java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_exp_cong.epf -i ../../../trunk/examples/programs/20170319-ConjunctivePathPrograms/count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 15:08:52,285 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 15:08:52,287 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 15:08:52,298 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 15:08:52,299 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 15:08:52,300 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 15:08:52,301 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 15:08:52,303 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 15:08:52,305 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 15:08:52,305 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 15:08:52,306 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-12-03 15:08:52,338 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_exp_cong.epf [2018-12-03 15:08:52,365 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 15:08:52,366 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 15:08:52,366 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 15:08:52,367 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 15:08:52,367 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 15:08:52,367 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 15:08:52,367 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 15:08:52,368 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 15:08:52,371 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-03 15:08:52,371 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 15:08:52,371 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-03 15:08:52,371 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 15:08:52,372 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 15:08:52,372 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 15:08:52,372 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 15:08:52,374 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 15:08:52,374 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 15:08:52,374 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 15:08:52,375 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 15:08:52,375 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 15:08:52,375 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 15:08:52,375 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 15:08:52,376 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 15:08:52,376 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 15:08:52,376 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 15:08:52,376 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 15:08:52,376 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 15:08:52,377 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 15:08:52,377 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 15:08:52,377 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 15:08:52,377 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 15:08:52,377 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 15:08:52,378 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 15:08:52,378 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 15:08:52,378 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 15:08:52,378 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 15:08:52,378 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 15:08:52,380 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 15:08:52,380 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 15:08:52,380 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 15:08:52,380 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 15:08:52,414 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 15:08:52,429 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 15:08:52,433 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 15:08:52,435 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 15:08:52,436 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 15:08:52,436 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170319-ConjunctivePathPrograms/count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl [2018-12-03 15:08:52,437 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170319-ConjunctivePathPrograms/count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl' [2018-12-03 15:08:52,482 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 15:08:52,484 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 15:08:52,485 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 15:08:52,485 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 15:08:52,485 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 15:08:52,505 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 03:08:52" (1/1) ... [2018-12-03 15:08:52,514 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 03:08:52" (1/1) ... [2018-12-03 15:08:52,524 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 15:08:52,525 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 15:08:52,525 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 15:08:52,525 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 15:08:52,538 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 03:08:52" (1/1) ... [2018-12-03 15:08:52,539 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 03:08:52" (1/1) ... [2018-12-03 15:08:52,539 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 03:08:52" (1/1) ... [2018-12-03 15:08:52,540 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 03:08:52" (1/1) ... [2018-12-03 15:08:52,544 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 03:08:52" (1/1) ... [2018-12-03 15:08:52,547 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 03:08:52" (1/1) ... [2018-12-03 15:08:52,548 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 03:08:52" (1/1) ... [2018-12-03 15:08:52,549 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 15:08:52,553 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 15:08:52,553 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 15:08:52,554 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 15:08:52,557 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 03:08:52" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 15:08:52,628 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2018-12-03 15:08:52,628 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 15:08:52,628 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 15:08:52,849 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 15:08:52,849 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-03 15:08:52,850 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 03:08:52 BoogieIcfgContainer [2018-12-03 15:08:52,850 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 15:08:52,851 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 15:08:52,851 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 15:08:52,854 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 15:08:52,855 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 03:08:52" (1/2) ... [2018-12-03 15:08:52,856 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15e1e053 and model type count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 03:08:52, skipping insertion in model container [2018-12-03 15:08:52,856 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 03:08:52" (2/2) ... [2018-12-03 15:08:52,858 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl [2018-12-03 15:08:52,866 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 15:08:52,874 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 15:08:52,892 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 15:08:52,928 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 15:08:52,928 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 15:08:52,929 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 15:08:52,929 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 15:08:52,929 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 15:08:52,929 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 15:08:52,929 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 15:08:52,930 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 15:08:52,945 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-12-03 15:08:52,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-12-03 15:08:52,951 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:52,952 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-12-03 15:08:52,955 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:52,961 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:52,962 INFO L82 PathProgramCache]: Analyzing trace with hash 30017, now seen corresponding path program 1 times [2018-12-03 15:08:52,964 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:53,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:53,018 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:53,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:53,018 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:53,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:53,162 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:53,164 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 15:08:53,165 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-03 15:08:53,165 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:08:53,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 15:08:53,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 15:08:53,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 15:08:53,185 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-12-03 15:08:53,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:53,227 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 15:08:53,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 15:08:53,229 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-12-03 15:08:53,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:53,243 INFO L225 Difference]: With dead ends: 9 [2018-12-03 15:08:53,243 INFO L226 Difference]: Without dead ends: 5 [2018-12-03 15:08:53,247 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 15:08:53,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-12-03 15:08:53,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-12-03 15:08:53,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-12-03 15:08:53,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 5 transitions. [2018-12-03 15:08:53,315 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 5 transitions. Word has length 3 [2018-12-03 15:08:53,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:53,315 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 5 transitions. [2018-12-03 15:08:53,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 15:08:53,316 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-12-03 15:08:53,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-03 15:08:53,316 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:53,316 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-03 15:08:53,320 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:53,320 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:53,320 INFO L82 PathProgramCache]: Analyzing trace with hash 928552, now seen corresponding path program 1 times [2018-12-03 15:08:53,320 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:53,321 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:53,325 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:53,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:53,325 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:53,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:53,428 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:53,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:53,429 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:53,430 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 5 with the following transitions: [2018-12-03 15:08:53,431 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9] [2018-12-03 15:08:53,475 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:08:53,475 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:08:53,653 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:08:53,655 INFO L272 AbstractInterpreter]: Visited 4 different actions 10 times. Merged at 3 different actions 6 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 15:08:53,670 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:53,672 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:08:53,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:53,672 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:08:53,689 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:53,689 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:53,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:53,711 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:53,771 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:53,772 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:53,865 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 15:08:53,887 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:53,887 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2018-12-03 15:08:53,887 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:53,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 15:08:53,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 15:08:53,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-12-03 15:08:53,889 INFO L87 Difference]: Start difference. First operand 5 states and 5 transitions. Second operand 5 states. [2018-12-03 15:08:53,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:53,958 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 15:08:53,959 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 15:08:53,959 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 4 [2018-12-03 15:08:53,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:53,959 INFO L225 Difference]: With dead ends: 9 [2018-12-03 15:08:53,960 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 15:08:53,961 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 15:08:53,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 15:08:53,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 15:08:53,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 15:08:53,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-12-03 15:08:53,965 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-12-03 15:08:53,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:53,965 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-12-03 15:08:53,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 15:08:53,966 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-12-03 15:08:53,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 15:08:53,966 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:53,966 INFO L402 BasicCegarLoop]: trace histogram [3, 1, 1, 1] [2018-12-03 15:08:53,967 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:53,967 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:53,967 INFO L82 PathProgramCache]: Analyzing trace with hash 892275272, now seen corresponding path program 2 times [2018-12-03 15:08:53,967 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:53,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:53,969 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:53,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:53,969 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:53,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:54,102 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 15:08:54,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:54,103 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:54,103 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:08:54,103 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:08:54,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:54,104 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:08:54,114 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:08:54,114 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:08:54,144 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 15:08:54,145 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:08:54,146 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:54,280 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 15:08:54,280 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:54,547 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 15:08:54,566 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:54,566 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-12-03 15:08:54,566 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:54,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:08:54,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:08:54,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2018-12-03 15:08:54,569 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 7 states. [2018-12-03 15:08:54,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:54,763 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-12-03 15:08:54,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 15:08:54,764 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 6 [2018-12-03 15:08:54,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:54,765 INFO L225 Difference]: With dead ends: 11 [2018-12-03 15:08:54,765 INFO L226 Difference]: Without dead ends: 9 [2018-12-03 15:08:54,766 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 15:08:54,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-12-03 15:08:54,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-12-03 15:08:54,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 15:08:54,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-12-03 15:08:54,771 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-12-03 15:08:54,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:54,772 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-12-03 15:08:54,772 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:08:54,772 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-12-03 15:08:54,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 15:08:54,773 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:54,773 INFO L402 BasicCegarLoop]: trace histogram [5, 1, 1, 1] [2018-12-03 15:08:54,773 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:54,773 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:54,774 INFO L82 PathProgramCache]: Analyzing trace with hash -1516986008, now seen corresponding path program 3 times [2018-12-03 15:08:54,774 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:54,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:54,775 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:08:54,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:54,776 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:54,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:54,966 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 15:08:54,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:54,967 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:54,967 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:08:54,967 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:08:54,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:54,967 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 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:08:54,976 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:08:54,976 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:08:54,986 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:08:54,987 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:08:54,988 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:55,061 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 15:08:55,061 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:55,644 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 15:08:55,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:55,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2018-12-03 15:08:55,665 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:55,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 15:08:55,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 15:08:55,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=145, Unknown=0, NotChecked=0, Total=210 [2018-12-03 15:08:55,667 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 9 states. [2018-12-03 15:08:55,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:55,849 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2018-12-03 15:08:55,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 15:08:55,850 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 8 [2018-12-03 15:08:55,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:55,850 INFO L225 Difference]: With dead ends: 13 [2018-12-03 15:08:55,851 INFO L226 Difference]: Without dead ends: 11 [2018-12-03 15:08:55,851 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=129, Invalid=251, Unknown=0, NotChecked=0, Total=380 [2018-12-03 15:08:55,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-12-03 15:08:55,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-12-03 15:08:55,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-12-03 15:08:55,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-12-03 15:08:55,856 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-12-03 15:08:55,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:55,856 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-12-03 15:08:55,856 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 15:08:55,857 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-12-03 15:08:55,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 15:08:55,857 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:55,857 INFO L402 BasicCegarLoop]: trace histogram [7, 1, 1, 1] [2018-12-03 15:08:55,858 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:55,858 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:55,858 INFO L82 PathProgramCache]: Analyzing trace with hash -1829703544, now seen corresponding path program 4 times [2018-12-03 15:08:55,858 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:55,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:55,859 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:08:55,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:55,860 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:55,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:55,999 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 15:08:56,000 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:56,000 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:56,000 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:08:56,001 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:08:56,001 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:56,001 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:08:56,013 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:56,013 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:08:56,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:56,025 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:56,082 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 15:08:56,083 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:56,452 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 15:08:56,471 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:56,471 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2018-12-03 15:08:56,471 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:56,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 15:08:56,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 15:08:56,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2018-12-03 15:08:56,473 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 11 states. [2018-12-03 15:08:56,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:56,744 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2018-12-03 15:08:56,744 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 15:08:56,744 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 10 [2018-12-03 15:08:56,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:56,745 INFO L225 Difference]: With dead ends: 15 [2018-12-03 15:08:56,745 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 15:08:56,746 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2018-12-03 15:08:56,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 15:08:56,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-12-03 15:08:56,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-12-03 15:08:56,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-12-03 15:08:56,750 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-12-03 15:08:56,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:56,751 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-12-03 15:08:56,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 15:08:56,751 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-12-03 15:08:56,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 15:08:56,752 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:56,752 INFO L402 BasicCegarLoop]: trace histogram [9, 1, 1, 1] [2018-12-03 15:08:56,752 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:56,752 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:56,752 INFO L82 PathProgramCache]: Analyzing trace with hash -1703544920, now seen corresponding path program 5 times [2018-12-03 15:08:56,753 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:56,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:56,754 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:08:56,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:56,754 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:56,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:57,227 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 15:08:57,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:57,228 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:57,228 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:08:57,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:08:57,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:57,229 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:08:57,238 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:08:57,238 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:08:57,250 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 15:08:57,250 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:08:57,252 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:57,280 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 15:08:57,281 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:57,563 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 15:08:57,582 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:57,583 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-12-03 15:08:57,583 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:57,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 15:08:57,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 15:08:57,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=303, Unknown=0, NotChecked=0, Total=462 [2018-12-03 15:08:57,584 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 13 states. [2018-12-03 15:08:57,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:57,966 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2018-12-03 15:08:57,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 15:08:57,967 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 12 [2018-12-03 15:08:57,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:57,968 INFO L225 Difference]: With dead ends: 17 [2018-12-03 15:08:57,968 INFO L226 Difference]: Without dead ends: 15 [2018-12-03 15:08:57,969 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=339, Invalid=591, Unknown=0, NotChecked=0, Total=930 [2018-12-03 15:08:57,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-12-03 15:08:57,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-12-03 15:08:57,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 15:08:57,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-12-03 15:08:57,973 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-12-03 15:08:57,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:57,973 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-12-03 15:08:57,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 15:08:57,974 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-12-03 15:08:57,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 15:08:57,974 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:57,974 INFO L402 BasicCegarLoop]: trace histogram [11, 1, 1, 1] [2018-12-03 15:08:57,975 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:57,975 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:57,975 INFO L82 PathProgramCache]: Analyzing trace with hash -724191544, now seen corresponding path program 6 times [2018-12-03 15:08:57,975 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:57,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:57,977 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:08:57,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:57,977 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:58,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:08:58,256 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 15:08:58,257 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:58,257 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:08:58,257 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:08:58,258 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:08:58,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:08:58,258 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:08:58,275 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:08:58,275 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:08:58,314 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:08:58,314 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:08:58,317 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:08:58,503 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 15:08:58,503 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:08:58,897 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 15:08:58,918 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:08:58,918 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2018-12-03 15:08:58,918 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:08:58,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 15:08:58,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 15:08:58,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=472, Unknown=0, NotChecked=0, Total=702 [2018-12-03 15:08:58,920 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 15 states. [2018-12-03 15:08:59,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:08:59,485 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2018-12-03 15:08:59,487 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 15:08:59,487 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 14 [2018-12-03 15:08:59,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:08:59,488 INFO L225 Difference]: With dead ends: 19 [2018-12-03 15:08:59,488 INFO L226 Difference]: Without dead ends: 17 [2018-12-03 15:08:59,489 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=504, Invalid=902, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 15:08:59,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-12-03 15:08:59,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-12-03 15:08:59,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-03 15:08:59,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-12-03 15:08:59,493 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-12-03 15:08:59,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:08:59,494 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-12-03 15:08:59,494 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 15:08:59,494 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-12-03 15:08:59,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 15:08:59,495 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:08:59,495 INFO L402 BasicCegarLoop]: trace histogram [13, 1, 1, 1] [2018-12-03 15:08:59,497 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:08:59,497 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:08:59,497 INFO L82 PathProgramCache]: Analyzing trace with hash -163435032, now seen corresponding path program 7 times [2018-12-03 15:08:59,497 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:08:59,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:59,498 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:08:59,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:08:59,499 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:08:59,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:00,067 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 15:09:00,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:00,067 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:00,067 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:00,067 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:00,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:00,068 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:00,079 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:00,079 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:00,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:00,099 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:00,157 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 15:09:00,157 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:00,608 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 15:09:00,628 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:00,629 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 30 [2018-12-03 15:09:00,629 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:00,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 15:09:00,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 15:09:00,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=621, Unknown=0, NotChecked=0, Total=930 [2018-12-03 15:09:00,630 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 17 states. [2018-12-03 15:09:01,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:01,102 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2018-12-03 15:09:01,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 15:09:01,103 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 16 [2018-12-03 15:09:01,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:01,104 INFO L225 Difference]: With dead ends: 21 [2018-12-03 15:09:01,104 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 15:09:01,106 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=685, Invalid=1207, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 15:09:01,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 15:09:01,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-12-03 15:09:01,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 15:09:01,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-12-03 15:09:01,111 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-12-03 15:09:01,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:01,111 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-12-03 15:09:01,111 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 15:09:01,111 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-12-03 15:09:01,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 15:09:01,112 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:01,112 INFO L402 BasicCegarLoop]: trace histogram [15, 1, 1, 1] [2018-12-03 15:09:01,112 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:01,113 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:01,113 INFO L82 PathProgramCache]: Analyzing trace with hash 1852661000, now seen corresponding path program 8 times [2018-12-03 15:09:01,113 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:01,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:01,114 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:01,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:01,114 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:01,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:01,360 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 15:09:01,360 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:01,360 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:01,360 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:01,361 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:01,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:01,361 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:01,371 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:09:01,371 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:09:01,405 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 15:09:01,405 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:09:01,407 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:01,502 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 15:09:01,503 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:02,160 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 15:09:02,179 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:02,179 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-12-03 15:09:02,179 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:02,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 15:09:02,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 15:09:02,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=396, Invalid=726, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 15:09:02,181 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 19 states. [2018-12-03 15:09:02,826 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 11 [2018-12-03 15:09:03,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:03,621 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2018-12-03 15:09:03,621 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 15:09:03,621 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 18 [2018-12-03 15:09:03,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:03,622 INFO L225 Difference]: With dead ends: 23 [2018-12-03 15:09:03,622 INFO L226 Difference]: Without dead ends: 21 [2018-12-03 15:09:03,624 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 15:09:03,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-12-03 15:09:03,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-12-03 15:09:03,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 15:09:03,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-12-03 15:09:03,629 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-12-03 15:09:03,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:03,629 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-12-03 15:09:03,629 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 15:09:03,629 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-12-03 15:09:03,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 15:09:03,630 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:03,630 INFO L402 BasicCegarLoop]: trace histogram [17, 1, 1, 1] [2018-12-03 15:09:03,630 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:03,631 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:03,631 INFO L82 PathProgramCache]: Analyzing trace with hash -2004270040, now seen corresponding path program 9 times [2018-12-03 15:09:03,631 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:03,632 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:03,632 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:09:03,632 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:03,632 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:03,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:03,925 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 15:09:03,925 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:03,926 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:03,926 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:03,926 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:03,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:03,926 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:03,935 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:09:03,935 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:09:03,974 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:09:03,974 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:09:03,981 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:04,199 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 15:09:04,199 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:04,848 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 15:09:04,874 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:04,875 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 38 [2018-12-03 15:09:04,875 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:04,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 15:09:04,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 15:09:04,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=503, Invalid=979, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 15:09:04,876 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 21 states. [2018-12-03 15:09:05,305 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 11 [2018-12-03 15:09:05,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:05,778 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-12-03 15:09:05,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 15:09:05,778 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 20 [2018-12-03 15:09:05,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:05,779 INFO L225 Difference]: With dead ends: 25 [2018-12-03 15:09:05,780 INFO L226 Difference]: Without dead ends: 23 [2018-12-03 15:09:05,781 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1131, Invalid=1949, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 15:09:05,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-03 15:09:05,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-12-03 15:09:05,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-12-03 15:09:05,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-12-03 15:09:05,786 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-12-03 15:09:05,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:05,786 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-12-03 15:09:05,786 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 15:09:05,786 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-12-03 15:09:05,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-12-03 15:09:05,787 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:05,787 INFO L402 BasicCegarLoop]: trace histogram [19, 1, 1, 1] [2018-12-03 15:09:05,788 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:05,788 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:05,788 INFO L82 PathProgramCache]: Analyzing trace with hash -1958223032, now seen corresponding path program 10 times [2018-12-03 15:09:05,788 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:05,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:05,789 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:09:05,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:05,789 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:05,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:06,176 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 15:09:06,177 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:06,177 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:06,177 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:06,177 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:06,177 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:06,177 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:06,186 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:06,187 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:06,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:06,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:06,272 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 15:09:06,272 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:07,203 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 15:09:07,222 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:07,222 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 42 [2018-12-03 15:09:07,222 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:07,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 15:09:07,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 15:09:07,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=618, Invalid=1188, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 15:09:07,223 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 23 states. [2018-12-03 15:09:08,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:08,103 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2018-12-03 15:09:08,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 15:09:08,103 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 22 [2018-12-03 15:09:08,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:08,104 INFO L225 Difference]: With dead ends: 27 [2018-12-03 15:09:08,104 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 15:09:08,107 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1396, Invalid=2386, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 15:09:08,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 15:09:08,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-12-03 15:09:08,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 15:09:08,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-12-03 15:09:08,112 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-12-03 15:09:08,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:08,112 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-12-03 15:09:08,112 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 15:09:08,112 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-12-03 15:09:08,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 15:09:08,113 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:08,113 INFO L402 BasicCegarLoop]: trace histogram [21, 1, 1, 1] [2018-12-03 15:09:08,113 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:08,113 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:08,113 INFO L82 PathProgramCache]: Analyzing trace with hash -656721304, now seen corresponding path program 11 times [2018-12-03 15:09:08,114 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:08,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:08,115 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:08,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:08,115 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:08,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:08,436 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 15:09:08,436 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:08,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:08,437 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:08,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:08,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:08,438 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:08,454 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:09:08,454 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:09:08,494 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-03 15:09:08,495 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:09:08,497 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:08,540 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 15:09:08,540 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:09,663 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 15:09:09,681 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:09,682 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-12-03 15:09:09,682 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:09,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-03 15:09:09,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-03 15:09:09,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=1329, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 15:09:09,683 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 25 states. [2018-12-03 15:09:10,622 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2018-12-03 15:09:10,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:10,782 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2018-12-03 15:09:10,784 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 15:09:10,784 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 24 [2018-12-03 15:09:10,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:10,785 INFO L225 Difference]: With dead ends: 29 [2018-12-03 15:09:10,785 INFO L226 Difference]: Without dead ends: 27 [2018-12-03 15:09:10,787 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1665, Invalid=2757, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 15:09:10,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-03 15:09:10,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-03 15:09:10,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 15:09:10,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-12-03 15:09:10,792 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-12-03 15:09:10,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:10,792 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-12-03 15:09:10,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-03 15:09:10,792 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-12-03 15:09:10,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 15:09:10,793 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:10,793 INFO L402 BasicCegarLoop]: trace histogram [23, 1, 1, 1] [2018-12-03 15:09:10,793 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:10,793 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:10,794 INFO L82 PathProgramCache]: Analyzing trace with hash 250956168, now seen corresponding path program 12 times [2018-12-03 15:09:10,794 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:10,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:10,795 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:09:10,795 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:10,795 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:10,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:11,220 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 15:09:11,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:11,220 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:11,220 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:11,221 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:11,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:11,221 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:11,229 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:09:11,230 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:09:11,280 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:09:11,280 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:09:11,294 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:11,497 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 15:09:11,497 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:12,813 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 15:09:12,833 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:12,833 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2018-12-03 15:09:12,833 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:12,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 15:09:12,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 15:09:12,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=884, Invalid=1666, Unknown=0, NotChecked=0, Total=2550 [2018-12-03 15:09:12,835 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 27 states. [2018-12-03 15:09:14,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:14,547 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-12-03 15:09:14,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 15:09:14,548 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 26 [2018-12-03 15:09:14,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:14,549 INFO L225 Difference]: With dead ends: 31 [2018-12-03 15:09:14,549 INFO L226 Difference]: Without dead ends: 29 [2018-12-03 15:09:14,551 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2010, Invalid=3392, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 15:09:14,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-12-03 15:09:14,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-12-03 15:09:14,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-12-03 15:09:14,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-12-03 15:09:14,556 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-12-03 15:09:14,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:14,557 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-12-03 15:09:14,557 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 15:09:14,557 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-12-03 15:09:14,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-12-03 15:09:14,558 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:14,558 INFO L402 BasicCegarLoop]: trace histogram [25, 1, 1, 1] [2018-12-03 15:09:14,558 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:14,558 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:14,558 INFO L82 PathProgramCache]: Analyzing trace with hash 650645672, now seen corresponding path program 13 times [2018-12-03 15:09:14,558 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:14,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:14,559 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:09:14,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:14,559 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:14,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:14,994 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 15:09:14,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:14,995 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:14,995 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:14,995 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:14,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:14,995 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:15,005 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:15,006 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:15,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:15,045 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:15,109 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 15:09:15,109 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:17,036 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 15:09:17,067 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:17,068 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 54 [2018-12-03 15:09:17,068 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:17,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 15:09:17,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 15:09:17,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1935, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 15:09:17,070 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 29 states. [2018-12-03 15:09:17,547 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 11 [2018-12-03 15:09:18,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:18,790 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2018-12-03 15:09:18,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 15:09:18,790 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 28 [2018-12-03 15:09:18,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:18,791 INFO L225 Difference]: With dead ends: 33 [2018-12-03 15:09:18,791 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 15:09:18,794 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2359, Invalid=3961, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 15:09:18,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 15:09:18,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-12-03 15:09:18,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 15:09:18,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-12-03 15:09:18,798 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-12-03 15:09:18,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:18,799 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-12-03 15:09:18,799 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 15:09:18,799 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-12-03 15:09:18,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 15:09:18,800 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:18,800 INFO L402 BasicCegarLoop]: trace histogram [27, 1, 1, 1] [2018-12-03 15:09:18,800 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:18,800 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:18,800 INFO L82 PathProgramCache]: Analyzing trace with hash -1794797624, now seen corresponding path program 14 times [2018-12-03 15:09:18,800 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:18,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:18,801 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:18,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:18,802 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:18,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:19,422 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 15:09:19,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:19,422 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:19,422 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:19,422 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:19,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:19,422 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:19,435 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:09:19,435 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:09:19,455 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-03 15:09:19,455 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:09:19,457 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:19,502 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 15:09:19,503 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:20,672 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 15:09:20,691 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:20,691 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-12-03 15:09:20,691 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:20,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-12-03 15:09:20,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-12-03 15:09:20,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1194, Invalid=2112, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 15:09:20,693 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 31 states. [2018-12-03 15:09:22,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:22,436 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2018-12-03 15:09:22,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 15:09:22,437 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 30 [2018-12-03 15:09:22,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:22,438 INFO L225 Difference]: With dead ends: 35 [2018-12-03 15:09:22,438 INFO L226 Difference]: Without dead ends: 33 [2018-12-03 15:09:22,441 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2706, Invalid=4434, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 15:09:22,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-03 15:09:22,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-12-03 15:09:22,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-03 15:09:22,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-12-03 15:09:22,446 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-12-03 15:09:22,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:22,447 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-12-03 15:09:22,447 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-12-03 15:09:22,447 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-12-03 15:09:22,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 15:09:22,448 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:22,448 INFO L402 BasicCegarLoop]: trace histogram [29, 1, 1, 1] [2018-12-03 15:09:22,448 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:22,448 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:22,449 INFO L82 PathProgramCache]: Analyzing trace with hash 1776273128, now seen corresponding path program 15 times [2018-12-03 15:09:22,449 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:22,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:22,450 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:09:22,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:22,450 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:22,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:22,997 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 15:09:22,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:22,998 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:22,998 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:22,998 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:22,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:22,998 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:23,009 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:09:23,010 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:09:23,050 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:09:23,050 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:09:23,068 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:23,132 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 15:09:23,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:24,526 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 15:09:24,545 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:24,546 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 62 [2018-12-03 15:09:24,546 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:24,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-12-03 15:09:24,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-12-03 15:09:24,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1373, Invalid=2533, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 15:09:24,548 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 33 states. [2018-12-03 15:09:26,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:26,386 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-12-03 15:09:26,386 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 15:09:26,387 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 32 [2018-12-03 15:09:26,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:26,388 INFO L225 Difference]: With dead ends: 37 [2018-12-03 15:09:26,388 INFO L226 Difference]: Without dead ends: 35 [2018-12-03 15:09:26,390 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 15:09:26,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-12-03 15:09:26,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-12-03 15:09:26,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-12-03 15:09:26,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-12-03 15:09:26,395 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-12-03 15:09:26,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:26,395 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-12-03 15:09:26,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-12-03 15:09:26,396 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-12-03 15:09:26,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-12-03 15:09:26,397 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:26,397 INFO L402 BasicCegarLoop]: trace histogram [31, 1, 1, 1] [2018-12-03 15:09:26,397 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:26,397 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:26,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1896396296, now seen corresponding path program 16 times [2018-12-03 15:09:26,397 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:26,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:26,398 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:09:26,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:26,398 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:26,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:26,997 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 15:09:26,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:26,997 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:26,997 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:26,997 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:26,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:26,998 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:27,006 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:27,006 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:27,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:27,071 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:27,185 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 15:09:27,185 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:28,767 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 15:09:28,786 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:28,786 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 66 [2018-12-03 15:09:28,786 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:28,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 15:09:28,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 15:09:28,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1560, Invalid=2862, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 15:09:28,788 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 35 states. [2018-12-03 15:09:30,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:30,853 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-12-03 15:09:30,853 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 15:09:30,853 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 34 [2018-12-03 15:09:30,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:30,854 INFO L225 Difference]: With dead ends: 39 [2018-12-03 15:09:30,854 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 15:09:30,855 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3574, Invalid=5932, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 15:09:30,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 15:09:30,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-12-03 15:09:30,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 15:09:30,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-12-03 15:09:30,859 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-12-03 15:09:30,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:30,859 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-12-03 15:09:30,859 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 15:09:30,859 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-12-03 15:09:30,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-12-03 15:09:30,859 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:30,860 INFO L402 BasicCegarLoop]: trace histogram [33, 1, 1, 1] [2018-12-03 15:09:30,860 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:30,860 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:30,860 INFO L82 PathProgramCache]: Analyzing trace with hash 1370643752, now seen corresponding path program 17 times [2018-12-03 15:09:30,860 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:30,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:30,861 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:30,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:30,861 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:30,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:31,500 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 15:09:31,501 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:31,501 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:31,501 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:31,501 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:31,501 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:31,501 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:31,512 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:09:31,512 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:09:31,552 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-03 15:09:31,552 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:09:31,554 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:31,612 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 15:09:31,612 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:33,498 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 15:09:33,516 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:33,517 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-12-03 15:09:33,517 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:33,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-12-03 15:09:33,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-12-03 15:09:33,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1755, Invalid=3075, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 15:09:33,518 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 37 states. [2018-12-03 15:09:36,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:36,022 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2018-12-03 15:09:36,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 15:09:36,023 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 36 [2018-12-03 15:09:36,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:36,024 INFO L225 Difference]: With dead ends: 41 [2018-12-03 15:09:36,024 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 15:09:36,026 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3999, Invalid=6507, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 15:09:36,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 15:09:36,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-12-03 15:09:36,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 15:09:36,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-12-03 15:09:36,033 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-12-03 15:09:36,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:36,033 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-12-03 15:09:36,033 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-12-03 15:09:36,033 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-12-03 15:09:36,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 15:09:36,034 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:36,034 INFO L402 BasicCegarLoop]: trace histogram [35, 1, 1, 1] [2018-12-03 15:09:36,034 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:36,035 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:36,035 INFO L82 PathProgramCache]: Analyzing trace with hash -1366377400, now seen corresponding path program 18 times [2018-12-03 15:09:36,035 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:36,036 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:36,036 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:09:36,036 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:36,036 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:36,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:36,848 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 15:09:36,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:36,849 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:36,849 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:36,849 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:36,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:36,849 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:36,859 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:09:36,859 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:09:36,912 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:09:36,912 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:09:36,941 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:37,021 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 15:09:37,021 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:39,265 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 15:09:39,285 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:39,285 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 74 [2018-12-03 15:09:39,285 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:39,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-12-03 15:09:39,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-12-03 15:09:39,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1970, Invalid=3580, Unknown=0, NotChecked=0, Total=5550 [2018-12-03 15:09:39,287 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 39 states. [2018-12-03 15:09:41,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:41,964 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-12-03 15:09:41,965 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 15:09:41,965 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 38 [2018-12-03 15:09:41,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:41,966 INFO L225 Difference]: With dead ends: 43 [2018-12-03 15:09:41,966 INFO L226 Difference]: Without dead ends: 41 [2018-12-03 15:09:41,968 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 702 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=4524, Invalid=7466, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 15:09:41,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-12-03 15:09:41,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-12-03 15:09:41,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-12-03 15:09:41,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-12-03 15:09:41,974 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-12-03 15:09:41,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:41,974 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-12-03 15:09:41,974 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-12-03 15:09:41,974 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-12-03 15:09:41,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-12-03 15:09:41,975 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:41,975 INFO L402 BasicCegarLoop]: trace histogram [37, 1, 1, 1] [2018-12-03 15:09:41,975 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:41,975 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:41,976 INFO L82 PathProgramCache]: Analyzing trace with hash 1171247976, now seen corresponding path program 19 times [2018-12-03 15:09:41,976 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:41,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:41,977 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:09:41,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:41,977 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:42,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:43,317 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 15:09:43,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:43,317 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:43,318 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:43,318 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:43,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:43,318 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:43,327 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:43,328 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:09:43,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:43,420 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:43,501 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 15:09:43,502 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:45,551 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 15:09:45,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:45,570 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 78 [2018-12-03 15:09:45,570 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:45,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 15:09:45,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 15:09:45,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2193, Invalid=3969, Unknown=0, NotChecked=0, Total=6162 [2018-12-03 15:09:45,572 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 41 states. [2018-12-03 15:09:48,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:48,692 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2018-12-03 15:09:48,692 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 15:09:48,692 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 40 [2018-12-03 15:09:48,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:48,693 INFO L225 Difference]: With dead ends: 45 [2018-12-03 15:09:48,693 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 15:09:48,695 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 15:09:48,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 15:09:48,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-12-03 15:09:48,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-12-03 15:09:48,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-12-03 15:09:48,700 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2018-12-03 15:09:48,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:48,701 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-12-03 15:09:48,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 15:09:48,701 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-12-03 15:09:48,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 15:09:48,701 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:48,702 INFO L402 BasicCegarLoop]: trace histogram [39, 1, 1, 1] [2018-12-03 15:09:48,702 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:48,702 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:48,702 INFO L82 PathProgramCache]: Analyzing trace with hash 287810184, now seen corresponding path program 20 times [2018-12-03 15:09:48,702 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:48,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:48,703 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:09:48,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:48,703 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:48,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:49,609 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 15:09:49,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:49,609 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:49,610 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:49,610 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:49,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:49,610 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:49,620 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:09:49,620 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:09:49,647 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-12-03 15:09:49,647 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:09:49,651 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:49,711 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 15:09:49,711 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:51,951 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 15:09:51,969 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:51,970 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-12-03 15:09:51,970 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:51,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-12-03 15:09:51,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-12-03 15:09:51,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2424, Invalid=4218, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 15:09:51,972 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 43 states. [2018-12-03 15:09:55,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:09:55,436 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2018-12-03 15:09:55,436 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 15:09:55,436 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 42 [2018-12-03 15:09:55,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:09:55,437 INFO L225 Difference]: With dead ends: 47 [2018-12-03 15:09:55,437 INFO L226 Difference]: Without dead ends: 45 [2018-12-03 15:09:55,439 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=5544, Invalid=8976, Unknown=0, NotChecked=0, Total=14520 [2018-12-03 15:09:55,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-12-03 15:09:55,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-12-03 15:09:55,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 15:09:55,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-12-03 15:09:55,445 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2018-12-03 15:09:55,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:09:55,446 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-12-03 15:09:55,446 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-12-03 15:09:55,446 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-12-03 15:09:55,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 15:09:55,447 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:09:55,447 INFO L402 BasicCegarLoop]: trace histogram [41, 1, 1, 1] [2018-12-03 15:09:55,447 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:09:55,447 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:09:55,447 INFO L82 PathProgramCache]: Analyzing trace with hash 1707616680, now seen corresponding path program 21 times [2018-12-03 15:09:55,448 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:09:55,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:55,448 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:09:55,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:09:55,449 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:09:55,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:09:56,591 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 15:09:56,592 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:56,592 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:09:56,592 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:09:56,592 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:09:56,592 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:09:56,592 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:09:56,601 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:09:56,601 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:09:56,680 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:09:56,681 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:09:56,719 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:09:56,818 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 15:09:56,818 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:09:59,505 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 15:09:59,523 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:09:59,524 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 86 [2018-12-03 15:09:59,524 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:09:59,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 15:09:59,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 15:09:59,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2675, Invalid=4807, Unknown=0, NotChecked=0, Total=7482 [2018-12-03 15:09:59,525 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 45 states. [2018-12-03 15:10:03,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:10:03,507 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-12-03 15:10:03,510 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 15:10:03,511 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 44 [2018-12-03 15:10:03,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:10:03,511 INFO L225 Difference]: With dead ends: 49 [2018-12-03 15:10:03,512 INFO L226 Difference]: Without dead ends: 47 [2018-12-03 15:10:03,513 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 945 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=6159, Invalid=10097, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 15:10:03,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-12-03 15:10:03,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-12-03 15:10:03,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-12-03 15:10:03,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-12-03 15:10:03,519 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2018-12-03 15:10:03,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:10:03,519 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-12-03 15:10:03,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 15:10:03,520 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-12-03 15:10:03,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-12-03 15:10:03,521 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:10:03,521 INFO L402 BasicCegarLoop]: trace histogram [43, 1, 1, 1] [2018-12-03 15:10:03,521 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:10:03,521 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:03,521 INFO L82 PathProgramCache]: Analyzing trace with hash 342059208, now seen corresponding path program 22 times [2018-12-03 15:10:03,521 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:10:03,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:03,522 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:10:03,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:03,522 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:10:03,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:04,581 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 15:10:04,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:04,582 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:10:04,582 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:10:04,582 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:10:04,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:04,582 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 15:10:04,590 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:04,590 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:10:04,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:04,726 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:10:04,803 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 15:10:04,804 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:10:07,495 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 15:10:07,515 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:10:07,515 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 90 [2018-12-03 15:10:07,515 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:10:07,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 15:10:07,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 15:10:07,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2934, Invalid=5256, Unknown=0, NotChecked=0, Total=8190 [2018-12-03 15:10:07,517 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 47 states. [2018-12-03 15:10:11,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:10:11,674 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2018-12-03 15:10:11,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 15:10:11,675 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 46 [2018-12-03 15:10:11,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:10:11,676 INFO L225 Difference]: With dead ends: 51 [2018-12-03 15:10:11,676 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 15:10:11,677 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1034 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=6760, Invalid=11062, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 15:10:11,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 15:10:11,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-12-03 15:10:11,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 15:10:11,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-12-03 15:10:11,685 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2018-12-03 15:10:11,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:10:11,685 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-12-03 15:10:11,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 15:10:11,685 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-12-03 15:10:11,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 15:10:11,686 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:10:11,686 INFO L402 BasicCegarLoop]: trace histogram [45, 1, 1, 1] [2018-12-03 15:10:11,686 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:10:11,686 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:11,686 INFO L82 PathProgramCache]: Analyzing trace with hash -1993646104, now seen corresponding path program 23 times [2018-12-03 15:10:11,686 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:10:11,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:11,687 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:11,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:11,687 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:10:11,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:13,343 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 15:10:13,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:13,344 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:10:13,344 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:10:13,344 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:10:13,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:13,344 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:10:13,365 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:10:13,366 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:10:13,445 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 15:10:13,446 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:10:13,448 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:10:13,704 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 15:10:13,704 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:10:16,568 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 15:10:16,587 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:10:16,588 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-12-03 15:10:16,588 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:10:16,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-12-03 15:10:16,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-12-03 15:10:16,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3201, Invalid=5541, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 15:10:16,589 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 49 states. [2018-12-03 15:10:21,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:10:21,136 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2018-12-03 15:10:21,137 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-12-03 15:10:21,137 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 48 [2018-12-03 15:10:21,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:10:21,138 INFO L225 Difference]: With dead ends: 53 [2018-12-03 15:10:21,138 INFO L226 Difference]: Without dead ends: 51 [2018-12-03 15:10:21,139 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1081 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=7341, Invalid=11841, Unknown=0, NotChecked=0, Total=19182 [2018-12-03 15:10:21,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-12-03 15:10:21,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-12-03 15:10:21,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 15:10:21,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-12-03 15:10:21,144 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2018-12-03 15:10:21,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:10:21,145 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-12-03 15:10:21,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-12-03 15:10:21,145 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-12-03 15:10:21,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 15:10:21,145 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:10:21,145 INFO L402 BasicCegarLoop]: trace histogram [47, 1, 1, 1] [2018-12-03 15:10:21,146 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:10:21,146 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:21,146 INFO L82 PathProgramCache]: Analyzing trace with hash -338555128, now seen corresponding path program 24 times [2018-12-03 15:10:21,146 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:10:21,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:21,147 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:10:21,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:21,147 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:10:21,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:22,377 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 15:10:22,377 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:22,377 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:10:22,377 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:10:22,378 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:10:22,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:22,378 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:10:22,389 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:10:22,389 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:10:22,496 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:10:22,496 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:10:22,555 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:10:22,629 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 15:10:22,629 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:10:26,078 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 15:10:26,097 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:10:26,097 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 98 [2018-12-03 15:10:26,097 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:10:26,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-12-03 15:10:26,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-12-03 15:10:26,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3488, Invalid=6214, Unknown=0, NotChecked=0, Total=9702 [2018-12-03 15:10:26,099 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 51 states. [2018-12-03 15:10:26,240 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 8 [2018-12-03 15:10:26,365 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 9 [2018-12-03 15:10:26,732 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 15:10:31,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:10:31,282 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-12-03 15:10:31,282 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 15:10:31,282 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 50 [2018-12-03 15:10:31,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:10:31,283 INFO L225 Difference]: With dead ends: 55 [2018-12-03 15:10:31,283 INFO L226 Difference]: Without dead ends: 53 [2018-12-03 15:10:31,284 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1224 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=8046, Invalid=13124, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 15:10:31,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-12-03 15:10:31,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-12-03 15:10:31,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-12-03 15:10:31,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-12-03 15:10:31,289 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2018-12-03 15:10:31,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:10:31,289 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-12-03 15:10:31,289 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-12-03 15:10:31,289 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-12-03 15:10:31,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-12-03 15:10:31,289 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:10:31,290 INFO L402 BasicCegarLoop]: trace histogram [49, 1, 1, 1] [2018-12-03 15:10:31,290 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:10:31,290 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:31,290 INFO L82 PathProgramCache]: Analyzing trace with hash 1065973288, now seen corresponding path program 25 times [2018-12-03 15:10:31,290 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:10:31,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:31,291 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:10:31,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:31,291 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:10:31,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:32,657 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 15:10:32,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:32,657 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:10:32,657 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:10:32,657 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:10:32,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:32,657 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:10:32,666 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:32,666 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:10:32,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:32,851 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:10:32,928 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 15:10:32,928 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:10:36,631 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 15:10:36,650 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:10:36,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 102 [2018-12-03 15:10:36,650 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:10:36,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 15:10:36,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 15:10:36,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3783, Invalid=6723, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 15:10:36,652 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 53 states. [2018-12-03 15:10:36,782 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 8 [2018-12-03 15:10:36,905 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 9 [2018-12-03 15:10:37,029 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:10:37,153 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:10:37,279 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:10:42,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:10:42,303 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2018-12-03 15:10:42,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 15:10:42,305 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 52 [2018-12-03 15:10:42,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:10:42,306 INFO L225 Difference]: With dead ends: 57 [2018-12-03 15:10:42,306 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 15:10:42,308 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1325 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=8731, Invalid=14221, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 15:10:42,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 15:10:42,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-12-03 15:10:42,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-03 15:10:42,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-12-03 15:10:42,313 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2018-12-03 15:10:42,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:10:42,313 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-12-03 15:10:42,313 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 15:10:42,313 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-12-03 15:10:42,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 15:10:42,314 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:10:42,314 INFO L402 BasicCegarLoop]: trace histogram [51, 1, 1, 1] [2018-12-03 15:10:42,315 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:10:42,315 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:42,315 INFO L82 PathProgramCache]: Analyzing trace with hash -2096917176, now seen corresponding path program 26 times [2018-12-03 15:10:42,315 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:10:42,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:42,316 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:10:42,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:42,316 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:10:42,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:43,775 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 15:10:43,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:43,775 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:10:43,775 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:10:43,775 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:10:43,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:43,775 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:10:43,784 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:10:43,784 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:10:43,827 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-12-03 15:10:43,827 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:10:43,831 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:10:43,944 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 15:10:43,945 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:10:47,721 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 15:10:47,739 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:10:47,739 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-12-03 15:10:47,739 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:10:47,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 15:10:47,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 15:10:47,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4086, Invalid=7044, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 15:10:47,741 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 55 states. [2018-12-03 15:10:47,873 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 8 [2018-12-03 15:10:47,999 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 9 [2018-12-03 15:10:48,129 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:10:48,260 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:10:48,395 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:10:48,534 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:10:49,090 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-12-03 15:10:53,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:10:53,858 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2018-12-03 15:10:53,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 15:10:53,859 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 54 [2018-12-03 15:10:53,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:10:53,859 INFO L225 Difference]: With dead ends: 59 [2018-12-03 15:10:53,860 INFO L226 Difference]: Without dead ends: 57 [2018-12-03 15:10:53,861 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1378 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=9390, Invalid=15102, Unknown=0, NotChecked=0, Total=24492 [2018-12-03 15:10:53,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-12-03 15:10:53,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-12-03 15:10:53,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-03 15:10:53,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-12-03 15:10:53,866 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2018-12-03 15:10:53,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:10:53,866 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-12-03 15:10:53,867 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 15:10:53,867 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-12-03 15:10:53,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-12-03 15:10:53,867 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:10:53,867 INFO L402 BasicCegarLoop]: trace histogram [53, 1, 1, 1] [2018-12-03 15:10:53,867 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:10:53,868 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:10:53,868 INFO L82 PathProgramCache]: Analyzing trace with hash -797807512, now seen corresponding path program 27 times [2018-12-03 15:10:53,868 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:10:53,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:53,869 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:10:53,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:10:53,869 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:10:54,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:10:55,633 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 15:10:55,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:55,634 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:10:55,634 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:10:55,634 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:10:55,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:10:55,634 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:10:55,644 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:10:55,645 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:10:55,790 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:10:55,790 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:10:55,869 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:10:56,052 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 15:10:56,053 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:11:00,467 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 15:11:00,486 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:11:00,486 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 110 [2018-12-03 15:11:00,486 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:11:00,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-12-03 15:11:00,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-12-03 15:11:00,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4409, Invalid=7801, Unknown=0, NotChecked=0, Total=12210 [2018-12-03 15:11:00,488 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 57 states. [2018-12-03 15:11:00,632 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-12-03 15:11:00,771 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-12-03 15:11:00,922 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:11:01,063 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:11:01,205 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:11:01,334 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:11:01,469 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:11:01,757 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:11:04,862 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 11 [2018-12-03 15:11:07,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:11:07,377 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-12-03 15:11:07,378 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 15:11:07,378 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 56 [2018-12-03 15:11:07,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:11:07,379 INFO L225 Difference]: With dead ends: 61 [2018-12-03 15:11:07,379 INFO L226 Difference]: Without dead ends: 59 [2018-12-03 15:11:07,380 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1539 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=10185, Invalid=16547, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 15:11:07,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-12-03 15:11:07,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-12-03 15:11:07,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-12-03 15:11:07,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-12-03 15:11:07,386 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2018-12-03 15:11:07,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:11:07,386 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-12-03 15:11:07,386 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-12-03 15:11:07,386 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-12-03 15:11:07,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-12-03 15:11:07,387 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:11:07,387 INFO L402 BasicCegarLoop]: trace histogram [55, 1, 1, 1] [2018-12-03 15:11:07,387 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:11:07,387 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:07,388 INFO L82 PathProgramCache]: Analyzing trace with hash 2106063752, now seen corresponding path program 28 times [2018-12-03 15:11:07,388 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:11:07,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:07,389 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:11:07,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:07,389 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:11:07,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:09,127 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 15:11:09,127 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:09,127 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:11:09,128 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:11:09,128 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:11:09,128 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:09,128 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:11:09,137 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:11:09,137 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:11:09,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:09,385 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:11:09,539 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 15:11:09,540 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:11:14,034 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 15:11:14,052 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:11:14,053 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 114 [2018-12-03 15:11:14,053 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:11:14,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 15:11:14,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 15:11:14,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4740, Invalid=8370, Unknown=0, NotChecked=0, Total=13110 [2018-12-03 15:11:14,055 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 59 states. [2018-12-03 15:11:14,206 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-12-03 15:11:14,348 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 9 [2018-12-03 15:11:14,517 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:11:14,687 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:11:14,846 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:11:15,000 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:11:15,148 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:11:15,302 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:11:15,465 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:11:15,622 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:11:21,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:11:21,544 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-12-03 15:11:21,544 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 15:11:21,544 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 58 [2018-12-03 15:11:21,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:11:21,545 INFO L225 Difference]: With dead ends: 63 [2018-12-03 15:11:21,545 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 15:11:21,547 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1652 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=10954, Invalid=17776, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 15:11:21,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 15:11:21,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-12-03 15:11:21,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-12-03 15:11:21,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-12-03 15:11:21,555 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2018-12-03 15:11:21,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:11:21,555 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-12-03 15:11:21,555 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 15:11:21,555 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-12-03 15:11:21,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-12-03 15:11:21,556 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:11:21,556 INFO L402 BasicCegarLoop]: trace histogram [57, 1, 1, 1] [2018-12-03 15:11:21,556 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:11:21,556 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:21,556 INFO L82 PathProgramCache]: Analyzing trace with hash 997606056, now seen corresponding path program 29 times [2018-12-03 15:11:21,557 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:11:21,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:21,557 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:11:21,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:21,558 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:11:21,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:23,451 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 15:11:23,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:23,452 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:11:23,452 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:11:23,452 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:11:23,452 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:23,452 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:11:23,461 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:11:23,461 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:11:23,508 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-03 15:11:23,508 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:11:23,510 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:11:23,609 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 15:11:23,610 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:11:28,274 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 15:11:28,294 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:11:28,294 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 117 [2018-12-03 15:11:28,294 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:11:28,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-12-03 15:11:28,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-12-03 15:11:28,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5079, Invalid=8727, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 15:11:28,296 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 61 states. [2018-12-03 15:11:28,459 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 8 [2018-12-03 15:11:28,608 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 9 [2018-12-03 15:11:28,760 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:11:28,911 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:11:29,066 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:11:29,213 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:11:29,363 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:11:29,517 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:11:29,672 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:11:29,844 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:11:30,011 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:11:30,186 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:11:36,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:11:36,600 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2018-12-03 15:11:36,600 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-12-03 15:11:36,600 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 60 [2018-12-03 15:11:36,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:11:36,601 INFO L225 Difference]: With dead ends: 65 [2018-12-03 15:11:36,601 INFO L226 Difference]: Without dead ends: 63 [2018-12-03 15:11:36,603 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1711 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=11691, Invalid=18759, Unknown=0, NotChecked=0, Total=30450 [2018-12-03 15:11:36,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-12-03 15:11:36,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-12-03 15:11:36,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 15:11:36,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-12-03 15:11:36,608 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2018-12-03 15:11:36,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:11:36,608 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-12-03 15:11:36,608 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-12-03 15:11:36,609 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-12-03 15:11:36,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 15:11:36,609 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:11:36,609 INFO L402 BasicCegarLoop]: trace histogram [59, 1, 1, 1] [2018-12-03 15:11:36,609 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:11:36,610 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:36,610 INFO L82 PathProgramCache]: Analyzing trace with hash 921649608, now seen corresponding path program 30 times [2018-12-03 15:11:36,610 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:11:36,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:36,611 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:11:36,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:36,611 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:11:36,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:38,483 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 15:11:38,484 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:38,484 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:11:38,484 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:11:38,484 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:11:38,484 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:38,484 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:11:38,497 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:11:38,497 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:11:38,690 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:11:38,691 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:11:38,800 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:11:38,892 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 15:11:38,892 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:11:44,107 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 15:11:44,126 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:11:44,126 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 122 [2018-12-03 15:11:44,126 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:11:44,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 15:11:44,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 15:11:44,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5438, Invalid=9568, Unknown=0, NotChecked=0, Total=15006 [2018-12-03 15:11:44,131 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 63 states. [2018-12-03 15:11:44,343 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-12-03 15:11:44,501 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-12-03 15:11:44,663 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:11:44,825 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:11:44,991 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:11:45,150 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:11:45,322 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:11:45,501 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:11:45,691 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:11:45,858 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:11:46,022 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:11:46,183 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:11:46,690 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:11:52,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:11:52,900 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-12-03 15:11:52,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 15:11:52,900 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 62 [2018-12-03 15:11:52,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:11:52,901 INFO L225 Difference]: With dead ends: 67 [2018-12-03 15:11:52,901 INFO L226 Difference]: Without dead ends: 65 [2018-12-03 15:11:52,902 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1890 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=12576, Invalid=20366, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 15:11:52,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-12-03 15:11:52,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2018-12-03 15:11:52,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-12-03 15:11:52,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-12-03 15:11:52,907 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2018-12-03 15:11:52,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:11:52,907 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-12-03 15:11:52,907 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 15:11:52,907 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-12-03 15:11:52,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-12-03 15:11:52,908 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:11:52,908 INFO L402 BasicCegarLoop]: trace histogram [61, 1, 1, 1] [2018-12-03 15:11:52,908 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:11:52,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:11:52,908 INFO L82 PathProgramCache]: Analyzing trace with hash 941947112, now seen corresponding path program 31 times [2018-12-03 15:11:52,908 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:11:52,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:52,909 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:11:52,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:11:52,909 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:11:53,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:55,011 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 15:11:55,012 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:55,012 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:11:55,012 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:11:55,012 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:11:55,012 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:11:55,012 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:11:55,020 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:11:55,021 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:11:55,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:11:55,345 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:11:55,450 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 15:11:55,450 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:12:02,095 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 15:12:02,114 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:12:02,115 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 126 [2018-12-03 15:12:02,115 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:12:02,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 15:12:02,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 15:12:02,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5805, Invalid=10197, Unknown=0, NotChecked=0, Total=16002 [2018-12-03 15:12:02,116 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 65 states. [2018-12-03 15:12:02,294 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-12-03 15:12:02,458 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 9 [2018-12-03 15:12:02,631 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:12:02,798 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:12:02,970 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:12:03,139 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:12:03,309 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:12:03,477 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:12:03,653 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:12:03,833 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:12:04,004 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:12:04,181 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:12:04,359 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:12:04,532 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:12:04,709 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:12:04,898 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:12:05,819 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 11 [2018-12-03 15:12:11,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:12:11,704 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-12-03 15:12:11,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 15:12:11,705 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 64 [2018-12-03 15:12:11,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:12:11,706 INFO L225 Difference]: With dead ends: 69 [2018-12-03 15:12:11,706 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 15:12:11,708 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2015 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=13429, Invalid=21727, Unknown=0, NotChecked=0, Total=35156 [2018-12-03 15:12:11,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 15:12:11,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-12-03 15:12:11,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-12-03 15:12:11,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2018-12-03 15:12:11,714 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2018-12-03 15:12:11,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:12:11,714 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2018-12-03 15:12:11,714 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 15:12:11,714 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2018-12-03 15:12:11,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-12-03 15:12:11,715 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:12:11,715 INFO L402 BasicCegarLoop]: trace histogram [63, 1, 1, 1] [2018-12-03 15:12:11,715 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:12:11,715 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:12:11,715 INFO L82 PathProgramCache]: Analyzing trace with hash -1026988024, now seen corresponding path program 32 times [2018-12-03 15:12:11,716 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:12:11,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:11,716 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:12:11,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:11,717 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:12:11,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:14,431 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 15:12:14,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:14,432 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:12:14,432 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:12:14,432 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:12:14,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:14,432 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:12:14,441 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:12:14,442 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:12:14,498 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-12-03 15:12:14,499 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:12:14,501 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:12:14,605 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 15:12:14,605 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:12:20,203 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 15:12:20,222 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:12:20,222 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 129 [2018-12-03 15:12:20,223 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:12:20,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-12-03 15:12:20,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-12-03 15:12:20,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6180, Invalid=10590, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 15:12:20,224 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 67 states. [2018-12-03 15:12:20,408 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 8 [2018-12-03 15:12:20,581 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 9 [2018-12-03 15:12:20,761 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:12:20,940 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:12:21,127 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:12:21,319 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:12:21,523 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:12:21,701 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:12:21,884 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:12:22,066 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:12:22,248 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:12:22,437 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:12:22,618 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:12:22,795 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:12:22,985 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:12:23,170 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:12:23,365 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:12:23,735 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:12:23,931 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 15:12:30,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:12:30,420 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2018-12-03 15:12:30,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 15:12:30,420 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 66 [2018-12-03 15:12:30,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:12:30,421 INFO L225 Difference]: With dead ends: 71 [2018-12-03 15:12:30,421 INFO L226 Difference]: Without dead ends: 69 [2018-12-03 15:12:30,422 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2080 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=14244, Invalid=22812, Unknown=0, NotChecked=0, Total=37056 [2018-12-03 15:12:30,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-12-03 15:12:30,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-12-03 15:12:30,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-03 15:12:30,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-12-03 15:12:30,427 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2018-12-03 15:12:30,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:12:30,427 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-12-03 15:12:30,427 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-12-03 15:12:30,427 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-12-03 15:12:30,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-12-03 15:12:30,428 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:12:30,428 INFO L402 BasicCegarLoop]: trace histogram [65, 1, 1, 1] [2018-12-03 15:12:30,428 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:12:30,428 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:12:30,428 INFO L82 PathProgramCache]: Analyzing trace with hash 906923816, now seen corresponding path program 33 times [2018-12-03 15:12:30,428 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:12:30,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:30,429 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:12:30,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:30,429 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:12:30,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:32,922 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 15:12:32,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:32,923 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:12:32,923 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:12:32,923 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:12:32,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:32,923 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:12:32,932 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:12:32,933 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:12:33,177 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:12:33,178 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:12:33,321 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:12:33,422 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 15:12:33,422 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:12:39,659 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 15:12:39,678 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:12:39,678 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 134 [2018-12-03 15:12:39,678 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:12:39,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-12-03 15:12:39,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-12-03 15:12:39,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6575, Invalid=11515, Unknown=0, NotChecked=0, Total=18090 [2018-12-03 15:12:39,680 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 69 states. [2018-12-03 15:12:39,886 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-12-03 15:12:40,079 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-12-03 15:12:40,274 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:12:40,469 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:12:40,667 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:12:40,870 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:12:41,069 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:12:41,266 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:12:41,466 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:12:41,661 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:12:41,878 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:12:42,081 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:12:42,271 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:12:42,466 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:12:42,667 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:12:42,867 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:12:43,065 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:12:43,273 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:12:43,472 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:12:43,673 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:12:43,876 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:12:47,677 WARN L180 SmtUtils]: Spent 480.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 11 [2018-12-03 15:12:51,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:12:51,635 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-12-03 15:12:51,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 15:12:51,635 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 68 [2018-12-03 15:12:51,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:12:51,636 INFO L225 Difference]: With dead ends: 73 [2018-12-03 15:12:51,636 INFO L226 Difference]: Without dead ends: 71 [2018-12-03 15:12:51,637 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2277 ImplicationChecksByTransitivity, 20.1s TimeCoverageRelationStatistics Valid=15219, Invalid=24581, Unknown=0, NotChecked=0, Total=39800 [2018-12-03 15:12:51,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-12-03 15:12:51,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2018-12-03 15:12:51,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-12-03 15:12:51,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-12-03 15:12:51,643 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2018-12-03 15:12:51,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:12:51,643 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-12-03 15:12:51,644 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-12-03 15:12:51,644 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-12-03 15:12:51,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-12-03 15:12:51,644 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:12:51,644 INFO L402 BasicCegarLoop]: trace histogram [67, 1, 1, 1] [2018-12-03 15:12:51,645 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:12:51,645 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:12:51,645 INFO L82 PathProgramCache]: Analyzing trace with hash -324637112, now seen corresponding path program 34 times [2018-12-03 15:12:51,645 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:12:51,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:51,646 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:12:51,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:12:51,646 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:12:51,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:54,309 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 15:12:54,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:54,310 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:12:54,310 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:12:54,310 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:12:54,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:12:54,310 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:12:54,319 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:12:54,320 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:12:54,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:12:54,746 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:12:54,843 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 15:12:54,843 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:13:01,646 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 15:13:01,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:13:01,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 138 [2018-12-03 15:13:01,665 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:13:01,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 15:13:01,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 15:13:01,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6978, Invalid=12204, Unknown=0, NotChecked=0, Total=19182 [2018-12-03 15:13:01,666 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 71 states. [2018-12-03 15:13:01,869 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-12-03 15:13:02,065 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 9 [2018-12-03 15:13:02,289 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:13:02,499 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:13:02,697 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:13:02,890 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:13:03,083 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:13:03,298 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:13:03,503 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:13:03,710 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:13:03,915 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:13:04,123 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:13:04,324 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:13:04,518 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:13:04,724 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:13:04,934 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:13:05,142 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:13:05,348 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:13:05,554 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:13:05,759 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:13:05,972 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:13:06,179 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:13:07,420 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 11 [2018-12-03 15:13:13,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:13:13,648 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2018-12-03 15:13:13,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 15:13:13,649 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 70 [2018-12-03 15:13:13,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:13:13,650 INFO L225 Difference]: With dead ends: 75 [2018-12-03 15:13:13,650 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 15:13:13,652 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2414 ImplicationChecksByTransitivity, 20.9s TimeCoverageRelationStatistics Valid=16156, Invalid=26074, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 15:13:13,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 15:13:13,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2018-12-03 15:13:13,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 15:13:13,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2018-12-03 15:13:13,657 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2018-12-03 15:13:13,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:13:13,658 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2018-12-03 15:13:13,658 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 15:13:13,658 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2018-12-03 15:13:13,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 15:13:13,658 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:13:13,658 INFO L402 BasicCegarLoop]: trace histogram [69, 1, 1, 1] [2018-12-03 15:13:13,659 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:13:13,659 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:13:13,659 INFO L82 PathProgramCache]: Analyzing trace with hash 1556284776, now seen corresponding path program 35 times [2018-12-03 15:13:13,659 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:13:13,660 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:13:13,660 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:13:13,660 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:13:13,660 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:13:13,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:13:16,208 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 15:13:16,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:13:16,208 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:13:16,209 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:13:16,209 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:13:16,209 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:13:16,209 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:13:16,217 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:13:16,217 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:13:16,264 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-12-03 15:13:16,264 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:13:16,267 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:13:16,365 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 15:13:16,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:13:23,316 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 15:13:23,337 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:13:23,337 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 141 [2018-12-03 15:13:23,337 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:13:23,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-12-03 15:13:23,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-12-03 15:13:23,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7389, Invalid=12633, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 15:13:23,338 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 73 states. [2018-12-03 15:13:23,543 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 8 [2018-12-03 15:13:23,744 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 9 [2018-12-03 15:13:23,949 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:13:24,150 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:13:24,357 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:13:24,555 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:13:24,758 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:13:24,963 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:13:25,178 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:13:25,390 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:13:25,604 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:13:25,817 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:13:26,019 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:13:26,226 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:13:26,444 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:13:26,666 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:13:26,882 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:13:27,096 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:13:27,311 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:13:27,526 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:13:27,762 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:13:27,988 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:13:28,202 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:13:28,414 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:13:28,840 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 15:13:36,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:13:36,087 INFO L93 Difference]: Finished difference Result 77 states and 78 transitions. [2018-12-03 15:13:36,088 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 15:13:36,088 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 72 [2018-12-03 15:13:36,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:13:36,089 INFO L225 Difference]: With dead ends: 77 [2018-12-03 15:13:36,089 INFO L226 Difference]: Without dead ends: 75 [2018-12-03 15:13:36,090 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2485 ImplicationChecksByTransitivity, 21.7s TimeCoverageRelationStatistics Valid=17049, Invalid=27261, Unknown=0, NotChecked=0, Total=44310 [2018-12-03 15:13:36,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-03 15:13:36,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-12-03 15:13:36,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-03 15:13:36,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-12-03 15:13:36,096 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2018-12-03 15:13:36,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:13:36,096 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-12-03 15:13:36,096 INFO L481 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-12-03 15:13:36,097 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-12-03 15:13:36,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-12-03 15:13:36,097 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:13:36,097 INFO L402 BasicCegarLoop]: trace histogram [71, 1, 1, 1] [2018-12-03 15:13:36,097 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:13:36,098 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:13:36,098 INFO L82 PathProgramCache]: Analyzing trace with hash 940987528, now seen corresponding path program 36 times [2018-12-03 15:13:36,098 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:13:36,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:13:36,098 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:13:36,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:13:36,099 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:13:36,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:13:39,158 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 15:13:39,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:13:39,158 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:13:39,158 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:13:39,159 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:13:39,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:13:39,159 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:13:39,169 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:13:39,169 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:13:39,485 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:13:39,486 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:13:39,666 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:13:39,843 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 15:13:39,843 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:13:47,028 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 15:13:47,047 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:13:47,047 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 146 [2018-12-03 15:13:47,047 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:13:47,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-03 15:13:47,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-03 15:13:47,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7820, Invalid=13642, Unknown=0, NotChecked=0, Total=21462 [2018-12-03 15:13:47,048 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 75 states. [2018-12-03 15:13:47,298 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-12-03 15:13:47,495 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-12-03 15:13:47,704 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:13:47,914 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:13:48,128 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:13:48,353 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:13:48,572 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:13:48,790 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:13:49,026 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:13:49,245 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:13:49,468 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:13:49,692 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:13:49,917 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:13:50,133 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:13:50,364 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:13:50,594 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:13:50,819 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:13:51,055 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:13:51,277 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:13:51,514 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:13:51,747 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:13:51,974 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:13:52,202 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:13:52,430 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:13:52,653 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:13:52,886 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:13:53,338 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 15:14:01,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:14:01,118 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-12-03 15:14:01,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 15:14:01,118 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 74 [2018-12-03 15:14:01,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:14:01,119 INFO L225 Difference]: With dead ends: 79 [2018-12-03 15:14:01,119 INFO L226 Difference]: Without dead ends: 77 [2018-12-03 15:14:01,121 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2700 ImplicationChecksByTransitivity, 23.6s TimeCoverageRelationStatistics Valid=18114, Invalid=29192, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 15:14:01,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-12-03 15:14:01,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-12-03 15:14:01,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-12-03 15:14:01,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-12-03 15:14:01,127 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2018-12-03 15:14:01,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:14:01,127 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-12-03 15:14:01,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-03 15:14:01,127 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-12-03 15:14:01,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-12-03 15:14:01,128 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:14:01,128 INFO L402 BasicCegarLoop]: trace histogram [73, 1, 1, 1] [2018-12-03 15:14:01,128 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:14:01,128 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:14:01,129 INFO L82 PathProgramCache]: Analyzing trace with hash -1949148248, now seen corresponding path program 37 times [2018-12-03 15:14:01,129 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:14:01,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:14:01,129 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:14:01,130 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:14:01,132 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:14:01,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:14:04,331 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 15:14:04,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:14:04,331 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:14:04,331 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:14:04,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:14:04,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:14:04,332 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:14:04,350 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:14:04,350 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:14:04,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:14:04,912 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:14:05,041 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 15:14:05,041 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:14:12,832 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 15:14:12,851 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:14:12,851 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 150 [2018-12-03 15:14:12,851 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:14:12,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 15:14:12,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 15:14:12,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8259, Invalid=14391, Unknown=0, NotChecked=0, Total=22650 [2018-12-03 15:14:12,853 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 77 states. [2018-12-03 15:14:13,081 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2018-12-03 15:14:13,298 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 9 [2018-12-03 15:14:13,517 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:14:13,759 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:14:14,006 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:14:14,228 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:14:14,443 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:14:14,662 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:14:14,890 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:14:15,132 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:14:15,364 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:14:15,597 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:14:15,829 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:14:16,059 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:14:16,295 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:14:16,532 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:14:16,787 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:14:17,027 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:14:17,273 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:14:17,519 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:14:17,757 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:14:17,991 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:14:18,227 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:14:18,465 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:14:18,706 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:14:18,958 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:14:19,225 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:14:19,457 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:14:27,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:14:27,616 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2018-12-03 15:14:27,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 15:14:27,617 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 76 [2018-12-03 15:14:27,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:14:27,617 INFO L225 Difference]: With dead ends: 81 [2018-12-03 15:14:27,617 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 15:14:27,619 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2849 ImplicationChecksByTransitivity, 25.0s TimeCoverageRelationStatistics Valid=19135, Invalid=30817, Unknown=0, NotChecked=0, Total=49952 [2018-12-03 15:14:27,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 15:14:27,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-12-03 15:14:27,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-12-03 15:14:27,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-12-03 15:14:27,623 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2018-12-03 15:14:27,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:14:27,623 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-12-03 15:14:27,623 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 15:14:27,623 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-12-03 15:14:27,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-12-03 15:14:27,624 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:14:27,624 INFO L402 BasicCegarLoop]: trace histogram [75, 1, 1, 1] [2018-12-03 15:14:27,624 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:14:27,624 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:14:27,624 INFO L82 PathProgramCache]: Analyzing trace with hash -525788472, now seen corresponding path program 38 times [2018-12-03 15:14:27,625 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:14:27,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:14:27,625 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:14:27,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:14:27,626 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:14:28,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:14:30,949 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 15:14:30,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:14:30,950 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:14:30,950 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:14:30,950 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:14:30,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:14:30,951 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:14:30,968 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:14:30,968 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:14:31,095 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-12-03 15:14:31,095 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:14:31,099 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:14:31,212 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 15:14:31,212 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:14:39,221 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 15:14:39,240 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:14:39,240 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 153 [2018-12-03 15:14:39,240 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:14:39,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-12-03 15:14:39,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-12-03 15:14:39,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8706, Invalid=14856, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 15:14:39,241 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 79 states. [2018-12-03 15:14:39,487 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 8 [2018-12-03 15:14:39,737 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 9 [2018-12-03 15:14:39,967 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:14:40,197 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:14:40,439 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:14:40,663 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:14:40,894 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:14:41,124 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:14:41,388 WARN L180 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:14:41,630 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:14:41,870 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:14:42,108 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:14:42,350 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:14:42,575 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:14:42,823 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:14:43,070 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:14:43,313 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:14:43,560 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:14:43,810 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:14:44,057 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:14:44,325 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:14:44,591 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:14:44,850 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:14:45,096 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:14:45,340 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:14:45,586 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:14:45,830 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:14:46,079 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:14:46,326 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:14:55,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:14:55,254 INFO L93 Difference]: Finished difference Result 83 states and 84 transitions. [2018-12-03 15:14:55,254 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-12-03 15:14:55,255 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 78 [2018-12-03 15:14:55,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:14:55,256 INFO L225 Difference]: With dead ends: 83 [2018-12-03 15:14:55,256 INFO L226 Difference]: Without dead ends: 81 [2018-12-03 15:14:55,258 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2926 ImplicationChecksByTransitivity, 26.6s TimeCoverageRelationStatistics Valid=20106, Invalid=32106, Unknown=0, NotChecked=0, Total=52212 [2018-12-03 15:14:55,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-12-03 15:14:55,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-12-03 15:14:55,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-03 15:14:55,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-12-03 15:14:55,263 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2018-12-03 15:14:55,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:14:55,263 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-12-03 15:14:55,263 INFO L481 AbstractCegarLoop]: Interpolant automaton has 79 states. [2018-12-03 15:14:55,263 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-12-03 15:14:55,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-12-03 15:14:55,263 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:14:55,264 INFO L402 BasicCegarLoop]: trace histogram [77, 1, 1, 1] [2018-12-03 15:14:55,264 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:14:55,264 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:14:55,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1523356136, now seen corresponding path program 39 times [2018-12-03 15:14:55,264 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:14:55,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:14:55,265 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:14:55,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:14:55,265 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:14:55,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:14:58,913 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 15:14:58,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:14:58,913 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:14:58,913 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:14:58,913 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:14:58,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:14:58,913 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:14:58,922 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:14:58,922 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:14:59,333 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:14:59,333 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:14:59,563 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:14:59,677 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 15:14:59,677 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:15:08,314 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 15:15:08,333 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:15:08,333 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 158 [2018-12-03 15:15:08,333 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:15:08,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-12-03 15:15:08,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-12-03 15:15:08,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9173, Invalid=15949, Unknown=0, NotChecked=0, Total=25122 [2018-12-03 15:15:08,334 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 81 states. [2018-12-03 15:15:08,582 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 8 [2018-12-03 15:15:08,814 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 9 [2018-12-03 15:15:09,059 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:15:09,300 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:15:09,537 WARN L180 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:15:09,781 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:15:10,040 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:15:10,298 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:15:10,556 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:15:10,807 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:15:11,062 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:15:11,319 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:15:11,576 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:15:11,818 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:15:12,086 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:15:12,351 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:15:12,613 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:15:12,876 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:15:13,139 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:15:13,406 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:15:13,674 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:15:13,940 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:15:14,197 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:15:14,451 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:15:14,703 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:15:14,958 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:15:15,225 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:15:15,502 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:15:15,765 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:15:16,011 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:15:16,260 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:15:16,512 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:15:25,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:15:25,056 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2018-12-03 15:15:25,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 15:15:25,057 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 80 [2018-12-03 15:15:25,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:15:25,058 INFO L225 Difference]: With dead ends: 85 [2018-12-03 15:15:25,058 INFO L226 Difference]: Without dead ends: 83 [2018-12-03 15:15:25,060 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3159 ImplicationChecksByTransitivity, 28.2s TimeCoverageRelationStatistics Valid=21261, Invalid=34199, Unknown=0, NotChecked=0, Total=55460 [2018-12-03 15:15:25,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-12-03 15:15:25,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2018-12-03 15:15:25,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-12-03 15:15:25,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-12-03 15:15:25,065 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2018-12-03 15:15:25,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:15:25,065 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-12-03 15:15:25,065 INFO L481 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-12-03 15:15:25,065 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-12-03 15:15:25,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-12-03 15:15:25,065 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:15:25,065 INFO L402 BasicCegarLoop]: trace histogram [79, 1, 1, 1] [2018-12-03 15:15:25,066 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:15:25,066 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:15:25,066 INFO L82 PathProgramCache]: Analyzing trace with hash -638664440, now seen corresponding path program 40 times [2018-12-03 15:15:25,066 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:15:25,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:15:25,067 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:15:25,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:15:25,067 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:15:25,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:15:28,780 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 15:15:28,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:15:28,780 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:15:28,780 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:15:28,780 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:15:28,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:15:28,781 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:15:28,789 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:15:28,789 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:15:29,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:15:29,453 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:15:29,577 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 15:15:29,578 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:15:38,766 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 15:15:38,786 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:15:38,786 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 162 [2018-12-03 15:15:38,786 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:15:38,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 15:15:38,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 15:15:38,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9648, Invalid=16758, Unknown=0, NotChecked=0, Total=26406 [2018-12-03 15:15:38,788 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 83 states. [2018-12-03 15:15:39,048 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 8 [2018-12-03 15:15:39,285 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 9 [2018-12-03 15:15:39,534 WARN L180 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:15:39,786 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:15:40,067 WARN L180 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:15:40,307 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:15:40,554 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:15:40,811 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:15:41,105 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:15:41,365 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:15:41,617 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:15:41,879 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:15:42,142 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:15:42,393 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:15:42,663 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:15:42,931 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:15:43,204 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:15:43,476 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:15:43,745 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:15:44,023 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:15:44,319 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:15:44,588 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:15:44,877 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:15:45,161 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:15:45,428 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:15:45,700 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:15:45,982 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:15:46,281 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:15:46,546 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:15:46,803 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:15:47,087 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:15:47,346 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:15:47,603 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:15:47,862 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:15:56,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:15:56,859 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2018-12-03 15:15:56,859 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 15:15:56,860 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 82 [2018-12-03 15:15:56,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:15:56,861 INFO L225 Difference]: With dead ends: 87 [2018-12-03 15:15:56,861 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 15:15:56,863 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3320 ImplicationChecksByTransitivity, 30.2s TimeCoverageRelationStatistics Valid=22366, Invalid=35956, Unknown=0, NotChecked=0, Total=58322 [2018-12-03 15:15:56,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 15:15:56,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2018-12-03 15:15:56,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-12-03 15:15:56,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2018-12-03 15:15:56,868 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2018-12-03 15:15:56,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:15:56,868 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2018-12-03 15:15:56,868 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 15:15:56,868 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2018-12-03 15:15:56,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-12-03 15:15:56,868 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:15:56,869 INFO L402 BasicCegarLoop]: trace histogram [81, 1, 1, 1] [2018-12-03 15:15:56,869 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:15:56,869 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:15:56,869 INFO L82 PathProgramCache]: Analyzing trace with hash 423733288, now seen corresponding path program 41 times [2018-12-03 15:15:56,869 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:15:56,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:15:56,870 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:15:56,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:15:56,870 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:15:57,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:16:00,437 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 15:16:00,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:16:00,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:16:00,437 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:16:00,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:16:00,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:16:00,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:16:00,446 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:16:00,446 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:16:00,504 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-12-03 15:16:00,504 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:16:00,508 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:16:00,626 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 15:16:00,626 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:16:10,257 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 15:16:10,276 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:16:10,276 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 165 [2018-12-03 15:16:10,277 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:16:10,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-12-03 15:16:10,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-12-03 15:16:10,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10131, Invalid=17259, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 15:16:10,278 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 85 states. [2018-12-03 15:16:10,547 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 8 [2018-12-03 15:16:10,792 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 9 [2018-12-03 15:16:11,057 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:16:11,317 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:16:11,587 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:16:11,865 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:16:12,121 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:16:12,376 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:16:12,638 WARN L180 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:16:12,920 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:16:13,181 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:16:13,454 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:16:13,714 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:16:13,972 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:16:14,250 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:16:14,521 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:16:14,803 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:16:15,082 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:16:15,360 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:16:15,643 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:16:15,926 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:16:16,198 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:16:16,478 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:16:16,796 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:16:17,113 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:16:17,403 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:16:17,689 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:16:17,969 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:16:18,257 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:16:18,532 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:16:18,812 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:16:19,096 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:16:19,373 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:16:19,642 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:16:19,903 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:16:20,174 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:16:29,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:16:29,473 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2018-12-03 15:16:29,473 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-12-03 15:16:29,473 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 84 [2018-12-03 15:16:29,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:16:29,474 INFO L225 Difference]: With dead ends: 89 [2018-12-03 15:16:29,474 INFO L226 Difference]: Without dead ends: 87 [2018-12-03 15:16:29,476 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3403 ImplicationChecksByTransitivity, 31.5s TimeCoverageRelationStatistics Valid=23415, Invalid=37347, Unknown=0, NotChecked=0, Total=60762 [2018-12-03 15:16:29,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-12-03 15:16:29,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-12-03 15:16:29,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 15:16:29,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-12-03 15:16:29,483 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2018-12-03 15:16:29,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:16:29,483 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-12-03 15:16:29,484 INFO L481 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-12-03 15:16:29,484 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-12-03 15:16:29,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 15:16:29,484 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:16:29,484 INFO L402 BasicCegarLoop]: trace histogram [83, 1, 1, 1] [2018-12-03 15:16:29,485 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:16:29,485 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:16:29,485 INFO L82 PathProgramCache]: Analyzing trace with hash -814266552, now seen corresponding path program 42 times [2018-12-03 15:16:29,485 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:16:29,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:16:29,486 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:16:29,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:16:29,486 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:16:30,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:16:33,709 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 15:16:33,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:16:33,709 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:16:33,709 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:16:33,710 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:16:33,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:16:33,710 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:16:33,722 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:16:33,722 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:16:34,212 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:16:34,212 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:16:34,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:16:34,622 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 15:16:34,623 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:16:44,788 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 15:16:44,807 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:16:44,807 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 170 [2018-12-03 15:16:44,807 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:16:44,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-12-03 15:16:44,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-12-03 15:16:44,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10634, Invalid=18436, Unknown=0, NotChecked=0, Total=29070 [2018-12-03 15:16:44,809 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 87 states. [2018-12-03 15:16:45,092 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 8 [2018-12-03 15:16:45,367 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 9 [2018-12-03 15:16:45,640 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:16:45,909 WARN L180 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:16:46,185 WARN L180 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:16:46,456 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:16:46,732 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:16:47,002 WARN L180 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:16:47,284 WARN L180 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:16:47,605 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:16:47,892 WARN L180 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:16:48,178 WARN L180 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:16:48,451 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:16:48,735 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:16:49,020 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:16:49,310 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:16:49,603 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:16:49,898 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:16:50,192 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:16:50,482 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:16:50,785 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:16:51,080 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:16:51,377 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:16:51,672 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:16:51,966 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:16:52,266 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:16:52,582 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:16:52,907 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:16:53,200 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:16:53,496 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:16:53,784 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:16:54,073 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:16:54,354 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:16:54,636 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:16:54,922 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:16:55,194 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:16:55,467 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:16:55,744 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:16:56,034 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:16:57,655 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 11 [2018-12-03 15:17:05,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:17:05,241 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2018-12-03 15:17:05,241 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 15:17:05,241 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 86 [2018-12-03 15:17:05,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:17:05,242 INFO L225 Difference]: With dead ends: 91 [2018-12-03 15:17:05,242 INFO L226 Difference]: Without dead ends: 89 [2018-12-03 15:17:05,244 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3654 ImplicationChecksByTransitivity, 33.7s TimeCoverageRelationStatistics Valid=24660, Invalid=39602, Unknown=0, NotChecked=0, Total=64262 [2018-12-03 15:17:05,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-12-03 15:17:05,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-12-03 15:17:05,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-12-03 15:17:05,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-12-03 15:17:05,249 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2018-12-03 15:17:05,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:17:05,250 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-12-03 15:17:05,250 INFO L481 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-12-03 15:17:05,250 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-12-03 15:17:05,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-12-03 15:17:05,250 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:17:05,250 INFO L402 BasicCegarLoop]: trace histogram [85, 1, 1, 1] [2018-12-03 15:17:05,250 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:17:05,251 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:17:05,251 INFO L82 PathProgramCache]: Analyzing trace with hash -826171800, now seen corresponding path program 43 times [2018-12-03 15:17:05,251 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:17:05,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:17:05,252 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:17:05,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:17:05,252 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:17:05,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:17:09,472 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 15:17:09,473 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:17:09,473 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:17:09,473 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:17:09,473 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:17:09,473 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:17:09,473 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:17:09,481 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:17:09,482 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:17:09,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:17:10,300 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:17:10,437 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 15:17:10,438 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:17:21,052 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 15:17:21,071 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:17:21,071 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 174 [2018-12-03 15:17:21,071 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:17:21,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 15:17:21,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 15:17:21,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11145, Invalid=19305, Unknown=0, NotChecked=0, Total=30450 [2018-12-03 15:17:21,073 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 89 states. [2018-12-03 15:17:21,365 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 8 [2018-12-03 15:17:21,626 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 9 [2018-12-03 15:17:21,907 WARN L180 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 15:17:22,192 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 15:17:22,479 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:17:22,752 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:17:23,030 WARN L180 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:17:23,345 WARN L180 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:17:23,651 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:17:23,941 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:17:24,232 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:17:24,522 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:17:24,819 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:17:25,107 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:17:25,424 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:17:25,725 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:17:26,024 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:17:26,327 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:17:26,627 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:17:26,942 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:17:27,260 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:17:27,571 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:17:27,889 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:17:28,196 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:17:28,516 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:17:28,845 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:17:29,153 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:17:29,468 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:17:29,770 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:17:30,079 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:17:30,397 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:17:30,708 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:17:31,006 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:17:31,300 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:17:31,594 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:17:31,881 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:17:32,172 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:17:32,457 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:17:32,741 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:17:33,600 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 15:17:42,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:17:42,580 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2018-12-03 15:17:42,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 15:17:42,581 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 88 [2018-12-03 15:17:42,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:17:42,582 INFO L225 Difference]: With dead ends: 93 [2018-12-03 15:17:42,582 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 15:17:42,583 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 258 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3827 ImplicationChecksByTransitivity, 35.5s TimeCoverageRelationStatistics Valid=25849, Invalid=41491, Unknown=0, NotChecked=0, Total=67340 [2018-12-03 15:17:42,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 15:17:42,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-12-03 15:17:42,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-12-03 15:17:42,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2018-12-03 15:17:42,588 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2018-12-03 15:17:42,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:17:42,588 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2018-12-03 15:17:42,588 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 15:17:42,588 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2018-12-03 15:17:42,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-12-03 15:17:42,589 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:17:42,589 INFO L402 BasicCegarLoop]: trace histogram [87, 1, 1, 1] [2018-12-03 15:17:42,589 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:17:42,589 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:17:42,589 INFO L82 PathProgramCache]: Analyzing trace with hash 617786760, now seen corresponding path program 44 times [2018-12-03 15:17:42,589 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:17:42,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:17:42,590 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:17:42,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:17:42,590 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:17:43,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:17:46,872 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 15:17:46,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:17:46,872 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:17:46,873 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:17:46,873 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:17:46,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:17:46,873 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:17:46,883 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:17:46,883 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:17:46,942 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-12-03 15:17:46,942 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:17:46,946 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:17:47,064 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 15:17:47,064 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:17:57,815 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 15:17:57,834 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:17:57,834 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 177 [2018-12-03 15:17:57,834 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:17:57,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-12-03 15:17:57,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-12-03 15:17:57,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11664, Invalid=19842, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 15:17:57,836 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 91 states. [2018-12-03 15:17:58,133 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 8 [2018-12-03 15:17:58,412 WARN L180 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 9 [2018-12-03 15:17:58,700 WARN L180 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 15:17:58,991 WARN L180 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 15:17:59,302 WARN L180 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 15:17:59,592 WARN L180 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 15:17:59,875 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:18:00,175 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:18:00,482 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:18:00,774 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:18:01,090 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:18:01,392 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:18:01,688 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:18:01,992 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:18:02,311 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:18:02,628 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:18:02,945 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:18:03,276 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:18:03,588 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:18:03,910 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:18:04,239 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:18:04,566 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:18:04,882 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:18:05,205 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:18:05,534 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:18:05,869 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:18:06,197 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:18:06,522 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:18:06,843 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:18:07,170 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:18:07,492 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:18:07,809 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:18:08,130 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:18:08,455 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:18:08,762 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:18:09,063 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:18:09,420 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:18:09,715 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:18:10,009 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:18:10,305 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:18:10,879 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:18:20,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:18:20,791 INFO L93 Difference]: Finished difference Result 95 states and 96 transitions. [2018-12-03 15:18:20,791 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 15:18:20,792 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 90 [2018-12-03 15:18:20,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:18:20,793 INFO L225 Difference]: With dead ends: 95 [2018-12-03 15:18:20,793 INFO L226 Difference]: Without dead ends: 93 [2018-12-03 15:18:20,795 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3916 ImplicationChecksByTransitivity, 37.0s TimeCoverageRelationStatistics Valid=26976, Invalid=42984, Unknown=0, NotChecked=0, Total=69960 [2018-12-03 15:18:20,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-12-03 15:18:20,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-12-03 15:18:20,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-03 15:18:20,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-12-03 15:18:20,802 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2018-12-03 15:18:20,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:18:20,802 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-12-03 15:18:20,802 INFO L481 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-12-03 15:18:20,802 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-12-03 15:18:20,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-12-03 15:18:20,803 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:18:20,803 INFO L402 BasicCegarLoop]: trace histogram [89, 1, 1, 1] [2018-12-03 15:18:20,803 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:18:20,803 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:18:20,803 INFO L82 PathProgramCache]: Analyzing trace with hash 987526312, now seen corresponding path program 45 times [2018-12-03 15:18:20,804 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:18:20,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:18:20,805 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:18:20,805 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:18:20,805 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:18:21,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:18:25,385 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 15:18:25,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:18:25,386 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:18:25,386 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:18:25,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:18:25,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:18:25,386 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:18:25,396 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:18:25,396 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:18:25,973 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:18:25,973 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:18:26,325 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:18:26,463 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 15:18:26,464 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:18:37,931 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 15:18:37,951 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:18:37,951 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 182 [2018-12-03 15:18:37,951 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:18:37,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-12-03 15:18:37,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-12-03 15:18:37,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12203, Invalid=21103, Unknown=0, NotChecked=0, Total=33306 [2018-12-03 15:18:37,953 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 93 states. [2018-12-03 15:18:38,268 WARN L180 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 8 [2018-12-03 15:18:38,561 WARN L180 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 9 [2018-12-03 15:18:38,872 WARN L180 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 15:18:39,204 WARN L180 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 15:18:39,510 WARN L180 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 15:18:39,816 WARN L180 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 15:18:40,134 WARN L180 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 15:18:40,468 WARN L180 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 15:18:40,784 WARN L180 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:18:41,105 WARN L180 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:18:41,432 WARN L180 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:18:41,758 WARN L180 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:18:42,078 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:18:42,394 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:18:42,710 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:18:43,032 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:18:43,353 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:18:43,679 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:18:44,049 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:18:44,385 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:18:44,715 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:18:45,033 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:18:45,386 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:18:45,728 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:18:46,062 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:18:46,393 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:18:46,730 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:18:47,057 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:18:47,401 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:18:47,732 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:18:48,063 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:18:48,391 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:18:48,713 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:18:49,036 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:18:49,349 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:18:49,677 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:18:49,997 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:18:50,320 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:18:50,655 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:18:50,958 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:18:51,256 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:18:51,558 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:18:51,866 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:19:02,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:19:02,597 INFO L93 Difference]: Finished difference Result 97 states and 98 transitions. [2018-12-03 15:19:02,598 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 15:19:02,598 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 92 [2018-12-03 15:19:02,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:19:02,599 INFO L225 Difference]: With dead ends: 97 [2018-12-03 15:19:02,599 INFO L226 Difference]: Without dead ends: 95 [2018-12-03 15:19:02,601 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 15:19:02,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-12-03 15:19:02,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2018-12-03 15:19:02,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-12-03 15:19:02,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-12-03 15:19:02,607 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2018-12-03 15:19:02,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:19:02,607 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-12-03 15:19:02,607 INFO L481 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-12-03 15:19:02,607 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-12-03 15:19:02,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-12-03 15:19:02,608 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:19:02,608 INFO L402 BasicCegarLoop]: trace histogram [91, 1, 1, 1] [2018-12-03 15:19:02,608 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:19:02,608 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:19:02,608 INFO L82 PathProgramCache]: Analyzing trace with hash -175049784, now seen corresponding path program 46 times [2018-12-03 15:19:02,608 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:19:02,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:19:02,609 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:19:02,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:19:02,609 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:19:03,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:19:07,481 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 15:19:07,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:19:07,481 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:19:07,482 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:19:07,482 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:19:07,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:19:07,482 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:19:07,490 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:19:07,490 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:19:08,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:19:08,486 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:19:08,704 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 15:19:08,704 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:19:20,711 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 15:19:20,730 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:19:20,730 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 186 [2018-12-03 15:19:20,730 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:19:20,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 15:19:20,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 15:19:20,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12750, Invalid=22032, Unknown=0, NotChecked=0, Total=34782 [2018-12-03 15:19:20,732 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 95 states. [2018-12-03 15:19:21,061 WARN L180 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 8 [2018-12-03 15:19:21,378 WARN L180 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 9 [2018-12-03 15:19:21,697 WARN L180 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 15:19:22,049 WARN L180 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 15:19:22,363 WARN L180 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 15:19:22,690 WARN L180 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 15:19:22,998 WARN L180 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 15:19:23,315 WARN L180 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 15:19:23,632 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 15:19:23,950 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 15:19:24,280 WARN L180 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:19:24,610 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:19:24,947 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:19:25,269 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:19:25,598 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:19:25,937 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:19:26,292 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:19:26,680 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:19:27,022 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:19:27,372 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:19:27,737 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:19:28,082 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:19:28,438 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:19:28,805 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:19:29,157 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:19:29,512 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:19:29,872 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:19:30,261 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:19:30,612 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:19:30,969 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:19:31,323 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:19:31,692 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:19:32,034 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:19:32,387 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:19:32,725 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:19:33,068 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:19:33,411 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:19:33,748 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:19:34,090 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:19:34,404 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:19:34,713 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:19:35,033 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:19:35,340 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:19:35,649 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:19:35,957 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:19:36,267 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:19:36,597 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:19:37,561 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-12-03 15:19:47,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:19:47,084 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-12-03 15:19:47,084 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 15:19:47,085 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 94 [2018-12-03 15:19:47,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:19:47,086 INFO L225 Difference]: With dead ends: 99 [2018-12-03 15:19:47,086 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 15:19:47,087 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 276 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4370 ImplicationChecksByTransitivity, 42.2s TimeCoverageRelationStatistics Valid=29584, Invalid=47422, Unknown=0, NotChecked=0, Total=77006 [2018-12-03 15:19:47,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 15:19:47,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-12-03 15:19:47,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-12-03 15:19:47,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-12-03 15:19:47,092 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2018-12-03 15:19:47,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:19:47,093 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-12-03 15:19:47,093 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 15:19:47,093 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-12-03 15:19:47,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-12-03 15:19:47,093 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:19:47,093 INFO L402 BasicCegarLoop]: trace histogram [93, 1, 1, 1] [2018-12-03 15:19:47,093 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:19:47,094 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:19:47,094 INFO L82 PathProgramCache]: Analyzing trace with hash -719181080, now seen corresponding path program 47 times [2018-12-03 15:19:47,094 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:19:47,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:19:47,094 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:19:47,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:19:47,095 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:19:47,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:19:52,473 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 15:19:52,474 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:19:52,474 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:19:52,474 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:19:52,474 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:19:52,474 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:19:52,474 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:19:52,482 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:19:52,483 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:19:52,556 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-12-03 15:19:52,556 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:19:52,560 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:19:52,695 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 15:19:52,695 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:20:04,886 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 15:20:04,917 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:20:04,918 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 189 [2018-12-03 15:20:04,918 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:20:04,918 INFO L459 AbstractCegarLoop]: Interpolant automaton has 97 states [2018-12-03 15:20:04,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2018-12-03 15:20:04,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13305, Invalid=22605, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 15:20:04,920 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 97 states. [2018-12-03 15:20:05,246 WARN L180 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 8 [2018-12-03 15:20:05,557 WARN L180 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 9 [2018-12-03 15:20:05,881 WARN L180 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 15:20:06,206 WARN L180 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 15:20:06,539 WARN L180 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 15:20:06,872 WARN L180 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 15:20:07,202 WARN L180 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 15:20:07,536 WARN L180 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 15:20:07,869 WARN L180 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 15:20:08,202 WARN L180 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 15:20:08,542 WARN L180 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 15:20:08,931 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 15:20:09,267 WARN L180 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:20:09,592 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:20:09,949 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:20:10,303 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:20:10,657 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:20:11,019 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:20:11,384 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:20:11,755 WARN L180 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:20:12,115 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:20:12,485 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:20:12,852 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:20:13,230 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:20:13,592 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:20:13,968 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:20:14,332 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:20:14,694 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:20:15,060 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:20:15,440 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:20:15,788 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:20:16,136 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:20:16,493 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:20:16,849 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:20:17,202 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:20:17,605 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:20:17,946 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:20:18,310 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:20:18,656 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:20:18,983 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:20:19,306 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:20:19,631 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:20:19,958 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:20:20,273 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:20:20,586 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:20:20,929 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:20:21,248 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:20:21,576 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:20:21,903 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:20:22,569 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 15:20:32,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:20:32,378 INFO L93 Difference]: Finished difference Result 101 states and 102 transitions. [2018-12-03 15:20:32,378 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-12-03 15:20:32,378 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 96 [2018-12-03 15:20:32,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:20:32,379 INFO L225 Difference]: With dead ends: 101 [2018-12-03 15:20:32,379 INFO L226 Difference]: Without dead ends: 99 [2018-12-03 15:20:32,382 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 281 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4465 ImplicationChecksByTransitivity, 43.9s TimeCoverageRelationStatistics Valid=30789, Invalid=49017, Unknown=0, NotChecked=0, Total=79806 [2018-12-03 15:20:32,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-12-03 15:20:32,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-12-03 15:20:32,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-12-03 15:20:32,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-12-03 15:20:32,387 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2018-12-03 15:20:32,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:20:32,388 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-12-03 15:20:32,388 INFO L481 AbstractCegarLoop]: Interpolant automaton has 97 states. [2018-12-03 15:20:32,388 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-12-03 15:20:32,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-12-03 15:20:32,388 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:20:32,388 INFO L402 BasicCegarLoop]: trace histogram [95, 1, 1, 1] [2018-12-03 15:20:32,389 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:20:32,389 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:20:32,389 INFO L82 PathProgramCache]: Analyzing trace with hash 356653576, now seen corresponding path program 48 times [2018-12-03 15:20:32,389 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:20:32,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:20:32,389 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:20:32,390 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:20:32,390 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:20:33,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:20:37,321 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 15:20:37,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:20:37,321 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:20:37,321 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:20:37,321 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:20:37,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:20:37,321 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:20:37,331 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:20:37,331 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:20:38,035 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:20:38,036 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:20:38,466 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:20:38,681 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 15:20:38,681 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:20:51,588 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 15:20:51,607 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:20:51,607 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 194 [2018-12-03 15:20:51,607 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:20:51,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-12-03 15:20:51,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-12-03 15:20:51,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13880, Invalid=23950, Unknown=0, NotChecked=0, Total=37830 [2018-12-03 15:20:51,609 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 99 states. [2018-12-03 15:20:51,951 WARN L180 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 8 [2018-12-03 15:20:52,281 WARN L180 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 9 [2018-12-03 15:20:52,607 WARN L180 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 15:20:52,936 WARN L180 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 15:20:53,296 WARN L180 SmtUtils]: Spent 315.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 15:20:53,645 WARN L180 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 15:20:53,978 WARN L180 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 15:20:54,315 WARN L180 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 15:20:54,668 WARN L180 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 15:20:55,010 WARN L180 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 15:20:55,350 WARN L180 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 15:20:55,702 WARN L180 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 15:20:56,046 WARN L180 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 15:20:56,396 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 15:20:56,755 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:20:57,117 WARN L180 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:20:57,482 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:20:57,853 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:20:58,219 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:20:58,628 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:20:58,999 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:20:59,384 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:20:59,754 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:21:00,130 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:21:00,517 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:21:00,899 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:21:01,283 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:21:01,654 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:21:02,022 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:21:02,400 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:21:02,784 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:21:03,152 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:21:03,530 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:21:03,896 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:21:04,260 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:21:04,622 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:21:04,988 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:21:05,353 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:21:05,706 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:21:06,047 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:21:06,413 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:21:06,752 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:21:07,085 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:21:07,434 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:21:07,767 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:21:08,103 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:21:08,442 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:21:08,799 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:21:09,139 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:21:09,472 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:21:10,155 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 15:21:20,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:21:20,562 INFO L93 Difference]: Finished difference Result 103 states and 104 transitions. [2018-12-03 15:21:20,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 15:21:20,562 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 98 [2018-12-03 15:21:20,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:21:20,563 INFO L225 Difference]: With dead ends: 103 [2018-12-03 15:21:20,563 INFO L226 Difference]: Without dead ends: 101 [2018-12-03 15:21:20,566 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 288 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4752 ImplicationChecksByTransitivity, 45.7s TimeCoverageRelationStatistics Valid=32214, Invalid=51596, Unknown=0, NotChecked=0, Total=83810 [2018-12-03 15:21:20,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-12-03 15:21:20,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2018-12-03 15:21:20,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-12-03 15:21:20,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-12-03 15:21:20,574 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2018-12-03 15:21:20,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:21:20,574 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-12-03 15:21:20,574 INFO L481 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-12-03 15:21:20,574 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-12-03 15:21:20,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-12-03 15:21:20,575 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:21:20,575 INFO L402 BasicCegarLoop]: trace histogram [97, 1, 1, 1] [2018-12-03 15:21:20,575 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:21:20,575 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:21:20,576 INFO L82 PathProgramCache]: Analyzing trace with hash -853360344, now seen corresponding path program 49 times [2018-12-03 15:21:20,576 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:21:20,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:21:20,576 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:21:20,577 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:21:20,577 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:21:21,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:21:25,885 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 15:21:25,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:21:25,885 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:21:25,885 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:21:25,885 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:21:25,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:21:25,885 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 15:21:25,893 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:21:25,894 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:21:26,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:21:27,161 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:21:29,092 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 15:21:29,093 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:21:42,381 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 15:21:42,401 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:21:42,401 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 198 [2018-12-03 15:21:42,401 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:21:42,401 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 15:21:42,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 15:21:42,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14463, Invalid=24939, Unknown=0, NotChecked=0, Total=39402 [2018-12-03 15:21:42,403 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 101 states. [2018-12-03 15:21:42,757 WARN L180 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 8 [2018-12-03 15:21:43,090 WARN L180 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 9 [2018-12-03 15:21:43,433 WARN L180 SmtUtils]: Spent 310.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2018-12-03 15:21:43,776 WARN L180 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2018-12-03 15:21:44,131 WARN L180 SmtUtils]: Spent 309.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 15:21:44,512 WARN L180 SmtUtils]: Spent 325.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 15:21:44,874 WARN L180 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 15:21:45,236 WARN L180 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 15:21:45,599 WARN L180 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 15:21:45,961 WARN L180 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 15:21:46,330 WARN L180 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 15:21:46,690 WARN L180 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 15:21:47,049 WARN L180 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 15:21:47,393 WARN L180 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 15:21:47,779 WARN L180 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 15:21:48,174 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 15:21:48,559 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:21:48,965 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:21:49,357 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:21:49,825 WARN L180 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:21:50,236 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:21:50,628 WARN L180 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:21:51,028 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:21:51,427 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:21:51,830 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:21:52,232 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:21:52,625 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:21:53,044 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:21:53,442 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:21:53,841 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:21:54,220 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:21:54,623 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:21:55,050 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:21:55,446 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:21:55,844 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:21:56,250 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:21:56,648 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:21:57,045 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11