934 INFO L87 Difference]: Start difference. First operand 2459 states and 3787 transitions. Second operand 15 states. [2018-12-03 15:12:20,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:12:20,398 INFO L93 Difference]: Finished difference Result 2989 states and 4596 transitions. [2018-12-03 15:12:20,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-12-03 15:12:20,398 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 24 [2018-12-03 15:12:20,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:12:20,401 INFO L225 Difference]: With dead ends: 2989 [2018-12-03 15:12:20,401 INFO L226 Difference]: Without dead ends: 2987 [2018-12-03 15:12:20,402 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 503 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=475, Invalid=2177, Unknown=0, NotChecked=0, Total=2652 [2018-12-03 15:12:20,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2987 states. [2018-12-03 15:12:21,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2987 to 2345. [2018-12-03 15:12:21,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2345 states. [2018-12-03 15:12:21,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2345 states to 2345 states and 3614 transitions. [2018-12-03 15:12:21,949 INFO L78 Accepts]: Start accepts. Automaton has 2345 states and 3614 transitions. Word has length 24 [2018-12-03 15:12:21,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:12:21,950 INFO L480 AbstractCegarLoop]: Abstraction has 2345 states and 3614 transitions. [2018-12-03 15:12:21,950 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 15:12:21,950 INFO L276 IsEmpty]: Start isEmpty. Operand 2345 states and 3614 transitions. [2018-12-03 15:12:21,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 15:12:21,951 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:12:21,951 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-03 15:12:21,951 INFO L423 AbstractCegarLoop]: === Iteration 79 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:12:21,951 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:12:21,951 INFO L82 PathProgramCache]: Analyzing trace with hash -136248690, now seen corresponding path program 3 times [2018-12-03 15:12:21,951 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:12:21,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:21,952 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:12:21,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:21,952 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:12:21,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:22,034 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:12:22,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:22,035 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:12:22,035 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:12:22,035 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:12:22,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:22,035 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 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:12:22,044 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:12:22,044 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:12:22,051 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:12:22,052 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:12:22,053 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:12:22,181 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:12:22,181 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:12:22,291 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 22 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:12:22,310 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:12:22,310 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 22 [2018-12-03 15:12:22,310 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:12:22,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 15:12:22,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 15:12:22,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=390, Unknown=0, NotChecked=0, Total=462 [2018-12-03 15:12:22,311 INFO L87 Difference]: Start difference. First operand 2345 states and 3614 transitions. Second operand 17 states. [2018-12-03 15:12:26,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:12:26,659 INFO L93 Difference]: Finished difference Result 4969 states and 7657 transitions. [2018-12-03 15:12:26,659 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 15:12:26,659 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2018-12-03 15:12:26,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:12:26,662 INFO L225 Difference]: With dead ends: 4969 [2018-12-03 15:12:26,662 INFO L226 Difference]: Without dead ends: 2625 [2018-12-03 15:12:26,665 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 833 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=632, Invalid=3274, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 15:12:26,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2625 states. [2018-12-03 15:12:28,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2625 to 2252. [2018-12-03 15:12:28,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2252 states. [2018-12-03 15:12:28,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2252 states to 2252 states and 3457 transitions. [2018-12-03 15:12:28,240 INFO L78 Accepts]: Start accepts. Automaton has 2252 states and 3457 transitions. Word has length 24 [2018-12-03 15:12:28,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:12:28,240 INFO L480 AbstractCegarLoop]: Abstraction has 2252 states and 3457 transitions. [2018-12-03 15:12:28,240 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 15:12:28,240 INFO L276 IsEmpty]: Start isEmpty. Operand 2252 states and 3457 transitions. [2018-12-03 15:12:28,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 15:12:28,241 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:12:28,241 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:12:28,242 INFO L423 AbstractCegarLoop]: === Iteration 80 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:12:28,242 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:12:28,242 INFO L82 PathProgramCache]: Analyzing trace with hash -518454402, now seen corresponding path program 1 times [2018-12-03 15:12:28,242 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:12:28,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:28,242 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:12:28,243 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:28,243 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:12:28,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:28,359 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:12:28,360 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:28,360 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:12:28,360 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-12-03 15:12:28,360 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [27], [38], [41], [45], [47], [50], [65], [67], [72] [2018-12-03 15:12:28,361 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:12:28,361 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:12:28,374 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:12:28,374 INFO L272 AbstractInterpreter]: Visited 18 different actions 49 times. Merged at 16 different actions 25 times. Widened at 1 different actions 1 times. Found 10 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 15:12:28,389 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:12:28,389 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:12:28,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:28,389 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 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:12:28,397 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:12:28,397 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:12:28,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:28,405 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:12:28,472 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:12:28,472 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:12:28,586 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:12:28,604 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:12:28,604 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 23 [2018-12-03 15:12:28,604 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:12:28,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 15:12:28,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 15:12:28,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2018-12-03 15:12:28,605 INFO L87 Difference]: Start difference. First operand 2252 states and 3457 transitions. Second operand 16 states. [2018-12-03 15:12:31,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:12:31,951 INFO L93 Difference]: Finished difference Result 2386 states and 3653 transitions. [2018-12-03 15:12:31,951 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-03 15:12:31,951 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 24 [2018-12-03 15:12:31,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:12:31,953 INFO L225 Difference]: With dead ends: 2386 [2018-12-03 15:12:31,953 INFO L226 Difference]: Without dead ends: 2384 [2018-12-03 15:12:31,954 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=352, Invalid=2000, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 15:12:31,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2384 states. [2018-12-03 15:12:33,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2384 to 2247. [2018-12-03 15:12:33,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2247 states. [2018-12-03 15:12:33,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2247 states to 2247 states and 3447 transitions. [2018-12-03 15:12:33,467 INFO L78 Accepts]: Start accepts. Automaton has 2247 states and 3447 transitions. Word has length 24 [2018-12-03 15:12:33,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:12:33,467 INFO L480 AbstractCegarLoop]: Abstraction has 2247 states and 3447 transitions. [2018-12-03 15:12:33,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 15:12:33,467 INFO L276 IsEmpty]: Start isEmpty. Operand 2247 states and 3447 transitions. [2018-12-03 15:12:33,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-12-03 15:12:33,468 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:12:33,468 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2018-12-03 15:12:33,468 INFO L423 AbstractCegarLoop]: === Iteration 81 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:12:33,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:12:33,469 INFO L82 PathProgramCache]: Analyzing trace with hash 1962007824, now seen corresponding path program 4 times [2018-12-03 15:12:33,469 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:12:33,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:33,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:12:33,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:33,469 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:12:33,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:33,623 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 1 proven. 41 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:12:33,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:33,624 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:12:33,624 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:12:33,624 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:12:33,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:33,624 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 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:12:33,632 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:12:33,633 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:12:33,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:33,643 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:12:33,834 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 29 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-12-03 15:12:33,834 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:12:33,984 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 35 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-12-03 15:12:34,002 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:12:34,002 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 24 [2018-12-03 15:12:34,003 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:12:34,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 15:12:34,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 15:12:34,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=475, Unknown=0, NotChecked=0, Total=552 [2018-12-03 15:12:34,003 INFO L87 Difference]: Start difference. First operand 2247 states and 3447 transitions. Second operand 20 states. [2018-12-03 15:12:38,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:12:38,530 INFO L93 Difference]: Finished difference Result 5402 states and 8288 transitions. [2018-12-03 15:12:38,530 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 15:12:38,530 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 29 [2018-12-03 15:12:38,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:12:38,534 INFO L225 Difference]: With dead ends: 5402 [2018-12-03 15:12:38,534 INFO L226 Difference]: Without dead ends: 3156 [2018-12-03 15:12:38,536 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 856 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=616, Invalid=3290, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 15:12:38,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3156 states. [2018-12-03 15:12:40,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3156 to 2608. [2018-12-03 15:12:40,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2608 states. [2018-12-03 15:12:40,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2608 states to 2608 states and 4009 transitions. [2018-12-03 15:12:40,144 INFO L78 Accepts]: Start accepts. Automaton has 2608 states and 4009 transitions. Word has length 29 [2018-12-03 15:12:40,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:12:40,145 INFO L480 AbstractCegarLoop]: Abstraction has 2608 states and 4009 transitions. [2018-12-03 15:12:40,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 15:12:40,145 INFO L276 IsEmpty]: Start isEmpty. Operand 2608 states and 4009 transitions. [2018-12-03 15:12:40,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-12-03 15:12:40,146 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:12:40,146 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:12:40,147 INFO L423 AbstractCegarLoop]: === Iteration 82 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:12:40,147 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:12:40,147 INFO L82 PathProgramCache]: Analyzing trace with hash 524508242, now seen corresponding path program 1 times [2018-12-03 15:12:40,147 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:12:40,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:40,148 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:12:40,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:40,148 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:12:40,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:40,339 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:12:40,339 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:40,339 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:12:40,340 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 30 with the following transitions: [2018-12-03 15:12:40,340 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [27], [38], [41], [56], [58], [61], [63], [65], [67], [70], [72] [2018-12-03 15:12:40,341 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:12:40,341 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:12:40,353 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:12:40,353 INFO L272 AbstractInterpreter]: Visited 20 different actions 51 times. Merged at 17 different actions 23 times. Never widened. Found 14 fixpoints after 9 different actions. Largest state had 0 variables. [2018-12-03 15:12:40,371 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:12:40,371 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:12:40,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:40,371 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 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:12:40,379 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:12:40,379 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:12:40,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:40,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:12:40,498 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:12:40,499 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:12:40,647 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:12:40,666 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:12:40,667 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 25 [2018-12-03 15:12:40,667 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:12:40,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 15:12:40,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 15:12:40,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=570, Unknown=0, NotChecked=0, Total=650 [2018-12-03 15:12:40,667 INFO L87 Difference]: Start difference. First operand 2608 states and 4009 transitions. Second operand 17 states. [2018-12-03 15:12:50,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:12:50,741 INFO L93 Difference]: Finished difference Result 4851 states and 7526 transitions. [2018-12-03 15:12:50,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2018-12-03 15:12:50,742 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2018-12-03 15:12:50,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:12:50,747 INFO L225 Difference]: With dead ends: 4851 [2018-12-03 15:12:50,747 INFO L226 Difference]: Without dead ends: 4822 [2018-12-03 15:12:50,749 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3927 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2180, Invalid=10702, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 15:12:50,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4822 states. [2018-12-03 15:12:53,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4822 to 3122. [2018-12-03 15:12:53,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3122 states. [2018-12-03 15:12:53,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3122 states to 3122 states and 4833 transitions. [2018-12-03 15:12:53,426 INFO L78 Accepts]: Start accepts. Automaton has 3122 states and 4833 transitions. Word has length 29 [2018-12-03 15:12:53,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:12:53,426 INFO L480 AbstractCegarLoop]: Abstraction has 3122 states and 4833 transitions. [2018-12-03 15:12:53,426 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 15:12:53,426 INFO L276 IsEmpty]: Start isEmpty. Operand 3122 states and 4833 transitions. [2018-12-03 15:12:53,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-12-03 15:12:53,428 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:12:53,428 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 15:12:53,428 INFO L423 AbstractCegarLoop]: === Iteration 83 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:12:53,428 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:12:53,428 INFO L82 PathProgramCache]: Analyzing trace with hash -1958472419, now seen corresponding path program 4 times [2018-12-03 15:12:53,429 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:12:53,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:53,429 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:12:53,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:53,429 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:12:53,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:53,569 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:12:53,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:53,570 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:12:53,570 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:12:53,570 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:12:53,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:53,570 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 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:12:53,578 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:12:53,578 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:12:53,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:53,588 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:12:53,678 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 1 proven. 44 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:12:53,679 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:12:53,831 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 5 proven. 40 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:12:53,852 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:12:53,852 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 25 [2018-12-03 15:12:53,852 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:12:53,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 15:12:53,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 15:12:53,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=570, Unknown=0, NotChecked=0, Total=650 [2018-12-03 15:12:53,853 INFO L87 Difference]: Start difference. First operand 3122 states and 4833 transitions. Second operand 17 states. [2018-12-03 15:13:03,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:13:03,326 INFO L93 Difference]: Finished difference Result 4638 states and 7146 transitions. [2018-12-03 15:13:03,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 15:13:03,327 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2018-12-03 15:13:03,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:13:03,331 INFO L225 Difference]: With dead ends: 4638 [2018-12-03 15:13:03,331 INFO L226 Difference]: Without dead ends: 4601 [2018-12-03 15:13:03,333 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2542 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1860, Invalid=7452, Unknown=0, NotChecked=0, Total=9312 [2018-12-03 15:13:03,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4601 states. [2018-12-03 15:13:05,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4601 to 2921. [2018-12-03 15:13:05,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2921 states. [2018-12-03 15:13:05,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2921 states to 2921 states and 4479 transitions. [2018-12-03 15:13:05,306 INFO L78 Accepts]: Start accepts. Automaton has 2921 states and 4479 transitions. Word has length 29 [2018-12-03 15:13:05,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:13:05,306 INFO L480 AbstractCegarLoop]: Abstraction has 2921 states and 4479 transitions. [2018-12-03 15:13:05,306 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 15:13:05,306 INFO L276 IsEmpty]: Start isEmpty. Operand 2921 states and 4479 transitions. [2018-12-03 15:13:05,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-12-03 15:13:05,308 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:13:05,308 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:13:05,308 INFO L423 AbstractCegarLoop]: === Iteration 84 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:13:05,308 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:13:05,308 INFO L82 PathProgramCache]: Analyzing trace with hash 1748672885, now seen corresponding path program 1 times [2018-12-03 15:13:05,308 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:13:05,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:13:05,309 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:13:05,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:13:05,309 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:13:05,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:13:05,460 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 23 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:13:05,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:13:05,461 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:13:05,461 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-12-03 15:13:05,461 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [22], [25], [27], [38], [41], [56], [57], [58], [61], [63], [65], [67], [70], [72] [2018-12-03 15:13:05,462 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:13:05,462 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:13:05,468 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:13:05,469 INFO L272 AbstractInterpreter]: Visited 18 different actions 38 times. Merged at 12 different actions 15 times. Never widened. Found 10 fixpoints after 7 different actions. Largest state had 0 variables. [2018-12-03 15:13:05,469 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:13:05,470 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:13:05,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:13:05,470 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 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:13:05,480 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:13:05,480 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:13:05,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:13:05,490 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:13:05,699 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:13:05,699 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:13:05,894 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 5 proven. 19 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:13:05,915 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:13:05,915 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 11] total 33 [2018-12-03 15:13:05,915 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:13:05,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 15:13:05,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 15:13:05,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=999, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 15:13:05,916 INFO L87 Difference]: Start difference. First operand 2921 states and 4479 transitions. Second operand 24 states. [2018-12-03 15:13:29,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:13:29,587 INFO L93 Difference]: Finished difference Result 7278 states and 11277 transitions. [2018-12-03 15:13:29,588 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 217 states. [2018-12-03 15:13:29,588 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2018-12-03 15:13:29,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:13:29,594 INFO L225 Difference]: With dead ends: 7278 [2018-12-03 15:13:29,594 INFO L226 Difference]: Without dead ends: 7090 [2018-12-03 15:13:29,596 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 244 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23502 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=7275, Invalid=52995, Unknown=0, NotChecked=0, Total=60270 [2018-12-03 15:13:29,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7090 states. [2018-12-03 15:13:32,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7090 to 4053. [2018-12-03 15:13:32,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4053 states. [2018-12-03 15:13:32,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4053 states to 4053 states and 6243 transitions. [2018-12-03 15:13:32,392 INFO L78 Accepts]: Start accepts. Automaton has 4053 states and 6243 transitions. Word has length 31 [2018-12-03 15:13:32,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:13:32,392 INFO L480 AbstractCegarLoop]: Abstraction has 4053 states and 6243 transitions. [2018-12-03 15:13:32,393 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 15:13:32,393 INFO L276 IsEmpty]: Start isEmpty. Operand 4053 states and 6243 transitions. [2018-12-03 15:13:32,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 15:13:32,395 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:13:32,395 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:13:32,395 INFO L423 AbstractCegarLoop]: === Iteration 85 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:13:32,395 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:13:32,395 INFO L82 PathProgramCache]: Analyzing trace with hash 241236497, now seen corresponding path program 2 times [2018-12-03 15:13:32,395 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:13:32,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:13:32,396 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:13:32,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:13:32,396 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:13:32,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:13:32,523 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 23 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:13:32,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:13:32,523 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:13:32,523 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:13:32,523 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:13:32,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:13:32,524 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 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:13:32,575 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:13:32,575 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:13:32,587 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 15:13:32,587 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:13:32,589 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:13:33,099 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 1 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 15:13:33,099 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:13:33,420 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 15:13:33,439 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:13:33,439 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 10] total 28 [2018-12-03 15:13:33,439 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:13:33,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 15:13:33,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 15:13:33,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=708, Unknown=0, NotChecked=0, Total=812 [2018-12-03 15:13:33,440 INFO L87 Difference]: Start difference. First operand 4053 states and 6243 transitions. Second operand 20 states. [2018-12-03 15:13:36,969 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2018-12-03 15:13:45,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:13:45,603 INFO L93 Difference]: Finished difference Result 6387 states and 9815 transitions. [2018-12-03 15:13:45,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-12-03 15:13:45,603 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 32 [2018-12-03 15:13:45,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:13:45,609 INFO L225 Difference]: With dead ends: 6387 [2018-12-03 15:13:45,609 INFO L226 Difference]: Without dead ends: 6385 [2018-12-03 15:13:45,610 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2099 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1096, Invalid=7276, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 15:13:45,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6385 states. [2018-12-03 15:13:48,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6385 to 4730. [2018-12-03 15:13:48,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4730 states. [2018-12-03 15:13:48,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4730 states to 4730 states and 7301 transitions. [2018-12-03 15:13:48,772 INFO L78 Accepts]: Start accepts. Automaton has 4730 states and 7301 transitions. Word has length 32 [2018-12-03 15:13:48,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:13:48,772 INFO L480 AbstractCegarLoop]: Abstraction has 4730 states and 7301 transitions. [2018-12-03 15:13:48,772 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 15:13:48,772 INFO L276 IsEmpty]: Start isEmpty. Operand 4730 states and 7301 transitions. [2018-12-03 15:13:48,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 15:13:48,775 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:13:48,775 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:13:48,775 INFO L423 AbstractCegarLoop]: === Iteration 86 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:13:48,775 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:13:48,776 INFO L82 PathProgramCache]: Analyzing trace with hash 1235175139, now seen corresponding path program 1 times [2018-12-03 15:13:48,776 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:13:48,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:13:48,776 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:13:48,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:13:48,776 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:13:48,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:13:49,075 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:13:49,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:13:49,075 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:13:49,075 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 33 with the following transitions: [2018-12-03 15:13:49,075 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [27], [38], [41], [45], [47], [50], [56], [58], [61], [63], [65], [67], [72] [2018-12-03 15:13:49,076 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:13:49,076 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:13:49,091 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:13:49,091 INFO L272 AbstractInterpreter]: Visited 22 different actions 59 times. Merged at 19 different actions 27 times. Widened at 1 different actions 1 times. Found 16 fixpoints after 9 different actions. Largest state had 0 variables. [2018-12-03 15:13:49,121 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:13:49,121 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:13:49,121 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:13:49,121 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 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:13:49,136 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:13:49,136 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:13:49,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:13:49,159 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:13:49,291 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 2 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 15:13:49,291 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:13:49,432 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 2 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 15:13:49,450 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:13:49,450 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 10] total 25 [2018-12-03 15:13:49,450 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:13:49,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 15:13:49,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 15:13:49,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2018-12-03 15:13:49,451 INFO L87 Difference]: Start difference. First operand 4730 states and 7301 transitions. Second operand 17 states. [2018-12-03 15:13:54,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:13:54,781 INFO L93 Difference]: Finished difference Result 5039 states and 7773 transitions. [2018-12-03 15:13:54,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 15:13:54,781 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-12-03 15:13:54,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:13:54,786 INFO L225 Difference]: With dead ends: 5039 [2018-12-03 15:13:54,786 INFO L226 Difference]: Without dead ends: 5037 [2018-12-03 15:13:54,788 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=331, Invalid=1925, Unknown=0, NotChecked=0, Total=2256 [2018-12-03 15:13:54,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5037 states. [2018-12-03 15:13:58,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5037 to 4736. [2018-12-03 15:13:58,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4736 states. [2018-12-03 15:13:58,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4736 states to 4736 states and 7311 transitions. [2018-12-03 15:13:58,017 INFO L78 Accepts]: Start accepts. Automaton has 4736 states and 7311 transitions. Word has length 32 [2018-12-03 15:13:58,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:13:58,018 INFO L480 AbstractCegarLoop]: Abstraction has 4736 states and 7311 transitions. [2018-12-03 15:13:58,018 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 15:13:58,018 INFO L276 IsEmpty]: Start isEmpty. Operand 4736 states and 7311 transitions. [2018-12-03 15:13:58,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-12-03 15:13:58,021 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:13:58,021 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:13:58,022 INFO L423 AbstractCegarLoop]: === Iteration 87 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:13:58,022 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:13:58,022 INFO L82 PathProgramCache]: Analyzing trace with hash -1043085211, now seen corresponding path program 3 times [2018-12-03 15:13:58,022 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:13:58,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:13:58,023 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:13:58,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:13:58,023 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:13:58,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:13:58,099 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:13:58,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:13:58,100 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:13:58,100 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:13:58,100 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:13:58,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:13:58,100 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 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:13:58,111 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:13:58,111 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:13:58,120 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:13:58,120 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:13:58,121 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:13:58,224 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-03 15:13:58,225 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:13:58,308 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 13 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-03 15:13:58,326 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:13:58,327 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 19 [2018-12-03 15:13:58,327 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:13:58,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 15:13:58,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 15:13:58,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2018-12-03 15:13:58,328 INFO L87 Difference]: Start difference. First operand 4736 states and 7311 transitions. Second operand 14 states. [2018-12-03 15:14:06,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:14:06,820 INFO L93 Difference]: Finished difference Result 13066 states and 20005 transitions. [2018-12-03 15:14:06,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-12-03 15:14:06,821 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2018-12-03 15:14:06,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:14:06,829 INFO L225 Difference]: With dead ends: 13066 [2018-12-03 15:14:06,829 INFO L226 Difference]: Without dead ends: 8107 [2018-12-03 15:14:06,834 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1830 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1272, Invalid=4734, Unknown=0, NotChecked=0, Total=6006 [2018-12-03 15:14:06,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8107 states. [2018-12-03 15:14:11,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8107 to 6666. [2018-12-03 15:14:11,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6666 states. [2018-12-03 15:14:11,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6666 states to 6666 states and 9989 transitions. [2018-12-03 15:14:11,415 INFO L78 Accepts]: Start accepts. Automaton has 6666 states and 9989 transitions. Word has length 35 [2018-12-03 15:14:11,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:14:11,415 INFO L480 AbstractCegarLoop]: Abstraction has 6666 states and 9989 transitions. [2018-12-03 15:14:11,415 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 15:14:11,415 INFO L276 IsEmpty]: Start isEmpty. Operand 6666 states and 9989 transitions. [2018-12-03 15:14:11,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-12-03 15:14:11,419 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:14:11,420 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1] [2018-12-03 15:14:11,420 INFO L423 AbstractCegarLoop]: === Iteration 88 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:14:11,420 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:14:11,420 INFO L82 PathProgramCache]: Analyzing trace with hash 2078214942, now seen corresponding path program 2 times [2018-12-03 15:14:11,420 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:14:11,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:14:11,421 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:14:11,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:14:11,421 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:14:11,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:14:11,661 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 57 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 15:14:11,661 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:14:11,661 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:14:11,661 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:14:11,661 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:14:11,661 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:14:11,661 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 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:14:11,670 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:14:11,671 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:14:11,737 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 15:14:11,737 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:14:11,739 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:14:11,990 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 3 proven. 57 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 15:14:11,991 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:14:12,237 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 3 proven. 57 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 15:14:12,255 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:14:12,255 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 12, 12] total 39 [2018-12-03 15:14:12,255 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:14:12,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 15:14:12,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 15:14:12,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1414, Unknown=0, NotChecked=0, Total=1560 [2018-12-03 15:14:12,256 INFO L87 Difference]: Start difference. First operand 6666 states and 9989 transitions. Second operand 29 states. [2018-12-03 15:14:30,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:14:30,599 INFO L93 Difference]: Finished difference Result 9823 states and 14704 transitions. [2018-12-03 15:14:30,599 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2018-12-03 15:14:30,599 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 37 [2018-12-03 15:14:30,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:14:30,608 INFO L225 Difference]: With dead ends: 9823 [2018-12-03 15:14:30,608 INFO L226 Difference]: Without dead ends: 9706 [2018-12-03 15:14:30,610 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4930 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3272, Invalid=14550, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 15:14:30,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9706 states. [2018-12-03 15:14:35,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9706 to 7062. [2018-12-03 15:14:35,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7062 states. [2018-12-03 15:14:35,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7062 states to 7062 states and 10570 transitions. [2018-12-03 15:14:35,648 INFO L78 Accepts]: Start accepts. Automaton has 7062 states and 10570 transitions. Word has length 37 [2018-12-03 15:14:35,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:14:35,648 INFO L480 AbstractCegarLoop]: Abstraction has 7062 states and 10570 transitions. [2018-12-03 15:14:35,648 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 15:14:35,648 INFO L276 IsEmpty]: Start isEmpty. Operand 7062 states and 10570 transitions. [2018-12-03 15:14:35,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 15:14:35,652 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:14:35,652 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:14:35,653 INFO L423 AbstractCegarLoop]: === Iteration 89 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:14:35,653 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:14:35,653 INFO L82 PathProgramCache]: Analyzing trace with hash -1371904424, now seen corresponding path program 4 times [2018-12-03 15:14:35,653 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:14:35,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:14:35,653 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:14:35,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:14:35,654 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:14:35,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:14:35,807 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 5 proven. 33 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-12-03 15:14:35,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:14:35,808 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:14:35,808 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:14:35,808 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:14:35,808 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:14:35,808 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 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:14:35,818 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:14:35,818 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:14:35,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:14:35,830 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:14:35,999 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 14 proven. 7 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-03 15:14:35,999 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:14:36,137 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 16 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-03 15:14:36,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:14:36,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 9] total 27 [2018-12-03 15:14:36,155 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:14:36,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 15:14:36,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 15:14:36,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=614, Unknown=0, NotChecked=0, Total=702 [2018-12-03 15:14:36,156 INFO L87 Difference]: Start difference. First operand 7062 states and 10570 transitions. Second operand 22 states. [2018-12-03 15:14:47,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:14:47,894 INFO L93 Difference]: Finished difference Result 15751 states and 23579 transitions. [2018-12-03 15:14:47,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 15:14:47,894 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 38 [2018-12-03 15:14:47,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:14:47,903 INFO L225 Difference]: With dead ends: 15751 [2018-12-03 15:14:47,903 INFO L226 Difference]: Without dead ends: 10208 [2018-12-03 15:14:47,909 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1723 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=867, Invalid=5613, Unknown=0, NotChecked=0, Total=6480 [2018-12-03 15:14:47,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10208 states. [2018-12-03 15:14:53,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10208 to 7155. [2018-12-03 15:14:53,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7155 states. [2018-12-03 15:14:53,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7155 states to 7155 states and 10708 transitions. [2018-12-03 15:14:53,276 INFO L78 Accepts]: Start accepts. Automaton has 7155 states and 10708 transitions. Word has length 38 [2018-12-03 15:14:53,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:14:53,276 INFO L480 AbstractCegarLoop]: Abstraction has 7155 states and 10708 transitions. [2018-12-03 15:14:53,276 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 15:14:53,276 INFO L276 IsEmpty]: Start isEmpty. Operand 7155 states and 10708 transitions. [2018-12-03 15:14:53,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 15:14:53,281 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:14:53,281 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:14:53,281 INFO L423 AbstractCegarLoop]: === Iteration 90 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:14:53,281 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:14:53,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1029120164, now seen corresponding path program 1 times [2018-12-03 15:14:53,282 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:14:53,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:14:53,282 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:14:53,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:14:53,282 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:14:53,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:14:53,437 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 3 proven. 29 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-12-03 15:14:53,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:14:53,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:14:53,437 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 39 with the following transitions: [2018-12-03 15:14:53,437 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [27], [38], [41], [45], [47], [50], [56], [58], [61], [63], [65], [67], [70], [72] [2018-12-03 15:14:53,438 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:14:53,438 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:14:53,451 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:14:53,452 INFO L272 AbstractInterpreter]: Visited 23 different actions 61 times. Merged at 19 different actions 27 times. Widened at 1 different actions 1 times. Found 18 fixpoints after 10 different actions. Largest state had 0 variables. [2018-12-03 15:14:53,470 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:14:53,470 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:14:53,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:14:53,470 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 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:14:53,478 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:14:53,478 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:14:53,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:14:53,491 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:14:53,656 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-03 15:14:53,656 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:14:53,796 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-03 15:14:53,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:14:53,817 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 9] total 27 [2018-12-03 15:14:53,817 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:14:53,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 15:14:53,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 15:14:53,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=618, Unknown=0, NotChecked=0, Total=702 [2018-12-03 15:14:53,818 INFO L87 Difference]: Start difference. First operand 7155 states and 10708 transitions. Second operand 22 states. [2018-12-03 15:15:05,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:15:05,123 INFO L93 Difference]: Finished difference Result 15735 states and 23603 transitions. [2018-12-03 15:15:05,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 15:15:05,124 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 38 [2018-12-03 15:15:05,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:15:05,131 INFO L225 Difference]: With dead ends: 15735 [2018-12-03 15:15:05,131 INFO L226 Difference]: Without dead ends: 10029 [2018-12-03 15:15:05,136 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1961 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=854, Invalid=6286, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 15:15:05,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10029 states. [2018-12-03 15:15:10,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10029 to 7999. [2018-12-03 15:15:10,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7999 states. [2018-12-03 15:15:10,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7999 states to 7999 states and 12001 transitions. [2018-12-03 15:15:10,977 INFO L78 Accepts]: Start accepts. Automaton has 7999 states and 12001 transitions. Word has length 38 [2018-12-03 15:15:10,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:15:10,977 INFO L480 AbstractCegarLoop]: Abstraction has 7999 states and 12001 transitions. [2018-12-03 15:15:10,977 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 15:15:10,977 INFO L276 IsEmpty]: Start isEmpty. Operand 7999 states and 12001 transitions. [2018-12-03 15:15:10,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-12-03 15:15:10,983 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:15:10,983 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-03 15:15:10,983 INFO L423 AbstractCegarLoop]: === Iteration 91 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:15:10,983 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:15:10,983 INFO L82 PathProgramCache]: Analyzing trace with hash -1224067412, now seen corresponding path program 2 times [2018-12-03 15:15:10,984 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:15:10,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:15:10,984 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:15:10,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:15:10,985 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:15:10,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:15:11,366 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 6 proven. 76 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:15:11,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:15:11,366 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:15:11,366 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:15:11,366 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:15:11,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:15:11,366 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 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:15:11,376 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:15:11,376 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:15:11,389 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 15:15:11,389 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:15:11,392 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:15:12,026 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 1 proven. 69 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-03 15:15:12,027 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:15:12,316 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 9 proven. 61 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-03 15:15:12,334 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:15:12,334 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 11, 11] total 36 [2018-12-03 15:15:12,334 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:15:12,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 15:15:12,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 15:15:12,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1201, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 15:15:12,335 INFO L87 Difference]: Start difference. First operand 7999 states and 12001 transitions. Second operand 27 states. [2018-12-03 15:15:21,742 WARN L180 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 35 [2018-12-03 15:15:23,454 WARN L180 SmtUtils]: Spent 289.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2018-12-03 15:15:28,208 WARN L180 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2018-12-03 15:15:28,733 WARN L180 SmtUtils]: Spent 342.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 32 [2018-12-03 15:15:29,779 WARN L180 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2018-12-03 15:15:30,645 WARN L180 SmtUtils]: Spent 310.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 33 [2018-12-03 15:15:31,217 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 35 [2018-12-03 15:15:32,138 WARN L180 SmtUtils]: Spent 397.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2018-12-03 15:15:33,171 WARN L180 SmtUtils]: Spent 610.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 35 [2018-12-03 15:15:34,941 WARN L180 SmtUtils]: Spent 310.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2018-12-03 15:15:37,818 WARN L180 SmtUtils]: Spent 305.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2018-12-03 15:15:40,615 WARN L180 SmtUtils]: Spent 565.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 31 [2018-12-03 15:15:41,150 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 34 [2018-12-03 15:15:42,600 WARN L180 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 33 [2018-12-03 15:15:42,748 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2018-12-03 15:15:42,967 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 35 [2018-12-03 15:15:44,325 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 36 [2018-12-03 15:15:46,116 WARN L180 SmtUtils]: Spent 355.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 42 [2018-12-03 15:15:47,303 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2018-12-03 15:15:47,747 WARN L180 SmtUtils]: Spent 334.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 44 [2018-12-03 15:15:48,295 WARN L180 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 42 [2018-12-03 15:15:50,950 WARN L180 SmtUtils]: Spent 561.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 32 [2018-12-03 15:15:51,997 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 27 [2018-12-03 15:15:53,558 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2018-12-03 15:15:53,915 WARN L180 SmtUtils]: Spent 330.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 30 [2018-12-03 15:15:56,169 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2018-12-03 15:15:58,224 WARN L180 SmtUtils]: Spent 488.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 38 [2018-12-03 15:16:00,757 WARN L180 SmtUtils]: Spent 605.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 30 [2018-12-03 15:16:02,359 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2018-12-03 15:16:02,746 WARN L180 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2018-12-03 15:16:03,605 WARN L180 SmtUtils]: Spent 313.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2018-12-03 15:16:07,785 WARN L180 SmtUtils]: Spent 303.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2018-12-03 15:16:12,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:16:12,043 INFO L93 Difference]: Finished difference Result 13389 states and 20162 transitions. [2018-12-03 15:16:12,044 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 215 states. [2018-12-03 15:16:12,044 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 40 [2018-12-03 15:16:12,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:16:12,055 INFO L225 Difference]: With dead ends: 13389 [2018-12-03 15:16:12,055 INFO L226 Difference]: Without dead ends: 13387 [2018-12-03 15:16:12,058 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20496 ImplicationChecksByTransitivity, 23.7s TimeCoverageRelationStatistics Valid=7306, Invalid=51494, Unknown=6, NotChecked=0, Total=58806 [2018-12-03 15:16:12,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13387 states. [2018-12-03 15:16:18,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13387 to 8253. [2018-12-03 15:16:18,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8253 states. [2018-12-03 15:16:18,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8253 states to 8253 states and 12418 transitions. [2018-12-03 15:16:18,132 INFO L78 Accepts]: Start accepts. Automaton has 8253 states and 12418 transitions. Word has length 40 [2018-12-03 15:16:18,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:16:18,133 INFO L480 AbstractCegarLoop]: Abstraction has 8253 states and 12418 transitions. [2018-12-03 15:16:18,133 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 15:16:18,133 INFO L276 IsEmpty]: Start isEmpty. Operand 8253 states and 12418 transitions. [2018-12-03 15:16:18,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 15:16:18,138 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:16:18,138 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1] [2018-12-03 15:16:18,139 INFO L423 AbstractCegarLoop]: === Iteration 92 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:16:18,139 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:16:18,139 INFO L82 PathProgramCache]: Analyzing trace with hash -789014831, now seen corresponding path program 3 times [2018-12-03 15:16:18,139 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:16:18,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:16:18,140 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:16:18,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:16:18,140 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:16:18,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:16:18,418 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 12 proven. 77 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 15:16:18,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:16:18,419 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:16:18,419 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:16:18,420 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:16:18,420 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:16:18,420 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 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:16:18,428 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:16:18,428 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:16:18,442 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:16:18,442 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:16:18,443 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:16:18,586 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 45 proven. 28 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-12-03 15:16:18,586 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:16:18,713 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 51 proven. 22 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-12-03 15:16:18,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:16:18,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 9, 9] total 31 [2018-12-03 15:16:18,731 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:16:18,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-12-03 15:16:18,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-12-03 15:16:18,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=836, Unknown=0, NotChecked=0, Total=930 [2018-12-03 15:16:18,732 INFO L87 Difference]: Start difference. First operand 8253 states and 12418 transitions. Second operand 28 states. [2018-12-03 15:16:39,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:16:39,323 INFO L93 Difference]: Finished difference Result 22866 states and 34563 transitions. [2018-12-03 15:16:39,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2018-12-03 15:16:39,323 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 42 [2018-12-03 15:16:39,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:16:39,336 INFO L225 Difference]: With dead ends: 22866 [2018-12-03 15:16:39,336 INFO L226 Difference]: Without dead ends: 16060 [2018-12-03 15:16:39,341 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 72 SyntacticMatches, 4 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8307 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=3391, Invalid=21415, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 15:16:39,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16060 states. [2018-12-03 15:16:48,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16060 to 13797. [2018-12-03 15:16:48,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13797 states. [2018-12-03 15:16:48,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13797 states to 13797 states and 20617 transitions. [2018-12-03 15:16:48,662 INFO L78 Accepts]: Start accepts. Automaton has 13797 states and 20617 transitions. Word has length 42 [2018-12-03 15:16:48,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:16:48,662 INFO L480 AbstractCegarLoop]: Abstraction has 13797 states and 20617 transitions. [2018-12-03 15:16:48,662 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-12-03 15:16:48,662 INFO L276 IsEmpty]: Start isEmpty. Operand 13797 states and 20617 transitions. [2018-12-03 15:16:48,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 15:16:48,669 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:16:48,669 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:16:48,669 INFO L423 AbstractCegarLoop]: === Iteration 93 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:16:48,669 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:16:48,670 INFO L82 PathProgramCache]: Analyzing trace with hash -483072842, now seen corresponding path program 1 times [2018-12-03 15:16:48,670 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:16:48,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:16:48,670 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:16:48,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:16:48,670 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:16:48,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:16:48,890 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 8 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:16:48,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:16:48,890 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:16:48,891 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 43 with the following transitions: [2018-12-03 15:16:48,891 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [25], [27], [29], [32], [38], [41], [65], [66], [67], [70], [72] [2018-12-03 15:16:48,892 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:16:48,892 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:16:48,903 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:16:48,903 INFO L272 AbstractInterpreter]: Visited 18 different actions 49 times. Merged at 15 different actions 24 times. Widened at 1 different actions 1 times. Found 12 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 15:16:48,906 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:16:48,906 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:16:48,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:16:48,906 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 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:16:48,914 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:16:48,914 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:16:48,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:16:48,927 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:16:49,068 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 13 proven. 74 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 15:16:49,069 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:16:49,276 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 9 proven. 78 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 15:16:49,294 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:16:49,294 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 12, 12] total 36 [2018-12-03 15:16:49,294 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:16:49,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 15:16:49,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 15:16:49,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1192, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 15:16:49,295 INFO L87 Difference]: Start difference. First operand 13797 states and 20617 transitions. Second operand 26 states. [2018-12-03 15:17:08,587 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 31 [2018-12-03 15:17:24,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:17:24,261 INFO L93 Difference]: Finished difference Result 21219 states and 31561 transitions. [2018-12-03 15:17:24,262 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 157 states. [2018-12-03 15:17:24,262 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 42 [2018-12-03 15:17:24,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:17:24,280 INFO L225 Difference]: With dead ends: 21219 [2018-12-03 15:17:24,281 INFO L226 Difference]: Without dead ends: 21217 [2018-12-03 15:17:24,285 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11995 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=7192, Invalid=27590, Unknown=0, NotChecked=0, Total=34782 [2018-12-03 15:17:24,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21217 states. [2018-12-03 15:17:34,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21217 to 14305. [2018-12-03 15:17:34,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14305 states. [2018-12-03 15:17:34,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14305 states to 14305 states and 21398 transitions. [2018-12-03 15:17:34,989 INFO L78 Accepts]: Start accepts. Automaton has 14305 states and 21398 transitions. Word has length 42 [2018-12-03 15:17:34,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:17:34,989 INFO L480 AbstractCegarLoop]: Abstraction has 14305 states and 21398 transitions. [2018-12-03 15:17:34,989 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 15:17:34,990 INFO L276 IsEmpty]: Start isEmpty. Operand 14305 states and 21398 transitions. [2018-12-03 15:17:34,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 15:17:34,997 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:17:34,997 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:17:34,997 INFO L423 AbstractCegarLoop]: === Iteration 94 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:17:34,997 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:17:34,997 INFO L82 PathProgramCache]: Analyzing trace with hash 1371594221, now seen corresponding path program 1 times [2018-12-03 15:17:34,997 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:17:34,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:17:34,998 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:17:34,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:17:34,998 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:17:35,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:17:35,140 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 59 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 15:17:35,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:17:35,140 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:17:35,140 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 43 with the following transitions: [2018-12-03 15:17:35,140 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [25], [27], [29], [32], [38], [41], [56], [57], [58], [61], [63], [65], [67], [70], [72] [2018-12-03 15:17:35,141 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:17:35,141 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:17:35,155 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:17:35,156 INFO L272 AbstractInterpreter]: Visited 22 different actions 59 times. Merged at 18 different actions 26 times. Widened at 1 different actions 1 times. Found 18 fixpoints after 10 different actions. Largest state had 0 variables. [2018-12-03 15:17:35,191 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:17:35,191 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:17:35,191 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:17:35,191 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 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:17:35,210 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:17:35,211 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:17:35,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:17:35,237 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:17:35,936 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-12-03 15:17:36,351 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 12 proven. 49 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 15:17:36,351 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:17:36,549 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 7 proven. 54 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 15:17:36,567 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:17:36,567 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 30 [2018-12-03 15:17:36,567 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:17:36,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 15:17:36,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 15:17:36,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=814, Unknown=0, NotChecked=0, Total=930 [2018-12-03 15:17:36,568 INFO L87 Difference]: Start difference. First operand 14305 states and 21398 transitions. Second operand 20 states. [2018-12-03 15:18:11,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:18:11,922 INFO L93 Difference]: Finished difference Result 35597 states and 53521 transitions. [2018-12-03 15:18:11,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2018-12-03 15:18:11,923 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2018-12-03 15:18:11,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:18:11,957 INFO L225 Difference]: With dead ends: 35597 [2018-12-03 15:18:11,957 INFO L226 Difference]: Without dead ends: 35595 [2018-12-03 15:18:11,963 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5785 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=2914, Invalid=15992, Unknown=0, NotChecked=0, Total=18906 [2018-12-03 15:18:11,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35595 states. [2018-12-03 15:18:24,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35595 to 16616. [2018-12-03 15:18:24,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16616 states. [2018-12-03 15:18:24,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16616 states to 16616 states and 24984 transitions. [2018-12-03 15:18:24,749 INFO L78 Accepts]: Start accepts. Automaton has 16616 states and 24984 transitions. Word has length 42 [2018-12-03 15:18:24,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:18:24,749 INFO L480 AbstractCegarLoop]: Abstraction has 16616 states and 24984 transitions. [2018-12-03 15:18:24,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 15:18:24,749 INFO L276 IsEmpty]: Start isEmpty. Operand 16616 states and 24984 transitions. [2018-12-03 15:18:24,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-12-03 15:18:24,755 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:18:24,755 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:18:24,755 INFO L423 AbstractCegarLoop]: === Iteration 95 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:18:24,755 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:18:24,755 INFO L82 PathProgramCache]: Analyzing trace with hash -937555222, now seen corresponding path program 2 times [2018-12-03 15:18:24,755 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:18:24,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:18:24,756 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:18:24,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:18:24,756 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:18:24,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:18:25,090 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 2 proven. 40 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-12-03 15:18:25,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:18:25,090 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:18:25,091 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:18:25,091 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:18:25,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:18:25,091 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 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:18:25,100 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:18:25,100 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:18:25,115 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 15:18:25,116 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:18:25,118 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:18:25,426 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 17 proven. 22 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-03 15:18:25,426 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:18:25,624 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 1 proven. 38 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-03 15:18:25,642 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:18:25,643 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 11] total 33 [2018-12-03 15:18:25,643 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:18:25,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 15:18:25,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 15:18:25,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1000, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 15:18:25,644 INFO L87 Difference]: Start difference. First operand 16616 states and 24984 transitions. Second operand 24 states. [2018-12-03 15:18:56,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:18:56,970 INFO L93 Difference]: Finished difference Result 29385 states and 44369 transitions. [2018-12-03 15:18:56,971 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2018-12-03 15:18:56,971 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 43 [2018-12-03 15:18:56,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:18:56,997 INFO L225 Difference]: With dead ends: 29385 [2018-12-03 15:18:56,997 INFO L226 Difference]: Without dead ends: 29383 [2018-12-03 15:18:57,002 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3457 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1797, Invalid=11085, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 15:18:57,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29383 states. [2018-12-03 15:19:10,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29383 to 18384. [2018-12-03 15:19:10,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18384 states. [2018-12-03 15:19:10,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18384 states to 18384 states and 27655 transitions. [2018-12-03 15:19:10,662 INFO L78 Accepts]: Start accepts. Automaton has 18384 states and 27655 transitions. Word has length 43 [2018-12-03 15:19:10,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:19:10,662 INFO L480 AbstractCegarLoop]: Abstraction has 18384 states and 27655 transitions. [2018-12-03 15:19:10,662 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 15:19:10,662 INFO L276 IsEmpty]: Start isEmpty. Operand 18384 states and 27655 transitions. [2018-12-03 15:19:10,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-12-03 15:19:10,669 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:19:10,669 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 6, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1] [2018-12-03 15:19:10,670 INFO L423 AbstractCegarLoop]: === Iteration 96 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:19:10,670 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:19:10,670 INFO L82 PathProgramCache]: Analyzing trace with hash -640486478, now seen corresponding path program 5 times [2018-12-03 15:19:10,670 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:19:10,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:19:10,671 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:19:10,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:19:10,671 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:19:10,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:19:10,986 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 2 proven. 142 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-12-03 15:19:10,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:19:10,987 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:19:10,987 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:19:10,987 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:19:10,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:19:10,987 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 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:19:10,997 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:19:10,998 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:19:11,009 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-12-03 15:19:11,010 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:19:11,011 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:19:11,229 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 99 proven. 23 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-12-03 15:19:11,229 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:19:11,389 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 87 proven. 35 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-12-03 15:19:11,411 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:19:11,411 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 11] total 28 [2018-12-03 15:19:11,411 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:19:11,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-03 15:19:11,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-03 15:19:11,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=725, Unknown=0, NotChecked=0, Total=812 [2018-12-03 15:19:11,412 INFO L87 Difference]: Start difference. First operand 18384 states and 27655 transitions. Second operand 25 states. [2018-12-03 15:19:28,183 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 47 [2018-12-03 15:19:57,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:19:57,004 INFO L93 Difference]: Finished difference Result 34013 states and 51363 transitions. [2018-12-03 15:19:57,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 210 states. [2018-12-03 15:19:57,005 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 46 [2018-12-03 15:19:57,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:19:57,036 INFO L225 Difference]: With dead ends: 34013 [2018-12-03 15:19:57,036 INFO L226 Difference]: Without dead ends: 34011 [2018-12-03 15:19:57,043 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 142 SyntacticMatches, 7 SemanticMatches, 229 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20053 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=5525, Invalid=47605, Unknown=0, NotChecked=0, Total=53130 [2018-12-03 15:19:57,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34011 states. [2018-12-03 15:20:08,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34011 to 10570. [2018-12-03 15:20:08,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10570 states. [2018-12-03 15:20:08,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10570 states to 10570 states and 15748 transitions. [2018-12-03 15:20:08,423 INFO L78 Accepts]: Start accepts. Automaton has 10570 states and 15748 transitions. Word has length 46 [2018-12-03 15:20:08,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:20:08,423 INFO L480 AbstractCegarLoop]: Abstraction has 10570 states and 15748 transitions. [2018-12-03 15:20:08,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-03 15:20:08,423 INFO L276 IsEmpty]: Start isEmpty. Operand 10570 states and 15748 transitions. [2018-12-03 15:20:08,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-12-03 15:20:08,429 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:20:08,429 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 15:20:08,430 INFO L423 AbstractCegarLoop]: === Iteration 97 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:20:08,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:20:08,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1516949158, now seen corresponding path program 3 times [2018-12-03 15:20:08,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:20:08,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:20:08,430 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:20:08,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:20:08,431 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:20:08,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:20:08,666 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 3 proven. 58 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-12-03 15:20:08,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:20:08,666 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:20:08,666 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:20:08,666 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:20:08,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:20:08,666 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 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:20:08,674 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:20:08,675 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:20:08,688 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:20:08,689 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:20:08,690 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:20:08,877 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 34 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-03 15:20:08,877 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:20:09,029 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 35 proven. 4 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-03 15:20:09,047 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:20:09,047 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10, 9] total 28 [2018-12-03 15:20:09,047 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:20:09,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 15:20:09,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 15:20:09,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2018-12-03 15:20:09,048 INFO L87 Difference]: Start difference. First operand 10570 states and 15748 transitions. Second operand 23 states. [2018-12-03 15:20:37,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:20:37,684 INFO L93 Difference]: Finished difference Result 26824 states and 39857 transitions. [2018-12-03 15:20:37,684 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2018-12-03 15:20:37,685 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 49 [2018-12-03 15:20:37,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:20:37,699 INFO L225 Difference]: With dead ends: 26824 [2018-12-03 15:20:37,699 INFO L226 Difference]: Without dead ends: 17110 [2018-12-03 15:20:37,708 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 5380 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=2049, Invalid=14721, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 15:20:37,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17110 states. [2018-12-03 15:20:49,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17110 to 11026. [2018-12-03 15:20:49,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11026 states. [2018-12-03 15:20:49,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11026 states to 11026 states and 16504 transitions. [2018-12-03 15:20:49,936 INFO L78 Accepts]: Start accepts. Automaton has 11026 states and 16504 transitions. Word has length 49 [2018-12-03 15:20:49,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:20:49,936 INFO L480 AbstractCegarLoop]: Abstraction has 11026 states and 16504 transitions. [2018-12-03 15:20:49,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 15:20:49,936 INFO L276 IsEmpty]: Start isEmpty. Operand 11026 states and 16504 transitions. [2018-12-03 15:20:49,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-12-03 15:20:49,941 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:20:49,941 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1] [2018-12-03 15:20:49,941 INFO L423 AbstractCegarLoop]: === Iteration 98 === [productErr3ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT, productErr2ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:20:49,941 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:20:49,942 INFO L82 PathProgramCache]: Analyzing trace with hash 1086529259, now seen corresponding path program 5 times [2018-12-03 15:20:49,942 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:20:49,942 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:20:49,942 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:20:49,942 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:20:49,942 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:20:49,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:20:50,143 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 138 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-12-03 15:20:50,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:20:50,144 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:20:50,144 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:20:50,144 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:20:50,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:20:50,145 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 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:20:50,157 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:20:50,158 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:20:50,173 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-12-03 15:20:50,173 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:20:50,174 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:20:50,595 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 13 proven. 132 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-12-03 15:20:50,595 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:20:51,022 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 25 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-12-03 15:20:51,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:20:51,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 15] total 45 [2018-12-03 15:20:51,040 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:20:51,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 15:20:51,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 15:20:51,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1862, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 15:20:51,041 INFO L87 Difference]: Start difference. First operand 11026 states and 16504 transitions. Second operand 32 states. [2018-12-03 15:21:19,021 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 63 [2018-12-03 15:21:48,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:21:48,041 INFO L93 Difference]: Finished difference Result 25461 states and 38736 transitions. [2018-12-03 15:21:48,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2018-12-03 15:21:48,042 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 49 [2018-12-03 15:21:48,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:21:48,064 INFO L225 Difference]: With dead ends: 25461 [2018-12-03 15:21:48,065 INFO L226 Difference]: Without dead ends: 25460 [2018-12-03 15:21:48,069 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5269 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=6610, Invalid=20122, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 15:21:48,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25460 states.