java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf -i ../../../trunk/examples/programs/20170319-ConjunctivePathPrograms/count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 18:46:48,623 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 18:46:48,625 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 18:46:48,643 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 18:46:48,643 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 18:46:48,644 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 18:46:48,646 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 18:46:48,649 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 18:46:48,651 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 18:46:48,657 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 18:46:48,658 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-12-03 18:46:48,698 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf [2018-12-03 18:46:48,711 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 18:46:48,711 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 18:46:48,712 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 18:46:48,712 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 18:46:48,712 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 18:46:48,712 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 18:46:48,713 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 18:46:48,713 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 18:46:48,713 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 18:46:48,713 INFO L133 SettingsManager]: * Underlying domain=OctagonDomain [2018-12-03 18:46:48,713 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 18:46:48,714 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 18:46:48,714 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 18:46:48,714 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 18:46:48,715 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 18:46:48,715 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 18:46:48,715 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 18:46:48,715 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 18:46:48,715 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 18:46:48,716 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 18:46:48,716 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 18:46:48,716 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 18:46:48,716 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 18:46:48,716 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 18:46:48,717 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 18:46:48,717 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 18:46:48,717 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 18:46:48,717 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 18:46:48,717 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 18:46:48,718 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 18:46:48,718 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 18:46:48,718 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 18:46:48,718 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 18:46:48,718 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 18:46:48,719 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 18:46:48,719 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 18:46:48,719 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 18:46:48,719 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 18:46:48,719 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 18:46:48,720 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 18:46:48,772 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 18:46:48,787 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 18:46:48,793 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 18:46:48,795 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 18:46:48,795 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 18:46:48,796 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170319-ConjunctivePathPrograms/count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl [2018-12-03 18:46:48,796 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170319-ConjunctivePathPrograms/count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl' [2018-12-03 18:46:48,833 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 18:46:48,835 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 18:46:48,835 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 18:46:48,835 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 18:46:48,836 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 18:46:48,852 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:46:48" (1/1) ... [2018-12-03 18:46:48,861 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:46:48" (1/1) ... [2018-12-03 18:46:48,869 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 18:46:48,870 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 18:46:48,870 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 18:46:48,871 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 18:46:48,882 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:46:48" (1/1) ... [2018-12-03 18:46:48,883 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:46:48" (1/1) ... [2018-12-03 18:46:48,884 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:46:48" (1/1) ... [2018-12-03 18:46:48,884 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:46:48" (1/1) ... [2018-12-03 18:46:48,887 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:46:48" (1/1) ... [2018-12-03 18:46:48,889 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:46:48" (1/1) ... [2018-12-03 18:46:48,890 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:46:48" (1/1) ... [2018-12-03 18:46:48,891 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 18:46:48,892 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 18:46:48,892 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 18:46:48,892 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 18:46:48,893 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:46:48" (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 18:46:48,960 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2018-12-03 18:46:48,961 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 18:46:48,961 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 18:46:49,195 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 18:46:49,195 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-03 18:46:49,199 INFO L202 PluginConnector]: Adding new model count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 06:46:49 BoogieIcfgContainer [2018-12-03 18:46:49,199 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 18:46:49,200 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 18:46:49,200 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 18:46:49,204 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 18:46:49,205 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:46:48" (1/2) ... [2018-12-03 18:46:49,206 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6384f953 and model type count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 06:46:49, skipping insertion in model container [2018-12-03 18:46:49,206 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 06:46:49" (2/2) ... [2018-12-03 18:46:49,209 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl [2018-12-03 18:46:49,218 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 18:46:49,224 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 18:46:49,239 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 18:46:49,269 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 18:46:49,270 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 18:46:49,270 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 18:46:49,270 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 18:46:49,270 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 18:46:49,270 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 18:46:49,271 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 18:46:49,271 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 18:46:49,286 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-12-03 18:46:49,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-12-03 18:46:49,293 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:46:49,293 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-12-03 18:46:49,296 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:46:49,302 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:46:49,302 INFO L82 PathProgramCache]: Analyzing trace with hash 30017, now seen corresponding path program 1 times [2018-12-03 18:46:49,305 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:46:49,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:49,346 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:46:49,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:49,347 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:46:49,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:46:49,524 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 18:46:49,528 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 18:46:49,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-03 18:46:49,529 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 18:46:49,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 18:46:49,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 18:46:49,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 18:46:49,548 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-12-03 18:46:49,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:46:49,595 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 18:46:49,595 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 18:46:49,597 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-12-03 18:46:49,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:46:49,607 INFO L225 Difference]: With dead ends: 9 [2018-12-03 18:46:49,608 INFO L226 Difference]: Without dead ends: 5 [2018-12-03 18:46:49,612 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 18:46:49,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-12-03 18:46:49,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-12-03 18:46:49,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-12-03 18:46:49,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 5 transitions. [2018-12-03 18:46:49,648 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 5 transitions. Word has length 3 [2018-12-03 18:46:49,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:46:49,648 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 5 transitions. [2018-12-03 18:46:49,648 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 18:46:49,649 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-12-03 18:46:49,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-03 18:46:49,649 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:46:49,649 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-03 18:46:49,649 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:46:49,650 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:46:49,650 INFO L82 PathProgramCache]: Analyzing trace with hash 928552, now seen corresponding path program 1 times [2018-12-03 18:46:49,650 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:46:49,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:49,651 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:46:49,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:49,652 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:46:49,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:46:49,737 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:49,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:49,738 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:46:49,739 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 5 with the following transitions: [2018-12-03 18:46:49,741 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9] [2018-12-03 18:46:49,836 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 18:46:49,836 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 18:46:50,151 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 18:46:50,152 INFO L272 AbstractInterpreter]: Visited 4 different actions 25 times. Merged at 3 different actions 21 times. Widened at 2 different actions 7 times. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 18:46:50,206 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:46:50,207 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 18:46:50,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:50,208 INFO 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 18:46:50,221 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:46:50,221 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:46:50,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:46:50,252 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:46:50,309 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:50,310 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:46:50,401 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:50,420 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:46:50,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2018-12-03 18:46:50,421 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:46:50,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 18:46:50,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 18:46:50,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-12-03 18:46:50,422 INFO L87 Difference]: Start difference. First operand 5 states and 5 transitions. Second operand 5 states. [2018-12-03 18:46:50,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:46:50,484 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 18:46:50,485 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 18:46:50,485 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 4 [2018-12-03 18:46:50,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:46:50,485 INFO L225 Difference]: With dead ends: 9 [2018-12-03 18:46:50,486 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 18:46:50,487 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-12-03 18:46:50,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 18:46:50,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 18:46:50,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 18:46:50,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-12-03 18:46:50,490 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-12-03 18:46:50,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:46:50,490 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-12-03 18:46:50,490 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 18:46:50,491 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-12-03 18:46:50,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 18:46:50,491 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:46:50,491 INFO L402 BasicCegarLoop]: trace histogram [3, 1, 1, 1] [2018-12-03 18:46:50,492 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:46:50,492 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:46:50,492 INFO L82 PathProgramCache]: Analyzing trace with hash 892275272, now seen corresponding path program 2 times [2018-12-03 18:46:50,492 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:46:50,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:50,494 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:46:50,494 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:50,494 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:46:50,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:46:50,594 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:50,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:50,595 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:46:50,595 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:46:50,596 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:46:50,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:50,596 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:46:50,606 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:46:50,607 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:46:50,628 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 18:46:50,628 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:46:50,630 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:46:50,748 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:50,748 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:46:50,928 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:50,949 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:46:50,949 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-12-03 18:46:50,949 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:46:50,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 18:46:50,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 18:46:50,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2018-12-03 18:46:50,951 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 7 states. [2018-12-03 18:46:51,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:46:51,336 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-12-03 18:46:51,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 18:46:51,337 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 6 [2018-12-03 18:46:51,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:46:51,338 INFO L225 Difference]: With dead ends: 11 [2018-12-03 18:46:51,338 INFO L226 Difference]: Without dead ends: 9 [2018-12-03 18:46:51,339 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2018-12-03 18:46:51,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-12-03 18:46:51,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-12-03 18:46:51,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 18:46:51,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-12-03 18:46:51,343 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-12-03 18:46:51,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:46:51,343 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-12-03 18:46:51,343 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 18:46:51,343 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-12-03 18:46:51,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 18:46:51,344 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:46:51,344 INFO L402 BasicCegarLoop]: trace histogram [5, 1, 1, 1] [2018-12-03 18:46:51,345 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:46:51,345 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:46:51,345 INFO L82 PathProgramCache]: Analyzing trace with hash -1516986008, now seen corresponding path program 3 times [2018-12-03 18:46:51,345 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:46:51,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:51,347 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:46:51,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:51,347 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:46:51,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:46:51,482 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:51,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:51,483 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:46:51,484 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:46:51,484 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:46:51,484 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:51,485 INFO 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 18:46:51,502 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:46:51,502 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:46:51,536 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:46:51,536 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:46:51,538 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:46:51,630 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:51,630 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:46:52,207 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:52,227 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:46:52,227 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2018-12-03 18:46:52,227 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:46:52,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 18:46:52,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 18:46:52,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=145, Unknown=0, NotChecked=0, Total=210 [2018-12-03 18:46:52,231 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 9 states. [2018-12-03 18:46:52,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:46:52,420 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2018-12-03 18:46:52,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 18:46:52,421 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 8 [2018-12-03 18:46:52,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:46:52,422 INFO L225 Difference]: With dead ends: 13 [2018-12-03 18:46:52,422 INFO L226 Difference]: Without dead ends: 11 [2018-12-03 18:46:52,423 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=129, Invalid=251, Unknown=0, NotChecked=0, Total=380 [2018-12-03 18:46:52,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-12-03 18:46:52,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-12-03 18:46:52,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-12-03 18:46:52,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-12-03 18:46:52,428 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-12-03 18:46:52,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:46:52,428 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-12-03 18:46:52,429 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 18:46:52,429 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-12-03 18:46:52,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 18:46:52,430 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:46:52,430 INFO L402 BasicCegarLoop]: trace histogram [7, 1, 1, 1] [2018-12-03 18:46:52,430 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:46:52,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:46:52,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1829703544, now seen corresponding path program 4 times [2018-12-03 18:46:52,431 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:46:52,432 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:52,432 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:46:52,432 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:52,432 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:46:52,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:46:52,707 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:52,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:52,707 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:46:52,707 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:46:52,708 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:46:52,708 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:52,708 INFO 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 18:46:52,717 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:46:52,717 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:46:52,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:46:52,727 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:46:52,787 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:52,787 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:46:53,231 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:53,252 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:46:53,252 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2018-12-03 18:46:53,252 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:46:53,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 18:46:53,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 18:46:53,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2018-12-03 18:46:53,254 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 11 states. [2018-12-03 18:46:53,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:46:53,512 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2018-12-03 18:46:53,513 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 18:46:53,513 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 10 [2018-12-03 18:46:53,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:46:53,514 INFO L225 Difference]: With dead ends: 15 [2018-12-03 18:46:53,514 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 18:46:53,514 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2018-12-03 18:46:53,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 18:46:53,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-12-03 18:46:53,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-12-03 18:46:53,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-12-03 18:46:53,519 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-12-03 18:46:53,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:46:53,519 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-12-03 18:46:53,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 18:46:53,520 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-12-03 18:46:53,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 18:46:53,520 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:46:53,520 INFO L402 BasicCegarLoop]: trace histogram [9, 1, 1, 1] [2018-12-03 18:46:53,521 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:46:53,521 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:46:53,521 INFO L82 PathProgramCache]: Analyzing trace with hash -1703544920, now seen corresponding path program 5 times [2018-12-03 18:46:53,521 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:46:53,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:53,523 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:46:53,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:53,523 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:46:53,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:46:53,995 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:53,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:53,995 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:46:53,996 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:46:53,996 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:46:53,996 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:53,996 INFO 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 18:46:54,005 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:46:54,005 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:46:54,017 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 18:46:54,017 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:46:54,019 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:46:54,147 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:54,147 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:46:54,401 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:54,419 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:46:54,420 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-12-03 18:46:54,420 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:46:54,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 18:46:54,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 18:46:54,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=303, Unknown=0, NotChecked=0, Total=462 [2018-12-03 18:46:54,421 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 13 states. [2018-12-03 18:46:54,635 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 11 [2018-12-03 18:46:54,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:46:54,797 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2018-12-03 18:46:54,797 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 18:46:54,797 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 12 [2018-12-03 18:46:54,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:46:54,798 INFO L225 Difference]: With dead ends: 17 [2018-12-03 18:46:54,798 INFO L226 Difference]: Without dead ends: 15 [2018-12-03 18:46:54,799 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=339, Invalid=591, Unknown=0, NotChecked=0, Total=930 [2018-12-03 18:46:54,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-12-03 18:46:54,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-12-03 18:46:54,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 18:46:54,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-12-03 18:46:54,803 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-12-03 18:46:54,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:46:54,803 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-12-03 18:46:54,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 18:46:54,804 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-12-03 18:46:54,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 18:46:54,804 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:46:54,804 INFO L402 BasicCegarLoop]: trace histogram [11, 1, 1, 1] [2018-12-03 18:46:54,805 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:46:54,805 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:46:54,805 INFO L82 PathProgramCache]: Analyzing trace with hash -724191544, now seen corresponding path program 6 times [2018-12-03 18:46:54,805 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:46:54,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:54,806 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:46:54,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:54,807 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:46:54,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:46:55,302 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:55,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:55,302 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:46:55,303 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:46:55,303 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:46:55,303 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:55,303 INFO 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 18:46:55,322 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:46:55,322 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:46:55,342 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:46:55,343 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:46:55,345 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:46:55,401 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:55,401 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:46:55,772 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:55,791 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:46:55,791 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2018-12-03 18:46:55,791 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:46:55,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 18:46:55,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 18:46:55,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=472, Unknown=0, NotChecked=0, Total=702 [2018-12-03 18:46:55,793 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 15 states. [2018-12-03 18:46:56,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:46:56,313 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2018-12-03 18:46:56,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 18:46:56,315 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 14 [2018-12-03 18:46:56,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:46:56,315 INFO L225 Difference]: With dead ends: 19 [2018-12-03 18:46:56,315 INFO L226 Difference]: Without dead ends: 17 [2018-12-03 18:46:56,317 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=504, Invalid=902, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 18:46:56,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-12-03 18:46:56,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-12-03 18:46:56,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-03 18:46:56,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-12-03 18:46:56,321 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-12-03 18:46:56,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:46:56,321 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-12-03 18:46:56,321 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 18:46:56,321 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-12-03 18:46:56,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 18:46:56,322 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:46:56,322 INFO L402 BasicCegarLoop]: trace histogram [13, 1, 1, 1] [2018-12-03 18:46:56,322 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:46:56,323 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:46:56,323 INFO L82 PathProgramCache]: Analyzing trace with hash -163435032, now seen corresponding path program 7 times [2018-12-03 18:46:56,323 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:46:56,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:56,324 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:46:56,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:56,324 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:46:56,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:46:56,567 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:56,567 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:56,567 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:46:56,567 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:46:56,568 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:46:56,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:56,568 INFO 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 18:46:56,580 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:46:56,580 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:46:56,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:46:56,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:46:56,726 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:56,726 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:46:57,152 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:57,171 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:46:57,172 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 30 [2018-12-03 18:46:57,172 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:46:57,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 18:46:57,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 18:46:57,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=621, Unknown=0, NotChecked=0, Total=930 [2018-12-03 18:46:57,174 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 17 states. [2018-12-03 18:46:57,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:46:57,701 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2018-12-03 18:46:57,701 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 18:46:57,702 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 16 [2018-12-03 18:46:57,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:46:57,703 INFO L225 Difference]: With dead ends: 21 [2018-12-03 18:46:57,703 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 18:46:57,705 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=685, Invalid=1207, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 18:46:57,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 18:46:57,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-12-03 18:46:57,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 18:46:57,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-12-03 18:46:57,710 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-12-03 18:46:57,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:46:57,710 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-12-03 18:46:57,710 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 18:46:57,711 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-12-03 18:46:57,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 18:46:57,711 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:46:57,711 INFO L402 BasicCegarLoop]: trace histogram [15, 1, 1, 1] [2018-12-03 18:46:57,712 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:46:57,712 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:46:57,712 INFO L82 PathProgramCache]: Analyzing trace with hash 1852661000, now seen corresponding path program 8 times [2018-12-03 18:46:57,712 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:46:57,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:57,713 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:46:57,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:46:57,714 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:46:57,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:46:58,384 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:58,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:58,384 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:46:58,385 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:46:58,385 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:46:58,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:46:58,385 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:46:58,396 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:46:58,396 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:46:58,424 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 18:46:58,424 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:46:58,426 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:46:58,480 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:58,480 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:46:59,232 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:46:59,252 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:46:59,253 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-12-03 18:46:59,253 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:46:59,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 18:46:59,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 18:46:59,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=396, Invalid=726, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 18:46:59,255 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 19 states. [2018-12-03 18:47:00,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:47:00,118 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2018-12-03 18:47:00,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 18:47:00,119 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 18 [2018-12-03 18:47:00,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:47:00,119 INFO L225 Difference]: With dead ends: 23 [2018-12-03 18:47:00,119 INFO L226 Difference]: Without dead ends: 21 [2018-12-03 18:47:00,120 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=876, Invalid=1476, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 18:47:00,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-12-03 18:47:00,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-12-03 18:47:00,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 18:47:00,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-12-03 18:47:00,125 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-12-03 18:47:00,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:47:00,126 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-12-03 18:47:00,126 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 18:47:00,126 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-12-03 18:47:00,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 18:47:00,132 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:47:00,132 INFO L402 BasicCegarLoop]: trace histogram [17, 1, 1, 1] [2018-12-03 18:47:00,132 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:47:00,133 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:47:00,133 INFO L82 PathProgramCache]: Analyzing trace with hash -2004270040, now seen corresponding path program 9 times [2018-12-03 18:47:00,133 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:47:00,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:00,134 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:47:00,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:00,134 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:47:00,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:00,422 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:00,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:00,423 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:47:00,423 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:47:00,423 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:47:00,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:00,424 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 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 18:47:00,432 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:47:00,433 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:47:00,450 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:47:00,451 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:47:00,457 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:47:00,504 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:00,505 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:47:01,207 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:01,225 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:47:01,225 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 38 [2018-12-03 18:47:01,226 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:47:01,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 18:47:01,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 18:47:01,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=503, Invalid=979, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 18:47:01,227 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 21 states. [2018-12-03 18:47:01,650 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 11 [2018-12-03 18:47:02,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:47:02,121 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-12-03 18:47:02,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 18:47:02,122 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 20 [2018-12-03 18:47:02,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:47:02,123 INFO L225 Difference]: With dead ends: 25 [2018-12-03 18:47:02,123 INFO L226 Difference]: Without dead ends: 23 [2018-12-03 18:47:02,125 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1131, Invalid=1949, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 18:47:02,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-03 18:47:02,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-12-03 18:47:02,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-12-03 18:47:02,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-12-03 18:47:02,130 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-12-03 18:47:02,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:47:02,130 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-12-03 18:47:02,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 18:47:02,130 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-12-03 18:47:02,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-12-03 18:47:02,131 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:47:02,131 INFO L402 BasicCegarLoop]: trace histogram [19, 1, 1, 1] [2018-12-03 18:47:02,131 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:47:02,132 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:47:02,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1958223032, now seen corresponding path program 10 times [2018-12-03 18:47:02,132 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:47:02,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:02,133 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:47:02,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:02,133 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:47:02,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:02,414 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:02,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:02,415 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:47:02,415 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:47:02,415 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:47:02,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:02,415 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 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 18:47:02,425 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:47:02,425 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:47:02,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:02,450 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:47:02,486 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:02,486 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:47:03,402 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:03,421 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:47:03,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 42 [2018-12-03 18:47:03,421 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:47:03,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 18:47:03,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 18:47:03,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=618, Invalid=1188, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 18:47:03,423 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 23 states. [2018-12-03 18:47:04,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:47:04,238 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2018-12-03 18:47:04,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 18:47:04,239 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 22 [2018-12-03 18:47:04,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:47:04,239 INFO L225 Difference]: With dead ends: 27 [2018-12-03 18:47:04,239 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 18:47:04,241 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1396, Invalid=2386, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 18:47:04,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 18:47:04,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-12-03 18:47:04,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 18:47:04,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-12-03 18:47:04,246 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-12-03 18:47:04,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:47:04,246 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-12-03 18:47:04,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 18:47:04,246 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-12-03 18:47:04,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 18:47:04,247 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:47:04,247 INFO L402 BasicCegarLoop]: trace histogram [21, 1, 1, 1] [2018-12-03 18:47:04,247 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:47:04,247 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:47:04,248 INFO L82 PathProgramCache]: Analyzing trace with hash -656721304, now seen corresponding path program 11 times [2018-12-03 18:47:04,248 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:47:04,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:04,248 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:47:04,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:04,249 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:47:04,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:04,696 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:04,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:04,697 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:47:04,697 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:47:04,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:47:04,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:04,698 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:47:04,715 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:47:04,715 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:47:04,744 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-03 18:47:04,744 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:47:04,746 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:47:04,808 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:04,809 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:47:06,076 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:06,096 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:47:06,096 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-12-03 18:47:06,096 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:47:06,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-03 18:47:06,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-03 18:47:06,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=1329, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 18:47:06,098 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 25 states. [2018-12-03 18:47:07,028 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2018-12-03 18:47:07,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:47:07,192 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2018-12-03 18:47:07,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 18:47:07,193 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 24 [2018-12-03 18:47:07,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:47:07,194 INFO L225 Difference]: With dead ends: 29 [2018-12-03 18:47:07,194 INFO L226 Difference]: Without dead ends: 27 [2018-12-03 18:47:07,195 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1665, Invalid=2757, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 18:47:07,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-03 18:47:07,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-03 18:47:07,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 18:47:07,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-12-03 18:47:07,200 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-12-03 18:47:07,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:47:07,201 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-12-03 18:47:07,201 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-03 18:47:07,201 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-12-03 18:47:07,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 18:47:07,202 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:47:07,202 INFO L402 BasicCegarLoop]: trace histogram [23, 1, 1, 1] [2018-12-03 18:47:07,202 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:47:07,202 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:47:07,203 INFO L82 PathProgramCache]: Analyzing trace with hash 250956168, now seen corresponding path program 12 times [2018-12-03 18:47:07,203 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:47:07,203 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:07,203 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:47:07,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:07,204 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:47:07,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:07,573 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:07,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:07,574 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:47:07,574 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:47:07,574 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:47:07,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:07,575 INFO 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 18:47:07,583 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:47:07,583 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:47:07,631 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:47:07,631 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:47:07,644 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:47:07,860 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:07,860 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:47:09,276 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:09,296 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:47:09,296 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2018-12-03 18:47:09,296 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:47:09,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 18:47:09,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 18:47:09,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=884, Invalid=1666, Unknown=0, NotChecked=0, Total=2550 [2018-12-03 18:47:09,297 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 27 states. [2018-12-03 18:47:10,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:47:10,853 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-12-03 18:47:10,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 18:47:10,856 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 26 [2018-12-03 18:47:10,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:47:10,856 INFO L225 Difference]: With dead ends: 31 [2018-12-03 18:47:10,857 INFO L226 Difference]: Without dead ends: 29 [2018-12-03 18:47:10,858 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2010, Invalid=3392, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 18:47:10,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-12-03 18:47:10,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-12-03 18:47:10,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-12-03 18:47:10,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-12-03 18:47:10,868 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-12-03 18:47:10,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:47:10,868 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-12-03 18:47:10,868 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 18:47:10,868 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-12-03 18:47:10,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-12-03 18:47:10,869 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:47:10,869 INFO L402 BasicCegarLoop]: trace histogram [25, 1, 1, 1] [2018-12-03 18:47:10,869 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:47:10,869 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:47:10,869 INFO L82 PathProgramCache]: Analyzing trace with hash 650645672, now seen corresponding path program 13 times [2018-12-03 18:47:10,869 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:47:10,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:10,871 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:47:10,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:10,871 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:47:10,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:11,381 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:11,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:11,381 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:47:11,382 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:47:11,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:47:11,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:11,382 INFO 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 18:47:11,392 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:47:11,392 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:47:11,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:11,432 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:47:11,525 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:11,526 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:47:12,716 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:12,735 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:47:12,735 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 54 [2018-12-03 18:47:12,735 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:47:12,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 18:47:12,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 18:47:12,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1935, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 18:47:12,737 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 29 states. [2018-12-03 18:47:13,063 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 11 [2018-12-03 18:47:14,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:47:14,386 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2018-12-03 18:47:14,386 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 18:47:14,387 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 28 [2018-12-03 18:47:14,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:47:14,388 INFO L225 Difference]: With dead ends: 33 [2018-12-03 18:47:14,388 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 18:47:14,390 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2359, Invalid=3961, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 18:47:14,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 18:47:14,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-12-03 18:47:14,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 18:47:14,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-12-03 18:47:14,394 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-12-03 18:47:14,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:47:14,394 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-12-03 18:47:14,394 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 18:47:14,394 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-12-03 18:47:14,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 18:47:14,395 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:47:14,395 INFO L402 BasicCegarLoop]: trace histogram [27, 1, 1, 1] [2018-12-03 18:47:14,396 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:47:14,396 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:47:14,396 INFO L82 PathProgramCache]: Analyzing trace with hash -1794797624, now seen corresponding path program 14 times [2018-12-03 18:47:14,396 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:47:14,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:14,397 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:47:14,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:14,397 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:47:14,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:14,927 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:14,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:14,928 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:47:14,928 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:47:14,928 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:47:14,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:14,928 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:47:14,937 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:47:14,937 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:47:14,957 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-03 18:47:14,957 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:47:14,959 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:47:15,702 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:15,702 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:47:17,262 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:17,280 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:47:17,281 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-12-03 18:47:17,281 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:47:17,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-12-03 18:47:17,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-12-03 18:47:17,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1194, Invalid=2112, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 18:47:17,282 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 31 states. [2018-12-03 18:47:19,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:47:19,073 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2018-12-03 18:47:19,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 18:47:19,073 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 30 [2018-12-03 18:47:19,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:47:19,074 INFO L225 Difference]: With dead ends: 35 [2018-12-03 18:47:19,074 INFO L226 Difference]: Without dead ends: 33 [2018-12-03 18:47:19,079 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=2706, Invalid=4434, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 18:47:19,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-03 18:47:19,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-12-03 18:47:19,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-03 18:47:19,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-12-03 18:47:19,084 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-12-03 18:47:19,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:47:19,084 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-12-03 18:47:19,084 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-12-03 18:47:19,084 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-12-03 18:47:19,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 18:47:19,085 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:47:19,085 INFO L402 BasicCegarLoop]: trace histogram [29, 1, 1, 1] [2018-12-03 18:47:19,085 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:47:19,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:47:19,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1776273128, now seen corresponding path program 15 times [2018-12-03 18:47:19,086 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:47:19,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:19,087 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:47:19,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:19,087 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:47:19,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:19,631 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:19,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:19,632 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:47:19,632 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:47:19,632 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:47:19,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:19,632 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 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 18:47:19,643 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:47:19,644 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:47:19,681 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:47:19,681 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:47:19,699 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:47:19,753 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:19,753 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:47:21,194 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:21,213 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:47:21,213 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 62 [2018-12-03 18:47:21,213 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:47:21,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-12-03 18:47:21,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-12-03 18:47:21,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1373, Invalid=2533, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 18:47:21,215 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 33 states. [2018-12-03 18:47:23,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:47:23,073 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-12-03 18:47:23,074 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 18:47:23,074 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 32 [2018-12-03 18:47:23,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:47:23,075 INFO L225 Difference]: With dead ends: 37 [2018-12-03 18:47:23,075 INFO L226 Difference]: Without dead ends: 35 [2018-12-03 18:47:23,079 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3141, Invalid=5231, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 18:47:23,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-12-03 18:47:23,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-12-03 18:47:23,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-12-03 18:47:23,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-12-03 18:47:23,084 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-12-03 18:47:23,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:47:23,084 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-12-03 18:47:23,084 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-12-03 18:47:23,084 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-12-03 18:47:23,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-12-03 18:47:23,085 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:47:23,085 INFO L402 BasicCegarLoop]: trace histogram [31, 1, 1, 1] [2018-12-03 18:47:23,086 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:47:23,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:47:23,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1896396296, now seen corresponding path program 16 times [2018-12-03 18:47:23,086 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:47:23,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:23,087 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:47:23,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:23,087 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:47:23,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:23,966 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:23,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:23,966 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:47:23,967 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:47:23,967 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:47:23,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:23,967 INFO 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 18:47:23,977 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:47:23,977 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:47:24,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:24,041 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:47:24,133 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:24,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:47:25,845 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:25,864 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:47:25,864 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 66 [2018-12-03 18:47:25,864 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:47:25,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 18:47:25,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 18:47:25,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1560, Invalid=2862, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 18:47:25,865 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 35 states. [2018-12-03 18:47:27,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:47:27,954 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-12-03 18:47:27,955 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 18:47:27,955 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 34 [2018-12-03 18:47:27,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:47:27,956 INFO L225 Difference]: With dead ends: 39 [2018-12-03 18:47:27,956 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 18:47:27,957 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=3574, Invalid=5932, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 18:47:27,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 18:47:27,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-12-03 18:47:27,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 18:47:27,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-12-03 18:47:27,962 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-12-03 18:47:27,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:47:27,963 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-12-03 18:47:27,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 18:47:27,963 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-12-03 18:47:27,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-12-03 18:47:27,963 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:47:27,963 INFO L402 BasicCegarLoop]: trace histogram [33, 1, 1, 1] [2018-12-03 18:47:27,963 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:47:27,964 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:47:27,964 INFO L82 PathProgramCache]: Analyzing trace with hash 1370643752, now seen corresponding path program 17 times [2018-12-03 18:47:27,964 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:47:27,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:27,964 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:47:27,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:27,965 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:47:28,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:28,664 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:28,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:28,664 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:47:28,664 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:47:28,665 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:47:28,665 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:28,665 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 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 18:47:28,678 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:47:28,678 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:47:28,747 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-03 18:47:28,747 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:47:28,750 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:47:28,938 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:28,939 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:47:30,606 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:30,624 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:47:30,624 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-12-03 18:47:30,625 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:47:30,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-12-03 18:47:30,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-12-03 18:47:30,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1755, Invalid=3075, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 18:47:30,626 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 37 states. [2018-12-03 18:47:33,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:47:33,012 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2018-12-03 18:47:33,013 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 18:47:33,013 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 36 [2018-12-03 18:47:33,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:47:33,013 INFO L225 Difference]: With dead ends: 41 [2018-12-03 18:47:33,013 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 18:47:33,015 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3999, Invalid=6507, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 18:47:33,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 18:47:33,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-12-03 18:47:33,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 18:47:33,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-12-03 18:47:33,020 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-12-03 18:47:33,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:47:33,020 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-12-03 18:47:33,021 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-12-03 18:47:33,021 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-12-03 18:47:33,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 18:47:33,021 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:47:33,021 INFO L402 BasicCegarLoop]: trace histogram [35, 1, 1, 1] [2018-12-03 18:47:33,022 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:47:33,022 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:47:33,022 INFO L82 PathProgramCache]: Analyzing trace with hash -1366377400, now seen corresponding path program 18 times [2018-12-03 18:47:33,022 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:47:33,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:33,023 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:47:33,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:33,023 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:47:33,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:33,781 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:33,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:33,781 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:47:33,781 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:47:33,781 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:47:33,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:33,782 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 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 18:47:33,790 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:47:33,790 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:47:33,848 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:47:33,848 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:47:33,877 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:47:34,020 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:34,021 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:47:35,889 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:35,910 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:47:35,911 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 74 [2018-12-03 18:47:35,911 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:47:35,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-12-03 18:47:35,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-12-03 18:47:35,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1970, Invalid=3580, Unknown=0, NotChecked=0, Total=5550 [2018-12-03 18:47:35,912 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 39 states. [2018-12-03 18:47:38,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:47:38,651 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-12-03 18:47:38,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 18:47:38,652 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 38 [2018-12-03 18:47:38,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:47:38,652 INFO L225 Difference]: With dead ends: 43 [2018-12-03 18:47:38,653 INFO L226 Difference]: Without dead ends: 41 [2018-12-03 18:47:38,655 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 702 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=4524, Invalid=7466, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 18:47:38,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-12-03 18:47:38,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-12-03 18:47:38,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-12-03 18:47:38,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-12-03 18:47:38,661 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-12-03 18:47:38,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:47:38,661 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-12-03 18:47:38,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-12-03 18:47:38,662 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-12-03 18:47:38,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-12-03 18:47:38,662 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:47:38,662 INFO L402 BasicCegarLoop]: trace histogram [37, 1, 1, 1] [2018-12-03 18:47:38,663 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:47:38,663 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:47:38,663 INFO L82 PathProgramCache]: Analyzing trace with hash 1171247976, now seen corresponding path program 19 times [2018-12-03 18:47:38,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:47:38,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:38,664 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:47:38,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:38,664 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:47:38,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:40,119 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:40,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:40,119 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:47:40,119 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:47:40,119 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:47:40,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:40,119 INFO 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 18:47:40,130 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:47:40,130 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:47:40,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:40,221 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:47:40,290 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:40,290 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:47:42,338 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:42,356 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:47:42,357 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 78 [2018-12-03 18:47:42,357 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:47:42,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 18:47:42,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 18:47:42,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2193, Invalid=3969, Unknown=0, NotChecked=0, Total=6162 [2018-12-03 18:47:42,358 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 41 states. [2018-12-03 18:47:45,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:47:45,429 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2018-12-03 18:47:45,430 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 18:47:45,430 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 40 [2018-12-03 18:47:45,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:47:45,431 INFO L225 Difference]: With dead ends: 45 [2018-12-03 18:47:45,431 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 18:47:45,431 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 779 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=5041, Invalid=8299, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 18:47:45,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 18:47:45,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-12-03 18:47:45,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-12-03 18:47:45,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-12-03 18:47:45,437 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2018-12-03 18:47:45,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:47:45,437 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-12-03 18:47:45,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 18:47:45,438 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-12-03 18:47:45,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 18:47:45,438 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:47:45,438 INFO L402 BasicCegarLoop]: trace histogram [39, 1, 1, 1] [2018-12-03 18:47:45,439 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:47:45,439 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:47:45,439 INFO L82 PathProgramCache]: Analyzing trace with hash 287810184, now seen corresponding path program 20 times [2018-12-03 18:47:45,439 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:47:45,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:45,440 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:47:45,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:45,440 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:47:45,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:46,495 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:46,495 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:46,496 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:47:46,496 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:47:46,496 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:47:46,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:46,496 INFO 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 18:47:46,504 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:47:46,505 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:47:46,532 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-12-03 18:47:46,532 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:47:46,535 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:47:46,595 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:46,595 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:47:48,875 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:48,893 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:47:48,893 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-12-03 18:47:48,893 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:47:48,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-12-03 18:47:48,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-12-03 18:47:48,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2424, Invalid=4218, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 18:47:48,895 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 43 states. [2018-12-03 18:47:52,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:47:52,376 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2018-12-03 18:47:52,377 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 18:47:52,377 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 42 [2018-12-03 18:47:52,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:47:52,377 INFO L225 Difference]: With dead ends: 47 [2018-12-03 18:47:52,378 INFO L226 Difference]: Without dead ends: 45 [2018-12-03 18:47:52,378 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=5544, Invalid=8976, Unknown=0, NotChecked=0, Total=14520 [2018-12-03 18:47:52,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-12-03 18:47:52,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-12-03 18:47:52,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 18:47:52,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-12-03 18:47:52,384 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2018-12-03 18:47:52,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:47:52,384 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-12-03 18:47:52,384 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-12-03 18:47:52,385 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-12-03 18:47:52,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 18:47:52,385 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:47:52,385 INFO L402 BasicCegarLoop]: trace histogram [41, 1, 1, 1] [2018-12-03 18:47:52,386 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:47:52,386 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:47:52,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1707616680, now seen corresponding path program 21 times [2018-12-03 18:47:52,386 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:47:52,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:52,387 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:47:52,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:47:52,387 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:47:52,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:47:53,437 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:53,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:53,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:47:53,438 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:47:53,438 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:47:53,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:47:53,438 INFO 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 18:47:53,447 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:47:53,447 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:47:53,526 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:47:53,526 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:47:53,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:47:53,664 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:53,665 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:47:56,553 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:47:56,574 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:47:56,575 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 86 [2018-12-03 18:47:56,575 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:47:56,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 18:47:56,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 18:47:56,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2675, Invalid=4807, Unknown=0, NotChecked=0, Total=7482 [2018-12-03 18:47:56,576 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 45 states. [2018-12-03 18:48:00,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:48:00,497 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-12-03 18:48:00,498 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 18:48:00,498 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 44 [2018-12-03 18:48:00,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:48:00,499 INFO L225 Difference]: With dead ends: 49 [2018-12-03 18:48:00,499 INFO L226 Difference]: Without dead ends: 47 [2018-12-03 18:48:00,502 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 945 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=6159, Invalid=10097, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 18:48:00,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-12-03 18:48:00,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-12-03 18:48:00,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-12-03 18:48:00,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-12-03 18:48:00,507 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2018-12-03 18:48:00,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:48:00,507 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-12-03 18:48:00,507 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 18:48:00,507 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-12-03 18:48:00,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-12-03 18:48:00,508 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:48:00,508 INFO L402 BasicCegarLoop]: trace histogram [43, 1, 1, 1] [2018-12-03 18:48:00,508 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:48:00,509 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:48:00,509 INFO L82 PathProgramCache]: Analyzing trace with hash 342059208, now seen corresponding path program 22 times [2018-12-03 18:48:00,509 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:48:00,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:48:00,510 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:48:00,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:48:00,510 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:48:00,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:48:01,581 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:01,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:48:01,582 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:48:01,582 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:48:01,582 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:48:01,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:48:01,582 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:48:01,592 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:48:01,593 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:48:01,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:48:01,725 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:48:01,817 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:01,817 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:48:04,899 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:04,919 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:48:04,919 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 90 [2018-12-03 18:48:04,919 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:48:04,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 18:48:04,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 18:48:04,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2934, Invalid=5256, Unknown=0, NotChecked=0, Total=8190 [2018-12-03 18:48:04,921 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 47 states. [2018-12-03 18:48:09,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:48:09,009 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2018-12-03 18:48:09,010 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 18:48:09,010 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 46 [2018-12-03 18:48:09,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:48:09,011 INFO L225 Difference]: With dead ends: 51 [2018-12-03 18:48:09,011 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 18:48:09,013 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1034 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=6760, Invalid=11062, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 18:48:09,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 18:48:09,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-12-03 18:48:09,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 18:48:09,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-12-03 18:48:09,018 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2018-12-03 18:48:09,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:48:09,019 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-12-03 18:48:09,019 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 18:48:09,019 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-12-03 18:48:09,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 18:48:09,019 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:48:09,019 INFO L402 BasicCegarLoop]: trace histogram [45, 1, 1, 1] [2018-12-03 18:48:09,020 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:48:09,020 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:48:09,020 INFO L82 PathProgramCache]: Analyzing trace with hash -1993646104, now seen corresponding path program 23 times [2018-12-03 18:48:09,020 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:48:09,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:48:09,021 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:48:09,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:48:09,021 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:48:09,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:48:10,763 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:10,764 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:48:10,764 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:48:10,764 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:48:10,764 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:48:10,764 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:48:10,764 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:48:10,785 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:48:10,785 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:48:10,866 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 18:48:10,867 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:48:10,869 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:48:11,116 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:11,116 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:48:13,983 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:14,004 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:48:14,004 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-12-03 18:48:14,004 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:48:14,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-12-03 18:48:14,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-12-03 18:48:14,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3201, Invalid=5541, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 18:48:14,005 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 49 states. [2018-12-03 18:48:14,803 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 11 [2018-12-03 18:48:18,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:48:18,636 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2018-12-03 18:48:18,637 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-12-03 18:48:18,637 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 48 [2018-12-03 18:48:18,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:48:18,638 INFO L225 Difference]: With dead ends: 53 [2018-12-03 18:48:18,638 INFO L226 Difference]: Without dead ends: 51 [2018-12-03 18:48:18,639 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1081 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=7341, Invalid=11841, Unknown=0, NotChecked=0, Total=19182 [2018-12-03 18:48:18,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-12-03 18:48:18,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-12-03 18:48:18,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 18:48:18,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-12-03 18:48:18,644 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2018-12-03 18:48:18,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:48:18,644 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-12-03 18:48:18,645 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-12-03 18:48:18,645 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-12-03 18:48:18,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 18:48:18,645 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:48:18,645 INFO L402 BasicCegarLoop]: trace histogram [47, 1, 1, 1] [2018-12-03 18:48:18,646 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:48:18,646 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:48:18,646 INFO L82 PathProgramCache]: Analyzing trace with hash -338555128, now seen corresponding path program 24 times [2018-12-03 18:48:18,646 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:48:18,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:48:18,647 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:48:18,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:48:18,647 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:48:18,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:48:20,148 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:20,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:48:20,148 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:48:20,149 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:48:20,149 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:48:20,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:48:20,149 INFO 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 18:48:20,157 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:48:20,157 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:48:20,271 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:48:20,271 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:48:20,331 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:48:20,409 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:20,409 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:48:23,691 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:23,711 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:48:23,711 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 98 [2018-12-03 18:48:23,711 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:48:23,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-12-03 18:48:23,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-12-03 18:48:23,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3488, Invalid=6214, Unknown=0, NotChecked=0, Total=9702 [2018-12-03 18:48:23,713 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 51 states. [2018-12-03 18:48:24,067 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 18:48:25,078 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 11 [2018-12-03 18:48:28,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:48:28,840 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-12-03 18:48:28,840 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 18:48:28,841 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 50 [2018-12-03 18:48:28,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:48:28,841 INFO L225 Difference]: With dead ends: 55 [2018-12-03 18:48:28,841 INFO L226 Difference]: Without dead ends: 53 [2018-12-03 18:48:28,843 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1224 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=8046, Invalid=13124, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 18:48:28,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-12-03 18:48:28,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-12-03 18:48:28,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-12-03 18:48:28,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-12-03 18:48:28,846 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2018-12-03 18:48:28,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:48:28,847 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-12-03 18:48:28,847 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-12-03 18:48:28,847 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-12-03 18:48:28,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-12-03 18:48:28,847 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:48:28,847 INFO L402 BasicCegarLoop]: trace histogram [49, 1, 1, 1] [2018-12-03 18:48:28,848 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:48:28,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:48:28,848 INFO L82 PathProgramCache]: Analyzing trace with hash 1065973288, now seen corresponding path program 25 times [2018-12-03 18:48:28,848 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:48:28,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:48:28,849 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:48:28,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:48:28,849 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:48:28,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:48:30,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:30,597 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:48:30,598 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:48:30,598 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:48:30,598 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:48:30,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:48:30,598 INFO 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 18:48:30,608 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:48:30,608 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:48:30,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:48:30,815 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:48:30,892 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:30,892 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:48:34,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:34,449 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:48:34,449 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 102 [2018-12-03 18:48:34,449 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:48:34,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 18:48:34,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 18:48:34,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3783, Invalid=6723, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 18:48:34,451 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 53 states. [2018-12-03 18:48:34,581 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 8 [2018-12-03 18:48:34,705 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 9 [2018-12-03 18:48:34,827 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:48:34,951 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:48:35,345 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 18:48:35,491 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-12-03 18:48:40,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:48:40,097 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2018-12-03 18:48:40,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 18:48:40,098 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 52 [2018-12-03 18:48:40,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:48:40,099 INFO L225 Difference]: With dead ends: 57 [2018-12-03 18:48:40,099 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 18:48:40,100 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1325 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=8731, Invalid=14221, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 18:48:40,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 18:48:40,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-12-03 18:48:40,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-03 18:48:40,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-12-03 18:48:40,104 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2018-12-03 18:48:40,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:48:40,105 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-12-03 18:48:40,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 18:48:40,105 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-12-03 18:48:40,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 18:48:40,106 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:48:40,106 INFO L402 BasicCegarLoop]: trace histogram [51, 1, 1, 1] [2018-12-03 18:48:40,106 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:48:40,106 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:48:40,106 INFO L82 PathProgramCache]: Analyzing trace with hash -2096917176, now seen corresponding path program 26 times [2018-12-03 18:48:40,106 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:48:40,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:48:40,107 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:48:40,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:48:40,107 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:48:40,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:48:41,812 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:41,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:48:41,812 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:48:41,813 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:48:41,813 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:48:41,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:48:41,813 INFO 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 18:48:41,821 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:48:41,822 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:48:41,859 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-12-03 18:48:41,859 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:48:41,862 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:48:41,934 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:41,935 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:48:45,673 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:45,692 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:48:45,692 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-12-03 18:48:45,693 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:48:45,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 18:48:45,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 18:48:45,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4086, Invalid=7044, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 18:48:45,695 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 55 states. [2018-12-03 18:48:45,878 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 8 [2018-12-03 18:48:46,012 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 9 [2018-12-03 18:48:46,154 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:48:46,280 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:48:46,416 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:48:46,547 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:48:46,688 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 18:48:51,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:48:51,949 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2018-12-03 18:48:51,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 18:48:51,950 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 54 [2018-12-03 18:48:51,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:48:51,950 INFO L225 Difference]: With dead ends: 59 [2018-12-03 18:48:51,950 INFO L226 Difference]: Without dead ends: 57 [2018-12-03 18:48:51,952 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1378 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=9390, Invalid=15102, Unknown=0, NotChecked=0, Total=24492 [2018-12-03 18:48:51,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-12-03 18:48:51,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-12-03 18:48:51,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-03 18:48:51,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-12-03 18:48:51,955 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2018-12-03 18:48:51,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:48:51,955 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-12-03 18:48:51,955 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 18:48:51,956 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-12-03 18:48:51,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-12-03 18:48:51,956 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:48:51,956 INFO L402 BasicCegarLoop]: trace histogram [53, 1, 1, 1] [2018-12-03 18:48:51,957 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:48:51,957 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:48:51,957 INFO L82 PathProgramCache]: Analyzing trace with hash -797807512, now seen corresponding path program 27 times [2018-12-03 18:48:51,957 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:48:51,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:48:51,957 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:48:51,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:48:51,958 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:48:52,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:48:53,512 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:53,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:48:53,513 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:48:53,513 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:48:53,513 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:48:53,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:48:53,513 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:48:53,522 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:48:53,523 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:48:53,672 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:48:53,672 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:48:53,754 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:48:53,882 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:53,882 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:48:58,266 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:48:58,285 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:48:58,286 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 110 [2018-12-03 18:48:58,286 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:48:58,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-12-03 18:48:58,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-12-03 18:48:58,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4409, Invalid=7801, Unknown=0, NotChecked=0, Total=12210 [2018-12-03 18:48:58,287 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 57 states. [2018-12-03 18:48:58,425 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-12-03 18:48:58,559 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-12-03 18:48:58,700 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:48:58,837 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:48:58,983 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:48:59,117 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:48:59,256 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:49:04,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:49:04,963 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-12-03 18:49:04,964 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 18:49:04,964 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 56 [2018-12-03 18:49:04,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:49:04,965 INFO L225 Difference]: With dead ends: 61 [2018-12-03 18:49:04,965 INFO L226 Difference]: Without dead ends: 59 [2018-12-03 18:49:04,966 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1539 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=10185, Invalid=16547, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 18:49:04,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-12-03 18:49:04,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-12-03 18:49:04,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-12-03 18:49:04,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-12-03 18:49:04,971 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2018-12-03 18:49:04,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:49:04,971 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-12-03 18:49:04,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-12-03 18:49:04,971 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-12-03 18:49:04,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-12-03 18:49:04,972 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:49:04,972 INFO L402 BasicCegarLoop]: trace histogram [55, 1, 1, 1] [2018-12-03 18:49:04,972 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:49:04,973 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:49:04,973 INFO L82 PathProgramCache]: Analyzing trace with hash 2106063752, now seen corresponding path program 28 times [2018-12-03 18:49:04,973 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:49:04,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:49:04,974 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:49:04,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:49:04,974 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:49:05,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:49:06,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:49:06,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:49:06,921 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:49:06,921 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:49:06,921 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:49:06,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:49:06,922 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:49:06,932 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:49:06,933 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:49:07,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:49:07,176 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:49:07,297 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:49:07,297 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:49:11,948 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:49:11,967 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:49:11,967 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 114 [2018-12-03 18:49:11,967 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:49:11,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 18:49:11,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 18:49:11,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4740, Invalid=8370, Unknown=0, NotChecked=0, Total=13110 [2018-12-03 18:49:11,969 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 59 states. [2018-12-03 18:49:12,117 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-12-03 18:49:12,258 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 9 [2018-12-03 18:49:12,423 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:49:12,580 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:49:12,728 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:49:12,871 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:49:13,016 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:49:13,163 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:49:13,316 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:49:13,467 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:49:19,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:49:19,388 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-12-03 18:49:19,389 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 18:49:19,389 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 58 [2018-12-03 18:49:19,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:49:19,390 INFO L225 Difference]: With dead ends: 63 [2018-12-03 18:49:19,390 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 18:49:19,391 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1652 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=10954, Invalid=17776, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 18:49:19,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 18:49:19,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-12-03 18:49:19,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-12-03 18:49:19,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-12-03 18:49:19,396 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2018-12-03 18:49:19,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:49:19,396 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-12-03 18:49:19,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 18:49:19,396 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-12-03 18:49:19,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-12-03 18:49:19,397 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:49:19,397 INFO L402 BasicCegarLoop]: trace histogram [57, 1, 1, 1] [2018-12-03 18:49:19,397 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:49:19,397 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:49:19,398 INFO L82 PathProgramCache]: Analyzing trace with hash 997606056, now seen corresponding path program 29 times [2018-12-03 18:49:19,398 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:49:19,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:49:19,399 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:49:19,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:49:19,399 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:49:19,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:49:21,198 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:49:21,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:49:21,199 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:49:21,199 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:49:21,199 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:49:21,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:49:21,199 INFO 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 18:49:21,208 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:49:21,208 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:49:21,250 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-03 18:49:21,250 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:49:21,254 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:49:21,389 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:49:21,390 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:49:26,035 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:49:26,056 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:49:26,056 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 117 [2018-12-03 18:49:26,056 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:49:26,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-12-03 18:49:26,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-12-03 18:49:26,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5079, Invalid=8727, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 18:49:26,058 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 61 states. [2018-12-03 18:49:26,213 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 8 [2018-12-03 18:49:26,360 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 9 [2018-12-03 18:49:26,539 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:49:26,703 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:49:26,866 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:49:27,020 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:49:27,174 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:49:27,322 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:49:27,477 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:49:27,635 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:49:27,796 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:49:34,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:49:34,280 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2018-12-03 18:49:34,280 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-12-03 18:49:34,280 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 60 [2018-12-03 18:49:34,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:49:34,281 INFO L225 Difference]: With dead ends: 65 [2018-12-03 18:49:34,281 INFO L226 Difference]: Without dead ends: 63 [2018-12-03 18:49:34,285 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1711 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=11691, Invalid=18759, Unknown=0, NotChecked=0, Total=30450 [2018-12-03 18:49:34,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-12-03 18:49:34,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-12-03 18:49:34,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 18:49:34,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-12-03 18:49:34,290 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2018-12-03 18:49:34,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:49:34,290 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-12-03 18:49:34,290 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-12-03 18:49:34,290 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-12-03 18:49:34,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 18:49:34,291 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:49:34,291 INFO L402 BasicCegarLoop]: trace histogram [59, 1, 1, 1] [2018-12-03 18:49:34,291 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:49:34,291 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:49:34,292 INFO L82 PathProgramCache]: Analyzing trace with hash 921649608, now seen corresponding path program 30 times [2018-12-03 18:49:34,292 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:49:34,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:49:34,292 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:49:34,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:49:34,293 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:49:34,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:49:36,242 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:49:36,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:49:36,242 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:49:36,242 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:49:36,242 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:49:36,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:49:36,243 INFO 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 18:49:36,252 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:49:36,253 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:49:36,441 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:49:36,442 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:49:36,550 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:49:36,752 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:49:36,752 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:49:42,284 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:49:42,303 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:49:42,303 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 122 [2018-12-03 18:49:42,303 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:49:42,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 18:49:42,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 18:49:42,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5438, Invalid=9568, Unknown=0, NotChecked=0, Total=15006 [2018-12-03 18:49:42,304 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 63 states. [2018-12-03 18:49:42,478 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-12-03 18:49:42,630 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-12-03 18:49:42,793 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:49:42,952 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:49:43,116 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:49:43,274 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:49:43,434 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:49:43,598 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:49:43,768 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:49:43,930 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:49:44,094 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:49:44,259 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:49:44,421 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:49:44,759 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 18:49:50,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:49:50,903 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-12-03 18:49:50,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 18:49:50,903 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 62 [2018-12-03 18:49:50,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:49:50,904 INFO L225 Difference]: With dead ends: 67 [2018-12-03 18:49:50,904 INFO L226 Difference]: Without dead ends: 65 [2018-12-03 18:49:50,906 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1890 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=12576, Invalid=20366, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 18:49:50,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-12-03 18:49:50,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2018-12-03 18:49:50,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-12-03 18:49:50,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-12-03 18:49:50,910 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2018-12-03 18:49:50,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:49:50,910 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-12-03 18:49:50,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 18:49:50,911 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-12-03 18:49:50,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-12-03 18:49:50,911 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:49:50,911 INFO L402 BasicCegarLoop]: trace histogram [61, 1, 1, 1] [2018-12-03 18:49:50,911 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:49:50,911 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:49:50,912 INFO L82 PathProgramCache]: Analyzing trace with hash 941947112, now seen corresponding path program 31 times [2018-12-03 18:49:50,912 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:49:50,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:49:50,912 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:49:50,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:49:50,913 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:49:51,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:49:53,236 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:49:53,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:49:53,237 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:49:53,237 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:49:53,237 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:49:53,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:49:53,237 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:49:53,246 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:49:53,246 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:49:53,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:49:53,571 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:49:53,670 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:49:53,671 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:49:59,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:49:59,254 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:49:59,254 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 126 [2018-12-03 18:49:59,254 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:49:59,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 18:49:59,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 18:49:59,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5805, Invalid=10197, Unknown=0, NotChecked=0, Total=16002 [2018-12-03 18:49:59,256 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 65 states. [2018-12-03 18:49:59,431 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-12-03 18:49:59,592 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 9 [2018-12-03 18:49:59,763 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:49:59,929 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:50:00,102 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:50:00,268 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:50:00,440 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:50:00,611 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:50:00,781 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:50:00,954 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:50:01,126 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:50:01,302 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:50:01,475 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:50:01,647 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:50:01,839 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:50:02,393 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 18:50:02,778 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-12-03 18:50:08,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:50:08,789 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-12-03 18:50:08,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 18:50:08,789 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 64 [2018-12-03 18:50:08,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:50:08,791 INFO L225 Difference]: With dead ends: 69 [2018-12-03 18:50:08,791 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 18:50:08,793 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2015 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=13429, Invalid=21727, Unknown=0, NotChecked=0, Total=35156 [2018-12-03 18:50:08,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 18:50:08,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-12-03 18:50:08,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-12-03 18:50:08,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2018-12-03 18:50:08,798 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2018-12-03 18:50:08,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:50:08,798 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2018-12-03 18:50:08,798 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 18:50:08,799 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2018-12-03 18:50:08,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-12-03 18:50:08,799 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:50:08,799 INFO L402 BasicCegarLoop]: trace histogram [63, 1, 1, 1] [2018-12-03 18:50:08,799 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:50:08,800 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:50:08,800 INFO L82 PathProgramCache]: Analyzing trace with hash -1026988024, now seen corresponding path program 32 times [2018-12-03 18:50:08,800 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:50:08,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:50:08,801 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:50:08,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:50:08,801 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:50:09,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:50:11,201 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:50:11,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:50:11,202 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:50:11,202 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:50:11,202 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:50:11,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:50:11,202 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:50:11,211 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:50:11,211 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:50:11,268 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-12-03 18:50:11,269 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:50:11,272 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:50:11,399 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:50:11,399 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:50:17,117 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:50:17,136 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:50:17,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 129 [2018-12-03 18:50:17,137 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:50:17,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-12-03 18:50:17,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-12-03 18:50:17,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6180, Invalid=10590, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 18:50:17,139 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 67 states. [2018-12-03 18:50:17,309 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 8 [2018-12-03 18:50:17,484 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 9 [2018-12-03 18:50:17,702 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:50:17,875 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:50:18,063 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:50:18,245 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:50:18,428 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:50:18,608 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:50:18,795 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:50:18,987 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:50:19,174 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:50:19,362 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:50:19,550 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:50:19,730 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:50:19,922 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:50:20,136 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:50:20,521 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:50:27,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:50:27,452 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2018-12-03 18:50:27,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 18:50:27,452 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 66 [2018-12-03 18:50:27,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:50:27,453 INFO L225 Difference]: With dead ends: 71 [2018-12-03 18:50:27,453 INFO L226 Difference]: Without dead ends: 69 [2018-12-03 18:50:27,456 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2080 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=14244, Invalid=22812, Unknown=0, NotChecked=0, Total=37056 [2018-12-03 18:50:27,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-12-03 18:50:27,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-12-03 18:50:27,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-03 18:50:27,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-12-03 18:50:27,461 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2018-12-03 18:50:27,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:50:27,462 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-12-03 18:50:27,462 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-12-03 18:50:27,462 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-12-03 18:50:27,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-12-03 18:50:27,463 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:50:27,463 INFO L402 BasicCegarLoop]: trace histogram [65, 1, 1, 1] [2018-12-03 18:50:27,463 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:50:27,463 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:50:27,463 INFO L82 PathProgramCache]: Analyzing trace with hash 906923816, now seen corresponding path program 33 times [2018-12-03 18:50:27,463 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:50:27,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:50:27,464 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:50:27,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:50:27,464 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:50:27,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:50:29,981 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:50:29,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:50:29,981 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:50:29,981 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:50:29,981 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:50:29,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:50:29,982 INFO 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 18:50:29,991 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:50:29,991 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:50:30,240 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:50:30,240 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:50:30,382 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:50:30,483 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:50:30,483 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:50:37,184 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:50:37,203 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:50:37,203 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 134 [2018-12-03 18:50:37,204 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:50:37,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-12-03 18:50:37,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-12-03 18:50:37,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6575, Invalid=11515, Unknown=0, NotChecked=0, Total=18090 [2018-12-03 18:50:37,205 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 69 states. [2018-12-03 18:50:37,391 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-12-03 18:50:37,567 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-12-03 18:50:37,754 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:50:37,943 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:50:38,145 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:50:38,352 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:50:38,552 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:50:38,740 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:50:38,933 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:50:39,124 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:50:39,317 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:50:39,513 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:50:39,701 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:50:39,887 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:50:40,091 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:50:40,281 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:50:40,481 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:50:40,684 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:50:40,885 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:50:41,086 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:50:48,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:50:48,182 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-12-03 18:50:48,182 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 18:50:48,182 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 68 [2018-12-03 18:50:48,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:50:48,183 INFO L225 Difference]: With dead ends: 73 [2018-12-03 18:50:48,183 INFO L226 Difference]: Without dead ends: 71 [2018-12-03 18:50:48,185 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2277 ImplicationChecksByTransitivity, 19.7s TimeCoverageRelationStatistics Valid=15219, Invalid=24581, Unknown=0, NotChecked=0, Total=39800 [2018-12-03 18:50:48,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-12-03 18:50:48,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2018-12-03 18:50:48,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-12-03 18:50:48,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-12-03 18:50:48,191 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2018-12-03 18:50:48,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:50:48,191 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-12-03 18:50:48,191 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-12-03 18:50:48,191 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-12-03 18:50:48,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-12-03 18:50:48,191 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:50:48,191 INFO L402 BasicCegarLoop]: trace histogram [67, 1, 1, 1] [2018-12-03 18:50:48,192 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:50:48,192 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:50:48,192 INFO L82 PathProgramCache]: Analyzing trace with hash -324637112, now seen corresponding path program 34 times [2018-12-03 18:50:48,192 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:50:48,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:50:48,193 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:50:48,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:50:48,193 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:50:48,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:50:51,626 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:50:51,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:50:51,626 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:50:51,626 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:50:51,626 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:50:51,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:50:51,626 INFO 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 18:50:51,637 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:50:51,637 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:50:51,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:50:52,064 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:50:52,168 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:50:52,169 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:50:58,840 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:50:58,861 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:50:58,861 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 138 [2018-12-03 18:50:58,861 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:50:58,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 18:50:58,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 18:50:58,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6978, Invalid=12204, Unknown=0, NotChecked=0, Total=19182 [2018-12-03 18:50:58,863 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 71 states. [2018-12-03 18:50:59,108 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-12-03 18:50:59,293 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 9 [2018-12-03 18:50:59,490 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:50:59,692 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:50:59,896 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:51:00,085 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:51:00,281 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:51:00,478 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:51:00,676 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:51:00,883 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:51:01,089 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:51:01,312 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:51:01,545 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:51:01,780 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:51:02,013 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:51:02,247 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:51:02,477 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:51:02,720 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:51:02,941 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:51:03,147 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:51:03,355 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:51:03,564 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:51:03,789 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 18:51:04,007 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 18:51:11,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:51:11,001 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2018-12-03 18:51:11,002 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 18:51:11,002 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 70 [2018-12-03 18:51:11,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:51:11,003 INFO L225 Difference]: With dead ends: 75 [2018-12-03 18:51:11,003 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 18:51:11,004 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2414 ImplicationChecksByTransitivity, 21.6s TimeCoverageRelationStatistics Valid=16156, Invalid=26074, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 18:51:11,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 18:51:11,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2018-12-03 18:51:11,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 18:51:11,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2018-12-03 18:51:11,010 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2018-12-03 18:51:11,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:51:11,010 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2018-12-03 18:51:11,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 18:51:11,011 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2018-12-03 18:51:11,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 18:51:11,011 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:51:11,011 INFO L402 BasicCegarLoop]: trace histogram [69, 1, 1, 1] [2018-12-03 18:51:11,012 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:51:11,012 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:51:11,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1556284776, now seen corresponding path program 35 times [2018-12-03 18:51:11,012 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:51:11,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:51:11,013 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:51:11,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:51:11,013 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:51:11,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:51:13,673 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:51:13,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:51:13,674 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:51:13,674 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:51:13,674 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:51:13,674 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:51:13,674 INFO 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 18:51:13,682 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:51:13,682 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:51:13,730 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-12-03 18:51:13,730 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:51:13,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:51:13,833 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:51:13,833 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:51:20,840 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:51:20,859 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:51:20,859 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 141 [2018-12-03 18:51:20,860 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:51:20,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-12-03 18:51:20,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-12-03 18:51:20,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7389, Invalid=12633, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 18:51:20,861 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 73 states. [2018-12-03 18:51:21,081 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 8 [2018-12-03 18:51:21,274 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 9 [2018-12-03 18:51:21,478 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 18:51:21,676 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 18:51:21,875 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:51:22,080 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:51:22,284 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:51:22,488 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:51:22,696 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:51:22,911 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:51:23,129 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:51:23,344 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:51:23,548 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:51:23,760 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:51:23,983 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:51:24,212 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:51:24,442 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:51:24,666 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:51:24,883 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:51:25,102 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:51:25,333 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:51:25,548 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:51:25,769 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:51:25,978 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:51:33,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:51:33,639 INFO L93 Difference]: Finished difference Result 77 states and 78 transitions. [2018-12-03 18:51:33,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 18:51:33,640 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 72 [2018-12-03 18:51:33,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:51:33,641 INFO L225 Difference]: With dead ends: 77 [2018-12-03 18:51:33,641 INFO L226 Difference]: Without dead ends: 75 [2018-12-03 18:51:33,644 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2485 ImplicationChecksByTransitivity, 21.8s TimeCoverageRelationStatistics Valid=17049, Invalid=27261, Unknown=0, NotChecked=0, Total=44310 [2018-12-03 18:51:33,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-03 18:51:33,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-12-03 18:51:33,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-03 18:51:33,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-12-03 18:51:33,649 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2018-12-03 18:51:33,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:51:33,650 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-12-03 18:51:33,650 INFO L481 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-12-03 18:51:33,650 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-12-03 18:51:33,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-12-03 18:51:33,650 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:51:33,651 INFO L402 BasicCegarLoop]: trace histogram [71, 1, 1, 1] [2018-12-03 18:51:33,651 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:51:33,651 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:51:33,651 INFO L82 PathProgramCache]: Analyzing trace with hash 940987528, now seen corresponding path program 36 times [2018-12-03 18:51:33,651 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:51:33,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:51:33,652 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:51:33,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:51:33,652 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:51:33,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:51:36,982 INFO L134 CoverageAnalysis]: Checked inductivity of 2556 backedges. 0 proven. 2556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:51:36,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:51:36,983 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:51:36,983 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:51:36,983 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:51:36,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:51:36,983 INFO 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 18:51:36,993 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:51:36,994 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:51:37,304 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:51:37,304 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:51:37,489 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:51:37,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2556 backedges. 0 proven. 2556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:51:37,596 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:51:45,259 INFO L134 CoverageAnalysis]: Checked inductivity of 2556 backedges. 0 proven. 2556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:51:45,278 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:51:45,279 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 146 [2018-12-03 18:51:45,279 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:51:45,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-03 18:51:45,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-03 18:51:45,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7820, Invalid=13642, Unknown=0, NotChecked=0, Total=21462 [2018-12-03 18:51:45,280 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 75 states. [2018-12-03 18:51:45,531 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-12-03 18:51:45,743 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-12-03 18:51:45,944 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 18:51:46,156 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 18:51:46,367 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 18:51:46,579 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 18:51:46,785 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:51:47,001 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:51:47,223 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:51:47,445 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:51:47,666 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:51:47,903 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:51:48,121 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:51:48,336 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:51:48,566 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:51:48,795 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:51:49,016 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:51:49,246 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:51:49,471 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:51:49,701 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:51:49,964 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:51:50,223 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:51:50,449 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:51:50,679 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:51:50,924 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:51:51,147 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:51:59,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:51:59,282 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-12-03 18:51:59,282 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 18:51:59,283 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 74 [2018-12-03 18:51:59,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:51:59,283 INFO L225 Difference]: With dead ends: 79 [2018-12-03 18:51:59,283 INFO L226 Difference]: Without dead ends: 77 [2018-12-03 18:51:59,285 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2700 ImplicationChecksByTransitivity, 24.2s TimeCoverageRelationStatistics Valid=18114, Invalid=29192, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 18:51:59,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-12-03 18:51:59,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-12-03 18:51:59,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-12-03 18:51:59,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-12-03 18:51:59,291 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2018-12-03 18:51:59,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:51:59,291 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-12-03 18:51:59,291 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-03 18:51:59,291 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-12-03 18:51:59,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-12-03 18:51:59,292 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:51:59,292 INFO L402 BasicCegarLoop]: trace histogram [73, 1, 1, 1] [2018-12-03 18:51:59,292 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:51:59,292 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:51:59,292 INFO L82 PathProgramCache]: Analyzing trace with hash -1949148248, now seen corresponding path program 37 times [2018-12-03 18:51:59,293 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:51:59,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:51:59,295 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:51:59,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:51:59,295 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:51:59,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:52:02,512 INFO L134 CoverageAnalysis]: Checked inductivity of 2701 backedges. 0 proven. 2701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:52:02,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:52:02,513 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:52:02,513 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:52:02,513 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:52:02,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:52:02,513 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:52:02,529 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:52:02,530 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:52:02,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:52:03,091 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:52:03,231 INFO L134 CoverageAnalysis]: Checked inductivity of 2701 backedges. 0 proven. 2701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:52:03,231 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:52:11,208 INFO L134 CoverageAnalysis]: Checked inductivity of 2701 backedges. 0 proven. 2701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:52:11,227 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:52:11,227 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 150 [2018-12-03 18:52:11,227 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:52:11,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 18:52:11,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 18:52:11,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8259, Invalid=14391, Unknown=0, NotChecked=0, Total=22650 [2018-12-03 18:52:11,229 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 77 states. [2018-12-03 18:52:11,457 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2018-12-03 18:52:11,672 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 9 [2018-12-03 18:52:11,896 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 18:52:12,114 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 18:52:12,350 WARN L180 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 18:52:12,573 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 18:52:12,803 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 18:52:13,033 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 18:52:13,259 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:52:13,490 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:52:13,720 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:52:13,955 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:52:14,179 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:52:14,404 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:52:14,652 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:52:14,900 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:52:15,133 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:52:15,385 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:52:15,654 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:52:15,899 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:52:16,134 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:52:16,369 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:52:16,604 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:52:16,839 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:52:17,076 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:52:17,325 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:52:17,805 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:52:26,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:52:26,196 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2018-12-03 18:52:26,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 18:52:26,197 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 76 [2018-12-03 18:52:26,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:52:26,198 INFO L225 Difference]: With dead ends: 81 [2018-12-03 18:52:26,198 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 18:52:26,199 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2849 ImplicationChecksByTransitivity, 25.5s TimeCoverageRelationStatistics Valid=19135, Invalid=30817, Unknown=0, NotChecked=0, Total=49952 [2018-12-03 18:52:26,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 18:52:26,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-12-03 18:52:26,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-12-03 18:52:26,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-12-03 18:52:26,203 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2018-12-03 18:52:26,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:52:26,203 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-12-03 18:52:26,203 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 18:52:26,204 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-12-03 18:52:26,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-12-03 18:52:26,204 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:52:26,204 INFO L402 BasicCegarLoop]: trace histogram [75, 1, 1, 1] [2018-12-03 18:52:26,204 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:52:26,204 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:52:26,204 INFO L82 PathProgramCache]: Analyzing trace with hash -525788472, now seen corresponding path program 38 times [2018-12-03 18:52:26,205 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:52:26,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:52:26,205 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:52:26,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:52:26,205 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:52:26,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:52:29,510 INFO L134 CoverageAnalysis]: Checked inductivity of 2850 backedges. 0 proven. 2850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:52:29,510 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:52:29,510 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:52:29,510 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:52:29,511 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:52:29,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:52:29,511 INFO 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 18:52:29,527 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:52:29,527 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:52:29,636 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-12-03 18:52:29,636 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:52:29,640 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:52:29,742 INFO L134 CoverageAnalysis]: Checked inductivity of 2850 backedges. 0 proven. 2850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:52:29,742 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:52:37,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2850 backedges. 0 proven. 2850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:52:37,995 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:52:37,995 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 153 [2018-12-03 18:52:37,995 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:52:37,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-12-03 18:52:37,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-12-03 18:52:37,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8706, Invalid=14856, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 18:52:37,997 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 79 states. [2018-12-03 18:52:38,227 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 8 [2018-12-03 18:52:38,447 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 9 [2018-12-03 18:52:38,688 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 18:52:38,904 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 18:52:39,138 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 18:52:39,360 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 18:52:39,589 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 18:52:39,818 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 18:52:40,064 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 18:52:40,302 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 18:52:40,571 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:52:40,824 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:52:41,099 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:52:41,361 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:52:41,614 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:52:41,858 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:52:42,104 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:52:42,356 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:52:42,597 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:52:42,860 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:52:43,106 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:52:43,355 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:52:43,603 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:52:43,846 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:52:44,096 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:52:44,342 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:52:44,594 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:52:44,844 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:52:45,095 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:52:53,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:52:53,799 INFO L93 Difference]: Finished difference Result 83 states and 84 transitions. [2018-12-03 18:52:53,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-12-03 18:52:53,800 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 78 [2018-12-03 18:52:53,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:52:53,801 INFO L225 Difference]: With dead ends: 83 [2018-12-03 18:52:53,801 INFO L226 Difference]: Without dead ends: 81 [2018-12-03 18:52:53,803 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2926 ImplicationChecksByTransitivity, 26.4s TimeCoverageRelationStatistics Valid=20106, Invalid=32106, Unknown=0, NotChecked=0, Total=52212 [2018-12-03 18:52:53,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-12-03 18:52:53,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-12-03 18:52:53,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-03 18:52:53,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-12-03 18:52:53,808 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2018-12-03 18:52:53,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:52:53,808 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-12-03 18:52:53,808 INFO L481 AbstractCegarLoop]: Interpolant automaton has 79 states. [2018-12-03 18:52:53,808 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-12-03 18:52:53,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-12-03 18:52:53,809 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:52:53,809 INFO L402 BasicCegarLoop]: trace histogram [77, 1, 1, 1] [2018-12-03 18:52:53,809 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:52:53,809 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:52:53,809 INFO L82 PathProgramCache]: Analyzing trace with hash 1523356136, now seen corresponding path program 39 times [2018-12-03 18:52:53,809 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:52:53,810 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:52:53,810 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:52:53,810 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:52:53,810 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:52:54,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:52:57,364 INFO L134 CoverageAnalysis]: Checked inductivity of 3003 backedges. 0 proven. 3003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:52:57,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:52:57,365 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:52:57,365 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:52:57,365 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:52:57,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:52:57,365 INFO 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 18:52:57,375 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:52:57,375 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:52:57,785 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:52:57,785 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:52:58,021 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:52:58,145 INFO L134 CoverageAnalysis]: Checked inductivity of 3003 backedges. 0 proven. 3003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:52:58,145 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:53:07,036 INFO L134 CoverageAnalysis]: Checked inductivity of 3003 backedges. 0 proven. 3003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:53:07,055 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:53:07,055 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 158 [2018-12-03 18:53:07,055 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:53:07,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-12-03 18:53:07,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-12-03 18:53:07,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9173, Invalid=15949, Unknown=0, NotChecked=0, Total=25122 [2018-12-03 18:53:07,057 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 81 states. [2018-12-03 18:53:07,302 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 8 [2018-12-03 18:53:07,527 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 9 [2018-12-03 18:53:07,785 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 18:53:08,023 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 18:53:08,271 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 18:53:08,511 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 18:53:08,752 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 18:53:08,987 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 18:53:09,237 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 18:53:09,489 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 18:53:09,753 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 18:53:10,008 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 18:53:10,251 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:53:10,492 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:53:10,748 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:53:10,994 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:53:11,254 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:53:11,512 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:53:11,807 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:53:12,082 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:53:12,345 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:53:12,605 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:53:12,870 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:53:13,125 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:53:13,391 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:53:13,652 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:53:13,909 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:53:14,184 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:53:14,438 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:53:14,688 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:53:15,203 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:53:15,714 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 18:53:23,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:53:23,940 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2018-12-03 18:53:23,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 18:53:23,940 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 80 [2018-12-03 18:53:23,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:53:23,941 INFO L225 Difference]: With dead ends: 85 [2018-12-03 18:53:23,942 INFO L226 Difference]: Without dead ends: 83 [2018-12-03 18:53:23,943 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3159 ImplicationChecksByTransitivity, 28.6s TimeCoverageRelationStatistics Valid=21261, Invalid=34199, Unknown=0, NotChecked=0, Total=55460 [2018-12-03 18:53:23,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-12-03 18:53:23,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2018-12-03 18:53:23,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-12-03 18:53:23,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-12-03 18:53:23,948 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2018-12-03 18:53:23,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:53:23,948 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-12-03 18:53:23,948 INFO L481 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-12-03 18:53:23,948 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-12-03 18:53:23,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-12-03 18:53:23,948 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:53:23,948 INFO L402 BasicCegarLoop]: trace histogram [79, 1, 1, 1] [2018-12-03 18:53:23,949 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:53:23,949 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:53:23,949 INFO L82 PathProgramCache]: Analyzing trace with hash -638664440, now seen corresponding path program 40 times [2018-12-03 18:53:23,949 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:53:23,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:53:23,950 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:53:23,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:53:23,950 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:53:24,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:53:27,677 INFO L134 CoverageAnalysis]: Checked inductivity of 3160 backedges. 0 proven. 3160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:53:27,677 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:53:27,677 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:53:27,677 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:53:27,678 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:53:27,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:53:27,678 INFO 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 18:53:27,687 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:53:27,687 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:53:28,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:53:28,356 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:53:28,468 INFO L134 CoverageAnalysis]: Checked inductivity of 3160 backedges. 0 proven. 3160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:53:28,469 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:53:37,727 INFO L134 CoverageAnalysis]: Checked inductivity of 3160 backedges. 0 proven. 3160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:53:37,746 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:53:37,746 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 162 [2018-12-03 18:53:37,746 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:53:37,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 18:53:37,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 18:53:37,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9648, Invalid=16758, Unknown=0, NotChecked=0, Total=26406 [2018-12-03 18:53:37,748 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 83 states. [2018-12-03 18:53:38,027 WARN L180 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 8 [2018-12-03 18:53:38,269 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 9 [2018-12-03 18:53:38,528 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 18:53:38,790 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 18:53:39,050 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 18:53:39,292 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 18:53:39,541 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 18:53:39,800 WARN L180 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 18:53:40,065 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 18:53:40,328 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 18:53:40,583 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 18:53:40,844 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 18:53:41,098 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 18:53:41,350 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 18:53:41,633 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:53:41,904 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:53:42,170 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:53:42,451 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:53:42,747 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:53:43,020 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:53:43,300 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:53:43,589 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:53:43,879 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:53:44,157 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:53:44,433 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:53:44,714 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:53:44,986 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:53:45,258 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:53:45,534 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:53:45,803 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:53:46,070 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:53:46,330 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:53:46,595 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:53:47,656 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 18:53:55,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:53:55,831 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2018-12-03 18:53:55,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 18:53:55,831 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 82 [2018-12-03 18:53:55,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:53:55,832 INFO L225 Difference]: With dead ends: 87 [2018-12-03 18:53:55,832 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 18:53:55,833 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3320 ImplicationChecksByTransitivity, 30.3s TimeCoverageRelationStatistics Valid=22366, Invalid=35956, Unknown=0, NotChecked=0, Total=58322 [2018-12-03 18:53:55,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 18:53:55,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2018-12-03 18:53:55,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-12-03 18:53:55,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2018-12-03 18:53:55,838 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2018-12-03 18:53:55,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:53:55,839 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2018-12-03 18:53:55,839 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 18:53:55,839 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2018-12-03 18:53:55,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-12-03 18:53:55,839 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:53:55,839 INFO L402 BasicCegarLoop]: trace histogram [81, 1, 1, 1] [2018-12-03 18:53:55,840 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:53:55,840 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:53:55,840 INFO L82 PathProgramCache]: Analyzing trace with hash 423733288, now seen corresponding path program 41 times [2018-12-03 18:53:55,840 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:53:55,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:53:55,841 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:53:55,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:53:55,841 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:53:56,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:53:59,798 INFO L134 CoverageAnalysis]: Checked inductivity of 3321 backedges. 0 proven. 3321 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:53:59,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:53:59,799 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:53:59,799 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:53:59,799 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:53:59,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:53:59,799 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:53:59,810 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:53:59,810 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:53:59,870 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-12-03 18:53:59,870 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:53:59,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:54:00,013 INFO L134 CoverageAnalysis]: Checked inductivity of 3321 backedges. 0 proven. 3321 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:54:00,013 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:54:09,710 INFO L134 CoverageAnalysis]: Checked inductivity of 3321 backedges. 0 proven. 3321 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:54:09,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:54:09,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 165 [2018-12-03 18:54:09,731 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:54:09,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-12-03 18:54:09,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-12-03 18:54:09,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10131, Invalid=17259, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 18:54:09,732 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 85 states. [2018-12-03 18:54:09,990 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 8 [2018-12-03 18:54:10,239 WARN L180 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 9 [2018-12-03 18:54:10,498 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 18:54:10,756 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 18:54:11,022 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 18:54:11,277 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 18:54:11,539 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 18:54:11,815 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 18:54:12,079 WARN L180 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 18:54:12,352 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 18:54:12,621 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 18:54:12,900 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 18:54:13,166 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 18:54:13,448 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 18:54:13,727 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 18:54:14,015 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 18:54:14,287 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:54:14,570 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:54:14,847 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:54:15,130 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:54:15,413 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:54:15,699 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:54:15,988 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:54:16,276 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:54:16,572 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:54:16,863 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:54:17,149 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:54:17,437 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:54:17,712 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:54:17,994 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:54:18,276 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:54:18,571 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:54:18,845 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:54:19,119 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:54:19,395 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:54:19,670 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:54:28,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:54:28,991 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2018-12-03 18:54:28,991 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-12-03 18:54:28,991 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 84 [2018-12-03 18:54:28,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:54:28,992 INFO L225 Difference]: With dead ends: 89 [2018-12-03 18:54:28,992 INFO L226 Difference]: Without dead ends: 87 [2018-12-03 18:54:28,995 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3403 ImplicationChecksByTransitivity, 32.0s TimeCoverageRelationStatistics Valid=23415, Invalid=37347, Unknown=0, NotChecked=0, Total=60762 [2018-12-03 18:54:28,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-12-03 18:54:29,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-12-03 18:54:29,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 18:54:29,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-12-03 18:54:29,002 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2018-12-03 18:54:29,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:54:29,002 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-12-03 18:54:29,002 INFO L481 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-12-03 18:54:29,003 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-12-03 18:54:29,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 18:54:29,003 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:54:29,003 INFO L402 BasicCegarLoop]: trace histogram [83, 1, 1, 1] [2018-12-03 18:54:29,003 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:54:29,004 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:54:29,004 INFO L82 PathProgramCache]: Analyzing trace with hash -814266552, now seen corresponding path program 42 times [2018-12-03 18:54:29,004 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:54:29,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:54:29,005 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:54:29,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:54:29,005 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:54:29,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:54:33,380 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 0 proven. 3486 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:54:33,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:54:33,381 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:54:33,381 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:54:33,381 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:54:33,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:54:33,381 INFO 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 18:54:33,400 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:54:33,400 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:54:33,898 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:54:33,898 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:54:34,189 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:54:34,308 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 0 proven. 3486 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:54:34,308 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:54:44,717 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 0 proven. 3486 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:54:44,737 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:54:44,737 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 170 [2018-12-03 18:54:44,737 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:54:44,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-12-03 18:54:44,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-12-03 18:54:44,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10634, Invalid=18436, Unknown=0, NotChecked=0, Total=29070 [2018-12-03 18:54:44,738 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 87 states. [2018-12-03 18:54:45,017 WARN L180 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 8 [2018-12-03 18:54:45,274 WARN L180 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 9 [2018-12-03 18:54:45,541 WARN L180 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 18:54:45,818 WARN L180 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 18:54:46,092 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 18:54:46,357 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 18:54:46,625 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 18:54:46,894 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 18:54:47,176 WARN L180 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 18:54:47,462 WARN L180 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 18:54:47,733 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 18:54:48,021 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 18:54:48,296 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 18:54:48,574 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 18:54:48,865 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 18:54:49,184 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 18:54:49,496 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 18:54:49,795 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 18:54:50,087 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:54:50,378 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:54:50,672 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:54:50,970 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:54:51,273 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:54:51,569 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:54:51,883 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:54:52,183 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:54:52,477 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:54:52,776 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:54:53,079 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:54:53,366 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:54:53,673 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:54:53,961 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:54:54,276 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:54:54,570 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:54:54,852 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:54:55,128 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:54:55,427 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:54:55,707 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:54:55,979 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 18:55:05,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:05,360 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2018-12-03 18:55:05,360 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 18:55:05,360 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 86 [2018-12-03 18:55:05,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:05,361 INFO L225 Difference]: With dead ends: 91 [2018-12-03 18:55:05,361 INFO L226 Difference]: Without dead ends: 89 [2018-12-03 18:55:05,363 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3654 ImplicationChecksByTransitivity, 34.3s TimeCoverageRelationStatistics Valid=24660, Invalid=39602, Unknown=0, NotChecked=0, Total=64262 [2018-12-03 18:55:05,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-12-03 18:55:05,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-12-03 18:55:05,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-12-03 18:55:05,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-12-03 18:55:05,369 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2018-12-03 18:55:05,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:05,369 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-12-03 18:55:05,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-12-03 18:55:05,369 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-12-03 18:55:05,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-12-03 18:55:05,370 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:05,370 INFO L402 BasicCegarLoop]: trace histogram [85, 1, 1, 1] [2018-12-03 18:55:05,370 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:05,370 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:05,370 INFO L82 PathProgramCache]: Analyzing trace with hash -826171800, now seen corresponding path program 43 times [2018-12-03 18:55:05,370 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:05,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:05,371 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:55:05,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:05,371 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:05,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:09,195 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 0 proven. 3655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:09,196 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:09,196 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:09,196 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:09,196 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:09,196 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:09,196 INFO 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 18:55:09,205 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:55:09,206 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:55:09,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:10,026 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:10,150 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 0 proven. 3655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:10,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:21,020 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 0 proven. 3655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:21,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:21,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 174 [2018-12-03 18:55:21,041 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:21,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 18:55:21,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 18:55:21,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11145, Invalid=19305, Unknown=0, NotChecked=0, Total=30450 [2018-12-03 18:55:21,043 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 89 states. [2018-12-03 18:55:21,332 WARN L180 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 8 [2018-12-03 18:55:21,601 WARN L180 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 9 [2018-12-03 18:55:21,882 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 18:55:22,158 WARN L180 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 18:55:22,439 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 18:55:22,725 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 18:55:23,001 WARN L180 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 18:55:23,284 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 18:55:23,573 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 18:55:23,878 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 18:55:24,165 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 18:55:24,464 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 18:55:24,764 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 18:55:25,081 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 18:55:25,402 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 18:55:25,694 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 18:55:25,995 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 18:55:26,300 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 18:55:26,608 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 18:55:26,928 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 18:55:27,248 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:55:27,567 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:55:27,894 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:55:28,218 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:55:28,537 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:55:28,848 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:55:29,166 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:55:29,478 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:55:29,794 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:55:30,138 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:55:30,451 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:55:30,753 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:55:31,049 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:55:31,350 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:55:31,647 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:55:31,935 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:55:32,235 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:55:32,529 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:55:32,811 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:55:42,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:42,954 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2018-12-03 18:55:42,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 18:55:42,954 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 88 [2018-12-03 18:55:42,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:42,955 INFO L225 Difference]: With dead ends: 93 [2018-12-03 18:55:42,956 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 18:55:42,958 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 258 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3827 ImplicationChecksByTransitivity, 35.7s TimeCoverageRelationStatistics Valid=25849, Invalid=41491, Unknown=0, NotChecked=0, Total=67340 [2018-12-03 18:55:42,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 18:55:42,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-12-03 18:55:42,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-12-03 18:55:42,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2018-12-03 18:55:42,962 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2018-12-03 18:55:42,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:42,963 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2018-12-03 18:55:42,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 18:55:42,963 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2018-12-03 18:55:42,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-12-03 18:55:42,963 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:42,963 INFO L402 BasicCegarLoop]: trace histogram [87, 1, 1, 1] [2018-12-03 18:55:42,963 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:42,964 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:42,964 INFO L82 PathProgramCache]: Analyzing trace with hash 617786760, now seen corresponding path program 44 times [2018-12-03 18:55:42,964 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:42,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:42,964 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:55:42,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:42,964 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:43,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:47,359 INFO L134 CoverageAnalysis]: Checked inductivity of 3828 backedges. 0 proven. 3828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:47,360 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:47,360 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:47,360 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:47,360 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:47,360 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:47,360 INFO 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 18:55:47,370 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:55:47,370 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:55:47,431 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-12-03 18:55:47,431 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:55:47,436 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:47,559 INFO L134 CoverageAnalysis]: Checked inductivity of 3828 backedges. 0 proven. 3828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:47,560 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:58,494 INFO L134 CoverageAnalysis]: Checked inductivity of 3828 backedges. 0 proven. 3828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:58,515 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:58,515 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 177 [2018-12-03 18:55:58,515 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:58,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-12-03 18:55:58,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-12-03 18:55:58,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11664, Invalid=19842, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 18:55:58,517 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 91 states. [2018-12-03 18:55:58,821 WARN L180 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 8 [2018-12-03 18:55:59,106 WARN L180 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 9 [2018-12-03 18:55:59,415 WARN L180 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 18:55:59,709 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 18:56:00,017 WARN L180 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 18:56:00,318 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 18:56:00,633 WARN L180 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 18:56:00,980 WARN L180 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 18:56:01,297 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 18:56:01,617 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 18:56:01,923 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 18:56:02,238 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 18:56:02,543 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 18:56:02,849 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 18:56:03,168 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 18:56:03,478 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 18:56:03,793 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 18:56:04,123 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 18:56:04,445 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 18:56:04,768 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 18:56:05,098 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 18:56:05,421 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 18:56:05,743 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:56:06,104 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:56:06,428 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:56:06,763 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:56:07,091 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:56:07,409 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:56:07,727 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:56:08,052 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:56:08,367 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:56:08,684 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:56:09,001 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:56:09,321 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:56:09,634 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:56:09,946 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:56:10,245 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:56:10,543 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:56:10,838 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:56:11,165 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:56:11,745 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:56:21,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:56:21,884 INFO L93 Difference]: Finished difference Result 95 states and 96 transitions. [2018-12-03 18:56:21,884 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 18:56:21,884 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 90 [2018-12-03 18:56:21,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:56:21,885 INFO L225 Difference]: With dead ends: 95 [2018-12-03 18:56:21,885 INFO L226 Difference]: Without dead ends: 93 [2018-12-03 18:56:21,888 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3916 ImplicationChecksByTransitivity, 37.7s TimeCoverageRelationStatistics Valid=26976, Invalid=42984, Unknown=0, NotChecked=0, Total=69960 [2018-12-03 18:56:21,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-12-03 18:56:21,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-12-03 18:56:21,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-03 18:56:21,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-12-03 18:56:21,894 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2018-12-03 18:56:21,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:56:21,895 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-12-03 18:56:21,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-12-03 18:56:21,895 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-12-03 18:56:21,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-12-03 18:56:21,895 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:56:21,895 INFO L402 BasicCegarLoop]: trace histogram [89, 1, 1, 1] [2018-12-03 18:56:21,895 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:56:21,896 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:56:21,896 INFO L82 PathProgramCache]: Analyzing trace with hash 987526312, now seen corresponding path program 45 times [2018-12-03 18:56:21,896 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:56:21,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:21,896 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:56:21,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:21,897 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:56:22,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:56:26,255 INFO L134 CoverageAnalysis]: Checked inductivity of 4005 backedges. 0 proven. 4005 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:26,255 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:26,255 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:56:26,256 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:56:26,256 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:56:26,256 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:26,256 INFO 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 18:56:26,265 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:56:26,265 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:56:26,845 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:56:26,846 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:56:27,200 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:56:27,314 INFO L134 CoverageAnalysis]: Checked inductivity of 4005 backedges. 0 proven. 4005 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:27,314 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:56:38,779 INFO L134 CoverageAnalysis]: Checked inductivity of 4005 backedges. 0 proven. 4005 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:38,813 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:56:38,813 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 182 [2018-12-03 18:56:38,813 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:56:38,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-12-03 18:56:38,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-12-03 18:56:38,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12203, Invalid=21103, Unknown=0, NotChecked=0, Total=33306 [2018-12-03 18:56:38,815 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 93 states. [2018-12-03 18:56:39,126 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 8 [2018-12-03 18:56:39,415 WARN L180 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 9 [2018-12-03 18:56:39,719 WARN L180 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 18:56:40,048 WARN L180 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 18:56:40,351 WARN L180 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 18:56:40,675 WARN L180 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 18:56:40,973 WARN L180 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 18:56:41,278 WARN L180 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 18:56:41,599 WARN L180 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 18:56:41,942 WARN L180 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 18:56:42,246 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 18:56:42,574 WARN L180 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 18:56:42,886 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 18:56:43,200 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 18:56:43,531 WARN L180 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 18:56:43,857 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 18:56:44,179 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 18:56:44,521 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 18:56:44,871 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 18:56:45,202 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 18:56:45,548 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 18:56:45,882 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 18:56:46,222 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 18:56:46,565 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 18:56:46,928 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:56:47,279 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:56:47,616 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:56:47,952 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:56:48,288 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:56:48,621 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:56:48,970 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:56:49,306 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:56:49,636 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:56:49,959 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:56:50,276 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:56:50,609 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:56:50,936 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:56:51,248 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:56:51,572 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:56:51,889 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:56:52,200 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:56:52,507 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:56:52,808 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:56:54,045 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 18:57:03,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:57:03,572 INFO L93 Difference]: Finished difference Result 97 states and 98 transitions. [2018-12-03 18:57:03,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 18:57:03,572 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 92 [2018-12-03 18:57:03,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:57:03,573 INFO L225 Difference]: With dead ends: 97 [2018-12-03 18:57:03,573 INFO L226 Difference]: Without dead ends: 95 [2018-12-03 18:57:03,575 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 270 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4185 ImplicationChecksByTransitivity, 39.5s TimeCoverageRelationStatistics Valid=28311, Invalid=45401, Unknown=0, NotChecked=0, Total=73712 [2018-12-03 18:57:03,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-12-03 18:57:03,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2018-12-03 18:57:03,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-12-03 18:57:03,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-12-03 18:57:03,584 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2018-12-03 18:57:03,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:57:03,585 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-12-03 18:57:03,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-12-03 18:57:03,585 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-12-03 18:57:03,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-12-03 18:57:03,586 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:57:03,586 INFO L402 BasicCegarLoop]: trace histogram [91, 1, 1, 1] [2018-12-03 18:57:03,586 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:57:03,586 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:57:03,586 INFO L82 PathProgramCache]: Analyzing trace with hash -175049784, now seen corresponding path program 46 times [2018-12-03 18:57:03,586 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:57:03,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:57:03,587 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:57:03,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:57:03,587 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:57:04,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:57:09,332 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:09,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:57:09,332 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:57:09,332 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:57:09,332 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:57:09,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:57:09,333 INFO 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 18:57:09,342 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:57:09,342 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:57:09,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:57:10,347 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:57:10,498 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:10,498 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:57:22,948 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:22,980 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:57:22,980 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 186 [2018-12-03 18:57:22,980 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:57:22,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 18:57:22,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 18:57:22,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12750, Invalid=22032, Unknown=0, NotChecked=0, Total=34782 [2018-12-03 18:57:22,982 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 95 states. [2018-12-03 18:57:23,297 WARN L180 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 8 [2018-12-03 18:57:23,598 WARN L180 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 9 [2018-12-03 18:57:23,908 WARN L180 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 18:57:24,256 WARN L180 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 18:57:24,579 WARN L180 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 18:57:24,891 WARN L180 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 18:57:25,206 WARN L180 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 18:57:25,528 WARN L180 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 18:57:25,860 WARN L180 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 18:57:26,185 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 18:57:26,511 WARN L180 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 18:57:26,841 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 18:57:27,182 WARN L180 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 18:57:27,509 WARN L180 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 18:57:27,868 WARN L180 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 18:57:28,221 WARN L180 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 18:57:28,565 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 18:57:28,955 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 18:57:29,285 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 18:57:29,626 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 18:57:29,971 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 18:57:30,313 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 18:57:30,670 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 18:57:31,019 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 18:57:31,372 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 18:57:31,715 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 18:57:32,070 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:57:32,466 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:57:32,822 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:57:33,179 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:57:33,530 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:57:33,872 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:57:34,215 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:57:34,565 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:57:34,901 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:57:35,241 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:57:35,573 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:57:35,922 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:57:36,248 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:57:36,563 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:57:36,872 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:57:37,184 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:57:37,493 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:57:37,804 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:57:38,133 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:57:38,468 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:57:38,784 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 18:57:49,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:57:49,046 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-12-03 18:57:49,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 18:57:49,047 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 94 [2018-12-03 18:57:49,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:57:49,048 INFO L225 Difference]: With dead ends: 99 [2018-12-03 18:57:49,048 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 18:57:49,050 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 276 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4370 ImplicationChecksByTransitivity, 43.2s TimeCoverageRelationStatistics Valid=29584, Invalid=47422, Unknown=0, NotChecked=0, Total=77006 [2018-12-03 18:57:49,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 18:57:49,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-12-03 18:57:49,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-12-03 18:57:49,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-12-03 18:57:49,056 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2018-12-03 18:57:49,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:57:49,056 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-12-03 18:57:49,056 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 18:57:49,056 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-12-03 18:57:49,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-12-03 18:57:49,057 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:57:49,057 INFO L402 BasicCegarLoop]: trace histogram [93, 1, 1, 1] [2018-12-03 18:57:49,057 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:57:49,057 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:57:49,057 INFO L82 PathProgramCache]: Analyzing trace with hash -719181080, now seen corresponding path program 47 times [2018-12-03 18:57:49,057 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:57:49,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:57:49,058 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:57:49,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:57:49,059 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:57:49,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:57:54,652 INFO L134 CoverageAnalysis]: Checked inductivity of 4371 backedges. 0 proven. 4371 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:54,652 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:57:54,652 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:57:54,652 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:57:54,652 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:57:54,653 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:57:54,653 INFO 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 18:57:54,660 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:57:54,661 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:57:54,727 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-12-03 18:57:54,728 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:57:54,732 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:57:54,869 INFO L134 CoverageAnalysis]: Checked inductivity of 4371 backedges. 0 proven. 4371 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:54,870 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:58:07,265 INFO L134 CoverageAnalysis]: Checked inductivity of 4371 backedges. 0 proven. 4371 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:58:07,286 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:58:07,286 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 189 [2018-12-03 18:58:07,286 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:58:07,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 97 states [2018-12-03 18:58:07,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2018-12-03 18:58:07,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13305, Invalid=22605, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 18:58:07,288 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 97 states. [2018-12-03 18:58:07,633 WARN L180 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 8 [2018-12-03 18:58:07,956 WARN L180 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 9 [2018-12-03 18:58:08,289 WARN L180 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 18:58:08,624 WARN L180 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 18:58:08,979 WARN L180 SmtUtils]: Spent 309.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 18:58:09,315 WARN L180 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 18:58:09,648 WARN L180 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 18:58:09,974 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 18:58:10,310 WARN L180 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 18:58:10,645 WARN L180 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 18:58:11,000 WARN L180 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 18:58:11,389 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 18:58:11,725 WARN L180 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 18:58:12,048 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 18:58:12,402 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 18:58:12,761 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 18:58:13,117 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 18:58:13,472 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 18:58:13,842 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 18:58:14,224 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 18:58:14,584 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 18:58:14,934 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 18:58:15,313 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 18:58:15,676 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 18:58:16,031 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 18:58:16,396 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 18:58:16,765 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 18:58:17,137 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 18:58:17,501 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:58:17,882 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:58:18,239 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:58:18,585 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:58:18,950 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:58:19,331 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:58:19,685 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:58:20,039 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:58:20,401 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:58:20,756 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:58:21,097 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:58:21,426 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:58:21,763 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:58:22,089 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:58:22,413 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:58:22,744 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:58:23,055 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:58:23,382 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:58:23,703 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:58:24,036 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:58:24,384 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 18:58:35,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:58:35,020 INFO L93 Difference]: Finished difference Result 101 states and 102 transitions. [2018-12-03 18:58:35,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-12-03 18:58:35,021 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 96 [2018-12-03 18:58:35,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:58:35,022 INFO L225 Difference]: With dead ends: 101 [2018-12-03 18:58:35,022 INFO L226 Difference]: Without dead ends: 99 [2018-12-03 18:58:35,025 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 281 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4465 ImplicationChecksByTransitivity, 44.6s TimeCoverageRelationStatistics Valid=30789, Invalid=49017, Unknown=0, NotChecked=0, Total=79806 [2018-12-03 18:58:35,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-12-03 18:58:35,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-12-03 18:58:35,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-12-03 18:58:35,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-12-03 18:58:35,030 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2018-12-03 18:58:35,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:58:35,030 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-12-03 18:58:35,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has 97 states. [2018-12-03 18:58:35,030 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-12-03 18:58:35,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-12-03 18:58:35,031 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:58:35,031 INFO L402 BasicCegarLoop]: trace histogram [95, 1, 1, 1] [2018-12-03 18:58:35,031 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:58:35,031 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:58:35,031 INFO L82 PathProgramCache]: Analyzing trace with hash 356653576, now seen corresponding path program 48 times [2018-12-03 18:58:35,031 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:58:35,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:58:35,032 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:58:35,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:58:35,032 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:58:35,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:58:40,154 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 0 proven. 4560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:58:40,155 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:58:40,155 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:58:40,155 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:58:40,155 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:58:40,155 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:58:40,155 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:58:40,164 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:58:40,164 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:58:40,859 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:58:40,859 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:58:41,296 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:58:41,550 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 0 proven. 4560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:58:41,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:58:54,979 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 0 proven. 4560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:58:54,998 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:58:54,998 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 194 [2018-12-03 18:58:54,998 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:58:54,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-12-03 18:58:54,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-12-03 18:58:55,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13880, Invalid=23950, Unknown=0, NotChecked=0, Total=37830 [2018-12-03 18:58:55,000 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 99 states. [2018-12-03 18:58:55,426 WARN L180 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 8 [2018-12-03 18:58:55,745 WARN L180 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 9 [2018-12-03 18:58:56,073 WARN L180 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 18:58:56,421 WARN L180 SmtUtils]: Spent 309.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 18:58:56,759 WARN L180 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 18:58:57,082 WARN L180 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 18:58:57,421 WARN L180 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 18:58:57,754 WARN L180 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 18:58:58,103 WARN L180 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 18:58:58,462 WARN L180 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 18:58:58,804 WARN L180 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 18:58:59,154 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 18:58:59,489 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 18:58:59,825 WARN L180 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 18:59:00,210 WARN L180 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 18:59:00,573 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 18:59:00,931 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 18:59:01,300 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 18:59:01,675 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 18:59:02,047 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 18:59:02,423 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 18:59:02,789 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 18:59:03,168 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 18:59:03,533 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 18:59:03,908 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 18:59:04,282 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 18:59:04,661 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 18:59:05,044 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 18:59:05,434 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 18:59:05,816 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 18:59:06,182 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:59:06,560 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:59:06,934 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:59:07,306 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:59:07,678 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:59:08,048 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:59:08,409 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:59:08,786 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:59:09,153 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:59:09,502 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:59:09,848 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:59:10,211 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:59:10,590 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:59:10,926 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:59:11,259 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:59:11,600 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:59:11,947 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:59:12,282 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:59:12,623 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:59:13,294 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 18:59:15,268 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 11 [2018-12-03 18:59:24,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:59:24,076 INFO L93 Difference]: Finished difference Result 103 states and 104 transitions. [2018-12-03 18:59:24,076 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 18:59:24,076 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 98 [2018-12-03 18:59:24,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:59:24,078 INFO L225 Difference]: With dead ends: 103 [2018-12-03 18:59:24,078 INFO L226 Difference]: Without dead ends: 101 [2018-12-03 18:59:24,081 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 288 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4752 ImplicationChecksByTransitivity, 46.5s TimeCoverageRelationStatistics Valid=32214, Invalid=51596, Unknown=0, NotChecked=0, Total=83810 [2018-12-03 18:59:24,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-12-03 18:59:24,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2018-12-03 18:59:24,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-12-03 18:59:24,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-12-03 18:59:24,089 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2018-12-03 18:59:24,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:59:24,089 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-12-03 18:59:24,089 INFO L481 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-12-03 18:59:24,089 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-12-03 18:59:24,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-12-03 18:59:24,090 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:59:24,090 INFO L402 BasicCegarLoop]: trace histogram [97, 1, 1, 1] [2018-12-03 18:59:24,090 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:59:24,090 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:59:24,090 INFO L82 PathProgramCache]: Analyzing trace with hash -853360344, now seen corresponding path program 49 times [2018-12-03 18:59:24,090 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:59:24,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:59:24,091 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:59:24,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:59:24,091 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:59:24,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:59:29,552 INFO L134 CoverageAnalysis]: Checked inductivity of 4753 backedges. 0 proven. 4753 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:59:29,552 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:59:29,552 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:59:29,552 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:59:29,553 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:59:29,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:59:29,553 INFO 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 18:59:29,562 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:59:29,562 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:59:30,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:59:30,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:59:31,979 INFO L134 CoverageAnalysis]: Checked inductivity of 4753 backedges. 0 proven. 4753 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:59:31,980 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:59:45,585 INFO L134 CoverageAnalysis]: Checked inductivity of 4753 backedges. 0 proven. 4753 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:59:45,604 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:59:45,604 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 198 [2018-12-03 18:59:45,604 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:59:45,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 18:59:45,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 18:59:45,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14463, Invalid=24939, Unknown=0, NotChecked=0, Total=39402 [2018-12-03 18:59:45,606 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 101 states. [2018-12-03 18:59:45,970 WARN L180 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 8 [2018-12-03 18:59:46,324 WARN L180 SmtUtils]: Spent 325.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 9 [2018-12-03 18:59:46,666 WARN L180 SmtUtils]: Spent 308.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2018-12-03 18:59:47,011 WARN L180 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2018-12-03 18:59:47,362 WARN L180 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 18:59:47,723 WARN L180 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 18:59:48,074 WARN L180 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 18:59:48,428 WARN L180 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 18:59:48,779 WARN L180 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 18:59:49,136 WARN L180 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 18:59:49,498 WARN L180 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 18:59:49,857 WARN L180 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 18:59:50,222 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 18:59:50,573 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 18:59:50,947 WARN L180 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 18:59:51,338 WARN L180 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 18:59:51,702 WARN L180 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 18:59:52,080 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 18:59:52,450 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 18:59:52,850 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 18:59:53,244 WARN L180 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 18:59:53,623 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 18:59:54,014 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 18:59:54,391 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 18:59:54,781 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 18:59:55,172 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11