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/up.i_4.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 19:23:25,171 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 19:23:25,173 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 19:23:25,187 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 19:23:25,188 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 19:23:25,189 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 19:23:25,190 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 19:23:25,193 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 19:23:25,194 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 19:23:25,195 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 19:23:25,197 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-03 19:23:25,198 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-03 19:23:25,199 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-03 19:23:25,200 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-03 19:23:25,201 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-03 19:23:25,202 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-03 19:23:25,203 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-03 19:23:25,205 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-03 19:23:25,207 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-03 19:23:25,216 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-03 19:23:25,217 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-03 19:23:25,218 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-03 19:23:25,222 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-12-03 19:23:25,230 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 19:23:25,251 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 19:23:25,251 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 19:23:25,252 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 19:23:25,252 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 19:23:25,252 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 19:23:25,253 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 19:23:25,253 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 19:23:25,253 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 19:23:25,253 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 19:23:25,253 INFO L133 SettingsManager]: * Underlying domain=OctagonDomain [2018-12-03 19:23:25,253 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 19:23:25,254 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 19:23:25,254 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 19:23:25,254 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 19:23:25,255 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 19:23:25,258 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 19:23:25,258 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 19:23:25,258 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 19:23:25,258 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 19:23:25,258 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 19:23:25,259 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 19:23:25,259 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 19:23:25,259 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 19:23:25,259 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 19:23:25,259 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 19:23:25,262 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 19:23:25,262 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 19:23:25,262 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 19:23:25,262 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 19:23:25,263 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 19:23:25,263 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 19:23:25,263 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 19:23:25,263 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 19:23:25,263 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 19:23:25,264 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 19:23:25,264 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 19:23:25,264 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 19:23:25,264 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 19:23:25,264 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 19:23:25,265 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 19:23:25,302 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 19:23:25,315 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 19:23:25,319 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 19:23:25,321 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 19:23:25,322 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 19:23:25,323 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/up.i_4.bpl [2018-12-03 19:23:25,323 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/up.i_4.bpl' [2018-12-03 19:23:25,362 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 19:23:25,364 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 19:23:25,365 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 19:23:25,365 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 19:23:25,365 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 19:23:25,383 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:23:25" (1/1) ... [2018-12-03 19:23:25,392 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:23:25" (1/1) ... [2018-12-03 19:23:25,401 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 19:23:25,402 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 19:23:25,402 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 19:23:25,402 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 19:23:25,414 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:23:25" (1/1) ... [2018-12-03 19:23:25,415 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:23:25" (1/1) ... [2018-12-03 19:23:25,415 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:23:25" (1/1) ... [2018-12-03 19:23:25,416 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:23:25" (1/1) ... [2018-12-03 19:23:25,419 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:23:25" (1/1) ... [2018-12-03 19:23:25,421 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:23:25" (1/1) ... [2018-12-03 19:23:25,422 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:23:25" (1/1) ... [2018-12-03 19:23:25,424 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 19:23:25,424 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 19:23:25,424 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 19:23:25,425 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 19:23:25,426 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:23:25" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 19:23:25,498 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 19:23:25,499 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 19:23:25,780 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 19:23:25,780 INFO L280 CfgBuilder]: Removed 2 assue(true) statements. [2018-12-03 19:23:25,783 INFO L202 PluginConnector]: Adding new model up.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 07:23:25 BoogieIcfgContainer [2018-12-03 19:23:25,783 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 19:23:25,784 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 19:23:25,784 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 19:23:25,788 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 19:23:25,788 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:23:25" (1/2) ... [2018-12-03 19:23:25,790 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@141cfe3e and model type up.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 07:23:25, skipping insertion in model container [2018-12-03 19:23:25,790 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 07:23:25" (2/2) ... [2018-12-03 19:23:25,792 INFO L112 eAbstractionObserver]: Analyzing ICFG up.i_4.bpl [2018-12-03 19:23:25,803 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 19:23:25,813 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 19:23:25,831 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 19:23:25,864 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 19:23:25,864 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 19:23:25,864 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 19:23:25,864 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 19:23:25,864 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 19:23:25,865 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 19:23:25,867 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 19:23:25,867 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 19:23:25,883 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states. [2018-12-03 19:23:25,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-03 19:23:25,890 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:25,891 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-12-03 19:23:25,893 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:25,900 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:25,900 INFO L82 PathProgramCache]: Analyzing trace with hash 28787237, now seen corresponding path program 1 times [2018-12-03 19:23:25,903 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:25,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:25,952 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:25,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:25,952 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:25,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:26,121 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 19:23:26,124 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 19:23:26,124 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 19:23:26,125 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 19:23:26,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 19:23:26,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 19:23:26,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 19:23:26,160 INFO L87 Difference]: Start difference. First operand 8 states. Second operand 4 states. [2018-12-03 19:23:26,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:26,289 INFO L93 Difference]: Finished difference Result 14 states and 17 transitions. [2018-12-03 19:23:26,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 19:23:26,291 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 5 [2018-12-03 19:23:26,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:26,304 INFO L225 Difference]: With dead ends: 14 [2018-12-03 19:23:26,304 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 19:23:26,308 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-12-03 19:23:26,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 19:23:26,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 19:23:26,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 19:23:26,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2018-12-03 19:23:26,344 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 5 [2018-12-03 19:23:26,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:26,344 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2018-12-03 19:23:26,344 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 19:23:26,345 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2018-12-03 19:23:26,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 19:23:26,345 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:26,345 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-12-03 19:23:26,346 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:26,346 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:26,346 INFO L82 PathProgramCache]: Analyzing trace with hash 894126414, now seen corresponding path program 1 times [2018-12-03 19:23:26,346 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:26,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:26,348 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:26,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:26,348 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:26,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:26,583 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:26,584 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 19:23:26,584 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-12-03 19:23:26,585 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 19:23:26,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 19:23:26,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 19:23:26,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-12-03 19:23:26,587 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand 5 states. [2018-12-03 19:23:26,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:26,735 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2018-12-03 19:23:26,736 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 19:23:26,736 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 6 [2018-12-03 19:23:26,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:26,737 INFO L225 Difference]: With dead ends: 15 [2018-12-03 19:23:26,737 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 19:23:26,738 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2018-12-03 19:23:26,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 19:23:26,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 9. [2018-12-03 19:23:26,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 19:23:26,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2018-12-03 19:23:26,742 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2018-12-03 19:23:26,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:26,743 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2018-12-03 19:23:26,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 19:23:26,743 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2018-12-03 19:23:26,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 19:23:26,744 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:26,744 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2018-12-03 19:23:26,744 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:26,745 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:26,745 INFO L82 PathProgramCache]: Analyzing trace with hash 261957866, now seen corresponding path program 1 times [2018-12-03 19:23:26,745 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:26,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:26,746 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:26,747 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:26,747 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:26,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:26,830 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:26,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:26,831 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:26,832 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 9 with the following transitions: [2018-12-03 19:23:26,833 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9], [13], [15], [17] [2018-12-03 19:23:26,890 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 19:23:26,890 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 19:23:27,408 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 19:23:27,410 INFO L272 AbstractInterpreter]: Visited 7 different actions 64 times. Merged at 6 different actions 49 times. Widened at 5 different actions 24 times. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 19:23:27,449 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:27,451 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 19:23:27,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:27,452 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 19:23:27,470 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:27,470 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:23:27,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:27,509 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:27,834 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:27,835 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:27,900 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:27,920 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:27,921 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2018-12-03 19:23:27,921 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:27,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 19:23:27,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 19:23:27,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-12-03 19:23:27,922 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 8 states. [2018-12-03 19:23:28,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:28,113 INFO L93 Difference]: Finished difference Result 17 states and 19 transitions. [2018-12-03 19:23:28,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 19:23:28,113 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 8 [2018-12-03 19:23:28,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:28,114 INFO L225 Difference]: With dead ends: 17 [2018-12-03 19:23:28,114 INFO L226 Difference]: Without dead ends: 10 [2018-12-03 19:23:28,115 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2018-12-03 19:23:28,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-12-03 19:23:28,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-12-03 19:23:28,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-12-03 19:23:28,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2018-12-03 19:23:28,119 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 8 [2018-12-03 19:23:28,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:28,119 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2018-12-03 19:23:28,119 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 19:23:28,120 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2018-12-03 19:23:28,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 19:23:28,120 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:28,120 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2018-12-03 19:23:28,121 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:28,121 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:28,121 INFO L82 PathProgramCache]: Analyzing trace with hash 1187669281, now seen corresponding path program 2 times [2018-12-03 19:23:28,122 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:28,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:28,123 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:28,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:28,123 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:28,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:28,387 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:28,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:28,387 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:28,387 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:28,388 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:28,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:28,388 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 19:23:28,402 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:23:28,402 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:23:28,435 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-12-03 19:23:28,436 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:28,437 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:28,465 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:28,465 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:28,532 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:28,557 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:28,557 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 7 [2018-12-03 19:23:28,557 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:28,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 19:23:28,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 19:23:28,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-12-03 19:23:28,559 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand 8 states. [2018-12-03 19:23:28,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:28,660 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2018-12-03 19:23:28,661 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 19:23:28,661 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 9 [2018-12-03 19:23:28,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:28,662 INFO L225 Difference]: With dead ends: 18 [2018-12-03 19:23:28,662 INFO L226 Difference]: Without dead ends: 16 [2018-12-03 19:23:28,662 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 13 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2018-12-03 19:23:28,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-12-03 19:23:28,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 12. [2018-12-03 19:23:28,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-12-03 19:23:28,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2018-12-03 19:23:28,667 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 9 [2018-12-03 19:23:28,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:28,667 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2018-12-03 19:23:28,667 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 19:23:28,667 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2018-12-03 19:23:28,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-12-03 19:23:28,668 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:28,668 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2018-12-03 19:23:28,668 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:28,668 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:28,669 INFO L82 PathProgramCache]: Analyzing trace with hash -1111188483, now seen corresponding path program 3 times [2018-12-03 19:23:28,669 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:28,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:28,670 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:28,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:28,670 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:28,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:28,875 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:28,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:28,876 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:28,876 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:28,877 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:28,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:28,877 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 19:23:28,896 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:23:28,896 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:23:28,937 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:23:28,937 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:28,939 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:29,159 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:29,160 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:29,254 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:29,274 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:29,274 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 10 [2018-12-03 19:23:29,274 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:29,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 19:23:29,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 19:23:29,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2018-12-03 19:23:29,276 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 11 states. [2018-12-03 19:23:29,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:29,408 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2018-12-03 19:23:29,408 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 19:23:29,408 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 11 [2018-12-03 19:23:29,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:29,409 INFO L225 Difference]: With dead ends: 22 [2018-12-03 19:23:29,409 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 19:23:29,410 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 13 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2018-12-03 19:23:29,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 19:23:29,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-12-03 19:23:29,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-12-03 19:23:29,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-12-03 19:23:29,413 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2018-12-03 19:23:29,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:29,414 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-12-03 19:23:29,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 19:23:29,414 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-12-03 19:23:29,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 19:23:29,415 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:29,415 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1] [2018-12-03 19:23:29,415 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:29,415 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:29,415 INFO L82 PathProgramCache]: Analyzing trace with hash -1227431834, now seen corresponding path program 4 times [2018-12-03 19:23:29,416 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:29,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:29,417 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:29,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:29,417 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:29,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:29,541 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:29,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:29,541 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:29,541 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:29,542 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:29,542 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:29,542 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 19:23:29,552 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:29,552 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:23:29,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:29,648 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:29,695 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:29,696 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:29,732 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:29,751 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:29,752 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 8 [2018-12-03 19:23:29,752 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:29,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 19:23:29,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 19:23:29,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-12-03 19:23:29,753 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 9 states. [2018-12-03 19:23:29,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:29,904 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2018-12-03 19:23:29,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 19:23:29,905 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 12 [2018-12-03 19:23:29,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:29,905 INFO L225 Difference]: With dead ends: 21 [2018-12-03 19:23:29,906 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 19:23:29,906 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 6 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2018-12-03 19:23:29,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 19:23:29,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2018-12-03 19:23:29,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 19:23:29,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-12-03 19:23:29,910 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2018-12-03 19:23:29,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:29,910 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-12-03 19:23:29,911 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 19:23:29,911 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-12-03 19:23:29,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 19:23:29,911 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:29,911 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1] [2018-12-03 19:23:29,912 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:29,912 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:29,912 INFO L82 PathProgramCache]: Analyzing trace with hash 1553947138, now seen corresponding path program 5 times [2018-12-03 19:23:29,912 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:29,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:29,913 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:29,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:29,914 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:29,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:30,374 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:30,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:30,375 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:30,375 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:30,376 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:30,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:30,376 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 19:23:30,390 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:23:30,390 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:23:30,411 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 19:23:30,411 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:30,413 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:30,527 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:30,528 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:30,578 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:30,598 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:30,598 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2018-12-03 19:23:30,598 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:30,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 19:23:30,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 19:23:30,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2018-12-03 19:23:30,600 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 14 states. [2018-12-03 19:23:30,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:30,747 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2018-12-03 19:23:30,747 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 19:23:30,748 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2018-12-03 19:23:30,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:30,748 INFO L225 Difference]: With dead ends: 27 [2018-12-03 19:23:30,748 INFO L226 Difference]: Without dead ends: 16 [2018-12-03 19:23:30,749 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 16 SyntacticMatches, 7 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=91, Invalid=215, Unknown=0, NotChecked=0, Total=306 [2018-12-03 19:23:30,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-12-03 19:23:30,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-12-03 19:23:30,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-12-03 19:23:30,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-12-03 19:23:30,752 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2018-12-03 19:23:30,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:30,753 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-12-03 19:23:30,753 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 19:23:30,753 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-12-03 19:23:30,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-12-03 19:23:30,753 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:30,754 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1] [2018-12-03 19:23:30,754 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:30,754 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:30,754 INFO L82 PathProgramCache]: Analyzing trace with hash 291918073, now seen corresponding path program 6 times [2018-12-03 19:23:30,754 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:30,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:30,755 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:30,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:30,756 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:30,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:30,882 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:30,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:30,883 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:30,883 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:30,884 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:30,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:30,884 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 19:23:30,901 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:23:30,901 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:23:30,915 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:23:30,915 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:30,917 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:30,951 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:30,951 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:31,002 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:31,021 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:31,021 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 9 [2018-12-03 19:23:31,021 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:31,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 19:23:31,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 19:23:31,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-12-03 19:23:31,023 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 10 states. [2018-12-03 19:23:31,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:31,135 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2018-12-03 19:23:31,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 19:23:31,136 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 15 [2018-12-03 19:23:31,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:31,137 INFO L225 Difference]: With dead ends: 24 [2018-12-03 19:23:31,137 INFO L226 Difference]: Without dead ends: 22 [2018-12-03 19:23:31,138 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 8 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=79, Invalid=131, Unknown=0, NotChecked=0, Total=210 [2018-12-03 19:23:31,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-03 19:23:31,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 18. [2018-12-03 19:23:31,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-12-03 19:23:31,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-12-03 19:23:31,144 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 15 [2018-12-03 19:23:31,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:31,144 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-12-03 19:23:31,144 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 19:23:31,144 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-12-03 19:23:31,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-12-03 19:23:31,145 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:31,145 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1] [2018-12-03 19:23:31,145 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:31,146 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:31,146 INFO L82 PathProgramCache]: Analyzing trace with hash 1360327125, now seen corresponding path program 7 times [2018-12-03 19:23:31,146 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:31,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:31,147 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:31,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:31,147 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:31,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:31,304 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 20 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:31,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:31,305 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:31,305 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:31,305 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:31,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:31,306 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 19:23:31,317 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:31,317 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:23:31,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:31,341 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:31,496 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 20 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:31,497 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:31,574 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 20 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:31,596 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:31,597 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 16 [2018-12-03 19:23:31,597 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:31,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 19:23:31,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 19:23:31,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2018-12-03 19:23:31,598 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 17 states. [2018-12-03 19:23:31,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:31,785 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2018-12-03 19:23:31,785 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 19:23:31,786 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 17 [2018-12-03 19:23:31,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:31,787 INFO L225 Difference]: With dead ends: 32 [2018-12-03 19:23:31,787 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 19:23:31,788 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 19 SyntacticMatches, 9 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2018-12-03 19:23:31,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 19:23:31,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-12-03 19:23:31,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 19:23:31,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-12-03 19:23:31,792 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2018-12-03 19:23:31,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:31,793 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-12-03 19:23:31,793 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 19:23:31,793 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-12-03 19:23:31,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 19:23:31,794 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:31,794 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1] [2018-12-03 19:23:31,794 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:31,794 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:31,794 INFO L82 PathProgramCache]: Analyzing trace with hash -1898806402, now seen corresponding path program 8 times [2018-12-03 19:23:31,794 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:31,795 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:31,795 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:31,795 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:31,795 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:31,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:31,935 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:31,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:31,936 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:31,936 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:31,936 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:31,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:31,937 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 19:23:31,953 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:23:31,954 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:23:31,970 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-12-03 19:23:31,970 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:31,972 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:31,990 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:31,990 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:32,056 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:32,076 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:32,076 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 10 [2018-12-03 19:23:32,076 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:32,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 19:23:32,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 19:23:32,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2018-12-03 19:23:32,078 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 11 states. [2018-12-03 19:23:32,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:32,501 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2018-12-03 19:23:32,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 19:23:32,502 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2018-12-03 19:23:32,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:32,503 INFO L225 Difference]: With dead ends: 27 [2018-12-03 19:23:32,503 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 19:23:32,503 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 28 SyntacticMatches, 10 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=170, Unknown=0, NotChecked=0, Total=272 [2018-12-03 19:23:32,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 19:23:32,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 21. [2018-12-03 19:23:32,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 19:23:32,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-12-03 19:23:32,512 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2018-12-03 19:23:32,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:32,513 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-12-03 19:23:32,513 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 19:23:32,513 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-12-03 19:23:32,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 19:23:32,514 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:32,514 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1] [2018-12-03 19:23:32,514 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:32,514 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:32,515 INFO L82 PathProgramCache]: Analyzing trace with hash 608081690, now seen corresponding path program 9 times [2018-12-03 19:23:32,515 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:32,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:32,516 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:32,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:32,516 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:32,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:32,811 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:32,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:32,812 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:32,812 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:32,812 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:32,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:32,812 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 19:23:32,822 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:23:32,822 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:23:32,854 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:23:32,854 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:32,856 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:32,996 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:32,996 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:33,158 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:33,178 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:33,178 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 19 [2018-12-03 19:23:33,178 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:33,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 19:23:33,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 19:23:33,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2018-12-03 19:23:33,182 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 20 states. [2018-12-03 19:23:33,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:33,673 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2018-12-03 19:23:33,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 19:23:33,674 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 20 [2018-12-03 19:23:33,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:33,675 INFO L225 Difference]: With dead ends: 37 [2018-12-03 19:23:33,675 INFO L226 Difference]: Without dead ends: 22 [2018-12-03 19:23:33,676 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 22 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=178, Invalid=472, Unknown=0, NotChecked=0, Total=650 [2018-12-03 19:23:33,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-03 19:23:33,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-12-03 19:23:33,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-12-03 19:23:33,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-12-03 19:23:33,681 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 20 [2018-12-03 19:23:33,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:33,681 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-12-03 19:23:33,682 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 19:23:33,682 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-12-03 19:23:33,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 19:23:33,682 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:33,682 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1] [2018-12-03 19:23:33,683 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:33,683 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:33,683 INFO L82 PathProgramCache]: Analyzing trace with hash -208127791, now seen corresponding path program 10 times [2018-12-03 19:23:33,683 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:33,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:33,684 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:33,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:33,684 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:33,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:34,043 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:34,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:34,044 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:34,044 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:34,044 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:34,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:34,044 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 19:23:34,054 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:34,055 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:23:34,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:34,077 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:34,104 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:34,104 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:34,299 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:34,319 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:34,319 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 11 [2018-12-03 19:23:34,319 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:34,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 19:23:34,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 19:23:34,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2018-12-03 19:23:34,321 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 12 states. [2018-12-03 19:23:34,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:34,506 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2018-12-03 19:23:34,507 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 19:23:34,507 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2018-12-03 19:23:34,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:34,507 INFO L225 Difference]: With dead ends: 30 [2018-12-03 19:23:34,508 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 19:23:34,508 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 33 SyntacticMatches, 12 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=128, Invalid=214, Unknown=0, NotChecked=0, Total=342 [2018-12-03 19:23:34,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 19:23:34,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 24. [2018-12-03 19:23:34,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-03 19:23:34,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-12-03 19:23:34,514 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2018-12-03 19:23:34,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:34,515 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-12-03 19:23:34,515 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 19:23:34,515 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-12-03 19:23:34,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 19:23:34,516 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:34,516 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1] [2018-12-03 19:23:34,516 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:34,517 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:34,517 INFO L82 PathProgramCache]: Analyzing trace with hash 1852588973, now seen corresponding path program 11 times [2018-12-03 19:23:34,517 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:34,518 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:34,518 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:34,518 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:34,518 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:34,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:34,758 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:34,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:34,759 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:34,759 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:34,759 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:34,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:34,760 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 19:23:34,771 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:23:34,771 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:23:34,816 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-12-03 19:23:34,817 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:34,819 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:34,986 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:34,986 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:35,204 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:35,223 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:35,224 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 22 [2018-12-03 19:23:35,224 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:35,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 19:23:35,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 19:23:35,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-12-03 19:23:35,225 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 23 states. [2018-12-03 19:23:35,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:35,464 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2018-12-03 19:23:35,464 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 19:23:35,464 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 23 [2018-12-03 19:23:35,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:35,465 INFO L225 Difference]: With dead ends: 42 [2018-12-03 19:23:35,466 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 19:23:35,467 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 25 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=232, Invalid=638, Unknown=0, NotChecked=0, Total=870 [2018-12-03 19:23:35,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 19:23:35,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-12-03 19:23:35,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 19:23:35,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-12-03 19:23:35,472 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 23 [2018-12-03 19:23:35,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:35,473 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2018-12-03 19:23:35,473 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 19:23:35,473 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2018-12-03 19:23:35,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 19:23:35,474 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:35,474 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1] [2018-12-03 19:23:35,474 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:35,475 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:35,475 INFO L82 PathProgramCache]: Analyzing trace with hash -34196842, now seen corresponding path program 12 times [2018-12-03 19:23:35,475 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:35,476 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:35,476 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:35,476 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:35,476 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:35,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:35,651 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:35,652 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:35,652 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:35,652 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:35,652 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:35,652 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:35,652 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 19:23:35,663 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:23:35,663 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:23:35,682 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:23:35,682 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:35,684 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:35,712 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:35,713 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:35,798 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:35,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:35,817 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 12 [2018-12-03 19:23:35,817 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:35,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 19:23:35,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 19:23:35,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2018-12-03 19:23:35,818 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 13 states. [2018-12-03 19:23:35,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:35,986 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2018-12-03 19:23:35,986 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 19:23:35,987 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-12-03 19:23:35,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:35,988 INFO L225 Difference]: With dead ends: 33 [2018-12-03 19:23:35,988 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 19:23:35,989 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 38 SyntacticMatches, 14 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=157, Invalid=263, Unknown=0, NotChecked=0, Total=420 [2018-12-03 19:23:35,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 19:23:35,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 27. [2018-12-03 19:23:35,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 19:23:35,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-12-03 19:23:35,996 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2018-12-03 19:23:35,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:35,996 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-12-03 19:23:35,996 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 19:23:35,997 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-12-03 19:23:35,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 19:23:35,997 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:35,998 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1] [2018-12-03 19:23:35,998 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:35,998 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:35,998 INFO L82 PathProgramCache]: Analyzing trace with hash 1496506418, now seen corresponding path program 13 times [2018-12-03 19:23:35,998 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:35,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:35,999 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:36,000 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:36,000 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:36,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:36,330 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:36,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:36,330 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:36,331 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:36,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:36,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:36,331 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 19:23:36,341 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:36,341 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:23:36,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:36,363 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:36,526 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:36,526 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:36,663 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:36,682 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:36,682 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 25 [2018-12-03 19:23:36,683 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:36,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 19:23:36,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 19:23:36,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2018-12-03 19:23:36,684 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 26 states. [2018-12-03 19:23:37,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:37,059 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-12-03 19:23:37,059 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 19:23:37,059 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 26 [2018-12-03 19:23:37,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:37,060 INFO L225 Difference]: With dead ends: 47 [2018-12-03 19:23:37,060 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 19:23:37,061 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 28 SyntacticMatches, 15 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=293, Invalid=829, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 19:23:37,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 19:23:37,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-12-03 19:23:37,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-03 19:23:37,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-12-03 19:23:37,067 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 26 [2018-12-03 19:23:37,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:37,067 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-12-03 19:23:37,067 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 19:23:37,067 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-12-03 19:23:37,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-03 19:23:37,068 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:37,068 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1] [2018-12-03 19:23:37,068 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:37,069 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:37,069 INFO L82 PathProgramCache]: Analyzing trace with hash 497294505, now seen corresponding path program 14 times [2018-12-03 19:23:37,069 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:37,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:37,070 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:37,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:37,070 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:37,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:37,248 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:37,248 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:37,248 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:37,248 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:37,248 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:37,248 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:37,249 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 19:23:37,257 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:23:37,258 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:23:37,334 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-12-03 19:23:37,334 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:37,337 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:37,402 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:37,402 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:37,490 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:37,509 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:37,510 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 13 [2018-12-03 19:23:37,510 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:37,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 19:23:37,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 19:23:37,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2018-12-03 19:23:37,511 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 14 states. [2018-12-03 19:23:37,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:37,668 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2018-12-03 19:23:37,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 19:23:37,668 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2018-12-03 19:23:37,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:37,670 INFO L225 Difference]: With dead ends: 36 [2018-12-03 19:23:37,670 INFO L226 Difference]: Without dead ends: 34 [2018-12-03 19:23:37,671 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 43 SyntacticMatches, 16 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=189, Invalid=317, Unknown=0, NotChecked=0, Total=506 [2018-12-03 19:23:37,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-12-03 19:23:37,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2018-12-03 19:23:37,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-03 19:23:37,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-12-03 19:23:37,677 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 27 [2018-12-03 19:23:37,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:37,678 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-12-03 19:23:37,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 19:23:37,678 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-12-03 19:23:37,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-12-03 19:23:37,679 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:37,679 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1] [2018-12-03 19:23:37,679 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:37,679 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:37,679 INFO L82 PathProgramCache]: Analyzing trace with hash 1158582661, now seen corresponding path program 15 times [2018-12-03 19:23:37,679 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:37,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:37,680 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:37,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:37,680 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:37,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:37,950 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 72 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:37,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:37,950 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:37,951 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:37,951 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:37,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:37,951 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 19:23:37,961 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:23:37,961 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:23:37,981 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:23:37,981 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:37,984 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:38,283 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 72 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:38,284 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:38,463 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 72 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:38,482 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:38,482 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 28 [2018-12-03 19:23:38,482 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:38,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 19:23:38,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 19:23:38,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2018-12-03 19:23:38,484 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 29 states. [2018-12-03 19:23:38,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:38,773 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2018-12-03 19:23:38,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 19:23:38,773 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 29 [2018-12-03 19:23:38,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:38,773 INFO L225 Difference]: With dead ends: 52 [2018-12-03 19:23:38,774 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 19:23:38,775 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 31 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=361, Invalid=1045, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 19:23:38,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 19:23:38,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-12-03 19:23:38,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 19:23:38,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-12-03 19:23:38,780 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 29 [2018-12-03 19:23:38,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:38,781 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-12-03 19:23:38,781 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 19:23:38,781 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-12-03 19:23:38,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 19:23:38,782 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:38,782 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1] [2018-12-03 19:23:38,782 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:38,782 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:38,782 INFO L82 PathProgramCache]: Analyzing trace with hash 2054811054, now seen corresponding path program 16 times [2018-12-03 19:23:38,782 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:38,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:38,783 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:38,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:38,783 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:38,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:38,957 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:38,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:38,957 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:38,958 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:38,958 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:38,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:38,958 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 19:23:38,969 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:38,970 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:23:38,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:38,995 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:39,026 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:39,026 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:39,145 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:39,167 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:39,167 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 14 [2018-12-03 19:23:39,168 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:39,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 19:23:39,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 19:23:39,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=127, Unknown=0, NotChecked=0, Total=210 [2018-12-03 19:23:39,169 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 15 states. [2018-12-03 19:23:39,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:39,531 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-12-03 19:23:39,531 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 19:23:39,532 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 30 [2018-12-03 19:23:39,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:39,533 INFO L225 Difference]: With dead ends: 39 [2018-12-03 19:23:39,533 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 19:23:39,534 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 48 SyntacticMatches, 18 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=224, Invalid=376, Unknown=0, NotChecked=0, Total=600 [2018-12-03 19:23:39,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 19:23:39,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33. [2018-12-03 19:23:39,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-03 19:23:39,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-12-03 19:23:39,545 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2018-12-03 19:23:39,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:39,545 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-12-03 19:23:39,545 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 19:23:39,545 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-12-03 19:23:39,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 19:23:39,547 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:39,547 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1] [2018-12-03 19:23:39,547 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:39,547 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:39,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1011600054, now seen corresponding path program 17 times [2018-12-03 19:23:39,548 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:39,548 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:39,548 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:39,548 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:39,548 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:39,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:39,827 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 90 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:39,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:39,828 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:39,828 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:39,828 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:39,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:39,828 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 19:23:39,839 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:23:39,839 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:23:39,865 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-12-03 19:23:39,866 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:39,868 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:40,068 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 90 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:40,068 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:40,241 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 90 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:40,260 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:40,260 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 31 [2018-12-03 19:23:40,261 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:40,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 19:23:40,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 19:23:40,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2018-12-03 19:23:40,262 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 32 states. [2018-12-03 19:23:40,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:40,972 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-12-03 19:23:40,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-03 19:23:40,972 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 32 [2018-12-03 19:23:40,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:40,973 INFO L225 Difference]: With dead ends: 57 [2018-12-03 19:23:40,973 INFO L226 Difference]: Without dead ends: 34 [2018-12-03 19:23:40,974 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 34 SyntacticMatches, 19 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=436, Invalid=1286, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 19:23:40,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-12-03 19:23:40,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-12-03 19:23:40,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-12-03 19:23:40,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2018-12-03 19:23:40,982 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 32 [2018-12-03 19:23:40,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:40,982 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2018-12-03 19:23:40,982 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 19:23:40,983 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2018-12-03 19:23:40,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-12-03 19:23:40,983 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:40,983 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1] [2018-12-03 19:23:40,984 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:40,984 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:40,984 INFO L82 PathProgramCache]: Analyzing trace with hash 1011743873, now seen corresponding path program 18 times [2018-12-03 19:23:40,984 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:40,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:40,985 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:40,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:40,985 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:40,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:41,466 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:41,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:41,467 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:41,467 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:41,467 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:41,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:41,467 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 19:23:41,483 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:23:41,483 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:23:41,507 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:23:41,507 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:41,509 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:41,561 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:41,561 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:41,877 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:41,907 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:41,907 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 15 [2018-12-03 19:23:41,907 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:41,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 19:23:41,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 19:23:41,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=144, Unknown=0, NotChecked=0, Total=240 [2018-12-03 19:23:41,909 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 16 states. [2018-12-03 19:23:42,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:42,245 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2018-12-03 19:23:42,245 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 19:23:42,246 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2018-12-03 19:23:42,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:42,246 INFO L225 Difference]: With dead ends: 42 [2018-12-03 19:23:42,247 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 19:23:42,247 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 53 SyntacticMatches, 20 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=262, Invalid=440, Unknown=0, NotChecked=0, Total=702 [2018-12-03 19:23:42,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 19:23:42,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 36. [2018-12-03 19:23:42,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-12-03 19:23:42,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-12-03 19:23:42,254 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 33 [2018-12-03 19:23:42,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:42,255 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-12-03 19:23:42,255 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 19:23:42,255 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-12-03 19:23:42,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-12-03 19:23:42,256 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:42,256 INFO L402 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1] [2018-12-03 19:23:42,256 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:42,256 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:42,256 INFO L82 PathProgramCache]: Analyzing trace with hash 1623186269, now seen corresponding path program 19 times [2018-12-03 19:23:42,257 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:42,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:42,257 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:42,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:42,258 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:42,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:42,627 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 110 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:42,627 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:42,627 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:42,628 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:42,628 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:42,628 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:42,628 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 19:23:42,637 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:42,637 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:23:42,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:42,670 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:42,942 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 110 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:42,942 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:43,339 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 110 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:43,359 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:43,359 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 34 [2018-12-03 19:23:43,359 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:43,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 19:23:43,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 19:23:43,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=892, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 19:23:43,360 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 35 states. [2018-12-03 19:23:43,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:43,664 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2018-12-03 19:23:43,664 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 19:23:43,664 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 35 [2018-12-03 19:23:43,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:43,665 INFO L225 Difference]: With dead ends: 62 [2018-12-03 19:23:43,665 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 19:23:43,666 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 37 SyntacticMatches, 21 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 640 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=518, Invalid=1552, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 19:23:43,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 19:23:43,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-12-03 19:23:43,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 19:23:43,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-12-03 19:23:43,672 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 35 [2018-12-03 19:23:43,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:43,672 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2018-12-03 19:23:43,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 19:23:43,672 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2018-12-03 19:23:43,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-12-03 19:23:43,673 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:43,673 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1] [2018-12-03 19:23:43,673 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:43,674 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:43,674 INFO L82 PathProgramCache]: Analyzing trace with hash -803883834, now seen corresponding path program 20 times [2018-12-03 19:23:43,674 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:43,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:43,674 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:43,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:43,675 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:43,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:43,861 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:43,861 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:43,861 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:43,861 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:43,861 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:43,861 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:43,862 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 19:23:43,870 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:23:43,870 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:23:43,951 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-12-03 19:23:43,951 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:43,954 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:44,010 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:44,010 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:44,160 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:44,179 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:44,179 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 16 [2018-12-03 19:23:44,179 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:44,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 19:23:44,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 19:23:44,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=162, Unknown=0, NotChecked=0, Total=272 [2018-12-03 19:23:44,180 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 17 states. [2018-12-03 19:23:44,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:44,387 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2018-12-03 19:23:44,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 19:23:44,390 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 36 [2018-12-03 19:23:44,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:44,391 INFO L225 Difference]: With dead ends: 45 [2018-12-03 19:23:44,391 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 19:23:44,392 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 58 SyntacticMatches, 22 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=303, Invalid=509, Unknown=0, NotChecked=0, Total=812 [2018-12-03 19:23:44,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 19:23:44,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 39. [2018-12-03 19:23:44,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 19:23:44,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-12-03 19:23:44,400 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2018-12-03 19:23:44,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:44,402 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-12-03 19:23:44,402 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 19:23:44,402 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-12-03 19:23:44,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 19:23:44,402 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:44,403 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1] [2018-12-03 19:23:44,403 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:44,403 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:44,403 INFO L82 PathProgramCache]: Analyzing trace with hash 561682018, now seen corresponding path program 21 times [2018-12-03 19:23:44,403 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:44,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:44,407 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:44,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:44,407 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:44,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:45,005 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 132 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:45,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:45,006 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:45,006 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:45,006 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:45,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:45,006 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 19:23:45,015 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:23:45,015 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:23:45,042 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:23:45,042 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:45,044 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:45,312 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 132 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:45,313 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:45,512 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 132 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:45,533 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:45,533 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 37 [2018-12-03 19:23:45,533 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:45,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 19:23:45,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 19:23:45,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 19:23:45,534 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 38 states. [2018-12-03 19:23:45,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:45,969 INFO L93 Difference]: Finished difference Result 67 states and 69 transitions. [2018-12-03 19:23:45,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 19:23:45,969 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 38 [2018-12-03 19:23:45,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:45,970 INFO L225 Difference]: With dead ends: 67 [2018-12-03 19:23:45,970 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 19:23:45,971 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 40 SyntacticMatches, 23 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 770 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=607, Invalid=1843, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 19:23:45,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 19:23:45,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-12-03 19:23:45,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-12-03 19:23:45,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2018-12-03 19:23:45,978 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 38 [2018-12-03 19:23:45,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:45,978 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2018-12-03 19:23:45,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 19:23:45,979 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2018-12-03 19:23:45,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-12-03 19:23:45,979 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:45,979 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1] [2018-12-03 19:23:45,979 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:45,980 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:45,980 INFO L82 PathProgramCache]: Analyzing trace with hash 1490671705, now seen corresponding path program 22 times [2018-12-03 19:23:45,980 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:45,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:45,981 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:45,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:45,981 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:45,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:46,809 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:46,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:46,809 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:46,809 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:46,810 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:46,810 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:46,810 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 19:23:46,819 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:46,819 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:23:46,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:46,849 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:47,082 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:47,083 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:48,350 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:48,369 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:48,369 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 17 [2018-12-03 19:23:48,369 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:48,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 19:23:48,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 19:23:48,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=181, Unknown=0, NotChecked=0, Total=306 [2018-12-03 19:23:48,370 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 18 states. [2018-12-03 19:23:48,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:48,666 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2018-12-03 19:23:48,667 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 19:23:48,667 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 39 [2018-12-03 19:23:48,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:48,667 INFO L225 Difference]: With dead ends: 48 [2018-12-03 19:23:48,667 INFO L226 Difference]: Without dead ends: 46 [2018-12-03 19:23:48,668 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 63 SyntacticMatches, 24 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=347, Invalid=583, Unknown=0, NotChecked=0, Total=930 [2018-12-03 19:23:48,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-12-03 19:23:48,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2018-12-03 19:23:48,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-03 19:23:48,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-12-03 19:23:48,678 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 39 [2018-12-03 19:23:48,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:48,678 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-12-03 19:23:48,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 19:23:48,678 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-12-03 19:23:48,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-12-03 19:23:48,679 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:48,679 INFO L402 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1] [2018-12-03 19:23:48,679 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:48,680 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:48,680 INFO L82 PathProgramCache]: Analyzing trace with hash -1983635147, now seen corresponding path program 23 times [2018-12-03 19:23:48,680 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:48,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:48,681 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:48,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:48,681 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:48,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:49,635 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 156 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:49,636 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:49,636 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:49,636 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:49,636 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:49,636 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:49,636 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 19:23:49,644 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:23:49,645 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:23:49,680 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-12-03 19:23:49,681 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:49,682 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:50,242 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 156 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:50,243 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:50,555 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 156 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:50,574 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:50,574 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 40 [2018-12-03 19:23:50,574 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:50,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 19:23:50,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 19:23:50,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 19:23:50,576 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 41 states. [2018-12-03 19:23:51,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:51,118 INFO L93 Difference]: Finished difference Result 72 states and 74 transitions. [2018-12-03 19:23:51,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-03 19:23:51,118 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 41 [2018-12-03 19:23:51,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:51,119 INFO L225 Difference]: With dead ends: 72 [2018-12-03 19:23:51,119 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 19:23:51,121 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 43 SyntacticMatches, 25 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 912 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=703, Invalid=2159, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 19:23:51,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 19:23:51,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-12-03 19:23:51,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-12-03 19:23:51,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-12-03 19:23:51,138 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 41 [2018-12-03 19:23:51,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:51,138 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-12-03 19:23:51,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 19:23:51,138 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-12-03 19:23:51,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 19:23:51,139 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:51,139 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1] [2018-12-03 19:23:51,139 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:51,139 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:51,139 INFO L82 PathProgramCache]: Analyzing trace with hash 1073842142, now seen corresponding path program 24 times [2018-12-03 19:23:51,139 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:51,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:51,140 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:51,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:51,140 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:51,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:52,201 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:52,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:52,201 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:52,201 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:52,202 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:52,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:52,202 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 19:23:52,210 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:23:52,210 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:23:52,244 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:23:52,244 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:52,246 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:52,269 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:52,269 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:52,419 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:52,438 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:52,438 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 18 [2018-12-03 19:23:52,438 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:52,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 19:23:52,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 19:23:52,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=201, Unknown=0, NotChecked=0, Total=342 [2018-12-03 19:23:52,439 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 19 states. [2018-12-03 19:23:52,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:52,674 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2018-12-03 19:23:52,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 19:23:52,674 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2018-12-03 19:23:52,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:52,675 INFO L225 Difference]: With dead ends: 51 [2018-12-03 19:23:52,675 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 19:23:52,676 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 68 SyntacticMatches, 26 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=394, Invalid=662, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 19:23:52,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 19:23:52,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 45. [2018-12-03 19:23:52,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 19:23:52,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-12-03 19:23:52,685 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2018-12-03 19:23:52,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:52,685 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-12-03 19:23:52,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 19:23:52,685 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-12-03 19:23:52,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 19:23:52,686 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:52,686 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1] [2018-12-03 19:23:52,686 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:52,686 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:52,686 INFO L82 PathProgramCache]: Analyzing trace with hash 1170080634, now seen corresponding path program 25 times [2018-12-03 19:23:52,687 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:52,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:52,687 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:52,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:52,688 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:52,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:53,112 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 182 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:53,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:53,112 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:53,113 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:53,113 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:53,113 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:53,113 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 19:23:53,121 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:53,121 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:23:53,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:53,155 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:53,512 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 182 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:53,512 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:53,899 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 182 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:53,918 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:53,919 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 43 [2018-12-03 19:23:53,919 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:53,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 19:23:53,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 19:23:53,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 19:23:53,921 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 44 states. [2018-12-03 19:23:54,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:54,374 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2018-12-03 19:23:54,374 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-03 19:23:54,374 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 44 [2018-12-03 19:23:54,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:54,375 INFO L225 Difference]: With dead ends: 77 [2018-12-03 19:23:54,375 INFO L226 Difference]: Without dead ends: 46 [2018-12-03 19:23:54,378 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 46 SyntacticMatches, 27 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1066 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=806, Invalid=2500, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 19:23:54,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-12-03 19:23:54,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-12-03 19:23:54,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-12-03 19:23:54,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-12-03 19:23:54,384 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 44 [2018-12-03 19:23:54,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:54,384 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-12-03 19:23:54,384 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 19:23:54,384 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-12-03 19:23:54,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-12-03 19:23:54,384 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:54,385 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1] [2018-12-03 19:23:54,385 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:54,385 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:54,385 INFO L82 PathProgramCache]: Analyzing trace with hash -1190416335, now seen corresponding path program 26 times [2018-12-03 19:23:54,385 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:54,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:54,386 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:54,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:54,386 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:54,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:54,594 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:54,594 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:54,594 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:54,594 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:54,594 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:54,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:54,595 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:23:54,604 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:23:54,604 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:23:54,664 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-12-03 19:23:54,664 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:54,666 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:54,694 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:54,694 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:55,085 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:55,104 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:55,105 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 19 [2018-12-03 19:23:55,105 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:55,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 19:23:55,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 19:23:55,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=222, Unknown=0, NotChecked=0, Total=380 [2018-12-03 19:23:55,106 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 20 states. [2018-12-03 19:23:55,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:55,406 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2018-12-03 19:23:55,407 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 19:23:55,407 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2018-12-03 19:23:55,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:55,408 INFO L225 Difference]: With dead ends: 54 [2018-12-03 19:23:55,408 INFO L226 Difference]: Without dead ends: 52 [2018-12-03 19:23:55,409 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 73 SyntacticMatches, 28 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=444, Invalid=746, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 19:23:55,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-03 19:23:55,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 48. [2018-12-03 19:23:55,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-03 19:23:55,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-12-03 19:23:55,416 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 45 [2018-12-03 19:23:55,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:55,416 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-12-03 19:23:55,416 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 19:23:55,417 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-12-03 19:23:55,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-12-03 19:23:55,417 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:55,417 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1] [2018-12-03 19:23:55,417 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:55,417 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:55,417 INFO L82 PathProgramCache]: Analyzing trace with hash -1528863987, now seen corresponding path program 27 times [2018-12-03 19:23:55,417 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:55,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:55,418 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:55,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:55,418 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:55,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:55,833 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 210 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:55,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:55,833 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:55,833 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:55,834 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:55,834 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:55,834 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:23:55,843 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:23:55,843 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:23:55,878 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:23:55,879 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:55,881 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:56,265 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 210 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:56,265 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:56,527 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 210 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:56,547 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:56,547 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 46 [2018-12-03 19:23:56,548 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:56,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 19:23:56,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 19:23:56,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 19:23:56,549 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 47 states. [2018-12-03 19:23:57,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:57,020 INFO L93 Difference]: Finished difference Result 82 states and 84 transitions. [2018-12-03 19:23:57,020 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-03 19:23:57,020 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 47 [2018-12-03 19:23:57,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:57,021 INFO L225 Difference]: With dead ends: 82 [2018-12-03 19:23:57,021 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 19:23:57,023 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 49 SyntacticMatches, 29 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=916, Invalid=2866, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 19:23:57,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 19:23:57,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-12-03 19:23:57,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 19:23:57,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-12-03 19:23:57,029 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 47 [2018-12-03 19:23:57,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:57,029 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-12-03 19:23:57,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 19:23:57,030 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-12-03 19:23:57,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 19:23:57,030 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:57,030 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1] [2018-12-03 19:23:57,031 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:57,031 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:57,031 INFO L82 PathProgramCache]: Analyzing trace with hash -1594530058, now seen corresponding path program 28 times [2018-12-03 19:23:57,031 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:57,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:57,032 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:57,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:57,032 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:57,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:57,247 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:57,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:57,248 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:57,248 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:57,248 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:57,248 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:57,248 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:23:57,257 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:57,257 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:23:57,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:57,294 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:57,340 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:57,340 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:57,539 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:57,558 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:57,559 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 20 [2018-12-03 19:23:57,559 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:57,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 19:23:57,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 19:23:57,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=244, Unknown=0, NotChecked=0, Total=420 [2018-12-03 19:23:57,560 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 21 states. [2018-12-03 19:23:57,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:57,849 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2018-12-03 19:23:57,849 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 19:23:57,849 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 48 [2018-12-03 19:23:57,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:57,850 INFO L225 Difference]: With dead ends: 57 [2018-12-03 19:23:57,850 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 19:23:57,852 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 78 SyntacticMatches, 30 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 527 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=497, Invalid=835, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 19:23:57,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 19:23:57,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2018-12-03 19:23:57,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 19:23:57,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-12-03 19:23:57,859 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2018-12-03 19:23:57,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:57,859 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-12-03 19:23:57,859 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 19:23:57,859 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-12-03 19:23:57,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 19:23:57,860 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:57,860 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1] [2018-12-03 19:23:57,860 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:57,860 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:57,860 INFO L82 PathProgramCache]: Analyzing trace with hash 959872146, now seen corresponding path program 29 times [2018-12-03 19:23:57,860 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:57,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:57,861 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:23:57,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:57,861 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:57,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:23:58,371 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 240 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:58,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:58,372 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:23:58,372 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:23:58,372 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:23:58,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:23:58,372 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:23:58,381 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:23:58,381 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:23:58,432 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-12-03 19:23:58,432 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:23:58,434 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:23:58,872 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 240 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:58,872 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:23:59,190 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 240 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:23:59,210 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:23:59,210 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 49 [2018-12-03 19:23:59,210 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:23:59,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 19:23:59,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 19:23:59,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 19:23:59,212 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 50 states. [2018-12-03 19:23:59,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:23:59,753 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2018-12-03 19:23:59,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-12-03 19:23:59,753 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 50 [2018-12-03 19:23:59,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:23:59,754 INFO L225 Difference]: With dead ends: 87 [2018-12-03 19:23:59,754 INFO L226 Difference]: Without dead ends: 52 [2018-12-03 19:23:59,755 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 52 SyntacticMatches, 31 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1410 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1033, Invalid=3257, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 19:23:59,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-03 19:23:59,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-12-03 19:23:59,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-12-03 19:23:59,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2018-12-03 19:23:59,762 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 50 [2018-12-03 19:23:59,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:23:59,763 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2018-12-03 19:23:59,763 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 19:23:59,763 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2018-12-03 19:23:59,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-12-03 19:23:59,763 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:23:59,763 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1] [2018-12-03 19:23:59,763 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:23:59,764 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:23:59,764 INFO L82 PathProgramCache]: Analyzing trace with hash -1087929335, now seen corresponding path program 30 times [2018-12-03 19:23:59,764 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:23:59,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:59,765 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:23:59,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:23:59,765 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:23:59,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:00,236 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:00,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:00,237 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:00,237 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:00,237 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:00,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:00,237 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:00,246 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:24:00,246 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:24:00,284 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:24:00,285 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:24:00,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:00,342 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:00,342 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:00,634 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:00,653 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:00,654 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 21 [2018-12-03 19:24:00,654 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:00,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 19:24:00,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 19:24:00,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=267, Unknown=0, NotChecked=0, Total=462 [2018-12-03 19:24:00,655 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand 22 states. [2018-12-03 19:24:01,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:01,151 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2018-12-03 19:24:01,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 19:24:01,152 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2018-12-03 19:24:01,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:01,153 INFO L225 Difference]: With dead ends: 60 [2018-12-03 19:24:01,153 INFO L226 Difference]: Without dead ends: 58 [2018-12-03 19:24:01,154 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 83 SyntacticMatches, 32 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=553, Invalid=929, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 19:24:01,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-03 19:24:01,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 54. [2018-12-03 19:24:01,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-12-03 19:24:01,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-12-03 19:24:01,166 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 51 [2018-12-03 19:24:01,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:01,166 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-12-03 19:24:01,166 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 19:24:01,167 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-12-03 19:24:01,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-12-03 19:24:01,167 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:01,167 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1] [2018-12-03 19:24:01,168 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:01,168 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:01,168 INFO L82 PathProgramCache]: Analyzing trace with hash -1823104795, now seen corresponding path program 31 times [2018-12-03 19:24:01,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:01,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:01,169 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:24:01,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:01,169 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:01,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:02,230 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 272 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:02,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:02,230 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:02,230 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:02,231 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:02,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:02,231 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:02,241 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:24:02,241 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:24:02,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:02,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:02,873 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 272 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:02,873 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:03,212 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 272 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:03,230 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:03,231 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 52 [2018-12-03 19:24:03,231 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:03,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 19:24:03,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 19:24:03,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 19:24:03,233 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 53 states. [2018-12-03 19:24:04,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:04,149 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2018-12-03 19:24:04,149 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-12-03 19:24:04,149 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 53 [2018-12-03 19:24:04,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:04,150 INFO L225 Difference]: With dead ends: 92 [2018-12-03 19:24:04,150 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 19:24:04,152 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 55 SyntacticMatches, 33 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1600 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1157, Invalid=3673, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 19:24:04,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 19:24:04,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-12-03 19:24:04,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-03 19:24:04,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2018-12-03 19:24:04,160 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 53 [2018-12-03 19:24:04,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:04,161 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2018-12-03 19:24:04,161 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 19:24:04,161 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2018-12-03 19:24:04,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 19:24:04,161 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:04,161 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1] [2018-12-03 19:24:04,162 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:04,162 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:04,162 INFO L82 PathProgramCache]: Analyzing trace with hash 2133414414, now seen corresponding path program 32 times [2018-12-03 19:24:04,162 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:04,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:04,163 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:24:04,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:04,163 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:04,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:04,451 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:04,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:04,451 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:04,451 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:04,451 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:04,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:04,451 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:04,460 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:24:04,460 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:24:04,514 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-12-03 19:24:04,514 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:24:04,517 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:04,547 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:04,547 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:04,791 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:04,810 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:04,810 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 22 [2018-12-03 19:24:04,810 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:04,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 19:24:04,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 19:24:04,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=291, Unknown=0, NotChecked=0, Total=506 [2018-12-03 19:24:04,811 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 23 states. [2018-12-03 19:24:05,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:05,195 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-12-03 19:24:05,195 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 19:24:05,195 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 54 [2018-12-03 19:24:05,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:05,196 INFO L225 Difference]: With dead ends: 63 [2018-12-03 19:24:05,196 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 19:24:05,197 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 88 SyntacticMatches, 34 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 665 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=612, Invalid=1028, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 19:24:05,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 19:24:05,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 57. [2018-12-03 19:24:05,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-03 19:24:05,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-12-03 19:24:05,206 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2018-12-03 19:24:05,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:05,206 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-12-03 19:24:05,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 19:24:05,206 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-12-03 19:24:05,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-12-03 19:24:05,207 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:05,207 INFO L402 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1] [2018-12-03 19:24:05,207 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:05,207 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:05,208 INFO L82 PathProgramCache]: Analyzing trace with hash 1511784874, now seen corresponding path program 33 times [2018-12-03 19:24:05,208 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:05,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:05,209 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:24:05,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:05,209 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:05,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:05,784 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 306 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:05,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:05,784 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:05,784 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:05,784 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:05,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:05,784 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:05,793 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:24:05,793 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:24:05,830 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:24:05,831 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:24:05,833 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:06,382 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 306 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:06,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:06,767 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 306 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:06,786 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:06,787 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 55 [2018-12-03 19:24:06,787 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:06,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-12-03 19:24:06,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-12-03 19:24:06,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=2341, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 19:24:06,788 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 56 states. [2018-12-03 19:24:07,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:07,685 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2018-12-03 19:24:07,686 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-12-03 19:24:07,686 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 56 [2018-12-03 19:24:07,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:07,686 INFO L225 Difference]: With dead ends: 97 [2018-12-03 19:24:07,686 INFO L226 Difference]: Without dead ends: 58 [2018-12-03 19:24:07,687 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 58 SyntacticMatches, 35 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1802 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1288, Invalid=4114, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 19:24:07,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-03 19:24:07,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-12-03 19:24:07,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-12-03 19:24:07,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2018-12-03 19:24:07,696 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 56 [2018-12-03 19:24:07,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:07,697 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2018-12-03 19:24:07,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-12-03 19:24:07,697 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2018-12-03 19:24:07,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-12-03 19:24:07,697 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:07,698 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1] [2018-12-03 19:24:07,698 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:07,698 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:07,698 INFO L82 PathProgramCache]: Analyzing trace with hash -906931231, now seen corresponding path program 34 times [2018-12-03 19:24:07,698 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:07,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:07,699 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:24:07,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:07,699 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:07,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:07,980 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:07,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:07,980 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:07,981 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:07,981 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:07,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:07,981 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:08,001 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:24:08,002 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:24:08,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:08,045 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:08,073 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:08,073 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:08,554 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:08,574 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:08,574 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 23 [2018-12-03 19:24:08,574 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:08,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 19:24:08,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 19:24:08,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2018-12-03 19:24:08,575 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 24 states. [2018-12-03 19:24:08,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:08,917 INFO L93 Difference]: Finished difference Result 66 states and 67 transitions. [2018-12-03 19:24:08,917 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 19:24:08,917 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 57 [2018-12-03 19:24:08,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:08,917 INFO L225 Difference]: With dead ends: 66 [2018-12-03 19:24:08,918 INFO L226 Difference]: Without dead ends: 64 [2018-12-03 19:24:08,918 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 93 SyntacticMatches, 36 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 740 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=674, Invalid=1132, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 19:24:08,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-12-03 19:24:08,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 60. [2018-12-03 19:24:08,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-12-03 19:24:08,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-12-03 19:24:08,929 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 57 [2018-12-03 19:24:08,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:08,929 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-12-03 19:24:08,929 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 19:24:08,929 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-12-03 19:24:08,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-12-03 19:24:08,929 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:08,930 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1] [2018-12-03 19:24:08,930 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:08,930 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:08,930 INFO L82 PathProgramCache]: Analyzing trace with hash 317381309, now seen corresponding path program 35 times [2018-12-03 19:24:08,930 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:08,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:08,931 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:24:08,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:08,931 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:08,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:10,791 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 342 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:10,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:10,791 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:10,792 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:10,792 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:10,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:10,792 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:10,801 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:24:10,801 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:24:10,867 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-12-03 19:24:10,868 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:24:10,871 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:11,545 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 342 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:11,545 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:11,972 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 342 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:11,992 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:11,992 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 58 [2018-12-03 19:24:11,992 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:11,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 19:24:11,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 19:24:11,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 19:24:11,994 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 59 states. [2018-12-03 19:24:12,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:12,893 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2018-12-03 19:24:12,893 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-12-03 19:24:12,894 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 59 [2018-12-03 19:24:12,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:12,895 INFO L225 Difference]: With dead ends: 102 [2018-12-03 19:24:12,895 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 19:24:12,896 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 61 SyntacticMatches, 37 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2016 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1426, Invalid=4580, Unknown=0, NotChecked=0, Total=6006 [2018-12-03 19:24:12,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 19:24:12,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-12-03 19:24:12,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-12-03 19:24:12,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2018-12-03 19:24:12,907 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 59 [2018-12-03 19:24:12,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:12,908 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2018-12-03 19:24:12,908 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 19:24:12,908 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2018-12-03 19:24:12,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-12-03 19:24:12,908 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:12,908 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1] [2018-12-03 19:24:12,909 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:12,909 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:12,909 INFO L82 PathProgramCache]: Analyzing trace with hash 1012222246, now seen corresponding path program 36 times [2018-12-03 19:24:12,909 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:12,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:12,910 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:24:12,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:12,910 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:12,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:13,269 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:13,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:13,270 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:13,270 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:13,270 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:13,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:13,270 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:13,278 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:24:13,279 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:24:13,323 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:24:13,323 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:24:13,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:13,535 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:13,535 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:13,876 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:13,895 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:13,895 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 24 [2018-12-03 19:24:13,895 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:13,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-03 19:24:13,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-03 19:24:13,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=342, Unknown=0, NotChecked=0, Total=600 [2018-12-03 19:24:13,896 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 25 states. [2018-12-03 19:24:14,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:14,274 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-12-03 19:24:14,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 19:24:14,274 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 60 [2018-12-03 19:24:14,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:14,275 INFO L225 Difference]: With dead ends: 69 [2018-12-03 19:24:14,275 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 19:24:14,275 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 98 SyntacticMatches, 38 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 819 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=739, Invalid=1241, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 19:24:14,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 19:24:14,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 63. [2018-12-03 19:24:14,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 19:24:14,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-12-03 19:24:14,290 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 60 [2018-12-03 19:24:14,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:14,290 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-12-03 19:24:14,290 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-03 19:24:14,290 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-12-03 19:24:14,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 19:24:14,291 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:14,291 INFO L402 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1] [2018-12-03 19:24:14,291 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:14,291 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:14,291 INFO L82 PathProgramCache]: Analyzing trace with hash 2082902722, now seen corresponding path program 37 times [2018-12-03 19:24:14,291 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:14,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:14,292 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:24:14,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:14,292 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:14,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:14,996 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 380 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:14,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:14,997 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:14,997 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:14,997 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:14,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:14,997 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:15,007 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:24:15,007 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:24:15,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:15,063 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:16,841 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 380 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:16,841 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:17,301 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 380 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:17,320 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:17,321 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 61 [2018-12-03 19:24:17,321 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:17,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-12-03 19:24:17,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-12-03 19:24:17,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2881, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 19:24:17,322 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 62 states. [2018-12-03 19:24:18,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:18,273 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2018-12-03 19:24:18,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-12-03 19:24:18,273 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 62 [2018-12-03 19:24:18,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:18,274 INFO L225 Difference]: With dead ends: 107 [2018-12-03 19:24:18,274 INFO L226 Difference]: Without dead ends: 64 [2018-12-03 19:24:18,275 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 64 SyntacticMatches, 39 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2242 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1571, Invalid=5071, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 19:24:18,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-12-03 19:24:18,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2018-12-03 19:24:18,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-12-03 19:24:18,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2018-12-03 19:24:18,289 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 62 [2018-12-03 19:24:18,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:18,289 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2018-12-03 19:24:18,289 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-12-03 19:24:18,289 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2018-12-03 19:24:18,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-12-03 19:24:18,289 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:18,289 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1] [2018-12-03 19:24:18,289 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:18,290 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:18,290 INFO L82 PathProgramCache]: Analyzing trace with hash 346890169, now seen corresponding path program 38 times [2018-12-03 19:24:18,290 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:18,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:18,290 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:24:18,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:18,291 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:18,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:18,581 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 210 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:18,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:18,582 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:18,582 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:18,582 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:18,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:18,582 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:18,591 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:24:18,591 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:24:18,651 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-12-03 19:24:18,651 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:24:18,654 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:18,696 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 210 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:18,697 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:19,021 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 210 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:19,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:19,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 25 [2018-12-03 19:24:19,040 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:19,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 19:24:19,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 19:24:19,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=369, Unknown=0, NotChecked=0, Total=650 [2018-12-03 19:24:19,041 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand 26 states. [2018-12-03 19:24:19,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:19,417 INFO L93 Difference]: Finished difference Result 72 states and 73 transitions. [2018-12-03 19:24:19,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 19:24:19,417 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 63 [2018-12-03 19:24:19,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:19,418 INFO L225 Difference]: With dead ends: 72 [2018-12-03 19:24:19,418 INFO L226 Difference]: Without dead ends: 70 [2018-12-03 19:24:19,419 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 103 SyntacticMatches, 40 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 902 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=807, Invalid=1355, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 19:24:19,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-12-03 19:24:19,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2018-12-03 19:24:19,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-03 19:24:19,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-12-03 19:24:19,433 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 63 [2018-12-03 19:24:19,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:19,433 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-12-03 19:24:19,433 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 19:24:19,434 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-12-03 19:24:19,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-12-03 19:24:19,434 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:19,434 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1] [2018-12-03 19:24:19,434 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:19,434 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:19,435 INFO L82 PathProgramCache]: Analyzing trace with hash -1646063467, now seen corresponding path program 39 times [2018-12-03 19:24:19,435 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:19,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:19,436 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:24:19,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:19,436 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:19,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:20,111 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 420 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:20,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:20,111 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:20,111 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:20,111 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:20,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:20,111 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:20,121 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:24:20,121 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:24:20,168 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:24:20,169 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:24:20,172 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:21,009 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 420 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:21,010 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:21,620 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 420 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:21,638 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:21,639 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 64 [2018-12-03 19:24:21,639 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:21,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 19:24:21,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 19:24:21,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 19:24:21,640 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 65 states. [2018-12-03 19:24:23,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:23,065 INFO L93 Difference]: Finished difference Result 112 states and 114 transitions. [2018-12-03 19:24:23,065 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 19:24:23,065 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 65 [2018-12-03 19:24:23,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:23,066 INFO L225 Difference]: With dead ends: 112 [2018-12-03 19:24:23,066 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 19:24:23,067 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 67 SyntacticMatches, 41 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2480 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1723, Invalid=5587, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 19:24:23,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 19:24:23,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-12-03 19:24:23,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-12-03 19:24:23,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-12-03 19:24:23,082 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 65 [2018-12-03 19:24:23,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:23,082 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-12-03 19:24:23,082 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 19:24:23,082 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-12-03 19:24:23,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-12-03 19:24:23,083 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:23,083 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1] [2018-12-03 19:24:23,083 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:23,083 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:23,083 INFO L82 PathProgramCache]: Analyzing trace with hash 800148542, now seen corresponding path program 40 times [2018-12-03 19:24:23,084 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:23,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:23,084 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:24:23,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:23,085 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:23,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:23,564 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 231 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:23,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:23,565 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:23,565 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:23,565 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:23,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:23,565 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:23,574 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:24:23,574 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:24:23,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:23,623 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:23,704 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 231 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:23,705 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:24,107 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 231 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:24,126 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:24,126 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 26 [2018-12-03 19:24:24,126 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:24,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 19:24:24,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 19:24:24,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=397, Unknown=0, NotChecked=0, Total=702 [2018-12-03 19:24:24,127 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 27 states. [2018-12-03 19:24:24,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:24,526 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2018-12-03 19:24:24,526 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 19:24:24,526 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 66 [2018-12-03 19:24:24,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:24,527 INFO L225 Difference]: With dead ends: 75 [2018-12-03 19:24:24,527 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 19:24:24,528 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 108 SyntacticMatches, 42 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 989 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=878, Invalid=1474, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 19:24:24,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 19:24:24,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 69. [2018-12-03 19:24:24,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-03 19:24:24,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-12-03 19:24:24,545 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 66 [2018-12-03 19:24:24,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:24,545 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-12-03 19:24:24,545 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 19:24:24,545 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-12-03 19:24:24,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-12-03 19:24:24,546 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:24,546 INFO L402 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1] [2018-12-03 19:24:24,546 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:24,546 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:24,546 INFO L82 PathProgramCache]: Analyzing trace with hash 143536090, now seen corresponding path program 41 times [2018-12-03 19:24:24,546 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:24,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:24,547 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:24:24,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:24,547 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:24,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:26,017 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 462 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:26,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:26,017 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:26,017 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:26,017 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:26,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:26,017 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:26,025 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:24:26,026 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:24:26,091 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-12-03 19:24:26,091 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:24:26,094 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:26,877 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 462 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:26,877 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:27,471 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 462 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:27,492 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:27,492 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 67 [2018-12-03 19:24:27,492 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:27,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-12-03 19:24:27,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-12-03 19:24:27,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1079, Invalid=3477, Unknown=0, NotChecked=0, Total=4556 [2018-12-03 19:24:27,493 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 68 states. [2018-12-03 19:24:28,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:28,341 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2018-12-03 19:24:28,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-12-03 19:24:28,341 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 68 [2018-12-03 19:24:28,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:28,342 INFO L225 Difference]: With dead ends: 117 [2018-12-03 19:24:28,342 INFO L226 Difference]: Without dead ends: 70 [2018-12-03 19:24:28,343 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 70 SyntacticMatches, 43 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2730 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1882, Invalid=6128, Unknown=0, NotChecked=0, Total=8010 [2018-12-03 19:24:28,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-12-03 19:24:28,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-12-03 19:24:28,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-12-03 19:24:28,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2018-12-03 19:24:28,359 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 68 [2018-12-03 19:24:28,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:28,359 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2018-12-03 19:24:28,359 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-12-03 19:24:28,359 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2018-12-03 19:24:28,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-12-03 19:24:28,360 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:28,360 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1] [2018-12-03 19:24:28,360 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:28,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:28,360 INFO L82 PathProgramCache]: Analyzing trace with hash -1759582319, now seen corresponding path program 42 times [2018-12-03 19:24:28,360 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:28,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:28,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:24:28,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:28,361 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:28,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:28,930 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 253 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:28,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:28,930 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:28,930 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:28,930 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:28,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:28,930 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:28,940 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:24:28,940 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:24:28,994 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:24:28,994 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:24:28,998 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:29,037 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 253 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:29,037 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:29,432 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 253 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:29,452 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:29,452 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 27 [2018-12-03 19:24:29,452 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:29,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-12-03 19:24:29,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-12-03 19:24:29,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=330, Invalid=426, Unknown=0, NotChecked=0, Total=756 [2018-12-03 19:24:29,453 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand 28 states. [2018-12-03 19:24:29,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:29,871 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2018-12-03 19:24:29,872 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-12-03 19:24:29,872 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 69 [2018-12-03 19:24:29,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:29,873 INFO L225 Difference]: With dead ends: 78 [2018-12-03 19:24:29,873 INFO L226 Difference]: Without dead ends: 76 [2018-12-03 19:24:29,873 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 113 SyntacticMatches, 44 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1080 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=952, Invalid=1598, Unknown=0, NotChecked=0, Total=2550 [2018-12-03 19:24:29,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-12-03 19:24:29,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 72. [2018-12-03 19:24:29,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-12-03 19:24:29,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-12-03 19:24:29,890 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 69 [2018-12-03 19:24:29,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:29,890 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-12-03 19:24:29,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-12-03 19:24:29,890 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-12-03 19:24:29,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-12-03 19:24:29,890 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:29,891 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1] [2018-12-03 19:24:29,891 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:29,891 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:29,891 INFO L82 PathProgramCache]: Analyzing trace with hash 1258439277, now seen corresponding path program 43 times [2018-12-03 19:24:29,891 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:29,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:29,892 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:24:29,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:29,892 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:29,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:30,665 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 506 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:30,665 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:30,665 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:30,665 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:30,666 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:30,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:30,666 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:30,674 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:24:30,675 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:24:30,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:30,726 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:31,736 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 506 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:31,737 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:32,361 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 506 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:32,379 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:32,380 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 70 [2018-12-03 19:24:32,380 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:32,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 19:24:32,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 19:24:32,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 19:24:32,381 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 71 states. [2018-12-03 19:24:33,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:33,189 INFO L93 Difference]: Finished difference Result 122 states and 124 transitions. [2018-12-03 19:24:33,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-03 19:24:33,189 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 71 [2018-12-03 19:24:33,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:33,190 INFO L225 Difference]: With dead ends: 122 [2018-12-03 19:24:33,190 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 19:24:33,191 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 73 SyntacticMatches, 45 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2992 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2048, Invalid=6694, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 19:24:33,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 19:24:33,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2018-12-03 19:24:33,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 19:24:33,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2018-12-03 19:24:33,204 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 71 [2018-12-03 19:24:33,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:33,204 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2018-12-03 19:24:33,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 19:24:33,204 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2018-12-03 19:24:33,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 19:24:33,204 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:33,205 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1] [2018-12-03 19:24:33,205 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:33,205 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:33,205 INFO L82 PathProgramCache]: Analyzing trace with hash -973776042, now seen corresponding path program 44 times [2018-12-03 19:24:33,205 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:33,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:33,206 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:24:33,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:33,206 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:33,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:33,782 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 276 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:33,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:33,783 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:33,783 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:33,783 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:33,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:33,783 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:33,793 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:24:33,793 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:24:33,870 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-12-03 19:24:33,871 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:24:33,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:33,946 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 276 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:33,946 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:34,390 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 276 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:34,410 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:34,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 28 [2018-12-03 19:24:34,410 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:34,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 19:24:34,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 19:24:34,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=456, Unknown=0, NotChecked=0, Total=812 [2018-12-03 19:24:34,411 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand 29 states. [2018-12-03 19:24:34,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:34,868 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2018-12-03 19:24:34,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 19:24:34,869 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2018-12-03 19:24:34,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:34,869 INFO L225 Difference]: With dead ends: 81 [2018-12-03 19:24:34,869 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 19:24:34,870 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 118 SyntacticMatches, 46 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1175 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1029, Invalid=1727, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 19:24:34,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 19:24:34,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 75. [2018-12-03 19:24:34,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-03 19:24:34,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-12-03 19:24:34,886 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 72 [2018-12-03 19:24:34,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:34,886 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-12-03 19:24:34,886 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 19:24:34,886 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-12-03 19:24:34,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-12-03 19:24:34,887 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:34,887 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1] [2018-12-03 19:24:34,887 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:34,887 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:34,887 INFO L82 PathProgramCache]: Analyzing trace with hash 504027378, now seen corresponding path program 45 times [2018-12-03 19:24:34,887 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:34,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:34,888 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:24:34,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:34,888 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:34,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:35,899 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 552 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:35,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:35,900 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:35,900 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:35,900 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:35,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:35,900 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:35,911 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:24:35,911 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:24:35,966 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:24:35,966 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:24:35,971 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:37,845 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 552 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:37,846 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:38,872 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 552 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:38,891 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:38,891 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 73 [2018-12-03 19:24:38,892 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:38,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-03 19:24:38,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-03 19:24:38,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 19:24:38,893 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 74 states. [2018-12-03 19:24:40,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:40,240 INFO L93 Difference]: Finished difference Result 127 states and 129 transitions. [2018-12-03 19:24:40,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-03 19:24:40,240 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 74 [2018-12-03 19:24:40,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:40,241 INFO L225 Difference]: With dead ends: 127 [2018-12-03 19:24:40,241 INFO L226 Difference]: Without dead ends: 76 [2018-12-03 19:24:40,242 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 76 SyntacticMatches, 47 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=2221, Invalid=7285, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 19:24:40,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-12-03 19:24:40,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2018-12-03 19:24:40,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-12-03 19:24:40,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2018-12-03 19:24:40,255 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 74 [2018-12-03 19:24:40,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:40,256 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2018-12-03 19:24:40,256 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-03 19:24:40,256 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2018-12-03 19:24:40,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-12-03 19:24:40,256 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:40,256 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1] [2018-12-03 19:24:40,256 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:40,257 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:40,257 INFO L82 PathProgramCache]: Analyzing trace with hash -443896983, now seen corresponding path program 46 times [2018-12-03 19:24:40,257 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:40,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:40,257 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:24:40,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:40,257 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:40,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:40,712 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 300 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:40,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:40,712 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:40,712 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:40,712 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:40,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:40,712 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:40,721 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:24:40,721 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:24:40,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:40,778 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:40,823 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 300 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:40,823 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:41,420 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 300 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:41,439 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:41,439 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 29 [2018-12-03 19:24:41,439 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:41,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-12-03 19:24:41,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-12-03 19:24:41,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=487, Unknown=0, NotChecked=0, Total=870 [2018-12-03 19:24:41,440 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand 30 states. [2018-12-03 19:24:41,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:41,938 INFO L93 Difference]: Finished difference Result 84 states and 85 transitions. [2018-12-03 19:24:41,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 19:24:41,938 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 75 [2018-12-03 19:24:41,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:41,940 INFO L225 Difference]: With dead ends: 84 [2018-12-03 19:24:41,940 INFO L226 Difference]: Without dead ends: 82 [2018-12-03 19:24:41,940 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 123 SyntacticMatches, 48 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1274 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1109, Invalid=1861, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 19:24:41,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-12-03 19:24:41,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 78. [2018-12-03 19:24:41,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-12-03 19:24:41,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-12-03 19:24:41,960 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 75 [2018-12-03 19:24:41,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:41,960 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-12-03 19:24:41,960 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-12-03 19:24:41,960 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-12-03 19:24:41,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-12-03 19:24:41,961 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:41,961 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1] [2018-12-03 19:24:41,961 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:41,961 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:41,961 INFO L82 PathProgramCache]: Analyzing trace with hash -1383305147, now seen corresponding path program 47 times [2018-12-03 19:24:41,961 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:41,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:41,962 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:24:41,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:41,963 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:41,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:42,915 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 600 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:42,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:42,915 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:42,916 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:42,916 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:42,916 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:42,916 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:42,925 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:24:42,925 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:24:43,001 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-12-03 19:24:43,002 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:24:43,005 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:44,026 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 600 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:44,026 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:44,754 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 600 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:44,773 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:44,773 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 76 [2018-12-03 19:24:44,773 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:44,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 19:24:44,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 19:24:44,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 19:24:44,774 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 77 states. [2018-12-03 19:24:46,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:46,211 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2018-12-03 19:24:46,211 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-12-03 19:24:46,211 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 77 [2018-12-03 19:24:46,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:46,211 INFO L225 Difference]: With dead ends: 132 [2018-12-03 19:24:46,212 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 19:24:46,213 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 79 SyntacticMatches, 49 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3552 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2401, Invalid=7901, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 19:24:46,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 19:24:46,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-12-03 19:24:46,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-12-03 19:24:46,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-12-03 19:24:46,228 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 77 [2018-12-03 19:24:46,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:46,228 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-12-03 19:24:46,228 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 19:24:46,228 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-12-03 19:24:46,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-12-03 19:24:46,229 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:46,229 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1] [2018-12-03 19:24:46,229 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:46,229 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:46,229 INFO L82 PathProgramCache]: Analyzing trace with hash -1587972498, now seen corresponding path program 48 times [2018-12-03 19:24:46,229 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:46,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:46,230 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:24:46,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:46,230 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:46,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:46,750 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:46,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:46,750 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:46,750 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:46,750 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:46,751 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:46,751 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:46,759 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:24:46,760 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:24:46,821 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:24:46,821 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:24:46,825 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:46,866 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:46,866 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:47,482 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:47,501 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:47,501 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 30 [2018-12-03 19:24:47,501 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:47,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-12-03 19:24:47,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-12-03 19:24:47,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=411, Invalid=519, Unknown=0, NotChecked=0, Total=930 [2018-12-03 19:24:47,502 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 31 states. [2018-12-03 19:24:48,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:48,252 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2018-12-03 19:24:48,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 19:24:48,252 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 78 [2018-12-03 19:24:48,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:48,253 INFO L225 Difference]: With dead ends: 87 [2018-12-03 19:24:48,253 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 19:24:48,254 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 128 SyntacticMatches, 50 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1377 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1192, Invalid=2000, Unknown=0, NotChecked=0, Total=3192 [2018-12-03 19:24:48,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 19:24:48,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 81. [2018-12-03 19:24:48,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-03 19:24:48,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2018-12-03 19:24:48,273 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 78 [2018-12-03 19:24:48,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:48,274 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2018-12-03 19:24:48,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-12-03 19:24:48,274 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2018-12-03 19:24:48,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-12-03 19:24:48,274 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:48,275 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1] [2018-12-03 19:24:48,275 INFO L423 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:48,275 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:48,275 INFO L82 PathProgramCache]: Analyzing trace with hash -1328247286, now seen corresponding path program 49 times [2018-12-03 19:24:48,275 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:48,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:48,276 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:24:48,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:48,276 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:48,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:49,994 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 650 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:49,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:49,994 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:49,995 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:49,995 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:49,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:49,995 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:50,003 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:24:50,003 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:24:50,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:50,063 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:51,194 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 650 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:51,194 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:52,039 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 650 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:52,058 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:52,059 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 79 [2018-12-03 19:24:52,059 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:52,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-03 19:24:52,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-03 19:24:52,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 19:24:52,060 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand 80 states. [2018-12-03 19:24:53,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:53,572 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2018-12-03 19:24:53,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 19:24:53,573 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 80 [2018-12-03 19:24:53,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:53,573 INFO L225 Difference]: With dead ends: 137 [2018-12-03 19:24:53,574 INFO L226 Difference]: Without dead ends: 82 [2018-12-03 19:24:53,575 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 82 SyntacticMatches, 51 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3850 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2588, Invalid=8542, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 19:24:53,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-12-03 19:24:53,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2018-12-03 19:24:53,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-12-03 19:24:53,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-12-03 19:24:53,595 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 80 [2018-12-03 19:24:53,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:53,595 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-12-03 19:24:53,595 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-03 19:24:53,595 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-12-03 19:24:53,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-12-03 19:24:53,596 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:53,596 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1] [2018-12-03 19:24:53,596 INFO L423 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:53,596 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:53,597 INFO L82 PathProgramCache]: Analyzing trace with hash 280259393, now seen corresponding path program 50 times [2018-12-03 19:24:53,597 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:53,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:53,597 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:24:53,598 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:53,598 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:53,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:54,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:54,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:54,081 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:54,081 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:54,081 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:54,081 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:54,081 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:54,095 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:24:54,096 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:24:54,227 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2018-12-03 19:24:54,227 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:24:54,230 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:54,274 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:54,274 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:54,788 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:54,808 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:54,808 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 31 [2018-12-03 19:24:54,809 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:54,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 19:24:54,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 19:24:54,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=440, Invalid=552, Unknown=0, NotChecked=0, Total=992 [2018-12-03 19:24:54,810 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 32 states. [2018-12-03 19:24:55,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:24:55,931 INFO L93 Difference]: Finished difference Result 90 states and 91 transitions. [2018-12-03 19:24:55,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 19:24:55,931 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 81 [2018-12-03 19:24:55,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:24:55,932 INFO L225 Difference]: With dead ends: 90 [2018-12-03 19:24:55,932 INFO L226 Difference]: Without dead ends: 88 [2018-12-03 19:24:55,933 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 133 SyntacticMatches, 52 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1484 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1278, Invalid=2144, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 19:24:55,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-12-03 19:24:55,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2018-12-03 19:24:55,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-12-03 19:24:55,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2018-12-03 19:24:55,959 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 81 [2018-12-03 19:24:55,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:24:55,960 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2018-12-03 19:24:55,960 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 19:24:55,960 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2018-12-03 19:24:55,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-12-03 19:24:55,961 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:24:55,961 INFO L402 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1] [2018-12-03 19:24:55,961 INFO L423 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:24:55,961 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:24:55,961 INFO L82 PathProgramCache]: Analyzing trace with hash -1253729763, now seen corresponding path program 51 times [2018-12-03 19:24:55,962 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:24:55,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:55,962 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:24:55,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:24:55,963 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:24:55,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:24:57,525 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 702 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:57,525 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:57,525 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:24:57,525 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:24:57,525 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:24:57,526 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:24:57,526 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:24:57,536 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:24:57,536 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:24:57,600 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:24:57,600 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:24:57,604 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:24:58,859 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 702 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:58,859 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:24:59,694 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 702 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:24:59,715 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:24:59,715 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 82 [2018-12-03 19:24:59,715 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:24:59,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 19:24:59,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 19:24:59,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1594, Invalid=5212, Unknown=0, NotChecked=0, Total=6806 [2018-12-03 19:24:59,717 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand 83 states. [2018-12-03 19:25:01,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:25:01,332 INFO L93 Difference]: Finished difference Result 142 states and 144 transitions. [2018-12-03 19:25:01,332 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-12-03 19:25:01,333 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 83 [2018-12-03 19:25:01,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:25:01,333 INFO L225 Difference]: With dead ends: 142 [2018-12-03 19:25:01,333 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 19:25:01,334 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 85 SyntacticMatches, 53 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4160 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2782, Invalid=9208, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 19:25:01,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 19:25:01,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2018-12-03 19:25:01,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-12-03 19:25:01,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2018-12-03 19:25:01,351 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 83 [2018-12-03 19:25:01,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:25:01,351 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2018-12-03 19:25:01,351 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 19:25:01,351 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2018-12-03 19:25:01,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-12-03 19:25:01,352 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:25:01,352 INFO L402 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1] [2018-12-03 19:25:01,352 INFO L423 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:25:01,352 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:25:01,352 INFO L82 PathProgramCache]: Analyzing trace with hash -1181377146, now seen corresponding path program 52 times [2018-12-03 19:25:01,352 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:25:01,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:01,353 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:25:01,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:01,353 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:25:01,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:02,052 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 378 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:02,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:02,052 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:25:02,053 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:25:02,053 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:25:02,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:02,053 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:25:02,063 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:25:02,063 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:25:02,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:02,129 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:25:02,263 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 378 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:02,264 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:25:02,895 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 378 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:02,915 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:25:02,915 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 32 [2018-12-03 19:25:02,916 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:25:02,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-12-03 19:25:02,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-12-03 19:25:02,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=586, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 19:25:02,916 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand 33 states. [2018-12-03 19:25:03,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:25:03,484 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2018-12-03 19:25:03,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 19:25:03,484 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 84 [2018-12-03 19:25:03,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:25:03,485 INFO L225 Difference]: With dead ends: 93 [2018-12-03 19:25:03,485 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 19:25:03,486 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 138 SyntacticMatches, 54 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1595 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1367, Invalid=2293, Unknown=0, NotChecked=0, Total=3660 [2018-12-03 19:25:03,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 19:25:03,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 87. [2018-12-03 19:25:03,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 19:25:03,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-12-03 19:25:03,505 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 84 [2018-12-03 19:25:03,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:25:03,506 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-12-03 19:25:03,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-12-03 19:25:03,506 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-12-03 19:25:03,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 19:25:03,506 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:25:03,506 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1] [2018-12-03 19:25:03,506 INFO L423 AbstractCegarLoop]: === Iteration 55 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:25:03,506 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:25:03,507 INFO L82 PathProgramCache]: Analyzing trace with hash -1432137950, now seen corresponding path program 53 times [2018-12-03 19:25:03,507 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:25:03,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:03,507 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:25:03,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:03,507 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:25:03,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:04,737 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 756 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:04,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:04,738 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:25:04,738 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:25:04,738 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:25:04,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:04,738 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:25:04,748 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:25:04,748 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:25:04,844 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-12-03 19:25:04,845 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:25:04,848 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:25:06,069 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 756 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:06,069 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:25:07,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 756 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:07,265 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:25:07,265 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 85 [2018-12-03 19:25:07,265 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:25:07,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-03 19:25:07,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-03 19:25:07,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 19:25:07,267 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 86 states. [2018-12-03 19:25:09,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:25:09,006 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-12-03 19:25:09,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-12-03 19:25:09,006 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 86 [2018-12-03 19:25:09,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:25:09,007 INFO L225 Difference]: With dead ends: 147 [2018-12-03 19:25:09,007 INFO L226 Difference]: Without dead ends: 88 [2018-12-03 19:25:09,009 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 88 SyntacticMatches, 55 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4482 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2983, Invalid=9899, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 19:25:09,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-12-03 19:25:09,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-12-03 19:25:09,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-12-03 19:25:09,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2018-12-03 19:25:09,031 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 86 [2018-12-03 19:25:09,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:25:09,031 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2018-12-03 19:25:09,031 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-03 19:25:09,032 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2018-12-03 19:25:09,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-12-03 19:25:09,032 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:25:09,032 INFO L402 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1] [2018-12-03 19:25:09,032 INFO L423 AbstractCegarLoop]: === Iteration 56 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:25:09,032 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:25:09,032 INFO L82 PathProgramCache]: Analyzing trace with hash -2048907495, now seen corresponding path program 54 times [2018-12-03 19:25:09,033 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:25:09,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:09,033 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:25:09,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:09,033 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:25:09,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:09,777 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 406 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:09,777 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:09,777 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:25:09,777 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:25:09,777 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:25:09,777 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:09,777 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:25:09,787 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:25:09,787 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:25:09,858 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:25:09,858 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:25:09,862 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:25:09,909 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 406 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:09,909 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:25:10,687 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 406 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:10,706 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:25:10,706 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 33 [2018-12-03 19:25:10,706 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:25:10,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-12-03 19:25:10,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-12-03 19:25:10,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=621, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 19:25:10,707 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand 34 states. [2018-12-03 19:25:11,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:25:11,292 INFO L93 Difference]: Finished difference Result 96 states and 97 transitions. [2018-12-03 19:25:11,292 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-12-03 19:25:11,292 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 87 [2018-12-03 19:25:11,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:25:11,293 INFO L225 Difference]: With dead ends: 96 [2018-12-03 19:25:11,294 INFO L226 Difference]: Without dead ends: 94 [2018-12-03 19:25:11,294 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 143 SyntacticMatches, 56 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1710 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1459, Invalid=2447, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 19:25:11,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-03 19:25:11,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 90. [2018-12-03 19:25:11,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-12-03 19:25:11,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2018-12-03 19:25:11,315 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 87 [2018-12-03 19:25:11,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:25:11,316 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2018-12-03 19:25:11,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-12-03 19:25:11,316 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2018-12-03 19:25:11,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-12-03 19:25:11,316 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:25:11,317 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1] [2018-12-03 19:25:11,317 INFO L423 AbstractCegarLoop]: === Iteration 57 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:25:11,317 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:25:11,317 INFO L82 PathProgramCache]: Analyzing trace with hash -1905147915, now seen corresponding path program 55 times [2018-12-03 19:25:11,317 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:25:11,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:11,318 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:25:11,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:11,318 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:25:11,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:12,877 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 812 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:12,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:12,877 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:25:12,877 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:25:12,877 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:25:12,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:12,877 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:25:12,887 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:25:12,887 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:25:12,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:12,954 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:25:14,257 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 812 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:14,257 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:25:15,220 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 812 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:15,238 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:25:15,238 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 88 [2018-12-03 19:25:15,238 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:25:15,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 19:25:15,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 19:25:15,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 19:25:15,240 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand 89 states. [2018-12-03 19:25:17,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:25:17,240 INFO L93 Difference]: Finished difference Result 152 states and 154 transitions. [2018-12-03 19:25:17,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-12-03 19:25:17,240 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 89 [2018-12-03 19:25:17,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:25:17,241 INFO L225 Difference]: With dead ends: 152 [2018-12-03 19:25:17,241 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 19:25:17,242 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 91 SyntacticMatches, 57 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4816 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=3191, Invalid=10615, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 19:25:17,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 19:25:17,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-12-03 19:25:17,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-12-03 19:25:17,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2018-12-03 19:25:17,270 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 89 [2018-12-03 19:25:17,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:25:17,270 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2018-12-03 19:25:17,270 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 19:25:17,270 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2018-12-03 19:25:17,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-12-03 19:25:17,271 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:25:17,271 INFO L402 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1] [2018-12-03 19:25:17,272 INFO L423 AbstractCegarLoop]: === Iteration 58 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:25:17,272 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:25:17,272 INFO L82 PathProgramCache]: Analyzing trace with hash 2078396574, now seen corresponding path program 56 times [2018-12-03 19:25:17,272 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:25:17,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:17,273 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:25:17,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:17,273 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:25:17,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:18,215 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:18,215 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:18,215 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:25:18,215 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:25:18,216 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:25:18,216 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:18,216 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:25:18,225 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:25:18,225 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:25:18,321 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-12-03 19:25:18,321 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:25:18,324 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:25:18,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:18,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:25:19,116 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:19,135 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:25:19,135 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 34 [2018-12-03 19:25:19,135 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:25:19,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 19:25:19,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 19:25:19,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=533, Invalid=657, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 19:25:19,136 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand 35 states. [2018-12-03 19:25:19,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:25:19,756 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-12-03 19:25:19,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 19:25:19,756 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 90 [2018-12-03 19:25:19,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:25:19,757 INFO L225 Difference]: With dead ends: 99 [2018-12-03 19:25:19,757 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 19:25:19,758 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 148 SyntacticMatches, 58 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1829 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1554, Invalid=2606, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 19:25:19,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 19:25:19,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 93. [2018-12-03 19:25:19,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-03 19:25:19,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2018-12-03 19:25:19,782 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 90 [2018-12-03 19:25:19,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:25:19,782 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2018-12-03 19:25:19,782 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 19:25:19,782 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2018-12-03 19:25:19,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-12-03 19:25:19,783 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:25:19,783 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1] [2018-12-03 19:25:19,783 INFO L423 AbstractCegarLoop]: === Iteration 59 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:25:19,783 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:25:19,783 INFO L82 PathProgramCache]: Analyzing trace with hash 179248186, now seen corresponding path program 57 times [2018-12-03 19:25:19,784 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:25:19,784 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:19,784 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:25:19,784 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:19,784 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:25:19,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:20,980 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 870 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:20,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:20,980 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:25:20,980 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:25:20,980 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:25:20,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:20,981 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:25:20,988 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:25:20,988 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:25:21,060 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:25:21,060 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:25:21,065 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:25:22,752 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 870 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:22,753 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:25:23,804 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 870 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:23,823 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:25:23,823 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 91 [2018-12-03 19:25:23,823 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:25:23,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-03 19:25:23,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-03 19:25:23,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 19:25:23,825 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand 92 states. [2018-12-03 19:25:25,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:25:25,870 INFO L93 Difference]: Finished difference Result 157 states and 159 transitions. [2018-12-03 19:25:25,870 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-03 19:25:25,871 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 92 [2018-12-03 19:25:25,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:25:25,871 INFO L225 Difference]: With dead ends: 157 [2018-12-03 19:25:25,871 INFO L226 Difference]: Without dead ends: 94 [2018-12-03 19:25:25,872 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 94 SyntacticMatches, 59 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5162 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3406, Invalid=11356, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 19:25:25,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-03 19:25:25,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2018-12-03 19:25:25,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-12-03 19:25:25,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-12-03 19:25:25,892 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 92 [2018-12-03 19:25:25,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:25:25,892 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-12-03 19:25:25,892 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-03 19:25:25,892 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-12-03 19:25:25,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-12-03 19:25:25,893 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:25:25,893 INFO L402 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1] [2018-12-03 19:25:25,893 INFO L423 AbstractCegarLoop]: === Iteration 60 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:25:25,893 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:25:25,893 INFO L82 PathProgramCache]: Analyzing trace with hash -288235791, now seen corresponding path program 58 times [2018-12-03 19:25:25,893 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:25:25,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:25,894 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:25:25,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:25,894 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:25:25,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:26,442 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 465 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:26,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:26,442 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:25:26,442 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:25:26,442 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:25:26,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:26,442 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:25:26,452 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:25:26,452 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:25:26,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:26,525 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:25:26,569 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 465 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:26,569 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:25:27,463 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 465 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:27,482 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:25:27,482 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 35 [2018-12-03 19:25:27,482 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:25:27,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-12-03 19:25:27,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-12-03 19:25:27,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=566, Invalid=694, Unknown=0, NotChecked=0, Total=1260 [2018-12-03 19:25:27,483 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 36 states. [2018-12-03 19:25:28,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:25:28,143 INFO L93 Difference]: Finished difference Result 102 states and 103 transitions. [2018-12-03 19:25:28,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 19:25:28,144 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 93 [2018-12-03 19:25:28,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:25:28,145 INFO L225 Difference]: With dead ends: 102 [2018-12-03 19:25:28,145 INFO L226 Difference]: Without dead ends: 100 [2018-12-03 19:25:28,145 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 153 SyntacticMatches, 60 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1952 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1652, Invalid=2770, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 19:25:28,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-12-03 19:25:28,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 96. [2018-12-03 19:25:28,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-12-03 19:25:28,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2018-12-03 19:25:28,168 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 93 [2018-12-03 19:25:28,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:25:28,168 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2018-12-03 19:25:28,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-12-03 19:25:28,168 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2018-12-03 19:25:28,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-12-03 19:25:28,168 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:25:28,168 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1] [2018-12-03 19:25:28,169 INFO L423 AbstractCegarLoop]: === Iteration 61 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:25:28,169 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:25:28,169 INFO L82 PathProgramCache]: Analyzing trace with hash -2116754995, now seen corresponding path program 59 times [2018-12-03 19:25:28,169 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:25:28,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:28,170 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:25:28,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:28,170 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:25:28,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:29,447 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 930 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:29,447 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:29,447 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:25:29,447 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:25:29,447 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:25:29,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:29,448 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:25:29,457 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:25:29,457 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:25:29,567 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2018-12-03 19:25:29,567 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:25:29,571 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:25:31,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 930 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:31,081 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:25:32,298 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 930 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:32,318 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:25:32,318 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 94 [2018-12-03 19:25:32,318 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:25:32,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 19:25:32,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 19:25:32,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 19:25:32,320 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand 95 states. [2018-12-03 19:25:33,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:25:33,626 INFO L93 Difference]: Finished difference Result 162 states and 164 transitions. [2018-12-03 19:25:33,626 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-12-03 19:25:33,626 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 95 [2018-12-03 19:25:33,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:25:33,627 INFO L225 Difference]: With dead ends: 162 [2018-12-03 19:25:33,627 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 19:25:33,628 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 97 SyntacticMatches, 61 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5520 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=3628, Invalid=12122, Unknown=0, NotChecked=0, Total=15750 [2018-12-03 19:25:33,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 19:25:33,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-12-03 19:25:33,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-12-03 19:25:33,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-12-03 19:25:33,649 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 95 [2018-12-03 19:25:33,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:25:33,649 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-12-03 19:25:33,650 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 19:25:33,650 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-12-03 19:25:33,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-12-03 19:25:33,650 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:25:33,650 INFO L402 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1] [2018-12-03 19:25:33,650 INFO L423 AbstractCegarLoop]: === Iteration 62 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:25:33,650 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:25:33,651 INFO L82 PathProgramCache]: Analyzing trace with hash -352972874, now seen corresponding path program 60 times [2018-12-03 19:25:33,651 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:25:33,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:33,651 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:25:33,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:33,651 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:25:33,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:34,316 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 496 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:34,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:34,317 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:25:34,317 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:25:34,317 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:25:34,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:34,317 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:25:34,326 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:25:34,326 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:25:34,396 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:25:34,396 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:25:34,401 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:25:34,859 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 496 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:34,859 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:25:36,147 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 496 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:36,165 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:25:36,165 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 36 [2018-12-03 19:25:36,165 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:25:36,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-12-03 19:25:36,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-12-03 19:25:36,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=600, Invalid=732, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 19:25:36,166 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 37 states. [2018-12-03 19:25:36,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:25:36,827 INFO L93 Difference]: Finished difference Result 105 states and 106 transitions. [2018-12-03 19:25:36,827 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 19:25:36,828 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 96 [2018-12-03 19:25:36,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:25:36,829 INFO L225 Difference]: With dead ends: 105 [2018-12-03 19:25:36,829 INFO L226 Difference]: Without dead ends: 103 [2018-12-03 19:25:36,829 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 158 SyntacticMatches, 62 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2079 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1753, Invalid=2939, Unknown=0, NotChecked=0, Total=4692 [2018-12-03 19:25:36,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-03 19:25:36,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 99. [2018-12-03 19:25:36,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-12-03 19:25:36,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2018-12-03 19:25:36,853 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 96 [2018-12-03 19:25:36,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:25:36,853 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2018-12-03 19:25:36,853 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-12-03 19:25:36,853 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2018-12-03 19:25:36,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-12-03 19:25:36,853 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:25:36,853 INFO L402 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1] [2018-12-03 19:25:36,854 INFO L423 AbstractCegarLoop]: === Iteration 63 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:25:36,854 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:25:36,854 INFO L82 PathProgramCache]: Analyzing trace with hash 95417682, now seen corresponding path program 61 times [2018-12-03 19:25:36,854 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:25:36,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:36,854 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:25:36,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:36,855 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:25:36,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:38,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 992 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:38,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:38,424 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:25:38,425 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:25:38,425 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:25:38,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:38,425 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:25:38,434 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:25:38,434 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:25:38,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:38,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:25:40,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 992 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:40,130 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:25:41,403 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 992 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:41,422 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:25:41,422 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 97 [2018-12-03 19:25:41,422 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:25:41,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2018-12-03 19:25:41,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2018-12-03 19:25:41,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2209, Invalid=7297, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 19:25:41,424 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand 98 states. [2018-12-03 19:25:43,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:25:43,142 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2018-12-03 19:25:43,142 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-12-03 19:25:43,142 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 98 [2018-12-03 19:25:43,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:25:43,143 INFO L225 Difference]: With dead ends: 167 [2018-12-03 19:25:43,143 INFO L226 Difference]: Without dead ends: 100 [2018-12-03 19:25:43,144 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 100 SyntacticMatches, 63 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5890 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=3857, Invalid=12913, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 19:25:43,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-12-03 19:25:43,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2018-12-03 19:25:43,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-12-03 19:25:43,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2018-12-03 19:25:43,171 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 98 [2018-12-03 19:25:43,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:25:43,171 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2018-12-03 19:25:43,171 INFO L481 AbstractCegarLoop]: Interpolant automaton has 98 states. [2018-12-03 19:25:43,171 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2018-12-03 19:25:43,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-12-03 19:25:43,171 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:25:43,171 INFO L402 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1] [2018-12-03 19:25:43,172 INFO L423 AbstractCegarLoop]: === Iteration 64 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:25:43,172 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:25:43,172 INFO L82 PathProgramCache]: Analyzing trace with hash 298685129, now seen corresponding path program 62 times [2018-12-03 19:25:43,172 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:25:43,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:43,173 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:25:43,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:43,173 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:25:43,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:43,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 528 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:43,747 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:43,747 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:25:43,747 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:25:43,747 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:25:43,747 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:43,747 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:25:43,757 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:25:43,757 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:25:44,024 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-12-03 19:25:44,024 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:25:44,027 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:25:44,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 528 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:44,105 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:25:44,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 528 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:44,905 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:25:44,905 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 37 [2018-12-03 19:25:44,906 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:25:44,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 19:25:44,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 19:25:44,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=635, Invalid=771, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 19:25:44,907 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 38 states. [2018-12-03 19:25:45,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:25:45,607 INFO L93 Difference]: Finished difference Result 108 states and 109 transitions. [2018-12-03 19:25:45,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 19:25:45,608 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 99 [2018-12-03 19:25:45,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:25:45,608 INFO L225 Difference]: With dead ends: 108 [2018-12-03 19:25:45,608 INFO L226 Difference]: Without dead ends: 106 [2018-12-03 19:25:45,609 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 163 SyntacticMatches, 64 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2210 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1857, Invalid=3113, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 19:25:45,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-12-03 19:25:45,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 102. [2018-12-03 19:25:45,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-12-03 19:25:45,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2018-12-03 19:25:45,634 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 99 [2018-12-03 19:25:45,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:25:45,634 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2018-12-03 19:25:45,634 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 19:25:45,634 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2018-12-03 19:25:45,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-12-03 19:25:45,635 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:25:45,635 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1] [2018-12-03 19:25:45,635 INFO L423 AbstractCegarLoop]: === Iteration 65 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:25:45,635 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:25:45,635 INFO L82 PathProgramCache]: Analyzing trace with hash -726466651, now seen corresponding path program 63 times [2018-12-03 19:25:45,635 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:25:45,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:45,636 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:25:45,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:45,636 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:25:45,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:46,971 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 1056 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:46,971 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:46,971 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:25:46,971 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:25:46,971 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:25:46,972 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:46,972 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:25:46,981 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:25:46,982 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:25:47,060 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:25:47,060 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:25:47,064 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:25:48,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 1056 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:48,852 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:25:50,092 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 1056 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:50,111 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:25:50,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 100 [2018-12-03 19:25:50,111 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:25:50,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 19:25:50,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 19:25:50,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 19:25:50,112 INFO L87 Difference]: Start difference. First operand 102 states and 103 transitions. Second operand 101 states. [2018-12-03 19:25:52,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:25:52,492 INFO L93 Difference]: Finished difference Result 172 states and 174 transitions. [2018-12-03 19:25:52,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-12-03 19:25:52,492 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 101 [2018-12-03 19:25:52,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:25:52,493 INFO L225 Difference]: With dead ends: 172 [2018-12-03 19:25:52,493 INFO L226 Difference]: Without dead ends: 103 [2018-12-03 19:25:52,494 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 103 SyntacticMatches, 65 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6272 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 19:25:52,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-03 19:25:52,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2018-12-03 19:25:52,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2018-12-03 19:25:52,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2018-12-03 19:25:52,518 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 101 [2018-12-03 19:25:52,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:25:52,518 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2018-12-03 19:25:52,518 INFO L481 AbstractCegarLoop]: Interpolant automaton has 101 states. [2018-12-03 19:25:52,518 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2018-12-03 19:25:52,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-12-03 19:25:52,519 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:25:52,519 INFO L402 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1] [2018-12-03 19:25:52,519 INFO L423 AbstractCegarLoop]: === Iteration 66 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:25:52,519 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:25:52,519 INFO L82 PathProgramCache]: Analyzing trace with hash -1089840434, now seen corresponding path program 64 times [2018-12-03 19:25:52,519 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:25:52,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:52,520 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:25:52,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:52,520 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:25:52,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:53,355 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:53,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:53,356 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:25:53,356 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:25:53,356 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:25:53,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:53,356 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:25:53,364 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:25:53,364 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:25:53,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:53,441 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:25:53,492 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:53,492 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:25:54,305 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:54,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:25:54,324 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 38 [2018-12-03 19:25:54,324 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:25:54,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-12-03 19:25:54,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-12-03 19:25:54,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=671, Invalid=811, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 19:25:54,325 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand 39 states. [2018-12-03 19:25:55,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:25:55,057 INFO L93 Difference]: Finished difference Result 111 states and 112 transitions. [2018-12-03 19:25:55,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 19:25:55,057 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 102 [2018-12-03 19:25:55,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:25:55,058 INFO L225 Difference]: With dead ends: 111 [2018-12-03 19:25:55,058 INFO L226 Difference]: Without dead ends: 109 [2018-12-03 19:25:55,058 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 168 SyntacticMatches, 66 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2345 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1964, Invalid=3292, Unknown=0, NotChecked=0, Total=5256 [2018-12-03 19:25:55,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-12-03 19:25:55,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 105. [2018-12-03 19:25:55,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-12-03 19:25:55,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 106 transitions. [2018-12-03 19:25:55,085 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 106 transitions. Word has length 102 [2018-12-03 19:25:55,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:25:55,085 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 106 transitions. [2018-12-03 19:25:55,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-12-03 19:25:55,085 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 106 transitions. [2018-12-03 19:25:55,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-12-03 19:25:55,085 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:25:55,085 INFO L402 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1] [2018-12-03 19:25:55,086 INFO L423 AbstractCegarLoop]: === Iteration 67 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:25:55,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:25:55,086 INFO L82 PathProgramCache]: Analyzing trace with hash 635296362, now seen corresponding path program 65 times [2018-12-03 19:25:55,086 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:25:55,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:55,087 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:25:55,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:25:55,087 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:25:55,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:25:56,529 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 1122 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:56,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:56,529 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:25:56,529 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:25:56,530 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:25:56,530 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:25:56,530 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:25:56,540 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:25:56,540 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:25:56,657 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-12-03 19:25:56,657 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:25:56,660 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:25:58,807 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 1122 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:25:58,808 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:00,098 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 1122 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:00,117 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:00,118 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 103 [2018-12-03 19:26:00,118 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:00,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2018-12-03 19:26:00,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2018-12-03 19:26:00,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2483, Invalid=8229, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 19:26:00,119 INFO L87 Difference]: Start difference. First operand 105 states and 106 transitions. Second operand 104 states. [2018-12-03 19:26:02,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:02,614 INFO L93 Difference]: Finished difference Result 177 states and 179 transitions. [2018-12-03 19:26:02,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-12-03 19:26:02,614 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 104 [2018-12-03 19:26:02,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:02,615 INFO L225 Difference]: With dead ends: 177 [2018-12-03 19:26:02,615 INFO L226 Difference]: Without dead ends: 106 [2018-12-03 19:26:02,616 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 106 SyntacticMatches, 67 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6666 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=4336, Invalid=14570, Unknown=0, NotChecked=0, Total=18906 [2018-12-03 19:26:02,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-12-03 19:26:02,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-12-03 19:26:02,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-12-03 19:26:02,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2018-12-03 19:26:02,649 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 104 [2018-12-03 19:26:02,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:02,649 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2018-12-03 19:26:02,649 INFO L481 AbstractCegarLoop]: Interpolant automaton has 104 states. [2018-12-03 19:26:02,650 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2018-12-03 19:26:02,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-12-03 19:26:02,650 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:02,650 INFO L402 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1] [2018-12-03 19:26:02,651 INFO L423 AbstractCegarLoop]: === Iteration 68 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:02,651 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:02,651 INFO L82 PathProgramCache]: Analyzing trace with hash -1315487071, now seen corresponding path program 66 times [2018-12-03 19:26:02,651 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:02,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:02,652 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:02,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:02,652 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:02,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:03,452 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 595 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:03,452 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:03,452 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:03,452 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:03,452 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:03,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:03,453 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:26:03,462 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:26:03,462 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:26:03,544 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:26:03,544 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:03,549 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:03,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 595 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:03,599 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:04,452 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 595 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:04,472 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:04,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 39 [2018-12-03 19:26:04,472 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:04,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-12-03 19:26:04,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-12-03 19:26:04,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=708, Invalid=852, Unknown=0, NotChecked=0, Total=1560 [2018-12-03 19:26:04,473 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand 40 states. [2018-12-03 19:26:05,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:05,231 INFO L93 Difference]: Finished difference Result 114 states and 115 transitions. [2018-12-03 19:26:05,231 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 19:26:05,231 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 105 [2018-12-03 19:26:05,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:05,232 INFO L225 Difference]: With dead ends: 114 [2018-12-03 19:26:05,232 INFO L226 Difference]: Without dead ends: 112 [2018-12-03 19:26:05,232 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 173 SyntacticMatches, 68 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2484 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2074, Invalid=3476, Unknown=0, NotChecked=0, Total=5550 [2018-12-03 19:26:05,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-12-03 19:26:05,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 108. [2018-12-03 19:26:05,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-12-03 19:26:05,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2018-12-03 19:26:05,259 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 105 [2018-12-03 19:26:05,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:05,260 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2018-12-03 19:26:05,260 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-12-03 19:26:05,260 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2018-12-03 19:26:05,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-12-03 19:26:05,260 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:05,260 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1] [2018-12-03 19:26:05,261 INFO L423 AbstractCegarLoop]: === Iteration 69 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:05,261 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:05,261 INFO L82 PathProgramCache]: Analyzing trace with hash -1462756995, now seen corresponding path program 67 times [2018-12-03 19:26:05,261 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:05,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:05,261 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:05,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:05,262 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:05,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:06,781 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 1190 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:06,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:06,781 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:06,781 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:06,781 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:06,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:06,781 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:26:06,790 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:06,790 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:26:06,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:06,873 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:09,132 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 1190 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:09,132 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:10,522 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 1190 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:10,542 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:10,542 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 106 [2018-12-03 19:26:10,542 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:10,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-03 19:26:10,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-03 19:26:10,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 19:26:10,544 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 107 states. [2018-12-03 19:26:13,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:13,293 INFO L93 Difference]: Finished difference Result 182 states and 184 transitions. [2018-12-03 19:26:13,293 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-03 19:26:13,293 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 107 [2018-12-03 19:26:13,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:13,294 INFO L225 Difference]: With dead ends: 182 [2018-12-03 19:26:13,294 INFO L226 Difference]: Without dead ends: 109 [2018-12-03 19:26:13,294 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 109 SyntacticMatches, 69 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7072 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=4586, Invalid=15436, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 19:26:13,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-12-03 19:26:13,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2018-12-03 19:26:13,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-12-03 19:26:13,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2018-12-03 19:26:13,321 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 107 [2018-12-03 19:26:13,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:13,321 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2018-12-03 19:26:13,321 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-03 19:26:13,321 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2018-12-03 19:26:13,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2018-12-03 19:26:13,321 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:13,322 INFO L402 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1] [2018-12-03 19:26:13,322 INFO L423 AbstractCegarLoop]: === Iteration 70 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:13,322 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:13,322 INFO L82 PathProgramCache]: Analyzing trace with hash -2049527322, now seen corresponding path program 68 times [2018-12-03 19:26:13,322 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:13,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:13,323 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:13,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:13,323 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:13,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:13,991 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 630 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:13,991 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:13,992 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:13,992 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:13,992 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:13,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:13,992 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:26:14,000 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:26:14,000 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:26:14,128 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2018-12-03 19:26:14,128 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:14,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:14,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 630 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:14,205 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:15,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 630 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:15,127 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:15,127 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 40 [2018-12-03 19:26:15,127 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:15,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 19:26:15,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 19:26:15,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=746, Invalid=894, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 19:26:15,128 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 41 states. [2018-12-03 19:26:15,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:15,922 INFO L93 Difference]: Finished difference Result 117 states and 118 transitions. [2018-12-03 19:26:15,922 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 19:26:15,922 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 108 [2018-12-03 19:26:15,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:15,923 INFO L225 Difference]: With dead ends: 117 [2018-12-03 19:26:15,923 INFO L226 Difference]: Without dead ends: 115 [2018-12-03 19:26:15,924 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 178 SyntacticMatches, 70 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2627 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2187, Invalid=3665, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 19:26:15,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-12-03 19:26:15,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 111. [2018-12-03 19:26:15,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-12-03 19:26:15,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 112 transitions. [2018-12-03 19:26:15,952 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 112 transitions. Word has length 108 [2018-12-03 19:26:15,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:15,952 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 112 transitions. [2018-12-03 19:26:15,952 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 19:26:15,953 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 112 transitions. [2018-12-03 19:26:15,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-12-03 19:26:15,953 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:15,953 INFO L402 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1] [2018-12-03 19:26:15,953 INFO L423 AbstractCegarLoop]: === Iteration 71 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:15,953 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:15,954 INFO L82 PathProgramCache]: Analyzing trace with hash 1794165634, now seen corresponding path program 69 times [2018-12-03 19:26:15,954 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:15,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:15,954 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:15,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:15,954 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:15,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:17,561 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 1260 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:17,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:17,561 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:17,561 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:17,561 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:17,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:17,561 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:26:17,569 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:26:17,569 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:26:17,656 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:26:17,656 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:17,663 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:19,948 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 1260 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:19,948 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:21,409 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 1260 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:21,428 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:21,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 109 [2018-12-03 19:26:21,429 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:21,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2018-12-03 19:26:21,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2018-12-03 19:26:21,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2773, Invalid=9217, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 19:26:21,430 INFO L87 Difference]: Start difference. First operand 111 states and 112 transitions. Second operand 110 states. [2018-12-03 19:26:24,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:24,432 INFO L93 Difference]: Finished difference Result 187 states and 189 transitions. [2018-12-03 19:26:24,432 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-12-03 19:26:24,432 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 110 [2018-12-03 19:26:24,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:24,433 INFO L225 Difference]: With dead ends: 187 [2018-12-03 19:26:24,433 INFO L226 Difference]: Without dead ends: 112 [2018-12-03 19:26:24,434 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 112 SyntacticMatches, 71 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7490 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=4843, Invalid=16327, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 19:26:24,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-12-03 19:26:24,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2018-12-03 19:26:24,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-12-03 19:26:24,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2018-12-03 19:26:24,462 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 110 [2018-12-03 19:26:24,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:24,463 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2018-12-03 19:26:24,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has 110 states. [2018-12-03 19:26:24,463 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2018-12-03 19:26:24,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-12-03 19:26:24,463 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:24,463 INFO L402 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1] [2018-12-03 19:26:24,464 INFO L423 AbstractCegarLoop]: === Iteration 72 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:24,464 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:24,464 INFO L82 PathProgramCache]: Analyzing trace with hash 1836248697, now seen corresponding path program 70 times [2018-12-03 19:26:24,464 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:24,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:24,464 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:24,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:24,465 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:24,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:25,094 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 666 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:25,094 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:25,094 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:25,094 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:25,094 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:25,095 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:25,095 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:26:25,102 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:25,102 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:26:25,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:25,189 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:25,243 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 666 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:25,243 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:26,353 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 666 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:26,372 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:26,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 41 [2018-12-03 19:26:26,372 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:26,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-12-03 19:26:26,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-12-03 19:26:26,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=785, Invalid=937, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 19:26:26,373 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand 42 states. [2018-12-03 19:26:27,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:27,217 INFO L93 Difference]: Finished difference Result 120 states and 121 transitions. [2018-12-03 19:26:27,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 19:26:27,218 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 111 [2018-12-03 19:26:27,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:27,219 INFO L225 Difference]: With dead ends: 120 [2018-12-03 19:26:27,219 INFO L226 Difference]: Without dead ends: 118 [2018-12-03 19:26:27,220 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 183 SyntacticMatches, 72 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2774 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2303, Invalid=3859, Unknown=0, NotChecked=0, Total=6162 [2018-12-03 19:26:27,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-12-03 19:26:27,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 114. [2018-12-03 19:26:27,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-12-03 19:26:27,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2018-12-03 19:26:27,250 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 111 [2018-12-03 19:26:27,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:27,250 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2018-12-03 19:26:27,250 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-12-03 19:26:27,250 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2018-12-03 19:26:27,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-12-03 19:26:27,251 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:27,251 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1] [2018-12-03 19:26:27,251 INFO L423 AbstractCegarLoop]: === Iteration 73 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:27,251 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:27,251 INFO L82 PathProgramCache]: Analyzing trace with hash -596627627, now seen corresponding path program 71 times [2018-12-03 19:26:27,251 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:27,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:27,252 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:27,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:27,252 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:27,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:29,257 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 1332 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:29,257 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:29,257 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:29,257 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:29,257 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:29,257 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:29,257 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:26:29,265 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:26:29,265 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:26:29,404 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2018-12-03 19:26:29,404 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:29,408 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:31,509 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 1332 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:31,510 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:33,064 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 1332 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:33,082 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:33,083 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 112 [2018-12-03 19:26:33,083 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:33,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-12-03 19:26:33,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-12-03 19:26:33,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 19:26:33,084 INFO L87 Difference]: Start difference. First operand 114 states and 115 transitions. Second operand 113 states. [2018-12-03 19:26:36,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:36,318 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2018-12-03 19:26:36,318 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-03 19:26:36,318 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 113 [2018-12-03 19:26:36,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:36,318 INFO L225 Difference]: With dead ends: 192 [2018-12-03 19:26:36,319 INFO L226 Difference]: Without dead ends: 115 [2018-12-03 19:26:36,320 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 115 SyntacticMatches, 73 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7920 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=5107, Invalid=17243, Unknown=0, NotChecked=0, Total=22350 [2018-12-03 19:26:36,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-12-03 19:26:36,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2018-12-03 19:26:36,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-12-03 19:26:36,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2018-12-03 19:26:36,350 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 113 [2018-12-03 19:26:36,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:36,351 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2018-12-03 19:26:36,351 INFO L481 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-12-03 19:26:36,351 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2018-12-03 19:26:36,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-12-03 19:26:36,351 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:36,351 INFO L402 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1] [2018-12-03 19:26:36,351 INFO L423 AbstractCegarLoop]: === Iteration 74 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:36,352 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:36,352 INFO L82 PathProgramCache]: Analyzing trace with hash -1030548226, now seen corresponding path program 72 times [2018-12-03 19:26:36,352 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:36,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:36,352 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:36,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:36,353 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:36,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:37,535 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 703 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:37,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:37,536 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:37,536 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:37,536 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:37,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:37,536 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:26:37,544 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:26:37,544 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:26:37,632 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:26:37,632 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:37,637 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:37,710 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 703 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:37,711 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:38,791 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 703 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:38,810 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:38,811 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 42 [2018-12-03 19:26:38,811 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:38,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-12-03 19:26:38,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-12-03 19:26:38,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=825, Invalid=981, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 19:26:38,812 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand 43 states. [2018-12-03 19:26:39,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:39,772 INFO L93 Difference]: Finished difference Result 123 states and 124 transitions. [2018-12-03 19:26:39,772 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-12-03 19:26:39,772 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 114 [2018-12-03 19:26:39,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:39,774 INFO L225 Difference]: With dead ends: 123 [2018-12-03 19:26:39,774 INFO L226 Difference]: Without dead ends: 121 [2018-12-03 19:26:39,774 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 188 SyntacticMatches, 74 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2925 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2422, Invalid=4058, Unknown=0, NotChecked=0, Total=6480 [2018-12-03 19:26:39,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-12-03 19:26:39,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 117. [2018-12-03 19:26:39,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-12-03 19:26:39,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 118 transitions. [2018-12-03 19:26:39,807 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 118 transitions. Word has length 114 [2018-12-03 19:26:39,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:39,807 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 118 transitions. [2018-12-03 19:26:39,807 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-12-03 19:26:39,807 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 118 transitions. [2018-12-03 19:26:39,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-12-03 19:26:39,807 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:39,808 INFO L402 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1] [2018-12-03 19:26:39,808 INFO L423 AbstractCegarLoop]: === Iteration 75 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:39,808 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:39,808 INFO L82 PathProgramCache]: Analyzing trace with hash 1780533402, now seen corresponding path program 73 times [2018-12-03 19:26:39,808 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:39,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:39,809 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:39,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:39,809 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:39,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:41,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 1406 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:41,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:41,596 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:41,596 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:41,596 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:41,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:41,596 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:26:41,605 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:41,605 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:26:41,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:41,694 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:43,988 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 1406 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:43,989 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:45,797 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 1406 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:45,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:45,817 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 115 [2018-12-03 19:26:45,817 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:45,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2018-12-03 19:26:45,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2018-12-03 19:26:45,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3079, Invalid=10261, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 19:26:45,818 INFO L87 Difference]: Start difference. First operand 117 states and 118 transitions. Second operand 116 states. [2018-12-03 19:26:49,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:49,012 INFO L93 Difference]: Finished difference Result 197 states and 199 transitions. [2018-12-03 19:26:49,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2018-12-03 19:26:49,012 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 116 [2018-12-03 19:26:49,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:49,013 INFO L225 Difference]: With dead ends: 197 [2018-12-03 19:26:49,013 INFO L226 Difference]: Without dead ends: 118 [2018-12-03 19:26:49,014 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 118 SyntacticMatches, 75 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8362 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=5378, Invalid=18184, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 19:26:49,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-12-03 19:26:49,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2018-12-03 19:26:49,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-12-03 19:26:49,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2018-12-03 19:26:49,061 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 116 [2018-12-03 19:26:49,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:49,061 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2018-12-03 19:26:49,061 INFO L481 AbstractCegarLoop]: Interpolant automaton has 116 states. [2018-12-03 19:26:49,061 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2018-12-03 19:26:49,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-12-03 19:26:49,062 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:49,062 INFO L402 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1] [2018-12-03 19:26:49,062 INFO L423 AbstractCegarLoop]: === Iteration 76 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:49,062 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:49,062 INFO L82 PathProgramCache]: Analyzing trace with hash -1591437743, now seen corresponding path program 74 times [2018-12-03 19:26:49,062 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:49,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:49,063 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:49,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:49,063 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:49,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:49,872 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 741 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:49,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:49,873 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:49,873 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:49,873 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:49,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:49,873 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:26:49,882 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:26:49,882 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:26:50,030 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-12-03 19:26:50,030 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:50,034 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:50,093 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 741 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:50,093 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:51,157 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 741 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:51,176 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:51,176 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 43 [2018-12-03 19:26:51,177 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:51,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 19:26:51,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 19:26:51,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=866, Invalid=1026, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 19:26:51,177 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand 44 states. [2018-12-03 19:26:52,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:52,068 INFO L93 Difference]: Finished difference Result 126 states and 127 transitions. [2018-12-03 19:26:52,068 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 19:26:52,068 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 117 [2018-12-03 19:26:52,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:52,069 INFO L225 Difference]: With dead ends: 126 [2018-12-03 19:26:52,069 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 19:26:52,069 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 193 SyntacticMatches, 76 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3080 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2544, Invalid=4262, Unknown=0, NotChecked=0, Total=6806 [2018-12-03 19:26:52,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 19:26:52,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 120. [2018-12-03 19:26:52,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-12-03 19:26:52,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2018-12-03 19:26:52,104 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 117 [2018-12-03 19:26:52,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:52,104 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2018-12-03 19:26:52,104 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 19:26:52,104 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2018-12-03 19:26:52,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-12-03 19:26:52,105 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:52,105 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1] [2018-12-03 19:26:52,105 INFO L423 AbstractCegarLoop]: === Iteration 77 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:52,105 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:52,106 INFO L82 PathProgramCache]: Analyzing trace with hash -363380435, now seen corresponding path program 75 times [2018-12-03 19:26:52,106 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:52,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:52,106 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:52,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:52,107 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:52,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:54,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 1482 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:54,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:54,002 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:54,002 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:54,002 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:54,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:54,002 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:26:54,011 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:26:54,011 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:26:54,103 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:26:54,103 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:54,109 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:56,599 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 1482 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:56,599 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:58,353 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 1482 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:58,372 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:58,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 118 [2018-12-03 19:26:58,372 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:58,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2018-12-03 19:26:58,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2018-12-03 19:26:58,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 19:26:58,374 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand 119 states. [2018-12-03 19:27:01,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:01,942 INFO L93 Difference]: Finished difference Result 202 states and 204 transitions. [2018-12-03 19:27:01,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-12-03 19:27:01,943 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 119 [2018-12-03 19:27:01,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:01,943 INFO L225 Difference]: With dead ends: 202 [2018-12-03 19:27:01,943 INFO L226 Difference]: Without dead ends: 121 [2018-12-03 19:27:01,944 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 121 SyntacticMatches, 77 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8816 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=5656, Invalid=19150, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 19:27:01,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-12-03 19:27:01,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2018-12-03 19:27:01,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2018-12-03 19:27:01,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 122 transitions. [2018-12-03 19:27:01,977 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 122 transitions. Word has length 119 [2018-12-03 19:27:01,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:01,977 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 122 transitions. [2018-12-03 19:27:01,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has 119 states. [2018-12-03 19:27:01,978 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 122 transitions. [2018-12-03 19:27:01,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-12-03 19:27:01,978 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:01,978 INFO L402 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1] [2018-12-03 19:27:01,978 INFO L423 AbstractCegarLoop]: === Iteration 78 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:01,979 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:01,979 INFO L82 PathProgramCache]: Analyzing trace with hash 234325014, now seen corresponding path program 76 times [2018-12-03 19:27:01,979 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:01,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:01,980 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:01,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:01,980 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:02,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:02,837 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 780 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:02,837 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:02,837 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:02,837 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:02,837 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:02,837 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:02,838 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:27:02,846 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:02,846 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:02,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:02,941 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:02,999 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 780 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:02,999 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:04,103 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 780 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:04,122 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:04,122 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 44 [2018-12-03 19:27:04,122 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:04,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 19:27:04,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 19:27:04,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=908, Invalid=1072, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 19:27:04,123 INFO L87 Difference]: Start difference. First operand 121 states and 122 transitions. Second operand 45 states. [2018-12-03 19:27:05,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:05,242 INFO L93 Difference]: Finished difference Result 129 states and 130 transitions. [2018-12-03 19:27:05,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 19:27:05,242 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 120 [2018-12-03 19:27:05,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:05,244 INFO L225 Difference]: With dead ends: 129 [2018-12-03 19:27:05,244 INFO L226 Difference]: Without dead ends: 127 [2018-12-03 19:27:05,245 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 198 SyntacticMatches, 78 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3239 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2669, Invalid=4471, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 19:27:05,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-12-03 19:27:05,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 123. [2018-12-03 19:27:05,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-12-03 19:27:05,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 124 transitions. [2018-12-03 19:27:05,279 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 124 transitions. Word has length 120 [2018-12-03 19:27:05,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:05,279 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 124 transitions. [2018-12-03 19:27:05,279 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 19:27:05,280 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 124 transitions. [2018-12-03 19:27:05,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-12-03 19:27:05,280 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:05,280 INFO L402 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1] [2018-12-03 19:27:05,280 INFO L423 AbstractCegarLoop]: === Iteration 79 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:05,280 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:05,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1847972274, now seen corresponding path program 77 times [2018-12-03 19:27:05,281 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:05,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:05,281 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:05,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:05,281 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:05,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:07,246 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 1560 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:07,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:07,247 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:07,247 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:07,247 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:07,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:07,247 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:27:07,256 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:07,256 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:07,416 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-12-03 19:27:07,416 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:07,421 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:10,141 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 1560 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:10,141 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:12,006 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 1560 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:12,027 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:12,027 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 121 [2018-12-03 19:27:12,027 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:12,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2018-12-03 19:27:12,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2018-12-03 19:27:12,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3401, Invalid=11361, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 19:27:12,028 INFO L87 Difference]: Start difference. First operand 123 states and 124 transitions. Second operand 122 states. [2018-12-03 19:27:15,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:15,687 INFO L93 Difference]: Finished difference Result 207 states and 209 transitions. [2018-12-03 19:27:15,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2018-12-03 19:27:15,688 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 122 [2018-12-03 19:27:15,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:15,688 INFO L225 Difference]: With dead ends: 207 [2018-12-03 19:27:15,688 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 19:27:15,689 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 124 SyntacticMatches, 79 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9282 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=5941, Invalid=20141, Unknown=0, NotChecked=0, Total=26082 [2018-12-03 19:27:15,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 19:27:15,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-12-03 19:27:15,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-12-03 19:27:15,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2018-12-03 19:27:15,752 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 122 [2018-12-03 19:27:15,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:15,752 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2018-12-03 19:27:15,752 INFO L481 AbstractCegarLoop]: Interpolant automaton has 122 states. [2018-12-03 19:27:15,752 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2018-12-03 19:27:15,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-12-03 19:27:15,752 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:15,753 INFO L402 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1] [2018-12-03 19:27:15,753 INFO L423 AbstractCegarLoop]: === Iteration 80 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:15,753 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:15,753 INFO L82 PathProgramCache]: Analyzing trace with hash 1156594217, now seen corresponding path program 78 times [2018-12-03 19:27:15,753 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:15,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:15,754 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:15,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:15,754 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:15,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:16,545 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 820 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:16,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:16,545 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:16,545 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:16,546 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:16,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:16,546 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:27:16,554 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:16,554 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:16,652 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:16,652 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:16,657 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:16,709 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 820 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:16,709 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:17,946 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 820 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:17,964 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:17,965 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 45 [2018-12-03 19:27:17,965 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:17,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-12-03 19:27:17,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-12-03 19:27:17,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=951, Invalid=1119, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 19:27:17,966 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand 46 states. [2018-12-03 19:27:18,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:18,913 INFO L93 Difference]: Finished difference Result 132 states and 133 transitions. [2018-12-03 19:27:18,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-12-03 19:27:18,913 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 123 [2018-12-03 19:27:18,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:18,914 INFO L225 Difference]: With dead ends: 132 [2018-12-03 19:27:18,914 INFO L226 Difference]: Without dead ends: 130 [2018-12-03 19:27:18,915 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 203 SyntacticMatches, 80 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3402 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2797, Invalid=4685, Unknown=0, NotChecked=0, Total=7482 [2018-12-03 19:27:18,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-12-03 19:27:18,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 126. [2018-12-03 19:27:18,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-12-03 19:27:18,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2018-12-03 19:27:18,965 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 123 [2018-12-03 19:27:18,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:18,965 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2018-12-03 19:27:18,965 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-12-03 19:27:18,965 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2018-12-03 19:27:18,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-12-03 19:27:18,966 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:18,966 INFO L402 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1] [2018-12-03 19:27:18,966 INFO L423 AbstractCegarLoop]: === Iteration 81 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:18,966 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:18,967 INFO L82 PathProgramCache]: Analyzing trace with hash -909553915, now seen corresponding path program 79 times [2018-12-03 19:27:18,967 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:18,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:18,968 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:18,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:18,968 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:19,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:21,327 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 1640 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:21,327 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:21,327 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:21,327 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:21,327 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:21,327 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:21,327 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:27:21,336 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:21,336 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:21,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:21,432 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:23,990 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 1640 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:23,990 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:26,198 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 1640 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:26,216 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:26,217 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 124 [2018-12-03 19:27:26,217 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:26,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 125 states [2018-12-03 19:27:26,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2018-12-03 19:27:26,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3568, Invalid=11932, Unknown=0, NotChecked=0, Total=15500 [2018-12-03 19:27:26,218 INFO L87 Difference]: Start difference. First operand 126 states and 127 transitions. Second operand 125 states. [2018-12-03 19:27:29,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:29,828 INFO L93 Difference]: Finished difference Result 212 states and 214 transitions. [2018-12-03 19:27:29,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-12-03 19:27:29,828 INFO L78 Accepts]: Start accepts. Automaton has 125 states. Word has length 125 [2018-12-03 19:27:29,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:29,829 INFO L225 Difference]: With dead ends: 212 [2018-12-03 19:27:29,829 INFO L226 Difference]: Without dead ends: 127 [2018-12-03 19:27:29,830 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 127 SyntacticMatches, 81 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9760 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=6233, Invalid=21157, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 19:27:29,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-12-03 19:27:29,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2018-12-03 19:27:29,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-12-03 19:27:29,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2018-12-03 19:27:29,876 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 125 [2018-12-03 19:27:29,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:29,876 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2018-12-03 19:27:29,876 INFO L481 AbstractCegarLoop]: Interpolant automaton has 125 states. [2018-12-03 19:27:29,876 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2018-12-03 19:27:29,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-12-03 19:27:29,877 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:29,877 INFO L402 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1] [2018-12-03 19:27:29,878 INFO L423 AbstractCegarLoop]: === Iteration 82 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:29,878 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:29,878 INFO L82 PathProgramCache]: Analyzing trace with hash 909901614, now seen corresponding path program 80 times [2018-12-03 19:27:29,878 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:29,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:29,879 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:29,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:29,879 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:29,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:30,921 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 861 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:30,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:30,921 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:30,922 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:30,922 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:30,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:30,922 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:27:30,931 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:30,931 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:31,097 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-12-03 19:27:31,097 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:31,101 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:31,162 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 861 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:31,162 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:32,396 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 861 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:32,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:32,415 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 44] total 46 [2018-12-03 19:27:32,415 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:32,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 19:27:32,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 19:27:32,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=995, Invalid=1167, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 19:27:32,416 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand 47 states. [2018-12-03 19:27:33,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:33,410 INFO L93 Difference]: Finished difference Result 135 states and 136 transitions. [2018-12-03 19:27:33,410 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 19:27:33,410 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 126 [2018-12-03 19:27:33,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:33,411 INFO L225 Difference]: With dead ends: 135 [2018-12-03 19:27:33,411 INFO L226 Difference]: Without dead ends: 133 [2018-12-03 19:27:33,412 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 208 SyntacticMatches, 82 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3569 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2928, Invalid=4904, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 19:27:33,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-12-03 19:27:33,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 129. [2018-12-03 19:27:33,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-12-03 19:27:33,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 130 transitions. [2018-12-03 19:27:33,453 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 130 transitions. Word has length 126 [2018-12-03 19:27:33,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:33,453 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 130 transitions. [2018-12-03 19:27:33,453 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 19:27:33,453 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 130 transitions. [2018-12-03 19:27:33,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-12-03 19:27:33,454 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:33,454 INFO L402 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1] [2018-12-03 19:27:33,454 INFO L423 AbstractCegarLoop]: === Iteration 83 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:33,454 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:33,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1757944118, now seen corresponding path program 81 times [2018-12-03 19:27:33,455 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:33,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:33,455 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:33,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:33,456 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:33,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:35,995 INFO L134 CoverageAnalysis]: Checked inductivity of 2583 backedges. 1722 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:35,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:35,995 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:35,995 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:35,995 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:35,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:35,995 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:27:36,003 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:36,003 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:36,095 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:36,096 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:36,102 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:38,750 INFO L134 CoverageAnalysis]: Checked inductivity of 2583 backedges. 1722 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:38,750 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:41,111 INFO L134 CoverageAnalysis]: Checked inductivity of 2583 backedges. 1722 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:41,130 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:41,130 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 127 [2018-12-03 19:27:41,130 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:41,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2018-12-03 19:27:41,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2018-12-03 19:27:41,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3739, Invalid=12517, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 19:27:41,132 INFO L87 Difference]: Start difference. First operand 129 states and 130 transitions. Second operand 128 states. [2018-12-03 19:27:44,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:44,879 INFO L93 Difference]: Finished difference Result 217 states and 219 transitions. [2018-12-03 19:27:44,879 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-03 19:27:44,879 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 128 [2018-12-03 19:27:44,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:44,880 INFO L225 Difference]: With dead ends: 217 [2018-12-03 19:27:44,880 INFO L226 Difference]: Without dead ends: 130 [2018-12-03 19:27:44,882 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 130 SyntacticMatches, 83 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10250 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=6532, Invalid=22198, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 19:27:44,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-12-03 19:27:44,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2018-12-03 19:27:44,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-12-03 19:27:44,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-12-03 19:27:44,932 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 128 [2018-12-03 19:27:44,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:44,932 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-12-03 19:27:44,932 INFO L481 AbstractCegarLoop]: Interpolant automaton has 128 states. [2018-12-03 19:27:44,932 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-12-03 19:27:44,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-12-03 19:27:44,933 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:44,933 INFO L402 BasicCegarLoop]: trace histogram [42, 42, 41, 1, 1, 1, 1] [2018-12-03 19:27:44,934 INFO L423 AbstractCegarLoop]: === Iteration 84 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:44,934 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:44,934 INFO L82 PathProgramCache]: Analyzing trace with hash -845555199, now seen corresponding path program 82 times [2018-12-03 19:27:44,934 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:44,935 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:44,935 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:44,935 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:44,935 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:44,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:46,276 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 903 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:46,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:46,276 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:46,276 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:46,276 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:46,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:46,276 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:27:46,285 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:46,285 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:46,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:46,384 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:46,446 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 903 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:46,446 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:47,816 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 903 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:47,835 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:47,836 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45, 45] total 47 [2018-12-03 19:27:47,836 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:47,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-12-03 19:27:47,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-12-03 19:27:47,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1040, Invalid=1216, Unknown=0, NotChecked=0, Total=2256 [2018-12-03 19:27:47,837 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 48 states. [2018-12-03 19:27:48,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:48,868 INFO L93 Difference]: Finished difference Result 138 states and 139 transitions. [2018-12-03 19:27:48,868 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 19:27:48,868 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 129 [2018-12-03 19:27:48,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:48,869 INFO L225 Difference]: With dead ends: 138 [2018-12-03 19:27:48,870 INFO L226 Difference]: Without dead ends: 136 [2018-12-03 19:27:48,870 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 213 SyntacticMatches, 84 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3740 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3062, Invalid=5128, Unknown=0, NotChecked=0, Total=8190 [2018-12-03 19:27:48,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-12-03 19:27:48,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 132. [2018-12-03 19:27:48,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-12-03 19:27:48,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2018-12-03 19:27:48,909 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 129 [2018-12-03 19:27:48,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:48,910 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2018-12-03 19:27:48,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-12-03 19:27:48,910 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2018-12-03 19:27:48,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-12-03 19:27:48,910 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:48,911 INFO L402 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1] [2018-12-03 19:27:48,911 INFO L423 AbstractCegarLoop]: === Iteration 85 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:48,911 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:48,911 INFO L82 PathProgramCache]: Analyzing trace with hash -829794083, now seen corresponding path program 83 times [2018-12-03 19:27:48,911 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:48,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:48,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:48,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:48,912 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:48,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:51,512 INFO L134 CoverageAnalysis]: Checked inductivity of 2709 backedges. 1806 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:51,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:51,513 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:51,513 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:51,513 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:51,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:51,513 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:27:51,522 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:51,522 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:51,700 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2018-12-03 19:27:51,700 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:51,705 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:54,477 INFO L134 CoverageAnalysis]: Checked inductivity of 2709 backedges. 1806 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:54,478 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:56,850 INFO L134 CoverageAnalysis]: Checked inductivity of 2709 backedges. 1806 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:56,869 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:56,869 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 130 [2018-12-03 19:27:56,870 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:56,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2018-12-03 19:27:56,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2018-12-03 19:27:56,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3914, Invalid=13116, Unknown=0, NotChecked=0, Total=17030 [2018-12-03 19:27:56,871 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand 131 states. [2018-12-03 19:27:59,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:59,831 INFO L93 Difference]: Finished difference Result 222 states and 224 transitions. [2018-12-03 19:27:59,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2018-12-03 19:27:59,831 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 131 [2018-12-03 19:27:59,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:59,832 INFO L225 Difference]: With dead ends: 222 [2018-12-03 19:27:59,833 INFO L226 Difference]: Without dead ends: 133 [2018-12-03 19:27:59,834 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 133 SyntacticMatches, 85 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10752 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=6838, Invalid=23264, Unknown=0, NotChecked=0, Total=30102 [2018-12-03 19:27:59,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-12-03 19:27:59,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2018-12-03 19:27:59,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-12-03 19:27:59,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2018-12-03 19:27:59,874 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 131 [2018-12-03 19:27:59,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:59,874 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2018-12-03 19:27:59,874 INFO L481 AbstractCegarLoop]: Interpolant automaton has 131 states. [2018-12-03 19:27:59,875 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2018-12-03 19:27:59,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-12-03 19:27:59,875 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:59,875 INFO L402 BasicCegarLoop]: trace histogram [43, 43, 42, 1, 1, 1, 1] [2018-12-03 19:27:59,876 INFO L423 AbstractCegarLoop]: === Iteration 86 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:59,876 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:59,876 INFO L82 PathProgramCache]: Analyzing trace with hash 1595442758, now seen corresponding path program 84 times [2018-12-03 19:27:59,876 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:59,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:59,877 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:59,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:59,877 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:59,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:01,003 INFO L134 CoverageAnalysis]: Checked inductivity of 2752 backedges. 946 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:01,003 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:01,004 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:01,004 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:01,004 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:01,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:01,004 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:28:01,012 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:28:01,012 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:28:01,117 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:28:01,117 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:01,124 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:01,186 INFO L134 CoverageAnalysis]: Checked inductivity of 2752 backedges. 946 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:01,187 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:02,558 INFO L134 CoverageAnalysis]: Checked inductivity of 2752 backedges. 946 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:02,580 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:02,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 48 [2018-12-03 19:28:02,580 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:02,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-12-03 19:28:02,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-12-03 19:28:02,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1086, Invalid=1266, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 19:28:02,581 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand 49 states. [2018-12-03 19:28:03,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:03,636 INFO L93 Difference]: Finished difference Result 141 states and 142 transitions. [2018-12-03 19:28:03,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 19:28:03,636 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 132 [2018-12-03 19:28:03,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:03,637 INFO L225 Difference]: With dead ends: 141 [2018-12-03 19:28:03,637 INFO L226 Difference]: Without dead ends: 139 [2018-12-03 19:28:03,638 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 218 SyntacticMatches, 86 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3915 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3199, Invalid=5357, Unknown=0, NotChecked=0, Total=8556 [2018-12-03 19:28:03,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-12-03 19:28:03,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 135. [2018-12-03 19:28:03,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-12-03 19:28:03,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2018-12-03 19:28:03,678 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 132 [2018-12-03 19:28:03,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:03,678 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2018-12-03 19:28:03,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-12-03 19:28:03,678 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2018-12-03 19:28:03,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-12-03 19:28:03,679 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:03,679 INFO L402 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1] [2018-12-03 19:28:03,680 INFO L423 AbstractCegarLoop]: === Iteration 87 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:03,680 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:03,680 INFO L82 PathProgramCache]: Analyzing trace with hash -82901022, now seen corresponding path program 85 times [2018-12-03 19:28:03,680 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:03,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:03,681 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:03,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:03,681 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:03,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:06,426 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1892 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:06,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:06,427 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:06,427 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:06,427 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:06,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:06,427 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:28:06,436 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:06,436 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:28:06,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:06,537 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:09,476 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1892 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:09,476 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:12,032 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1892 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:12,051 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:12,052 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 133 [2018-12-03 19:28:12,052 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:12,052 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2018-12-03 19:28:12,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2018-12-03 19:28:12,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 19:28:12,054 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand 134 states. [2018-12-03 19:28:15,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:15,124 INFO L93 Difference]: Finished difference Result 227 states and 229 transitions. [2018-12-03 19:28:15,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2018-12-03 19:28:15,125 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 134 [2018-12-03 19:28:15,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:15,125 INFO L225 Difference]: With dead ends: 227 [2018-12-03 19:28:15,125 INFO L226 Difference]: Without dead ends: 136 [2018-12-03 19:28:15,126 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 136 SyntacticMatches, 87 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11266 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=7151, Invalid=24355, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 19:28:15,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-12-03 19:28:15,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2018-12-03 19:28:15,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-12-03 19:28:15,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2018-12-03 19:28:15,165 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 134 [2018-12-03 19:28:15,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:15,166 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2018-12-03 19:28:15,166 INFO L481 AbstractCegarLoop]: Interpolant automaton has 134 states. [2018-12-03 19:28:15,166 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2018-12-03 19:28:15,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-12-03 19:28:15,166 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:15,166 INFO L402 BasicCegarLoop]: trace histogram [44, 44, 43, 1, 1, 1, 1] [2018-12-03 19:28:15,166 INFO L423 AbstractCegarLoop]: === Iteration 88 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:15,167 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:15,167 INFO L82 PathProgramCache]: Analyzing trace with hash 207975897, now seen corresponding path program 86 times [2018-12-03 19:28:15,167 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:15,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:15,167 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:15,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:15,168 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:15,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:16,265 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 990 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:16,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:16,266 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:16,266 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:16,266 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:16,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:16,266 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:28:16,275 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:28:16,275 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:28:16,457 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2018-12-03 19:28:16,458 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:16,462 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:16,517 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 990 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:16,517 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:17,963 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 990 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:17,983 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:17,983 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 47] total 49 [2018-12-03 19:28:17,984 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:17,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 19:28:17,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 19:28:17,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1133, Invalid=1317, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 19:28:17,984 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand 50 states. [2018-12-03 19:28:19,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:19,079 INFO L93 Difference]: Finished difference Result 144 states and 145 transitions. [2018-12-03 19:28:19,079 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 19:28:19,079 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 135 [2018-12-03 19:28:19,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:19,081 INFO L225 Difference]: With dead ends: 144 [2018-12-03 19:28:19,081 INFO L226 Difference]: Without dead ends: 142 [2018-12-03 19:28:19,082 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 223 SyntacticMatches, 88 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4094 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3339, Invalid=5591, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 19:28:19,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-12-03 19:28:19,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 138. [2018-12-03 19:28:19,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-12-03 19:28:19,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 139 transitions. [2018-12-03 19:28:19,125 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 139 transitions. Word has length 135 [2018-12-03 19:28:19,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:19,125 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 139 transitions. [2018-12-03 19:28:19,125 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 19:28:19,125 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 139 transitions. [2018-12-03 19:28:19,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-12-03 19:28:19,125 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:19,126 INFO L402 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1] [2018-12-03 19:28:19,126 INFO L423 AbstractCegarLoop]: === Iteration 89 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:19,126 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:19,126 INFO L82 PathProgramCache]: Analyzing trace with hash -1998692683, now seen corresponding path program 87 times [2018-12-03 19:28:19,126 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:19,127 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:19,127 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:19,127 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:19,127 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:19,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:21,976 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 1980 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:21,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:21,977 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:21,977 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:21,977 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:21,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:21,977 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:28:21,987 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:28:21,987 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:28:22,096 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:28:22,096 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:22,102 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:25,228 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 1980 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:25,228 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:27,797 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 1980 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:27,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:27,817 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 136 [2018-12-03 19:28:27,818 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:27,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 137 states [2018-12-03 19:28:27,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2018-12-03 19:28:27,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4276, Invalid=14356, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 19:28:27,819 INFO L87 Difference]: Start difference. First operand 138 states and 139 transitions. Second operand 137 states. [2018-12-03 19:28:31,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:31,056 INFO L93 Difference]: Finished difference Result 232 states and 234 transitions. [2018-12-03 19:28:31,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2018-12-03 19:28:31,056 INFO L78 Accepts]: Start accepts. Automaton has 137 states. Word has length 137 [2018-12-03 19:28:31,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:31,057 INFO L225 Difference]: With dead ends: 232 [2018-12-03 19:28:31,057 INFO L226 Difference]: Without dead ends: 139 [2018-12-03 19:28:31,058 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 139 SyntacticMatches, 89 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11792 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=7471, Invalid=25471, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 19:28:31,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-12-03 19:28:31,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-12-03 19:28:31,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-12-03 19:28:31,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2018-12-03 19:28:31,104 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 137 [2018-12-03 19:28:31,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:31,105 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2018-12-03 19:28:31,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has 137 states. [2018-12-03 19:28:31,105 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2018-12-03 19:28:31,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2018-12-03 19:28:31,105 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:31,106 INFO L402 BasicCegarLoop]: trace histogram [45, 45, 44, 1, 1, 1, 1] [2018-12-03 19:28:31,106 INFO L423 AbstractCegarLoop]: === Iteration 90 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:31,106 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:31,106 INFO L82 PathProgramCache]: Analyzing trace with hash 566565214, now seen corresponding path program 88 times [2018-12-03 19:28:31,106 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:31,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:31,107 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:31,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:31,107 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:31,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:32,322 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1035 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:32,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:32,322 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:32,322 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:32,322 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:32,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:32,322 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:28:32,331 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:32,331 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:28:32,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:32,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:32,506 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1035 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:32,506 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:34,009 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1035 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:34,028 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:34,028 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 50 [2018-12-03 19:28:34,028 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:34,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-12-03 19:28:34,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-12-03 19:28:34,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1181, Invalid=1369, Unknown=0, NotChecked=0, Total=2550 [2018-12-03 19:28:34,029 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand 51 states. [2018-12-03 19:28:35,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:35,139 INFO L93 Difference]: Finished difference Result 147 states and 148 transitions. [2018-12-03 19:28:35,139 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 19:28:35,139 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 138 [2018-12-03 19:28:35,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:35,140 INFO L225 Difference]: With dead ends: 147 [2018-12-03 19:28:35,141 INFO L226 Difference]: Without dead ends: 145 [2018-12-03 19:28:35,141 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 228 SyntacticMatches, 90 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4277 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3482, Invalid=5830, Unknown=0, NotChecked=0, Total=9312 [2018-12-03 19:28:35,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-12-03 19:28:35,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 141. [2018-12-03 19:28:35,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-12-03 19:28:35,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 142 transitions. [2018-12-03 19:28:35,187 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 142 transitions. Word has length 138 [2018-12-03 19:28:35,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:35,187 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 142 transitions. [2018-12-03 19:28:35,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-12-03 19:28:35,187 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 142 transitions. [2018-12-03 19:28:35,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-12-03 19:28:35,188 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:35,188 INFO L402 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1] [2018-12-03 19:28:35,188 INFO L423 AbstractCegarLoop]: === Iteration 91 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:35,188 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:35,188 INFO L82 PathProgramCache]: Analyzing trace with hash -991742726, now seen corresponding path program 89 times [2018-12-03 19:28:35,189 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:35,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:35,189 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:35,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:35,189 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:35,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:38,021 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 2070 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:38,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:38,021 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:38,022 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:38,022 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:38,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:38,022 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:28:38,030 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:28:38,030 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:28:38,226 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2018-12-03 19:28:38,227 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:38,232 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:41,377 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 2070 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:41,377 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:44,025 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 2070 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:44,044 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:44,044 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 139 [2018-12-03 19:28:44,044 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:44,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2018-12-03 19:28:44,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2018-12-03 19:28:44,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4463, Invalid=14997, Unknown=0, NotChecked=0, Total=19460 [2018-12-03 19:28:44,046 INFO L87 Difference]: Start difference. First operand 141 states and 142 transitions. Second operand 140 states. [2018-12-03 19:28:47,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:47,521 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2018-12-03 19:28:47,521 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2018-12-03 19:28:47,521 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 140 [2018-12-03 19:28:47,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:47,522 INFO L225 Difference]: With dead ends: 237 [2018-12-03 19:28:47,522 INFO L226 Difference]: Without dead ends: 142 [2018-12-03 19:28:47,523 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 142 SyntacticMatches, 91 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12330 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=7798, Invalid=26612, Unknown=0, NotChecked=0, Total=34410 [2018-12-03 19:28:47,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-12-03 19:28:47,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-12-03 19:28:47,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-12-03 19:28:47,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2018-12-03 19:28:47,566 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 140 [2018-12-03 19:28:47,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:47,566 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2018-12-03 19:28:47,566 INFO L481 AbstractCegarLoop]: Interpolant automaton has 140 states. [2018-12-03 19:28:47,566 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2018-12-03 19:28:47,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-12-03 19:28:47,566 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:47,566 INFO L402 BasicCegarLoop]: trace histogram [46, 46, 45, 1, 1, 1, 1] [2018-12-03 19:28:47,567 INFO L423 AbstractCegarLoop]: === Iteration 92 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:47,567 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:47,567 INFO L82 PathProgramCache]: Analyzing trace with hash 253169073, now seen corresponding path program 90 times [2018-12-03 19:28:47,567 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:47,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:47,568 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:47,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:47,568 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:47,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:48,742 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1081 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:48,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:48,743 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:48,743 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:48,743 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:48,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:48,743 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:28:48,751 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:28:48,752 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:28:48,864 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:28:48,864 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:48,870 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:48,930 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1081 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:48,930 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:50,547 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1081 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:50,566 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:50,566 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49, 49] total 51 [2018-12-03 19:28:50,566 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:50,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-12-03 19:28:50,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-12-03 19:28:50,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1230, Invalid=1422, Unknown=0, NotChecked=0, Total=2652 [2018-12-03 19:28:50,567 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand 52 states. [2018-12-03 19:28:51,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:51,727 INFO L93 Difference]: Finished difference Result 150 states and 151 transitions. [2018-12-03 19:28:51,728 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-12-03 19:28:51,728 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 141 [2018-12-03 19:28:51,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:51,729 INFO L225 Difference]: With dead ends: 150 [2018-12-03 19:28:51,729 INFO L226 Difference]: Without dead ends: 148 [2018-12-03 19:28:51,730 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 233 SyntacticMatches, 92 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4464 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=3628, Invalid=6074, Unknown=0, NotChecked=0, Total=9702 [2018-12-03 19:28:51,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-12-03 19:28:51,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 144. [2018-12-03 19:28:51,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-12-03 19:28:51,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 145 transitions. [2018-12-03 19:28:51,775 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 145 transitions. Word has length 141 [2018-12-03 19:28:51,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:51,775 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 145 transitions. [2018-12-03 19:28:51,775 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-12-03 19:28:51,775 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 145 transitions. [2018-12-03 19:28:51,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-12-03 19:28:51,776 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:51,776 INFO L402 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1] [2018-12-03 19:28:51,776 INFO L423 AbstractCegarLoop]: === Iteration 93 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:51,776 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:51,776 INFO L82 PathProgramCache]: Analyzing trace with hash -1517723507, now seen corresponding path program 91 times [2018-12-03 19:28:51,776 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:51,777 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:51,777 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:51,777 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:51,777 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:51,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:54,690 INFO L134 CoverageAnalysis]: Checked inductivity of 3243 backedges. 2162 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:54,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:54,690 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:54,690 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:54,691 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:54,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:54,691 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 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:28:54,717 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:54,717 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:28:54,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:54,826 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:58,448 INFO L134 CoverageAnalysis]: Checked inductivity of 3243 backedges. 2162 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:58,448 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:00,956 INFO L134 CoverageAnalysis]: Checked inductivity of 3243 backedges. 2162 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:00,975 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:00,976 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 142 [2018-12-03 19:29:00,976 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:00,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 143 states [2018-12-03 19:29:00,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2018-12-03 19:29:00,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4654, Invalid=15652, Unknown=0, NotChecked=0, Total=20306 [2018-12-03 19:29:00,977 INFO L87 Difference]: Start difference. First operand 144 states and 145 transitions. Second operand 143 states. [2018-12-03 19:29:04,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:04,675 INFO L93 Difference]: Finished difference Result 242 states and 244 transitions. [2018-12-03 19:29:04,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2018-12-03 19:29:04,675 INFO L78 Accepts]: Start accepts. Automaton has 143 states. Word has length 143 [2018-12-03 19:29:04,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:04,675 INFO L225 Difference]: With dead ends: 242 [2018-12-03 19:29:04,675 INFO L226 Difference]: Without dead ends: 145 [2018-12-03 19:29:04,677 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 145 SyntacticMatches, 93 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12880 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=8132, Invalid=27778, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 19:29:04,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-12-03 19:29:04,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 145. [2018-12-03 19:29:04,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2018-12-03 19:29:04,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 146 transitions. [2018-12-03 19:29:04,721 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 146 transitions. Word has length 143 [2018-12-03 19:29:04,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:04,721 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 146 transitions. [2018-12-03 19:29:04,721 INFO L481 AbstractCegarLoop]: Interpolant automaton has 143 states. [2018-12-03 19:29:04,721 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 146 transitions. [2018-12-03 19:29:04,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2018-12-03 19:29:04,722 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:04,722 INFO L402 BasicCegarLoop]: trace histogram [47, 47, 46, 1, 1, 1, 1] [2018-12-03 19:29:04,722 INFO L423 AbstractCegarLoop]: === Iteration 94 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:04,722 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:04,722 INFO L82 PathProgramCache]: Analyzing trace with hash -1392920458, now seen corresponding path program 92 times [2018-12-03 19:29:04,722 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:04,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:04,723 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:04,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:04,723 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:04,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:05,798 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1128 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:05,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:05,798 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:05,798 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:05,798 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:05,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:05,798 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 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:29:05,806 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:29:05,806 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:29:06,022 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2018-12-03 19:29:06,022 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:29:06,027 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:06,086 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1128 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:06,086 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:07,968 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1128 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:07,987 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:07,987 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 52 [2018-12-03 19:29:07,987 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:07,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 19:29:07,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 19:29:07,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1280, Invalid=1476, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 19:29:07,988 INFO L87 Difference]: Start difference. First operand 145 states and 146 transitions. Second operand 53 states. [2018-12-03 19:29:09,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:09,189 INFO L93 Difference]: Finished difference Result 153 states and 154 transitions. [2018-12-03 19:29:09,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 19:29:09,189 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 144 [2018-12-03 19:29:09,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:09,191 INFO L225 Difference]: With dead ends: 153 [2018-12-03 19:29:09,191 INFO L226 Difference]: Without dead ends: 151 [2018-12-03 19:29:09,192 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 431 GetRequests, 238 SyntacticMatches, 94 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4655 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3777, Invalid=6323, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 19:29:09,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-12-03 19:29:09,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 147. [2018-12-03 19:29:09,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-12-03 19:29:09,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2018-12-03 19:29:09,239 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 144 [2018-12-03 19:29:09,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:09,239 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2018-12-03 19:29:09,239 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 19:29:09,239 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2018-12-03 19:29:09,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-12-03 19:29:09,240 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:09,240 INFO L402 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1] [2018-12-03 19:29:09,240 INFO L423 AbstractCegarLoop]: === Iteration 95 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:09,240 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:09,240 INFO L82 PathProgramCache]: Analyzing trace with hash 1433169426, now seen corresponding path program 93 times [2018-12-03 19:29:09,240 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:09,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:09,241 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:29:09,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:09,241 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:09,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:12,116 INFO L134 CoverageAnalysis]: Checked inductivity of 3384 backedges. 2256 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:12,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:12,117 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:12,117 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:12,117 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:12,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:12,117 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 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:29:12,125 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:29:12,125 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:29:12,239 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:29:12,240 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:29:12,247 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:15,959 INFO L134 CoverageAnalysis]: Checked inductivity of 3384 backedges. 2256 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:15,960 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:18,846 INFO L134 CoverageAnalysis]: Checked inductivity of 3384 backedges. 2256 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:18,865 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:18,866 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 145 [2018-12-03 19:29:18,866 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:18,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2018-12-03 19:29:18,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2018-12-03 19:29:18,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4849, Invalid=16321, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 19:29:18,868 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand 146 states. [2018-12-03 19:29:21,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:21,437 INFO L93 Difference]: Finished difference Result 247 states and 249 transitions. [2018-12-03 19:29:21,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2018-12-03 19:29:21,437 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 146 [2018-12-03 19:29:21,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:21,438 INFO L225 Difference]: With dead ends: 247 [2018-12-03 19:29:21,438 INFO L226 Difference]: Without dead ends: 148 [2018-12-03 19:29:21,439 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 148 SyntacticMatches, 95 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13442 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=8473, Invalid=28969, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 19:29:21,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-12-03 19:29:21,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2018-12-03 19:29:21,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-12-03 19:29:21,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2018-12-03 19:29:21,485 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 146 [2018-12-03 19:29:21,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:21,486 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2018-12-03 19:29:21,486 INFO L481 AbstractCegarLoop]: Interpolant automaton has 146 states. [2018-12-03 19:29:21,486 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2018-12-03 19:29:21,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-12-03 19:29:21,486 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:21,486 INFO L402 BasicCegarLoop]: trace histogram [48, 48, 47, 1, 1, 1, 1] [2018-12-03 19:29:21,487 INFO L423 AbstractCegarLoop]: === Iteration 96 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:21,487 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:21,487 INFO L82 PathProgramCache]: Analyzing trace with hash -876151, now seen corresponding path program 94 times [2018-12-03 19:29:21,487 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:21,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:21,487 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:29:21,488 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:21,488 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:21,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:22,763 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1176 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:22,764 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:22,764 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:22,764 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:22,764 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:22,764 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:22,764 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 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:29:22,774 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:22,774 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:29:22,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:22,889 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:22,962 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1176 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:22,962 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:24,717 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1176 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:24,737 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:24,737 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51, 51] total 53 [2018-12-03 19:29:24,737 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:24,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-12-03 19:29:24,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-12-03 19:29:24,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1331, Invalid=1531, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 19:29:24,738 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand 54 states. [2018-12-03 19:29:25,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:25,988 INFO L93 Difference]: Finished difference Result 156 states and 157 transitions. [2018-12-03 19:29:25,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2018-12-03 19:29:25,989 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 147 [2018-12-03 19:29:25,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:25,990 INFO L225 Difference]: With dead ends: 156 [2018-12-03 19:29:25,990 INFO L226 Difference]: Without dead ends: 154 [2018-12-03 19:29:25,991 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 243 SyntacticMatches, 96 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4850 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=3929, Invalid=6577, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 19:29:25,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-12-03 19:29:26,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 150. [2018-12-03 19:29:26,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-12-03 19:29:26,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2018-12-03 19:29:26,039 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 147 [2018-12-03 19:29:26,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:26,040 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2018-12-03 19:29:26,040 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-12-03 19:29:26,040 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2018-12-03 19:29:26,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-12-03 19:29:26,040 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:26,040 INFO L402 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1] [2018-12-03 19:29:26,040 INFO L423 AbstractCegarLoop]: === Iteration 97 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:26,041 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:26,041 INFO L82 PathProgramCache]: Analyzing trace with hash -842047899, now seen corresponding path program 95 times [2018-12-03 19:29:26,041 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:26,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:26,042 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:26,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:26,042 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:26,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:29,289 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 2352 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:29,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:29,290 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:29,290 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:29,290 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:29,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:29,290 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:29:29,302 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:29:29,302 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:29:29,518 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2018-12-03 19:29:29,544 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:29:29,550 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:33,403 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 2352 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:33,403 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:36,144 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 2352 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:36,163 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:36,163 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 148 [2018-12-03 19:29:36,163 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:36,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 149 states [2018-12-03 19:29:36,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2018-12-03 19:29:36,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5048, Invalid=17004, Unknown=0, NotChecked=0, Total=22052 [2018-12-03 19:29:36,165 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand 149 states. [2018-12-03 19:29:40,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:40,273 INFO L93 Difference]: Finished difference Result 252 states and 254 transitions. [2018-12-03 19:29:40,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-12-03 19:29:40,273 INFO L78 Accepts]: Start accepts. Automaton has 149 states. Word has length 149 [2018-12-03 19:29:40,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:40,274 INFO L225 Difference]: With dead ends: 252 [2018-12-03 19:29:40,274 INFO L226 Difference]: Without dead ends: 151 [2018-12-03 19:29:40,276 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 151 SyntacticMatches, 97 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14016 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=8821, Invalid=30185, Unknown=0, NotChecked=0, Total=39006 [2018-12-03 19:29:40,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-12-03 19:29:40,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-12-03 19:29:40,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-12-03 19:29:40,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2018-12-03 19:29:40,336 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 149 [2018-12-03 19:29:40,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:40,336 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2018-12-03 19:29:40,336 INFO L481 AbstractCegarLoop]: Interpolant automaton has 149 states. [2018-12-03 19:29:40,336 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2018-12-03 19:29:40,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-12-03 19:29:40,337 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:40,337 INFO L402 BasicCegarLoop]: trace histogram [49, 49, 48, 1, 1, 1, 1] [2018-12-03 19:29:40,337 INFO L423 AbstractCegarLoop]: === Iteration 98 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:40,338 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:40,338 INFO L82 PathProgramCache]: Analyzing trace with hash -454138994, now seen corresponding path program 96 times [2018-12-03 19:29:40,338 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:40,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:40,339 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:29:40,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:40,339 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:40,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:41,464 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 1225 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:41,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:41,464 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:41,464 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:41,464 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:41,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:41,464 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 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:29:41,472 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:29:41,473 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:29:41,594 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:29:41,595 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:29:41,603 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:41,674 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 1225 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:41,674 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:43,908 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 1225 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:43,928 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:43,929 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52, 52] total 54 [2018-12-03 19:29:43,929 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:43,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 19:29:43,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 19:29:43,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1383, Invalid=1587, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 19:29:43,930 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand 55 states. [2018-12-03 19:29:45,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:45,214 INFO L93 Difference]: Finished difference Result 159 states and 160 transitions. [2018-12-03 19:29:45,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2018-12-03 19:29:45,215 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 150 [2018-12-03 19:29:45,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:45,216 INFO L225 Difference]: With dead ends: 159 [2018-12-03 19:29:45,216 INFO L226 Difference]: Without dead ends: 157 [2018-12-03 19:29:45,217 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 248 SyntacticMatches, 98 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5049 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=4084, Invalid=6836, Unknown=0, NotChecked=0, Total=10920 [2018-12-03 19:29:45,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-12-03 19:29:45,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 153. [2018-12-03 19:29:45,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-12-03 19:29:45,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 154 transitions. [2018-12-03 19:29:45,264 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 154 transitions. Word has length 150 [2018-12-03 19:29:45,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:45,264 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 154 transitions. [2018-12-03 19:29:45,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 19:29:45,264 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 154 transitions. [2018-12-03 19:29:45,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-12-03 19:29:45,264 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:45,264 INFO L402 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1] [2018-12-03 19:29:45,265 INFO L423 AbstractCegarLoop]: === Iteration 99 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:45,265 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:45,265 INFO L82 PathProgramCache]: Analyzing trace with hash 1659024170, now seen corresponding path program 97 times [2018-12-03 19:29:45,265 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:45,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:45,265 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:29:45,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:45,266 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:45,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:48,522 INFO L134 CoverageAnalysis]: Checked inductivity of 3675 backedges. 2450 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:48,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:48,522 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:48,522 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:48,522 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:48,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:48,522 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 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:29:48,530 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:48,531 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:29:48,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:48,648 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:52,406 INFO L134 CoverageAnalysis]: Checked inductivity of 3675 backedges. 2450 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:52,407 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:55,597 INFO L134 CoverageAnalysis]: Checked inductivity of 3675 backedges. 2450 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:55,616 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:55,616 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 151 [2018-12-03 19:29:55,616 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:55,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2018-12-03 19:29:55,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2018-12-03 19:29:55,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5251, Invalid=17701, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 19:29:55,619 INFO L87 Difference]: Start difference. First operand 153 states and 154 transitions. Second operand 152 states. [2018-12-03 19:29:59,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:59,749 INFO L93 Difference]: Finished difference Result 257 states and 259 transitions. [2018-12-03 19:29:59,749 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2018-12-03 19:29:59,749 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 152 [2018-12-03 19:29:59,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:59,750 INFO L225 Difference]: With dead ends: 257 [2018-12-03 19:29:59,750 INFO L226 Difference]: Without dead ends: 154 [2018-12-03 19:29:59,751 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 154 SyntacticMatches, 99 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14602 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=9176, Invalid=31426, Unknown=0, NotChecked=0, Total=40602 [2018-12-03 19:29:59,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-12-03 19:29:59,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 154. [2018-12-03 19:29:59,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-12-03 19:29:59,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2018-12-03 19:29:59,802 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 152 [2018-12-03 19:29:59,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:59,802 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2018-12-03 19:29:59,802 INFO L481 AbstractCegarLoop]: Interpolant automaton has 152 states. [2018-12-03 19:29:59,802 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2018-12-03 19:29:59,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-12-03 19:29:59,802 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:59,802 INFO L402 BasicCegarLoop]: trace histogram [50, 50, 49, 1, 1, 1, 1] [2018-12-03 19:29:59,803 INFO L423 AbstractCegarLoop]: === Iteration 100 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:59,803 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:59,803 INFO L82 PathProgramCache]: Analyzing trace with hash 96219489, now seen corresponding path program 98 times [2018-12-03 19:29:59,803 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:59,803 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:59,804 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:59,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:59,804 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:59,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:00,957 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1275 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:00,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:00,957 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:00,957 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:00,957 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:00,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:00,958 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 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:30:00,966 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:30:00,966 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:30:01,196 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-12-03 19:30:01,196 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:30:01,202 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:01,279 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1275 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:01,279 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:03,106 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1275 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:03,125 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:03,126 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 53] total 55 [2018-12-03 19:30:03,126 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:03,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-12-03 19:30:03,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-12-03 19:30:03,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1436, Invalid=1644, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 19:30:03,127 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand 56 states. [2018-12-03 19:30:04,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:04,730 INFO L93 Difference]: Finished difference Result 162 states and 163 transitions. [2018-12-03 19:30:04,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2018-12-03 19:30:04,730 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 153 [2018-12-03 19:30:04,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:04,732 INFO L225 Difference]: With dead ends: 162 [2018-12-03 19:30:04,732 INFO L226 Difference]: Without dead ends: 160 [2018-12-03 19:30:04,733 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 253 SyntacticMatches, 100 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5252 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=4242, Invalid=7100, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 19:30:04,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-03 19:30:04,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 156. [2018-12-03 19:30:04,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-12-03 19:30:04,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 157 transitions. [2018-12-03 19:30:04,784 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 157 transitions. Word has length 153 [2018-12-03 19:30:04,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:04,784 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 157 transitions. [2018-12-03 19:30:04,784 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-12-03 19:30:04,784 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 157 transitions. [2018-12-03 19:30:04,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-12-03 19:30:04,785 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:04,785 INFO L402 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1] [2018-12-03 19:30:04,785 INFO L423 AbstractCegarLoop]: === Iteration 101 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:04,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:04,785 INFO L82 PathProgramCache]: Analyzing trace with hash -2022418371, now seen corresponding path program 99 times [2018-12-03 19:30:04,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:04,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:04,786 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:30:04,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:04,786 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:04,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:08,026 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 2550 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:08,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:08,026 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:08,027 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:08,027 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:08,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:08,027 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 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:30:08,037 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:30:08,037 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:30:08,156 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:30:08,157 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:30:08,165 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:12,345 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 2550 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:12,345 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:15,623 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 2550 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:15,643 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:15,643 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 103, 103] total 154 [2018-12-03 19:30:15,644 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:15,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 155 states [2018-12-03 19:30:15,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2018-12-03 19:30:15,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5458, Invalid=18412, Unknown=0, NotChecked=0, Total=23870 [2018-12-03 19:30:15,646 INFO L87 Difference]: Start difference. First operand 156 states and 157 transitions. Second operand 155 states. [2018-12-03 19:30:19,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:19,909 INFO L93 Difference]: Finished difference Result 262 states and 264 transitions. [2018-12-03 19:30:19,909 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2018-12-03 19:30:19,909 INFO L78 Accepts]: Start accepts. Automaton has 155 states. Word has length 155 [2018-12-03 19:30:19,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:19,910 INFO L225 Difference]: With dead ends: 262 [2018-12-03 19:30:19,910 INFO L226 Difference]: Without dead ends: 157 [2018-12-03 19:30:19,912 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 157 SyntacticMatches, 101 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15200 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=9538, Invalid=32692, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 19:30:19,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-12-03 19:30:19,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2018-12-03 19:30:19,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-12-03 19:30:19,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2018-12-03 19:30:19,962 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 155 [2018-12-03 19:30:19,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:19,962 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2018-12-03 19:30:19,962 INFO L481 AbstractCegarLoop]: Interpolant automaton has 155 states. [2018-12-03 19:30:19,962 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2018-12-03 19:30:19,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-12-03 19:30:19,963 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:19,963 INFO L402 BasicCegarLoop]: trace histogram [51, 51, 50, 1, 1, 1, 1] [2018-12-03 19:30:19,963 INFO L423 AbstractCegarLoop]: === Iteration 102 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:19,963 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:19,963 INFO L82 PathProgramCache]: Analyzing trace with hash -2091181402, now seen corresponding path program 100 times [2018-12-03 19:30:19,964 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:19,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:19,964 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:30:19,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:19,964 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:20,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:21,192 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1326 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:21,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:21,192 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:21,192 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:21,192 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:21,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:21,192 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 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:30:21,200 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:30:21,200 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:30:21,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:21,325 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:21,395 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1326 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:21,395 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:23,301 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1326 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:23,320 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:23,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 56 [2018-12-03 19:30:23,320 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:23,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-12-03 19:30:23,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-12-03 19:30:23,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1490, Invalid=1702, Unknown=0, NotChecked=0, Total=3192 [2018-12-03 19:30:23,322 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand 57 states. [2018-12-03 19:30:24,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:24,908 INFO L93 Difference]: Finished difference Result 165 states and 166 transitions. [2018-12-03 19:30:24,909 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2018-12-03 19:30:24,909 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 156 [2018-12-03 19:30:24,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:24,910 INFO L225 Difference]: With dead ends: 165 [2018-12-03 19:30:24,910 INFO L226 Difference]: Without dead ends: 163 [2018-12-03 19:30:24,911 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 258 SyntacticMatches, 102 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5459 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=4403, Invalid=7369, Unknown=0, NotChecked=0, Total=11772 [2018-12-03 19:30:24,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-12-03 19:30:24,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 159. [2018-12-03 19:30:24,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-12-03 19:30:24,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2018-12-03 19:30:24,990 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 156 [2018-12-03 19:30:24,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:24,991 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2018-12-03 19:30:24,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-12-03 19:30:24,991 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2018-12-03 19:30:24,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-12-03 19:30:24,991 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:24,991 INFO L402 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1] [2018-12-03 19:30:24,992 INFO L423 AbstractCegarLoop]: === Iteration 103 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:24,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:24,992 INFO L82 PathProgramCache]: Analyzing trace with hash 419300418, now seen corresponding path program 101 times [2018-12-03 19:30:24,992 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:24,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:24,993 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:30:24,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:24,993 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:25,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:28,308 INFO L134 CoverageAnalysis]: Checked inductivity of 3978 backedges. 2652 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:28,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:28,308 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:28,308 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:28,308 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:28,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:28,308 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:30:28,319 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:30:28,319 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:30:28,565 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2018-12-03 19:30:28,565 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:30:28,571 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:32,896 INFO L134 CoverageAnalysis]: Checked inductivity of 3978 backedges. 2652 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:32,896 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:36,292 INFO L134 CoverageAnalysis]: Checked inductivity of 3978 backedges. 2652 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:36,311 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:36,311 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 105, 105] total 157 [2018-12-03 19:30:36,311 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:36,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2018-12-03 19:30:36,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2018-12-03 19:30:36,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5669, Invalid=19137, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 19:30:36,313 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand 158 states. [2018-12-03 19:30:40,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:40,928 INFO L93 Difference]: Finished difference Result 267 states and 269 transitions. [2018-12-03 19:30:40,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2018-12-03 19:30:40,928 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 158 [2018-12-03 19:30:40,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:40,929 INFO L225 Difference]: With dead ends: 267 [2018-12-03 19:30:40,929 INFO L226 Difference]: Without dead ends: 160 [2018-12-03 19:30:40,931 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 160 SyntacticMatches, 103 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15810 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=9907, Invalid=33983, Unknown=0, NotChecked=0, Total=43890 [2018-12-03 19:30:40,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-03 19:30:40,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-12-03 19:30:40,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-12-03 19:30:40,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2018-12-03 19:30:40,985 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 158 [2018-12-03 19:30:40,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:40,985 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2018-12-03 19:30:40,985 INFO L481 AbstractCegarLoop]: Interpolant automaton has 158 states. [2018-12-03 19:30:40,985 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2018-12-03 19:30:40,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-12-03 19:30:40,986 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:40,986 INFO L402 BasicCegarLoop]: trace histogram [52, 52, 51, 1, 1, 1, 1] [2018-12-03 19:30:40,986 INFO L423 AbstractCegarLoop]: === Iteration 104 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:40,986 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:40,987 INFO L82 PathProgramCache]: Analyzing trace with hash 599244089, now seen corresponding path program 102 times [2018-12-03 19:30:40,987 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:40,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:40,987 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:30:40,988 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:40,988 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:41,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:42,267 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1378 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:42,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:42,267 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:42,268 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:42,268 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:42,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:42,268 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 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:30:42,277 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:30:42,277 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:30:42,409 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:30:42,409 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:30:42,419 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:42,518 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1378 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:42,518 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:44,634 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1378 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:44,654 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:44,654 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55, 55] total 57 [2018-12-03 19:30:44,654 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:44,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-12-03 19:30:44,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-12-03 19:30:44,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1545, Invalid=1761, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 19:30:44,655 INFO L87 Difference]: Start difference. First operand 160 states and 161 transitions. Second operand 58 states. [2018-12-03 19:30:46,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:46,189 INFO L93 Difference]: Finished difference Result 168 states and 169 transitions. [2018-12-03 19:30:46,190 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2018-12-03 19:30:46,190 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 159 [2018-12-03 19:30:46,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:46,191 INFO L225 Difference]: With dead ends: 168 [2018-12-03 19:30:46,191 INFO L226 Difference]: Without dead ends: 166 [2018-12-03 19:30:46,192 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 263 SyntacticMatches, 104 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5670 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=4567, Invalid=7643, Unknown=0, NotChecked=0, Total=12210 [2018-12-03 19:30:46,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-03 19:30:46,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 162. [2018-12-03 19:30:46,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-12-03 19:30:46,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 163 transitions. [2018-12-03 19:30:46,256 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 163 transitions. Word has length 159 [2018-12-03 19:30:46,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:46,256 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 163 transitions. [2018-12-03 19:30:46,256 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-12-03 19:30:46,256 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 163 transitions. [2018-12-03 19:30:46,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-12-03 19:30:46,257 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:46,257 INFO L402 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1] [2018-12-03 19:30:46,257 INFO L423 AbstractCegarLoop]: === Iteration 105 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:46,258 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:46,258 INFO L82 PathProgramCache]: Analyzing trace with hash 347885077, now seen corresponding path program 103 times [2018-12-03 19:30:46,258 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:46,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:46,259 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:30:46,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:46,259 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:46,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:49,887 INFO L134 CoverageAnalysis]: Checked inductivity of 4134 backedges. 2756 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:49,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:49,887 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:49,887 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:49,887 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:49,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:49,887 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 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:30:49,895 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:30:49,895 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:30:50,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:50,020 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:54,287 INFO L134 CoverageAnalysis]: Checked inductivity of 4134 backedges. 2756 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:54,287 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:57,749 INFO L134 CoverageAnalysis]: Checked inductivity of 4134 backedges. 2756 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:57,768 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:57,768 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [107, 107, 107] total 160 [2018-12-03 19:30:57,768 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:57,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 161 states [2018-12-03 19:30:57,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2018-12-03 19:30:57,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5884, Invalid=19876, Unknown=0, NotChecked=0, Total=25760 [2018-12-03 19:30:57,770 INFO L87 Difference]: Start difference. First operand 162 states and 163 transitions. Second operand 161 states. [2018-12-03 19:31:02,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:02,522 INFO L93 Difference]: Finished difference Result 272 states and 274 transitions. [2018-12-03 19:31:02,522 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2018-12-03 19:31:02,523 INFO L78 Accepts]: Start accepts. Automaton has 161 states. Word has length 161 [2018-12-03 19:31:02,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:02,523 INFO L225 Difference]: With dead ends: 272 [2018-12-03 19:31:02,523 INFO L226 Difference]: Without dead ends: 163 [2018-12-03 19:31:02,525 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 163 SyntacticMatches, 105 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16432 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=10283, Invalid=35299, Unknown=0, NotChecked=0, Total=45582 [2018-12-03 19:31:02,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-12-03 19:31:02,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2018-12-03 19:31:02,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2018-12-03 19:31:02,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 164 transitions. [2018-12-03 19:31:02,581 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 164 transitions. Word has length 161 [2018-12-03 19:31:02,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:02,581 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 164 transitions. [2018-12-03 19:31:02,582 INFO L481 AbstractCegarLoop]: Interpolant automaton has 161 states. [2018-12-03 19:31:02,582 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 164 transitions. [2018-12-03 19:31:02,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2018-12-03 19:31:02,582 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:02,582 INFO L402 BasicCegarLoop]: trace histogram [53, 53, 52, 1, 1, 1, 1] [2018-12-03 19:31:02,583 INFO L423 AbstractCegarLoop]: === Iteration 106 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:02,583 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:02,583 INFO L82 PathProgramCache]: Analyzing trace with hash 930602430, now seen corresponding path program 104 times [2018-12-03 19:31:02,583 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:02,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:02,583 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:31:02,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:02,584 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:02,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:03,879 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1431 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:03,880 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:03,880 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:03,880 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:03,880 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:03,880 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:03,880 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 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:31:03,888 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:31:03,888 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:31:04,150 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2018-12-03 19:31:04,150 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:31:04,156 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:04,228 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1431 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:04,228 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:06,534 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1431 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:06,553 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:06,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56, 56] total 58 [2018-12-03 19:31:06,554 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:06,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 19:31:06,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 19:31:06,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1601, Invalid=1821, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 19:31:06,555 INFO L87 Difference]: Start difference. First operand 163 states and 164 transitions. Second operand 59 states. [2018-12-03 19:31:08,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:08,073 INFO L93 Difference]: Finished difference Result 171 states and 172 transitions. [2018-12-03 19:31:08,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-12-03 19:31:08,073 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 162 [2018-12-03 19:31:08,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:08,074 INFO L225 Difference]: With dead ends: 171 [2018-12-03 19:31:08,074 INFO L226 Difference]: Without dead ends: 169 [2018-12-03 19:31:08,076 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 268 SyntacticMatches, 106 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5885 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=4734, Invalid=7922, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 19:31:08,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-12-03 19:31:08,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 165. [2018-12-03 19:31:08,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-12-03 19:31:08,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 166 transitions. [2018-12-03 19:31:08,137 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 166 transitions. Word has length 162 [2018-12-03 19:31:08,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:08,137 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 166 transitions. [2018-12-03 19:31:08,137 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 19:31:08,137 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 166 transitions. [2018-12-03 19:31:08,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-12-03 19:31:08,138 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:08,138 INFO L402 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1] [2018-12-03 19:31:08,138 INFO L423 AbstractCegarLoop]: === Iteration 107 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:08,138 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:08,138 INFO L82 PathProgramCache]: Analyzing trace with hash 955670874, now seen corresponding path program 105 times [2018-12-03 19:31:08,138 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:08,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:08,139 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:31:08,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:08,139 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:08,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:11,963 INFO L134 CoverageAnalysis]: Checked inductivity of 4293 backedges. 2862 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:11,963 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:11,963 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:11,964 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:11,964 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:11,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:11,964 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:31:11,972 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:31:11,972 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:31:12,105 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:31:12,105 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:31:12,115 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:16,694 INFO L134 CoverageAnalysis]: Checked inductivity of 4293 backedges. 2862 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:16,694 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:20,001 INFO L134 CoverageAnalysis]: Checked inductivity of 4293 backedges. 2862 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:20,021 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:20,021 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [109, 109, 109] total 163 [2018-12-03 19:31:20,021 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:20,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 164 states [2018-12-03 19:31:20,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2018-12-03 19:31:20,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6103, Invalid=20629, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 19:31:20,023 INFO L87 Difference]: Start difference. First operand 165 states and 166 transitions. Second operand 164 states. [2018-12-03 19:31:23,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:23,329 INFO L93 Difference]: Finished difference Result 277 states and 279 transitions. [2018-12-03 19:31:23,329 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2018-12-03 19:31:23,329 INFO L78 Accepts]: Start accepts. Automaton has 164 states. Word has length 164 [2018-12-03 19:31:23,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:23,330 INFO L225 Difference]: With dead ends: 277 [2018-12-03 19:31:23,330 INFO L226 Difference]: Without dead ends: 166 [2018-12-03 19:31:23,332 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 166 SyntacticMatches, 107 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17066 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=10666, Invalid=36640, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 19:31:23,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-03 19:31:23,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2018-12-03 19:31:23,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-12-03 19:31:23,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2018-12-03 19:31:23,398 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 164 [2018-12-03 19:31:23,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:23,398 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2018-12-03 19:31:23,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has 164 states. [2018-12-03 19:31:23,399 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2018-12-03 19:31:23,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-12-03 19:31:23,399 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:23,399 INFO L402 BasicCegarLoop]: trace histogram [54, 54, 53, 1, 1, 1, 1] [2018-12-03 19:31:23,399 INFO L423 AbstractCegarLoop]: === Iteration 108 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:23,400 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:23,400 INFO L82 PathProgramCache]: Analyzing trace with hash 430523665, now seen corresponding path program 106 times [2018-12-03 19:31:23,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:23,400 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:23,401 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:31:23,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:23,401 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:23,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:24,722 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1485 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:24,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:24,722 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:24,722 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:24,722 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:24,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:24,722 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 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:31:24,730 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:31:24,730 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:31:24,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:24,862 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:24,936 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1485 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:24,937 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:27,344 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1485 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:27,364 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:27,364 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57, 57] total 59 [2018-12-03 19:31:27,365 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:27,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-12-03 19:31:27,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-12-03 19:31:27,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1658, Invalid=1882, Unknown=0, NotChecked=0, Total=3540 [2018-12-03 19:31:27,365 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand 60 states. [2018-12-03 19:31:28,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:28,856 INFO L93 Difference]: Finished difference Result 174 states and 175 transitions. [2018-12-03 19:31:28,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2018-12-03 19:31:28,856 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 165 [2018-12-03 19:31:28,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:28,857 INFO L225 Difference]: With dead ends: 174 [2018-12-03 19:31:28,857 INFO L226 Difference]: Without dead ends: 172 [2018-12-03 19:31:28,858 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 273 SyntacticMatches, 108 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6104 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=4904, Invalid=8206, Unknown=0, NotChecked=0, Total=13110 [2018-12-03 19:31:28,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-12-03 19:31:28,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 168. [2018-12-03 19:31:28,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-12-03 19:31:28,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 169 transitions. [2018-12-03 19:31:28,941 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 169 transitions. Word has length 165 [2018-12-03 19:31:28,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:28,941 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 169 transitions. [2018-12-03 19:31:28,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-12-03 19:31:28,941 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 169 transitions. [2018-12-03 19:31:28,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-12-03 19:31:28,942 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:28,942 INFO L402 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1] [2018-12-03 19:31:28,942 INFO L423 AbstractCegarLoop]: === Iteration 109 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:28,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:28,942 INFO L82 PathProgramCache]: Analyzing trace with hash 1416314861, now seen corresponding path program 107 times [2018-12-03 19:31:28,942 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:28,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:28,943 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:31:28,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:28,943 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:28,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:32,998 INFO L134 CoverageAnalysis]: Checked inductivity of 4455 backedges. 2970 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:32,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:32,999 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:32,999 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:32,999 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:32,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:32,999 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 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:31:33,007 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:31:33,007 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:31:33,275 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2018-12-03 19:31:33,275 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:31:33,282 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:38,002 INFO L134 CoverageAnalysis]: Checked inductivity of 4455 backedges. 2970 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:38,003 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:41,755 INFO L134 CoverageAnalysis]: Checked inductivity of 4455 backedges. 2970 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:41,774 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:41,774 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 111, 111] total 166 [2018-12-03 19:31:41,775 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:41,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 167 states [2018-12-03 19:31:41,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 167 interpolants. [2018-12-03 19:31:41,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6326, Invalid=21396, Unknown=0, NotChecked=0, Total=27722 [2018-12-03 19:31:41,776 INFO L87 Difference]: Start difference. First operand 168 states and 169 transitions. Second operand 167 states. [2018-12-03 19:31:46,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:46,755 INFO L93 Difference]: Finished difference Result 282 states and 284 transitions. [2018-12-03 19:31:46,755 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2018-12-03 19:31:46,755 INFO L78 Accepts]: Start accepts. Automaton has 167 states. Word has length 167 [2018-12-03 19:31:46,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:46,756 INFO L225 Difference]: With dead ends: 282 [2018-12-03 19:31:46,756 INFO L226 Difference]: Without dead ends: 169 [2018-12-03 19:31:46,759 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 169 SyntacticMatches, 109 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17712 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=11056, Invalid=38006, Unknown=0, NotChecked=0, Total=49062 [2018-12-03 19:31:46,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-12-03 19:31:46,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-12-03 19:31:46,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-12-03 19:31:46,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-12-03 19:31:46,826 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 167 [2018-12-03 19:31:46,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:46,827 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-12-03 19:31:46,827 INFO L481 AbstractCegarLoop]: Interpolant automaton has 167 states. [2018-12-03 19:31:46,827 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-12-03 19:31:46,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-12-03 19:31:46,828 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:46,828 INFO L402 BasicCegarLoop]: trace histogram [55, 55, 54, 1, 1, 1, 1] [2018-12-03 19:31:46,828 INFO L423 AbstractCegarLoop]: === Iteration 110 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:46,828 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:46,828 INFO L82 PathProgramCache]: Analyzing trace with hash -973296426, now seen corresponding path program 108 times [2018-12-03 19:31:46,828 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:46,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:46,829 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:31:46,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:46,829 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:46,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:48,281 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1540 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:48,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:48,282 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:48,282 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:48,282 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:48,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:48,282 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 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:31:48,290 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:31:48,290 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:31:48,429 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:31:48,429 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:31:48,438 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:48,517 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1540 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:48,517 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:50,716 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1540 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:50,735 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:50,735 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 60 [2018-12-03 19:31:50,735 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:50,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-12-03 19:31:50,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-12-03 19:31:50,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1716, Invalid=1944, Unknown=0, NotChecked=0, Total=3660 [2018-12-03 19:31:50,736 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 61 states. [2018-12-03 19:31:52,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:52,582 INFO L93 Difference]: Finished difference Result 177 states and 178 transitions. [2018-12-03 19:31:52,582 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2018-12-03 19:31:52,582 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 168 [2018-12-03 19:31:52,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:52,583 INFO L225 Difference]: With dead ends: 177 [2018-12-03 19:31:52,583 INFO L226 Difference]: Without dead ends: 175 [2018-12-03 19:31:52,584 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 278 SyntacticMatches, 110 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6327 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=5077, Invalid=8495, Unknown=0, NotChecked=0, Total=13572 [2018-12-03 19:31:52,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-12-03 19:31:52,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 171. [2018-12-03 19:31:52,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-12-03 19:31:52,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 172 transitions. [2018-12-03 19:31:52,649 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 172 transitions. Word has length 168 [2018-12-03 19:31:52,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:52,649 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 172 transitions. [2018-12-03 19:31:52,649 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-12-03 19:31:52,649 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 172 transitions. [2018-12-03 19:31:52,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-12-03 19:31:52,650 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:52,650 INFO L402 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1] [2018-12-03 19:31:52,650 INFO L423 AbstractCegarLoop]: === Iteration 111 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:52,650 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:52,650 INFO L82 PathProgramCache]: Analyzing trace with hash 964938354, now seen corresponding path program 109 times [2018-12-03 19:31:52,651 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:52,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:52,651 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:31:52,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:52,651 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:52,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:56,698 INFO L134 CoverageAnalysis]: Checked inductivity of 4620 backedges. 3080 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:56,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:56,698 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:56,698 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:56,698 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:56,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:56,698 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 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:31:56,706 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:31:56,706 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:31:56,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:56,838 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:32:01,866 INFO L134 CoverageAnalysis]: Checked inductivity of 4620 backedges. 3080 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:01,866 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:32:05,460 INFO L134 CoverageAnalysis]: Checked inductivity of 4620 backedges. 3080 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:05,479 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:32:05,480 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [113, 113, 113] total 169 [2018-12-03 19:32:05,480 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:32:05,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 170 states [2018-12-03 19:32:05,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2018-12-03 19:32:05,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6553, Invalid=22177, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 19:32:05,481 INFO L87 Difference]: Start difference. First operand 171 states and 172 transitions. Second operand 170 states. [2018-12-03 19:32:10,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:32:10,561 INFO L93 Difference]: Finished difference Result 287 states and 289 transitions. [2018-12-03 19:32:10,561 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2018-12-03 19:32:10,561 INFO L78 Accepts]: Start accepts. Automaton has 170 states. Word has length 170 [2018-12-03 19:32:10,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:32:10,561 INFO L225 Difference]: With dead ends: 287 [2018-12-03 19:32:10,561 INFO L226 Difference]: Without dead ends: 172 [2018-12-03 19:32:10,563 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 172 SyntacticMatches, 111 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18370 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=11453, Invalid=39397, Unknown=0, NotChecked=0, Total=50850 [2018-12-03 19:32:10,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-12-03 19:32:10,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2018-12-03 19:32:10,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-12-03 19:32:10,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2018-12-03 19:32:10,626 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 170 [2018-12-03 19:32:10,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:32:10,626 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2018-12-03 19:32:10,626 INFO L481 AbstractCegarLoop]: Interpolant automaton has 170 states. [2018-12-03 19:32:10,627 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2018-12-03 19:32:10,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-12-03 19:32:10,627 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:32:10,627 INFO L402 BasicCegarLoop]: trace histogram [56, 56, 55, 1, 1, 1, 1] [2018-12-03 19:32:10,627 INFO L423 AbstractCegarLoop]: === Iteration 112 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:32:10,627 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:32:10,628 INFO L82 PathProgramCache]: Analyzing trace with hash 1138018537, now seen corresponding path program 110 times [2018-12-03 19:32:10,628 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:32:10,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:10,628 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:32:10,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:10,628 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:32:10,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:12,330 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1596 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:12,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:12,331 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:32:12,331 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:32:12,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:32:12,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:12,331 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 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:32:12,340 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:32:12,340 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:32:12,625 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 56 check-sat command(s) [2018-12-03 19:32:12,625 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:32:12,631 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:32:12,693 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1596 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:12,693 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:32:14,960 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1596 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:14,979 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:32:14,980 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 59, 59] total 61 [2018-12-03 19:32:14,980 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:32:14,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-12-03 19:32:14,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-12-03 19:32:14,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1775, Invalid=2007, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 19:32:14,981 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand 62 states. [2018-12-03 19:32:16,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:32:16,607 INFO L93 Difference]: Finished difference Result 180 states and 181 transitions. [2018-12-03 19:32:16,607 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2018-12-03 19:32:16,607 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 171 [2018-12-03 19:32:16,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:32:16,608 INFO L225 Difference]: With dead ends: 180 [2018-12-03 19:32:16,608 INFO L226 Difference]: Without dead ends: 178 [2018-12-03 19:32:16,609 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 283 SyntacticMatches, 112 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6554 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=5253, Invalid=8789, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 19:32:16,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-12-03 19:32:16,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 174. [2018-12-03 19:32:16,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-12-03 19:32:16,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 175 transitions. [2018-12-03 19:32:16,678 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 175 transitions. Word has length 171 [2018-12-03 19:32:16,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:32:16,678 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 175 transitions. [2018-12-03 19:32:16,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-12-03 19:32:16,678 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 175 transitions. [2018-12-03 19:32:16,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-12-03 19:32:16,679 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:32:16,679 INFO L402 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1] [2018-12-03 19:32:16,679 INFO L423 AbstractCegarLoop]: === Iteration 113 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:32:16,679 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:32:16,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1580913211, now seen corresponding path program 111 times [2018-12-03 19:32:16,679 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:32:16,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:16,680 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:32:16,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:16,680 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:32:16,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:20,772 INFO L134 CoverageAnalysis]: Checked inductivity of 4788 backedges. 3192 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:20,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:20,773 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:32:20,773 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:32:20,773 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:32:20,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:20,773 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:32:20,782 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:32:20,782 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:32:20,922 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:32:20,922 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:32:20,931 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:32:26,042 INFO L134 CoverageAnalysis]: Checked inductivity of 4788 backedges. 3192 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:26,043 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:32:30,086 INFO L134 CoverageAnalysis]: Checked inductivity of 4788 backedges. 3192 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:30,105 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:32:30,106 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 115, 115] total 172 [2018-12-03 19:32:30,106 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:32:30,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 173 states [2018-12-03 19:32:30,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 173 interpolants. [2018-12-03 19:32:30,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6784, Invalid=22972, Unknown=0, NotChecked=0, Total=29756 [2018-12-03 19:32:30,107 INFO L87 Difference]: Start difference. First operand 174 states and 175 transitions. Second operand 173 states. [2018-12-03 19:32:35,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:32:35,338 INFO L93 Difference]: Finished difference Result 292 states and 294 transitions. [2018-12-03 19:32:35,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2018-12-03 19:32:35,338 INFO L78 Accepts]: Start accepts. Automaton has 173 states. Word has length 173 [2018-12-03 19:32:35,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:32:35,338 INFO L225 Difference]: With dead ends: 292 [2018-12-03 19:32:35,338 INFO L226 Difference]: Without dead ends: 175 [2018-12-03 19:32:35,340 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 175 SyntacticMatches, 113 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19040 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=11857, Invalid=40813, Unknown=0, NotChecked=0, Total=52670 [2018-12-03 19:32:35,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-12-03 19:32:35,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2018-12-03 19:32:35,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-12-03 19:32:35,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 176 transitions. [2018-12-03 19:32:35,403 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 176 transitions. Word has length 173 [2018-12-03 19:32:35,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:32:35,403 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 176 transitions. [2018-12-03 19:32:35,403 INFO L481 AbstractCegarLoop]: Interpolant automaton has 173 states. [2018-12-03 19:32:35,403 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 176 transitions. [2018-12-03 19:32:35,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-12-03 19:32:35,404 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:32:35,404 INFO L402 BasicCegarLoop]: trace histogram [57, 57, 56, 1, 1, 1, 1] [2018-12-03 19:32:35,404 INFO L423 AbstractCegarLoop]: === Iteration 114 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:32:35,405 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:32:35,405 INFO L82 PathProgramCache]: Analyzing trace with hash 690063342, now seen corresponding path program 112 times [2018-12-03 19:32:35,405 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:32:35,405 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:35,405 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:32:35,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:35,406 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:32:35,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:36,885 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1653 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:36,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:36,885 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:32:36,885 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:32:36,885 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:32:36,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:36,885 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 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:32:36,893 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:32:36,894 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:32:37,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:37,032 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:32:37,121 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1653 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:37,121 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:32:39,845 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1653 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:39,866 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:32:39,866 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60, 60] total 62 [2018-12-03 19:32:39,866 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:32:39,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 19:32:39,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 19:32:39,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1835, Invalid=2071, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 19:32:39,867 INFO L87 Difference]: Start difference. First operand 175 states and 176 transitions. Second operand 63 states. [2018-12-03 19:32:41,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:32:41,537 INFO L93 Difference]: Finished difference Result 183 states and 184 transitions. [2018-12-03 19:32:41,537 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2018-12-03 19:32:41,537 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 174 [2018-12-03 19:32:41,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:32:41,538 INFO L225 Difference]: With dead ends: 183 [2018-12-03 19:32:41,538 INFO L226 Difference]: Without dead ends: 181 [2018-12-03 19:32:41,538 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 521 GetRequests, 288 SyntacticMatches, 114 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6785 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=5432, Invalid=9088, Unknown=0, NotChecked=0, Total=14520 [2018-12-03 19:32:41,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-12-03 19:32:41,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 177. [2018-12-03 19:32:41,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-12-03 19:32:41,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 178 transitions. [2018-12-03 19:32:41,602 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 178 transitions. Word has length 174 [2018-12-03 19:32:41,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:32:41,602 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 178 transitions. [2018-12-03 19:32:41,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 19:32:41,602 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 178 transitions. [2018-12-03 19:32:41,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-12-03 19:32:41,603 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:32:41,603 INFO L402 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1] [2018-12-03 19:32:41,603 INFO L423 AbstractCegarLoop]: === Iteration 115 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:32:41,603 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:32:41,603 INFO L82 PathProgramCache]: Analyzing trace with hash 1725841290, now seen corresponding path program 113 times [2018-12-03 19:32:41,603 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:32:41,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:41,604 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:32:41,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:41,604 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:32:41,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:46,034 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 3306 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:46,034 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:46,034 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:32:46,034 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:32:46,034 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:32:46,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:46,035 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:32:46,042 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:32:46,043 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:32:46,336 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2018-12-03 19:32:46,336 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:32:46,343 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:32:51,563 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 3306 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:51,563 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:32:55,627 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 3306 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:55,646 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:32:55,647 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 175 [2018-12-03 19:32:55,647 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:32:55,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 176 states [2018-12-03 19:32:55,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2018-12-03 19:32:55,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7019, Invalid=23781, Unknown=0, NotChecked=0, Total=30800 [2018-12-03 19:32:55,649 INFO L87 Difference]: Start difference. First operand 177 states and 178 transitions. Second operand 176 states. [2018-12-03 19:33:01,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:33:01,272 INFO L93 Difference]: Finished difference Result 297 states and 299 transitions. [2018-12-03 19:33:01,272 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2018-12-03 19:33:01,273 INFO L78 Accepts]: Start accepts. Automaton has 176 states. Word has length 176 [2018-12-03 19:33:01,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:33:01,273 INFO L225 Difference]: With dead ends: 297 [2018-12-03 19:33:01,273 INFO L226 Difference]: Without dead ends: 178 [2018-12-03 19:33:01,275 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 525 GetRequests, 178 SyntacticMatches, 115 SemanticMatches, 232 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19722 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=12268, Invalid=42254, Unknown=0, NotChecked=0, Total=54522 [2018-12-03 19:33:01,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-12-03 19:33:01,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-12-03 19:33:01,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-12-03 19:33:01,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 179 transitions. [2018-12-03 19:33:01,351 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 179 transitions. Word has length 176 [2018-12-03 19:33:01,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:33:01,351 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 179 transitions. [2018-12-03 19:33:01,351 INFO L481 AbstractCegarLoop]: Interpolant automaton has 176 states. [2018-12-03 19:33:01,351 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 179 transitions. [2018-12-03 19:33:01,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-12-03 19:33:01,351 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:33:01,352 INFO L402 BasicCegarLoop]: trace histogram [58, 58, 57, 1, 1, 1, 1] [2018-12-03 19:33:01,352 INFO L423 AbstractCegarLoop]: === Iteration 116 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:33:01,352 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:33:01,352 INFO L82 PathProgramCache]: Analyzing trace with hash 2063485121, now seen corresponding path program 114 times [2018-12-03 19:33:01,352 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:33:01,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:01,353 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:33:01,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:01,353 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:33:01,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:03,181 INFO L134 CoverageAnalysis]: Checked inductivity of 5017 backedges. 1711 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:03,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:03,181 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:33:03,181 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:33:03,181 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:33:03,182 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:03,182 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 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:33:03,190 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:33:03,190 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:33:03,335 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:33:03,335 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:33:03,346 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:33:03,454 INFO L134 CoverageAnalysis]: Checked inductivity of 5017 backedges. 1711 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:03,454 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:33:05,872 INFO L134 CoverageAnalysis]: Checked inductivity of 5017 backedges. 1711 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:05,892 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:33:05,892 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 61, 61] total 63 [2018-12-03 19:33:05,892 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:33:05,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-12-03 19:33:05,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-12-03 19:33:05,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1896, Invalid=2136, Unknown=0, NotChecked=0, Total=4032 [2018-12-03 19:33:05,893 INFO L87 Difference]: Start difference. First operand 178 states and 179 transitions. Second operand 64 states. [2018-12-03 19:33:07,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:33:07,614 INFO L93 Difference]: Finished difference Result 186 states and 187 transitions. [2018-12-03 19:33:07,615 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-12-03 19:33:07,615 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 177 [2018-12-03 19:33:07,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:33:07,616 INFO L225 Difference]: With dead ends: 186 [2018-12-03 19:33:07,616 INFO L226 Difference]: Without dead ends: 184 [2018-12-03 19:33:07,617 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 293 SyntacticMatches, 116 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7020 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=5614, Invalid=9392, Unknown=0, NotChecked=0, Total=15006 [2018-12-03 19:33:07,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-12-03 19:33:07,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 180. [2018-12-03 19:33:07,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-12-03 19:33:07,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 181 transitions. [2018-12-03 19:33:07,688 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 181 transitions. Word has length 177 [2018-12-03 19:33:07,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:33:07,688 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 181 transitions. [2018-12-03 19:33:07,688 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-12-03 19:33:07,688 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 181 transitions. [2018-12-03 19:33:07,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-12-03 19:33:07,689 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:33:07,689 INFO L402 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1] [2018-12-03 19:33:07,689 INFO L423 AbstractCegarLoop]: === Iteration 117 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:33:07,689 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:33:07,689 INFO L82 PathProgramCache]: Analyzing trace with hash -1265756259, now seen corresponding path program 115 times [2018-12-03 19:33:07,690 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:33:07,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:07,690 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:33:07,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:07,690 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:33:07,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:12,196 INFO L134 CoverageAnalysis]: Checked inductivity of 5133 backedges. 3422 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:12,196 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:12,196 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:33:12,196 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:33:12,197 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:33:12,197 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:12,197 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 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:33:12,207 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:33:12,207 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:33:12,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:12,347 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:33:17,788 INFO L134 CoverageAnalysis]: Checked inductivity of 5133 backedges. 3422 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:17,788 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:33:21,983 INFO L134 CoverageAnalysis]: Checked inductivity of 5133 backedges. 3422 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:22,004 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:33:22,004 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [119, 119, 119] total 178 [2018-12-03 19:33:22,004 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:33:22,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 179 states [2018-12-03 19:33:22,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 179 interpolants. [2018-12-03 19:33:22,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7258, Invalid=24604, Unknown=0, NotChecked=0, Total=31862 [2018-12-03 19:33:22,006 INFO L87 Difference]: Start difference. First operand 180 states and 181 transitions. Second operand 179 states. [2018-12-03 19:33:27,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:33:27,678 INFO L93 Difference]: Finished difference Result 302 states and 304 transitions. [2018-12-03 19:33:27,678 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2018-12-03 19:33:27,678 INFO L78 Accepts]: Start accepts. Automaton has 179 states. Word has length 179 [2018-12-03 19:33:27,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:33:27,678 INFO L225 Difference]: With dead ends: 302 [2018-12-03 19:33:27,678 INFO L226 Difference]: Without dead ends: 181 [2018-12-03 19:33:27,680 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 534 GetRequests, 181 SyntacticMatches, 117 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20416 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=12686, Invalid=43720, Unknown=0, NotChecked=0, Total=56406 [2018-12-03 19:33:27,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-12-03 19:33:27,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 181. [2018-12-03 19:33:27,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-12-03 19:33:27,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 182 transitions. [2018-12-03 19:33:27,771 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 182 transitions. Word has length 179 [2018-12-03 19:33:27,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:33:27,771 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 182 transitions. [2018-12-03 19:33:27,771 INFO L481 AbstractCegarLoop]: Interpolant automaton has 179 states. [2018-12-03 19:33:27,771 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 182 transitions. [2018-12-03 19:33:27,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2018-12-03 19:33:27,772 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:33:27,772 INFO L402 BasicCegarLoop]: trace histogram [59, 59, 58, 1, 1, 1, 1] [2018-12-03 19:33:27,772 INFO L423 AbstractCegarLoop]: === Iteration 118 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:33:27,772 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:33:27,772 INFO L82 PathProgramCache]: Analyzing trace with hash -1331794170, now seen corresponding path program 116 times [2018-12-03 19:33:27,773 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:33:27,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:27,773 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:33:27,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:27,773 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:33:27,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:29,598 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1770 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:29,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:29,598 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:33:29,598 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:33:29,599 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:33:29,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:29,599 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:33:29,607 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:33:29,607 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:33:29,913 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2018-12-03 19:33:29,913 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:33:29,919 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:33:30,029 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1770 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:30,029 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:33:32,601 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1770 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:32,620 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:33:32,621 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 64 [2018-12-03 19:33:32,621 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:33:32,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 19:33:32,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 19:33:32,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1958, Invalid=2202, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 19:33:32,622 INFO L87 Difference]: Start difference. First operand 181 states and 182 transitions. Second operand 65 states. [2018-12-03 19:33:34,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:33:34,522 INFO L93 Difference]: Finished difference Result 189 states and 190 transitions. [2018-12-03 19:33:34,522 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2018-12-03 19:33:34,522 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 180 [2018-12-03 19:33:34,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:33:34,523 INFO L225 Difference]: With dead ends: 189 [2018-12-03 19:33:34,523 INFO L226 Difference]: Without dead ends: 187 [2018-12-03 19:33:34,525 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 539 GetRequests, 298 SyntacticMatches, 118 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7259 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=5799, Invalid=9701, Unknown=0, NotChecked=0, Total=15500 [2018-12-03 19:33:34,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-12-03 19:33:34,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 183. [2018-12-03 19:33:34,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-12-03 19:33:34,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 184 transitions. [2018-12-03 19:33:34,592 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 184 transitions. Word has length 180 [2018-12-03 19:33:34,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:33:34,593 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 184 transitions. [2018-12-03 19:33:34,593 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 19:33:34,593 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 184 transitions. [2018-12-03 19:33:34,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-12-03 19:33:34,593 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:33:34,593 INFO L402 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1] [2018-12-03 19:33:34,593 INFO L423 AbstractCegarLoop]: === Iteration 119 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:33:34,593 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:33:34,594 INFO L82 PathProgramCache]: Analyzing trace with hash 45990050, now seen corresponding path program 117 times [2018-12-03 19:33:34,594 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:33:34,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:34,594 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:33:34,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:34,594 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:33:34,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:39,374 INFO L134 CoverageAnalysis]: Checked inductivity of 5310 backedges. 3540 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:39,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:39,375 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:33:39,375 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:33:39,375 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:33:39,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:39,375 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 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:33:39,384 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:33:39,384 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:33:39,535 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:33:39,535 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:33:39,547 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:33:45,188 INFO L134 CoverageAnalysis]: Checked inductivity of 5310 backedges. 3540 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:45,188 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:33:49,611 INFO L134 CoverageAnalysis]: Checked inductivity of 5310 backedges. 3540 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:49,630 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:33:49,631 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [121, 121, 121] total 181 [2018-12-03 19:33:49,631 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:33:49,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 182 states [2018-12-03 19:33:49,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 182 interpolants. [2018-12-03 19:33:49,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7501, Invalid=25441, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 19:33:49,633 INFO L87 Difference]: Start difference. First operand 183 states and 184 transitions. Second operand 182 states. [2018-12-03 19:33:54,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:33:54,941 INFO L93 Difference]: Finished difference Result 307 states and 309 transitions. [2018-12-03 19:33:54,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2018-12-03 19:33:54,941 INFO L78 Accepts]: Start accepts. Automaton has 182 states. Word has length 182 [2018-12-03 19:33:54,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:33:54,942 INFO L225 Difference]: With dead ends: 307 [2018-12-03 19:33:54,942 INFO L226 Difference]: Without dead ends: 184 [2018-12-03 19:33:54,943 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 543 GetRequests, 184 SyntacticMatches, 119 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21122 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=13111, Invalid=45211, Unknown=0, NotChecked=0, Total=58322 [2018-12-03 19:33:54,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-12-03 19:33:55,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 184. [2018-12-03 19:33:55,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-12-03 19:33:55,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 185 transitions. [2018-12-03 19:33:55,016 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 185 transitions. Word has length 182 [2018-12-03 19:33:55,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:33:55,016 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 185 transitions. [2018-12-03 19:33:55,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has 182 states. [2018-12-03 19:33:55,016 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 185 transitions. [2018-12-03 19:33:55,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-12-03 19:33:55,016 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:33:55,016 INFO L402 BasicCegarLoop]: trace histogram [60, 60, 59, 1, 1, 1, 1] [2018-12-03 19:33:55,017 INFO L423 AbstractCegarLoop]: === Iteration 120 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:33:55,017 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:33:55,017 INFO L82 PathProgramCache]: Analyzing trace with hash -194394983, now seen corresponding path program 118 times [2018-12-03 19:33:55,017 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:33:55,017 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:55,017 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:33:55,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:55,018 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:33:55,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:56,604 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1830 proven. 3540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:56,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:56,605 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:33:56,605 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:33:56,605 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:33:56,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:56,605 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 119 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 119 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:33:56,614 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:33:56,614 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:33:56,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:56,756 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:33:56,838 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1830 proven. 3540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:56,838 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:33:59,704 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1830 proven. 3540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:59,723 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:33:59,723 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 63, 63] total 65 [2018-12-03 19:33:59,723 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:33:59,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-12-03 19:33:59,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-12-03 19:33:59,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2021, Invalid=2269, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 19:33:59,724 INFO L87 Difference]: Start difference. First operand 184 states and 185 transitions. Second operand 66 states. [2018-12-03 19:34:01,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:34:01,556 INFO L93 Difference]: Finished difference Result 192 states and 193 transitions. [2018-12-03 19:34:01,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2018-12-03 19:34:01,562 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 183 [2018-12-03 19:34:01,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:34:01,562 INFO L225 Difference]: With dead ends: 192 [2018-12-03 19:34:01,562 INFO L226 Difference]: Without dead ends: 190 [2018-12-03 19:34:01,563 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 303 SyntacticMatches, 120 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7502 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=5987, Invalid=10015, Unknown=0, NotChecked=0, Total=16002 [2018-12-03 19:34:01,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-12-03 19:34:01,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 186. [2018-12-03 19:34:01,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-12-03 19:34:01,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 187 transitions. [2018-12-03 19:34:01,636 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 187 transitions. Word has length 183 [2018-12-03 19:34:01,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:34:01,637 INFO L480 AbstractCegarLoop]: Abstraction has 186 states and 187 transitions. [2018-12-03 19:34:01,637 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-12-03 19:34:01,637 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 187 transitions. [2018-12-03 19:34:01,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-12-03 19:34:01,637 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:34:01,637 INFO L402 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1, 1, 1] [2018-12-03 19:34:01,638 INFO L423 AbstractCegarLoop]: === Iteration 121 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:34:01,638 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:34:01,638 INFO L82 PathProgramCache]: Analyzing trace with hash -2130051723, now seen corresponding path program 119 times [2018-12-03 19:34:01,638 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:34:01,638 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:01,638 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:34:01,638 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:01,639 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:34:01,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:34:06,365 INFO L134 CoverageAnalysis]: Checked inductivity of 5490 backedges. 3660 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:06,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:06,366 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:34:06,366 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:34:06,366 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:34:06,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:06,366 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:34:06,374 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:34:06,374 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:34:06,704 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 61 check-sat command(s) [2018-12-03 19:34:06,704 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:34:06,711 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:34:12,333 INFO L134 CoverageAnalysis]: Checked inductivity of 5490 backedges. 3660 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:12,333 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:34:16,871 INFO L134 CoverageAnalysis]: Checked inductivity of 5490 backedges. 3660 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:16,890 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:34:16,891 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [123, 123, 123] total 184 [2018-12-03 19:34:16,891 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:34:16,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 185 states [2018-12-03 19:34:16,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 185 interpolants. [2018-12-03 19:34:16,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7748, Invalid=26292, Unknown=0, NotChecked=0, Total=34040 [2018-12-03 19:34:16,893 INFO L87 Difference]: Start difference. First operand 186 states and 187 transitions. Second operand 185 states. [2018-12-03 19:34:23,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:34:23,069 INFO L93 Difference]: Finished difference Result 312 states and 314 transitions. [2018-12-03 19:34:23,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2018-12-03 19:34:23,069 INFO L78 Accepts]: Start accepts. Automaton has 185 states. Word has length 185 [2018-12-03 19:34:23,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:34:23,070 INFO L225 Difference]: With dead ends: 312 [2018-12-03 19:34:23,070 INFO L226 Difference]: Without dead ends: 187 [2018-12-03 19:34:23,072 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 187 SyntacticMatches, 121 SemanticMatches, 244 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21840 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=13543, Invalid=46727, Unknown=0, NotChecked=0, Total=60270 [2018-12-03 19:34:23,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-12-03 19:34:23,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-12-03 19:34:23,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-12-03 19:34:23,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-12-03 19:34:23,147 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 185 [2018-12-03 19:34:23,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:34:23,148 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-12-03 19:34:23,148 INFO L481 AbstractCegarLoop]: Interpolant automaton has 185 states. [2018-12-03 19:34:23,148 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-12-03 19:34:23,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-12-03 19:34:23,148 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:34:23,148 INFO L402 BasicCegarLoop]: trace histogram [61, 61, 60, 1, 1, 1, 1] [2018-12-03 19:34:23,148 INFO L423 AbstractCegarLoop]: === Iteration 122 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:34:23,149 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:34:23,149 INFO L82 PathProgramCache]: Analyzing trace with hash 564879902, now seen corresponding path program 120 times [2018-12-03 19:34:23,149 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:34:23,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:23,149 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:34:23,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:23,150 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:34:23,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:34:25,097 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1891 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:25,098 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:25,098 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:34:25,098 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:34:25,098 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:34:25,098 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:25,098 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 121 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 121 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:34:25,107 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:34:25,107 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:34:25,265 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:34:25,265 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:34:25,275 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:34:25,361 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1891 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:25,362 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:34:28,098 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1891 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:28,118 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:34:28,118 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 64, 64] total 66 [2018-12-03 19:34:28,118 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:34:28,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-12-03 19:34:28,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-12-03 19:34:28,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2085, Invalid=2337, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 19:34:28,119 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 67 states. [2018-12-03 19:34:30,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:34:30,258 INFO L93 Difference]: Finished difference Result 195 states and 196 transitions. [2018-12-03 19:34:30,258 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2018-12-03 19:34:30,258 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 186 [2018-12-03 19:34:30,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:34:30,259 INFO L225 Difference]: With dead ends: 195 [2018-12-03 19:34:30,259 INFO L226 Difference]: Without dead ends: 193 [2018-12-03 19:34:30,260 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 557 GetRequests, 308 SyntacticMatches, 122 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7749 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=6178, Invalid=10334, Unknown=0, NotChecked=0, Total=16512 [2018-12-03 19:34:30,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-12-03 19:34:30,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 189. [2018-12-03 19:34:30,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-12-03 19:34:30,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 190 transitions. [2018-12-03 19:34:30,342 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 190 transitions. Word has length 186 [2018-12-03 19:34:30,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:34:30,342 INFO L480 AbstractCegarLoop]: Abstraction has 189 states and 190 transitions. [2018-12-03 19:34:30,342 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-12-03 19:34:30,342 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 190 transitions. [2018-12-03 19:34:30,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-12-03 19:34:30,343 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:34:30,343 INFO L402 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1] [2018-12-03 19:34:30,343 INFO L423 AbstractCegarLoop]: === Iteration 123 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:34:30,343 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:34:30,343 INFO L82 PathProgramCache]: Analyzing trace with hash 1683639738, now seen corresponding path program 121 times [2018-12-03 19:34:30,343 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:34:30,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:30,344 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:34:30,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:30,344 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:34:30,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:34:35,249 INFO L134 CoverageAnalysis]: Checked inductivity of 5673 backedges. 3782 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:35,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:35,250 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:34:35,250 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:34:35,250 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:34:35,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:35,250 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 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:34:35,259 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:34:35,259 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:34:35,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:34:35,407 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:34:41,399 INFO L134 CoverageAnalysis]: Checked inductivity of 5673 backedges. 3782 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:41,399 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:34:45,948 INFO L134 CoverageAnalysis]: Checked inductivity of 5673 backedges. 3782 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:45,967 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:34:45,968 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [125, 125, 125] total 187 [2018-12-03 19:34:45,968 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:34:45,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 188 states [2018-12-03 19:34:45,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2018-12-03 19:34:45,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7999, Invalid=27157, Unknown=0, NotChecked=0, Total=35156 [2018-12-03 19:34:45,970 INFO L87 Difference]: Start difference. First operand 189 states and 190 transitions. Second operand 188 states. [2018-12-03 19:34:52,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:34:52,567 INFO L93 Difference]: Finished difference Result 317 states and 319 transitions. [2018-12-03 19:34:52,567 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2018-12-03 19:34:52,567 INFO L78 Accepts]: Start accepts. Automaton has 188 states. Word has length 188 [2018-12-03 19:34:52,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:34:52,568 INFO L225 Difference]: With dead ends: 317 [2018-12-03 19:34:52,568 INFO L226 Difference]: Without dead ends: 190 [2018-12-03 19:34:52,569 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 561 GetRequests, 190 SyntacticMatches, 123 SemanticMatches, 248 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22570 ImplicationChecksByTransitivity, 18.3s TimeCoverageRelationStatistics Valid=13982, Invalid=48268, Unknown=0, NotChecked=0, Total=62250 [2018-12-03 19:34:52,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-12-03 19:34:52,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 190. [2018-12-03 19:34:52,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-12-03 19:34:52,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2018-12-03 19:34:52,646 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 188 [2018-12-03 19:34:52,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:34:52,646 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2018-12-03 19:34:52,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has 188 states. [2018-12-03 19:34:52,646 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2018-12-03 19:34:52,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-12-03 19:34:52,647 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:34:52,647 INFO L402 BasicCegarLoop]: trace histogram [62, 62, 61, 1, 1, 1, 1] [2018-12-03 19:34:52,648 INFO L423 AbstractCegarLoop]: === Iteration 124 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:34:52,648 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:34:52,648 INFO L82 PathProgramCache]: Analyzing trace with hash 568015985, now seen corresponding path program 122 times [2018-12-03 19:34:52,648 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:34:52,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:52,649 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:34:52,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:52,649 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:34:52,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:34:54,384 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 1953 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:54,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:54,385 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:34:54,385 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:34:54,385 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:34:54,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:54,385 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 123 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 123 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:34:54,394 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:34:54,394 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:34:54,740 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 62 check-sat command(s) [2018-12-03 19:34:54,740 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:34:54,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:34:54,833 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 1953 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:54,833 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:34:57,920 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 1953 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:57,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:34:57,939 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 65, 65] total 67 [2018-12-03 19:34:57,940 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:34:57,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-12-03 19:34:57,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-12-03 19:34:57,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2150, Invalid=2406, Unknown=0, NotChecked=0, Total=4556 [2018-12-03 19:34:57,940 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand 68 states. [2018-12-03 19:34:59,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:34:59,864 INFO L93 Difference]: Finished difference Result 198 states and 199 transitions. [2018-12-03 19:34:59,864 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 129 states. [2018-12-03 19:34:59,864 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 189 [2018-12-03 19:34:59,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:34:59,864 INFO L225 Difference]: With dead ends: 198 [2018-12-03 19:34:59,865 INFO L226 Difference]: Without dead ends: 196 [2018-12-03 19:34:59,866 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 566 GetRequests, 313 SyntacticMatches, 124 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8000 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=6372, Invalid=10658, Unknown=0, NotChecked=0, Total=17030 [2018-12-03 19:34:59,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-12-03 19:34:59,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 192. [2018-12-03 19:34:59,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-12-03 19:34:59,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 193 transitions. [2018-12-03 19:34:59,948 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 193 transitions. Word has length 189 [2018-12-03 19:34:59,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:34:59,948 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 193 transitions. [2018-12-03 19:34:59,948 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-12-03 19:34:59,948 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 193 transitions. [2018-12-03 19:34:59,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-12-03 19:34:59,949 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:34:59,949 INFO L402 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1, 1, 1] [2018-12-03 19:34:59,949 INFO L423 AbstractCegarLoop]: === Iteration 125 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:34:59,949 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:34:59,949 INFO L82 PathProgramCache]: Analyzing trace with hash 402448205, now seen corresponding path program 123 times [2018-12-03 19:34:59,949 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:34:59,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:59,950 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:34:59,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:59,950 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:35:00,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:35:05,035 INFO L134 CoverageAnalysis]: Checked inductivity of 5859 backedges. 3906 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:05,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:05,036 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:35:05,036 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:35:05,036 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:35:05,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:05,036 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 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:35:05,045 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:35:05,045 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:35:05,202 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:35:05,202 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:35:05,213 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:35:11,716 INFO L134 CoverageAnalysis]: Checked inductivity of 5859 backedges. 3906 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:11,717 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:35:16,577 INFO L134 CoverageAnalysis]: Checked inductivity of 5859 backedges. 3906 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:16,596 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:35:16,596 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [127, 127, 127] total 190 [2018-12-03 19:35:16,596 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:35:16,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 191 states [2018-12-03 19:35:16,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 191 interpolants. [2018-12-03 19:35:16,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8254, Invalid=28036, Unknown=0, NotChecked=0, Total=36290 [2018-12-03 19:35:16,598 INFO L87 Difference]: Start difference. First operand 192 states and 193 transitions. Second operand 191 states. [2018-12-03 19:35:23,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:35:23,155 INFO L93 Difference]: Finished difference Result 322 states and 324 transitions. [2018-12-03 19:35:23,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2018-12-03 19:35:23,155 INFO L78 Accepts]: Start accepts. Automaton has 191 states. Word has length 191 [2018-12-03 19:35:23,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:35:23,156 INFO L225 Difference]: With dead ends: 322 [2018-12-03 19:35:23,156 INFO L226 Difference]: Without dead ends: 193 [2018-12-03 19:35:23,158 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 193 SyntacticMatches, 125 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23312 ImplicationChecksByTransitivity, 19.3s TimeCoverageRelationStatistics Valid=14428, Invalid=49834, Unknown=0, NotChecked=0, Total=64262 [2018-12-03 19:35:23,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-12-03 19:35:23,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 193. [2018-12-03 19:35:23,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2018-12-03 19:35:23,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 194 transitions. [2018-12-03 19:35:23,255 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 194 transitions. Word has length 191 [2018-12-03 19:35:23,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:35:23,255 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 194 transitions. [2018-12-03 19:35:23,255 INFO L481 AbstractCegarLoop]: Interpolant automaton has 191 states. [2018-12-03 19:35:23,256 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 194 transitions. [2018-12-03 19:35:23,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2018-12-03 19:35:23,256 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:35:23,256 INFO L402 BasicCegarLoop]: trace histogram [63, 63, 62, 1, 1, 1, 1] [2018-12-03 19:35:23,257 INFO L423 AbstractCegarLoop]: === Iteration 126 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:35:23,257 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:35:23,257 INFO L82 PathProgramCache]: Analyzing trace with hash -687840970, now seen corresponding path program 124 times [2018-12-03 19:35:23,257 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:35:23,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:23,258 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:35:23,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:23,258 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:35:23,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:35:25,001 INFO L134 CoverageAnalysis]: Checked inductivity of 5922 backedges. 2016 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:25,001 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:25,001 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:35:25,002 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:35:25,002 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:35:25,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:25,002 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 125 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 125 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:35:25,010 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:35:25,010 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:35:25,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:35:25,165 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:35:25,255 INFO L134 CoverageAnalysis]: Checked inductivity of 5922 backedges. 2016 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:25,255 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:35:28,392 INFO L134 CoverageAnalysis]: Checked inductivity of 5922 backedges. 2016 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:28,411 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:35:28,411 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66, 66] total 68 [2018-12-03 19:35:28,411 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:35:28,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-12-03 19:35:28,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-12-03 19:35:28,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2216, Invalid=2476, Unknown=0, NotChecked=0, Total=4692 [2018-12-03 19:35:28,412 INFO L87 Difference]: Start difference. First operand 193 states and 194 transitions. Second operand 69 states. [2018-12-03 19:35:30,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:35:30,427 INFO L93 Difference]: Finished difference Result 201 states and 202 transitions. [2018-12-03 19:35:30,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2018-12-03 19:35:30,427 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 192 [2018-12-03 19:35:30,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:35:30,427 INFO L225 Difference]: With dead ends: 201 [2018-12-03 19:35:30,428 INFO L226 Difference]: Without dead ends: 199 [2018-12-03 19:35:30,428 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 575 GetRequests, 318 SyntacticMatches, 126 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8255 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=6569, Invalid=10987, Unknown=0, NotChecked=0, Total=17556 [2018-12-03 19:35:30,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-12-03 19:35:30,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 195. [2018-12-03 19:35:30,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-12-03 19:35:30,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 196 transitions. [2018-12-03 19:35:30,512 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 196 transitions. Word has length 192 [2018-12-03 19:35:30,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:35:30,513 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 196 transitions. [2018-12-03 19:35:30,513 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-12-03 19:35:30,513 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 196 transitions. [2018-12-03 19:35:30,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-12-03 19:35:30,514 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:35:30,514 INFO L402 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1, 1, 1] [2018-12-03 19:35:30,514 INFO L423 AbstractCegarLoop]: === Iteration 127 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:35:30,514 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:35:30,514 INFO L82 PathProgramCache]: Analyzing trace with hash 409724626, now seen corresponding path program 125 times [2018-12-03 19:35:30,514 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:35:30,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:30,515 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:35:30,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:30,515 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:35:30,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:35:35,760 INFO L134 CoverageAnalysis]: Checked inductivity of 6048 backedges. 4032 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:35,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:35,760 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:35:35,761 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:35:35,761 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:35:35,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:35,761 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:35:35,769 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:35:35,770 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:35:36,148 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 64 check-sat command(s) [2018-12-03 19:35:36,149 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:35:36,156 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:35:42,638 INFO L134 CoverageAnalysis]: Checked inductivity of 6048 backedges. 4032 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:42,638 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:35:47,618 INFO L134 CoverageAnalysis]: Checked inductivity of 6048 backedges. 4032 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:47,638 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:35:47,638 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [129, 129, 129] total 193 [2018-12-03 19:35:47,638 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:35:47,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2018-12-03 19:35:47,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2018-12-03 19:35:47,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8513, Invalid=28929, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 19:35:47,640 INFO L87 Difference]: Start difference. First operand 195 states and 196 transitions. Second operand 194 states. [2018-12-03 19:35:54,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:35:54,482 INFO L93 Difference]: Finished difference Result 327 states and 329 transitions. [2018-12-03 19:35:54,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2018-12-03 19:35:54,482 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 194 [2018-12-03 19:35:54,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:35:54,483 INFO L225 Difference]: With dead ends: 327 [2018-12-03 19:35:54,483 INFO L226 Difference]: Without dead ends: 196 [2018-12-03 19:35:54,485 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 579 GetRequests, 196 SyntacticMatches, 127 SemanticMatches, 256 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24066 ImplicationChecksByTransitivity, 19.6s TimeCoverageRelationStatistics Valid=14881, Invalid=51425, Unknown=0, NotChecked=0, Total=66306 [2018-12-03 19:35:54,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-12-03 19:35:54,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2018-12-03 19:35:54,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-12-03 19:35:54,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 197 transitions. [2018-12-03 19:35:54,594 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 197 transitions. Word has length 194 [2018-12-03 19:35:54,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:35:54,595 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 197 transitions. [2018-12-03 19:35:54,595 INFO L481 AbstractCegarLoop]: Interpolant automaton has 194 states. [2018-12-03 19:35:54,595 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 197 transitions. [2018-12-03 19:35:54,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-12-03 19:35:54,595 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:35:54,596 INFO L402 BasicCegarLoop]: trace histogram [64, 64, 63, 1, 1, 1, 1] [2018-12-03 19:35:54,596 INFO L423 AbstractCegarLoop]: === Iteration 128 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:35:54,596 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:35:54,596 INFO L82 PathProgramCache]: Analyzing trace with hash -1852395447, now seen corresponding path program 126 times [2018-12-03 19:35:54,596 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:35:54,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:54,597 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:35:54,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:54,597 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:35:54,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:35:56,438 INFO L134 CoverageAnalysis]: Checked inductivity of 6112 backedges. 2080 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:56,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:56,439 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:35:56,439 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:35:56,439 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:35:56,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:56,439 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 127 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 127 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:35:56,448 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:35:56,449 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:35:56,616 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:35:56,616 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:35:56,627 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:35:56,790 INFO L134 CoverageAnalysis]: Checked inductivity of 6112 backedges. 2080 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:56,791 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:36:00,067 INFO L134 CoverageAnalysis]: Checked inductivity of 6112 backedges. 2016 proven. 4096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:36:00,086 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:36:00,086 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 72 [2018-12-03 19:36:00,086 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:36:00,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 19:36:00,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 19:36:00,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2363, Invalid=2893, Unknown=0, NotChecked=0, Total=5256 [2018-12-03 19:36:00,088 INFO L87 Difference]: Start difference. First operand 196 states and 197 transitions. Second operand 71 states. [2018-12-03 19:36:02,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:36:02,676 INFO L93 Difference]: Finished difference Result 204 states and 205 transitions. [2018-12-03 19:36:02,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2018-12-03 19:36:02,676 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 195 [2018-12-03 19:36:02,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:36:02,677 INFO L225 Difference]: With dead ends: 204 [2018-12-03 19:36:02,677 INFO L226 Difference]: Without dead ends: 202 [2018-12-03 19:36:02,679 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 583 GetRequests, 321 SyntacticMatches, 127 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8779 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=6779, Invalid=11853, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 19:36:02,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-12-03 19:36:02,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 198. [2018-12-03 19:36:02,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-12-03 19:36:02,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 199 transitions. [2018-12-03 19:36:02,773 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 199 transitions. Word has length 195 [2018-12-03 19:36:02,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:36:02,773 INFO L480 AbstractCegarLoop]: Abstraction has 198 states and 199 transitions. [2018-12-03 19:36:02,774 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 19:36:02,774 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 199 transitions. [2018-12-03 19:36:02,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-12-03 19:36:02,774 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:36:02,775 INFO L402 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1] [2018-12-03 19:36:02,775 INFO L423 AbstractCegarLoop]: === Iteration 129 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:36:02,775 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:36:02,775 INFO L82 PathProgramCache]: Analyzing trace with hash -2035630811, now seen corresponding path program 127 times [2018-12-03 19:36:02,775 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:36:02,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:36:02,776 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:36:02,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:36:02,776 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:36:02,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:36:08,172 INFO L134 CoverageAnalysis]: Checked inductivity of 6240 backedges. 4160 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:36:08,172 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:36:08,172 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:36:08,172 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:36:08,172 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:36:08,172 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:36:08,172 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 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:36:08,182 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:36:08,182 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:36:08,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:36:08,335 INFO L273 TraceCheckSpWp]: Computing forward predicates...