java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_exp_cong.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/seq.i_4.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 16:44:24,215 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 16:44:24,218 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 16:44:24,229 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 16:44:24,229 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 16:44:24,230 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 16:44:24,231 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 16:44:24,233 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 16:44:24,235 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 16:44:24,236 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 16:44:24,237 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-03 16:44:24,237 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-03 16:44:24,238 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-03 16:44:24,239 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-03 16:44:24,240 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-03 16:44:24,240 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-03 16:44:24,241 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-03 16:44:24,243 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-03 16:44:24,245 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-03 16:44:24,247 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-03 16:44:24,248 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-03 16:44:24,249 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-03 16:44:24,251 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-12-03 16:44:24,260 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_exp_cong.epf [2018-12-03 16:44:24,272 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 16:44:24,273 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 16:44:24,274 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 16:44:24,274 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 16:44:24,274 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 16:44:24,274 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 16:44:24,274 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 16:44:24,275 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 16:44:24,275 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-03 16:44:24,275 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 16:44:24,275 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-03 16:44:24,275 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 16:44:24,275 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 16:44:24,276 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 16:44:24,276 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 16:44:24,276 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 16:44:24,277 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 16:44:24,277 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 16:44:24,277 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 16:44:24,277 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 16:44:24,277 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 16:44:24,278 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 16:44:24,278 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 16:44:24,278 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 16:44:24,278 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 16:44:24,278 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 16:44:24,279 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 16:44:24,279 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 16:44:24,279 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 16:44:24,279 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 16:44:24,279 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 16:44:24,280 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 16:44:24,280 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 16:44:24,280 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 16:44:24,280 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 16:44:24,280 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 16:44:24,281 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 16:44:24,281 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 16:44:24,281 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 16:44:24,281 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 16:44:24,281 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 16:44:24,314 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 16:44:24,326 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 16:44:24,330 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 16:44:24,331 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 16:44:24,332 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 16:44:24,332 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/seq.i_4.bpl [2018-12-03 16:44:24,333 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/seq.i_4.bpl' [2018-12-03 16:44:24,370 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 16:44:24,372 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 16:44:24,373 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 16:44:24,373 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 16:44:24,373 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 16:44:24,390 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:44:24" (1/1) ... [2018-12-03 16:44:24,398 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:44:24" (1/1) ... [2018-12-03 16:44:24,406 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 16:44:24,406 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 16:44:24,407 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 16:44:24,407 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 16:44:24,418 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:44:24" (1/1) ... [2018-12-03 16:44:24,418 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:44:24" (1/1) ... [2018-12-03 16:44:24,419 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:44:24" (1/1) ... [2018-12-03 16:44:24,420 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:44:24" (1/1) ... [2018-12-03 16:44:24,423 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:44:24" (1/1) ... [2018-12-03 16:44:24,425 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:44:24" (1/1) ... [2018-12-03 16:44:24,426 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:44:24" (1/1) ... [2018-12-03 16:44:24,427 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 16:44:24,428 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 16:44:24,428 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 16:44:24,428 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 16:44:24,429 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:44:24" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 16:44:24,486 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 16:44:24,486 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 16:44:24,683 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 16:44:24,684 INFO L280 CfgBuilder]: Removed 3 assue(true) statements. [2018-12-03 16:44:24,684 INFO L202 PluginConnector]: Adding new model seq.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 04:44:24 BoogieIcfgContainer [2018-12-03 16:44:24,684 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 16:44:24,686 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 16:44:24,686 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 16:44:24,689 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 16:44:24,689 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:44:24" (1/2) ... [2018-12-03 16:44:24,690 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12b28353 and model type seq.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 04:44:24, skipping insertion in model container [2018-12-03 16:44:24,690 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 04:44:24" (2/2) ... [2018-12-03 16:44:24,692 INFO L112 eAbstractionObserver]: Analyzing ICFG seq.i_4.bpl [2018-12-03 16:44:24,702 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 16:44:24,710 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 16:44:24,729 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 16:44:24,768 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 16:44:24,768 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 16:44:24,768 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 16:44:24,768 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 16:44:24,769 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 16:44:24,769 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 16:44:24,769 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 16:44:24,769 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 16:44:24,787 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states. [2018-12-03 16:44:24,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-03 16:44:24,800 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:24,801 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-12-03 16:44:24,806 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:24,813 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:24,816 INFO L82 PathProgramCache]: Analyzing trace with hash 28787175, now seen corresponding path program 1 times [2018-12-03 16:44:24,818 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:24,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:24,862 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:24,862 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:24,862 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:24,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:25,077 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:44:25,079 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:44:25,080 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 16:44:25,080 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:44:25,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 16:44:25,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 16:44:25,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 16:44:25,103 INFO L87 Difference]: Start difference. First operand 8 states. Second operand 4 states. [2018-12-03 16:44:25,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:25,224 INFO L93 Difference]: Finished difference Result 14 states and 17 transitions. [2018-12-03 16:44:25,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 16:44:25,226 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 5 [2018-12-03 16:44:25,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:25,237 INFO L225 Difference]: With dead ends: 14 [2018-12-03 16:44:25,237 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 16:44:25,241 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 16:44:25,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 16:44:25,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 16:44:25,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 16:44:25,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2018-12-03 16:44:25,275 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 5 [2018-12-03 16:44:25,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:25,276 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2018-12-03 16:44:25,276 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 16:44:25,276 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2018-12-03 16:44:25,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 16:44:25,277 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:25,277 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-12-03 16:44:25,277 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:25,277 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:25,277 INFO L82 PathProgramCache]: Analyzing trace with hash 894126352, now seen corresponding path program 1 times [2018-12-03 16:44:25,277 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:25,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:25,279 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:25,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:25,279 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:25,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:25,368 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 16:44:25,368 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:44:25,368 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-12-03 16:44:25,369 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:44:25,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 16:44:25,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 16:44:25,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-12-03 16:44:25,371 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand 5 states. [2018-12-03 16:44:25,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:25,522 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2018-12-03 16:44:25,522 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 16:44:25,522 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 6 [2018-12-03 16:44:25,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:25,523 INFO L225 Difference]: With dead ends: 15 [2018-12-03 16:44:25,524 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 16:44:25,525 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2018-12-03 16:44:25,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 16:44:25,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 9. [2018-12-03 16:44:25,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 16:44:25,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2018-12-03 16:44:25,529 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2018-12-03 16:44:25,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:25,529 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2018-12-03 16:44:25,530 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 16:44:25,530 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2018-12-03 16:44:25,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 16:44:25,530 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:25,531 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2018-12-03 16:44:25,531 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:25,531 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:25,532 INFO L82 PathProgramCache]: Analyzing trace with hash 262017386, now seen corresponding path program 1 times [2018-12-03 16:44:25,532 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:25,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:25,533 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:25,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:25,533 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:25,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:25,702 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 16:44:25,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:25,703 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:25,704 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 9 with the following transitions: [2018-12-03 16:44:25,706 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9], [13], [15], [17] [2018-12-03 16:44:25,757 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:44:25,757 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:44:26,032 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:44:26,034 INFO L272 AbstractInterpreter]: Visited 7 different actions 27 times. Merged at 6 different actions 17 times. Widened at 2 different actions 2 times. Found 5 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 16:44:26,057 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:26,058 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:44:26,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:26,059 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:26,071 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:26,072 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:44:26,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:26,112 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:26,403 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 16:44:26,403 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:26,446 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 16:44:26,465 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:26,465 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-12-03 16:44:26,465 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:26,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 16:44:26,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 16:44:26,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2018-12-03 16:44:26,466 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 10 states. [2018-12-03 16:44:26,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:26,720 INFO L93 Difference]: Finished difference Result 17 states and 19 transitions. [2018-12-03 16:44:26,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 16:44:26,722 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 8 [2018-12-03 16:44:26,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:26,723 INFO L225 Difference]: With dead ends: 17 [2018-12-03 16:44:26,723 INFO L226 Difference]: Without dead ends: 10 [2018-12-03 16:44:26,724 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 8 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2018-12-03 16:44:26,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-12-03 16:44:26,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-12-03 16:44:26,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-12-03 16:44:26,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2018-12-03 16:44:26,728 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 8 [2018-12-03 16:44:26,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:26,728 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2018-12-03 16:44:26,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 16:44:26,729 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2018-12-03 16:44:26,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 16:44:26,729 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:26,729 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2018-12-03 16:44:26,730 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:26,730 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:26,730 INFO L82 PathProgramCache]: Analyzing trace with hash 1187728801, now seen corresponding path program 2 times [2018-12-03 16:44:26,730 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:26,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:26,732 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:26,732 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:26,732 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:26,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:26,841 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 16:44:26,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:26,842 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:26,842 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:26,842 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:26,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:26,842 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:26,852 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:44:26,852 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:44:26,881 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-12-03 16:44:26,881 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:26,883 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:26,969 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 16:44:26,969 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:27,005 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 16:44:27,024 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:27,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 7 [2018-12-03 16:44:27,025 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:27,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 16:44:27,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 16:44:27,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-12-03 16:44:27,026 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand 8 states. [2018-12-03 16:44:27,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:27,304 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2018-12-03 16:44:27,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 16:44:27,305 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 9 [2018-12-03 16:44:27,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:27,306 INFO L225 Difference]: With dead ends: 18 [2018-12-03 16:44:27,306 INFO L226 Difference]: Without dead ends: 16 [2018-12-03 16:44:27,307 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 13 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2018-12-03 16:44:27,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-12-03 16:44:27,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 12. [2018-12-03 16:44:27,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-12-03 16:44:27,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2018-12-03 16:44:27,311 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 9 [2018-12-03 16:44:27,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:27,311 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2018-12-03 16:44:27,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 16:44:27,312 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2018-12-03 16:44:27,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-12-03 16:44:27,312 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:27,312 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2018-12-03 16:44:27,313 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:27,313 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:27,313 INFO L82 PathProgramCache]: Analyzing trace with hash -1053870661, now seen corresponding path program 3 times [2018-12-03 16:44:27,313 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:27,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:27,314 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:27,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:27,315 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:27,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:27,511 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 16:44:27,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:27,511 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:27,511 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:27,511 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:27,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:27,512 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:27,521 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:44:27,521 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:44:27,540 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:44:27,540 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:27,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:27,702 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 16:44:27,703 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:27,783 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 16:44:27,802 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:27,802 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-12-03 16:44:27,802 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:27,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 16:44:27,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 16:44:27,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2018-12-03 16:44:27,804 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 14 states. [2018-12-03 16:44:27,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:27,958 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2018-12-03 16:44:27,958 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 16:44:27,958 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 11 [2018-12-03 16:44:27,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:27,959 INFO L225 Difference]: With dead ends: 22 [2018-12-03 16:44:27,959 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 16:44:27,959 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 10 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:44:27,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 16:44:27,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-12-03 16:44:27,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-12-03 16:44:27,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-12-03 16:44:27,963 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2018-12-03 16:44:27,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:27,964 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-12-03 16:44:27,964 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 16:44:27,964 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-12-03 16:44:27,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 16:44:27,964 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:27,965 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1] [2018-12-03 16:44:27,965 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:27,965 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:27,965 INFO L82 PathProgramCache]: Analyzing trace with hash -1170114012, now seen corresponding path program 4 times [2018-12-03 16:44:27,965 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:27,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:27,966 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:27,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:27,967 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:28,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:28,325 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 16:44:28,326 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:28,326 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:28,326 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:28,326 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:28,326 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:28,327 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 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:28,336 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:28,337 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:44:28,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:28,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:28,497 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 16:44:28,497 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:28,682 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 16:44:28,704 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:28,704 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 8 [2018-12-03 16:44:28,704 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:28,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 16:44:28,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 16:44:28,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-12-03 16:44:28,705 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 9 states. [2018-12-03 16:44:28,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:28,890 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2018-12-03 16:44:28,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 16:44:28,890 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 12 [2018-12-03 16:44:28,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:28,891 INFO L225 Difference]: With dead ends: 21 [2018-12-03 16:44:28,891 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 16:44:28,892 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 6 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2018-12-03 16:44:28,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 16:44:28,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2018-12-03 16:44:28,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 16:44:28,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-12-03 16:44:28,896 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2018-12-03 16:44:28,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:28,897 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-12-03 16:44:28,897 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 16:44:28,897 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-12-03 16:44:28,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 16:44:28,898 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:28,898 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1] [2018-12-03 16:44:28,898 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:28,898 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:28,898 INFO L82 PathProgramCache]: Analyzing trace with hash 801918334, now seen corresponding path program 5 times [2018-12-03 16:44:28,898 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:28,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:28,899 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:28,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:28,899 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:28,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:29,009 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 16:44:29,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:29,010 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:29,010 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:29,010 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:29,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:29,010 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:29,019 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:44:29,020 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:44:29,034 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 16:44:29,034 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:29,037 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:29,187 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 16:44:29,187 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:29,241 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 16:44:29,267 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:29,268 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-12-03 16:44:29,268 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:29,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 16:44:29,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 16:44:29,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=229, Unknown=0, NotChecked=0, Total=306 [2018-12-03 16:44:29,269 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 18 states. [2018-12-03 16:44:29,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:29,390 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2018-12-03 16:44:29,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 16:44:29,390 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 14 [2018-12-03 16:44:29,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:29,391 INFO L225 Difference]: With dead ends: 27 [2018-12-03 16:44:29,391 INFO L226 Difference]: Without dead ends: 16 [2018-12-03 16:44:29,392 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 12 SyntacticMatches, 7 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=343, Unknown=0, NotChecked=0, Total=462 [2018-12-03 16:44:29,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-12-03 16:44:29,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-12-03 16:44:29,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-12-03 16:44:29,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-12-03 16:44:29,396 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2018-12-03 16:44:29,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:29,397 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-12-03 16:44:29,397 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 16:44:29,397 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-12-03 16:44:29,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-12-03 16:44:29,397 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:29,397 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1] [2018-12-03 16:44:29,398 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:29,398 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:29,398 INFO L82 PathProgramCache]: Analyzing trace with hash -460110731, now seen corresponding path program 6 times [2018-12-03 16:44:29,398 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:29,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:29,399 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:29,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:29,400 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:29,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:29,539 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 16:44:29,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:29,539 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:29,540 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:29,540 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:29,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:29,540 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:29,548 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:44:29,549 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:44:29,563 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:44:29,563 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:29,565 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:29,633 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 16:44:29,633 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:29,684 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 16:44:29,703 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:29,703 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 9 [2018-12-03 16:44:29,703 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:29,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 16:44:29,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 16:44:29,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-12-03 16:44:29,704 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 10 states. [2018-12-03 16:44:29,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:29,809 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2018-12-03 16:44:29,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 16:44:29,810 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 15 [2018-12-03 16:44:29,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:29,811 INFO L225 Difference]: With dead ends: 24 [2018-12-03 16:44:29,811 INFO L226 Difference]: Without dead ends: 22 [2018-12-03 16:44:29,811 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 8 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=131, Unknown=0, NotChecked=0, Total=210 [2018-12-03 16:44:29,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-03 16:44:29,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 18. [2018-12-03 16:44:29,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-12-03 16:44:29,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-12-03 16:44:29,816 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 15 [2018-12-03 16:44:29,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:29,816 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-12-03 16:44:29,816 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 16:44:29,817 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-12-03 16:44:29,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-12-03 16:44:29,817 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:29,817 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1] [2018-12-03 16:44:29,818 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:29,818 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:29,818 INFO L82 PathProgramCache]: Analyzing trace with hash 215271311, now seen corresponding path program 7 times [2018-12-03 16:44:29,818 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:29,819 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:29,819 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:29,819 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:29,820 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:29,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:29,959 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 16:44:29,959 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:29,959 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:29,959 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:29,959 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:29,959 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:29,960 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:29,970 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:29,970 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:44:29,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:29,988 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:30,229 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 16:44:30,229 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:30,431 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 16:44:30,450 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:30,450 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-12-03 16:44:30,451 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:30,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 16:44:30,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 16:44:30,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=351, Unknown=0, NotChecked=0, Total=462 [2018-12-03 16:44:30,452 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 22 states. [2018-12-03 16:44:30,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:30,934 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2018-12-03 16:44:30,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 16:44:30,934 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 17 [2018-12-03 16:44:30,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:30,935 INFO L225 Difference]: With dead ends: 32 [2018-12-03 16:44:30,935 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 16:44:30,936 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 14 SyntacticMatches, 9 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=171, Invalid=531, Unknown=0, NotChecked=0, Total=702 [2018-12-03 16:44:30,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 16:44:30,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-12-03 16:44:30,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 16:44:30,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-12-03 16:44:30,941 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2018-12-03 16:44:30,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:30,941 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-12-03 16:44:30,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 16:44:30,942 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-12-03 16:44:30,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 16:44:30,942 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:30,943 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1] [2018-12-03 16:44:30,943 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:30,943 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:30,943 INFO L82 PathProgramCache]: Analyzing trace with hash 1251105080, now seen corresponding path program 8 times [2018-12-03 16:44:30,943 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:30,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:30,944 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:30,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:30,945 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:30,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:31,158 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 16:44:31,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:31,159 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:31,159 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:31,159 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:31,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:31,159 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:31,179 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:44:31,179 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:44:31,270 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-12-03 16:44:31,271 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:31,273 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:31,443 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 16:44:31,443 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:31,499 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 16:44:31,518 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:31,518 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 10 [2018-12-03 16:44:31,519 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:31,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 16:44:31,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 16:44:31,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2018-12-03 16:44:31,520 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 11 states. [2018-12-03 16:44:31,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:31,647 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2018-12-03 16:44:31,648 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 16:44:31,648 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2018-12-03 16:44:31,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:31,649 INFO L225 Difference]: With dead ends: 27 [2018-12-03 16:44:31,649 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 16:44:31,650 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 28 SyntacticMatches, 10 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=102, Invalid=170, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:44:31,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 16:44:31,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 21. [2018-12-03 16:44:31,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 16:44:31,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-12-03 16:44:31,656 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2018-12-03 16:44:31,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:31,656 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-12-03 16:44:31,656 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 16:44:31,657 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-12-03 16:44:31,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 16:44:31,657 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:31,657 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1] [2018-12-03 16:44:31,658 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:31,658 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:31,658 INFO L82 PathProgramCache]: Analyzing trace with hash -278808686, now seen corresponding path program 9 times [2018-12-03 16:44:31,658 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:31,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:31,659 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:31,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:31,659 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:31,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:31,874 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 16:44:31,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:31,875 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:31,875 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:31,875 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:31,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:31,876 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:31,885 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:44:31,885 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:44:31,930 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:44:31,930 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:31,933 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:32,506 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 16:44:32,506 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:32,575 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 16:44:32,596 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:32,596 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-12-03 16:44:32,596 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:32,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 16:44:32,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 16:44:32,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=499, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:44:32,598 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 26 states. [2018-12-03 16:44:32,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:32,853 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2018-12-03 16:44:32,854 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 16:44:32,854 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 20 [2018-12-03 16:44:32,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:32,857 INFO L225 Difference]: With dead ends: 37 [2018-12-03 16:44:32,857 INFO L226 Difference]: Without dead ends: 22 [2018-12-03 16:44:32,858 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 16 SyntacticMatches, 11 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=232, Invalid=760, Unknown=0, NotChecked=0, Total=992 [2018-12-03 16:44:32,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-03 16:44:32,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-12-03 16:44:32,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-12-03 16:44:32,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-12-03 16:44:32,863 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 20 [2018-12-03 16:44:32,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:32,864 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-12-03 16:44:32,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 16:44:32,864 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-12-03 16:44:32,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:44:32,865 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:32,865 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1] [2018-12-03 16:44:32,865 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:32,865 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:32,865 INFO L82 PathProgramCache]: Analyzing trace with hash -1095018167, now seen corresponding path program 10 times [2018-12-03 16:44:32,866 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:32,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:32,867 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:32,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:32,867 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:32,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:33,069 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 16:44:33,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:33,069 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:33,069 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:33,070 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:33,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:33,070 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:33,080 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:33,080 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:44:33,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:33,103 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:33,161 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 16:44:33,161 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:33,258 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 16:44:33,277 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:33,277 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 11 [2018-12-03 16:44:33,277 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:33,278 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 16:44:33,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 16:44:33,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2018-12-03 16:44:33,279 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 12 states. [2018-12-03 16:44:33,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:33,426 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2018-12-03 16:44:33,426 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 16:44:33,426 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2018-12-03 16:44:33,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:33,427 INFO L225 Difference]: With dead ends: 30 [2018-12-03 16:44:33,428 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 16:44:33,429 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 33 SyntacticMatches, 12 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=128, Invalid=214, Unknown=0, NotChecked=0, Total=342 [2018-12-03 16:44:33,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 16:44:33,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 24. [2018-12-03 16:44:33,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-03 16:44:33,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-12-03 16:44:33,436 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2018-12-03 16:44:33,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:33,436 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-12-03 16:44:33,436 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 16:44:33,436 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-12-03 16:44:33,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 16:44:33,437 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:33,437 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1] [2018-12-03 16:44:33,437 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:33,438 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:33,438 INFO L82 PathProgramCache]: Analyzing trace with hash -45418653, now seen corresponding path program 11 times [2018-12-03 16:44:33,438 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:33,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:33,439 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:33,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:33,439 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:33,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:33,649 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 16:44:33,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:33,650 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:33,650 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:33,650 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:33,651 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:33,651 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:33,660 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:44:33,660 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:44:33,699 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-12-03 16:44:33,699 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:33,701 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:34,013 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 16:44:34,013 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:34,127 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 16:44:34,146 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:34,146 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2018-12-03 16:44:34,146 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:34,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-12-03 16:44:34,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-12-03 16:44:34,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=673, Unknown=0, NotChecked=0, Total=870 [2018-12-03 16:44:34,147 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 30 states. [2018-12-03 16:44:34,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:34,391 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2018-12-03 16:44:34,391 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 16:44:34,391 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 23 [2018-12-03 16:44:34,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:34,392 INFO L225 Difference]: With dead ends: 42 [2018-12-03 16:44:34,392 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 16:44:34,393 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 18 SyntacticMatches, 13 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 590 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=302, Invalid=1030, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 16:44:34,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 16:44:34,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-12-03 16:44:34,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 16:44:34,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-12-03 16:44:34,399 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 23 [2018-12-03 16:44:34,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:34,399 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2018-12-03 16:44:34,399 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-12-03 16:44:34,399 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2018-12-03 16:44:34,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 16:44:34,400 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:34,400 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1] [2018-12-03 16:44:34,400 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:34,401 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:34,401 INFO L82 PathProgramCache]: Analyzing trace with hash -1932204468, now seen corresponding path program 12 times [2018-12-03 16:44:34,401 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:34,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:34,402 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:34,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:34,402 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:34,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:34,566 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 16:44:34,567 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:34,567 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:34,567 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:34,567 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:34,567 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:34,567 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:34,576 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:44:34,576 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:44:34,594 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:44:34,595 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:34,597 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:34,759 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 16:44:34,759 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:34,859 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 16:44:34,877 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:34,877 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 12 [2018-12-03 16:44:34,878 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:34,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 16:44:34,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 16:44:34,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2018-12-03 16:44:34,879 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 13 states. [2018-12-03 16:44:35,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:35,127 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2018-12-03 16:44:35,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 16:44:35,128 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-12-03 16:44:35,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:35,128 INFO L225 Difference]: With dead ends: 33 [2018-12-03 16:44:35,128 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 16:44:35,129 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 38 SyntacticMatches, 14 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=263, Unknown=0, NotChecked=0, Total=420 [2018-12-03 16:44:35,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 16:44:35,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 27. [2018-12-03 16:44:35,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 16:44:35,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-12-03 16:44:35,134 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2018-12-03 16:44:35,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:35,135 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-12-03 16:44:35,135 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 16:44:35,135 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-12-03 16:44:35,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 16:44:35,136 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:35,136 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1] [2018-12-03 16:44:35,136 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:35,136 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:35,136 INFO L82 PathProgramCache]: Analyzing trace with hash -1422569562, now seen corresponding path program 13 times [2018-12-03 16:44:35,137 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:35,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:35,137 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:35,138 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:35,138 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:35,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:35,308 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 16:44:35,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:35,309 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:35,309 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:35,309 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:35,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:35,310 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:35,320 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:35,320 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:44:35,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:35,355 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:35,682 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 16:44:35,683 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:35,928 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 16:44:35,946 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:35,946 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-12-03 16:44:35,947 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:35,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-12-03 16:44:35,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-12-03 16:44:35,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=873, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 16:44:35,948 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 34 states. [2018-12-03 16:44:36,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:36,245 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-12-03 16:44:36,245 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 16:44:36,246 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 26 [2018-12-03 16:44:36,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:36,246 INFO L225 Difference]: With dead ends: 47 [2018-12-03 16:44:36,246 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 16:44:36,248 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 20 SyntacticMatches, 15 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 786 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=381, Invalid=1341, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 16:44:36,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 16:44:36,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-12-03 16:44:36,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-03 16:44:36,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-12-03 16:44:36,253 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 26 [2018-12-03 16:44:36,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:36,253 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-12-03 16:44:36,254 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-12-03 16:44:36,254 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-12-03 16:44:36,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-03 16:44:36,254 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:36,255 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1] [2018-12-03 16:44:36,255 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:36,255 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:36,255 INFO L82 PathProgramCache]: Analyzing trace with hash 1873185821, now seen corresponding path program 14 times [2018-12-03 16:44:36,255 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:36,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:36,256 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:36,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:36,256 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:36,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:37,059 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 16:44:37,060 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:37,060 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:37,060 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:37,060 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:37,060 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:37,060 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:37,070 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:44:37,070 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:44:37,146 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-12-03 16:44:37,147 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:37,149 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:37,174 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 16:44:37,174 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:37,297 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 16:44:37,316 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:37,316 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 13 [2018-12-03 16:44:37,316 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:37,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 16:44:37,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 16:44:37,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2018-12-03 16:44:37,318 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 14 states. [2018-12-03 16:44:37,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:37,510 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2018-12-03 16:44:37,510 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 16:44:37,511 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2018-12-03 16:44:37,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:37,511 INFO L225 Difference]: With dead ends: 36 [2018-12-03 16:44:37,511 INFO L226 Difference]: Without dead ends: 34 [2018-12-03 16:44:37,512 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 43 SyntacticMatches, 16 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=189, Invalid=317, Unknown=0, NotChecked=0, Total=506 [2018-12-03 16:44:37,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-12-03 16:44:37,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2018-12-03 16:44:37,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-03 16:44:37,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-12-03 16:44:37,517 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 27 [2018-12-03 16:44:37,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:37,517 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-12-03 16:44:37,517 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 16:44:37,518 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-12-03 16:44:37,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-12-03 16:44:37,518 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:37,518 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1] [2018-12-03 16:44:37,518 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:37,519 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:37,519 INFO L82 PathProgramCache]: Analyzing trace with hash 540329271, now seen corresponding path program 15 times [2018-12-03 16:44:37,519 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:37,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:37,520 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:37,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:37,520 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:37,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:37,802 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 16:44:37,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:37,803 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:37,803 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:37,803 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:37,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:37,803 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:37,811 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:44:37,812 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:44:37,836 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:44:37,836 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:37,839 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:38,266 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 16:44:38,266 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:38,379 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 16:44:38,398 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:38,398 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-12-03 16:44:38,398 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:38,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 16:44:38,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 16:44:38,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=1099, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 16:44:38,400 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 38 states. [2018-12-03 16:44:38,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:38,923 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2018-12-03 16:44:38,924 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 16:44:38,925 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 29 [2018-12-03 16:44:38,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:38,925 INFO L225 Difference]: With dead ends: 52 [2018-12-03 16:44:38,926 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 16:44:38,927 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 22 SyntacticMatches, 17 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1010 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=469, Invalid=1693, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 16:44:38,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 16:44:38,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-12-03 16:44:38,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 16:44:38,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-12-03 16:44:38,935 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 29 [2018-12-03 16:44:38,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:38,936 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-12-03 16:44:38,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 16:44:38,936 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-12-03 16:44:38,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 16:44:38,937 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:38,937 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1] [2018-12-03 16:44:38,937 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:38,937 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:38,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1436557664, now seen corresponding path program 16 times [2018-12-03 16:44:38,940 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:38,941 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:38,941 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:38,941 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:38,942 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:38,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:39,448 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 16:44:39,449 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:39,449 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:39,449 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:39,449 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:39,449 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:39,449 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:39,460 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:39,460 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:44:39,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:39,486 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:39,571 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 16:44:39,571 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:39,664 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 16:44:39,685 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:39,685 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 14 [2018-12-03 16:44:39,685 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:39,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 16:44:39,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 16:44:39,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=127, Unknown=0, NotChecked=0, Total=210 [2018-12-03 16:44:39,686 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 15 states. [2018-12-03 16:44:39,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:39,890 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-12-03 16:44:39,891 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 16:44:39,891 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 30 [2018-12-03 16:44:39,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:39,892 INFO L225 Difference]: With dead ends: 39 [2018-12-03 16:44:39,892 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 16:44:39,893 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 48 SyntacticMatches, 18 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=224, Invalid=376, Unknown=0, NotChecked=0, Total=600 [2018-12-03 16:44:39,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 16:44:39,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33. [2018-12-03 16:44:39,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-03 16:44:39,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-12-03 16:44:39,902 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2018-12-03 16:44:39,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:39,902 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-12-03 16:44:39,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 16:44:39,902 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-12-03 16:44:39,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 16:44:39,903 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:39,903 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1] [2018-12-03 16:44:39,904 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:39,904 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:39,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1847465402, now seen corresponding path program 17 times [2018-12-03 16:44:39,904 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:39,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:39,905 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:39,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:39,905 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:39,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:40,759 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 16:44:40,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:40,760 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:40,760 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:40,761 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:40,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:40,761 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:40,769 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:44:40,769 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:44:40,805 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-12-03 16:44:40,806 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:40,808 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:41,434 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 16:44:41,435 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:41,984 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 16:44:42,002 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:42,003 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2018-12-03 16:44:42,003 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:42,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-12-03 16:44:42,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-12-03 16:44:42,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=1351, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 16:44:42,004 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 42 states. [2018-12-03 16:44:42,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:42,397 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-12-03 16:44:42,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-03 16:44:42,398 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 32 [2018-12-03 16:44:42,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:42,399 INFO L225 Difference]: With dead ends: 57 [2018-12-03 16:44:42,399 INFO L226 Difference]: Without dead ends: 34 [2018-12-03 16:44:42,400 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 24 SyntacticMatches, 19 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1262 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=566, Invalid=2086, Unknown=0, NotChecked=0, Total=2652 [2018-12-03 16:44:42,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-12-03 16:44:42,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-12-03 16:44:42,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-12-03 16:44:42,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2018-12-03 16:44:42,406 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 32 [2018-12-03 16:44:42,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:42,407 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2018-12-03 16:44:42,407 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-12-03 16:44:42,407 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2018-12-03 16:44:42,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-12-03 16:44:42,407 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:42,407 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1] [2018-12-03 16:44:42,410 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:42,410 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:42,410 INFO L82 PathProgramCache]: Analyzing trace with hash -424157967, now seen corresponding path program 18 times [2018-12-03 16:44:42,410 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:42,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:42,411 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:42,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:42,411 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:42,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:42,648 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 16:44:42,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:42,648 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:42,648 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:42,648 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:42,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:42,649 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:42,657 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:44:42,658 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:44:42,680 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:44:42,681 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:42,683 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:42,697 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 16:44:42,697 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:42,795 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 16:44:42,814 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:42,815 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 15 [2018-12-03 16:44:42,815 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:42,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 16:44:42,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 16:44:42,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=144, Unknown=0, NotChecked=0, Total=240 [2018-12-03 16:44:42,816 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 16 states. [2018-12-03 16:44:43,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:43,004 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2018-12-03 16:44:43,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 16:44:43,004 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2018-12-03 16:44:43,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:43,005 INFO L225 Difference]: With dead ends: 42 [2018-12-03 16:44:43,005 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 16:44:43,006 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 53 SyntacticMatches, 20 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=262, Invalid=440, Unknown=0, NotChecked=0, Total=702 [2018-12-03 16:44:43,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 16:44:43,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 36. [2018-12-03 16:44:43,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-12-03 16:44:43,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-12-03 16:44:43,012 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 33 [2018-12-03 16:44:43,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:43,012 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-12-03 16:44:43,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 16:44:43,012 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-12-03 16:44:43,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-12-03 16:44:43,013 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:43,013 INFO L402 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1] [2018-12-03 16:44:43,013 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:43,013 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:43,013 INFO L82 PathProgramCache]: Analyzing trace with hash 406139147, now seen corresponding path program 19 times [2018-12-03 16:44:43,013 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:43,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:43,014 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:43,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:43,014 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:43,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:43,952 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 16:44:43,953 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:43,953 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:43,953 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:43,953 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:43,953 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:43,953 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:43,962 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:43,963 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:44:43,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:43,992 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:44,402 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 16:44:44,402 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:44,588 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 16:44:44,608 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:44,608 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-12-03 16:44:44,608 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:44,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-12-03 16:44:44,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-12-03 16:44:44,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=1629, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 16:44:44,610 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 46 states. [2018-12-03 16:44:45,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:45,137 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2018-12-03 16:44:45,137 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 16:44:45,137 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 35 [2018-12-03 16:44:45,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:45,138 INFO L225 Difference]: With dead ends: 62 [2018-12-03 16:44:45,138 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 16:44:45,139 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 26 SyntacticMatches, 21 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1542 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=672, Invalid=2520, Unknown=0, NotChecked=0, Total=3192 [2018-12-03 16:44:45,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 16:44:45,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-12-03 16:44:45,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 16:44:45,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-12-03 16:44:45,146 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 35 [2018-12-03 16:44:45,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:45,146 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2018-12-03 16:44:45,146 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-12-03 16:44:45,146 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2018-12-03 16:44:45,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-12-03 16:44:45,151 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:45,151 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1] [2018-12-03 16:44:45,151 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:45,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:45,152 INFO L82 PathProgramCache]: Analyzing trace with hash -2020930956, now seen corresponding path program 20 times [2018-12-03 16:44:45,152 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:45,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:45,153 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:45,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:45,153 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:45,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:45,473 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 16:44:45,473 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:45,473 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:45,473 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:45,473 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:45,473 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:45,473 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:45,482 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:44:45,482 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:44:45,517 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-12-03 16:44:45,518 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:45,520 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:45,540 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 16:44:45,540 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:45,685 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 16:44:45,703 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:45,704 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 16 [2018-12-03 16:44:45,704 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:45,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:44:45,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:44:45,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=162, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:44:45,705 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 17 states. [2018-12-03 16:44:45,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:45,952 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2018-12-03 16:44:45,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 16:44:45,955 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 36 [2018-12-03 16:44:45,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:45,955 INFO L225 Difference]: With dead ends: 45 [2018-12-03 16:44:45,955 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 16:44:45,956 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 58 SyntacticMatches, 22 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=303, Invalid=509, Unknown=0, NotChecked=0, Total=812 [2018-12-03 16:44:45,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 16:44:45,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 39. [2018-12-03 16:44:45,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 16:44:45,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-12-03 16:44:45,964 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2018-12-03 16:44:45,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:45,964 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-12-03 16:44:45,964 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:44:45,964 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-12-03 16:44:45,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 16:44:45,965 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:45,965 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1] [2018-12-03 16:44:45,965 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:45,965 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:45,965 INFO L82 PathProgramCache]: Analyzing trace with hash -789378610, now seen corresponding path program 21 times [2018-12-03 16:44:45,966 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:45,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:45,966 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:45,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:45,967 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:45,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:46,504 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 16:44:46,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:46,504 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:46,504 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:46,504 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:46,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:46,505 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:46,513 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:44:46,513 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:44:46,541 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:44:46,541 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:46,544 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:47,550 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 16:44:47,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:47,889 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 16:44:47,908 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:47,908 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-12-03 16:44:47,908 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:47,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 16:44:47,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 16:44:47,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=517, Invalid=1933, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 16:44:47,910 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 50 states. [2018-12-03 16:44:48,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:48,465 INFO L93 Difference]: Finished difference Result 67 states and 69 transitions. [2018-12-03 16:44:48,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 16:44:48,465 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 38 [2018-12-03 16:44:48,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:48,466 INFO L225 Difference]: With dead ends: 67 [2018-12-03 16:44:48,466 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 16:44:48,467 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 28 SyntacticMatches, 23 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1850 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=787, Invalid=2995, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 16:44:48,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 16:44:48,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-12-03 16:44:48,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-12-03 16:44:48,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2018-12-03 16:44:48,476 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 38 [2018-12-03 16:44:48,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:48,476 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2018-12-03 16:44:48,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 16:44:48,477 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2018-12-03 16:44:48,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-12-03 16:44:48,477 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:48,477 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1] [2018-12-03 16:44:48,477 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:48,478 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:48,478 INFO L82 PathProgramCache]: Analyzing trace with hash 139611077, now seen corresponding path program 22 times [2018-12-03 16:44:48,478 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:48,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:48,479 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:48,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:48,479 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:48,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:48,704 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 16:44:48,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:48,705 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:48,705 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:48,705 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:48,705 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:48,705 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:48,715 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:48,715 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:44:48,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:48,746 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:48,793 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 16:44:48,794 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:48,925 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 16:44:48,944 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:48,944 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 17 [2018-12-03 16:44:48,944 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:48,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 16:44:48,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 16:44:48,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=181, Unknown=0, NotChecked=0, Total=306 [2018-12-03 16:44:48,945 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 18 states. [2018-12-03 16:44:49,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:49,302 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2018-12-03 16:44:49,302 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 16:44:49,302 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 39 [2018-12-03 16:44:49,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:49,303 INFO L225 Difference]: With dead ends: 48 [2018-12-03 16:44:49,303 INFO L226 Difference]: Without dead ends: 46 [2018-12-03 16:44:49,304 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 63 SyntacticMatches, 24 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=347, Invalid=583, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:44:49,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-12-03 16:44:49,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2018-12-03 16:44:49,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-03 16:44:49,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-12-03 16:44:49,314 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 39 [2018-12-03 16:44:49,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:49,314 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-12-03 16:44:49,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 16:44:49,314 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-12-03 16:44:49,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-12-03 16:44:49,315 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:49,315 INFO L402 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1] [2018-12-03 16:44:49,315 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:49,315 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:49,315 INFO L82 PathProgramCache]: Analyzing trace with hash 1022311135, now seen corresponding path program 23 times [2018-12-03 16:44:49,315 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:49,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:49,317 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:49,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:49,317 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:49,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:49,946 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 16:44:49,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:49,946 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:49,947 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:49,947 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:49,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:49,947 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:49,955 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:44:49,955 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:44:49,992 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-12-03 16:44:49,992 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:49,994 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:50,538 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 16:44:50,538 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:50,767 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 16:44:50,785 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:50,785 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2018-12-03 16:44:50,785 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:50,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-12-03 16:44:50,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-12-03 16:44:50,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=599, Invalid=2263, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 16:44:50,787 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 54 states. [2018-12-03 16:44:51,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:51,370 INFO L93 Difference]: Finished difference Result 72 states and 74 transitions. [2018-12-03 16:44:51,370 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-03 16:44:51,370 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 41 [2018-12-03 16:44:51,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:51,371 INFO L225 Difference]: With dead ends: 72 [2018-12-03 16:44:51,371 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 16:44:51,372 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 30 SyntacticMatches, 25 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2186 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=911, Invalid=3511, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 16:44:51,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 16:44:51,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-12-03 16:44:51,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-12-03 16:44:51,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-12-03 16:44:51,380 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 41 [2018-12-03 16:44:51,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:51,380 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-12-03 16:44:51,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-12-03 16:44:51,380 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-12-03 16:44:51,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 16:44:51,381 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:51,381 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1] [2018-12-03 16:44:51,381 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:51,381 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:51,381 INFO L82 PathProgramCache]: Analyzing trace with hash -215178872, now seen corresponding path program 24 times [2018-12-03 16:44:51,381 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:51,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:51,382 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:51,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:51,382 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:51,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:51,691 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 16:44:51,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:51,691 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:51,691 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:51,692 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:51,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:51,692 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:51,700 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:44:51,700 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:44:51,730 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:44:51,730 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:51,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:51,830 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 16:44:51,830 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:51,999 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 16:44:52,019 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:52,019 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 18 [2018-12-03 16:44:52,019 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:52,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 16:44:52,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 16:44:52,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=201, Unknown=0, NotChecked=0, Total=342 [2018-12-03 16:44:52,020 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 19 states. [2018-12-03 16:44:52,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:52,273 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2018-12-03 16:44:52,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 16:44:52,273 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2018-12-03 16:44:52,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:52,274 INFO L225 Difference]: With dead ends: 51 [2018-12-03 16:44:52,274 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 16:44:52,274 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 68 SyntacticMatches, 26 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=394, Invalid=662, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 16:44:52,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 16:44:52,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 45. [2018-12-03 16:44:52,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 16:44:52,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-12-03 16:44:52,283 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2018-12-03 16:44:52,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:52,283 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-12-03 16:44:52,283 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 16:44:52,284 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-12-03 16:44:52,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 16:44:52,284 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:52,284 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1] [2018-12-03 16:44:52,284 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:52,285 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:52,285 INFO L82 PathProgramCache]: Analyzing trace with hash -628413470, now seen corresponding path program 25 times [2018-12-03 16:44:52,285 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:52,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:52,286 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:52,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:52,286 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:52,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:53,328 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 16:44:53,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:53,329 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:53,329 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:53,329 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:53,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:53,330 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:53,338 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:53,339 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:44:53,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:53,373 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:54,050 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 16:44:54,050 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:54,297 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 16:44:54,316 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:54,316 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-12-03 16:44:54,316 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:54,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-12-03 16:44:54,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-12-03 16:44:54,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=687, Invalid=2619, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 16:44:54,319 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 58 states. [2018-12-03 16:44:54,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:54,879 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2018-12-03 16:44:54,879 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-03 16:44:54,879 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 44 [2018-12-03 16:44:54,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:54,879 INFO L225 Difference]: With dead ends: 77 [2018-12-03 16:44:54,880 INFO L226 Difference]: Without dead ends: 46 [2018-12-03 16:44:54,881 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 32 SyntacticMatches, 27 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2550 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1044, Invalid=4068, Unknown=0, NotChecked=0, Total=5112 [2018-12-03 16:44:54,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-12-03 16:44:54,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-12-03 16:44:54,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-12-03 16:44:54,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-12-03 16:44:54,887 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 44 [2018-12-03 16:44:54,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:54,887 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-12-03 16:44:54,888 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-12-03 16:44:54,888 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-12-03 16:44:54,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-12-03 16:44:54,888 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:54,888 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1] [2018-12-03 16:44:54,889 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:54,889 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:54,889 INFO L82 PathProgramCache]: Analyzing trace with hash 1306056857, now seen corresponding path program 26 times [2018-12-03 16:44:54,889 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:54,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:54,890 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:54,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:54,890 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:54,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:55,214 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 16:44:55,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:55,214 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:55,214 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:55,215 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:55,215 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:55,215 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:55,223 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:44:55,223 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:44:55,267 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-12-03 16:44:55,268 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:55,270 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:55,304 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 16:44:55,305 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:55,476 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 16:44:55,495 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:55,495 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 19 [2018-12-03 16:44:55,495 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:55,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 16:44:55,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 16:44:55,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=222, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:44:55,496 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 20 states. [2018-12-03 16:44:55,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:55,764 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2018-12-03 16:44:55,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 16:44:55,765 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2018-12-03 16:44:55,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:55,765 INFO L225 Difference]: With dead ends: 54 [2018-12-03 16:44:55,766 INFO L226 Difference]: Without dead ends: 52 [2018-12-03 16:44:55,767 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 73 SyntacticMatches, 28 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=444, Invalid=746, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 16:44:55,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-03 16:44:55,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 48. [2018-12-03 16:44:55,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-03 16:44:55,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-12-03 16:44:55,774 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 45 [2018-12-03 16:44:55,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:55,774 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-12-03 16:44:55,774 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 16:44:55,774 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-12-03 16:44:55,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-12-03 16:44:55,774 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:55,774 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1] [2018-12-03 16:44:55,775 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:55,775 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:55,775 INFO L82 PathProgramCache]: Analyzing trace with hash 990241459, now seen corresponding path program 27 times [2018-12-03 16:44:55,775 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:55,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:55,775 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:55,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:55,776 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:55,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:56,269 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 16:44:56,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:56,269 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:56,270 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:56,270 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:56,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:56,270 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:56,278 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:44:56,278 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:44:56,316 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:44:56,317 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:44:56,319 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:57,213 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 16:44:57,213 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:57,542 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 16:44:57,560 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:57,561 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-12-03 16:44:57,561 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:57,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-12-03 16:44:57,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-12-03 16:44:57,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=781, Invalid=3001, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 16:44:57,562 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 62 states. [2018-12-03 16:44:58,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:58,634 INFO L93 Difference]: Finished difference Result 82 states and 84 transitions. [2018-12-03 16:44:58,634 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-03 16:44:58,634 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 47 [2018-12-03 16:44:58,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:58,635 INFO L225 Difference]: With dead ends: 82 [2018-12-03 16:44:58,635 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 16:44:58,638 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 34 SyntacticMatches, 29 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2942 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1186, Invalid=4666, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 16:44:58,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 16:44:58,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-12-03 16:44:58,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 16:44:58,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-12-03 16:44:58,646 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 47 [2018-12-03 16:44:58,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:58,646 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-12-03 16:44:58,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-12-03 16:44:58,646 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-12-03 16:44:58,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 16:44:58,647 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:58,647 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1] [2018-12-03 16:44:58,647 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:58,647 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:58,647 INFO L82 PathProgramCache]: Analyzing trace with hash 924575388, now seen corresponding path program 28 times [2018-12-03 16:44:58,648 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:58,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:58,648 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:44:58,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:58,648 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:58,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:58,966 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 16:44:58,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:58,967 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:44:58,967 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:44:58,967 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:44:58,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:44:58,968 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:44:58,987 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:58,987 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:44:59,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:44:59,022 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:44:59,052 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 16:44:59,052 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:44:59,263 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 16:44:59,281 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:44:59,282 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 20 [2018-12-03 16:44:59,282 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:44:59,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 16:44:59,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 16:44:59,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=244, Unknown=0, NotChecked=0, Total=420 [2018-12-03 16:44:59,283 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 21 states. [2018-12-03 16:44:59,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:44:59,557 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2018-12-03 16:44:59,557 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 16:44:59,557 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 48 [2018-12-03 16:44:59,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:44:59,558 INFO L225 Difference]: With dead ends: 57 [2018-12-03 16:44:59,558 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 16:44:59,559 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 78 SyntacticMatches, 30 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 527 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=497, Invalid=835, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 16:44:59,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 16:44:59,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2018-12-03 16:44:59,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 16:44:59,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-12-03 16:44:59,568 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2018-12-03 16:44:59,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:44:59,568 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-12-03 16:44:59,568 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 16:44:59,568 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-12-03 16:44:59,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 16:44:59,568 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:44:59,568 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1] [2018-12-03 16:44:59,569 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:44:59,569 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:44:59,569 INFO L82 PathProgramCache]: Analyzing trace with hash -541230090, now seen corresponding path program 29 times [2018-12-03 16:44:59,569 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:44:59,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:59,570 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:44:59,570 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:44:59,570 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:44:59,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:00,158 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 16:45:00,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:00,159 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:00,159 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:00,159 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:00,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:00,159 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:00,169 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:45:00,169 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:45:00,217 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-12-03 16:45:00,217 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:45:00,219 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:01,046 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 16:45:01,047 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:01,371 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 16:45:01,389 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:01,389 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2018-12-03 16:45:01,389 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:01,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-12-03 16:45:01,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-12-03 16:45:01,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=881, Invalid=3409, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 16:45:01,391 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 66 states. [2018-12-03 16:45:02,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:02,012 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2018-12-03 16:45:02,013 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-12-03 16:45:02,013 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 50 [2018-12-03 16:45:02,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:02,013 INFO L225 Difference]: With dead ends: 87 [2018-12-03 16:45:02,014 INFO L226 Difference]: Without dead ends: 52 [2018-12-03 16:45:02,015 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 36 SyntacticMatches, 31 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3362 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1337, Invalid=5305, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 16:45:02,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-03 16:45:02,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-12-03 16:45:02,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-12-03 16:45:02,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2018-12-03 16:45:02,022 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 50 [2018-12-03 16:45:02,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:02,022 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2018-12-03 16:45:02,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-12-03 16:45:02,022 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2018-12-03 16:45:02,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-12-03 16:45:02,023 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:02,023 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1] [2018-12-03 16:45:02,023 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:02,023 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:02,023 INFO L82 PathProgramCache]: Analyzing trace with hash 1705935725, now seen corresponding path program 30 times [2018-12-03 16:45:02,023 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:02,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:02,024 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:45:02,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:02,024 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:02,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:02,268 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 16:45:02,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:02,268 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:02,268 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:02,269 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:02,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:02,269 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:02,277 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:45:02,277 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:45:02,338 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:45:02,338 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:45:02,341 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:02,410 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 16:45:02,410 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:02,631 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 16:45:02,649 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:02,649 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 21 [2018-12-03 16:45:02,649 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:02,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 16:45:02,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 16:45:02,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=267, Unknown=0, NotChecked=0, Total=462 [2018-12-03 16:45:02,650 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand 22 states. [2018-12-03 16:45:02,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:02,945 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2018-12-03 16:45:02,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 16:45:02,945 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2018-12-03 16:45:02,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:02,946 INFO L225 Difference]: With dead ends: 60 [2018-12-03 16:45:02,946 INFO L226 Difference]: Without dead ends: 58 [2018-12-03 16:45:02,946 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 83 SyntacticMatches, 32 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=553, Invalid=929, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 16:45:02,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-03 16:45:02,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 54. [2018-12-03 16:45:02,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-12-03 16:45:02,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-12-03 16:45:02,958 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 51 [2018-12-03 16:45:02,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:02,958 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-12-03 16:45:02,958 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 16:45:02,958 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-12-03 16:45:02,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-12-03 16:45:02,959 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:02,959 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1] [2018-12-03 16:45:02,959 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:02,959 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:02,959 INFO L82 PathProgramCache]: Analyzing trace with hash -1273223033, now seen corresponding path program 31 times [2018-12-03 16:45:02,960 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:02,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:02,960 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:45:02,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:02,960 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:02,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:03,488 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 16:45:03,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:03,488 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:03,488 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:03,488 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:03,489 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:03,489 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:03,498 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:45:03,499 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:45:03,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:03,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:04,478 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 16:45:04,478 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:04,845 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 16:45:04,864 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:04,864 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-12-03 16:45:04,864 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:04,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-12-03 16:45:04,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-12-03 16:45:04,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=987, Invalid=3843, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 16:45:04,865 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 70 states. [2018-12-03 16:45:05,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:05,888 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2018-12-03 16:45:05,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-12-03 16:45:05,888 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 53 [2018-12-03 16:45:05,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:05,889 INFO L225 Difference]: With dead ends: 92 [2018-12-03 16:45:05,889 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 16:45:05,890 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 38 SyntacticMatches, 33 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3810 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1497, Invalid=5985, Unknown=0, NotChecked=0, Total=7482 [2018-12-03 16:45:05,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 16:45:05,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-12-03 16:45:05,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-03 16:45:05,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2018-12-03 16:45:05,899 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 53 [2018-12-03 16:45:05,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:05,899 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2018-12-03 16:45:05,899 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-12-03 16:45:05,899 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2018-12-03 16:45:05,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 16:45:05,899 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:05,899 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1] [2018-12-03 16:45:05,900 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:05,900 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:05,900 INFO L82 PathProgramCache]: Analyzing trace with hash -1611671120, now seen corresponding path program 32 times [2018-12-03 16:45:05,900 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:05,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:05,901 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:45:05,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:05,901 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:05,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:06,199 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 16:45:06,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:06,199 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:06,199 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:06,199 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:06,200 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:06,200 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:06,209 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:45:06,209 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:45:06,262 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-12-03 16:45:06,262 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:45:06,264 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:06,307 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 16:45:06,307 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:06,575 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 16:45:06,593 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:06,593 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 22 [2018-12-03 16:45:06,593 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:06,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 16:45:06,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 16:45:06,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=291, Unknown=0, NotChecked=0, Total=506 [2018-12-03 16:45:06,594 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 23 states. [2018-12-03 16:45:07,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:07,077 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-12-03 16:45:07,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 16:45:07,078 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 54 [2018-12-03 16:45:07,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:07,079 INFO L225 Difference]: With dead ends: 63 [2018-12-03 16:45:07,079 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 16:45:07,080 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 88 SyntacticMatches, 34 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 665 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=612, Invalid=1028, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 16:45:07,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 16:45:07,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 57. [2018-12-03 16:45:07,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-03 16:45:07,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-12-03 16:45:07,088 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2018-12-03 16:45:07,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:07,089 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-12-03 16:45:07,089 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 16:45:07,089 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-12-03 16:45:07,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-12-03 16:45:07,089 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:07,089 INFO L402 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1] [2018-12-03 16:45:07,090 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:07,090 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:07,090 INFO L82 PathProgramCache]: Analyzing trace with hash 1667299850, now seen corresponding path program 33 times [2018-12-03 16:45:07,090 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:07,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:07,091 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:45:07,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:07,091 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:07,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:07,664 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 16:45:07,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:07,664 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:07,665 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:07,665 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:07,665 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:07,665 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:07,673 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:45:07,673 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:45:07,720 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:45:07,721 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:45:07,723 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:08,686 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 16:45:08,686 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:09,373 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 16:45:09,392 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:09,392 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-12-03 16:45:09,392 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:09,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-03 16:45:09,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-03 16:45:09,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1099, Invalid=4303, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 16:45:09,394 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 74 states. [2018-12-03 16:45:09,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:09,953 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2018-12-03 16:45:09,953 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-12-03 16:45:09,953 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 56 [2018-12-03 16:45:09,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:09,954 INFO L225 Difference]: With dead ends: 97 [2018-12-03 16:45:09,954 INFO L226 Difference]: Without dead ends: 58 [2018-12-03 16:45:09,955 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 40 SyntacticMatches, 35 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4286 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1666, Invalid=6706, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 16:45:09,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-03 16:45:09,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-12-03 16:45:09,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-12-03 16:45:09,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2018-12-03 16:45:09,967 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 56 [2018-12-03 16:45:09,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:09,967 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2018-12-03 16:45:09,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-03 16:45:09,967 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2018-12-03 16:45:09,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-12-03 16:45:09,968 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:09,968 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1] [2018-12-03 16:45:09,968 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:09,968 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:09,969 INFO L82 PathProgramCache]: Analyzing trace with hash -751416255, now seen corresponding path program 34 times [2018-12-03 16:45:09,969 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:09,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:09,969 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:45:09,970 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:09,970 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:09,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:10,661 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 16:45:10,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:10,662 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:10,662 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:10,662 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:10,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:10,662 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:10,671 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:45:10,671 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:45:10,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:10,717 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:10,751 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 16:45:10,751 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:11,050 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 16:45:11,068 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:11,068 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 23 [2018-12-03 16:45:11,068 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:11,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 16:45:11,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 16:45:11,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2018-12-03 16:45:11,069 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 24 states. [2018-12-03 16:45:11,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:11,407 INFO L93 Difference]: Finished difference Result 66 states and 67 transitions. [2018-12-03 16:45:11,408 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 16:45:11,408 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 57 [2018-12-03 16:45:11,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:11,409 INFO L225 Difference]: With dead ends: 66 [2018-12-03 16:45:11,409 INFO L226 Difference]: Without dead ends: 64 [2018-12-03 16:45:11,410 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 93 SyntacticMatches, 36 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 740 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=674, Invalid=1132, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 16:45:11,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-12-03 16:45:11,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 60. [2018-12-03 16:45:11,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-12-03 16:45:11,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-12-03 16:45:11,419 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 57 [2018-12-03 16:45:11,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:11,419 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-12-03 16:45:11,419 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 16:45:11,419 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-12-03 16:45:11,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-12-03 16:45:11,420 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:11,420 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1] [2018-12-03 16:45:11,420 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:11,420 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:11,420 INFO L82 PathProgramCache]: Analyzing trace with hash -556463013, now seen corresponding path program 35 times [2018-12-03 16:45:11,420 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:11,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:11,421 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:45:11,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:11,421 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:11,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:12,268 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 16:45:12,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:12,269 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:12,269 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:12,269 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:12,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:12,269 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:12,278 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:45:12,278 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:45:12,337 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-12-03 16:45:12,337 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:45:12,340 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:13,470 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 16:45:13,471 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:14,552 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 16:45:14,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:14,571 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2018-12-03 16:45:14,571 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:14,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-12-03 16:45:14,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-12-03 16:45:14,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1217, Invalid=4789, Unknown=0, NotChecked=0, Total=6006 [2018-12-03 16:45:14,573 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 78 states. [2018-12-03 16:45:15,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:15,972 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2018-12-03 16:45:15,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-12-03 16:45:15,972 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 59 [2018-12-03 16:45:15,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:15,973 INFO L225 Difference]: With dead ends: 102 [2018-12-03 16:45:15,973 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 16:45:15,974 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 42 SyntacticMatches, 37 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4790 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1844, Invalid=7468, Unknown=0, NotChecked=0, Total=9312 [2018-12-03 16:45:15,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 16:45:15,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-12-03 16:45:15,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-12-03 16:45:15,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2018-12-03 16:45:15,985 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 59 [2018-12-03 16:45:15,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:15,985 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2018-12-03 16:45:15,985 INFO L481 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-12-03 16:45:15,985 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2018-12-03 16:45:15,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-12-03 16:45:15,986 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:15,986 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1] [2018-12-03 16:45:15,986 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:15,986 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:15,986 INFO L82 PathProgramCache]: Analyzing trace with hash 138377924, now seen corresponding path program 36 times [2018-12-03 16:45:15,986 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:15,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:15,987 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:45:15,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:15,987 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:16,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:16,368 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 16:45:16,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:16,368 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:16,368 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:16,368 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:16,369 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:16,369 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:16,377 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:45:16,378 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:45:16,421 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:45:16,422 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:45:16,424 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:16,517 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 16:45:16,517 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:16,843 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 16:45:16,862 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:16,862 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 24 [2018-12-03 16:45:16,862 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:16,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-03 16:45:16,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-03 16:45:16,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=342, Unknown=0, NotChecked=0, Total=600 [2018-12-03 16:45:16,863 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 25 states. [2018-12-03 16:45:17,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:17,361 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-12-03 16:45:17,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 16:45:17,361 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 60 [2018-12-03 16:45:17,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:17,362 INFO L225 Difference]: With dead ends: 69 [2018-12-03 16:45:17,362 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 16:45:17,362 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 16:45:17,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 16:45:17,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 63. [2018-12-03 16:45:17,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 16:45:17,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-12-03 16:45:17,376 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 60 [2018-12-03 16:45:17,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:17,377 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-12-03 16:45:17,377 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-03 16:45:17,377 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-12-03 16:45:17,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 16:45:17,377 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:17,377 INFO L402 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1] [2018-12-03 16:45:17,377 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:17,377 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:17,377 INFO L82 PathProgramCache]: Analyzing trace with hash -162748898, now seen corresponding path program 37 times [2018-12-03 16:45:17,378 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:17,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:17,378 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:45:17,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:17,378 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:17,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:18,029 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 16:45:18,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:18,029 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:18,029 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:18,029 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:18,030 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:18,030 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:18,037 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:45:18,038 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:45:18,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:18,086 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:19,244 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 16:45:19,245 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:19,762 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 16:45:19,780 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:19,781 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-12-03 16:45:19,781 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:19,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 82 states [2018-12-03 16:45:19,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2018-12-03 16:45:19,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1341, Invalid=5301, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 16:45:19,782 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 82 states. [2018-12-03 16:45:20,199 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-12-03 16:45:21,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:21,309 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2018-12-03 16:45:21,309 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-12-03 16:45:21,309 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 62 [2018-12-03 16:45:21,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:21,310 INFO L225 Difference]: With dead ends: 107 [2018-12-03 16:45:21,310 INFO L226 Difference]: Without dead ends: 64 [2018-12-03 16:45:21,311 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 44 SyntacticMatches, 39 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5322 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2031, Invalid=8271, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 16:45:21,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-12-03 16:45:21,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2018-12-03 16:45:21,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-12-03 16:45:21,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2018-12-03 16:45:21,324 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 62 [2018-12-03 16:45:21,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:21,324 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2018-12-03 16:45:21,324 INFO L481 AbstractCegarLoop]: Interpolant automaton has 82 states. [2018-12-03 16:45:21,324 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2018-12-03 16:45:21,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-12-03 16:45:21,324 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:21,324 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1] [2018-12-03 16:45:21,325 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:21,325 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:21,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1898761451, now seen corresponding path program 38 times [2018-12-03 16:45:21,325 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:21,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:21,325 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:45:21,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:21,326 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:21,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:21,654 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 16:45:21,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:21,654 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:21,654 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:21,655 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:21,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:21,655 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:21,672 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:45:21,673 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:45:21,741 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-12-03 16:45:21,741 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:45:21,744 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:21,781 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 16:45:21,781 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:22,500 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 16:45:22,519 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:22,519 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 25 [2018-12-03 16:45:22,519 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:22,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 16:45:22,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 16:45:22,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=369, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:45:22,520 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand 26 states. [2018-12-03 16:45:22,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:22,895 INFO L93 Difference]: Finished difference Result 72 states and 73 transitions. [2018-12-03 16:45:22,896 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 16:45:22,896 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 63 [2018-12-03 16:45:22,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:22,896 INFO L225 Difference]: With dead ends: 72 [2018-12-03 16:45:22,896 INFO L226 Difference]: Without dead ends: 70 [2018-12-03 16:45:22,897 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 103 SyntacticMatches, 40 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 902 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=807, Invalid=1355, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 16:45:22,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-12-03 16:45:22,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2018-12-03 16:45:22,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-03 16:45:22,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-12-03 16:45:22,910 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 63 [2018-12-03 16:45:22,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:22,910 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-12-03 16:45:22,911 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 16:45:22,911 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-12-03 16:45:22,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-12-03 16:45:22,911 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:22,911 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1] [2018-12-03 16:45:22,911 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:22,911 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:22,911 INFO L82 PathProgramCache]: Analyzing trace with hash 651398703, now seen corresponding path program 39 times [2018-12-03 16:45:22,912 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:22,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:22,912 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:45:22,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:22,912 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:22,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:23,783 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 16:45:23,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:23,784 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:23,784 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:23,784 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:23,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:23,784 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:23,793 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:45:23,793 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:45:23,841 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:45:23,841 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:45:23,844 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:25,106 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 16:45:25,106 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:25,718 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 16:45:25,737 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:25,737 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-12-03 16:45:25,737 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:25,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-03 16:45:25,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-03 16:45:25,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1471, Invalid=5839, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 16:45:25,739 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 86 states. [2018-12-03 16:45:26,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:26,965 INFO L93 Difference]: Finished difference Result 112 states and 114 transitions. [2018-12-03 16:45:26,965 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 16:45:26,965 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 65 [2018-12-03 16:45:26,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:26,966 INFO L225 Difference]: With dead ends: 112 [2018-12-03 16:45:26,966 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 16:45:26,967 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 46 SyntacticMatches, 41 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5882 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2227, Invalid=9115, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 16:45:26,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 16:45:26,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-12-03 16:45:26,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-12-03 16:45:26,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-12-03 16:45:26,978 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 65 [2018-12-03 16:45:26,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:26,978 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-12-03 16:45:26,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-03 16:45:26,979 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-12-03 16:45:26,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-12-03 16:45:26,979 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:26,979 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1] [2018-12-03 16:45:26,979 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:26,979 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:26,979 INFO L82 PathProgramCache]: Analyzing trace with hash -1197356584, now seen corresponding path program 40 times [2018-12-03 16:45:26,979 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:26,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:26,980 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:45:26,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:26,980 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:26,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:27,511 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 16:45:27,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:27,512 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:27,512 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:27,512 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:27,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:27,512 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:27,521 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:45:27,521 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:45:27,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:27,573 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:27,637 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 16:45:27,637 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:28,067 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 16:45:28,086 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:28,086 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 26 [2018-12-03 16:45:28,086 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:28,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 16:45:28,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 16:45:28,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=397, Unknown=0, NotChecked=0, Total=702 [2018-12-03 16:45:28,087 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 27 states. [2018-12-03 16:45:28,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:28,508 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2018-12-03 16:45:28,508 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 16:45:28,508 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 66 [2018-12-03 16:45:28,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:28,509 INFO L225 Difference]: With dead ends: 75 [2018-12-03 16:45:28,509 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 16:45:28,510 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 108 SyntacticMatches, 42 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 989 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=878, Invalid=1474, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 16:45:28,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 16:45:28,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 69. [2018-12-03 16:45:28,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-03 16:45:28,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-12-03 16:45:28,527 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 66 [2018-12-03 16:45:28,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:28,527 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-12-03 16:45:28,527 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 16:45:28,528 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-12-03 16:45:28,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-12-03 16:45:28,528 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:28,528 INFO L402 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1] [2018-12-03 16:45:28,528 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:28,529 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:28,529 INFO L82 PathProgramCache]: Analyzing trace with hash 391610418, now seen corresponding path program 41 times [2018-12-03 16:45:28,529 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:28,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:28,530 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:45:28,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:28,530 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:28,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:29,414 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 16:45:29,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:29,414 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:29,415 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:29,415 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:29,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:29,415 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:29,423 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:45:29,423 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:45:29,489 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-12-03 16:45:29,489 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:45:29,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:30,872 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 16:45:30,872 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:31,460 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 16:45:31,478 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:31,479 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 89 [2018-12-03 16:45:31,479 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:31,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-12-03 16:45:31,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-12-03 16:45:31,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1607, Invalid=6403, Unknown=0, NotChecked=0, Total=8010 [2018-12-03 16:45:31,480 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 90 states. [2018-12-03 16:45:33,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:33,455 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2018-12-03 16:45:33,455 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-12-03 16:45:33,455 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 68 [2018-12-03 16:45:33,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:33,455 INFO L225 Difference]: With dead ends: 117 [2018-12-03 16:45:33,455 INFO L226 Difference]: Without dead ends: 70 [2018-12-03 16:45:33,456 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 48 SyntacticMatches, 43 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6470 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2432, Invalid=10000, Unknown=0, NotChecked=0, Total=12432 [2018-12-03 16:45:33,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-12-03 16:45:33,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-12-03 16:45:33,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-12-03 16:45:33,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2018-12-03 16:45:33,469 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 68 [2018-12-03 16:45:33,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:33,469 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2018-12-03 16:45:33,469 INFO L481 AbstractCegarLoop]: Interpolant automaton has 90 states. [2018-12-03 16:45:33,469 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2018-12-03 16:45:33,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-12-03 16:45:33,470 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:33,470 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1] [2018-12-03 16:45:33,470 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:33,470 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:33,470 INFO L82 PathProgramCache]: Analyzing trace with hash -1511507991, now seen corresponding path program 42 times [2018-12-03 16:45:33,470 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:33,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:33,471 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:45:33,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:33,471 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:33,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:33,871 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 16:45:33,871 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:33,871 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:33,871 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:33,871 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:33,871 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:33,872 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:33,881 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:45:33,881 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:45:33,935 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:45:33,936 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:45:33,939 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:33,967 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 16:45:33,967 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:34,476 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 16:45:34,495 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:34,496 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 27 [2018-12-03 16:45:34,496 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:34,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-12-03 16:45:34,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-12-03 16:45:34,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=330, Invalid=426, Unknown=0, NotChecked=0, Total=756 [2018-12-03 16:45:34,496 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand 28 states. [2018-12-03 16:45:34,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:34,950 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2018-12-03 16:45:34,950 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-12-03 16:45:34,951 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 69 [2018-12-03 16:45:34,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:34,951 INFO L225 Difference]: With dead ends: 78 [2018-12-03 16:45:34,951 INFO L226 Difference]: Without dead ends: 76 [2018-12-03 16:45:34,952 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 16:45:34,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-12-03 16:45:34,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 72. [2018-12-03 16:45:34,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-12-03 16:45:34,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-12-03 16:45:34,967 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 69 [2018-12-03 16:45:34,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:34,967 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-12-03 16:45:34,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-12-03 16:45:34,967 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-12-03 16:45:34,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-12-03 16:45:34,968 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:34,968 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1] [2018-12-03 16:45:34,968 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:34,968 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:34,968 INFO L82 PathProgramCache]: Analyzing trace with hash -860180989, now seen corresponding path program 43 times [2018-12-03 16:45:34,968 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:34,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:34,969 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:45:34,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:34,969 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:34,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:35,821 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 16:45:35,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:35,821 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:35,821 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:35,821 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:35,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:35,821 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:35,829 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:45:35,830 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:45:35,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:35,890 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:37,677 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 16:45:37,677 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:38,345 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 16:45:38,363 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:38,363 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-12-03 16:45:38,364 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:38,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 94 states [2018-12-03 16:45:38,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2018-12-03 16:45:38,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1749, Invalid=6993, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 16:45:38,365 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 94 states. [2018-12-03 16:45:39,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:39,256 INFO L93 Difference]: Finished difference Result 122 states and 124 transitions. [2018-12-03 16:45:39,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-03 16:45:39,257 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 71 [2018-12-03 16:45:39,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:39,257 INFO L225 Difference]: With dead ends: 122 [2018-12-03 16:45:39,257 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 16:45:39,258 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 50 SyntacticMatches, 45 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7086 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2646, Invalid=10926, Unknown=0, NotChecked=0, Total=13572 [2018-12-03 16:45:39,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 16:45:39,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2018-12-03 16:45:39,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 16:45:39,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2018-12-03 16:45:39,271 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 71 [2018-12-03 16:45:39,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:39,271 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2018-12-03 16:45:39,271 INFO L481 AbstractCegarLoop]: Interpolant automaton has 94 states. [2018-12-03 16:45:39,271 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2018-12-03 16:45:39,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 16:45:39,272 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:39,272 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1] [2018-12-03 16:45:39,272 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:39,272 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:39,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1202570988, now seen corresponding path program 44 times [2018-12-03 16:45:39,272 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:39,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:39,273 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:45:39,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:39,273 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:39,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:39,815 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 16:45:39,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:39,815 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:39,815 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:39,815 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:39,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:39,816 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:39,825 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:45:39,826 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:45:39,904 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-12-03 16:45:39,905 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:45:39,907 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:40,029 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 16:45:40,029 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:40,455 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 16:45:40,475 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:40,475 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 28 [2018-12-03 16:45:40,475 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:40,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 16:45:40,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 16:45:40,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=456, Unknown=0, NotChecked=0, Total=812 [2018-12-03 16:45:40,476 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand 29 states. [2018-12-03 16:45:40,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:40,931 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2018-12-03 16:45:40,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 16:45:40,931 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2018-12-03 16:45:40,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:40,932 INFO L225 Difference]: With dead ends: 81 [2018-12-03 16:45:40,932 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 16:45:40,933 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 16:45:40,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 16:45:40,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 75. [2018-12-03 16:45:40,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-03 16:45:40,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-12-03 16:45:40,949 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 72 [2018-12-03 16:45:40,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:40,949 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-12-03 16:45:40,949 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 16:45:40,949 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-12-03 16:45:40,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-12-03 16:45:40,950 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:40,950 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1] [2018-12-03 16:45:40,950 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:40,950 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:40,950 INFO L82 PathProgramCache]: Analyzing trace with hash 324569158, now seen corresponding path program 45 times [2018-12-03 16:45:40,950 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:40,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:40,951 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:45:40,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:40,951 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:40,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:41,868 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 16:45:41,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:41,868 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:41,868 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:41,868 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:41,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:41,868 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:41,877 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:45:41,877 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:45:41,933 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:45:41,933 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:45:41,938 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:44,554 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 16:45:44,554 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:45,381 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 16:45:45,399 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:45,399 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-12-03 16:45:45,400 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:45,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2018-12-03 16:45:45,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2018-12-03 16:45:45,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1897, Invalid=7609, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 16:45:45,401 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 98 states. [2018-12-03 16:45:47,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:47,868 INFO L93 Difference]: Finished difference Result 127 states and 129 transitions. [2018-12-03 16:45:47,868 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-03 16:45:47,868 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 74 [2018-12-03 16:45:47,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:47,869 INFO L225 Difference]: With dead ends: 127 [2018-12-03 16:45:47,869 INFO L226 Difference]: Without dead ends: 76 [2018-12-03 16:45:47,870 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 52 SyntacticMatches, 47 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7730 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=2869, Invalid=11893, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 16:45:47,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-12-03 16:45:47,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2018-12-03 16:45:47,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-12-03 16:45:47,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2018-12-03 16:45:47,884 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 74 [2018-12-03 16:45:47,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:47,884 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2018-12-03 16:45:47,884 INFO L481 AbstractCegarLoop]: Interpolant automaton has 98 states. [2018-12-03 16:45:47,884 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2018-12-03 16:45:47,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-12-03 16:45:47,884 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:47,884 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1] [2018-12-03 16:45:47,884 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:47,885 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:47,885 INFO L82 PathProgramCache]: Analyzing trace with hash -623355203, now seen corresponding path program 46 times [2018-12-03 16:45:47,885 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:47,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:47,886 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:45:47,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:47,886 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:47,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:48,356 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 16:45:48,357 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:48,357 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:48,357 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:48,357 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:48,357 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:48,357 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:48,365 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:45:48,366 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:45:48,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:48,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:48,461 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 16:45:48,461 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:48,893 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 16:45:48,913 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:48,913 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 29 [2018-12-03 16:45:48,913 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:48,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-12-03 16:45:48,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-12-03 16:45:48,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=487, Unknown=0, NotChecked=0, Total=870 [2018-12-03 16:45:48,914 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand 30 states. [2018-12-03 16:45:49,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:49,367 INFO L93 Difference]: Finished difference Result 84 states and 85 transitions. [2018-12-03 16:45:49,367 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 16:45:49,368 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 75 [2018-12-03 16:45:49,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:49,369 INFO L225 Difference]: With dead ends: 84 [2018-12-03 16:45:49,369 INFO L226 Difference]: Without dead ends: 82 [2018-12-03 16:45:49,369 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 123 SyntacticMatches, 48 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1274 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1109, Invalid=1861, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 16:45:49,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-12-03 16:45:49,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 78. [2018-12-03 16:45:49,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-12-03 16:45:49,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-12-03 16:45:49,386 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 75 [2018-12-03 16:45:49,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:49,386 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-12-03 16:45:49,386 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-12-03 16:45:49,386 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-12-03 16:45:49,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-12-03 16:45:49,386 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:49,386 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1] [2018-12-03 16:45:49,387 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:49,387 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:49,387 INFO L82 PathProgramCache]: Analyzing trace with hash -2043843625, now seen corresponding path program 47 times [2018-12-03 16:45:49,387 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:49,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:49,387 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:45:49,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:49,388 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:49,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:50,558 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 16:45:50,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:50,558 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:50,558 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:50,558 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:50,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:50,558 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:50,566 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:45:50,566 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:45:50,645 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-12-03 16:45:50,645 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:45:50,648 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:52,468 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 16:45:52,468 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:53,578 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 16:45:53,598 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:53,598 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 101 [2018-12-03 16:45:53,598 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:53,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2018-12-03 16:45:53,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2018-12-03 16:45:53,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2051, Invalid=8251, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 16:45:53,600 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 102 states. [2018-12-03 16:45:55,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:55,156 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2018-12-03 16:45:55,156 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-12-03 16:45:55,156 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 77 [2018-12-03 16:45:55,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:55,157 INFO L225 Difference]: With dead ends: 132 [2018-12-03 16:45:55,157 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 16:45:55,158 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 54 SyntacticMatches, 49 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8402 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3101, Invalid=12901, Unknown=0, NotChecked=0, Total=16002 [2018-12-03 16:45:55,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 16:45:55,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-12-03 16:45:55,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-12-03 16:45:55,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-12-03 16:45:55,174 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 77 [2018-12-03 16:45:55,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:55,175 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-12-03 16:45:55,175 INFO L481 AbstractCegarLoop]: Interpolant automaton has 102 states. [2018-12-03 16:45:55,175 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-12-03 16:45:55,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-12-03 16:45:55,175 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:55,176 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1] [2018-12-03 16:45:55,176 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:55,176 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:55,176 INFO L82 PathProgramCache]: Analyzing trace with hash 2046456320, now seen corresponding path program 48 times [2018-12-03 16:45:55,176 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:55,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:55,177 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:45:55,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:55,177 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:55,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:56,263 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 16:45:56,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:56,264 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:56,264 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:56,264 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:56,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:56,264 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:56,274 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:45:56,275 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:45:56,339 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:45:56,339 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:45:56,342 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:45:56,384 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 16:45:56,384 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:45:56,981 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 16:45:57,001 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:45:57,001 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 30 [2018-12-03 16:45:57,001 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:45:57,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-12-03 16:45:57,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-12-03 16:45:57,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=411, Invalid=519, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:45:57,003 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 31 states. [2018-12-03 16:45:57,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:45:57,524 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2018-12-03 16:45:57,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 16:45:57,524 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 78 [2018-12-03 16:45:57,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:45:57,525 INFO L225 Difference]: With dead ends: 87 [2018-12-03 16:45:57,525 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 16:45:57,525 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 128 SyntacticMatches, 50 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1377 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1192, Invalid=2000, Unknown=0, NotChecked=0, Total=3192 [2018-12-03 16:45:57,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 16:45:57,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 81. [2018-12-03 16:45:57,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-03 16:45:57,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2018-12-03 16:45:57,546 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 78 [2018-12-03 16:45:57,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:45:57,546 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2018-12-03 16:45:57,546 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-12-03 16:45:57,546 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2018-12-03 16:45:57,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-12-03 16:45:57,547 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:45:57,547 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1] [2018-12-03 16:45:57,547 INFO L423 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:45:57,547 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:45:57,548 INFO L82 PathProgramCache]: Analyzing trace with hash -450445734, now seen corresponding path program 49 times [2018-12-03 16:45:57,548 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:45:57,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:57,549 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:45:57,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:45:57,549 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:45:57,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:59,378 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 16:45:59,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:59,378 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:45:59,378 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:45:59,378 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:45:59,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:45:59,379 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:45:59,388 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:45:59,388 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:45:59,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:45:59,453 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:01,324 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 16:46:01,324 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:02,280 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 16:46:02,298 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:02,299 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-12-03 16:46:02,299 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:02,299 INFO L459 AbstractCegarLoop]: Interpolant automaton has 106 states [2018-12-03 16:46:02,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2018-12-03 16:46:02,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=8919, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 16:46:02,300 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand 106 states. [2018-12-03 16:46:05,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:05,014 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2018-12-03 16:46:05,014 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 16:46:05,014 INFO L78 Accepts]: Start accepts. Automaton has 106 states. Word has length 80 [2018-12-03 16:46:05,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:05,015 INFO L225 Difference]: With dead ends: 137 [2018-12-03 16:46:05,015 INFO L226 Difference]: Without dead ends: 82 [2018-12-03 16:46:05,016 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 56 SyntacticMatches, 51 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9102 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=3342, Invalid=13950, Unknown=0, NotChecked=0, Total=17292 [2018-12-03 16:46:05,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-12-03 16:46:05,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2018-12-03 16:46:05,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-12-03 16:46:05,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-12-03 16:46:05,035 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 80 [2018-12-03 16:46:05,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:05,035 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-12-03 16:46:05,035 INFO L481 AbstractCegarLoop]: Interpolant automaton has 106 states. [2018-12-03 16:46:05,035 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-12-03 16:46:05,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-12-03 16:46:05,036 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:05,036 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1] [2018-12-03 16:46:05,036 INFO L423 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:05,036 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:05,036 INFO L82 PathProgramCache]: Analyzing trace with hash 1158060945, now seen corresponding path program 50 times [2018-12-03 16:46:05,036 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:05,037 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:05,037 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:05,037 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:05,037 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:05,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:05,586 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 16:46:05,586 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:05,586 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:05,587 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:05,587 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:05,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:05,587 INFO 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 16:46:05,605 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:46:05,605 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:46:05,745 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2018-12-03 16:46:05,745 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:05,748 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:05,791 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 16:46:05,791 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:06,311 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 16:46:06,329 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:06,330 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 31 [2018-12-03 16:46:06,330 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:06,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 16:46:06,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 16:46:06,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=440, Invalid=552, Unknown=0, NotChecked=0, Total=992 [2018-12-03 16:46:06,331 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 32 states. [2018-12-03 16:46:07,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:07,559 INFO L93 Difference]: Finished difference Result 90 states and 91 transitions. [2018-12-03 16:46:07,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 16:46:07,559 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 81 [2018-12-03 16:46:07,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:07,560 INFO L225 Difference]: With dead ends: 90 [2018-12-03 16:46:07,561 INFO L226 Difference]: Without dead ends: 88 [2018-12-03 16:46:07,561 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 16:46:07,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-12-03 16:46:07,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2018-12-03 16:46:07,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-12-03 16:46:07,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2018-12-03 16:46:07,578 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 81 [2018-12-03 16:46:07,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:07,579 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2018-12-03 16:46:07,579 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 16:46:07,579 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2018-12-03 16:46:07,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-12-03 16:46:07,579 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:07,579 INFO L402 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1] [2018-12-03 16:46:07,579 INFO L423 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:07,580 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:07,580 INFO L82 PathProgramCache]: Analyzing trace with hash 500090795, now seen corresponding path program 51 times [2018-12-03 16:46:07,580 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:07,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:07,580 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:07,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:07,581 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:07,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:09,758 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 16:46:09,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:09,758 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:09,759 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:09,759 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:09,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:09,759 INFO 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 16:46:09,769 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:46:09,769 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:46:09,835 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:46:09,835 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:09,841 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:12,080 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 16:46:12,080 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:12,981 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 16:46:13,000 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:13,000 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 109 [2018-12-03 16:46:13,000 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:13,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2018-12-03 16:46:13,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2018-12-03 16:46:13,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2377, Invalid=9613, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 16:46:13,001 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand 110 states. [2018-12-03 16:46:15,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:15,350 INFO L93 Difference]: Finished difference Result 142 states and 144 transitions. [2018-12-03 16:46:15,350 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-12-03 16:46:15,350 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 83 [2018-12-03 16:46:15,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:15,351 INFO L225 Difference]: With dead ends: 142 [2018-12-03 16:46:15,351 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 16:46:15,352 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 58 SyntacticMatches, 53 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9830 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=3592, Invalid=15040, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 16:46:15,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 16:46:15,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2018-12-03 16:46:15,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-12-03 16:46:15,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2018-12-03 16:46:15,369 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 83 [2018-12-03 16:46:15,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:15,369 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2018-12-03 16:46:15,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has 110 states. [2018-12-03 16:46:15,369 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2018-12-03 16:46:15,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-12-03 16:46:15,370 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:15,370 INFO L402 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1] [2018-12-03 16:46:15,370 INFO L423 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:15,370 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:15,370 INFO L82 PathProgramCache]: Analyzing trace with hash 572443412, now seen corresponding path program 52 times [2018-12-03 16:46:15,370 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:15,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:15,371 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:15,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:15,371 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:15,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:16,227 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 16:46:16,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:16,227 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:16,227 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:16,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:16,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:16,228 INFO 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 16:46:16,235 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:16,236 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:46:16,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:16,304 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:16,403 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 16:46:16,403 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:17,036 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 16:46:17,055 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:17,055 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 32 [2018-12-03 16:46:17,056 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:17,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-12-03 16:46:17,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-12-03 16:46:17,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=586, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 16:46:17,056 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand 33 states. [2018-12-03 16:46:17,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:17,608 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2018-12-03 16:46:17,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 16:46:17,608 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 84 [2018-12-03 16:46:17,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:17,609 INFO L225 Difference]: With dead ends: 93 [2018-12-03 16:46:17,609 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 16:46:17,610 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 138 SyntacticMatches, 54 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1595 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1367, Invalid=2293, Unknown=0, NotChecked=0, Total=3660 [2018-12-03 16:46:17,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 16:46:17,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 87. [2018-12-03 16:46:17,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 16:46:17,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-12-03 16:46:17,630 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 84 [2018-12-03 16:46:17,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:17,630 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-12-03 16:46:17,630 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-12-03 16:46:17,630 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-12-03 16:46:17,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 16:46:17,630 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:17,631 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1] [2018-12-03 16:46:17,631 INFO L423 AbstractCegarLoop]: === Iteration 55 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:17,631 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:17,631 INFO L82 PathProgramCache]: Analyzing trace with hash 362357358, now seen corresponding path program 53 times [2018-12-03 16:46:17,631 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:17,632 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:17,632 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:17,632 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:17,632 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:17,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:19,058 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 16:46:19,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:19,058 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:19,058 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:19,059 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:19,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:19,059 INFO 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 16:46:19,068 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:46:19,069 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:46:19,167 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-12-03 16:46:19,167 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:19,171 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:21,311 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 16:46:21,311 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:22,252 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 16:46:22,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:22,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 113 [2018-12-03 16:46:22,271 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:22,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 114 states [2018-12-03 16:46:22,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2018-12-03 16:46:22,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2549, Invalid=10333, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 16:46:22,273 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 114 states. [2018-12-03 16:46:24,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:24,822 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-12-03 16:46:24,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-12-03 16:46:24,822 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 86 [2018-12-03 16:46:24,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:24,823 INFO L225 Difference]: With dead ends: 147 [2018-12-03 16:46:24,823 INFO L226 Difference]: Without dead ends: 88 [2018-12-03 16:46:24,824 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 60 SyntacticMatches, 55 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10586 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=3851, Invalid=16171, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 16:46:24,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-12-03 16:46:24,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-12-03 16:46:24,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-12-03 16:46:24,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2018-12-03 16:46:24,847 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 86 [2018-12-03 16:46:24,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:24,847 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2018-12-03 16:46:24,847 INFO L481 AbstractCegarLoop]: Interpolant automaton has 114 states. [2018-12-03 16:46:24,847 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2018-12-03 16:46:24,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-12-03 16:46:24,848 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:24,848 INFO L402 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1] [2018-12-03 16:46:24,848 INFO L423 AbstractCegarLoop]: === Iteration 56 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:24,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:24,848 INFO L82 PathProgramCache]: Analyzing trace with hash -254412187, now seen corresponding path program 54 times [2018-12-03 16:46:24,848 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:24,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:24,849 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:24,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:24,849 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:24,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:25,348 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 16:46:25,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:25,349 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:25,349 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:25,349 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:25,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:25,349 INFO 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 16:46:25,357 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:46:25,358 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:46:25,423 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:46:25,423 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:25,426 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:25,460 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 16:46:25,460 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:26,035 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 16:46:26,054 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:26,054 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 33 [2018-12-03 16:46:26,054 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:26,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-12-03 16:46:26,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-12-03 16:46:26,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=621, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 16:46:26,055 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand 34 states. [2018-12-03 16:46:26,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:26,629 INFO L93 Difference]: Finished difference Result 96 states and 97 transitions. [2018-12-03 16:46:26,629 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-12-03 16:46:26,629 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 87 [2018-12-03 16:46:26,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:26,630 INFO L225 Difference]: With dead ends: 96 [2018-12-03 16:46:26,631 INFO L226 Difference]: Without dead ends: 94 [2018-12-03 16:46:26,631 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 143 SyntacticMatches, 56 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1710 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1459, Invalid=2447, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 16:46:26,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-03 16:46:26,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 90. [2018-12-03 16:46:26,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-12-03 16:46:26,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2018-12-03 16:46:26,661 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 87 [2018-12-03 16:46:26,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:26,661 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2018-12-03 16:46:26,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-12-03 16:46:26,661 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2018-12-03 16:46:26,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-12-03 16:46:26,662 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:26,662 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1] [2018-12-03 16:46:26,662 INFO L423 AbstractCegarLoop]: === Iteration 57 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:26,662 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:26,662 INFO L82 PathProgramCache]: Analyzing trace with hash 323076479, now seen corresponding path program 55 times [2018-12-03 16:46:26,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:26,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:26,663 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:26,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:26,663 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:26,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:28,179 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 16:46:28,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:28,180 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:28,180 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:28,180 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:28,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:28,180 INFO 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 16:46:28,189 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:28,190 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:46:28,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:28,262 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:30,857 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 16:46:30,858 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:31,894 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 16:46:31,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:31,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 117 [2018-12-03 16:46:31,912 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:31,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 118 states [2018-12-03 16:46:31,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2018-12-03 16:46:31,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2727, Invalid=11079, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 16:46:31,914 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand 118 states. [2018-12-03 16:46:35,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:35,171 INFO L93 Difference]: Finished difference Result 152 states and 154 transitions. [2018-12-03 16:46:35,171 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-12-03 16:46:35,171 INFO L78 Accepts]: Start accepts. Automaton has 118 states. Word has length 89 [2018-12-03 16:46:35,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:35,172 INFO L225 Difference]: With dead ends: 152 [2018-12-03 16:46:35,172 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 16:46:35,173 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 62 SyntacticMatches, 57 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11370 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=4119, Invalid=17343, Unknown=0, NotChecked=0, Total=21462 [2018-12-03 16:46:35,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 16:46:35,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-12-03 16:46:35,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-12-03 16:46:35,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2018-12-03 16:46:35,200 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 89 [2018-12-03 16:46:35,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:35,200 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2018-12-03 16:46:35,200 INFO L481 AbstractCegarLoop]: Interpolant automaton has 118 states. [2018-12-03 16:46:35,200 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2018-12-03 16:46:35,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-12-03 16:46:35,201 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:35,201 INFO L402 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1] [2018-12-03 16:46:35,201 INFO L423 AbstractCegarLoop]: === Iteration 58 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:35,201 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:35,201 INFO L82 PathProgramCache]: Analyzing trace with hash 11653672, now seen corresponding path program 56 times [2018-12-03 16:46:35,201 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:35,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:35,202 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:35,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:35,202 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:35,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:35,657 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 16:46:35,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:35,657 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:35,658 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:35,658 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:35,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:35,658 INFO 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 16:46:35,667 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:46:35,668 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:46:35,796 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-12-03 16:46:35,796 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:35,799 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:35,842 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 16:46:35,842 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:36,638 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 16:46:36,657 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:36,657 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 34 [2018-12-03 16:46:36,657 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:36,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 16:46:36,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 16:46:36,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=533, Invalid=657, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 16:46:36,658 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand 35 states. [2018-12-03 16:46:37,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:37,272 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-12-03 16:46:37,272 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 16:46:37,272 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 90 [2018-12-03 16:46:37,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:37,273 INFO L225 Difference]: With dead ends: 99 [2018-12-03 16:46:37,274 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 16:46:37,274 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 148 SyntacticMatches, 58 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1829 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1554, Invalid=2606, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 16:46:37,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 16:46:37,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 93. [2018-12-03 16:46:37,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-03 16:46:37,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2018-12-03 16:46:37,301 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 90 [2018-12-03 16:46:37,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:37,301 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2018-12-03 16:46:37,301 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 16:46:37,301 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2018-12-03 16:46:37,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-12-03 16:46:37,302 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:37,302 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1] [2018-12-03 16:46:37,302 INFO L423 AbstractCegarLoop]: === Iteration 59 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:37,302 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:37,303 INFO L82 PathProgramCache]: Analyzing trace with hash -1685670782, now seen corresponding path program 57 times [2018-12-03 16:46:37,303 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:37,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:37,303 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:37,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:37,304 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:37,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:38,562 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 16:46:38,562 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:38,562 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:38,563 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:38,563 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:38,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:38,563 INFO 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 16:46:38,572 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:46:38,572 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:46:38,646 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:46:38,646 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:38,650 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:41,377 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 16:46:41,377 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:42,535 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 16:46:42,553 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:42,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 121 [2018-12-03 16:46:42,554 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:42,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2018-12-03 16:46:42,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2018-12-03 16:46:42,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2911, Invalid=11851, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 16:46:42,555 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand 122 states. [2018-12-03 16:46:43,095 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-12-03 16:46:45,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:45,536 INFO L93 Difference]: Finished difference Result 157 states and 159 transitions. [2018-12-03 16:46:45,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-03 16:46:45,536 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 92 [2018-12-03 16:46:45,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:45,537 INFO L225 Difference]: With dead ends: 157 [2018-12-03 16:46:45,537 INFO L226 Difference]: Without dead ends: 94 [2018-12-03 16:46:45,538 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 64 SyntacticMatches, 59 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12182 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=4396, Invalid=18556, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 16:46:45,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-03 16:46:45,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2018-12-03 16:46:45,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-12-03 16:46:45,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-12-03 16:46:45,558 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 92 [2018-12-03 16:46:45,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:45,558 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-12-03 16:46:45,558 INFO L481 AbstractCegarLoop]: Interpolant automaton has 122 states. [2018-12-03 16:46:45,559 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-12-03 16:46:45,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-12-03 16:46:45,559 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:45,559 INFO L402 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1] [2018-12-03 16:46:45,559 INFO L423 AbstractCegarLoop]: === Iteration 60 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:45,559 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:45,559 INFO L82 PathProgramCache]: Analyzing trace with hash 2141812537, now seen corresponding path program 58 times [2018-12-03 16:46:45,560 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:45,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:45,560 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:45,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:45,560 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:45,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:46,025 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 16:46:46,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:46,026 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:46,026 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:46,026 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:46,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:46,026 INFO 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 16:46:46,037 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:46,037 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:46:46,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:46,112 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:46,171 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 16:46:46,171 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:46,842 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 16:46:46,860 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:46,860 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 35 [2018-12-03 16:46:46,861 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:46,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-12-03 16:46:46,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-12-03 16:46:46,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=566, Invalid=694, Unknown=0, NotChecked=0, Total=1260 [2018-12-03 16:46:46,861 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 36 states. [2018-12-03 16:46:47,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:47,521 INFO L93 Difference]: Finished difference Result 102 states and 103 transitions. [2018-12-03 16:46:47,522 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 16:46:47,522 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 93 [2018-12-03 16:46:47,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:47,522 INFO L225 Difference]: With dead ends: 102 [2018-12-03 16:46:47,522 INFO L226 Difference]: Without dead ends: 100 [2018-12-03 16:46:47,523 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 153 SyntacticMatches, 60 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1952 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1652, Invalid=2770, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 16:46:47,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-12-03 16:46:47,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 96. [2018-12-03 16:46:47,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-12-03 16:46:47,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2018-12-03 16:46:47,546 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 93 [2018-12-03 16:46:47,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:47,547 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2018-12-03 16:46:47,547 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-12-03 16:46:47,547 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2018-12-03 16:46:47,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-12-03 16:46:47,547 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:47,547 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1] [2018-12-03 16:46:47,547 INFO L423 AbstractCegarLoop]: === Iteration 61 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:47,547 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:47,548 INFO L82 PathProgramCache]: Analyzing trace with hash 992565587, now seen corresponding path program 59 times [2018-12-03 16:46:47,548 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:47,548 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:47,548 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:46:47,548 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:47,549 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:47,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:48,939 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 16:46:48,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:48,940 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:48,940 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:48,940 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:48,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:48,940 INFO 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 16:46:48,949 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:46:48,949 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:46:49,059 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2018-12-03 16:46:49,059 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:49,063 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:52,532 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 16:46:52,532 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:53,694 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 16:46:53,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:53,729 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 125 [2018-12-03 16:46:53,729 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:53,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 126 states [2018-12-03 16:46:53,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2018-12-03 16:46:53,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3101, Invalid=12649, Unknown=0, NotChecked=0, Total=15750 [2018-12-03 16:46:53,730 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand 126 states. [2018-12-03 16:46:56,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:56,185 INFO L93 Difference]: Finished difference Result 162 states and 164 transitions. [2018-12-03 16:46:56,186 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-12-03 16:46:56,186 INFO L78 Accepts]: Start accepts. Automaton has 126 states. Word has length 95 [2018-12-03 16:46:56,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:56,186 INFO L225 Difference]: With dead ends: 162 [2018-12-03 16:46:56,186 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 16:46:56,187 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 66 SyntacticMatches, 61 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13022 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=4682, Invalid=19810, Unknown=0, NotChecked=0, Total=24492 [2018-12-03 16:46:56,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 16:46:56,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-12-03 16:46:56,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-12-03 16:46:56,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-12-03 16:46:56,209 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 95 [2018-12-03 16:46:56,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:56,209 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-12-03 16:46:56,209 INFO L481 AbstractCegarLoop]: Interpolant automaton has 126 states. [2018-12-03 16:46:56,209 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-12-03 16:46:56,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-12-03 16:46:56,210 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:56,210 INFO L402 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1] [2018-12-03 16:46:56,210 INFO L423 AbstractCegarLoop]: === Iteration 62 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:56,210 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:56,210 INFO L82 PathProgramCache]: Analyzing trace with hash -1538619588, now seen corresponding path program 60 times [2018-12-03 16:46:56,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:56,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:56,211 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:56,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:56,211 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:56,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:46:56,741 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 16:46:56,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:56,741 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:46:56,741 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:46:56,741 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:46:56,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:46:56,742 INFO 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 16:46:56,750 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:46:56,750 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:46:56,822 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:46:56,822 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:46:56,825 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:46:56,863 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 16:46:56,863 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:46:57,622 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 16:46:57,641 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:46:57,641 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 36 [2018-12-03 16:46:57,641 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:46:57,641 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-12-03 16:46:57,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-12-03 16:46:57,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=600, Invalid=732, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 16:46:57,642 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 37 states. [2018-12-03 16:46:58,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:46:58,307 INFO L93 Difference]: Finished difference Result 105 states and 106 transitions. [2018-12-03 16:46:58,307 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 16:46:58,307 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 96 [2018-12-03 16:46:58,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:46:58,308 INFO L225 Difference]: With dead ends: 105 [2018-12-03 16:46:58,308 INFO L226 Difference]: Without dead ends: 103 [2018-12-03 16:46:58,309 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 158 SyntacticMatches, 62 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2079 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1753, Invalid=2939, Unknown=0, NotChecked=0, Total=4692 [2018-12-03 16:46:58,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-03 16:46:58,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 99. [2018-12-03 16:46:58,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-12-03 16:46:58,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2018-12-03 16:46:58,342 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 96 [2018-12-03 16:46:58,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:46:58,342 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2018-12-03 16:46:58,342 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-12-03 16:46:58,342 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2018-12-03 16:46:58,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-12-03 16:46:58,343 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:46:58,343 INFO L402 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1] [2018-12-03 16:46:58,343 INFO L423 AbstractCegarLoop]: === Iteration 63 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:46:58,344 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:46:58,344 INFO L82 PathProgramCache]: Analyzing trace with hash -1144621930, now seen corresponding path program 61 times [2018-12-03 16:46:58,344 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:46:58,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:58,345 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:46:58,345 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:46:58,345 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:46:58,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:00,049 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 16:47:00,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:00,049 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:00,049 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:00,049 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:00,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:00,050 INFO 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 16:47:00,058 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:00,058 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:47:00,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:00,137 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:03,085 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 16:47:03,085 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:04,908 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 16:47:04,926 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:04,926 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 129 [2018-12-03 16:47:04,927 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:04,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 130 states [2018-12-03 16:47:04,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2018-12-03 16:47:04,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3297, Invalid=13473, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 16:47:04,928 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand 130 states. [2018-12-03 16:47:07,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:07,580 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2018-12-03 16:47:07,580 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-12-03 16:47:07,580 INFO L78 Accepts]: Start accepts. Automaton has 130 states. Word has length 98 [2018-12-03 16:47:07,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:07,581 INFO L225 Difference]: With dead ends: 167 [2018-12-03 16:47:07,581 INFO L226 Difference]: Without dead ends: 100 [2018-12-03 16:47:07,582 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 68 SyntacticMatches, 63 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13890 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=4977, Invalid=21105, Unknown=0, NotChecked=0, Total=26082 [2018-12-03 16:47:07,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-12-03 16:47:07,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2018-12-03 16:47:07,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-12-03 16:47:07,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2018-12-03 16:47:07,607 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 98 [2018-12-03 16:47:07,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:07,607 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2018-12-03 16:47:07,607 INFO L481 AbstractCegarLoop]: Interpolant automaton has 130 states. [2018-12-03 16:47:07,607 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2018-12-03 16:47:07,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-12-03 16:47:07,607 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:07,607 INFO L402 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1] [2018-12-03 16:47:07,608 INFO L423 AbstractCegarLoop]: === Iteration 64 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:07,608 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:07,608 INFO L82 PathProgramCache]: Analyzing trace with hash -941354483, now seen corresponding path program 62 times [2018-12-03 16:47:07,608 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:07,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:07,609 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:07,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:07,609 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:07,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:08,150 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 16:47:08,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:08,150 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:08,151 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:08,151 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:08,151 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:08,151 INFO 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 16:47:08,160 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:47:08,160 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:47:08,504 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-12-03 16:47:08,504 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:08,509 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:08,599 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 16:47:08,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:09,376 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 16:47:09,395 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:09,395 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 37 [2018-12-03 16:47:09,395 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:09,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 16:47:09,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 16:47:09,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=635, Invalid=771, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 16:47:09,396 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 38 states. [2018-12-03 16:47:10,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:10,213 INFO L93 Difference]: Finished difference Result 108 states and 109 transitions. [2018-12-03 16:47:10,213 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 16:47:10,213 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 99 [2018-12-03 16:47:10,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:10,214 INFO L225 Difference]: With dead ends: 108 [2018-12-03 16:47:10,215 INFO L226 Difference]: Without dead ends: 106 [2018-12-03 16:47:10,215 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 163 SyntacticMatches, 64 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2210 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1857, Invalid=3113, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 16:47:10,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-12-03 16:47:10,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 102. [2018-12-03 16:47:10,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-12-03 16:47:10,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2018-12-03 16:47:10,241 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 99 [2018-12-03 16:47:10,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:10,241 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2018-12-03 16:47:10,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 16:47:10,241 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2018-12-03 16:47:10,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-12-03 16:47:10,242 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:10,242 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1] [2018-12-03 16:47:10,242 INFO L423 AbstractCegarLoop]: === Iteration 65 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:10,243 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:10,243 INFO L82 PathProgramCache]: Analyzing trace with hash 1596493607, now seen corresponding path program 63 times [2018-12-03 16:47:10,243 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:10,243 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:10,243 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:10,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:10,244 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:10,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:11,748 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 16:47:11,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:11,748 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:11,748 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:11,749 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:11,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:11,749 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:47:11,759 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:47:11,759 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:47:11,838 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:47:11,838 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:11,843 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:15,036 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 16:47:15,036 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:16,370 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 16:47:16,389 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:16,389 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 133 [2018-12-03 16:47:16,390 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:16,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2018-12-03 16:47:16,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2018-12-03 16:47:16,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3499, Invalid=14323, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 16:47:16,391 INFO L87 Difference]: Start difference. First operand 102 states and 103 transitions. Second operand 134 states. [2018-12-03 16:47:20,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:20,554 INFO L93 Difference]: Finished difference Result 172 states and 174 transitions. [2018-12-03 16:47:20,554 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-12-03 16:47:20,554 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 101 [2018-12-03 16:47:20,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:20,555 INFO L225 Difference]: With dead ends: 172 [2018-12-03 16:47:20,555 INFO L226 Difference]: Without dead ends: 103 [2018-12-03 16:47:20,556 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 70 SyntacticMatches, 65 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14786 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=5281, Invalid=22441, Unknown=0, NotChecked=0, Total=27722 [2018-12-03 16:47:20,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-03 16:47:20,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2018-12-03 16:47:20,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2018-12-03 16:47:20,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2018-12-03 16:47:20,580 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 101 [2018-12-03 16:47:20,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:20,581 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2018-12-03 16:47:20,581 INFO L481 AbstractCegarLoop]: Interpolant automaton has 134 states. [2018-12-03 16:47:20,581 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2018-12-03 16:47:20,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-12-03 16:47:20,581 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:20,581 INFO L402 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1] [2018-12-03 16:47:20,582 INFO L423 AbstractCegarLoop]: === Iteration 66 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:20,582 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:20,582 INFO L82 PathProgramCache]: Analyzing trace with hash 1233119824, now seen corresponding path program 64 times [2018-12-03 16:47:20,582 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:20,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:20,583 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:20,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:20,583 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:20,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:21,263 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 16:47:21,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:21,263 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:21,263 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:21,263 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:21,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:21,264 INFO 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 16:47:21,273 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:21,273 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:47:21,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:21,354 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:21,475 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 16:47:21,476 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:22,301 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 16:47:22,319 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:22,319 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 38 [2018-12-03 16:47:22,320 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:22,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-12-03 16:47:22,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-12-03 16:47:22,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=671, Invalid=811, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 16:47:22,320 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand 39 states. [2018-12-03 16:47:23,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:23,039 INFO L93 Difference]: Finished difference Result 111 states and 112 transitions. [2018-12-03 16:47:23,039 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 16:47:23,039 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 102 [2018-12-03 16:47:23,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:23,040 INFO L225 Difference]: With dead ends: 111 [2018-12-03 16:47:23,040 INFO L226 Difference]: Without dead ends: 109 [2018-12-03 16:47:23,040 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 168 SyntacticMatches, 66 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2345 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1964, Invalid=3292, Unknown=0, NotChecked=0, Total=5256 [2018-12-03 16:47:23,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-12-03 16:47:23,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 105. [2018-12-03 16:47:23,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-12-03 16:47:23,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 106 transitions. [2018-12-03 16:47:23,066 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 106 transitions. Word has length 102 [2018-12-03 16:47:23,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:23,067 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 106 transitions. [2018-12-03 16:47:23,067 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-12-03 16:47:23,067 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 106 transitions. [2018-12-03 16:47:23,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-12-03 16:47:23,067 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:23,067 INFO L402 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1] [2018-12-03 16:47:23,067 INFO L423 AbstractCegarLoop]: === Iteration 67 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:23,068 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:23,068 INFO L82 PathProgramCache]: Analyzing trace with hash -382770518, now seen corresponding path program 65 times [2018-12-03 16:47:23,068 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:23,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:23,068 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:23,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:23,068 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:23,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:24,576 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 16:47:24,577 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:24,577 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:24,577 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:24,577 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:24,577 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:24,577 INFO 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 16:47:24,585 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:47:24,586 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:47:24,705 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-12-03 16:47:24,705 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:24,709 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:28,039 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 16:47:28,040 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:29,475 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 16:47:29,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:29,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 137 [2018-12-03 16:47:29,494 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:29,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 138 states [2018-12-03 16:47:29,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 138 interpolants. [2018-12-03 16:47:29,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3707, Invalid=15199, Unknown=0, NotChecked=0, Total=18906 [2018-12-03 16:47:29,496 INFO L87 Difference]: Start difference. First operand 105 states and 106 transitions. Second operand 138 states. [2018-12-03 16:47:33,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:33,232 INFO L93 Difference]: Finished difference Result 177 states and 179 transitions. [2018-12-03 16:47:33,232 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-12-03 16:47:33,233 INFO L78 Accepts]: Start accepts. Automaton has 138 states. Word has length 104 [2018-12-03 16:47:33,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:33,233 INFO L225 Difference]: With dead ends: 177 [2018-12-03 16:47:33,233 INFO L226 Difference]: Without dead ends: 106 [2018-12-03 16:47:33,234 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 72 SyntacticMatches, 67 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15710 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=5594, Invalid=23818, Unknown=0, NotChecked=0, Total=29412 [2018-12-03 16:47:33,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-12-03 16:47:33,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-12-03 16:47:33,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-12-03 16:47:33,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2018-12-03 16:47:33,269 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 104 [2018-12-03 16:47:33,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:33,269 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2018-12-03 16:47:33,269 INFO L481 AbstractCegarLoop]: Interpolant automaton has 138 states. [2018-12-03 16:47:33,270 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2018-12-03 16:47:33,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-12-03 16:47:33,270 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:33,270 INFO L402 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1] [2018-12-03 16:47:33,270 INFO L423 AbstractCegarLoop]: === Iteration 68 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:33,271 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:33,271 INFO L82 PathProgramCache]: Analyzing trace with hash 1961413345, now seen corresponding path program 66 times [2018-12-03 16:47:33,271 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:33,271 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:33,271 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:33,271 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:33,272 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:33,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:33,842 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 16:47:33,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:33,842 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:33,842 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:33,842 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:33,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:33,842 INFO 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 16:47:33,850 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:47:33,850 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:47:33,932 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:47:33,932 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:33,936 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:33,993 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 16:47:33,993 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:34,836 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 16:47:34,874 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:34,874 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 39 [2018-12-03 16:47:34,875 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:34,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-12-03 16:47:34,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-12-03 16:47:34,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=708, Invalid=852, Unknown=0, NotChecked=0, Total=1560 [2018-12-03 16:47:34,875 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand 40 states. [2018-12-03 16:47:35,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:35,843 INFO L93 Difference]: Finished difference Result 114 states and 115 transitions. [2018-12-03 16:47:35,843 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 16:47:35,843 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 105 [2018-12-03 16:47:35,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:35,844 INFO L225 Difference]: With dead ends: 114 [2018-12-03 16:47:35,844 INFO L226 Difference]: Without dead ends: 112 [2018-12-03 16:47:35,845 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 16:47:35,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-12-03 16:47:35,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 108. [2018-12-03 16:47:35,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-12-03 16:47:35,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2018-12-03 16:47:35,874 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 105 [2018-12-03 16:47:35,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:35,875 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2018-12-03 16:47:35,875 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-12-03 16:47:35,875 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2018-12-03 16:47:35,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-12-03 16:47:35,875 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:35,875 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1] [2018-12-03 16:47:35,875 INFO L423 AbstractCegarLoop]: === Iteration 69 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:35,876 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:35,876 INFO L82 PathProgramCache]: Analyzing trace with hash -572366085, now seen corresponding path program 67 times [2018-12-03 16:47:35,876 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:35,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:35,876 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:35,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:35,877 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:35,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:37,487 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 16:47:37,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:37,487 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:37,487 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:37,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:37,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:37,487 INFO 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 16:47:37,495 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:37,495 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:47:37,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:37,580 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:41,088 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 16:47:41,089 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:42,606 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 16:47:42,625 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:42,625 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 141 [2018-12-03 16:47:42,625 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:42,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 142 states [2018-12-03 16:47:42,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2018-12-03 16:47:42,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3921, Invalid=16101, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 16:47:42,627 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 142 states. [2018-12-03 16:47:46,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:46,444 INFO L93 Difference]: Finished difference Result 182 states and 184 transitions. [2018-12-03 16:47:46,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-03 16:47:46,444 INFO L78 Accepts]: Start accepts. Automaton has 142 states. Word has length 107 [2018-12-03 16:47:46,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:46,445 INFO L225 Difference]: With dead ends: 182 [2018-12-03 16:47:46,445 INFO L226 Difference]: Without dead ends: 109 [2018-12-03 16:47:46,446 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 74 SyntacticMatches, 69 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16662 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=5916, Invalid=25236, Unknown=0, NotChecked=0, Total=31152 [2018-12-03 16:47:46,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-12-03 16:47:46,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2018-12-03 16:47:46,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-12-03 16:47:46,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2018-12-03 16:47:46,476 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 107 [2018-12-03 16:47:46,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:46,476 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2018-12-03 16:47:46,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has 142 states. [2018-12-03 16:47:46,476 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2018-12-03 16:47:46,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2018-12-03 16:47:46,477 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:46,477 INFO L402 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1] [2018-12-03 16:47:46,477 INFO L423 AbstractCegarLoop]: === Iteration 70 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:46,477 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:46,477 INFO L82 PathProgramCache]: Analyzing trace with hash -1159136412, now seen corresponding path program 68 times [2018-12-03 16:47:46,477 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:46,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:46,478 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:47:46,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:46,478 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:46,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:47,091 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 16:47:47,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:47,091 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:47,091 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:47,092 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:47,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:47,092 INFO 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 16:47:47,100 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:47:47,100 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:47:47,229 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2018-12-03 16:47:47,229 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:47,233 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:47,288 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 16:47:47,288 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:48,190 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 16:47:48,208 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:48,208 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 40 [2018-12-03 16:47:48,209 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:48,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 16:47:48,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 16:47:48,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=746, Invalid=894, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 16:47:48,209 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 41 states. [2018-12-03 16:47:49,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:47:49,014 INFO L93 Difference]: Finished difference Result 117 states and 118 transitions. [2018-12-03 16:47:49,014 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 16:47:49,014 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 108 [2018-12-03 16:47:49,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:47:49,015 INFO L225 Difference]: With dead ends: 117 [2018-12-03 16:47:49,015 INFO L226 Difference]: Without dead ends: 115 [2018-12-03 16:47:49,015 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 178 SyntacticMatches, 70 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2627 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2187, Invalid=3665, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 16:47:49,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-12-03 16:47:49,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 111. [2018-12-03 16:47:49,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-12-03 16:47:49,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 112 transitions. [2018-12-03 16:47:49,044 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 112 transitions. Word has length 108 [2018-12-03 16:47:49,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:47:49,045 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 112 transitions. [2018-12-03 16:47:49,045 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 16:47:49,045 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 112 transitions. [2018-12-03 16:47:49,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-12-03 16:47:49,045 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:47:49,045 INFO L402 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1] [2018-12-03 16:47:49,045 INFO L423 AbstractCegarLoop]: === Iteration 71 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:47:49,046 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:47:49,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1533509954, now seen corresponding path program 69 times [2018-12-03 16:47:49,046 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:47:49,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:49,046 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:47:49,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:47:49,047 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:47:49,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:47:50,976 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 16:47:50,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:50,977 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:47:50,977 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:47:50,977 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:47:50,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:47:50,977 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 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 16:47:50,985 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:47:50,986 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:47:51,074 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:47:51,074 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:47:51,079 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:47:54,531 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 16:47:54,531 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:47:56,464 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 16:47:56,484 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:47:56,484 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 145 [2018-12-03 16:47:56,485 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:47:56,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2018-12-03 16:47:56,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2018-12-03 16:47:56,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4141, Invalid=17029, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 16:47:56,486 INFO L87 Difference]: Start difference. First operand 111 states and 112 transitions. Second operand 146 states. [2018-12-03 16:48:01,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:01,427 INFO L93 Difference]: Finished difference Result 187 states and 189 transitions. [2018-12-03 16:48:01,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-12-03 16:48:01,427 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 110 [2018-12-03 16:48:01,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:01,428 INFO L225 Difference]: With dead ends: 187 [2018-12-03 16:48:01,428 INFO L226 Difference]: Without dead ends: 112 [2018-12-03 16:48:01,430 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 76 SyntacticMatches, 71 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17642 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=6247, Invalid=26695, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 16:48:01,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-12-03 16:48:01,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2018-12-03 16:48:01,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-12-03 16:48:01,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2018-12-03 16:48:01,459 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 110 [2018-12-03 16:48:01,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:01,460 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2018-12-03 16:48:01,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has 146 states. [2018-12-03 16:48:01,460 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2018-12-03 16:48:01,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-12-03 16:48:01,460 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:01,460 INFO L402 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1] [2018-12-03 16:48:01,460 INFO L423 AbstractCegarLoop]: === Iteration 72 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:01,461 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:01,461 INFO L82 PathProgramCache]: Analyzing trace with hash -1491426891, now seen corresponding path program 70 times [2018-12-03 16:48:01,461 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:01,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:01,461 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:01,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:01,462 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:01,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:02,141 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 16:48:02,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:02,141 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:02,141 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:02,141 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:02,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:02,141 INFO 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 16:48:02,149 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:02,149 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:48:02,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:02,239 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:02,448 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 16:48:02,448 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:03,444 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 16:48:03,462 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:03,463 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 41 [2018-12-03 16:48:03,463 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:03,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-12-03 16:48:03,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-12-03 16:48:03,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=785, Invalid=937, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 16:48:03,464 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand 42 states. [2018-12-03 16:48:04,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:04,283 INFO L93 Difference]: Finished difference Result 120 states and 121 transitions. [2018-12-03 16:48:04,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 16:48:04,283 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 111 [2018-12-03 16:48:04,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:04,284 INFO L225 Difference]: With dead ends: 120 [2018-12-03 16:48:04,284 INFO L226 Difference]: Without dead ends: 118 [2018-12-03 16:48:04,284 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 183 SyntacticMatches, 72 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2774 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2303, Invalid=3859, Unknown=0, NotChecked=0, Total=6162 [2018-12-03 16:48:04,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-12-03 16:48:04,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 114. [2018-12-03 16:48:04,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-12-03 16:48:04,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2018-12-03 16:48:04,315 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 111 [2018-12-03 16:48:04,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:04,315 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2018-12-03 16:48:04,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-12-03 16:48:04,315 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2018-12-03 16:48:04,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-12-03 16:48:04,316 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:04,316 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1] [2018-12-03 16:48:04,316 INFO L423 AbstractCegarLoop]: === Iteration 73 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:04,316 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:04,316 INFO L82 PathProgramCache]: Analyzing trace with hash 1257886927, now seen corresponding path program 71 times [2018-12-03 16:48:04,316 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:04,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:04,317 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:04,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:04,317 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:04,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:06,423 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 16:48:06,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:06,424 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:06,424 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:06,424 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:06,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:06,424 INFO 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 16:48:06,432 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:48:06,433 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:48:06,571 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2018-12-03 16:48:06,572 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:06,576 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:10,225 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 16:48:10,225 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:12,224 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 16:48:12,242 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:12,243 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 149 [2018-12-03 16:48:12,243 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:12,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 150 states [2018-12-03 16:48:12,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2018-12-03 16:48:12,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4367, Invalid=17983, Unknown=0, NotChecked=0, Total=22350 [2018-12-03 16:48:12,245 INFO L87 Difference]: Start difference. First operand 114 states and 115 transitions. Second operand 150 states. [2018-12-03 16:48:15,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:15,931 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2018-12-03 16:48:15,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-03 16:48:15,931 INFO L78 Accepts]: Start accepts. Automaton has 150 states. Word has length 113 [2018-12-03 16:48:15,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:15,932 INFO L225 Difference]: With dead ends: 192 [2018-12-03 16:48:15,932 INFO L226 Difference]: Without dead ends: 115 [2018-12-03 16:48:15,933 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 78 SyntacticMatches, 73 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18650 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=6587, Invalid=28195, Unknown=0, NotChecked=0, Total=34782 [2018-12-03 16:48:15,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-12-03 16:48:15,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2018-12-03 16:48:15,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-12-03 16:48:15,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2018-12-03 16:48:15,968 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 113 [2018-12-03 16:48:15,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:15,968 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2018-12-03 16:48:15,968 INFO L481 AbstractCegarLoop]: Interpolant automaton has 150 states. [2018-12-03 16:48:15,968 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2018-12-03 16:48:15,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-12-03 16:48:15,969 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:15,969 INFO L402 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1] [2018-12-03 16:48:15,969 INFO L423 AbstractCegarLoop]: === Iteration 74 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:15,969 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:15,970 INFO L82 PathProgramCache]: Analyzing trace with hash 823966328, now seen corresponding path program 72 times [2018-12-03 16:48:15,970 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:15,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:15,971 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:15,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:15,971 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:15,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:16,919 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 16:48:16,919 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:16,919 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:16,919 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:16,919 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:16,919 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:16,919 INFO 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 16:48:16,928 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:48:16,929 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:48:17,015 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:48:17,015 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:17,019 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:17,087 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 16:48:17,087 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:18,107 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 16:48:18,126 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:18,126 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 42 [2018-12-03 16:48:18,126 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:18,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-12-03 16:48:18,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-12-03 16:48:18,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=825, Invalid=981, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 16:48:18,127 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand 43 states. [2018-12-03 16:48:18,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:18,976 INFO L93 Difference]: Finished difference Result 123 states and 124 transitions. [2018-12-03 16:48:18,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-12-03 16:48:18,977 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 114 [2018-12-03 16:48:18,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:18,977 INFO L225 Difference]: With dead ends: 123 [2018-12-03 16:48:18,977 INFO L226 Difference]: Without dead ends: 121 [2018-12-03 16:48:18,978 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 188 SyntacticMatches, 74 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2925 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2422, Invalid=4058, Unknown=0, NotChecked=0, Total=6480 [2018-12-03 16:48:18,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-12-03 16:48:19,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 117. [2018-12-03 16:48:19,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-12-03 16:48:19,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 118 transitions. [2018-12-03 16:48:19,011 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 118 transitions. Word has length 114 [2018-12-03 16:48:19,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:19,011 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 118 transitions. [2018-12-03 16:48:19,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-12-03 16:48:19,011 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 118 transitions. [2018-12-03 16:48:19,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-12-03 16:48:19,011 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:19,012 INFO L402 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1] [2018-12-03 16:48:19,012 INFO L423 AbstractCegarLoop]: === Iteration 75 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:19,012 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:19,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1557711058, now seen corresponding path program 73 times [2018-12-03 16:48:19,012 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:19,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:19,013 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:19,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:19,013 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:19,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:20,910 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 16:48:20,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:20,911 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:20,911 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:20,911 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:20,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:20,911 INFO 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 16:48:20,919 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:20,919 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:48:21,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:21,023 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:25,097 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 16:48:25,097 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:27,163 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 16:48:27,182 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:27,182 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 153 [2018-12-03 16:48:27,182 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:27,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 154 states [2018-12-03 16:48:27,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2018-12-03 16:48:27,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4599, Invalid=18963, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 16:48:27,184 INFO L87 Difference]: Start difference. First operand 117 states and 118 transitions. Second operand 154 states. [2018-12-03 16:48:30,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:30,652 INFO L93 Difference]: Finished difference Result 197 states and 199 transitions. [2018-12-03 16:48:30,652 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2018-12-03 16:48:30,652 INFO L78 Accepts]: Start accepts. Automaton has 154 states. Word has length 116 [2018-12-03 16:48:30,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:30,653 INFO L225 Difference]: With dead ends: 197 [2018-12-03 16:48:30,653 INFO L226 Difference]: Without dead ends: 118 [2018-12-03 16:48:30,654 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 80 SyntacticMatches, 75 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19686 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=6936, Invalid=29736, Unknown=0, NotChecked=0, Total=36672 [2018-12-03 16:48:30,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-12-03 16:48:30,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2018-12-03 16:48:30,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-12-03 16:48:30,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2018-12-03 16:48:30,686 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 116 [2018-12-03 16:48:30,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:30,686 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2018-12-03 16:48:30,686 INFO L481 AbstractCegarLoop]: Interpolant automaton has 154 states. [2018-12-03 16:48:30,686 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2018-12-03 16:48:30,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-12-03 16:48:30,687 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:30,687 INFO L402 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1] [2018-12-03 16:48:30,687 INFO L423 AbstractCegarLoop]: === Iteration 76 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:30,687 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:30,687 INFO L82 PathProgramCache]: Analyzing trace with hash -1814260087, now seen corresponding path program 74 times [2018-12-03 16:48:30,687 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:30,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:30,688 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:30,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:30,688 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:30,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:31,513 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 16:48:31,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:31,514 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:31,514 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:31,514 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:31,514 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:31,514 INFO 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 16:48:31,521 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:48:31,522 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:48:31,672 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-12-03 16:48:31,672 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:31,676 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:31,749 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 16:48:31,749 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:32,826 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 16:48:32,844 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:32,845 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 43 [2018-12-03 16:48:32,845 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:32,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 16:48:32,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 16:48:32,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=866, Invalid=1026, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 16:48:32,846 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand 44 states. [2018-12-03 16:48:33,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:33,752 INFO L93 Difference]: Finished difference Result 126 states and 127 transitions. [2018-12-03 16:48:33,752 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 16:48:33,752 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 117 [2018-12-03 16:48:33,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:33,753 INFO L225 Difference]: With dead ends: 126 [2018-12-03 16:48:33,753 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 16:48:33,754 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 193 SyntacticMatches, 76 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3080 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2544, Invalid=4262, Unknown=0, NotChecked=0, Total=6806 [2018-12-03 16:48:33,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 16:48:33,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 120. [2018-12-03 16:48:33,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-12-03 16:48:33,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2018-12-03 16:48:33,788 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 117 [2018-12-03 16:48:33,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:33,788 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2018-12-03 16:48:33,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 16:48:33,788 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2018-12-03 16:48:33,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-12-03 16:48:33,789 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:33,789 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1] [2018-12-03 16:48:33,789 INFO L423 AbstractCegarLoop]: === Iteration 77 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:33,789 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:33,789 INFO L82 PathProgramCache]: Analyzing trace with hash 252830883, now seen corresponding path program 75 times [2018-12-03 16:48:33,789 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:33,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:33,790 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:33,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:33,790 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:33,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:36,049 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 16:48:36,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:36,050 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:36,050 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:36,050 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:36,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:36,050 INFO 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 16:48:36,059 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:48:36,059 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:48:36,154 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:48:36,154 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:36,160 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:40,407 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 16:48:40,407 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:42,608 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 16:48:42,627 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:42,627 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 157 [2018-12-03 16:48:42,627 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:42,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2018-12-03 16:48:42,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2018-12-03 16:48:42,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4837, Invalid=19969, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 16:48:42,629 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand 158 states. [2018-12-03 16:48:46,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:46,978 INFO L93 Difference]: Finished difference Result 202 states and 204 transitions. [2018-12-03 16:48:46,978 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-12-03 16:48:46,978 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 119 [2018-12-03 16:48:46,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:46,979 INFO L225 Difference]: With dead ends: 202 [2018-12-03 16:48:46,979 INFO L226 Difference]: Without dead ends: 121 [2018-12-03 16:48:46,981 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 82 SyntacticMatches, 77 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20750 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=7294, Invalid=31318, Unknown=0, NotChecked=0, Total=38612 [2018-12-03 16:48:46,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-12-03 16:48:47,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2018-12-03 16:48:47,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2018-12-03 16:48:47,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 122 transitions. [2018-12-03 16:48:47,014 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 122 transitions. Word has length 119 [2018-12-03 16:48:47,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:47,014 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 122 transitions. [2018-12-03 16:48:47,014 INFO L481 AbstractCegarLoop]: Interpolant automaton has 158 states. [2018-12-03 16:48:47,014 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 122 transitions. [2018-12-03 16:48:47,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-12-03 16:48:47,015 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:47,015 INFO L402 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1] [2018-12-03 16:48:47,015 INFO L423 AbstractCegarLoop]: === Iteration 78 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:47,015 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:47,015 INFO L82 PathProgramCache]: Analyzing trace with hash 850536332, now seen corresponding path program 76 times [2018-12-03 16:48:47,015 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:47,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:47,016 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:47,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:47,016 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:47,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:47,892 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 16:48:47,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:47,892 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:47,892 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:47,892 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:47,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:47,892 INFO 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 16:48:47,900 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:47,900 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:48:47,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:47,998 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:48,088 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 16:48:48,089 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:49,172 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 16:48:49,191 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:49,191 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 44 [2018-12-03 16:48:49,191 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:49,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 16:48:49,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 16:48:49,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=908, Invalid=1072, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 16:48:49,192 INFO L87 Difference]: Start difference. First operand 121 states and 122 transitions. Second operand 45 states. [2018-12-03 16:48:50,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:50,144 INFO L93 Difference]: Finished difference Result 129 states and 130 transitions. [2018-12-03 16:48:50,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 16:48:50,144 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 120 [2018-12-03 16:48:50,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:50,145 INFO L225 Difference]: With dead ends: 129 [2018-12-03 16:48:50,145 INFO L226 Difference]: Without dead ends: 127 [2018-12-03 16:48:50,146 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 198 SyntacticMatches, 78 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3239 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2669, Invalid=4471, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 16:48:50,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-12-03 16:48:50,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 123. [2018-12-03 16:48:50,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-12-03 16:48:50,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 124 transitions. [2018-12-03 16:48:50,182 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 124 transitions. Word has length 120 [2018-12-03 16:48:50,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:50,182 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 124 transitions. [2018-12-03 16:48:50,182 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 16:48:50,182 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 124 transitions. [2018-12-03 16:48:50,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-12-03 16:48:50,183 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:50,183 INFO L402 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1] [2018-12-03 16:48:50,183 INFO L423 AbstractCegarLoop]: === Iteration 79 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:50,183 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:50,183 INFO L82 PathProgramCache]: Analyzing trace with hash 1321681126, now seen corresponding path program 77 times [2018-12-03 16:48:50,183 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:50,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:50,184 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:50,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:50,184 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:50,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:52,543 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 16:48:52,543 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:52,543 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:52,543 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:52,543 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:52,543 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:52,543 INFO 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 16:48:52,551 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:48:52,551 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:48:52,708 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-12-03 16:48:52,708 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:52,713 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:56,913 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 16:48:56,913 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:59,135 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 16:48:59,154 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:59,154 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 161 [2018-12-03 16:48:59,154 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:59,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 162 states [2018-12-03 16:48:59,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 162 interpolants. [2018-12-03 16:48:59,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5081, Invalid=21001, Unknown=0, NotChecked=0, Total=26082 [2018-12-03 16:48:59,157 INFO L87 Difference]: Start difference. First operand 123 states and 124 transitions. Second operand 162 states. [2018-12-03 16:49:05,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:05,086 INFO L93 Difference]: Finished difference Result 207 states and 209 transitions. [2018-12-03 16:49:05,086 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2018-12-03 16:49:05,086 INFO L78 Accepts]: Start accepts. Automaton has 162 states. Word has length 122 [2018-12-03 16:49:05,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:05,087 INFO L225 Difference]: With dead ends: 207 [2018-12-03 16:49:05,087 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 16:49:05,088 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 84 SyntacticMatches, 79 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21842 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=7661, Invalid=32941, Unknown=0, NotChecked=0, Total=40602 [2018-12-03 16:49:05,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 16:49:05,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-12-03 16:49:05,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-12-03 16:49:05,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2018-12-03 16:49:05,131 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 122 [2018-12-03 16:49:05,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:05,131 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2018-12-03 16:49:05,131 INFO L481 AbstractCegarLoop]: Interpolant automaton has 162 states. [2018-12-03 16:49:05,131 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2018-12-03 16:49:05,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-12-03 16:49:05,132 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:05,132 INFO L402 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1] [2018-12-03 16:49:05,132 INFO L423 AbstractCegarLoop]: === Iteration 80 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:05,132 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:05,132 INFO L82 PathProgramCache]: Analyzing trace with hash 630303069, now seen corresponding path program 78 times [2018-12-03 16:49:05,132 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:05,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:05,133 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:05,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:05,133 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:05,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:05,944 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 16:49:05,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:05,945 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:05,945 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:05,945 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:05,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:05,945 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:49:05,953 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:49:05,953 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:49:06,051 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:49:06,052 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:06,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:06,116 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 16:49:06,116 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:07,570 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 16:49:07,589 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:07,589 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 45 [2018-12-03 16:49:07,590 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:07,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-12-03 16:49:07,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-12-03 16:49:07,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=951, Invalid=1119, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 16:49:07,590 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand 46 states. [2018-12-03 16:49:08,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:08,530 INFO L93 Difference]: Finished difference Result 132 states and 133 transitions. [2018-12-03 16:49:08,530 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-12-03 16:49:08,530 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 123 [2018-12-03 16:49:08,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:08,531 INFO L225 Difference]: With dead ends: 132 [2018-12-03 16:49:08,532 INFO L226 Difference]: Without dead ends: 130 [2018-12-03 16:49:08,532 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 203 SyntacticMatches, 80 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3402 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2797, Invalid=4685, Unknown=0, NotChecked=0, Total=7482 [2018-12-03 16:49:08,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-12-03 16:49:08,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 126. [2018-12-03 16:49:08,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-12-03 16:49:08,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2018-12-03 16:49:08,585 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 123 [2018-12-03 16:49:08,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:08,586 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2018-12-03 16:49:08,586 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-12-03 16:49:08,586 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2018-12-03 16:49:08,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-12-03 16:49:08,587 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:08,587 INFO L402 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1] [2018-12-03 16:49:08,587 INFO L423 AbstractCegarLoop]: === Iteration 81 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:08,587 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:08,587 INFO L82 PathProgramCache]: Analyzing trace with hash 130912887, now seen corresponding path program 79 times [2018-12-03 16:49:08,587 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:08,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:08,588 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:08,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:08,588 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:08,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:10,993 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 16:49:10,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:10,993 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:10,993 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:10,993 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:10,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:10,994 INFO 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 16:49:11,003 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:11,003 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:49:11,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:11,105 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:15,751 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 16:49:15,751 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:18,150 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 16:49:18,169 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:18,169 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 165 [2018-12-03 16:49:18,169 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:18,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 166 states [2018-12-03 16:49:18,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2018-12-03 16:49:18,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5331, Invalid=22059, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 16:49:18,171 INFO L87 Difference]: Start difference. First operand 126 states and 127 transitions. Second operand 166 states. [2018-12-03 16:49:23,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:23,524 INFO L93 Difference]: Finished difference Result 212 states and 214 transitions. [2018-12-03 16:49:23,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-12-03 16:49:23,524 INFO L78 Accepts]: Start accepts. Automaton has 166 states. Word has length 125 [2018-12-03 16:49:23,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:23,525 INFO L225 Difference]: With dead ends: 212 [2018-12-03 16:49:23,525 INFO L226 Difference]: Without dead ends: 127 [2018-12-03 16:49:23,526 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 86 SyntacticMatches, 81 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22962 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=8037, Invalid=34605, Unknown=0, NotChecked=0, Total=42642 [2018-12-03 16:49:23,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-12-03 16:49:23,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2018-12-03 16:49:23,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-12-03 16:49:23,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2018-12-03 16:49:23,569 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 125 [2018-12-03 16:49:23,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:23,570 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2018-12-03 16:49:23,570 INFO L481 AbstractCegarLoop]: Interpolant automaton has 166 states. [2018-12-03 16:49:23,570 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2018-12-03 16:49:23,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-12-03 16:49:23,570 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:23,571 INFO L402 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1] [2018-12-03 16:49:23,571 INFO L423 AbstractCegarLoop]: === Iteration 82 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:23,571 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:23,571 INFO L82 PathProgramCache]: Analyzing trace with hash 1950368416, now seen corresponding path program 80 times [2018-12-03 16:49:23,571 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:23,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:23,572 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:23,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:23,572 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:23,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:24,436 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 16:49:24,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:24,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:24,437 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:24,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:24,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:24,437 INFO 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 16:49:24,446 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:49:24,446 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:49:24,616 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-12-03 16:49:24,617 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:24,621 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:24,686 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 16:49:24,686 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:25,953 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 16:49:25,972 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:25,973 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 44] total 46 [2018-12-03 16:49:25,973 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:25,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 16:49:25,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 16:49:25,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=995, Invalid=1167, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 16:49:25,973 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand 47 states. [2018-12-03 16:49:26,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:26,999 INFO L93 Difference]: Finished difference Result 135 states and 136 transitions. [2018-12-03 16:49:26,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 16:49:26,999 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 126 [2018-12-03 16:49:26,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:27,000 INFO L225 Difference]: With dead ends: 135 [2018-12-03 16:49:27,001 INFO L226 Difference]: Without dead ends: 133 [2018-12-03 16:49:27,002 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 208 SyntacticMatches, 82 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3569 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2928, Invalid=4904, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 16:49:27,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-12-03 16:49:27,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 129. [2018-12-03 16:49:27,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-12-03 16:49:27,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 130 transitions. [2018-12-03 16:49:27,047 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 130 transitions. Word has length 126 [2018-12-03 16:49:27,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:27,047 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 130 transitions. [2018-12-03 16:49:27,047 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 16:49:27,047 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 130 transitions. [2018-12-03 16:49:27,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-12-03 16:49:27,048 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:27,048 INFO L402 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1] [2018-12-03 16:49:27,048 INFO L423 AbstractCegarLoop]: === Iteration 83 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:27,048 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:27,048 INFO L82 PathProgramCache]: Analyzing trace with hash 1698359034, now seen corresponding path program 81 times [2018-12-03 16:49:27,048 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:27,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:27,049 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:27,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:27,049 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:27,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:29,579 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 16:49:29,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:29,580 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:29,580 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:29,580 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:29,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:29,580 INFO 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 16:49:29,588 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:49:29,588 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:49:29,686 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:49:29,686 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:29,692 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:34,559 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 16:49:34,559 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:36,796 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 16:49:36,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:36,816 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 169 [2018-12-03 16:49:36,816 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:36,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 170 states [2018-12-03 16:49:36,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2018-12-03 16:49:36,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5587, Invalid=23143, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 16:49:36,818 INFO L87 Difference]: Start difference. First operand 129 states and 130 transitions. Second operand 170 states. [2018-12-03 16:49:41,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:41,420 INFO L93 Difference]: Finished difference Result 217 states and 219 transitions. [2018-12-03 16:49:41,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-03 16:49:41,420 INFO L78 Accepts]: Start accepts. Automaton has 170 states. Word has length 128 [2018-12-03 16:49:41,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:41,421 INFO L225 Difference]: With dead ends: 217 [2018-12-03 16:49:41,421 INFO L226 Difference]: Without dead ends: 130 [2018-12-03 16:49:41,423 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 88 SyntacticMatches, 83 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24110 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=8422, Invalid=36310, Unknown=0, NotChecked=0, Total=44732 [2018-12-03 16:49:41,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-12-03 16:49:41,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2018-12-03 16:49:41,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-12-03 16:49:41,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-12-03 16:49:41,467 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 128 [2018-12-03 16:49:41,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:41,467 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-12-03 16:49:41,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has 170 states. [2018-12-03 16:49:41,468 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-12-03 16:49:41,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-12-03 16:49:41,468 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:41,468 INFO L402 BasicCegarLoop]: trace histogram [42, 42, 41, 1, 1, 1, 1] [2018-12-03 16:49:41,469 INFO L423 AbstractCegarLoop]: === Iteration 84 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:41,469 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:41,469 INFO L82 PathProgramCache]: Analyzing trace with hash -1684219343, now seen corresponding path program 82 times [2018-12-03 16:49:41,469 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:41,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:41,470 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:41,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:41,470 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:41,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:42,365 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 16:49:42,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:42,366 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:42,366 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:42,366 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:42,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:42,366 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:42,376 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:42,377 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:49:42,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:42,483 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:42,544 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 16:49:42,545 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:44,175 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 16:49:44,195 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:44,195 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45, 45] total 47 [2018-12-03 16:49:44,195 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:44,195 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-12-03 16:49:44,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-12-03 16:49:44,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1040, Invalid=1216, Unknown=0, NotChecked=0, Total=2256 [2018-12-03 16:49:44,196 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 48 states. [2018-12-03 16:49:45,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:45,209 INFO L93 Difference]: Finished difference Result 138 states and 139 transitions. [2018-12-03 16:49:45,209 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 16:49:45,210 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 129 [2018-12-03 16:49:45,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:45,210 INFO L225 Difference]: With dead ends: 138 [2018-12-03 16:49:45,211 INFO L226 Difference]: Without dead ends: 136 [2018-12-03 16:49:45,211 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 213 SyntacticMatches, 84 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3740 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3062, Invalid=5128, Unknown=0, NotChecked=0, Total=8190 [2018-12-03 16:49:45,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-12-03 16:49:45,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 132. [2018-12-03 16:49:45,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-12-03 16:49:45,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2018-12-03 16:49:45,249 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 129 [2018-12-03 16:49:45,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:45,250 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2018-12-03 16:49:45,250 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-12-03 16:49:45,250 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2018-12-03 16:49:45,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-12-03 16:49:45,250 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:45,251 INFO L402 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1] [2018-12-03 16:49:45,251 INFO L423 AbstractCegarLoop]: === Iteration 85 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:45,251 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:45,251 INFO L82 PathProgramCache]: Analyzing trace with hash 667934283, now seen corresponding path program 83 times [2018-12-03 16:49:45,251 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:45,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:45,252 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:45,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:45,252 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:45,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:47,669 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 16:49:47,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:47,670 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:47,670 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:47,670 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:47,670 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:47,670 INFO 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 16:49:47,678 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:49:47,678 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:49:47,855 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2018-12-03 16:49:47,855 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:47,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:52,940 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 16:49:52,940 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:55,554 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 16:49:55,574 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:55,574 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 173 [2018-12-03 16:49:55,574 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:55,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 174 states [2018-12-03 16:49:55,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 174 interpolants. [2018-12-03 16:49:55,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5849, Invalid=24253, Unknown=0, NotChecked=0, Total=30102 [2018-12-03 16:49:55,576 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand 174 states. [2018-12-03 16:50:01,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:01,136 INFO L93 Difference]: Finished difference Result 222 states and 224 transitions. [2018-12-03 16:50:01,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2018-12-03 16:50:01,136 INFO L78 Accepts]: Start accepts. Automaton has 174 states. Word has length 131 [2018-12-03 16:50:01,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:01,137 INFO L225 Difference]: With dead ends: 222 [2018-12-03 16:50:01,137 INFO L226 Difference]: Without dead ends: 133 [2018-12-03 16:50:01,138 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 90 SyntacticMatches, 85 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25286 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=8816, Invalid=38056, Unknown=0, NotChecked=0, Total=46872 [2018-12-03 16:50:01,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-12-03 16:50:01,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2018-12-03 16:50:01,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-12-03 16:50:01,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2018-12-03 16:50:01,178 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 131 [2018-12-03 16:50:01,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:01,178 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2018-12-03 16:50:01,179 INFO L481 AbstractCegarLoop]: Interpolant automaton has 174 states. [2018-12-03 16:50:01,179 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2018-12-03 16:50:01,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-12-03 16:50:01,179 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:01,179 INFO L402 BasicCegarLoop]: trace histogram [43, 43, 42, 1, 1, 1, 1] [2018-12-03 16:50:01,180 INFO L423 AbstractCegarLoop]: === Iteration 86 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:01,180 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:01,180 INFO L82 PathProgramCache]: Analyzing trace with hash -1201796172, now seen corresponding path program 84 times [2018-12-03 16:50:01,180 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:01,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:01,181 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:50:01,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:01,181 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:01,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:02,100 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 16:50:02,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:02,100 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:02,100 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:02,100 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:02,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:02,100 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:50:02,108 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:50:02,108 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:50:02,215 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:50:02,215 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:50:02,219 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:02,285 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 16:50:02,285 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:03,881 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 16:50:03,900 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:03,900 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 48 [2018-12-03 16:50:03,900 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:03,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-12-03 16:50:03,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-12-03 16:50:03,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1086, Invalid=1266, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 16:50:03,902 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand 49 states. [2018-12-03 16:50:04,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:04,976 INFO L93 Difference]: Finished difference Result 141 states and 142 transitions. [2018-12-03 16:50:04,976 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 16:50:04,976 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 132 [2018-12-03 16:50:04,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:04,977 INFO L225 Difference]: With dead ends: 141 [2018-12-03 16:50:04,977 INFO L226 Difference]: Without dead ends: 139 [2018-12-03 16:50:04,977 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 16:50:04,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-12-03 16:50:05,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 135. [2018-12-03 16:50:05,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-12-03 16:50:05,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2018-12-03 16:50:05,018 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 132 [2018-12-03 16:50:05,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:05,019 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2018-12-03 16:50:05,019 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-12-03 16:50:05,019 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2018-12-03 16:50:05,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-12-03 16:50:05,020 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:05,020 INFO L402 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1] [2018-12-03 16:50:05,020 INFO L423 AbstractCegarLoop]: === Iteration 87 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:05,020 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:05,020 INFO L82 PathProgramCache]: Analyzing trace with hash 420133646, now seen corresponding path program 85 times [2018-12-03 16:50:05,020 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:05,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:05,021 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:50:05,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:05,021 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:05,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:07,476 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 16:50:07,477 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:07,477 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:07,477 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:07,477 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:07,477 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:07,477 INFO 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 16:50:07,488 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:50:07,488 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:50:07,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:07,594 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:12,880 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 16:50:12,880 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:15,461 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 16:50:15,479 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:15,480 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 177 [2018-12-03 16:50:15,480 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:15,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 178 states [2018-12-03 16:50:15,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2018-12-03 16:50:15,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6117, Invalid=25389, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 16:50:15,482 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand 178 states. [2018-12-03 16:50:19,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:19,852 INFO L93 Difference]: Finished difference Result 227 states and 229 transitions. [2018-12-03 16:50:19,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2018-12-03 16:50:19,852 INFO L78 Accepts]: Start accepts. Automaton has 178 states. Word has length 134 [2018-12-03 16:50:19,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:19,852 INFO L225 Difference]: With dead ends: 227 [2018-12-03 16:50:19,853 INFO L226 Difference]: Without dead ends: 136 [2018-12-03 16:50:19,854 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 92 SyntacticMatches, 87 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26490 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=9219, Invalid=39843, Unknown=0, NotChecked=0, Total=49062 [2018-12-03 16:50:19,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-12-03 16:50:19,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2018-12-03 16:50:19,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-12-03 16:50:19,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2018-12-03 16:50:19,894 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 134 [2018-12-03 16:50:19,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:19,894 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2018-12-03 16:50:19,894 INFO L481 AbstractCegarLoop]: Interpolant automaton has 178 states. [2018-12-03 16:50:19,894 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2018-12-03 16:50:19,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-12-03 16:50:19,895 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:19,895 INFO L402 BasicCegarLoop]: trace histogram [44, 44, 43, 1, 1, 1, 1] [2018-12-03 16:50:19,895 INFO L423 AbstractCegarLoop]: === Iteration 88 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:19,895 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:19,895 INFO L82 PathProgramCache]: Analyzing trace with hash 711010565, now seen corresponding path program 86 times [2018-12-03 16:50:19,895 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:19,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:19,896 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:50:19,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:19,896 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:19,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:20,817 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 16:50:20,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:20,818 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:20,818 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:20,818 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:20,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:20,818 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:50:20,827 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:50:20,828 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:50:21,023 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2018-12-03 16:50:21,023 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:50:21,027 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:21,118 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 16:50:21,118 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:22,527 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 16:50:22,545 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:22,546 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 47] total 49 [2018-12-03 16:50:22,546 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:22,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 16:50:22,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 16:50:22,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1133, Invalid=1317, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 16:50:22,547 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand 50 states. [2018-12-03 16:50:23,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:23,664 INFO L93 Difference]: Finished difference Result 144 states and 145 transitions. [2018-12-03 16:50:23,664 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 16:50:23,664 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 135 [2018-12-03 16:50:23,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:23,665 INFO L225 Difference]: With dead ends: 144 [2018-12-03 16:50:23,665 INFO L226 Difference]: Without dead ends: 142 [2018-12-03 16:50:23,666 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 223 SyntacticMatches, 88 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4094 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3339, Invalid=5591, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 16:50:23,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-12-03 16:50:23,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 138. [2018-12-03 16:50:23,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-12-03 16:50:23,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 139 transitions. [2018-12-03 16:50:23,715 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 139 transitions. Word has length 135 [2018-12-03 16:50:23,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:23,715 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 139 transitions. [2018-12-03 16:50:23,716 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 16:50:23,716 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 139 transitions. [2018-12-03 16:50:23,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-12-03 16:50:23,716 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:23,716 INFO L402 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1] [2018-12-03 16:50:23,717 INFO L423 AbstractCegarLoop]: === Iteration 89 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:23,717 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:23,717 INFO L82 PathProgramCache]: Analyzing trace with hash 381405215, now seen corresponding path program 87 times [2018-12-03 16:50:23,717 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:23,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:23,718 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:50:23,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:23,718 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:23,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:26,663 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 16:50:26,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:26,664 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:26,664 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:26,664 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:26,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:26,664 INFO 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 16:50:26,675 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:50:26,675 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:50:26,785 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:50:26,786 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:50:26,793 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:32,312 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 16:50:32,313 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:35,008 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 16:50:35,028 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:35,028 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 181 [2018-12-03 16:50:35,028 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:35,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 182 states [2018-12-03 16:50:35,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 182 interpolants. [2018-12-03 16:50:35,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6391, Invalid=26551, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 16:50:35,030 INFO L87 Difference]: Start difference. First operand 138 states and 139 transitions. Second operand 182 states. [2018-12-03 16:50:38,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:38,900 INFO L93 Difference]: Finished difference Result 232 states and 234 transitions. [2018-12-03 16:50:38,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2018-12-03 16:50:38,900 INFO L78 Accepts]: Start accepts. Automaton has 182 states. Word has length 137 [2018-12-03 16:50:38,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:38,901 INFO L225 Difference]: With dead ends: 232 [2018-12-03 16:50:38,901 INFO L226 Difference]: Without dead ends: 139 [2018-12-03 16:50:38,902 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 94 SyntacticMatches, 89 SemanticMatches, 225 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27722 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=9631, Invalid=41671, Unknown=0, NotChecked=0, Total=51302 [2018-12-03 16:50:38,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-12-03 16:50:38,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-12-03 16:50:38,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-12-03 16:50:38,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2018-12-03 16:50:38,944 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 137 [2018-12-03 16:50:38,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:38,945 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2018-12-03 16:50:38,945 INFO L481 AbstractCegarLoop]: Interpolant automaton has 182 states. [2018-12-03 16:50:38,945 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2018-12-03 16:50:38,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2018-12-03 16:50:38,945 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:38,946 INFO L402 BasicCegarLoop]: trace histogram [45, 45, 44, 1, 1, 1, 1] [2018-12-03 16:50:38,946 INFO L423 AbstractCegarLoop]: === Iteration 90 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:38,946 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:38,946 INFO L82 PathProgramCache]: Analyzing trace with hash -1348304184, now seen corresponding path program 88 times [2018-12-03 16:50:38,946 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:38,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:38,947 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:50:38,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:38,947 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:38,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:40,208 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 16:50:40,209 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:40,209 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:40,209 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:40,209 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:40,209 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:40,209 INFO 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 16:50:40,218 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:50:40,218 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:50:40,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:40,328 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:40,394 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 16:50:40,394 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:41,811 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 16:50:41,830 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:41,830 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 50 [2018-12-03 16:50:41,830 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:41,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-12-03 16:50:41,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-12-03 16:50:41,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1181, Invalid=1369, Unknown=0, NotChecked=0, Total=2550 [2018-12-03 16:50:41,831 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand 51 states. [2018-12-03 16:50:43,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:43,003 INFO L93 Difference]: Finished difference Result 147 states and 148 transitions. [2018-12-03 16:50:43,003 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 16:50:43,003 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 138 [2018-12-03 16:50:43,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:43,004 INFO L225 Difference]: With dead ends: 147 [2018-12-03 16:50:43,004 INFO L226 Difference]: Without dead ends: 145 [2018-12-03 16:50:43,004 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 16:50:43,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-12-03 16:50:43,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 141. [2018-12-03 16:50:43,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-12-03 16:50:43,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 142 transitions. [2018-12-03 16:50:43,054 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 142 transitions. Word has length 138 [2018-12-03 16:50:43,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:43,054 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 142 transitions. [2018-12-03 16:50:43,054 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-12-03 16:50:43,054 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 142 transitions. [2018-12-03 16:50:43,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-12-03 16:50:43,055 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:43,055 INFO L402 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1] [2018-12-03 16:50:43,055 INFO L423 AbstractCegarLoop]: === Iteration 91 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:43,056 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:43,056 INFO L82 PathProgramCache]: Analyzing trace with hash 1359854882, now seen corresponding path program 89 times [2018-12-03 16:50:43,056 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:43,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:43,056 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:50:43,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:43,057 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:43,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:46,090 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 16:50:46,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:46,090 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:46,090 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:46,090 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:46,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:46,090 INFO 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 16:50:46,098 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:50:46,098 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:50:46,290 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2018-12-03 16:50:46,291 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:50:46,299 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:51,989 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 16:50:51,989 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:54,615 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 16:50:54,634 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:54,634 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 185 [2018-12-03 16:50:54,634 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:54,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 186 states [2018-12-03 16:50:54,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 186 interpolants. [2018-12-03 16:50:54,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6671, Invalid=27739, Unknown=0, NotChecked=0, Total=34410 [2018-12-03 16:50:54,636 INFO L87 Difference]: Start difference. First operand 141 states and 142 transitions. Second operand 186 states. [2018-12-03 16:50:59,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:59,292 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2018-12-03 16:50:59,292 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2018-12-03 16:50:59,292 INFO L78 Accepts]: Start accepts. Automaton has 186 states. Word has length 140 [2018-12-03 16:50:59,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:59,293 INFO L225 Difference]: With dead ends: 237 [2018-12-03 16:50:59,293 INFO L226 Difference]: Without dead ends: 142 [2018-12-03 16:50:59,294 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 96 SyntacticMatches, 91 SemanticMatches, 230 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28982 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=10052, Invalid=43540, Unknown=0, NotChecked=0, Total=53592 [2018-12-03 16:50:59,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-12-03 16:50:59,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-12-03 16:50:59,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-12-03 16:50:59,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2018-12-03 16:50:59,339 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 140 [2018-12-03 16:50:59,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:59,339 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2018-12-03 16:50:59,339 INFO L481 AbstractCegarLoop]: Interpolant automaton has 186 states. [2018-12-03 16:50:59,339 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2018-12-03 16:50:59,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-12-03 16:50:59,339 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:59,340 INFO L402 BasicCegarLoop]: trace histogram [46, 46, 45, 1, 1, 1, 1] [2018-12-03 16:50:59,340 INFO L423 AbstractCegarLoop]: === Iteration 92 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:59,340 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:59,340 INFO L82 PathProgramCache]: Analyzing trace with hash -1690200615, now seen corresponding path program 90 times [2018-12-03 16:50:59,340 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:59,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:59,341 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:50:59,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:59,341 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:59,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:00,609 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 16:51:00,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:00,609 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:00,610 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:00,610 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:00,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:00,610 INFO 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 16:51:00,618 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:51:00,618 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:51:00,734 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:51:00,734 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:51:00,740 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:00,809 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 16:51:00,809 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:02,431 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 16:51:02,451 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:02,451 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49, 49] total 51 [2018-12-03 16:51:02,451 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:02,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-12-03 16:51:02,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-12-03 16:51:02,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1230, Invalid=1422, Unknown=0, NotChecked=0, Total=2652 [2018-12-03 16:51:02,452 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand 52 states. [2018-12-03 16:51:03,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:03,610 INFO L93 Difference]: Finished difference Result 150 states and 151 transitions. [2018-12-03 16:51:03,610 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-12-03 16:51:03,611 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 141 [2018-12-03 16:51:03,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:03,611 INFO L225 Difference]: With dead ends: 150 [2018-12-03 16:51:03,611 INFO L226 Difference]: Without dead ends: 148 [2018-12-03 16:51:03,612 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 233 SyntacticMatches, 92 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4464 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=3628, Invalid=6074, Unknown=0, NotChecked=0, Total=9702 [2018-12-03 16:51:03,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-12-03 16:51:03,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 144. [2018-12-03 16:51:03,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-12-03 16:51:03,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 145 transitions. [2018-12-03 16:51:03,684 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 145 transitions. Word has length 141 [2018-12-03 16:51:03,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:03,684 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 145 transitions. [2018-12-03 16:51:03,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-12-03 16:51:03,684 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 145 transitions. [2018-12-03 16:51:03,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-12-03 16:51:03,685 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:03,685 INFO L402 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1] [2018-12-03 16:51:03,685 INFO L423 AbstractCegarLoop]: === Iteration 93 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:03,685 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:03,685 INFO L82 PathProgramCache]: Analyzing trace with hash -785100813, now seen corresponding path program 91 times [2018-12-03 16:51:03,685 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:03,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:03,686 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:51:03,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:03,686 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:03,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:06,859 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 16:51:06,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:06,859 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:06,860 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:06,860 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:06,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:06,860 INFO 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 16:51:06,872 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:51:06,872 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:51:06,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:06,985 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:13,021 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 16:51:13,021 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:15,925 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 16:51:15,944 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:15,944 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 189 [2018-12-03 16:51:15,944 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:15,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 190 states [2018-12-03 16:51:15,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2018-12-03 16:51:15,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6957, Invalid=28953, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 16:51:15,946 INFO L87 Difference]: Start difference. First operand 144 states and 145 transitions. Second operand 190 states. [2018-12-03 16:51:22,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:22,549 INFO L93 Difference]: Finished difference Result 242 states and 244 transitions. [2018-12-03 16:51:22,549 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2018-12-03 16:51:22,549 INFO L78 Accepts]: Start accepts. Automaton has 190 states. Word has length 143 [2018-12-03 16:51:22,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:22,550 INFO L225 Difference]: With dead ends: 242 [2018-12-03 16:51:22,550 INFO L226 Difference]: Without dead ends: 145 [2018-12-03 16:51:22,551 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 98 SyntacticMatches, 93 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30270 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=10482, Invalid=45450, Unknown=0, NotChecked=0, Total=55932 [2018-12-03 16:51:22,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-12-03 16:51:22,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 145. [2018-12-03 16:51:22,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2018-12-03 16:51:22,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 146 transitions. [2018-12-03 16:51:22,597 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 146 transitions. Word has length 143 [2018-12-03 16:51:22,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:22,597 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 146 transitions. [2018-12-03 16:51:22,597 INFO L481 AbstractCegarLoop]: Interpolant automaton has 190 states. [2018-12-03 16:51:22,597 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 146 transitions. [2018-12-03 16:51:22,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2018-12-03 16:51:22,598 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:22,598 INFO L402 BasicCegarLoop]: trace histogram [47, 47, 46, 1, 1, 1, 1] [2018-12-03 16:51:22,598 INFO L423 AbstractCegarLoop]: === Iteration 94 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:22,598 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:22,598 INFO L82 PathProgramCache]: Analyzing trace with hash -660297764, now seen corresponding path program 92 times [2018-12-03 16:51:22,598 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:22,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:22,599 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:51:22,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:22,599 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:22,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:23,593 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 16:51:23,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:23,593 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:23,593 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:23,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:23,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:23,593 INFO 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 16:51:23,602 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:51:23,602 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:51:23,808 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2018-12-03 16:51:23,808 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:51:23,814 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:23,882 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 16:51:23,882 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:25,784 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 16:51:25,803 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:25,803 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 52 [2018-12-03 16:51:25,803 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:25,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 16:51:25,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 16:51:25,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1280, Invalid=1476, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 16:51:25,804 INFO L87 Difference]: Start difference. First operand 145 states and 146 transitions. Second operand 53 states. [2018-12-03 16:51:27,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:27,009 INFO L93 Difference]: Finished difference Result 153 states and 154 transitions. [2018-12-03 16:51:27,009 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 16:51:27,010 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 144 [2018-12-03 16:51:27,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:27,010 INFO L225 Difference]: With dead ends: 153 [2018-12-03 16:51:27,010 INFO L226 Difference]: Without dead ends: 151 [2018-12-03 16:51:27,011 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 16:51:27,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-12-03 16:51:27,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 147. [2018-12-03 16:51:27,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-12-03 16:51:27,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2018-12-03 16:51:27,082 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 144 [2018-12-03 16:51:27,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:27,082 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2018-12-03 16:51:27,083 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 16:51:27,083 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2018-12-03 16:51:27,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-12-03 16:51:27,083 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:27,083 INFO L402 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1] [2018-12-03 16:51:27,083 INFO L423 AbstractCegarLoop]: === Iteration 95 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:27,084 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:27,084 INFO L82 PathProgramCache]: Analyzing trace with hash 1109060918, now seen corresponding path program 93 times [2018-12-03 16:51:27,084 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:27,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:27,084 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:51:27,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:27,084 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:27,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:30,054 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 16:51:30,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:30,054 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:30,054 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:30,055 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:30,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:30,055 INFO 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) [2018-12-03 16:51:30,065 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:51:30,066 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:51:30,184 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:51:30,184 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:51:30,192 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:36,698 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 16:51:36,698 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:39,589 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 16:51:39,608 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:39,608 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 193 [2018-12-03 16:51:39,608 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:39,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2018-12-03 16:51:39,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2018-12-03 16:51:39,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7249, Invalid=30193, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 16:51:39,611 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand 194 states. [2018-12-03 16:51:45,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:45,427 INFO L93 Difference]: Finished difference Result 247 states and 249 transitions. [2018-12-03 16:51:45,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2018-12-03 16:51:45,427 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 146 [2018-12-03 16:51:45,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:45,428 INFO L225 Difference]: With dead ends: 247 [2018-12-03 16:51:45,428 INFO L226 Difference]: Without dead ends: 148 [2018-12-03 16:51:45,429 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 100 SyntacticMatches, 95 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31586 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=10921, Invalid=47401, Unknown=0, NotChecked=0, Total=58322 [2018-12-03 16:51:45,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-12-03 16:51:45,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2018-12-03 16:51:45,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-12-03 16:51:45,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2018-12-03 16:51:45,477 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 146 [2018-12-03 16:51:45,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:45,477 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2018-12-03 16:51:45,477 INFO L481 AbstractCegarLoop]: Interpolant automaton has 194 states. [2018-12-03 16:51:45,477 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2018-12-03 16:51:45,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-12-03 16:51:45,478 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:45,478 INFO L402 BasicCegarLoop]: trace histogram [48, 48, 47, 1, 1, 1, 1] [2018-12-03 16:51:45,478 INFO L423 AbstractCegarLoop]: === Iteration 96 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:45,478 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:45,478 INFO L82 PathProgramCache]: Analyzing trace with hash -324984659, now seen corresponding path program 94 times [2018-12-03 16:51:45,478 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:45,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:45,479 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:51:45,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:45,479 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:45,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:46,958 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 16:51:46,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:46,958 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:46,958 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:46,958 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:46,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:46,958 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 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 16:51:46,967 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:51:46,967 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:51:47,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:47,088 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:47,159 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 16:51:47,159 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:48,833 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 16:51:48,851 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:48,852 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51, 51] total 53 [2018-12-03 16:51:48,852 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:48,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-12-03 16:51:48,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-12-03 16:51:48,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1331, Invalid=1531, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 16:51:48,853 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand 54 states. [2018-12-03 16:51:50,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:50,165 INFO L93 Difference]: Finished difference Result 156 states and 157 transitions. [2018-12-03 16:51:50,166 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2018-12-03 16:51:50,166 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 147 [2018-12-03 16:51:50,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:50,167 INFO L225 Difference]: With dead ends: 156 [2018-12-03 16:51:50,167 INFO L226 Difference]: Without dead ends: 154 [2018-12-03 16:51:50,168 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 243 SyntacticMatches, 96 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4850 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=3929, Invalid=6577, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 16:51:50,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-12-03 16:51:50,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 150. [2018-12-03 16:51:50,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-12-03 16:51:50,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2018-12-03 16:51:50,219 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 147 [2018-12-03 16:51:50,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:50,220 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2018-12-03 16:51:50,220 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-12-03 16:51:50,220 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2018-12-03 16:51:50,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-12-03 16:51:50,220 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:50,220 INFO L402 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1] [2018-12-03 16:51:50,220 INFO L423 AbstractCegarLoop]: === Iteration 97 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:50,221 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:50,221 INFO L82 PathProgramCache]: Analyzing trace with hash 1222407623, now seen corresponding path program 95 times [2018-12-03 16:51:50,221 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:50,221 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:50,221 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:51:50,221 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:50,221 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:50,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:53,631 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 16:51:53,631 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:53,631 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:53,631 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:53,631 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:53,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:53,632 INFO 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 16:51:53,663 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:51:53,663 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:51:53,883 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2018-12-03 16:51:53,883 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:51:53,889 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:00,318 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 16:52:00,318 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:03,597 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 16:52:03,616 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:03,617 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 197 [2018-12-03 16:52:03,617 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:03,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 198 states [2018-12-03 16:52:03,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 198 interpolants. [2018-12-03 16:52:03,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7547, Invalid=31459, Unknown=0, NotChecked=0, Total=39006 [2018-12-03 16:52:03,619 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand 198 states. [2018-12-03 16:52:09,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:09,576 INFO L93 Difference]: Finished difference Result 252 states and 254 transitions. [2018-12-03 16:52:09,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-12-03 16:52:09,576 INFO L78 Accepts]: Start accepts. Automaton has 198 states. Word has length 149 [2018-12-03 16:52:09,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:09,577 INFO L225 Difference]: With dead ends: 252 [2018-12-03 16:52:09,577 INFO L226 Difference]: Without dead ends: 151 [2018-12-03 16:52:09,578 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 102 SyntacticMatches, 97 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32930 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=11369, Invalid=49393, Unknown=0, NotChecked=0, Total=60762 [2018-12-03 16:52:09,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-12-03 16:52:09,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-12-03 16:52:09,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-12-03 16:52:09,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2018-12-03 16:52:09,637 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 149 [2018-12-03 16:52:09,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:09,638 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2018-12-03 16:52:09,638 INFO L481 AbstractCegarLoop]: Interpolant automaton has 198 states. [2018-12-03 16:52:09,638 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2018-12-03 16:52:09,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-12-03 16:52:09,639 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:09,639 INFO L402 BasicCegarLoop]: trace histogram [49, 49, 48, 1, 1, 1, 1] [2018-12-03 16:52:09,639 INFO L423 AbstractCegarLoop]: === Iteration 98 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:09,639 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:09,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1610316528, now seen corresponding path program 96 times [2018-12-03 16:52:09,639 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:09,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:09,640 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:52:09,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:09,640 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:09,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:10,748 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 16:52:10,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:10,749 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:10,749 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:10,749 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:10,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:10,749 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:52:10,757 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:52:10,757 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:52:10,882 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:52:10,883 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:52:10,888 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:10,963 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 16:52:10,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:12,994 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 16:52:13,013 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:13,014 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52, 52] total 54 [2018-12-03 16:52:13,014 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:13,014 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 16:52:13,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 16:52:13,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1383, Invalid=1587, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 16:52:13,015 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand 55 states. [2018-12-03 16:52:14,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:14,350 INFO L93 Difference]: Finished difference Result 159 states and 160 transitions. [2018-12-03 16:52:14,351 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2018-12-03 16:52:14,351 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 150 [2018-12-03 16:52:14,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:14,351 INFO L225 Difference]: With dead ends: 159 [2018-12-03 16:52:14,352 INFO L226 Difference]: Without dead ends: 157 [2018-12-03 16:52:14,352 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 248 SyntacticMatches, 98 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5049 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=4084, Invalid=6836, Unknown=0, NotChecked=0, Total=10920 [2018-12-03 16:52:14,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-12-03 16:52:14,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 153. [2018-12-03 16:52:14,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-12-03 16:52:14,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 154 transitions. [2018-12-03 16:52:14,405 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 154 transitions. Word has length 150 [2018-12-03 16:52:14,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:14,405 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 154 transitions. [2018-12-03 16:52:14,405 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 16:52:14,405 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 154 transitions. [2018-12-03 16:52:14,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-12-03 16:52:14,406 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:14,406 INFO L402 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1] [2018-12-03 16:52:14,406 INFO L423 AbstractCegarLoop]: === Iteration 99 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:14,406 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:14,406 INFO L82 PathProgramCache]: Analyzing trace with hash 1326009162, now seen corresponding path program 97 times [2018-12-03 16:52:14,406 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:14,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:14,407 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:52:14,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:14,407 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:14,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:17,918 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 16:52:17,918 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:17,918 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:17,918 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:17,918 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:17,918 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:17,918 INFO 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 16:52:17,927 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:52:17,927 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:52:18,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:18,052 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:24,695 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 16:52:24,695 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:28,102 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 16:52:28,120 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:28,121 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 201 [2018-12-03 16:52:28,121 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:28,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 202 states [2018-12-03 16:52:28,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 202 interpolants. [2018-12-03 16:52:28,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7851, Invalid=32751, Unknown=0, NotChecked=0, Total=40602 [2018-12-03 16:52:28,123 INFO L87 Difference]: Start difference. First operand 153 states and 154 transitions. Second operand 202 states. [2018-12-03 16:52:35,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:35,486 INFO L93 Difference]: Finished difference Result 257 states and 259 transitions. [2018-12-03 16:52:35,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2018-12-03 16:52:35,486 INFO L78 Accepts]: Start accepts. Automaton has 202 states. Word has length 152 [2018-12-03 16:52:35,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:35,487 INFO L225 Difference]: With dead ends: 257 [2018-12-03 16:52:35,487 INFO L226 Difference]: Without dead ends: 154 [2018-12-03 16:52:35,488 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 104 SyntacticMatches, 99 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34302 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=11826, Invalid=51426, Unknown=0, NotChecked=0, Total=63252 [2018-12-03 16:52:35,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-12-03 16:52:35,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 154. [2018-12-03 16:52:35,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-12-03 16:52:35,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2018-12-03 16:52:35,540 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 152 [2018-12-03 16:52:35,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:35,540 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2018-12-03 16:52:35,540 INFO L481 AbstractCegarLoop]: Interpolant automaton has 202 states. [2018-12-03 16:52:35,540 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2018-12-03 16:52:35,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-12-03 16:52:35,541 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:35,541 INFO L402 BasicCegarLoop]: trace histogram [50, 50, 49, 1, 1, 1, 1] [2018-12-03 16:52:35,541 INFO L423 AbstractCegarLoop]: === Iteration 100 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:35,541 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:35,541 INFO L82 PathProgramCache]: Analyzing trace with hash -236795519, now seen corresponding path program 98 times [2018-12-03 16:52:35,542 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:35,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:35,542 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:52:35,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:35,542 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:35,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:36,766 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 16:52:36,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:36,766 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:36,766 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:36,766 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:36,767 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:36,767 INFO 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 16:52:36,775 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:52:36,775 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:52:37,002 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-12-03 16:52:37,002 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:52:37,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:37,082 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 16:52:37,082 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:39,227 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 16:52:39,246 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:39,246 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 53] total 55 [2018-12-03 16:52:39,246 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:39,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-12-03 16:52:39,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-12-03 16:52:39,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1436, Invalid=1644, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 16:52:39,247 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand 56 states. [2018-12-03 16:52:40,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:40,570 INFO L93 Difference]: Finished difference Result 162 states and 163 transitions. [2018-12-03 16:52:40,570 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2018-12-03 16:52:40,571 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 153 [2018-12-03 16:52:40,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:40,571 INFO L225 Difference]: With dead ends: 162 [2018-12-03 16:52:40,571 INFO L226 Difference]: Without dead ends: 160 [2018-12-03 16:52:40,572 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 253 SyntacticMatches, 100 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5252 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=4242, Invalid=7100, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 16:52:40,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-03 16:52:40,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 156. [2018-12-03 16:52:40,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-12-03 16:52:40,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 157 transitions. [2018-12-03 16:52:40,627 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 157 transitions. Word has length 153 [2018-12-03 16:52:40,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:40,627 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 157 transitions. [2018-12-03 16:52:40,627 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-12-03 16:52:40,627 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 157 transitions. [2018-12-03 16:52:40,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-12-03 16:52:40,628 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:40,628 INFO L402 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1] [2018-12-03 16:52:40,628 INFO L423 AbstractCegarLoop]: === Iteration 101 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:40,629 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:40,629 INFO L82 PathProgramCache]: Analyzing trace with hash 72825243, now seen corresponding path program 99 times [2018-12-03 16:52:40,629 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:40,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:40,629 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:52:40,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:40,630 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:40,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:44,462 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 16:52:44,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:44,462 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:44,462 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:44,462 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:44,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:44,462 INFO 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 16:52:44,472 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:52:44,473 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:52:44,588 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:52:44,589 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:52:44,597 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:51,557 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 16:52:51,557 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:55,048 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 16:52:55,067 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:55,067 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 103, 103] total 205 [2018-12-03 16:52:55,067 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:55,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 206 states [2018-12-03 16:52:55,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 206 interpolants. [2018-12-03 16:52:55,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8161, Invalid=34069, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 16:52:55,070 INFO L87 Difference]: Start difference. First operand 156 states and 157 transitions. Second operand 206 states. [2018-12-03 16:52:59,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:59,651 INFO L93 Difference]: Finished difference Result 262 states and 264 transitions. [2018-12-03 16:52:59,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2018-12-03 16:52:59,651 INFO L78 Accepts]: Start accepts. Automaton has 206 states. Word has length 155 [2018-12-03 16:52:59,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:59,652 INFO L225 Difference]: With dead ends: 262 [2018-12-03 16:52:59,652 INFO L226 Difference]: Without dead ends: 157 [2018-12-03 16:52:59,654 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 106 SyntacticMatches, 101 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35702 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=12292, Invalid=53500, Unknown=0, NotChecked=0, Total=65792 [2018-12-03 16:52:59,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-12-03 16:52:59,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2018-12-03 16:52:59,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-12-03 16:52:59,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2018-12-03 16:52:59,709 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 155 [2018-12-03 16:52:59,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:59,709 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2018-12-03 16:52:59,710 INFO L481 AbstractCegarLoop]: Interpolant automaton has 206 states. [2018-12-03 16:52:59,710 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2018-12-03 16:52:59,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-12-03 16:52:59,710 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:59,710 INFO L402 BasicCegarLoop]: trace histogram [51, 51, 50, 1, 1, 1, 1] [2018-12-03 16:52:59,711 INFO L423 AbstractCegarLoop]: === Iteration 102 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:59,711 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:59,711 INFO L82 PathProgramCache]: Analyzing trace with hash 4062212, now seen corresponding path program 100 times [2018-12-03 16:52:59,711 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:59,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:59,712 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:52:59,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:59,712 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:59,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:00,962 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 16:53:00,963 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:00,963 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:53:00,963 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:53:00,963 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:53:00,963 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:00,963 INFO 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 16:53:00,972 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:53:00,972 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:53:01,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:01,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:53:01,172 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 16:53:01,172 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:53:03,354 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 16:53:03,372 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:53:03,373 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 56 [2018-12-03 16:53:03,373 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:53:03,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-12-03 16:53:03,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-12-03 16:53:03,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1490, Invalid=1702, Unknown=0, NotChecked=0, Total=3192 [2018-12-03 16:53:03,374 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand 57 states. [2018-12-03 16:53:04,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:53:04,785 INFO L93 Difference]: Finished difference Result 165 states and 166 transitions. [2018-12-03 16:53:04,785 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2018-12-03 16:53:04,785 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 156 [2018-12-03 16:53:04,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:53:04,787 INFO L225 Difference]: With dead ends: 165 [2018-12-03 16:53:04,787 INFO L226 Difference]: Without dead ends: 163 [2018-12-03 16:53:04,788 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 258 SyntacticMatches, 102 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5459 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=4403, Invalid=7369, Unknown=0, NotChecked=0, Total=11772 [2018-12-03 16:53:04,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-12-03 16:53:04,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 159. [2018-12-03 16:53:04,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-12-03 16:53:04,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2018-12-03 16:53:04,848 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 156 [2018-12-03 16:53:04,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:53:04,848 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2018-12-03 16:53:04,848 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-12-03 16:53:04,848 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2018-12-03 16:53:04,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-12-03 16:53:04,848 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:53:04,849 INFO L402 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1] [2018-12-03 16:53:04,849 INFO L423 AbstractCegarLoop]: === Iteration 103 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:53:04,849 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:53:04,849 INFO L82 PathProgramCache]: Analyzing trace with hash -391129250, now seen corresponding path program 101 times [2018-12-03 16:53:04,849 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:53:04,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:04,850 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:53:04,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:04,850 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:53:04,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:08,603 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 16:53:08,603 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:08,603 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:53:08,604 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:53:08,604 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:53:08,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:08,604 INFO 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 16:53:08,614 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:53:08,614 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:53:08,862 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2018-12-03 16:53:08,862 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:53:08,869 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:53:16,161 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 16:53:16,162 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:53:19,760 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 16:53:19,781 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:53:19,781 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 105, 105] total 209 [2018-12-03 16:53:19,781 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:53:19,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 210 states [2018-12-03 16:53:19,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 210 interpolants. [2018-12-03 16:53:19,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8477, Invalid=35413, Unknown=0, NotChecked=0, Total=43890 [2018-12-03 16:53:19,784 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand 210 states. [2018-12-03 16:53:25,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:53:25,283 INFO L93 Difference]: Finished difference Result 267 states and 269 transitions. [2018-12-03 16:53:25,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2018-12-03 16:53:25,283 INFO L78 Accepts]: Start accepts. Automaton has 210 states. Word has length 158 [2018-12-03 16:53:25,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:53:25,284 INFO L225 Difference]: With dead ends: 267 [2018-12-03 16:53:25,284 INFO L226 Difference]: Without dead ends: 160 [2018-12-03 16:53:25,286 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 108 SyntacticMatches, 103 SemanticMatches, 260 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37130 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=12767, Invalid=55615, Unknown=0, NotChecked=0, Total=68382 [2018-12-03 16:53:25,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-03 16:53:25,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-12-03 16:53:25,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-12-03 16:53:25,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2018-12-03 16:53:25,343 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 158 [2018-12-03 16:53:25,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:53:25,343 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2018-12-03 16:53:25,343 INFO L481 AbstractCegarLoop]: Interpolant automaton has 210 states. [2018-12-03 16:53:25,343 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2018-12-03 16:53:25,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-12-03 16:53:25,344 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:53:25,344 INFO L402 BasicCegarLoop]: trace histogram [52, 52, 51, 1, 1, 1, 1] [2018-12-03 16:53:25,344 INFO L423 AbstractCegarLoop]: === Iteration 104 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:53:25,344 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:53:25,344 INFO L82 PathProgramCache]: Analyzing trace with hash -211185579, now seen corresponding path program 102 times [2018-12-03 16:53:25,344 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:53:25,345 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:25,345 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:53:25,345 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:25,345 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:53:25,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:26,586 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 16:53:26,586 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:26,586 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:53:26,587 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:53:26,587 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:53:26,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:26,587 INFO 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 16:53:26,595 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:53:26,595 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:53:26,728 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:53:26,728 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:53:26,734 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:53:26,812 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 16:53:26,812 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:53:29,096 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 16:53:29,116 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:53:29,116 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55, 55] total 57 [2018-12-03 16:53:29,116 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:53:29,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-12-03 16:53:29,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-12-03 16:53:29,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1545, Invalid=1761, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 16:53:29,117 INFO L87 Difference]: Start difference. First operand 160 states and 161 transitions. Second operand 58 states. [2018-12-03 16:53:30,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:53:30,580 INFO L93 Difference]: Finished difference Result 168 states and 169 transitions. [2018-12-03 16:53:30,580 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2018-12-03 16:53:30,580 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 159 [2018-12-03 16:53:30,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:53:30,581 INFO L225 Difference]: With dead ends: 168 [2018-12-03 16:53:30,581 INFO L226 Difference]: Without dead ends: 166 [2018-12-03 16:53:30,582 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 263 SyntacticMatches, 104 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5670 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=4567, Invalid=7643, Unknown=0, NotChecked=0, Total=12210 [2018-12-03 16:53:30,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-03 16:53:30,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 162. [2018-12-03 16:53:30,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-12-03 16:53:30,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 163 transitions. [2018-12-03 16:53:30,647 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 163 transitions. Word has length 159 [2018-12-03 16:53:30,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:53:30,647 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 163 transitions. [2018-12-03 16:53:30,647 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-12-03 16:53:30,647 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 163 transitions. [2018-12-03 16:53:30,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-12-03 16:53:30,648 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:53:30,648 INFO L402 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1] [2018-12-03 16:53:30,648 INFO L423 AbstractCegarLoop]: === Iteration 105 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:53:30,648 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:53:30,649 INFO L82 PathProgramCache]: Analyzing trace with hash -1085826193, now seen corresponding path program 103 times [2018-12-03 16:53:30,649 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:53:30,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:30,649 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:53:30,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:30,650 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:53:30,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:34,561 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 16:53:34,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:34,561 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:53:34,561 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:53:34,561 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:53:34,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:34,561 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 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 16:53:34,570 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:53:34,570 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:53:34,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:34,720 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:53:42,103 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 16:53:42,103 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:53:45,919 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 16:53:45,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:53:45,939 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [107, 107, 107] total 213 [2018-12-03 16:53:45,939 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:53:45,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 214 states [2018-12-03 16:53:45,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 214 interpolants. [2018-12-03 16:53:45,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8799, Invalid=36783, Unknown=0, NotChecked=0, Total=45582 [2018-12-03 16:53:45,941 INFO L87 Difference]: Start difference. First operand 162 states and 163 transitions. Second operand 214 states. [2018-12-03 16:53:51,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:53:51,056 INFO L93 Difference]: Finished difference Result 272 states and 274 transitions. [2018-12-03 16:53:51,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2018-12-03 16:53:51,056 INFO L78 Accepts]: Start accepts. Automaton has 214 states. Word has length 161 [2018-12-03 16:53:51,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:53:51,056 INFO L225 Difference]: With dead ends: 272 [2018-12-03 16:53:51,056 INFO L226 Difference]: Without dead ends: 163 [2018-12-03 16:53:51,058 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 110 SyntacticMatches, 105 SemanticMatches, 265 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38586 ImplicationChecksByTransitivity, 17.2s TimeCoverageRelationStatistics Valid=13251, Invalid=57771, Unknown=0, NotChecked=0, Total=71022 [2018-12-03 16:53:51,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-12-03 16:53:51,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2018-12-03 16:53:51,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2018-12-03 16:53:51,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 164 transitions. [2018-12-03 16:53:51,118 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 164 transitions. Word has length 161 [2018-12-03 16:53:51,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:53:51,118 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 164 transitions. [2018-12-03 16:53:51,118 INFO L481 AbstractCegarLoop]: Interpolant automaton has 214 states. [2018-12-03 16:53:51,118 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 164 transitions. [2018-12-03 16:53:51,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2018-12-03 16:53:51,119 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:53:51,119 INFO L402 BasicCegarLoop]: trace histogram [53, 53, 52, 1, 1, 1, 1] [2018-12-03 16:53:51,119 INFO L423 AbstractCegarLoop]: === Iteration 106 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:53:51,120 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:53:51,120 INFO L82 PathProgramCache]: Analyzing trace with hash -503108840, now seen corresponding path program 104 times [2018-12-03 16:53:51,120 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:53:51,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:51,120 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:53:51,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:51,120 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:53:51,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:52,416 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 16:53:52,416 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:52,416 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:53:52,416 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:53:52,417 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:53:52,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:52,417 INFO 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 16:53:52,425 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:53:52,425 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:53:52,711 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2018-12-03 16:53:52,712 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:53:52,717 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:53:52,789 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 16:53:52,790 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:53:55,099 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 16:53:55,118 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:53:55,118 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56, 56] total 58 [2018-12-03 16:53:55,118 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:53:55,119 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 16:53:55,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 16:53:55,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1601, Invalid=1821, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 16:53:55,119 INFO L87 Difference]: Start difference. First operand 163 states and 164 transitions. Second operand 59 states. [2018-12-03 16:53:56,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:53:56,617 INFO L93 Difference]: Finished difference Result 171 states and 172 transitions. [2018-12-03 16:53:56,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-12-03 16:53:56,617 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 162 [2018-12-03 16:53:56,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:53:56,618 INFO L225 Difference]: With dead ends: 171 [2018-12-03 16:53:56,618 INFO L226 Difference]: Without dead ends: 169 [2018-12-03 16:53:56,619 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 16:53:56,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-12-03 16:53:56,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 165. [2018-12-03 16:53:56,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-12-03 16:53:56,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 166 transitions. [2018-12-03 16:53:56,681 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 166 transitions. Word has length 162 [2018-12-03 16:53:56,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:53:56,681 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 166 transitions. [2018-12-03 16:53:56,682 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 16:53:56,682 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 166 transitions. [2018-12-03 16:53:56,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-12-03 16:53:56,682 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:53:56,682 INFO L402 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1] [2018-12-03 16:53:56,682 INFO L423 AbstractCegarLoop]: === Iteration 107 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:53:56,682 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:53:56,683 INFO L82 PathProgramCache]: Analyzing trace with hash 1843761522, now seen corresponding path program 105 times [2018-12-03 16:53:56,683 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:53:56,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:56,683 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:53:56,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:56,683 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:53:56,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:00,815 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 16:54:00,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:00,816 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:54:00,816 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:54:00,816 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:54:00,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:00,816 INFO 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 16:54:00,824 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:54:00,825 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:54:00,940 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:54:00,941 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:54:00,951 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:54:08,583 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 16:54:08,584 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:54:12,406 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 16:54:12,425 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:54:12,425 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [109, 109, 109] total 217 [2018-12-03 16:54:12,425 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:54:12,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 218 states [2018-12-03 16:54:12,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 218 interpolants. [2018-12-03 16:54:12,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9127, Invalid=38179, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 16:54:12,428 INFO L87 Difference]: Start difference. First operand 165 states and 166 transitions. Second operand 218 states. [2018-12-03 16:54:21,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:54:21,073 INFO L93 Difference]: Finished difference Result 277 states and 279 transitions. [2018-12-03 16:54:21,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2018-12-03 16:54:21,073 INFO L78 Accepts]: Start accepts. Automaton has 218 states. Word has length 164 [2018-12-03 16:54:21,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:54:21,073 INFO L225 Difference]: With dead ends: 277 [2018-12-03 16:54:21,073 INFO L226 Difference]: Without dead ends: 166 [2018-12-03 16:54:21,076 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 112 SyntacticMatches, 107 SemanticMatches, 270 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40070 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=13744, Invalid=59968, Unknown=0, NotChecked=0, Total=73712 [2018-12-03 16:54:21,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-03 16:54:21,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2018-12-03 16:54:21,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-12-03 16:54:21,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2018-12-03 16:54:21,143 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 164 [2018-12-03 16:54:21,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:54:21,143 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2018-12-03 16:54:21,143 INFO L481 AbstractCegarLoop]: Interpolant automaton has 218 states. [2018-12-03 16:54:21,143 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2018-12-03 16:54:21,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-12-03 16:54:21,144 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:54:21,144 INFO L402 BasicCegarLoop]: trace histogram [54, 54, 53, 1, 1, 1, 1] [2018-12-03 16:54:21,144 INFO L423 AbstractCegarLoop]: === Iteration 108 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:54:21,144 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:54:21,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1318614313, now seen corresponding path program 106 times [2018-12-03 16:54:21,145 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:54:21,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:21,145 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:54:21,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:21,146 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:54:21,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:22,475 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 16:54:22,475 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:22,476 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:54:22,476 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:54:22,476 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:54:22,476 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:22,476 INFO 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 16:54:22,484 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:54:22,485 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:54:22,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:22,619 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:54:22,693 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 16:54:22,693 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:54:25,059 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 16:54:25,079 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:54:25,079 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57, 57] total 59 [2018-12-03 16:54:25,079 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:54:25,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-12-03 16:54:25,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-12-03 16:54:25,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1658, Invalid=1882, Unknown=0, NotChecked=0, Total=3540 [2018-12-03 16:54:25,080 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand 60 states. [2018-12-03 16:54:26,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:54:26,596 INFO L93 Difference]: Finished difference Result 174 states and 175 transitions. [2018-12-03 16:54:26,596 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2018-12-03 16:54:26,597 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 165 [2018-12-03 16:54:26,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:54:26,597 INFO L225 Difference]: With dead ends: 174 [2018-12-03 16:54:26,597 INFO L226 Difference]: Without dead ends: 172 [2018-12-03 16:54:26,598 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 16:54:26,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-12-03 16:54:26,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 168. [2018-12-03 16:54:26,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-12-03 16:54:26,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 169 transitions. [2018-12-03 16:54:26,664 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 169 transitions. Word has length 165 [2018-12-03 16:54:26,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:54:26,665 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 169 transitions. [2018-12-03 16:54:26,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-12-03 16:54:26,665 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 169 transitions. [2018-12-03 16:54:26,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-12-03 16:54:26,665 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:54:26,665 INFO L402 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1] [2018-12-03 16:54:26,665 INFO L423 AbstractCegarLoop]: === Iteration 109 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:54:26,666 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:54:26,666 INFO L82 PathProgramCache]: Analyzing trace with hash 173054787, now seen corresponding path program 107 times [2018-12-03 16:54:26,666 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:54:26,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:26,666 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:54:26,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:26,666 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:54:26,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:30,882 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 16:54:30,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:30,882 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:54:30,882 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:54:30,882 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:54:30,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:30,883 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:54:30,890 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:54:30,890 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:54:31,160 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2018-12-03 16:54:31,161 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:54:31,169 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:54:39,139 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 16:54:39,139 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:54:43,083 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 16:54:43,102 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:54:43,102 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 111, 111] total 221 [2018-12-03 16:54:43,102 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:54:43,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 222 states [2018-12-03 16:54:43,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 222 interpolants. [2018-12-03 16:54:43,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9461, Invalid=39601, Unknown=0, NotChecked=0, Total=49062 [2018-12-03 16:54:43,105 INFO L87 Difference]: Start difference. First operand 168 states and 169 transitions. Second operand 222 states. [2018-12-03 16:54:50,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:54:50,565 INFO L93 Difference]: Finished difference Result 282 states and 284 transitions. [2018-12-03 16:54:50,565 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2018-12-03 16:54:50,566 INFO L78 Accepts]: Start accepts. Automaton has 222 states. Word has length 167 [2018-12-03 16:54:50,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:54:50,566 INFO L225 Difference]: With dead ends: 282 [2018-12-03 16:54:50,566 INFO L226 Difference]: Without dead ends: 169 [2018-12-03 16:54:50,568 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 114 SyntacticMatches, 109 SemanticMatches, 275 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41582 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=14246, Invalid=62206, Unknown=0, NotChecked=0, Total=76452 [2018-12-03 16:54:50,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-12-03 16:54:50,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-12-03 16:54:50,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-12-03 16:54:50,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-12-03 16:54:50,637 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 167 [2018-12-03 16:54:50,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:54:50,637 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-12-03 16:54:50,637 INFO L481 AbstractCegarLoop]: Interpolant automaton has 222 states. [2018-12-03 16:54:50,637 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-12-03 16:54:50,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-12-03 16:54:50,638 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:54:50,638 INFO L402 BasicCegarLoop]: trace histogram [55, 55, 54, 1, 1, 1, 1] [2018-12-03 16:54:50,638 INFO L423 AbstractCegarLoop]: === Iteration 110 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:54:50,638 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:54:50,639 INFO L82 PathProgramCache]: Analyzing trace with hash 2078410796, now seen corresponding path program 108 times [2018-12-03 16:54:50,639 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:54:50,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:50,639 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:54:50,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:50,640 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:54:50,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:52,036 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 16:54:52,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:52,036 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:54:52,036 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:54:52,036 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:54:52,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:52,036 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 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 16:54:52,044 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:54:52,045 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:54:52,188 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:54:52,188 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:54:52,195 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:54:52,272 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 16:54:52,272 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:54:54,510 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 16:54:54,530 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:54:54,530 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 60 [2018-12-03 16:54:54,531 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:54:54,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-12-03 16:54:54,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-12-03 16:54:54,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1716, Invalid=1944, Unknown=0, NotChecked=0, Total=3660 [2018-12-03 16:54:54,531 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 61 states. [2018-12-03 16:54:56,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:54:56,393 INFO L93 Difference]: Finished difference Result 177 states and 178 transitions. [2018-12-03 16:54:56,393 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2018-12-03 16:54:56,393 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 168 [2018-12-03 16:54:56,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:54:56,393 INFO L225 Difference]: With dead ends: 177 [2018-12-03 16:54:56,394 INFO L226 Difference]: Without dead ends: 175 [2018-12-03 16:54:56,394 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 278 SyntacticMatches, 110 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6327 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=5077, Invalid=8495, Unknown=0, NotChecked=0, Total=13572 [2018-12-03 16:54:56,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-12-03 16:54:56,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 171. [2018-12-03 16:54:56,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-12-03 16:54:56,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 172 transitions. [2018-12-03 16:54:56,459 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 172 transitions. Word has length 168 [2018-12-03 16:54:56,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:54:56,459 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 172 transitions. [2018-12-03 16:54:56,459 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-12-03 16:54:56,459 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 172 transitions. [2018-12-03 16:54:56,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-12-03 16:54:56,460 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:54:56,460 INFO L402 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1] [2018-12-03 16:54:56,460 INFO L423 AbstractCegarLoop]: === Iteration 111 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:54:56,460 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:54:56,460 INFO L82 PathProgramCache]: Analyzing trace with hash 193034630, now seen corresponding path program 109 times [2018-12-03 16:54:56,460 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:54:56,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:56,461 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:54:56,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:56,461 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:54:56,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:55:00,517 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 16:55:00,517 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:00,517 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:55:00,517 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:55:00,518 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:55:00,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:00,518 INFO 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 16:55:00,526 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:55:00,526 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:55:00,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:55:00,663 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:55:08,975 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 16:55:08,976 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:55:13,076 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 16:55:13,096 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:55:13,096 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [113, 113, 113] total 225 [2018-12-03 16:55:13,096 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:55:13,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 226 states [2018-12-03 16:55:13,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 226 interpolants. [2018-12-03 16:55:13,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9801, Invalid=41049, Unknown=0, NotChecked=0, Total=50850 [2018-12-03 16:55:13,099 INFO L87 Difference]: Start difference. First operand 171 states and 172 transitions. Second operand 226 states. [2018-12-03 16:55:20,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:55:20,614 INFO L93 Difference]: Finished difference Result 287 states and 289 transitions. [2018-12-03 16:55:20,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2018-12-03 16:55:20,614 INFO L78 Accepts]: Start accepts. Automaton has 226 states. Word has length 170 [2018-12-03 16:55:20,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:55:20,615 INFO L225 Difference]: With dead ends: 287 [2018-12-03 16:55:20,615 INFO L226 Difference]: Without dead ends: 172 [2018-12-03 16:55:20,616 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 116 SyntacticMatches, 111 SemanticMatches, 280 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43122 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=14757, Invalid=64485, Unknown=0, NotChecked=0, Total=79242 [2018-12-03 16:55:20,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-12-03 16:55:20,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2018-12-03 16:55:20,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-12-03 16:55:20,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2018-12-03 16:55:20,682 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 170 [2018-12-03 16:55:20,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:55:20,682 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2018-12-03 16:55:20,682 INFO L481 AbstractCegarLoop]: Interpolant automaton has 226 states. [2018-12-03 16:55:20,682 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2018-12-03 16:55:20,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-12-03 16:55:20,682 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:55:20,682 INFO L402 BasicCegarLoop]: trace histogram [56, 56, 55, 1, 1, 1, 1] [2018-12-03 16:55:20,683 INFO L423 AbstractCegarLoop]: === Iteration 112 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:55:20,683 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:55:20,683 INFO L82 PathProgramCache]: Analyzing trace with hash 366114813, now seen corresponding path program 110 times [2018-12-03 16:55:20,683 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:55:20,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:20,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:55:20,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:20,684 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:55:20,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:55:22,417 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 16:55:22,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:22,418 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:55:22,418 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:55:22,418 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:55:22,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:22,418 INFO 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 16:55:22,427 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:55:22,427 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:55:22,711 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 56 check-sat command(s) [2018-12-03 16:55:22,711 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:55:22,716 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:55:22,798 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 16:55:22,798 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:55:25,080 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 16:55:25,101 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:55:25,101 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 59, 59] total 61 [2018-12-03 16:55:25,101 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:55:25,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-12-03 16:55:25,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-12-03 16:55:25,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1775, Invalid=2007, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 16:55:25,102 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand 62 states. [2018-12-03 16:55:26,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:55:26,998 INFO L93 Difference]: Finished difference Result 180 states and 181 transitions. [2018-12-03 16:55:26,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2018-12-03 16:55:26,999 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 171 [2018-12-03 16:55:26,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:55:26,999 INFO L225 Difference]: With dead ends: 180 [2018-12-03 16:55:26,999 INFO L226 Difference]: Without dead ends: 178 [2018-12-03 16:55:27,001 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 283 SyntacticMatches, 112 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6554 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=5253, Invalid=8789, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 16:55:27,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-12-03 16:55:27,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 174. [2018-12-03 16:55:27,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-12-03 16:55:27,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 175 transitions. [2018-12-03 16:55:27,068 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 175 transitions. Word has length 171 [2018-12-03 16:55:27,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:55:27,069 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 175 transitions. [2018-12-03 16:55:27,069 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-12-03 16:55:27,069 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 175 transitions. [2018-12-03 16:55:27,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-12-03 16:55:27,069 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:55:27,069 INFO L402 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1] [2018-12-03 16:55:27,069 INFO L423 AbstractCegarLoop]: === Iteration 113 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:55:27,070 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:55:27,070 INFO L82 PathProgramCache]: Analyzing trace with hash -350930665, now seen corresponding path program 111 times [2018-12-03 16:55:27,070 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:55:27,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:27,070 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:55:27,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:27,070 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:55:27,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:55:31,344 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 16:55:31,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:31,345 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:55:31,345 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:55:31,345 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:55:31,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:31,345 INFO 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 16:55:31,354 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:55:31,355 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:55:31,495 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:55:31,495 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:55:31,503 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:55:40,206 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 16:55:40,206 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:55:44,534 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 16:55:44,554 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:55:44,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 115, 115] total 229 [2018-12-03 16:55:44,554 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:55:44,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 230 states [2018-12-03 16:55:44,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 230 interpolants. [2018-12-03 16:55:44,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10147, Invalid=42523, Unknown=0, NotChecked=0, Total=52670 [2018-12-03 16:55:44,556 INFO L87 Difference]: Start difference. First operand 174 states and 175 transitions. Second operand 230 states. [2018-12-03 16:55:54,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:55:54,042 INFO L93 Difference]: Finished difference Result 292 states and 294 transitions. [2018-12-03 16:55:54,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2018-12-03 16:55:54,042 INFO L78 Accepts]: Start accepts. Automaton has 230 states. Word has length 173 [2018-12-03 16:55:54,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:55:54,042 INFO L225 Difference]: With dead ends: 292 [2018-12-03 16:55:54,042 INFO L226 Difference]: Without dead ends: 175 [2018-12-03 16:55:54,044 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 118 SyntacticMatches, 113 SemanticMatches, 285 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44690 ImplicationChecksByTransitivity, 19.9s TimeCoverageRelationStatistics Valid=15277, Invalid=66805, Unknown=0, NotChecked=0, Total=82082 [2018-12-03 16:55:54,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-12-03 16:55:54,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2018-12-03 16:55:54,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-12-03 16:55:54,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 176 transitions. [2018-12-03 16:55:54,108 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 176 transitions. Word has length 173 [2018-12-03 16:55:54,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:55:54,108 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 176 transitions. [2018-12-03 16:55:54,108 INFO L481 AbstractCegarLoop]: Interpolant automaton has 230 states. [2018-12-03 16:55:54,109 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 176 transitions. [2018-12-03 16:55:54,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-12-03 16:55:54,109 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:55:54,109 INFO L402 BasicCegarLoop]: trace histogram [57, 57, 56, 1, 1, 1, 1] [2018-12-03 16:55:54,109 INFO L423 AbstractCegarLoop]: === Iteration 114 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:55:54,109 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:55:54,109 INFO L82 PathProgramCache]: Analyzing trace with hash 1920045888, now seen corresponding path program 112 times [2018-12-03 16:55:54,109 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:55:54,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:54,110 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:55:54,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:54,110 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:55:54,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:55:55,560 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 16:55:55,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:55,560 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:55:55,560 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:55:55,560 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:55:55,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:55,561 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 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 16:55:55,569 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:55:55,569 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:55:55,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:55:55,743 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:55:55,823 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 16:55:55,824 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:55:58,486 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 16:55:58,505 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:55:58,506 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60, 60] total 62 [2018-12-03 16:55:58,506 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:55:58,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 16:55:58,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 16:55:58,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1835, Invalid=2071, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 16:55:58,507 INFO L87 Difference]: Start difference. First operand 175 states and 176 transitions. Second operand 63 states. [2018-12-03 16:56:00,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:56:00,163 INFO L93 Difference]: Finished difference Result 183 states and 184 transitions. [2018-12-03 16:56:00,163 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2018-12-03 16:56:00,163 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 174 [2018-12-03 16:56:00,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:56:00,164 INFO L225 Difference]: With dead ends: 183 [2018-12-03 16:56:00,164 INFO L226 Difference]: Without dead ends: 181 [2018-12-03 16:56:00,165 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 521 GetRequests, 288 SyntacticMatches, 114 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6785 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=5432, Invalid=9088, Unknown=0, NotChecked=0, Total=14520 [2018-12-03 16:56:00,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-12-03 16:56:00,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 177. [2018-12-03 16:56:00,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-12-03 16:56:00,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 178 transitions. [2018-12-03 16:56:00,236 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 178 transitions. Word has length 174 [2018-12-03 16:56:00,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:56:00,237 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 178 transitions. [2018-12-03 16:56:00,237 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 16:56:00,237 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 178 transitions. [2018-12-03 16:56:00,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-12-03 16:56:00,237 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:56:00,237 INFO L402 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1] [2018-12-03 16:56:00,237 INFO L423 AbstractCegarLoop]: === Iteration 115 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:56:00,237 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:56:00,238 INFO L82 PathProgramCache]: Analyzing trace with hash -1671786598, now seen corresponding path program 113 times [2018-12-03 16:56:00,238 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:56:00,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:00,238 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:56:00,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:00,238 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:56:00,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:04,796 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 16:56:04,796 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:04,797 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:56:04,797 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:56:04,797 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:56:04,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:04,797 INFO 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 16:56:04,806 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:56:04,806 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:56:05,119 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2018-12-03 16:56:05,119 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:56:05,126 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:56:14,286 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 16:56:14,287 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:56:18,695 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 16:56:18,715 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:56:18,715 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 233 [2018-12-03 16:56:18,715 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:56:18,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 234 states [2018-12-03 16:56:18,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 234 interpolants. [2018-12-03 16:56:18,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10499, Invalid=44023, Unknown=0, NotChecked=0, Total=54522 [2018-12-03 16:56:18,717 INFO L87 Difference]: Start difference. First operand 177 states and 178 transitions. Second operand 234 states. [2018-12-03 16:56:23,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:56:23,704 INFO L93 Difference]: Finished difference Result 297 states and 299 transitions. [2018-12-03 16:56:23,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2018-12-03 16:56:23,704 INFO L78 Accepts]: Start accepts. Automaton has 234 states. Word has length 176 [2018-12-03 16:56:23,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:56:23,705 INFO L225 Difference]: With dead ends: 297 [2018-12-03 16:56:23,705 INFO L226 Difference]: Without dead ends: 178 [2018-12-03 16:56:23,707 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 525 GetRequests, 120 SyntacticMatches, 115 SemanticMatches, 290 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46286 ImplicationChecksByTransitivity, 20.8s TimeCoverageRelationStatistics Valid=15806, Invalid=69166, Unknown=0, NotChecked=0, Total=84972 [2018-12-03 16:56:23,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-12-03 16:56:23,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-12-03 16:56:23,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-12-03 16:56:23,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 179 transitions. [2018-12-03 16:56:23,776 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 179 transitions. Word has length 176 [2018-12-03 16:56:23,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:56:23,777 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 179 transitions. [2018-12-03 16:56:23,777 INFO L481 AbstractCegarLoop]: Interpolant automaton has 234 states. [2018-12-03 16:56:23,777 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 179 transitions. [2018-12-03 16:56:23,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-12-03 16:56:23,777 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:56:23,777 INFO L402 BasicCegarLoop]: trace histogram [58, 58, 57, 1, 1, 1, 1] [2018-12-03 16:56:23,777 INFO L423 AbstractCegarLoop]: === Iteration 116 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:56:23,778 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:56:23,778 INFO L82 PathProgramCache]: Analyzing trace with hash -1334142767, now seen corresponding path program 114 times [2018-12-03 16:56:23,778 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:56:23,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:23,778 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:56:23,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:23,778 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:56:23,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:25,285 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 16:56:25,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:25,286 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:56:25,286 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:56:25,286 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:56:25,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:25,286 INFO 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 16:56:25,296 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:56:25,296 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:56:25,445 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:56:25,445 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:56:25,452 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:56:25,534 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 16:56:25,535 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:56:28,248 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 16:56:28,268 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:56:28,268 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 61, 61] total 63 [2018-12-03 16:56:28,268 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:56:28,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-12-03 16:56:28,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-12-03 16:56:28,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1896, Invalid=2136, Unknown=0, NotChecked=0, Total=4032 [2018-12-03 16:56:28,269 INFO L87 Difference]: Start difference. First operand 178 states and 179 transitions. Second operand 64 states. [2018-12-03 16:56:29,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:56:29,971 INFO L93 Difference]: Finished difference Result 186 states and 187 transitions. [2018-12-03 16:56:29,971 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-12-03 16:56:29,972 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 177 [2018-12-03 16:56:29,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:56:29,972 INFO L225 Difference]: With dead ends: 186 [2018-12-03 16:56:29,972 INFO L226 Difference]: Without dead ends: 184 [2018-12-03 16:56:29,973 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 293 SyntacticMatches, 116 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7020 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=5614, Invalid=9392, Unknown=0, NotChecked=0, Total=15006 [2018-12-03 16:56:29,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-12-03 16:56:30,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 180. [2018-12-03 16:56:30,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-12-03 16:56:30,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 181 transitions. [2018-12-03 16:56:30,045 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 181 transitions. Word has length 177 [2018-12-03 16:56:30,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:56:30,045 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 181 transitions. [2018-12-03 16:56:30,045 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-12-03 16:56:30,045 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 181 transitions. [2018-12-03 16:56:30,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-12-03 16:56:30,046 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:56:30,046 INFO L402 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1] [2018-12-03 16:56:30,046 INFO L423 AbstractCegarLoop]: === Iteration 117 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:56:30,046 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:56:30,046 INFO L82 PathProgramCache]: Analyzing trace with hash 2084074731, now seen corresponding path program 115 times [2018-12-03 16:56:30,046 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:56:30,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:30,047 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:56:30,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:30,047 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:56:30,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:34,781 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 16:56:34,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:34,781 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:56:34,782 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:56:34,782 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:56:34,782 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:34,782 INFO 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 16:56:34,791 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:56:34,791 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:56:34,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:34,936 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:56:44,324 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 16:56:44,325 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:56:48,841 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 16:56:48,861 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:56:48,861 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [119, 119, 119] total 237 [2018-12-03 16:56:48,861 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:56:48,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 238 states [2018-12-03 16:56:48,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 238 interpolants. [2018-12-03 16:56:48,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10857, Invalid=45549, Unknown=0, NotChecked=0, Total=56406 [2018-12-03 16:56:48,864 INFO L87 Difference]: Start difference. First operand 180 states and 181 transitions. Second operand 238 states. [2018-12-03 16:56:55,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:56:55,540 INFO L93 Difference]: Finished difference Result 302 states and 304 transitions. [2018-12-03 16:56:55,540 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2018-12-03 16:56:55,540 INFO L78 Accepts]: Start accepts. Automaton has 238 states. Word has length 179 [2018-12-03 16:56:55,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:56:55,540 INFO L225 Difference]: With dead ends: 302 [2018-12-03 16:56:55,541 INFO L226 Difference]: Without dead ends: 181 [2018-12-03 16:56:55,543 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 534 GetRequests, 122 SyntacticMatches, 117 SemanticMatches, 295 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47910 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=16344, Invalid=71568, Unknown=0, NotChecked=0, Total=87912 [2018-12-03 16:56:55,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-12-03 16:56:55,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 181. [2018-12-03 16:56:55,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-12-03 16:56:55,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 182 transitions. [2018-12-03 16:56:55,619 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 182 transitions. Word has length 179 [2018-12-03 16:56:55,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:56:55,619 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 182 transitions. [2018-12-03 16:56:55,619 INFO L481 AbstractCegarLoop]: Interpolant automaton has 238 states. [2018-12-03 16:56:55,619 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 182 transitions. [2018-12-03 16:56:55,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2018-12-03 16:56:55,620 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:56:55,620 INFO L402 BasicCegarLoop]: trace histogram [59, 59, 58, 1, 1, 1, 1] [2018-12-03 16:56:55,620 INFO L423 AbstractCegarLoop]: === Iteration 118 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:56:55,621 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:56:55,621 INFO L82 PathProgramCache]: Analyzing trace with hash 2018036820, now seen corresponding path program 116 times [2018-12-03 16:56:55,621 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:56:55,621 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:55,621 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:56:55,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:55,622 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:56:55,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:57,175 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 16:56:57,175 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:57,175 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:56:57,176 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:56:57,176 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:56:57,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:57,176 INFO 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 16:56:57,185 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:56:57,185 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:56:57,508 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2018-12-03 16:56:57,508 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:56:57,514 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:56:57,600 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 16:56:57,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:57:00,344 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 16:57:00,364 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:57:00,364 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 64 [2018-12-03 16:57:00,364 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:57:00,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 16:57:00,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 16:57:00,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1958, Invalid=2202, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 16:57:00,365 INFO L87 Difference]: Start difference. First operand 181 states and 182 transitions. Second operand 65 states. [2018-12-03 16:57:02,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:57:02,116 INFO L93 Difference]: Finished difference Result 189 states and 190 transitions. [2018-12-03 16:57:02,117 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2018-12-03 16:57:02,117 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 180 [2018-12-03 16:57:02,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:57:02,117 INFO L225 Difference]: With dead ends: 189 [2018-12-03 16:57:02,117 INFO L226 Difference]: Without dead ends: 187 [2018-12-03 16:57:02,119 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 539 GetRequests, 298 SyntacticMatches, 118 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7259 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=5799, Invalid=9701, Unknown=0, NotChecked=0, Total=15500 [2018-12-03 16:57:02,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-12-03 16:57:02,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 183. [2018-12-03 16:57:02,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-12-03 16:57:02,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 184 transitions. [2018-12-03 16:57:02,192 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 184 transitions. Word has length 180 [2018-12-03 16:57:02,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:57:02,192 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 184 transitions. [2018-12-03 16:57:02,193 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 16:57:02,193 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 184 transitions. [2018-12-03 16:57:02,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-12-03 16:57:02,193 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:57:02,193 INFO L402 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1] [2018-12-03 16:57:02,193 INFO L423 AbstractCegarLoop]: === Iteration 119 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:57:02,193 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:57:02,194 INFO L82 PathProgramCache]: Analyzing trace with hash -1991781458, now seen corresponding path program 117 times [2018-12-03 16:57:02,194 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:57:02,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:57:02,194 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:57:02,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:57:02,194 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:57:02,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:57:07,097 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 16:57:07,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:57:07,097 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:57:07,097 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:57:07,097 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:57:07,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:57:07,097 INFO 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 16:57:07,106 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:57:07,106 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:57:07,256 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:57:07,256 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:57:07,266 INFO L273 TraceCheckSpWp]: Computing forward predicates...