java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/jain_5.i_2.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 19:03:59,123 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 19:03:59,125 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 19:03:59,138 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 19:03:59,138 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 19:03:59,139 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 19:03:59,142 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 19:03:59,145 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 19:03:59,146 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 19:03:59,148 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 19:03:59,149 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-03 19:03:59,149 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-03 19:03:59,150 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-03 19:03:59,151 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-03 19:03:59,152 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-03 19:03:59,153 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-03 19:03:59,154 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-03 19:03:59,156 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-03 19:03:59,158 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-03 19:03:59,162 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-03 19:03:59,163 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-03 19:03:59,167 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-03 19:03:59,172 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-03 19:03:59,173 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-03 19:03:59,173 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-03 19:03:59,177 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-03 19:03:59,178 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-03 19:03:59,179 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-03 19:03:59,183 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-03 19:03:59,184 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-03 19:03:59,184 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-03 19:03:59,185 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-03 19:03:59,185 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-03 19:03:59,185 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-03 19:03:59,186 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-03 19:03:59,189 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-03 19:03:59,190 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf [2018-12-03 19:03:59,214 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 19:03:59,214 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 19:03:59,218 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 19:03:59,218 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 19:03:59,218 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 19:03:59,219 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 19:03:59,219 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 19:03:59,219 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 19:03:59,219 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 19:03:59,219 INFO L133 SettingsManager]: * Underlying domain=OctagonDomain [2018-12-03 19:03:59,220 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 19:03:59,220 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 19:03:59,220 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 19:03:59,220 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 19:03:59,221 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 19:03:59,221 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 19:03:59,222 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 19:03:59,222 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 19:03:59,222 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 19:03:59,222 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 19:03:59,222 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 19:03:59,224 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 19:03:59,224 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 19:03:59,225 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 19:03:59,225 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 19:03:59,225 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 19:03:59,225 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 19:03:59,225 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 19:03:59,226 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 19:03:59,226 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 19:03:59,226 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 19:03:59,226 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 19:03:59,227 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 19:03:59,227 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 19:03:59,227 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 19:03:59,227 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 19:03:59,227 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 19:03:59,228 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 19:03:59,228 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 19:03:59,228 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 19:03:59,279 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 19:03:59,292 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 19:03:59,299 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 19:03:59,301 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 19:03:59,301 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 19:03:59,302 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/jain_5.i_2.bpl [2018-12-03 19:03:59,303 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/jain_5.i_2.bpl' [2018-12-03 19:03:59,343 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 19:03:59,344 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 19:03:59,345 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 19:03:59,345 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 19:03:59,346 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 19:03:59,363 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "jain_5.i_2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:03:59" (1/1) ... [2018-12-03 19:03:59,373 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "jain_5.i_2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:03:59" (1/1) ... [2018-12-03 19:03:59,381 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 19:03:59,382 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 19:03:59,382 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 19:03:59,382 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 19:03:59,394 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "jain_5.i_2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:03:59" (1/1) ... [2018-12-03 19:03:59,394 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "jain_5.i_2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:03:59" (1/1) ... [2018-12-03 19:03:59,395 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "jain_5.i_2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:03:59" (1/1) ... [2018-12-03 19:03:59,395 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "jain_5.i_2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:03:59" (1/1) ... [2018-12-03 19:03:59,399 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "jain_5.i_2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:03:59" (1/1) ... [2018-12-03 19:03:59,401 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "jain_5.i_2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:03:59" (1/1) ... [2018-12-03 19:03:59,401 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "jain_5.i_2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:03:59" (1/1) ... [2018-12-03 19:03:59,403 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 19:03:59,404 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 19:03:59,404 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 19:03:59,404 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 19:03:59,405 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "jain_5.i_2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:03:59" (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 19:03:59,476 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 19:03:59,477 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 19:03:59,705 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 19:03:59,705 INFO L280 CfgBuilder]: Removed 1 assue(true) statements. [2018-12-03 19:03:59,706 INFO L202 PluginConnector]: Adding new model jain_5.i_2.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 07:03:59 BoogieIcfgContainer [2018-12-03 19:03:59,706 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 19:03:59,707 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 19:03:59,707 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 19:03:59,710 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 19:03:59,711 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "jain_5.i_2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:03:59" (1/2) ... [2018-12-03 19:03:59,712 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e7496eb and model type jain_5.i_2.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 07:03:59, skipping insertion in model container [2018-12-03 19:03:59,712 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "jain_5.i_2.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 07:03:59" (2/2) ... [2018-12-03 19:03:59,714 INFO L112 eAbstractionObserver]: Analyzing ICFG jain_5.i_2.bpl [2018-12-03 19:03:59,724 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 19:03:59,735 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 19:03:59,755 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 19:03:59,796 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 19:03:59,796 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 19:03:59,796 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 19:03:59,796 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 19:03:59,796 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 19:03:59,797 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 19:03:59,797 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 19:03:59,797 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 19:03:59,815 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-12-03 19:03:59,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-03 19:03:59,832 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:03:59,838 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-03 19:03:59,841 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:03:59,852 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:03:59,853 INFO L82 PathProgramCache]: Analyzing trace with hash 925701, now seen corresponding path program 1 times [2018-12-03 19:03:59,855 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:03:59,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:03:59,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:03:59,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:03:59,913 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:03:59,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:00,092 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 19:04:00,095 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 19:04:00,096 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 19:04:00,096 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 19:04:00,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 19:04:00,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 19:04:00,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 19:04:00,133 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 4 states. [2018-12-03 19:04:00,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:04:00,260 INFO L93 Difference]: Finished difference Result 12 states and 13 transitions. [2018-12-03 19:04:00,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 19:04:00,262 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2018-12-03 19:04:00,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:04:00,273 INFO L225 Difference]: With dead ends: 12 [2018-12-03 19:04:00,273 INFO L226 Difference]: Without dead ends: 8 [2018-12-03 19:04:00,278 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 19:04:00,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-12-03 19:04:00,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2018-12-03 19:04:00,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 19:04:00,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-12-03 19:04:00,315 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-12-03 19:04:00,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:04:00,315 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-12-03 19:04:00,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 19:04:00,316 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-12-03 19:04:00,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 19:04:00,316 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:04:00,316 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-12-03 19:04:00,316 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:04:00,317 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:04:00,317 INFO L82 PathProgramCache]: Analyzing trace with hash 889531649, now seen corresponding path program 1 times [2018-12-03 19:04:00,317 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:04:00,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:00,318 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:04:00,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:00,319 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:04:00,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:00,570 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 19:04:00,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:00,571 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:04:00,571 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2018-12-03 19:04:00,573 INFO L205 CegarAbsIntRunner]: [0], [2], [6], [8], [10] [2018-12-03 19:04:00,637 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 19:04:00,638 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 19:04:00,725 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-12-03 19:04:00,988 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 19:04:00,991 INFO L272 AbstractInterpreter]: Visited 5 different actions 35 times. Merged at 4 different actions 27 times. Widened at 3 different actions 11 times. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 19:04:01,043 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:04:01,045 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 19:04:01,045 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:01,045 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 19:04:01,060 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:04:01,061 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:04:01,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:01,091 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:04:01,350 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 10 [2018-12-03 19:04:01,569 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 19:04:01,570 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:04:01,691 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 19:04:01,711 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:04:01,711 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 12 [2018-12-03 19:04:01,711 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:04:01,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 19:04:01,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 19:04:01,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2018-12-03 19:04:01,713 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 10 states. [2018-12-03 19:04:01,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:04:01,886 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2018-12-03 19:04:01,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 19:04:01,887 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 6 [2018-12-03 19:04:01,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:04:01,887 INFO L225 Difference]: With dead ends: 12 [2018-12-03 19:04:01,887 INFO L226 Difference]: Without dead ends: 10 [2018-12-03 19:04:01,889 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2018-12-03 19:04:01,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-12-03 19:04:01,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 9. [2018-12-03 19:04:01,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 19:04:01,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-12-03 19:04:01,894 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-12-03 19:04:01,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:04:01,894 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-12-03 19:04:01,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 19:04:01,895 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-12-03 19:04:01,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 19:04:01,895 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:04:01,896 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-12-03 19:04:01,896 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:04:01,896 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:04:01,897 INFO L82 PathProgramCache]: Analyzing trace with hash 141355773, now seen corresponding path program 2 times [2018-12-03 19:04:01,897 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:04:01,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:01,898 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:04:01,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:01,899 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:04:01,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:02,154 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:02,154 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:02,154 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:04:02,155 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:04:02,155 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:04:02,155 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:02,155 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 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 19:04:02,165 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:04:02,165 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:04:02,177 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 19:04:02,177 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:04:02,179 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:04:02,389 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:02,389 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:04:02,799 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:02,818 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:04:02,818 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 15 [2018-12-03 19:04:02,818 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:04:02,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 19:04:02,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 19:04:02,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2018-12-03 19:04:02,883 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 12 states. [2018-12-03 19:04:02,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:04:02,969 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-12-03 19:04:02,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 19:04:02,970 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 8 [2018-12-03 19:04:02,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:04:02,970 INFO L225 Difference]: With dead ends: 14 [2018-12-03 19:04:02,970 INFO L226 Difference]: Without dead ends: 12 [2018-12-03 19:04:02,971 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=72, Invalid=200, Unknown=0, NotChecked=0, Total=272 [2018-12-03 19:04:02,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-12-03 19:04:02,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2018-12-03 19:04:02,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-12-03 19:04:02,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-12-03 19:04:02,975 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-12-03 19:04:02,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:04:02,975 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-12-03 19:04:02,975 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 19:04:02,975 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-12-03 19:04:02,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 19:04:02,976 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:04:02,976 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-12-03 19:04:02,976 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:04:02,976 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:04:02,976 INFO L82 PathProgramCache]: Analyzing trace with hash -1596122631, now seen corresponding path program 3 times [2018-12-03 19:04:02,976 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:04:02,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:02,978 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:04:02,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:02,978 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:04:02,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:03,169 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 19:04:03,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:03,170 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:04:03,170 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:04:03,170 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:04:03,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:03,170 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 19:04:03,180 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:04:03,180 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:04:03,192 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:04:03,192 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:04:03,194 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:04:03,410 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 19:04:03,411 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:04:03,537 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 19:04:03,556 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:04:03,557 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 18 [2018-12-03 19:04:03,557 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:04:03,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 19:04:03,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 19:04:03,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2018-12-03 19:04:03,558 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 14 states. [2018-12-03 19:04:03,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:04:03,723 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-12-03 19:04:03,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 19:04:03,725 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 10 [2018-12-03 19:04:03,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:04:03,725 INFO L225 Difference]: With dead ends: 16 [2018-12-03 19:04:03,726 INFO L226 Difference]: Without dead ends: 14 [2018-12-03 19:04:03,726 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=101, Invalid=319, Unknown=0, NotChecked=0, Total=420 [2018-12-03 19:04:03,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-12-03 19:04:03,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2018-12-03 19:04:03,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-12-03 19:04:03,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-12-03 19:04:03,731 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-12-03 19:04:03,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:04:03,734 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-12-03 19:04:03,734 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 19:04:03,735 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-12-03 19:04:03,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 19:04:03,735 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:04:03,735 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-12-03 19:04:03,735 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:04:03,736 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:04:03,736 INFO L82 PathProgramCache]: Analyzing trace with hash -570590731, now seen corresponding path program 4 times [2018-12-03 19:04:03,736 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:04:03,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:03,738 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:04:03,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:03,738 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:04:03,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:03,948 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:03,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:03,949 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:04:03,949 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:04:03,949 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:04:03,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:03,949 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 19:04:03,958 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:04:03,959 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:04:03,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:03,984 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:04:04,129 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:04,129 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:04:04,429 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:04,451 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:04:04,451 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 21 [2018-12-03 19:04:04,451 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:04:04,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 19:04:04,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 19:04:04,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2018-12-03 19:04:04,452 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 16 states. [2018-12-03 19:04:04,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:04:04,628 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-12-03 19:04:04,629 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 19:04:04,629 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 12 [2018-12-03 19:04:04,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:04:04,630 INFO L225 Difference]: With dead ends: 18 [2018-12-03 19:04:04,630 INFO L226 Difference]: Without dead ends: 16 [2018-12-03 19:04:04,631 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=136, Invalid=464, Unknown=0, NotChecked=0, Total=600 [2018-12-03 19:04:04,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-12-03 19:04:04,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-12-03 19:04:04,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 19:04:04,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-12-03 19:04:04,635 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-12-03 19:04:04,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:04:04,636 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-12-03 19:04:04,636 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 19:04:04,636 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-12-03 19:04:04,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 19:04:04,637 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:04:04,637 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-12-03 19:04:04,638 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:04:04,638 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:04:04,638 INFO L82 PathProgramCache]: Analyzing trace with hash 1418054385, now seen corresponding path program 5 times [2018-12-03 19:04:04,638 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:04:04,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:04,639 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:04:04,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:04,640 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:04:04,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:04,895 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:04,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:04,896 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:04:04,896 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:04:04,896 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:04:04,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:04,896 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 19:04:04,906 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:04:04,906 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:04:04,938 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 19:04:04,938 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:04:04,942 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:04:05,124 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:05,125 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:04:05,322 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:05,342 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:04:05,342 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 24 [2018-12-03 19:04:05,343 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:04:05,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 19:04:05,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 19:04:05,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2018-12-03 19:04:05,344 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 18 states. [2018-12-03 19:04:05,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:04:05,510 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-12-03 19:04:05,510 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 19:04:05,510 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 14 [2018-12-03 19:04:05,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:04:05,511 INFO L225 Difference]: With dead ends: 20 [2018-12-03 19:04:05,511 INFO L226 Difference]: Without dead ends: 18 [2018-12-03 19:04:05,512 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=177, Invalid=635, Unknown=0, NotChecked=0, Total=812 [2018-12-03 19:04:05,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-12-03 19:04:05,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-12-03 19:04:05,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-03 19:04:05,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-12-03 19:04:05,517 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-12-03 19:04:05,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:04:05,517 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-12-03 19:04:05,517 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 19:04:05,517 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-12-03 19:04:05,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 19:04:05,518 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:04:05,518 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-12-03 19:04:05,518 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:04:05,518 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:04:05,519 INFO L82 PathProgramCache]: Analyzing trace with hash 1245564141, now seen corresponding path program 6 times [2018-12-03 19:04:05,519 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:04:05,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:05,519 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:04:05,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:05,520 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:04:05,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:05,733 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:05,733 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:05,733 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:04:05,734 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:04:05,734 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:04:05,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:05,734 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 19:04:05,744 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:04:05,744 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:04:05,765 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:04:05,766 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:04:05,768 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:04:06,054 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:06,055 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:04:06,372 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:06,393 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:04:06,393 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 27 [2018-12-03 19:04:06,393 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:04:06,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 19:04:06,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 19:04:06,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=606, Unknown=0, NotChecked=0, Total=756 [2018-12-03 19:04:06,395 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 20 states. [2018-12-03 19:04:06,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:04:06,669 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-12-03 19:04:06,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 19:04:06,669 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 16 [2018-12-03 19:04:06,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:04:06,670 INFO L225 Difference]: With dead ends: 22 [2018-12-03 19:04:06,670 INFO L226 Difference]: Without dead ends: 20 [2018-12-03 19:04:06,671 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=220, Invalid=836, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 19:04:06,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-12-03 19:04:06,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2018-12-03 19:04:06,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 19:04:06,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-12-03 19:04:06,676 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-12-03 19:04:06,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:04:06,677 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-12-03 19:04:06,677 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 19:04:06,677 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-12-03 19:04:06,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 19:04:06,678 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:04:06,678 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-12-03 19:04:06,678 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:04:06,678 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:04:06,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1308803095, now seen corresponding path program 7 times [2018-12-03 19:04:06,679 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:04:06,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:06,680 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:04:06,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:06,680 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:04:06,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:06,926 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:06,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:06,927 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:04:06,927 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:04:06,927 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:04:06,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:06,928 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 19:04:06,938 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:04:06,938 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:04:06,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:06,966 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:04:07,361 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:07,362 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:04:08,149 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:08,168 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:04:08,168 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 30 [2018-12-03 19:04:08,168 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:04:08,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 19:04:08,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 19:04:08,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=753, Unknown=0, NotChecked=0, Total=930 [2018-12-03 19:04:08,172 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 22 states. [2018-12-03 19:04:08,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:04:08,695 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-12-03 19:04:08,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 19:04:08,696 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 18 [2018-12-03 19:04:08,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:04:08,696 INFO L225 Difference]: With dead ends: 24 [2018-12-03 19:04:08,696 INFO L226 Difference]: Without dead ends: 22 [2018-12-03 19:04:08,697 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=267, Invalid=1065, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 19:04:08,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-03 19:04:08,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-12-03 19:04:08,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 19:04:08,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-12-03 19:04:08,703 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-12-03 19:04:08,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:04:08,703 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-12-03 19:04:08,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 19:04:08,704 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-12-03 19:04:08,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 19:04:08,704 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:04:08,704 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-12-03 19:04:08,705 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:04:08,705 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:04:08,705 INFO L82 PathProgramCache]: Analyzing trace with hash 665576421, now seen corresponding path program 8 times [2018-12-03 19:04:08,705 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:04:08,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:08,706 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:04:08,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:08,706 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:04:08,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:09,041 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:09,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:09,041 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:04:09,041 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:04:09,042 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:04:09,042 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:09,042 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:04:09,050 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:04:09,050 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:04:29,834 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 19:04:29,834 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:04:29,853 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:04:30,311 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:30,311 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:04:30,763 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:30,783 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:04:30,784 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 33 [2018-12-03 19:04:30,784 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:04:30,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 19:04:30,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 19:04:30,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=914, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 19:04:30,785 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 24 states. [2018-12-03 19:04:31,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:04:31,207 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-12-03 19:04:31,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 19:04:31,208 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 20 [2018-12-03 19:04:31,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:04:31,209 INFO L225 Difference]: With dead ends: 26 [2018-12-03 19:04:31,209 INFO L226 Difference]: Without dead ends: 24 [2018-12-03 19:04:31,211 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=320, Invalid=1320, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 19:04:31,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-12-03 19:04:31,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2018-12-03 19:04:31,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-12-03 19:04:31,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-12-03 19:04:31,217 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-12-03 19:04:31,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:04:31,218 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-12-03 19:04:31,218 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 19:04:31,218 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-12-03 19:04:31,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-12-03 19:04:31,219 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:04:31,219 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-12-03 19:04:31,219 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:04:31,219 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:04:31,219 INFO L82 PathProgramCache]: Analyzing trace with hash -331253535, now seen corresponding path program 9 times [2018-12-03 19:04:31,219 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:04:31,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:31,220 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:04:31,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:31,220 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:04:31,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:31,639 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:31,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:31,640 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:04:31,640 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:04:31,640 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:04:31,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:31,640 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 19:04:31,652 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:04:31,652 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:04:31,669 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:04:31,670 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:04:31,672 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:04:31,908 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:31,908 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:04:38,352 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 88 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:38,376 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:04:38,377 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 36 [2018-12-03 19:04:38,377 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:04:38,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 19:04:38,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 19:04:38,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=1086, Unknown=3, NotChecked=0, Total=1332 [2018-12-03 19:04:38,378 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 26 states. [2018-12-03 19:04:38,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:04:38,717 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-12-03 19:04:38,718 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 19:04:38,718 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 22 [2018-12-03 19:04:38,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:04:38,719 INFO L225 Difference]: With dead ends: 28 [2018-12-03 19:04:38,719 INFO L226 Difference]: Without dead ends: 26 [2018-12-03 19:04:38,720 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=379, Invalid=1598, Unknown=3, NotChecked=0, Total=1980 [2018-12-03 19:04:38,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-12-03 19:04:38,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2018-12-03 19:04:38,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 19:04:38,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-12-03 19:04:38,726 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-12-03 19:04:38,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:04:38,726 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-12-03 19:04:38,726 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 19:04:38,727 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-12-03 19:04:38,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 19:04:38,727 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:04:38,727 INFO L402 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1] [2018-12-03 19:04:38,728 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:04:38,728 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:04:38,728 INFO L82 PathProgramCache]: Analyzing trace with hash -507134243, now seen corresponding path program 10 times [2018-12-03 19:04:38,728 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:04:38,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:38,729 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:04:38,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:38,729 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:04:38,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:39,060 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-12-03 19:04:39,705 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:39,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:39,706 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:04:39,706 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:04:39,706 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:04:39,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:39,706 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 19:04:39,723 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:04:39,723 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:04:39,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:39,745 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:04:40,041 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:40,042 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:04:43,922 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:43,940 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:04:43,941 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 39 [2018-12-03 19:04:43,941 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:04:43,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-12-03 19:04:43,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-12-03 19:04:43,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=1281, Unknown=1, NotChecked=0, Total=1560 [2018-12-03 19:04:43,942 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 28 states. [2018-12-03 19:04:44,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:04:44,333 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-12-03 19:04:44,333 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 19:04:44,333 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 24 [2018-12-03 19:04:44,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:04:44,334 INFO L225 Difference]: With dead ends: 30 [2018-12-03 19:04:44,334 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 19:04:44,336 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 501 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=440, Invalid=1911, Unknown=1, NotChecked=0, Total=2352 [2018-12-03 19:04:44,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 19:04:44,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-12-03 19:04:44,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 19:04:44,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-12-03 19:04:44,343 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-12-03 19:04:44,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:04:44,344 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-12-03 19:04:44,344 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-12-03 19:04:44,344 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-12-03 19:04:44,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 19:04:44,345 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:04:44,345 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1] [2018-12-03 19:04:44,345 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:04:44,345 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:04:44,346 INFO L82 PathProgramCache]: Analyzing trace with hash -2024770087, now seen corresponding path program 11 times [2018-12-03 19:04:44,346 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:04:44,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:44,346 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:04:44,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:44,347 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:04:44,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:44,693 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-12-03 19:04:44,855 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:04:44,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:44,856 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:04:44,856 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:04:44,856 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:04:44,856 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:44,856 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 19:04:44,866 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:04:44,866 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:05:40,995 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-03 19:05:40,996 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:05:41,030 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:05:41,365 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:05:41,366 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:05:49,980 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 130 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:05:50,000 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:05:50,000 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 42 [2018-12-03 19:05:50,000 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:05:50,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-12-03 19:05:50,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-12-03 19:05:50,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=315, Invalid=1487, Unknown=4, NotChecked=0, Total=1806 [2018-12-03 19:05:50,003 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 30 states. [2018-12-03 19:05:50,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:05:50,815 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-12-03 19:05:50,816 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 19:05:50,816 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 26 [2018-12-03 19:05:50,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:05:50,816 INFO L225 Difference]: With dead ends: 32 [2018-12-03 19:05:50,816 INFO L226 Difference]: Without dead ends: 30 [2018-12-03 19:05:50,818 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=505, Invalid=2247, Unknown=4, NotChecked=0, Total=2756 [2018-12-03 19:05:50,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-12-03 19:05:50,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-12-03 19:05:50,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-12-03 19:05:50,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-12-03 19:05:50,826 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-12-03 19:05:50,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:05:50,826 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-12-03 19:05:50,827 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-12-03 19:05:50,827 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-12-03 19:05:50,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-12-03 19:05:50,828 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:05:50,828 INFO L402 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1] [2018-12-03 19:05:50,828 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:05:50,828 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:05:50,828 INFO L82 PathProgramCache]: Analyzing trace with hash -183935531, now seen corresponding path program 12 times [2018-12-03 19:05:50,829 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:05:50,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:05:50,829 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:05:50,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:05:50,830 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:05:50,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:05:51,139 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-12-03 19:05:51,453 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:05:51,454 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:05:51,454 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:05:51,454 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:05:51,454 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:05:51,454 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:05:51,454 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 19:05:51,466 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:05:51,466 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:05:51,491 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:05:51,491 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:05:51,494 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:05:51,899 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:05:51,899 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:06:00,623 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 154 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:06:00,641 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:06:00,642 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 45 [2018-12-03 19:06:00,642 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:06:00,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 19:06:00,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 19:06:00,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=1710, Unknown=4, NotChecked=0, Total=2070 [2018-12-03 19:06:00,643 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 32 states. [2018-12-03 19:06:01,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:06:01,130 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-12-03 19:06:01,131 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 19:06:01,131 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 28 [2018-12-03 19:06:01,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:06:01,132 INFO L225 Difference]: With dead ends: 34 [2018-12-03 19:06:01,132 INFO L226 Difference]: Without dead ends: 32 [2018-12-03 19:06:01,133 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 685 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=576, Invalid=2612, Unknown=4, NotChecked=0, Total=3192 [2018-12-03 19:06:01,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-12-03 19:06:01,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2018-12-03 19:06:01,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 19:06:01,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-12-03 19:06:01,142 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-12-03 19:06:01,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:06:01,142 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-12-03 19:06:01,142 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 19:06:01,142 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-12-03 19:06:01,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 19:06:01,143 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:06:01,143 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1] [2018-12-03 19:06:01,143 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:06:01,144 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:06:01,144 INFO L82 PathProgramCache]: Analyzing trace with hash -668453167, now seen corresponding path program 13 times [2018-12-03 19:06:01,144 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:06:01,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:06:01,145 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:06:01,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:06:01,145 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:06:01,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:06:01,478 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:06:01,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:06:01,479 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:06:01,479 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:06:01,479 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:06:01,479 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:06:01,479 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 19:06:01,490 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:06:01,490 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:06:01,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:06:01,513 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:06:02,381 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:06:02,381 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:06:11,467 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 180 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:06:11,487 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:06:11,487 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 48 [2018-12-03 19:06:11,487 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:06:11,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-12-03 19:06:11,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-12-03 19:06:11,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=401, Invalid=1947, Unknown=4, NotChecked=0, Total=2352 [2018-12-03 19:06:11,489 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 34 states. [2018-12-03 19:06:12,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:06:12,854 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-12-03 19:06:12,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 19:06:12,855 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 30 [2018-12-03 19:06:12,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:06:12,855 INFO L225 Difference]: With dead ends: 36 [2018-12-03 19:06:12,855 INFO L226 Difference]: Without dead ends: 34 [2018-12-03 19:06:12,858 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 788 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=653, Invalid=3003, Unknown=4, NotChecked=0, Total=3660 [2018-12-03 19:06:12,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-12-03 19:06:12,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-12-03 19:06:12,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-03 19:06:12,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-12-03 19:06:12,867 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-12-03 19:06:12,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:06:12,867 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-12-03 19:06:12,868 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-12-03 19:06:12,868 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-12-03 19:06:12,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 19:06:12,868 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:06:12,868 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1] [2018-12-03 19:06:12,869 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:06:12,869 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:06:12,869 INFO L82 PathProgramCache]: Analyzing trace with hash 1861533901, now seen corresponding path program 14 times [2018-12-03 19:06:12,869 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:06:12,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:06:12,870 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:06:12,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:06:12,870 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:06:12,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:06:13,905 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:06:13,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:06:13,905 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:06:13,905 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:06:13,905 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:06:13,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:06:13,905 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 19:06:13,921 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:06:13,921 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:06:20,562 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-03 19:06:20,563 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:06:20,592 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:06:21,015 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:06:21,016 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:06:30,204 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 209 refuted. 1 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:06:30,222 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:06:30,223 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 51 [2018-12-03 19:06:30,223 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:06:30,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-12-03 19:06:30,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-12-03 19:06:30,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=446, Invalid=2202, Unknown=4, NotChecked=0, Total=2652 [2018-12-03 19:06:30,224 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 36 states. [2018-12-03 19:06:31,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:06:31,202 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-12-03 19:06:31,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 19:06:31,203 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 32 [2018-12-03 19:06:31,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:06:31,204 INFO L225 Difference]: With dead ends: 38 [2018-12-03 19:06:31,204 INFO L226 Difference]: Without dead ends: 36 [2018-12-03 19:06:31,206 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 897 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=732, Invalid=3424, Unknown=4, NotChecked=0, Total=4160 [2018-12-03 19:06:31,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-12-03 19:06:31,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-12-03 19:06:31,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-12-03 19:06:31,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-12-03 19:06:31,213 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-12-03 19:06:31,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:06:31,214 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-12-03 19:06:31,214 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-12-03 19:06:31,214 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-12-03 19:06:31,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-12-03 19:06:31,214 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:06:31,215 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1] [2018-12-03 19:06:31,215 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:06:31,215 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:06:31,215 INFO L82 PathProgramCache]: Analyzing trace with hash -2067350583, now seen corresponding path program 15 times [2018-12-03 19:06:31,215 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:06:31,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:06:31,216 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:06:31,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:06:31,216 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:06:31,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:06:31,554 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-12-03 19:06:31,954 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:06:31,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:06:31,954 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:06:31,954 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:06:31,954 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:06:31,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:06:31,955 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 19:06:31,963 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:06:31,964 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:06:31,987 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:06:31,988 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:06:31,991 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:06:32,486 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:06:32,486 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:06:37,906 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 239 refuted. 1 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:06:37,925 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:06:37,925 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 54 [2018-12-03 19:06:37,926 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:06:37,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 19:06:37,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 19:06:37,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=493, Invalid=2475, Unknown=2, NotChecked=0, Total=2970 [2018-12-03 19:06:37,929 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 38 states. [2018-12-03 19:06:38,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:06:38,948 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-12-03 19:06:38,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 19:06:38,949 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 34 [2018-12-03 19:06:38,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:06:38,949 INFO L225 Difference]: With dead ends: 40 [2018-12-03 19:06:38,949 INFO L226 Difference]: Without dead ends: 38 [2018-12-03 19:06:38,951 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1015 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=815, Invalid=3875, Unknown=2, NotChecked=0, Total=4692 [2018-12-03 19:06:38,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-12-03 19:06:38,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2018-12-03 19:06:38,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 19:06:38,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-12-03 19:06:38,961 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-12-03 19:06:38,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:06:38,961 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-12-03 19:06:38,961 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 19:06:38,961 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-12-03 19:06:38,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-12-03 19:06:38,962 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:06:38,962 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1] [2018-12-03 19:06:38,962 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:06:38,963 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:06:38,963 INFO L82 PathProgramCache]: Analyzing trace with hash 1845880773, now seen corresponding path program 16 times [2018-12-03 19:06:38,963 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:06:38,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:06:38,963 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:06:38,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:06:38,964 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:06:38,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:06:39,298 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-12-03 19:06:40,304 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:06:40,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:06:40,305 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:06:40,305 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:06:40,305 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:06:40,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:06:40,305 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 19:06:40,316 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:06:40,316 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:06:40,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:06:40,347 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:06:41,246 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:06:41,247 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:06:53,331 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 271 refuted. 1 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:06:53,349 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:06:53,349 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 57 [2018-12-03 19:06:53,350 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:06:53,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-12-03 19:06:53,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-12-03 19:06:53,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=544, Invalid=2757, Unknown=5, NotChecked=0, Total=3306 [2018-12-03 19:06:53,352 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 40 states. [2018-12-03 19:06:54,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:06:54,289 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-12-03 19:06:54,290 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 19:06:54,290 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 36 [2018-12-03 19:06:54,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:06:54,291 INFO L225 Difference]: With dead ends: 42 [2018-12-03 19:06:54,291 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 19:06:54,294 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1140 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=904, Invalid=4347, Unknown=5, NotChecked=0, Total=5256 [2018-12-03 19:06:54,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 19:06:54,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-12-03 19:06:54,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 19:06:54,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-12-03 19:06:54,305 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-12-03 19:06:54,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:06:54,305 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-12-03 19:06:54,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-12-03 19:06:54,305 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-12-03 19:06:54,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 19:06:54,306 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:06:54,306 INFO L402 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1] [2018-12-03 19:06:54,306 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:06:54,306 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:06:54,306 INFO L82 PathProgramCache]: Analyzing trace with hash 69862593, now seen corresponding path program 17 times [2018-12-03 19:06:54,306 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:06:54,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:06:54,307 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:06:54,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:06:54,307 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:06:54,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:06:54,785 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:06:54,785 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:06:54,785 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:06:54,785 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:06:54,785 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:06:54,785 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:06:54,786 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 19:06:54,797 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:06:54,797 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:08:15,151 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-03 19:08:15,152 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:08:15,387 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:08:15,950 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:08:15,951 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:08:30,567 WARN L180 SmtUtils]: Spent 709.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-12-03 19:08:30,572 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 303 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:08:30,591 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:08:30,592 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 60 [2018-12-03 19:08:30,592 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:08:30,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-12-03 19:08:30,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-12-03 19:08:30,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=599, Invalid=3055, Unknown=6, NotChecked=0, Total=3660 [2018-12-03 19:08:30,594 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 42 states. [2018-12-03 19:08:31,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:08:31,652 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-12-03 19:08:31,652 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-03 19:08:31,653 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 38 [2018-12-03 19:08:31,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:08:31,653 INFO L225 Difference]: With dead ends: 44 [2018-12-03 19:08:31,653 INFO L226 Difference]: Without dead ends: 42 [2018-12-03 19:08:31,655 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1272 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=999, Invalid=4847, Unknown=6, NotChecked=0, Total=5852 [2018-12-03 19:08:31,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-12-03 19:08:31,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-12-03 19:08:31,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-12-03 19:08:31,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-12-03 19:08:31,665 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-12-03 19:08:31,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:08:31,665 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-12-03 19:08:31,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-12-03 19:08:31,665 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-12-03 19:08:31,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-12-03 19:08:31,666 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:08:31,666 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1] [2018-12-03 19:08:31,666 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:08:31,667 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:08:31,667 INFO L82 PathProgramCache]: Analyzing trace with hash -1581591875, now seen corresponding path program 18 times [2018-12-03 19:08:31,667 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:08:31,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:31,669 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:08:31,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:31,669 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:08:31,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:32,003 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-12-03 19:08:32,675 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:08:32,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:32,675 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:08:32,675 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:08:32,675 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:08:32,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:32,676 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 19:08:32,685 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:08:32,685 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:08:32,713 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:08:32,713 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:08:32,716 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:08:33,361 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:08:33,361 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:08:53,846 WARN L180 SmtUtils]: Spent 1.48 s on a formula simplification that was a NOOP. DAG size: 15 [2018-12-03 19:08:53,849 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 339 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:08:53,867 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:08:53,868 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 63 [2018-12-03 19:08:53,868 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:08:53,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 19:08:53,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 19:08:53,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=654, Invalid=3370, Unknown=8, NotChecked=0, Total=4032 [2018-12-03 19:08:53,869 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 44 states. [2018-12-03 19:08:55,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:08:55,010 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-12-03 19:08:55,016 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 19:08:55,016 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 40 [2018-12-03 19:08:55,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:08:55,016 INFO L225 Difference]: With dead ends: 46 [2018-12-03 19:08:55,017 INFO L226 Difference]: Without dead ends: 44 [2018-12-03 19:08:55,017 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1411 ImplicationChecksByTransitivity, 22.3s TimeCoverageRelationStatistics Valid=1096, Invalid=5376, Unknown=8, NotChecked=0, Total=6480 [2018-12-03 19:08:55,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-12-03 19:08:55,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2018-12-03 19:08:55,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-12-03 19:08:55,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-12-03 19:08:55,026 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2018-12-03 19:08:55,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:08:55,027 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-12-03 19:08:55,027 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 19:08:55,027 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-12-03 19:08:55,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 19:08:55,027 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:08:55,027 INFO L402 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1] [2018-12-03 19:08:55,028 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:08:55,028 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:08:55,028 INFO L82 PathProgramCache]: Analyzing trace with hash 508563897, now seen corresponding path program 19 times [2018-12-03 19:08:55,028 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:08:55,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:55,029 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:08:55,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:55,029 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:08:55,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:55,340 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-12-03 19:08:56,107 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:08:56,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:56,108 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:08:56,108 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:08:56,108 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:08:56,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:56,108 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 19:08:56,117 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:08:56,117 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:08:56,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:56,152 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:08:56,789 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:08:56,789 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:09:14,195 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 377 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:09:14,215 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:09:14,215 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 66 [2018-12-03 19:09:14,215 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:09:14,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-12-03 19:09:14,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-12-03 19:09:14,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=711, Invalid=3704, Unknown=7, NotChecked=0, Total=4422 [2018-12-03 19:09:14,218 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 46 states. [2018-12-03 19:09:15,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:09:15,290 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-12-03 19:09:15,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 19:09:15,291 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 42 [2018-12-03 19:09:15,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:09:15,292 INFO L225 Difference]: With dead ends: 48 [2018-12-03 19:09:15,292 INFO L226 Difference]: Without dead ends: 46 [2018-12-03 19:09:15,293 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1557 ImplicationChecksByTransitivity, 19.3s TimeCoverageRelationStatistics Valid=1197, Invalid=5936, Unknown=7, NotChecked=0, Total=7140 [2018-12-03 19:09:15,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-12-03 19:09:15,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-12-03 19:09:15,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 19:09:15,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-12-03 19:09:15,308 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2018-12-03 19:09:15,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:09:15,309 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-12-03 19:09:15,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-12-03 19:09:15,309 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-12-03 19:09:15,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 19:09:15,309 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:09:15,310 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1] [2018-12-03 19:09:15,310 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:09:15,310 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:09:15,310 INFO L82 PathProgramCache]: Analyzing trace with hash -896433739, now seen corresponding path program 20 times [2018-12-03 19:09:15,310 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:09:15,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:09:15,311 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:09:15,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:09:15,311 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:09:15,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:09:15,847 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:09:15,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:09:15,847 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:09:15,847 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:09:15,847 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:09:15,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:09:15,847 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 19:09:15,857 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:09:15,857 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:11:44,591 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-12-03 19:11:44,591 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:11:44,672 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:11:45,403 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:11:45,403 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:12:07,354 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 418 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:12:07,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:12:07,361 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 69 [2018-12-03 19:12:07,361 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:12:07,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-12-03 19:12:07,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-12-03 19:12:07,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=772, Invalid=4049, Unknown=9, NotChecked=0, Total=4830 [2018-12-03 19:12:07,363 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 48 states. [2018-12-03 19:12:08,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:12:08,693 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-12-03 19:12:08,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 19:12:08,693 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 44 [2018-12-03 19:12:08,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:12:08,694 INFO L225 Difference]: With dead ends: 50 [2018-12-03 19:12:08,694 INFO L226 Difference]: Without dead ends: 48 [2018-12-03 19:12:08,695 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1710 ImplicationChecksByTransitivity, 23.5s TimeCoverageRelationStatistics Valid=1304, Invalid=6519, Unknown=9, NotChecked=0, Total=7832 [2018-12-03 19:12:08,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-12-03 19:12:08,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-12-03 19:12:08,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-12-03 19:12:08,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-12-03 19:12:08,707 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2018-12-03 19:12:08,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:12:08,707 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-12-03 19:12:08,707 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-12-03 19:12:08,707 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-12-03 19:12:08,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-12-03 19:12:08,708 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:12:08,708 INFO L402 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1] [2018-12-03 19:12:08,708 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:12:08,708 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:12:08,708 INFO L82 PathProgramCache]: Analyzing trace with hash 1815536305, now seen corresponding path program 21 times [2018-12-03 19:12:08,708 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:12:08,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:12:08,709 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:12:08,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:12:08,709 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:12:08,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:12:09,335 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:12:09,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:12:09,336 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:12:09,336 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:12:09,336 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:12:09,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:12:09,336 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 19:12:09,351 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:12:09,351 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:12:09,388 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:12:09,388 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:12:09,393 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:12:10,755 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:12:10,755 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:12:35,878 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 458 refuted. 4 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:12:35,897 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:12:35,897 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 72 [2018-12-03 19:12:35,897 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:12:35,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 19:12:35,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 19:12:35,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=837, Invalid=4408, Unknown=11, NotChecked=0, Total=5256 [2018-12-03 19:12:35,899 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 50 states. [2018-12-03 19:12:37,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:12:37,120 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-12-03 19:12:37,123 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 19:12:37,123 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 46 [2018-12-03 19:12:37,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:12:37,124 INFO L225 Difference]: With dead ends: 52 [2018-12-03 19:12:37,124 INFO L226 Difference]: Without dead ends: 50 [2018-12-03 19:12:37,125 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1871 ImplicationChecksByTransitivity, 27.3s TimeCoverageRelationStatistics Valid=1417, Invalid=7128, Unknown=11, NotChecked=0, Total=8556 [2018-12-03 19:12:37,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-12-03 19:12:37,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2018-12-03 19:12:37,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 19:12:37,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-12-03 19:12:37,140 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2018-12-03 19:12:37,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:12:37,140 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-12-03 19:12:37,140 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 19:12:37,141 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-12-03 19:12:37,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 19:12:37,141 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:12:37,141 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1] [2018-12-03 19:12:37,141 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:12:37,142 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:12:37,142 INFO L82 PathProgramCache]: Analyzing trace with hash 973599917, now seen corresponding path program 22 times [2018-12-03 19:12:37,142 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:12:37,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:12:37,143 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:12:37,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:12:37,143 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:12:37,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:12:37,484 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-12-03 19:12:37,984 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:12:37,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:12:37,984 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:12:37,984 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:12:37,985 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:12:37,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:12:37,985 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 19:12:37,995 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:12:37,995 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:12:38,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:12:38,037 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:12:38,878 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:12:38,878 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:13:14,282 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 501 refuted. 5 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:13:14,300 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:13:14,300 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 75 [2018-12-03 19:13:14,300 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:13:14,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-12-03 19:13:14,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-12-03 19:13:14,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=902, Invalid=4783, Unknown=15, NotChecked=0, Total=5700 [2018-12-03 19:13:14,302 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 52 states. [2018-12-03 19:13:15,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:13:15,933 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-12-03 19:13:15,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 19:13:15,934 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 48 [2018-12-03 19:13:15,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:13:15,934 INFO L225 Difference]: With dead ends: 54 [2018-12-03 19:13:15,935 INFO L226 Difference]: Without dead ends: 52 [2018-12-03 19:13:15,936 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2040 ImplicationChecksByTransitivity, 37.4s TimeCoverageRelationStatistics Valid=1532, Invalid=7765, Unknown=15, NotChecked=0, Total=9312 [2018-12-03 19:13:15,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-03 19:13:15,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-12-03 19:13:15,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 19:13:15,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-12-03 19:13:15,954 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2018-12-03 19:13:15,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:13:15,954 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-12-03 19:13:15,954 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-12-03 19:13:15,954 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-12-03 19:13:15,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 19:13:15,955 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:13:15,955 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1] [2018-12-03 19:13:15,955 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:13:15,955 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:13:15,956 INFO L82 PathProgramCache]: Analyzing trace with hash -673417303, now seen corresponding path program 23 times [2018-12-03 19:13:15,956 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:13:15,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:13:15,957 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:13:15,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:13:15,957 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:13:15,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:13:16,293 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-12-03 19:13:16,748 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:13:16,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:13:16,748 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:13:16,749 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:13:16,749 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:13:16,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:13:16,749 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 19:13:16,757 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:13:16,757 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:16:48,539 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 19:16:48,539 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:16:49,121 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:16:50,219 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:16:50,219 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:17:32,704 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 548 refuted. 4 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:17:32,714 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:17:32,714 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 78 [2018-12-03 19:17:32,714 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:17:32,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-12-03 19:17:32,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-12-03 19:17:32,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=969, Invalid=5174, Unknown=19, NotChecked=0, Total=6162 [2018-12-03 19:17:32,716 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 54 states. [2018-12-03 19:17:34,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:17:34,218 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-12-03 19:17:34,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-03 19:17:34,218 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 50 [2018-12-03 19:17:34,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:17:34,219 INFO L225 Difference]: With dead ends: 56 [2018-12-03 19:17:34,219 INFO L226 Difference]: Without dead ends: 54 [2018-12-03 19:17:34,220 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2215 ImplicationChecksByTransitivity, 44.7s TimeCoverageRelationStatistics Valid=1651, Invalid=8430, Unknown=19, NotChecked=0, Total=10100 [2018-12-03 19:17:34,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-12-03 19:17:34,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-12-03 19:17:34,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-12-03 19:17:34,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-12-03 19:17:34,235 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2018-12-03 19:17:34,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:17:34,236 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-12-03 19:17:34,236 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-12-03 19:17:34,236 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-12-03 19:17:34,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-12-03 19:17:34,237 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:17:34,237 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 1, 1, 1] [2018-12-03 19:17:34,237 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:17:34,237 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:17:34,237 INFO L82 PathProgramCache]: Analyzing trace with hash 1385966501, now seen corresponding path program 24 times [2018-12-03 19:17:34,237 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:17:34,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:17:34,238 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:17:34,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:17:34,239 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:17:34,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:17:34,882 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:17:34,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:17:34,882 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:17:34,882 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:17:34,883 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:17:34,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:17:34,883 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 19:17:34,893 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:17:34,894 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:17:34,938 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:17:34,938 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:17:34,941 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:17:35,944 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:17:35,944 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:18:00,644 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 595 refuted. 5 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:18:00,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:18:00,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 81 [2018-12-03 19:18:00,666 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:18:00,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-12-03 19:18:00,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-12-03 19:18:00,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1040, Invalid=5592, Unknown=10, NotChecked=0, Total=6642 [2018-12-03 19:18:00,667 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 56 states. [2018-12-03 19:18:02,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:18:02,350 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-12-03 19:18:02,350 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 19:18:02,350 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 52 [2018-12-03 19:18:02,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:18:02,351 INFO L225 Difference]: With dead ends: 58 [2018-12-03 19:18:02,351 INFO L226 Difference]: Without dead ends: 56 [2018-12-03 19:18:02,352 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2398 ImplicationChecksByTransitivity, 26.7s TimeCoverageRelationStatistics Valid=1776, Invalid=9134, Unknown=10, NotChecked=0, Total=10920 [2018-12-03 19:18:02,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-12-03 19:18:02,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2018-12-03 19:18:02,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-03 19:18:02,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-12-03 19:18:02,370 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2018-12-03 19:18:02,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:18:02,371 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-12-03 19:18:02,371 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-12-03 19:18:02,371 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-12-03 19:18:02,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 19:18:02,371 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:18:02,372 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 1, 1, 1] [2018-12-03 19:18:02,372 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:18:02,372 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:18:02,372 INFO L82 PathProgramCache]: Analyzing trace with hash 473878689, now seen corresponding path program 25 times [2018-12-03 19:18:02,372 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:18:02,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:18:02,373 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:18:02,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:18:02,373 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:18:02,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:18:03,064 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:18:03,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:18:03,064 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:18:03,064 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:18:03,064 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:18:03,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:18:03,065 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 19:18:03,083 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:18:03,083 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:18:03,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:18:03,127 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:18:04,172 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:18:04,173 INFO L316 TraceCheckSpWp]: Computing backward predicates...