java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_oct_cong.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/count_by_k.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 17:31:57,533 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 17:31:57,535 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 17:31:57,547 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2018-12-03 17:31:57,578 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_oct_cong.epf [2018-12-03 17:31:57,590 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 17:31:57,591 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 17:31:57,592 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 17:31:57,592 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 17:31:57,592 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 17:31:57,592 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 17:31:57,592 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 17:31:57,593 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 17:31:57,593 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 17:31:57,593 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 17:31:57,593 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 17:31:57,593 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 17:31:57,594 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 17:31:57,596 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 17:31:57,597 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 17:31:57,597 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 17:31:57,597 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 17:31:57,597 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 17:31:57,597 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 17:31:57,598 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 17:31:57,598 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 17:31:57,598 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 17:31:57,598 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 17:31:57,598 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 17:31:57,598 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 17:31:57,600 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 17:31:57,600 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 17:31:57,601 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 17:31:57,601 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 17:31:57,601 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 17:31:57,601 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 17:31:57,602 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 17:31:57,602 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 17:31:57,602 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 17:31:57,602 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 17:31:57,602 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 17:31:57,602 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 17:31:57,603 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 17:31:57,603 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 17:31:57,653 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 17:31:57,667 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 17:31:57,672 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 17:31:57,673 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 17:31:57,674 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 17:31:57,675 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/count_by_k.i_3.bpl [2018-12-03 17:31:57,675 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/count_by_k.i_3.bpl' [2018-12-03 17:31:57,711 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 17:31:57,712 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 17:31:57,713 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 17:31:57,713 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 17:31:57,713 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 17:31:57,733 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:31:57" (1/1) ... [2018-12-03 17:31:57,742 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:31:57" (1/1) ... [2018-12-03 17:31:57,749 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 17:31:57,750 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 17:31:57,750 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 17:31:57,750 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 17:31:57,762 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:31:57" (1/1) ... [2018-12-03 17:31:57,762 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:31:57" (1/1) ... [2018-12-03 17:31:57,763 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:31:57" (1/1) ... [2018-12-03 17:31:57,763 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:31:57" (1/1) ... [2018-12-03 17:31:57,767 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:31:57" (1/1) ... [2018-12-03 17:31:57,768 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:31:57" (1/1) ... [2018-12-03 17:31:57,769 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:31:57" (1/1) ... [2018-12-03 17:31:57,770 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 17:31:57,770 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 17:31:57,770 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 17:31:57,770 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 17:31:57,771 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:31:57" (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 17:31:57,829 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 17:31:57,829 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 17:31:58,045 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 17:31:58,045 INFO L280 CfgBuilder]: Removed 1 assue(true) statements. [2018-12-03 17:31:58,049 INFO L202 PluginConnector]: Adding new model count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 05:31:58 BoogieIcfgContainer [2018-12-03 17:31:58,049 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 17:31:58,050 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 17:31:58,050 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 17:31:58,055 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 17:31:58,055 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:31:57" (1/2) ... [2018-12-03 17:31:58,057 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a9233b4 and model type count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 05:31:58, skipping insertion in model container [2018-12-03 17:31:58,057 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 05:31:58" (2/2) ... [2018-12-03 17:31:58,060 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k.i_3.bpl [2018-12-03 17:31:58,071 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 17:31:58,081 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 17:31:58,101 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 17:31:58,143 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 17:31:58,144 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 17:31:58,144 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 17:31:58,144 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 17:31:58,144 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 17:31:58,144 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 17:31:58,145 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 17:31:58,145 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 17:31:58,162 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-12-03 17:31:58,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-12-03 17:31:58,177 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:31:58,178 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-12-03 17:31:58,184 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:31:58,190 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:31:58,190 INFO L82 PathProgramCache]: Analyzing trace with hash 29955, now seen corresponding path program 1 times [2018-12-03 17:31:58,192 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:31:58,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:31:58,238 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:31:58,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:31:58,239 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:31:58,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:31:58,390 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 17:31:58,392 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 17:31:58,392 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-03 17:31:58,393 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 17:31:58,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 17:31:58,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 17:31:58,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 17:31:58,412 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-12-03 17:31:58,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:31:58,472 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 17:31:58,473 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 17:31:58,474 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-12-03 17:31:58,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:31:58,486 INFO L225 Difference]: With dead ends: 9 [2018-12-03 17:31:58,486 INFO L226 Difference]: Without dead ends: 5 [2018-12-03 17:31:58,489 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 17:31:58,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-12-03 17:31:58,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-12-03 17:31:58,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-12-03 17:31:58,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 5 transitions. [2018-12-03 17:31:58,522 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 5 transitions. Word has length 3 [2018-12-03 17:31:58,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:31:58,523 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 5 transitions. [2018-12-03 17:31:58,523 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 17:31:58,523 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-12-03 17:31:58,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-03 17:31:58,524 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:31:58,524 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-03 17:31:58,524 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:31:58,525 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:31:58,525 INFO L82 PathProgramCache]: Analyzing trace with hash 930412, now seen corresponding path program 1 times [2018-12-03 17:31:58,525 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:31:58,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:31:58,526 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:31:58,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:31:58,527 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:31:58,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:31:58,674 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 17:31:58,674 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:31:58,675 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:31:58,676 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 5 with the following transitions: [2018-12-03 17:31:58,677 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9] [2018-12-03 17:31:58,810 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 17:31:58,810 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 17:31:59,212 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 17:31:59,213 INFO L272 AbstractInterpreter]: Visited 4 different actions 25 times. Merged at 3 different actions 21 times. Widened at 2 different actions 8 times. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 17:31:59,234 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:31:59,236 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 17:31:59,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:31:59,236 INFO 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 17:31:59,249 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:31:59,249 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:31:59,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:31:59,268 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:31:59,315 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 17:31:59,315 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:31:59,378 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 17:31:59,398 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:31:59,399 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2018-12-03 17:31:59,399 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:31:59,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 17:31:59,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 17:31:59,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-03 17:31:59,401 INFO L87 Difference]: Start difference. First operand 5 states and 5 transitions. Second operand 5 states. [2018-12-03 17:31:59,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:31:59,442 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 17:31:59,443 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 17:31:59,443 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 4 [2018-12-03 17:31:59,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:31:59,443 INFO L225 Difference]: With dead ends: 9 [2018-12-03 17:31:59,444 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 17:31:59,445 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-03 17:31:59,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 17:31:59,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 17:31:59,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 17:31:59,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-12-03 17:31:59,448 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-12-03 17:31:59,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:31:59,448 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-12-03 17:31:59,448 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 17:31:59,449 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-12-03 17:31:59,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 17:31:59,449 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:31:59,450 INFO L402 BasicCegarLoop]: trace histogram [3, 1, 1, 1] [2018-12-03 17:31:59,450 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:31:59,450 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:31:59,451 INFO L82 PathProgramCache]: Analyzing trace with hash 894183756, now seen corresponding path program 2 times [2018-12-03 17:31:59,451 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:31:59,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:31:59,452 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:31:59,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:31:59,453 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:31:59,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:31:59,567 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 17:31:59,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:31:59,568 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:31:59,568 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:31:59,569 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:31:59,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:31:59,569 INFO 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 17:31:59,584 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:31:59,584 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:31:59,621 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 17:31:59,621 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:31:59,624 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:31:59,742 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 17:31:59,742 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:00,086 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 17:32:00,105 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:00,105 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-12-03 17:32:00,105 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:00,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 17:32:00,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 17:32:00,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2018-12-03 17:32:00,109 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 7 states. [2018-12-03 17:32:00,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:00,330 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-12-03 17:32:00,331 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 17:32:00,331 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 6 [2018-12-03 17:32:00,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:00,332 INFO L225 Difference]: With dead ends: 11 [2018-12-03 17:32:00,332 INFO L226 Difference]: Without dead ends: 9 [2018-12-03 17:32:00,333 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2018-12-03 17:32:00,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-12-03 17:32:00,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-12-03 17:32:00,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 17:32:00,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-12-03 17:32:00,337 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-12-03 17:32:00,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:00,337 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-12-03 17:32:00,337 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 17:32:00,338 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-12-03 17:32:00,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 17:32:00,338 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:00,339 INFO L402 BasicCegarLoop]: trace histogram [5, 1, 1, 1] [2018-12-03 17:32:00,339 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:00,339 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:00,339 INFO L82 PathProgramCache]: Analyzing trace with hash 317188140, now seen corresponding path program 3 times [2018-12-03 17:32:00,340 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:00,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:00,341 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:32:00,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:00,341 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:00,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:00,582 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 17:32:00,583 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:00,583 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:00,583 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:00,583 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:00,583 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:00,583 INFO 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 17:32:00,601 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:32:00,602 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:32:00,613 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:32:00,613 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:32:00,615 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:00,675 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 17:32:00,675 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:01,202 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 17:32:01,235 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:01,235 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-12-03 17:32:01,235 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:01,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 17:32:01,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 17:32:01,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-12-03 17:32:01,241 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 9 states. [2018-12-03 17:32:01,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:01,458 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2018-12-03 17:32:01,460 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 17:32:01,460 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 8 [2018-12-03 17:32:01,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:01,461 INFO L225 Difference]: With dead ends: 13 [2018-12-03 17:32:01,462 INFO L226 Difference]: Without dead ends: 11 [2018-12-03 17:32:01,462 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=121, Invalid=221, Unknown=0, NotChecked=0, Total=342 [2018-12-03 17:32:01,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-12-03 17:32:01,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-12-03 17:32:01,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-12-03 17:32:01,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-12-03 17:32:01,466 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-12-03 17:32:01,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:01,466 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-12-03 17:32:01,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 17:32:01,467 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-12-03 17:32:01,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 17:32:01,467 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:01,467 INFO L402 BasicCegarLoop]: trace histogram [7, 1, 1, 1] [2018-12-03 17:32:01,468 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:01,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:01,468 INFO L82 PathProgramCache]: Analyzing trace with hash -124817652, now seen corresponding path program 4 times [2018-12-03 17:32:01,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:01,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:01,469 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:32:01,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:01,469 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:01,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:01,688 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 17:32:01,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:01,689 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:01,689 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:01,689 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:01,689 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:01,689 INFO 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 17:32:01,699 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:32:01,699 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:32:01,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:01,708 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:01,744 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 17:32:01,744 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:02,011 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 17:32:02,032 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:02,032 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-12-03 17:32:02,033 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:02,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 17:32:02,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 17:32:02,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2018-12-03 17:32:02,034 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 11 states. [2018-12-03 17:32:02,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:02,309 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2018-12-03 17:32:02,309 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 17:32:02,310 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 10 [2018-12-03 17:32:02,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:02,310 INFO L225 Difference]: With dead ends: 15 [2018-12-03 17:32:02,310 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 17:32:02,311 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=216, Invalid=384, Unknown=0, NotChecked=0, Total=600 [2018-12-03 17:32:02,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 17:32:02,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-12-03 17:32:02,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-12-03 17:32:02,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-12-03 17:32:02,315 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-12-03 17:32:02,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:02,315 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-12-03 17:32:02,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 17:32:02,315 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-12-03 17:32:02,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 17:32:02,316 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:02,316 INFO L402 BasicCegarLoop]: trace histogram [9, 1, 1, 1] [2018-12-03 17:32:02,316 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:02,316 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:02,317 INFO L82 PathProgramCache]: Analyzing trace with hash 309378540, now seen corresponding path program 5 times [2018-12-03 17:32:02,317 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:02,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:02,318 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:32:02,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:02,318 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:02,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:02,748 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 17:32:02,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:02,749 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:02,749 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:02,749 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:02,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:02,749 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:32:02,760 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:32:02,761 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:32:02,779 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 17:32:02,780 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:32:02,782 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:02,818 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 17:32:02,818 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:03,134 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 17:32:03,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:03,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-12-03 17:32:03,155 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:03,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 17:32:03,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 17:32:03,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=303, Unknown=0, NotChecked=0, Total=462 [2018-12-03 17:32:03,157 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 13 states. [2018-12-03 17:32:03,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:03,571 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2018-12-03 17:32:03,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 17:32:03,572 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 12 [2018-12-03 17:32:03,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:03,573 INFO L225 Difference]: With dead ends: 17 [2018-12-03 17:32:03,573 INFO L226 Difference]: Without dead ends: 15 [2018-12-03 17:32:03,574 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 17:32:03,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-12-03 17:32:03,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-12-03 17:32:03,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 17:32:03,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-12-03 17:32:03,578 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-12-03 17:32:03,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:03,579 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-12-03 17:32:03,579 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 17:32:03,579 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-12-03 17:32:03,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 17:32:03,579 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:03,580 INFO L402 BasicCegarLoop]: trace histogram [11, 1, 1, 1] [2018-12-03 17:32:03,580 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:03,580 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:03,580 INFO L82 PathProgramCache]: Analyzing trace with hash 960091340, now seen corresponding path program 6 times [2018-12-03 17:32:03,580 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:03,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:03,581 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:32:03,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:03,582 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:03,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:03,912 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 17:32:03,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:03,913 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:03,913 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:03,913 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:03,914 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:03,914 INFO 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 17:32:03,930 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:32:03,930 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:32:03,944 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:32:03,945 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:32:03,948 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:03,988 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 17:32:03,989 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:04,418 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 17:32:04,438 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:04,438 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-12-03 17:32:04,438 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:04,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 17:32:04,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 17:32:04,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2018-12-03 17:32:04,440 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 15 states. [2018-12-03 17:32:04,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:04,968 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2018-12-03 17:32:04,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 17:32:04,969 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 14 [2018-12-03 17:32:04,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:04,970 INFO L225 Difference]: With dead ends: 19 [2018-12-03 17:32:04,970 INFO L226 Difference]: Without dead ends: 17 [2018-12-03 17:32:04,971 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=490, Invalid=842, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 17:32:04,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-12-03 17:32:04,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-12-03 17:32:04,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-03 17:32:04,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-12-03 17:32:04,976 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-12-03 17:32:04,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:04,977 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-12-03 17:32:04,977 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 17:32:04,977 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-12-03 17:32:04,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 17:32:04,978 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:04,978 INFO L402 BasicCegarLoop]: trace histogram [13, 1, 1, 1] [2018-12-03 17:32:04,978 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:04,978 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:04,978 INFO L82 PathProgramCache]: Analyzing trace with hash -770133076, now seen corresponding path program 7 times [2018-12-03 17:32:04,978 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:04,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:04,979 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:32:04,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:04,980 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:05,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:05,225 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 17:32:05,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:05,226 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:05,227 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:05,227 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:05,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:05,227 INFO 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 17:32:05,242 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:32:05,242 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:32:05,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:05,257 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:05,300 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 17:32:05,301 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:05,782 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 17:32:05,802 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:05,803 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2018-12-03 17:32:05,803 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:05,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 17:32:05,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 17:32:05,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=565, Unknown=0, NotChecked=0, Total=870 [2018-12-03 17:32:05,805 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 17 states. [2018-12-03 17:32:06,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:06,279 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2018-12-03 17:32:06,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 17:32:06,288 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 16 [2018-12-03 17:32:06,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:06,288 INFO L225 Difference]: With dead ends: 21 [2018-12-03 17:32:06,288 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 17:32:06,290 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=669, Invalid=1137, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 17:32:06,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 17:32:06,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-12-03 17:32:06,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 17:32:06,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-12-03 17:32:06,295 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-12-03 17:32:06,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:06,296 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-12-03 17:32:06,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 17:32:06,296 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-12-03 17:32:06,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 17:32:06,297 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:06,297 INFO L402 BasicCegarLoop]: trace histogram [15, 1, 1, 1] [2018-12-03 17:32:06,297 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:06,297 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:06,298 INFO L82 PathProgramCache]: Analyzing trace with hash -1363453300, now seen corresponding path program 8 times [2018-12-03 17:32:06,298 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:06,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:06,299 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:32:06,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:06,299 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:06,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:07,113 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 17:32:07,114 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:07,114 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:07,115 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:07,115 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:07,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:07,115 INFO 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 17:32:07,133 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:32:07,133 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:32:07,150 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 17:32:07,151 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:32:07,152 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:07,214 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 17:32:07,215 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:08,106 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 17:32:08,125 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:08,125 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-12-03 17:32:08,125 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:08,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 17:32:08,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 17:32:08,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=396, Invalid=726, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 17:32:08,126 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 19 states. [2018-12-03 17:32:08,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:08,835 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2018-12-03 17:32:08,835 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 17:32:08,836 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 18 [2018-12-03 17:32:08,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:08,836 INFO L225 Difference]: With dead ends: 23 [2018-12-03 17:32:08,836 INFO L226 Difference]: Without dead ends: 21 [2018-12-03 17:32:08,837 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=876, Invalid=1476, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 17:32:08,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-12-03 17:32:08,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-12-03 17:32:08,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 17:32:08,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-12-03 17:32:08,842 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-12-03 17:32:08,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:08,842 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-12-03 17:32:08,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 17:32:08,843 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-12-03 17:32:08,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 17:32:08,843 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:08,843 INFO L402 BasicCegarLoop]: trace histogram [17, 1, 1, 1] [2018-12-03 17:32:08,844 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:08,844 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:08,844 INFO L82 PathProgramCache]: Analyzing trace with hash -313538196, now seen corresponding path program 9 times [2018-12-03 17:32:08,844 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:08,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:08,845 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:32:08,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:08,845 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:08,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:09,124 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 17:32:09,125 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:09,125 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:09,125 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:09,125 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:09,125 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:09,125 INFO 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 17:32:09,141 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:32:09,141 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:32:09,170 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:32:09,170 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:32:09,175 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:09,280 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 17:32:09,280 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:09,964 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 17:32:09,984 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:09,984 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-12-03 17:32:09,984 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:09,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 17:32:09,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 17:32:09,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=907, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 17:32:09,986 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 21 states. [2018-12-03 17:32:10,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:10,844 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-12-03 17:32:10,844 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 17:32:10,844 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 20 [2018-12-03 17:32:10,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:10,846 INFO L225 Difference]: With dead ends: 25 [2018-12-03 17:32:10,846 INFO L226 Difference]: Without dead ends: 23 [2018-12-03 17:32:10,847 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1111, Invalid=1859, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 17:32:10,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-03 17:32:10,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-12-03 17:32:10,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-12-03 17:32:10,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-12-03 17:32:10,853 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-12-03 17:32:10,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:10,853 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-12-03 17:32:10,853 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 17:32:10,853 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-12-03 17:32:10,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-12-03 17:32:10,854 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:10,854 INFO L402 BasicCegarLoop]: trace histogram [19, 1, 1, 1] [2018-12-03 17:32:10,854 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:10,855 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:10,855 INFO L82 PathProgramCache]: Analyzing trace with hash -662437812, now seen corresponding path program 10 times [2018-12-03 17:32:10,855 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:10,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:10,856 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:32:10,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:10,856 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:10,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:11,149 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 17:32:11,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:11,150 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:11,150 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:11,150 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:11,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:11,150 INFO 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 17:32:11,159 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:32:11,159 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:32:11,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:11,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:11,238 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 17:32:11,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:11,933 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 17:32:11,952 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:11,952 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2018-12-03 17:32:11,952 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:11,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 17:32:11,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 17:32:11,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=614, Invalid=1108, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 17:32:11,954 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 23 states. [2018-12-03 17:32:12,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:12,882 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2018-12-03 17:32:12,882 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 17:32:12,883 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 22 [2018-12-03 17:32:12,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:12,883 INFO L225 Difference]: With dead ends: 27 [2018-12-03 17:32:12,883 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 17:32:12,885 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1374, Invalid=2286, Unknown=0, NotChecked=0, Total=3660 [2018-12-03 17:32:12,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 17:32:12,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-12-03 17:32:12,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 17:32:12,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-12-03 17:32:12,890 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-12-03 17:32:12,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:12,890 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-12-03 17:32:12,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 17:32:12,891 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-12-03 17:32:12,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 17:32:12,891 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:12,891 INFO L402 BasicCegarLoop]: trace histogram [21, 1, 1, 1] [2018-12-03 17:32:12,891 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:12,892 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:12,892 INFO L82 PathProgramCache]: Analyzing trace with hash -947519700, now seen corresponding path program 11 times [2018-12-03 17:32:12,892 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:12,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:12,893 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:32:12,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:12,893 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:12,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:13,324 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 17:32:13,324 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:13,325 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:13,325 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:13,325 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:13,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:13,325 INFO 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 17:32:13,342 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:32:13,342 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:32:13,368 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-03 17:32:13,368 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:32:13,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:13,439 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 17:32:13,440 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:14,567 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 17:32:14,587 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:14,587 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-12-03 17:32:14,588 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:14,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-03 17:32:14,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-03 17:32:14,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=1329, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 17:32:14,589 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 25 states. [2018-12-03 17:32:15,782 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 11 [2018-12-03 17:32:15,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:15,874 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2018-12-03 17:32:15,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 17:32:15,875 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 24 [2018-12-03 17:32:15,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:15,876 INFO L225 Difference]: With dead ends: 29 [2018-12-03 17:32:15,876 INFO L226 Difference]: Without dead ends: 27 [2018-12-03 17:32:15,878 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1665, Invalid=2757, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 17:32:15,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-03 17:32:15,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-03 17:32:15,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 17:32:15,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-12-03 17:32:15,884 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-12-03 17:32:15,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:15,884 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-12-03 17:32:15,884 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-03 17:32:15,884 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-12-03 17:32:15,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 17:32:15,885 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:15,885 INFO L402 BasicCegarLoop]: trace histogram [23, 1, 1, 1] [2018-12-03 17:32:15,886 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:15,886 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:15,886 INFO L82 PathProgramCache]: Analyzing trace with hash -33307124, now seen corresponding path program 12 times [2018-12-03 17:32:15,886 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:15,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:15,887 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:32:15,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:15,887 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:15,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:16,316 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 17:32:16,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:16,317 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:16,317 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:16,317 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:16,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:16,318 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 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 17:32:16,326 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:32:16,327 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:32:16,376 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:32:16,376 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:32:16,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:16,589 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 17:32:16,590 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:17,586 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 17:32:17,605 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:17,606 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-12-03 17:32:17,606 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:17,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 17:32:17,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 17:32:17,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=880, Invalid=1570, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 17:32:17,608 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 27 states. [2018-12-03 17:32:19,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:19,301 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-12-03 17:32:19,301 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 17:32:19,302 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 26 [2018-12-03 17:32:19,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:19,303 INFO L225 Difference]: With dead ends: 31 [2018-12-03 17:32:19,303 INFO L226 Difference]: Without dead ends: 29 [2018-12-03 17:32:19,305 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1984, Invalid=3272, Unknown=0, NotChecked=0, Total=5256 [2018-12-03 17:32:19,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-12-03 17:32:19,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-12-03 17:32:19,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-12-03 17:32:19,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-12-03 17:32:19,310 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-12-03 17:32:19,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:19,310 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-12-03 17:32:19,310 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 17:32:19,310 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-12-03 17:32:19,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-12-03 17:32:19,311 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:19,311 INFO L402 BasicCegarLoop]: trace histogram [25, 1, 1, 1] [2018-12-03 17:32:19,312 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:19,312 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:19,312 INFO L82 PathProgramCache]: Analyzing trace with hash -1943317268, now seen corresponding path program 13 times [2018-12-03 17:32:19,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:19,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:19,313 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:32:19,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:19,313 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:19,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:19,747 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 17:32:19,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:19,748 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:19,748 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:19,748 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:19,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:19,748 INFO 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 17:32:19,758 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:32:19,759 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:32:19,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:19,799 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:19,878 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 17:32:19,878 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:20,856 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 17:32:20,874 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:20,874 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2018-12-03 17:32:20,874 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:20,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 17:32:20,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 17:32:20,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1031, Invalid=1831, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 17:32:20,876 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 29 states. [2018-12-03 17:32:21,120 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 11 [2018-12-03 17:32:22,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:22,395 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2018-12-03 17:32:22,395 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 17:32:22,396 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 28 [2018-12-03 17:32:22,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:22,396 INFO L225 Difference]: With dead ends: 33 [2018-12-03 17:32:22,397 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 17:32:22,400 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2331, Invalid=3831, Unknown=0, NotChecked=0, Total=6162 [2018-12-03 17:32:22,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 17:32:22,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-12-03 17:32:22,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 17:32:22,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-12-03 17:32:22,404 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-12-03 17:32:22,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:22,404 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-12-03 17:32:22,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 17:32:22,405 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-12-03 17:32:22,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 17:32:22,405 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:22,406 INFO L402 BasicCegarLoop]: trace histogram [27, 1, 1, 1] [2018-12-03 17:32:22,406 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:22,406 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:22,406 INFO L82 PathProgramCache]: Analyzing trace with hash 782937036, now seen corresponding path program 14 times [2018-12-03 17:32:22,406 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:22,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:22,407 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:32:22,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:22,407 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:22,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:22,976 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 17:32:22,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:22,976 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:22,976 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:22,977 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:22,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:22,977 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:32:22,987 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:32:22,987 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:32:23,005 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-03 17:32:23,006 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:32:23,009 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:23,082 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 17:32:23,082 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:24,462 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 17:32:24,481 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:24,481 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-12-03 17:32:24,481 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:24,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-12-03 17:32:24,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-12-03 17:32:24,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1194, Invalid=2112, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 17:32:24,483 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 31 states. [2018-12-03 17:32:26,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:26,061 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2018-12-03 17:32:26,062 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 17:32:26,062 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 30 [2018-12-03 17:32:26,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:26,063 INFO L225 Difference]: With dead ends: 35 [2018-12-03 17:32:26,063 INFO L226 Difference]: Without dead ends: 33 [2018-12-03 17:32:26,066 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2706, Invalid=4434, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 17:32:26,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-03 17:32:26,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-12-03 17:32:26,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-03 17:32:26,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-12-03 17:32:26,071 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-12-03 17:32:26,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:26,071 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-12-03 17:32:26,071 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-12-03 17:32:26,072 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-12-03 17:32:26,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 17:32:26,072 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:26,072 INFO L402 BasicCegarLoop]: trace histogram [29, 1, 1, 1] [2018-12-03 17:32:26,073 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:26,073 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:26,073 INFO L82 PathProgramCache]: Analyzing trace with hash 783272620, now seen corresponding path program 15 times [2018-12-03 17:32:26,073 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:26,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:26,074 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:32:26,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:26,074 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:26,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:26,643 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 17:32:26,643 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:26,644 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:26,644 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:26,644 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:26,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:26,644 INFO 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 17:32:26,655 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:32:26,655 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:32:26,696 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:32:26,696 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:32:26,713 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:26,770 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 17:32:26,770 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:29,420 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 17:32:29,438 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:29,439 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-12-03 17:32:29,439 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:29,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-12-03 17:32:29,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-12-03 17:32:29,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1369, Invalid=2413, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 17:32:29,441 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 33 states. [2018-12-03 17:32:31,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:31,307 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-12-03 17:32:31,307 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 17:32:31,308 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 32 [2018-12-03 17:32:31,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:31,309 INFO L225 Difference]: With dead ends: 37 [2018-12-03 17:32:31,309 INFO L226 Difference]: Without dead ends: 35 [2018-12-03 17:32:31,312 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=3109, Invalid=5081, Unknown=0, NotChecked=0, Total=8190 [2018-12-03 17:32:31,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-12-03 17:32:31,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-12-03 17:32:31,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-12-03 17:32:31,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-12-03 17:32:31,317 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-12-03 17:32:31,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:31,318 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-12-03 17:32:31,318 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-12-03 17:32:31,318 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-12-03 17:32:31,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-12-03 17:32:31,319 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:31,319 INFO L402 BasicCegarLoop]: trace histogram [31, 1, 1, 1] [2018-12-03 17:32:31,319 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:31,319 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:31,319 INFO L82 PathProgramCache]: Analyzing trace with hash 1105768844, now seen corresponding path program 16 times [2018-12-03 17:32:31,320 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:31,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:31,320 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:32:31,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:31,321 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:31,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:31,994 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 17:32:31,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:31,995 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:31,995 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:31,995 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:31,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:31,996 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:32:32,004 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:32:32,004 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:32:32,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:32,078 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:32,142 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 17:32:32,143 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:33,838 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 17:32:33,858 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:33,858 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2018-12-03 17:32:33,858 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:33,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 17:32:33,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 17:32:33,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1556, Invalid=2734, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 17:32:33,860 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 35 states. [2018-12-03 17:32:36,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:36,128 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-12-03 17:32:36,128 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 17:32:36,128 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 34 [2018-12-03 17:32:36,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:36,129 INFO L225 Difference]: With dead ends: 39 [2018-12-03 17:32:36,129 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 17:32:36,131 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=3540, Invalid=5772, Unknown=0, NotChecked=0, Total=9312 [2018-12-03 17:32:36,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 17:32:36,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-12-03 17:32:36,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 17:32:36,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-12-03 17:32:36,136 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-12-03 17:32:36,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:36,136 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-12-03 17:32:36,136 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 17:32:36,136 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-12-03 17:32:36,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-12-03 17:32:36,136 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:36,137 INFO L402 BasicCegarLoop]: trace histogram [33, 1, 1, 1] [2018-12-03 17:32:36,137 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:36,137 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:36,137 INFO L82 PathProgramCache]: Analyzing trace with hash 1786994796, now seen corresponding path program 17 times [2018-12-03 17:32:36,137 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:36,138 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:36,138 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:32:36,138 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:36,138 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:36,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:37,460 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 17:32:37,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:37,461 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:37,461 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:37,461 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:37,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:37,461 INFO 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 17:32:37,472 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:32:37,472 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:32:37,496 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-03 17:32:37,496 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:32:37,499 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:37,559 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 17:32:37,559 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:39,486 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 17:32:39,506 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:39,506 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-12-03 17:32:39,506 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:39,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-12-03 17:32:39,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-12-03 17:32:39,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1755, Invalid=3075, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 17:32:39,508 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 37 states. [2018-12-03 17:32:41,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:41,887 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2018-12-03 17:32:41,887 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 17:32:41,887 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 36 [2018-12-03 17:32:41,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:41,888 INFO L225 Difference]: With dead ends: 41 [2018-12-03 17:32:41,888 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 17:32:41,890 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=3999, Invalid=6507, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 17:32:41,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 17:32:41,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-12-03 17:32:41,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 17:32:41,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-12-03 17:32:41,895 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-12-03 17:32:41,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:41,896 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-12-03 17:32:41,896 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-12-03 17:32:41,896 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-12-03 17:32:41,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 17:32:41,897 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:41,897 INFO L402 BasicCegarLoop]: trace histogram [35, 1, 1, 1] [2018-12-03 17:32:41,897 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:41,897 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:41,897 INFO L82 PathProgramCache]: Analyzing trace with hash -684861620, now seen corresponding path program 18 times [2018-12-03 17:32:41,898 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:41,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:41,898 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:32:41,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:41,899 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:41,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:42,723 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 17:32:42,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:42,723 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:42,723 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:42,724 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:42,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:42,724 INFO 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 17:32:42,733 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:32:42,733 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:32:42,789 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:32:42,789 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:32:42,817 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:42,889 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:32:42,890 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:45,068 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 17:32:45,092 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:45,092 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-12-03 17:32:45,092 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:45,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-12-03 17:32:45,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-12-03 17:32:45,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1966, Invalid=3436, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 17:32:45,094 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 39 states. [2018-12-03 17:32:47,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:47,713 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-12-03 17:32:47,714 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 17:32:47,714 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 38 [2018-12-03 17:32:47,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:47,715 INFO L225 Difference]: With dead ends: 43 [2018-12-03 17:32:47,715 INFO L226 Difference]: Without dead ends: 41 [2018-12-03 17:32:47,717 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=4486, Invalid=7286, Unknown=0, NotChecked=0, Total=11772 [2018-12-03 17:32:47,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-12-03 17:32:47,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-12-03 17:32:47,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-12-03 17:32:47,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-12-03 17:32:47,723 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-12-03 17:32:47,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:47,723 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-12-03 17:32:47,723 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-12-03 17:32:47,723 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-12-03 17:32:47,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-12-03 17:32:47,724 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:47,724 INFO L402 BasicCegarLoop]: trace histogram [37, 1, 1, 1] [2018-12-03 17:32:47,724 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:47,724 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:47,724 INFO L82 PathProgramCache]: Analyzing trace with hash -1021962708, now seen corresponding path program 19 times [2018-12-03 17:32:47,724 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:47,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:47,725 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:32:47,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:47,726 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:47,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:49,184 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 17:32:49,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:49,184 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:49,184 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:49,184 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:49,185 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:49,185 INFO 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 17:32:49,193 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:32:49,193 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:32:49,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:49,285 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:49,356 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 17:32:49,356 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:51,386 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 17:32:51,406 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:51,406 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2018-12-03 17:32:51,406 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:51,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 17:32:51,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 17:32:51,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2189, Invalid=3817, Unknown=0, NotChecked=0, Total=6006 [2018-12-03 17:32:51,408 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 41 states. [2018-12-03 17:32:54,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:54,553 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2018-12-03 17:32:54,553 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 17:32:54,554 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 40 [2018-12-03 17:32:54,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:54,554 INFO L225 Difference]: With dead ends: 45 [2018-12-03 17:32:54,555 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 17:32:54,556 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 741 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=5001, Invalid=8109, Unknown=0, NotChecked=0, Total=13110 [2018-12-03 17:32:54,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 17:32:54,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-12-03 17:32:54,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-12-03 17:32:54,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-12-03 17:32:54,561 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2018-12-03 17:32:54,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:54,562 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-12-03 17:32:54,562 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 17:32:54,562 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-12-03 17:32:54,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 17:32:54,563 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:54,563 INFO L402 BasicCegarLoop]: trace histogram [39, 1, 1, 1] [2018-12-03 17:32:54,563 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:54,563 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:54,563 INFO L82 PathProgramCache]: Analyzing trace with hash 1441406220, now seen corresponding path program 20 times [2018-12-03 17:32:54,563 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:54,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:54,564 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:32:54,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:54,564 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:54,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:55,546 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 17:32:55,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:55,546 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:55,547 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:55,547 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:55,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:55,547 INFO 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 17:32:55,556 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:32:55,556 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:32:55,585 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-12-03 17:32:55,585 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:32:55,590 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:55,667 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 17:32:55,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:57,965 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 17:32:57,984 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:57,985 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-12-03 17:32:57,985 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:57,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-12-03 17:32:57,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-12-03 17:32:57,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2424, Invalid=4218, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 17:32:57,986 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 43 states. [2018-12-03 17:33:01,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:33:01,404 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2018-12-03 17:33:01,404 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 17:33:01,404 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 42 [2018-12-03 17:33:01,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:33:01,405 INFO L225 Difference]: With dead ends: 47 [2018-12-03 17:33:01,405 INFO L226 Difference]: Without dead ends: 45 [2018-12-03 17:33:01,407 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=5544, Invalid=8976, Unknown=0, NotChecked=0, Total=14520 [2018-12-03 17:33:01,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-12-03 17:33:01,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-12-03 17:33:01,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 17:33:01,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-12-03 17:33:01,413 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2018-12-03 17:33:01,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:33:01,414 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-12-03 17:33:01,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-12-03 17:33:01,414 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-12-03 17:33:01,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 17:33:01,415 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:33:01,415 INFO L402 BasicCegarLoop]: trace histogram [41, 1, 1, 1] [2018-12-03 17:33:01,415 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:33:01,415 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:33:01,415 INFO L82 PathProgramCache]: Analyzing trace with hash -2083001364, now seen corresponding path program 21 times [2018-12-03 17:33:01,415 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:33:01,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:01,416 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:33:01,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:01,416 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:33:01,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:33:02,534 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 17:33:02,535 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:02,535 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:33:02,535 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:33:02,535 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:33:02,535 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:02,535 INFO 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 17:33:02,544 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:33:02,544 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:33:02,620 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:33:02,620 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:33:02,660 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:33:02,734 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 17:33:02,734 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:33:05,429 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 17:33:05,447 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:33:05,448 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-12-03 17:33:05,448 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:33:05,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 17:33:05,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 17:33:05,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2671, Invalid=4639, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 17:33:05,449 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 45 states. [2018-12-03 17:33:09,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:33:09,396 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-12-03 17:33:09,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 17:33:09,399 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 44 [2018-12-03 17:33:09,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:33:09,399 INFO L225 Difference]: With dead ends: 49 [2018-12-03 17:33:09,399 INFO L226 Difference]: Without dead ends: 47 [2018-12-03 17:33:09,400 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 903 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=6115, Invalid=9887, Unknown=0, NotChecked=0, Total=16002 [2018-12-03 17:33:09,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-12-03 17:33:09,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-12-03 17:33:09,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-12-03 17:33:09,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-12-03 17:33:09,405 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2018-12-03 17:33:09,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:33:09,405 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-12-03 17:33:09,405 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 17:33:09,406 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-12-03 17:33:09,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-12-03 17:33:09,406 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:33:09,406 INFO L402 BasicCegarLoop]: trace histogram [43, 1, 1, 1] [2018-12-03 17:33:09,407 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:33:09,407 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:33:09,407 INFO L82 PathProgramCache]: Analyzing trace with hash -309493044, now seen corresponding path program 22 times [2018-12-03 17:33:09,407 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:33:09,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:09,408 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:33:09,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:09,408 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:33:09,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:33:10,450 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 17:33:10,450 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:10,451 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:33:10,451 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:33:10,451 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:33:10,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:10,451 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:33:10,466 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:33:10,467 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:33:10,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:33:10,597 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:33:10,707 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 17:33:10,708 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:33:13,305 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 17:33:13,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:33:13,324 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 89 [2018-12-03 17:33:13,324 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:33:13,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 17:33:13,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 17:33:13,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2930, Invalid=5080, Unknown=0, NotChecked=0, Total=8010 [2018-12-03 17:33:13,326 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 47 states. [2018-12-03 17:33:17,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:33:17,518 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2018-12-03 17:33:17,519 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 17:33:17,519 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 46 [2018-12-03 17:33:17,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:33:17,519 INFO L225 Difference]: With dead ends: 51 [2018-12-03 17:33:17,520 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 17:33:17,521 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 990 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=6714, Invalid=10842, Unknown=0, NotChecked=0, Total=17556 [2018-12-03 17:33:17,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 17:33:17,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-12-03 17:33:17,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 17:33:17,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-12-03 17:33:17,527 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2018-12-03 17:33:17,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:33:17,527 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-12-03 17:33:17,527 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 17:33:17,528 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-12-03 17:33:17,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 17:33:17,528 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:33:17,528 INFO L402 BasicCegarLoop]: trace histogram [45, 1, 1, 1] [2018-12-03 17:33:17,528 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:33:17,529 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:33:17,529 INFO L82 PathProgramCache]: Analyzing trace with hash -1070014036, now seen corresponding path program 23 times [2018-12-03 17:33:17,529 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:33:17,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:17,530 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:33:17,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:17,530 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:33:17,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:33:18,674 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 17:33:18,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:18,675 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:33:18,675 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:33:18,675 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:33:18,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:18,675 INFO 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 17:33:18,689 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:33:18,689 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:33:18,760 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 17:33:18,760 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:33:18,764 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:33:18,982 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 17:33:18,982 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:33:22,098 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 17:33:22,117 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:33:22,117 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-12-03 17:33:22,117 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:33:22,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-12-03 17:33:22,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-12-03 17:33:22,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3201, Invalid=5541, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 17:33:22,118 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 49 states. [2018-12-03 17:33:26,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:33:26,857 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2018-12-03 17:33:26,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-12-03 17:33:26,858 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 48 [2018-12-03 17:33:26,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:33:26,859 INFO L225 Difference]: With dead ends: 53 [2018-12-03 17:33:26,859 INFO L226 Difference]: Without dead ends: 51 [2018-12-03 17:33:26,860 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1081 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=7341, Invalid=11841, Unknown=0, NotChecked=0, Total=19182 [2018-12-03 17:33:26,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-12-03 17:33:26,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-12-03 17:33:26,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 17:33:26,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-12-03 17:33:26,865 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2018-12-03 17:33:26,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:33:26,865 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-12-03 17:33:26,866 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-12-03 17:33:26,866 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-12-03 17:33:26,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 17:33:26,866 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:33:26,866 INFO L402 BasicCegarLoop]: trace histogram [47, 1, 1, 1] [2018-12-03 17:33:26,867 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:33:26,867 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:33:26,867 INFO L82 PathProgramCache]: Analyzing trace with hash -1786247028, now seen corresponding path program 24 times [2018-12-03 17:33:26,867 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:33:26,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:26,868 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:33:26,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:26,868 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:33:27,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:33:28,493 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 17:33:28,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:28,493 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:33:28,493 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:33:28,493 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:33:28,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:28,494 INFO 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 17:33:28,502 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:33:28,503 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:33:28,610 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:33:28,610 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:33:28,670 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:33:28,749 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 17:33:28,749 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:33:32,157 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 17:33:32,176 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:33:32,176 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-12-03 17:33:32,176 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:33:32,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-12-03 17:33:32,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-12-03 17:33:32,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3484, Invalid=6022, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 17:33:32,177 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 51 states. [2018-12-03 17:33:32,413 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 9 [2018-12-03 17:33:32,534 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 17:33:37,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:33:37,370 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-12-03 17:33:37,370 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 17:33:37,370 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 50 [2018-12-03 17:33:37,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:33:37,371 INFO L225 Difference]: With dead ends: 55 [2018-12-03 17:33:37,371 INFO L226 Difference]: Without dead ends: 53 [2018-12-03 17:33:37,372 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1176 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=7996, Invalid=12884, Unknown=0, NotChecked=0, Total=20880 [2018-12-03 17:33:37,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-12-03 17:33:37,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-12-03 17:33:37,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-12-03 17:33:37,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-12-03 17:33:37,376 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2018-12-03 17:33:37,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:33:37,376 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-12-03 17:33:37,376 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-12-03 17:33:37,377 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-12-03 17:33:37,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-12-03 17:33:37,377 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:33:37,377 INFO L402 BasicCegarLoop]: trace histogram [49, 1, 1, 1] [2018-12-03 17:33:37,377 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:33:37,377 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:33:37,377 INFO L82 PathProgramCache]: Analyzing trace with hash 1403582316, now seen corresponding path program 25 times [2018-12-03 17:33:37,378 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:33:37,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:37,378 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:33:37,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:37,378 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:33:37,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:33:38,755 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 17:33:38,755 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:38,755 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:33:38,756 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:33:38,756 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:33:38,756 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:38,756 INFO 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 17:33:38,764 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:33:38,765 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:33:38,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:33:38,946 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:33:39,034 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 17:33:39,035 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:33:42,598 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 17:33:42,617 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:33:42,617 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 101 [2018-12-03 17:33:42,617 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:33:42,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 17:33:42,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 17:33:42,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3779, Invalid=6523, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 17:33:42,619 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 53 states. [2018-12-03 17:33:42,786 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 8 [2018-12-03 17:33:42,915 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 9 [2018-12-03 17:33:43,038 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:33:43,162 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:33:48,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:33:48,267 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2018-12-03 17:33:48,268 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 17:33:48,268 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 52 [2018-12-03 17:33:48,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:33:48,269 INFO L225 Difference]: With dead ends: 57 [2018-12-03 17:33:48,269 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 17:33:48,270 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1275 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=8679, Invalid=13971, Unknown=0, NotChecked=0, Total=22650 [2018-12-03 17:33:48,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 17:33:48,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-12-03 17:33:48,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-03 17:33:48,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-12-03 17:33:48,275 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2018-12-03 17:33:48,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:33:48,275 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-12-03 17:33:48,275 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 17:33:48,276 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-12-03 17:33:48,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 17:33:48,277 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:33:48,277 INFO L402 BasicCegarLoop]: trace histogram [51, 1, 1, 1] [2018-12-03 17:33:48,277 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:33:48,277 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:33:48,278 INFO L82 PathProgramCache]: Analyzing trace with hash 222932556, now seen corresponding path program 26 times [2018-12-03 17:33:48,278 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:33:48,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:48,278 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:33:48,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:48,279 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:33:48,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:33:49,826 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 17:33:49,826 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:49,826 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:33:49,826 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:33:49,826 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:33:49,826 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:49,827 INFO 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 17:33:49,836 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:33:49,836 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:33:49,869 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-12-03 17:33:49,870 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:33:49,873 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:33:49,978 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 17:33:49,979 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:33:53,947 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 17:33:53,967 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:33:53,967 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-12-03 17:33:53,967 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:33:53,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 17:33:53,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 17:33:53,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4086, Invalid=7044, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 17:33:53,969 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 55 states. [2018-12-03 17:33:54,100 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 8 [2018-12-03 17:33:54,226 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 9 [2018-12-03 17:33:54,357 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:33:54,482 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:33:54,614 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:33:54,745 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:33:55,312 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-12-03 17:33:55,483 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 11 [2018-12-03 17:34:00,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:34:00,130 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2018-12-03 17:34:00,131 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 17:34:00,131 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 54 [2018-12-03 17:34:00,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:34:00,132 INFO L225 Difference]: With dead ends: 59 [2018-12-03 17:34:00,132 INFO L226 Difference]: Without dead ends: 57 [2018-12-03 17:34:00,133 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1378 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=9390, Invalid=15102, Unknown=0, NotChecked=0, Total=24492 [2018-12-03 17:34:00,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-12-03 17:34:00,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-12-03 17:34:00,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-03 17:34:00,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-12-03 17:34:00,137 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2018-12-03 17:34:00,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:34:00,137 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-12-03 17:34:00,137 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 17:34:00,138 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-12-03 17:34:00,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-12-03 17:34:00,138 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:34:00,138 INFO L402 BasicCegarLoop]: trace histogram [53, 1, 1, 1] [2018-12-03 17:34:00,138 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:34:00,138 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:34:00,138 INFO L82 PathProgramCache]: Analyzing trace with hash -510120660, now seen corresponding path program 27 times [2018-12-03 17:34:00,139 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:34:00,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:34:00,139 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:34:00,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:34:00,139 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:34:00,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:34:01,941 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 17:34:01,941 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:34:01,941 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:34:01,941 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:34:01,942 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:34:01,942 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:34:01,942 INFO 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 17:34:01,952 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:34:01,953 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:34:02,099 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:34:02,099 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:34:02,177 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:34:02,293 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 17:34:02,293 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:34:06,455 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 17:34:06,473 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:34:06,474 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 109 [2018-12-03 17:34:06,474 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:34:06,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-12-03 17:34:06,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-12-03 17:34:06,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4405, Invalid=7585, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 17:34:06,475 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 57 states. [2018-12-03 17:34:06,617 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-12-03 17:34:06,746 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-12-03 17:34:06,882 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:34:07,018 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:34:07,157 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:34:07,292 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:34:07,428 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:34:07,713 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 17:34:13,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:34:13,187 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-12-03 17:34:13,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 17:34:13,188 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 56 [2018-12-03 17:34:13,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:34:13,189 INFO L225 Difference]: With dead ends: 61 [2018-12-03 17:34:13,189 INFO L226 Difference]: Without dead ends: 59 [2018-12-03 17:34:13,190 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1485 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=10129, Invalid=16277, Unknown=0, NotChecked=0, Total=26406 [2018-12-03 17:34:13,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-12-03 17:34:13,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-12-03 17:34:13,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-12-03 17:34:13,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-12-03 17:34:13,195 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2018-12-03 17:34:13,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:34:13,195 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-12-03 17:34:13,196 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-12-03 17:34:13,196 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-12-03 17:34:13,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-12-03 17:34:13,196 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:34:13,196 INFO L402 BasicCegarLoop]: trace histogram [55, 1, 1, 1] [2018-12-03 17:34:13,196 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:34:13,197 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:34:13,197 INFO L82 PathProgramCache]: Analyzing trace with hash -599624692, now seen corresponding path program 28 times [2018-12-03 17:34:13,197 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:34:13,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:34:13,198 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:34:13,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:34:13,198 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:34:13,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:34:15,009 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 17:34:15,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:34:15,009 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:34:15,009 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:34:15,010 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:34:15,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:34:15,010 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:34:15,021 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:34:15,021 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:34:15,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:34:15,272 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:34:15,383 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 17:34:15,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:34:19,881 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 17:34:19,901 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:34:19,901 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 113 [2018-12-03 17:34:19,901 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:34:19,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 17:34:19,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 17:34:19,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4736, Invalid=8146, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 17:34:19,903 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 59 states. [2018-12-03 17:34:20,054 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-12-03 17:34:20,193 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 9 [2018-12-03 17:34:20,361 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:34:20,506 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:34:20,662 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:34:20,810 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:34:20,973 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:34:21,133 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:34:21,284 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:34:21,444 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:34:21,601 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 17:34:27,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:34:27,444 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-12-03 17:34:27,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 17:34:27,444 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 58 [2018-12-03 17:34:27,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:34:27,445 INFO L225 Difference]: With dead ends: 63 [2018-12-03 17:34:27,445 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 17:34:27,447 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1596 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=10896, Invalid=17496, Unknown=0, NotChecked=0, Total=28392 [2018-12-03 17:34:27,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 17:34:27,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-12-03 17:34:27,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-12-03 17:34:27,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-12-03 17:34:27,451 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2018-12-03 17:34:27,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:34:27,451 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-12-03 17:34:27,451 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 17:34:27,451 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-12-03 17:34:27,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-12-03 17:34:27,452 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:34:27,452 INFO L402 BasicCegarLoop]: trace histogram [57, 1, 1, 1] [2018-12-03 17:34:27,452 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:34:27,452 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:34:27,453 INFO L82 PathProgramCache]: Analyzing trace with hash -713653524, now seen corresponding path program 29 times [2018-12-03 17:34:27,453 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:34:27,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:34:27,453 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:34:27,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:34:27,454 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:34:27,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:34:29,340 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 17:34:29,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:34:29,341 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:34:29,341 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:34:29,341 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:34:29,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:34:29,341 INFO 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 17:34:29,350 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:34:29,350 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:34:29,388 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-03 17:34:29,389 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:34:29,393 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:34:29,478 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 17:34:29,479 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:34:34,225 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 17:34:34,243 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:34:34,244 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 117 [2018-12-03 17:34:34,244 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:34:34,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-12-03 17:34:34,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-12-03 17:34:34,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5079, Invalid=8727, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 17:34:34,246 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 61 states. [2018-12-03 17:34:34,404 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 8 [2018-12-03 17:34:34,549 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 9 [2018-12-03 17:34:34,703 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:34:34,861 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:34:35,018 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:34:35,169 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:34:35,321 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:34:35,481 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:34:35,636 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:34:35,793 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:34:35,957 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:34:36,300 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 17:34:36,478 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 17:34:42,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:34:42,551 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2018-12-03 17:34:42,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-12-03 17:34:42,551 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 60 [2018-12-03 17:34:42,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:34:42,552 INFO L225 Difference]: With dead ends: 65 [2018-12-03 17:34:42,552 INFO L226 Difference]: Without dead ends: 63 [2018-12-03 17:34:42,553 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1711 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=11691, Invalid=18759, Unknown=0, NotChecked=0, Total=30450 [2018-12-03 17:34:42,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-12-03 17:34:42,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-12-03 17:34:42,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 17:34:42,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-12-03 17:34:42,558 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2018-12-03 17:34:42,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:34:42,559 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-12-03 17:34:42,559 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-12-03 17:34:42,559 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-12-03 17:34:42,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 17:34:42,559 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:34:42,560 INFO L402 BasicCegarLoop]: trace histogram [59, 1, 1, 1] [2018-12-03 17:34:42,560 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:34:42,560 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:34:42,560 INFO L82 PathProgramCache]: Analyzing trace with hash 1373788620, now seen corresponding path program 30 times [2018-12-03 17:34:42,560 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:34:42,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:34:42,561 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:34:42,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:34:42,561 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:34:42,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:34:44,547 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 17:34:44,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:34:44,547 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:34:44,547 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:34:44,547 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:34:44,548 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:34:44,548 INFO 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 17:34:44,558 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:34:44,558 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:34:44,746 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:34:44,746 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:34:44,853 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:34:45,008 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 17:34:45,009 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:34:50,267 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 17:34:50,286 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:34:50,286 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 121 [2018-12-03 17:34:50,286 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:34:50,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 17:34:50,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 17:34:50,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5434, Invalid=9328, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 17:34:50,288 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 63 states. [2018-12-03 17:34:50,485 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-12-03 17:34:50,638 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-12-03 17:34:50,802 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:34:50,964 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:34:51,124 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:34:51,287 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:34:51,456 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:34:51,638 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:34:51,814 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:34:51,983 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:34:52,154 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:34:52,320 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:34:52,486 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:34:52,826 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 17:34:53,194 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 17:34:59,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:34:59,119 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-12-03 17:34:59,119 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 17:34:59,120 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 62 [2018-12-03 17:34:59,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:34:59,120 INFO L225 Difference]: With dead ends: 67 [2018-12-03 17:34:59,120 INFO L226 Difference]: Without dead ends: 65 [2018-12-03 17:34:59,121 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1830 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=12514, Invalid=20066, Unknown=0, NotChecked=0, Total=32580 [2018-12-03 17:34:59,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-12-03 17:34:59,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2018-12-03 17:34:59,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-12-03 17:34:59,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-12-03 17:34:59,126 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2018-12-03 17:34:59,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:34:59,126 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-12-03 17:34:59,126 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 17:34:59,126 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-12-03 17:34:59,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-12-03 17:34:59,126 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:34:59,126 INFO L402 BasicCegarLoop]: trace histogram [61, 1, 1, 1] [2018-12-03 17:34:59,127 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:34:59,127 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:34:59,127 INFO L82 PathProgramCache]: Analyzing trace with hash 1655961772, now seen corresponding path program 31 times [2018-12-03 17:34:59,127 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:34:59,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:34:59,128 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:34:59,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:34:59,128 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:34:59,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:35:01,270 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 17:35:01,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:35:01,271 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:35:01,271 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:35:01,271 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:35:01,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:35:01,271 INFO 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 17:35:01,281 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:35:01,281 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:35:01,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:35:01,608 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:35:01,710 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 17:35:01,710 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:35:07,341 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 17:35:07,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:35:07,361 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 125 [2018-12-03 17:35:07,361 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:35:07,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 17:35:07,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 17:35:07,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5801, Invalid=9949, Unknown=0, NotChecked=0, Total=15750 [2018-12-03 17:35:07,364 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 65 states. [2018-12-03 17:35:07,532 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-12-03 17:35:07,692 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 9 [2018-12-03 17:35:07,859 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:35:08,027 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:35:08,200 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:35:08,368 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:35:08,532 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:35:08,695 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:35:08,872 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:35:09,045 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:35:09,220 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:35:09,393 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:35:09,574 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:35:09,740 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:35:09,926 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:35:10,111 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:35:16,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:35:16,747 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-12-03 17:35:16,748 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 17:35:16,748 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 64 [2018-12-03 17:35:16,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:35:16,749 INFO L225 Difference]: With dead ends: 69 [2018-12-03 17:35:16,749 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 17:35:16,751 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1953 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=13365, Invalid=21417, Unknown=0, NotChecked=0, Total=34782 [2018-12-03 17:35:16,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 17:35:16,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-12-03 17:35:16,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-12-03 17:35:16,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2018-12-03 17:35:16,756 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2018-12-03 17:35:16,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:35:16,756 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2018-12-03 17:35:16,756 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 17:35:16,756 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2018-12-03 17:35:16,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-12-03 17:35:16,757 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:35:16,757 INFO L402 BasicCegarLoop]: trace histogram [63, 1, 1, 1] [2018-12-03 17:35:16,757 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:35:16,757 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:35:16,757 INFO L82 PathProgramCache]: Analyzing trace with hash -2053546100, now seen corresponding path program 32 times [2018-12-03 17:35:16,757 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:35:16,758 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:35:16,758 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:35:16,758 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:35:16,758 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:35:16,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:35:19,239 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 17:35:19,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:35:19,239 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:35:19,240 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:35:19,240 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:35:19,240 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:35:19,240 INFO 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 17:35:19,249 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:35:19,249 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:35:19,307 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-12-03 17:35:19,307 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:35:19,313 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:35:19,431 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 17:35:19,431 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:35:25,186 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 17:35:25,206 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:35:25,206 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 129 [2018-12-03 17:35:25,206 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:35:25,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-12-03 17:35:25,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-12-03 17:35:25,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6180, Invalid=10590, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 17:35:25,208 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 67 states. [2018-12-03 17:35:25,384 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 8 [2018-12-03 17:35:25,560 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 9 [2018-12-03 17:35:25,735 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:35:25,910 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:35:26,097 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:35:26,276 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:35:26,455 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:35:26,634 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:35:26,822 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:35:27,003 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:35:27,185 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:35:27,371 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:35:27,586 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:35:27,782 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:35:27,974 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:35:28,158 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:35:28,523 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:35:29,085 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 17:35:35,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:35:35,433 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2018-12-03 17:35:35,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 17:35:35,434 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 66 [2018-12-03 17:35:35,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:35:35,435 INFO L225 Difference]: With dead ends: 71 [2018-12-03 17:35:35,435 INFO L226 Difference]: Without dead ends: 69 [2018-12-03 17:35:35,437 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 17:35:35,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-12-03 17:35:35,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-12-03 17:35:35,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-03 17:35:35,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-12-03 17:35:35,442 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2018-12-03 17:35:35,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:35:35,442 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-12-03 17:35:35,442 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-12-03 17:35:35,443 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-12-03 17:35:35,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-12-03 17:35:35,443 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:35:35,443 INFO L402 BasicCegarLoop]: trace histogram [65, 1, 1, 1] [2018-12-03 17:35:35,443 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:35:35,444 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:35:35,444 INFO L82 PathProgramCache]: Analyzing trace with hash -2067755412, now seen corresponding path program 33 times [2018-12-03 17:35:35,444 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:35:35,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:35:35,445 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:35:35,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:35:35,445 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:35:35,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:35:38,110 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 17:35:38,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:35:38,111 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:35:38,111 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:35:38,111 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:35:38,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:35:38,111 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:35:38,121 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:35:38,121 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:35:38,366 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:35:38,366 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:35:38,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:35:38,610 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 17:35:38,611 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:35:44,585 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 17:35:44,603 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:35:44,604 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 133 [2018-12-03 17:35:44,604 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:35:44,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-12-03 17:35:44,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-12-03 17:35:44,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6571, Invalid=11251, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 17:35:44,605 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 69 states. [2018-12-03 17:35:44,795 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-12-03 17:35:44,972 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-12-03 17:35:45,162 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:35:45,346 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:35:45,538 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:35:45,739 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:35:45,924 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:35:46,113 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:35:46,305 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:35:46,496 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:35:46,690 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:35:46,880 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:35:47,067 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:35:47,252 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:35:47,447 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:35:47,641 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:35:47,856 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:35:48,070 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:35:48,276 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:35:48,484 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:35:55,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:35:55,603 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-12-03 17:35:55,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 17:35:55,603 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 68 [2018-12-03 17:35:55,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:35:55,604 INFO L225 Difference]: With dead ends: 73 [2018-12-03 17:35:55,604 INFO L226 Difference]: Without dead ends: 71 [2018-12-03 17:35:55,607 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2211 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=15151, Invalid=24251, Unknown=0, NotChecked=0, Total=39402 [2018-12-03 17:35:55,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-12-03 17:35:55,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2018-12-03 17:35:55,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-12-03 17:35:55,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-12-03 17:35:55,612 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2018-12-03 17:35:55,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:35:55,612 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-12-03 17:35:55,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-12-03 17:35:55,612 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-12-03 17:35:55,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-12-03 17:35:55,612 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:35:55,612 INFO L402 BasicCegarLoop]: trace histogram [67, 1, 1, 1] [2018-12-03 17:35:55,613 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:35:55,613 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:35:55,613 INFO L82 PathProgramCache]: Analyzing trace with hash 1456964940, now seen corresponding path program 34 times [2018-12-03 17:35:55,613 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:35:55,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:35:55,614 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:35:55,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:35:55,614 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:35:55,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:35:59,335 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 17:35:59,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:35:59,335 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:35:59,335 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:35:59,335 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:35:59,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:35:59,336 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:35:59,345 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:35:59,345 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:35:59,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:35:59,767 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:35:59,884 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 17:35:59,885 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:36:06,831 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 17:36:06,851 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:36:06,851 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 137 [2018-12-03 17:36:06,851 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:36:06,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 17:36:06,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 17:36:06,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6974, Invalid=11932, Unknown=0, NotChecked=0, Total=18906 [2018-12-03 17:36:06,852 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 71 states. [2018-12-03 17:36:07,049 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-12-03 17:36:07,233 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 9 [2018-12-03 17:36:07,428 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:36:07,621 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:36:07,829 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:36:08,034 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:36:08,229 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:36:08,441 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:36:08,662 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:36:08,866 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:36:09,072 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:36:09,272 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:36:09,477 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:36:09,678 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:36:09,894 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:36:10,099 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:36:10,307 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:36:10,527 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:36:10,735 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:36:10,944 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:36:11,157 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:36:11,362 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:36:18,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:36:18,992 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2018-12-03 17:36:18,993 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 17:36:18,993 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 70 [2018-12-03 17:36:18,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:36:18,994 INFO L225 Difference]: With dead ends: 75 [2018-12-03 17:36:18,994 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 17:36:18,996 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2346 ImplicationChecksByTransitivity, 22.2s TimeCoverageRelationStatistics Valid=16086, Invalid=25734, Unknown=0, NotChecked=0, Total=41820 [2018-12-03 17:36:18,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 17:36:19,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2018-12-03 17:36:19,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 17:36:19,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2018-12-03 17:36:19,002 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2018-12-03 17:36:19,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:36:19,003 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2018-12-03 17:36:19,003 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 17:36:19,003 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2018-12-03 17:36:19,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 17:36:19,003 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:36:19,004 INFO L402 BasicCegarLoop]: trace histogram [69, 1, 1, 1] [2018-12-03 17:36:19,004 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:36:19,004 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:36:19,004 INFO L82 PathProgramCache]: Analyzing trace with hash -15973332, now seen corresponding path program 35 times [2018-12-03 17:36:19,004 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:36:19,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:36:19,005 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:36:19,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:36:19,005 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:36:19,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:36:21,604 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 17:36:21,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:36:21,605 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:36:21,605 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:36:21,605 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:36:21,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:36:21,605 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:36:21,630 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:36:21,630 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:36:21,683 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-12-03 17:36:21,684 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:36:21,688 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:36:21,798 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 17:36:21,798 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:36:28,578 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 17:36:28,596 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:36:28,597 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 141 [2018-12-03 17:36:28,597 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:36:28,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-12-03 17:36:28,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-12-03 17:36:28,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7389, Invalid=12633, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 17:36:28,598 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 73 states. [2018-12-03 17:36:28,814 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 8 [2018-12-03 17:36:29,031 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 9 [2018-12-03 17:36:29,262 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:36:29,466 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:36:29,672 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:36:29,871 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:36:30,080 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:36:30,283 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:36:30,495 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:36:30,713 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:36:30,922 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:36:31,153 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:36:31,368 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:36:31,574 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:36:31,798 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:36:32,015 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:36:32,226 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:36:32,434 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:36:32,645 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:36:32,863 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:36:33,083 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:36:33,306 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:36:33,519 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:36:33,974 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 17:36:34,202 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 17:36:41,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:36:41,486 INFO L93 Difference]: Finished difference Result 77 states and 78 transitions. [2018-12-03 17:36:41,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 17:36:41,486 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 72 [2018-12-03 17:36:41,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:36:41,487 INFO L225 Difference]: With dead ends: 77 [2018-12-03 17:36:41,487 INFO L226 Difference]: Without dead ends: 75 [2018-12-03 17:36:41,488 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 17:36:41,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-03 17:36:41,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-12-03 17:36:41,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-03 17:36:41,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-12-03 17:36:41,493 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2018-12-03 17:36:41,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:36:41,493 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-12-03 17:36:41,494 INFO L481 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-12-03 17:36:41,494 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-12-03 17:36:41,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-12-03 17:36:41,494 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:36:41,494 INFO L402 BasicCegarLoop]: trace histogram [71, 1, 1, 1] [2018-12-03 17:36:41,494 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:36:41,495 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:36:41,495 INFO L82 PathProgramCache]: Analyzing trace with hash 1829554956, now seen corresponding path program 36 times [2018-12-03 17:36:41,495 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:36:41,495 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:36:41,496 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:36:41,496 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:36:41,496 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:36:41,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:36:44,753 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 17:36:44,754 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:36:44,754 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:36:44,754 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:36:44,754 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:36:44,754 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:36:44,754 INFO 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 17:36:44,764 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:36:44,765 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:36:45,090 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:36:45,091 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:36:45,271 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:36:45,428 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 17:36:45,428 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:36:52,647 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 17:36:52,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:36:52,666 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 145 [2018-12-03 17:36:52,666 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:36:52,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-03 17:36:52,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-03 17:36:52,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7816, Invalid=13354, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 17:36:52,667 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 75 states. [2018-12-03 17:36:52,914 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-12-03 17:36:53,113 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-12-03 17:36:53,326 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:36:53,551 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:36:53,768 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:36:53,975 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:36:54,191 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:36:54,411 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:36:54,641 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:36:54,863 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:36:55,087 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:36:55,318 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:36:55,527 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:36:55,747 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:36:55,969 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:36:56,200 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:36:56,422 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:36:56,661 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:36:56,883 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:36:57,108 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:36:57,342 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:36:57,578 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:36:57,801 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:36:58,023 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:36:58,244 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:36:58,461 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:36:59,591 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 11 [2018-12-03 17:36:59,842 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 11 [2018-12-03 17:37:06,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:37:06,625 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-12-03 17:37:06,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 17:37:06,626 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 74 [2018-12-03 17:37:06,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:37:06,626 INFO L225 Difference]: With dead ends: 79 [2018-12-03 17:37:06,626 INFO L226 Difference]: Without dead ends: 77 [2018-12-03 17:37:06,628 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2628 ImplicationChecksByTransitivity, 23.6s TimeCoverageRelationStatistics Valid=18040, Invalid=28832, Unknown=0, NotChecked=0, Total=46872 [2018-12-03 17:37:06,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-12-03 17:37:06,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-12-03 17:37:06,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-12-03 17:37:06,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-12-03 17:37:06,634 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2018-12-03 17:37:06,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:37:06,635 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-12-03 17:37:06,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-03 17:37:06,635 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-12-03 17:37:06,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-12-03 17:37:06,635 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:37:06,636 INFO L402 BasicCegarLoop]: trace histogram [73, 1, 1, 1] [2018-12-03 17:37:06,636 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:37:06,636 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:37:06,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1560746476, now seen corresponding path program 37 times [2018-12-03 17:37:06,636 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:37:06,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:37:06,637 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:37:06,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:37:06,637 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:37:06,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:37:09,621 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 17:37:09,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:37:09,622 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:37:09,622 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:37:09,622 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:37:09,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:37:09,622 INFO 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 17:37:09,638 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:37:09,639 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:37:09,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:37:10,193 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:37:10,349 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 17:37:10,350 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:37:17,967 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 17:37:17,987 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:37:17,987 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 149 [2018-12-03 17:37:17,987 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:37:17,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 17:37:17,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 17:37:17,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8255, Invalid=14095, Unknown=0, NotChecked=0, Total=22350 [2018-12-03 17:37:17,989 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 77 states. [2018-12-03 17:37:18,215 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2018-12-03 17:37:18,428 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 9 [2018-12-03 17:37:18,651 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:37:18,879 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:37:19,102 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:37:19,321 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:37:19,544 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:37:19,766 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:37:19,996 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:37:20,259 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:37:20,506 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:37:20,742 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:37:20,976 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:37:21,202 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:37:21,446 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:37:21,684 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:37:21,918 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:37:22,164 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:37:22,397 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:37:22,639 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:37:22,875 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:37:23,111 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:37:23,355 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:37:23,593 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:37:23,832 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:37:24,068 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:37:24,320 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:37:24,558 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:37:32,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:37:32,851 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2018-12-03 17:37:32,851 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 17:37:32,851 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 76 [2018-12-03 17:37:32,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:37:32,852 INFO L225 Difference]: With dead ends: 81 [2018-12-03 17:37:32,852 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 17:37:32,854 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 221 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2775 ImplicationChecksByTransitivity, 24.8s TimeCoverageRelationStatistics Valid=19059, Invalid=30447, Unknown=0, NotChecked=0, Total=49506 [2018-12-03 17:37:32,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 17:37:32,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-12-03 17:37:32,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-12-03 17:37:32,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-12-03 17:37:32,858 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2018-12-03 17:37:32,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:37:32,859 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-12-03 17:37:32,859 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 17:37:32,859 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-12-03 17:37:32,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-12-03 17:37:32,859 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:37:32,859 INFO L402 BasicCegarLoop]: trace histogram [75, 1, 1, 1] [2018-12-03 17:37:32,859 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:37:32,860 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:37:32,860 INFO L82 PathProgramCache]: Analyzing trace with hash 933834956, now seen corresponding path program 38 times [2018-12-03 17:37:32,860 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:37:32,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:37:32,861 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:37:32,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:37:32,861 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:37:33,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:37:36,469 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 17:37:36,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:37:36,470 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:37:36,470 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:37:36,470 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:37:36,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:37:36,470 INFO 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 17:37:36,489 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:37:36,489 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:37:36,600 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-12-03 17:37:36,600 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:37:36,606 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:37:36,749 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 17:37:36,749 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:37:44,685 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 17:37:44,705 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:37:44,705 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 153 [2018-12-03 17:37:44,705 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:37:44,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-12-03 17:37:44,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-12-03 17:37:44,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8706, Invalid=14856, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 17:37:44,707 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 79 states. [2018-12-03 17:37:44,953 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 8 [2018-12-03 17:37:45,175 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 9 [2018-12-03 17:37:45,411 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:37:45,639 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:37:45,885 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:37:46,116 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:37:46,358 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:37:46,582 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:37:46,825 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:37:47,069 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:37:47,311 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:37:47,555 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:37:47,807 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:37:48,043 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:37:48,291 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:37:48,540 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:37:48,785 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:37:49,038 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:37:49,292 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:37:49,548 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:37:49,803 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:37:50,059 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:37:50,315 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:37:50,565 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:37:50,836 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:37:51,133 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:37:51,375 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:37:51,627 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:37:51,875 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:38:00,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:38:00,508 INFO L93 Difference]: Finished difference Result 83 states and 84 transitions. [2018-12-03 17:38:00,508 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-12-03 17:38:00,508 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 78 [2018-12-03 17:38:00,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:38:00,509 INFO L225 Difference]: With dead ends: 83 [2018-12-03 17:38:00,510 INFO L226 Difference]: Without dead ends: 81 [2018-12-03 17:38:00,511 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2926 ImplicationChecksByTransitivity, 26.7s TimeCoverageRelationStatistics Valid=20106, Invalid=32106, Unknown=0, NotChecked=0, Total=52212 [2018-12-03 17:38:00,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-12-03 17:38:00,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-12-03 17:38:00,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-03 17:38:00,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-12-03 17:38:00,517 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2018-12-03 17:38:00,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:38:00,517 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-12-03 17:38:00,517 INFO L481 AbstractCegarLoop]: Interpolant automaton has 79 states. [2018-12-03 17:38:00,517 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-12-03 17:38:00,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-12-03 17:38:00,517 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:38:00,518 INFO L402 BasicCegarLoop]: trace histogram [77, 1, 1, 1] [2018-12-03 17:38:00,518 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:38:00,518 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:38:00,518 INFO L82 PathProgramCache]: Analyzing trace with hash -232714324, now seen corresponding path program 39 times [2018-12-03 17:38:00,518 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:38:00,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:38:00,519 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:38:00,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:38:00,519 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:38:00,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:38:04,265 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 17:38:04,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:38:04,265 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:38:04,266 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:38:04,266 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:38:04,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:38:04,266 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:38:04,276 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:38:04,276 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:38:04,666 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:38:04,666 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:38:04,894 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:38:05,007 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 17:38:05,007 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:38:13,674 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 17:38:13,693 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:38:13,693 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 157 [2018-12-03 17:38:13,693 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:38:13,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-12-03 17:38:13,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-12-03 17:38:13,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9169, Invalid=15637, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 17:38:13,694 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 81 states. [2018-12-03 17:38:13,933 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 8 [2018-12-03 17:38:14,183 WARN L180 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 9 [2018-12-03 17:38:14,424 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:38:14,665 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:38:14,904 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:38:15,142 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:38:15,382 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:38:15,633 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:38:15,886 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:38:16,132 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:38:16,397 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:38:16,658 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:38:16,907 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:38:17,152 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:38:17,411 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:38:17,665 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:38:17,940 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:38:18,194 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:38:18,454 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:38:18,714 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:38:18,981 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:38:19,247 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:38:19,509 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:38:19,769 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:38:20,046 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:38:20,297 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:38:20,555 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:38:20,819 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:38:21,075 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:38:21,330 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:38:21,616 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:38:21,866 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:38:30,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:38:30,481 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2018-12-03 17:38:30,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 17:38:30,482 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 80 [2018-12-03 17:38:30,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:38:30,483 INFO L225 Difference]: With dead ends: 85 [2018-12-03 17:38:30,483 INFO L226 Difference]: Without dead ends: 83 [2018-12-03 17:38:30,484 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 233 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3081 ImplicationChecksByTransitivity, 28.5s TimeCoverageRelationStatistics Valid=21181, Invalid=33809, Unknown=0, NotChecked=0, Total=54990 [2018-12-03 17:38:30,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-12-03 17:38:30,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2018-12-03 17:38:30,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-12-03 17:38:30,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-12-03 17:38:30,488 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2018-12-03 17:38:30,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:38:30,488 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-12-03 17:38:30,488 INFO L481 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-12-03 17:38:30,489 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-12-03 17:38:30,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-12-03 17:38:30,489 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:38:30,489 INFO L402 BasicCegarLoop]: trace histogram [79, 1, 1, 1] [2018-12-03 17:38:30,489 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:38:30,489 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:38:30,489 INFO L82 PathProgramCache]: Analyzing trace with hash -300108148, now seen corresponding path program 40 times [2018-12-03 17:38:30,489 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:38:30,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:38:30,490 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:38:30,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:38:30,490 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:38:30,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:38:34,371 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 17:38:34,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:38:34,371 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:38:34,371 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:38:34,371 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:38:34,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:38:34,372 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:38:34,380 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:38:34,381 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:38:34,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:38:35,050 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:38:35,166 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 17:38:35,166 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:38:44,193 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 17:38:44,212 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:38:44,213 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 161 [2018-12-03 17:38:44,213 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:38:44,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 17:38:44,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 17:38:44,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9644, Invalid=16438, Unknown=0, NotChecked=0, Total=26082 [2018-12-03 17:38:44,215 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 83 states. [2018-12-03 17:38:44,481 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 8 [2018-12-03 17:38:44,727 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 9 [2018-12-03 17:38:44,986 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:38:45,239 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:38:45,507 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:38:45,763 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:38:46,021 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:38:46,281 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:38:46,545 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:38:46,809 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:38:47,080 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:38:47,397 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:38:47,661 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:38:47,914 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:38:48,187 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:38:48,447 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:38:48,708 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:38:48,985 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:38:49,267 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:38:49,555 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:38:49,851 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:38:50,134 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:38:50,448 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:38:50,726 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:38:51,012 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:38:51,298 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:38:51,581 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:38:51,867 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:38:52,152 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:38:52,423 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:38:52,702 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:38:52,975 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:38:53,251 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:38:53,520 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:38:53,796 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 17:38:54,064 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 17:39:02,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:39:02,744 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2018-12-03 17:39:02,745 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 17:39:02,745 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 82 [2018-12-03 17:39:02,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:39:02,746 INFO L225 Difference]: With dead ends: 87 [2018-12-03 17:39:02,746 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 17:39:02,748 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3240 ImplicationChecksByTransitivity, 30.7s TimeCoverageRelationStatistics Valid=22284, Invalid=35556, Unknown=0, NotChecked=0, Total=57840 [2018-12-03 17:39:02,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 17:39:02,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2018-12-03 17:39:02,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-12-03 17:39:02,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2018-12-03 17:39:02,754 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2018-12-03 17:39:02,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:39:02,754 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2018-12-03 17:39:02,754 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 17:39:02,754 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2018-12-03 17:39:02,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-12-03 17:39:02,755 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:39:02,755 INFO L402 BasicCegarLoop]: trace histogram [81, 1, 1, 1] [2018-12-03 17:39:02,755 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:39:02,755 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:39:02,755 INFO L82 PathProgramCache]: Analyzing trace with hash -641063572, now seen corresponding path program 41 times [2018-12-03 17:39:02,755 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:39:02,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:39:02,756 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:39:02,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:39:02,756 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:39:03,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:39:06,329 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 17:39:06,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:39:06,330 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:39:06,330 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:39:06,330 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:39:06,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:39:06,330 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:39:06,339 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:39:06,339 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:39:06,402 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-12-03 17:39:06,403 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:39:06,409 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:39:06,530 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 17:39:06,530 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:39:16,058 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 17:39:16,077 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:39:16,077 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 165 [2018-12-03 17:39:16,077 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:39:16,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-12-03 17:39:16,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-12-03 17:39:16,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10131, Invalid=17259, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 17:39:16,078 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 85 states. [2018-12-03 17:39:16,342 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 8 [2018-12-03 17:39:16,597 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 9 [2018-12-03 17:39:16,874 WARN L180 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:39:17,136 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:39:17,396 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:39:17,656 WARN L180 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:39:17,951 WARN L180 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:39:18,229 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:39:18,504 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:39:18,780 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:39:19,056 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:39:19,333 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:39:19,598 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:39:19,883 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:39:20,165 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:39:20,450 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:39:20,727 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:39:21,006 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:39:21,280 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:39:21,572 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:39:21,856 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:39:22,149 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:39:22,438 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:39:22,726 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:39:23,030 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:39:23,335 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:39:23,618 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:39:23,901 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:39:24,172 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:39:24,449 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:39:24,744 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:39:25,020 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:39:25,293 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:39:25,564 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:39:25,837 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:39:26,105 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:39:26,375 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 17:39:35,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:39:35,433 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2018-12-03 17:39:35,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-12-03 17:39:35,434 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 84 [2018-12-03 17:39:35,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:39:35,434 INFO L225 Difference]: With dead ends: 89 [2018-12-03 17:39:35,434 INFO L226 Difference]: Without dead ends: 87 [2018-12-03 17:39:35,437 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3403 ImplicationChecksByTransitivity, 31.6s TimeCoverageRelationStatistics Valid=23415, Invalid=37347, Unknown=0, NotChecked=0, Total=60762 [2018-12-03 17:39:35,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-12-03 17:39:35,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-12-03 17:39:35,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 17:39:35,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-12-03 17:39:35,443 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2018-12-03 17:39:35,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:39:35,444 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-12-03 17:39:35,444 INFO L481 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-12-03 17:39:35,444 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-12-03 17:39:35,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 17:39:35,445 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:39:35,445 INFO L402 BasicCegarLoop]: trace histogram [83, 1, 1, 1] [2018-12-03 17:39:35,445 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:39:35,445 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:39:35,445 INFO L82 PathProgramCache]: Analyzing trace with hash -1881711540, now seen corresponding path program 42 times [2018-12-03 17:39:35,445 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:39:35,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:39:35,446 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:39:35,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:39:35,446 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:39:36,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:39:39,588 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 17:39:39,588 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:39:39,588 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:39:39,589 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:39:39,589 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:39:39,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:39:39,589 INFO 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 17:39:39,607 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:39:39,607 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:39:40,089 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:39:40,090 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:39:40,376 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:39:40,492 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 17:39:40,493 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:39:50,415 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 17:39:50,436 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:39:50,437 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 169 [2018-12-03 17:39:50,437 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:39:50,437 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-12-03 17:39:50,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-12-03 17:39:50,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10630, Invalid=18100, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 17:39:50,438 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 87 states. [2018-12-03 17:39:50,727 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 8 [2018-12-03 17:39:50,992 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 9 [2018-12-03 17:39:51,266 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 17:39:51,714 WARN L180 SmtUtils]: Spent 415.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 17:39:51,992 WARN L180 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:39:52,263 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:39:52,545 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:39:52,820 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:39:53,101 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:39:53,386 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:39:53,686 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:39:54,001 WARN L180 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:39:54,287 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:39:54,567 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:39:54,854 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:39:55,143 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:39:55,429 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:39:55,718 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:39:56,016 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:39:56,313 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:39:56,611 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:39:56,910 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:39:57,209 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:39:57,503 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:39:57,799 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:39:58,110 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:39:58,416 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:39:58,720 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:39:59,036 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:39:59,323 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:39:59,626 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:39:59,915 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:40:00,206 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:40:00,488 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:40:00,763 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:40:01,039 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:40:01,316 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:40:01,599 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:40:01,874 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 17:40:11,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:40:11,137 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2018-12-03 17:40:11,137 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 17:40:11,137 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 86 [2018-12-03 17:40:11,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:40:11,138 INFO L225 Difference]: With dead ends: 91 [2018-12-03 17:40:11,138 INFO L226 Difference]: Without dead ends: 89 [2018-12-03 17:40:11,140 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 251 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3570 ImplicationChecksByTransitivity, 33.8s TimeCoverageRelationStatistics Valid=24574, Invalid=39182, Unknown=0, NotChecked=0, Total=63756 [2018-12-03 17:40:11,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-12-03 17:40:11,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-12-03 17:40:11,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-12-03 17:40:11,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-12-03 17:40:11,146 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2018-12-03 17:40:11,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:40:11,146 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-12-03 17:40:11,146 INFO L481 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-12-03 17:40:11,146 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-12-03 17:40:11,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-12-03 17:40:11,147 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:40:11,147 INFO L402 BasicCegarLoop]: trace histogram [85, 1, 1, 1] [2018-12-03 17:40:11,147 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:40:11,147 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:40:11,147 INFO L82 PathProgramCache]: Analyzing trace with hash -143500500, now seen corresponding path program 43 times [2018-12-03 17:40:11,147 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:40:11,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:40:11,148 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:40:11,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:40:11,148 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:40:11,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:40:15,266 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 17:40:15,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:40:15,267 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:40:15,267 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:40:15,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:40:15,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:40:15,267 INFO 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 17:40:15,276 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:40:15,276 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:40:15,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:40:16,098 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:40:16,221 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 17:40:16,222 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:40:26,525 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 17:40:26,544 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:40:26,545 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 173 [2018-12-03 17:40:26,545 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:40:26,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 17:40:26,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 17:40:26,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11141, Invalid=18961, Unknown=0, NotChecked=0, Total=30102 [2018-12-03 17:40:26,547 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 89 states. [2018-12-03 17:40:26,830 WARN L180 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 8 [2018-12-03 17:40:27,105 WARN L180 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 9 [2018-12-03 17:40:27,386 WARN L180 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 17:40:27,665 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 17:40:27,972 WARN L180 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 17:40:28,259 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 17:40:28,543 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:40:28,831 WARN L180 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:40:29,121 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:40:29,426 WARN L180 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:40:29,769 WARN L180 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:40:30,066 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:40:30,351 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:40:30,636 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:40:30,941 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:40:31,255 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:40:31,560 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:40:31,864 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:40:32,168 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:40:32,479 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:40:32,794 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:40:33,107 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:40:33,430 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:40:33,745 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:40:34,057 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:40:34,374 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:40:34,686 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:40:35,010 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:40:35,316 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:40:35,633 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:40:35,946 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:40:36,249 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:40:36,550 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:40:36,845 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:40:37,145 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:40:37,426 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:40:37,728 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:40:38,018 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:40:38,306 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:40:48,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:40:48,337 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2018-12-03 17:40:48,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 17:40:48,338 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 88 [2018-12-03 17:40:48,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:40:48,338 INFO L225 Difference]: With dead ends: 93 [2018-12-03 17:40:48,338 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 17:40:48,340 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 257 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3741 ImplicationChecksByTransitivity, 35.3s TimeCoverageRelationStatistics Valid=25761, Invalid=41061, Unknown=0, NotChecked=0, Total=66822 [2018-12-03 17:40:48,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 17:40:48,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-12-03 17:40:48,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-12-03 17:40:48,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2018-12-03 17:40:48,345 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2018-12-03 17:40:48,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:40:48,345 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2018-12-03 17:40:48,346 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 17:40:48,346 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2018-12-03 17:40:48,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-12-03 17:40:48,346 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:40:48,346 INFO L402 BasicCegarLoop]: trace histogram [87, 1, 1, 1] [2018-12-03 17:40:48,346 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:40:48,346 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:40:48,346 INFO L82 PathProgramCache]: Analyzing trace with hash -464969204, now seen corresponding path program 44 times [2018-12-03 17:40:48,347 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:40:48,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:40:48,347 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:40:48,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:40:48,347 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:40:48,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:40:52,602 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 17:40:52,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:40:52,602 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:40:52,603 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:40:52,603 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:40:52,603 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:40:52,603 INFO 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 17:40:52,612 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:40:52,612 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:40:52,680 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-12-03 17:40:52,680 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:40:52,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:40:52,816 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 17:40:52,817 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:41:03,430 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 17:41:03,449 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:41:03,449 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 177 [2018-12-03 17:41:03,449 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:41:03,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-12-03 17:41:03,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-12-03 17:41:03,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11664, Invalid=19842, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 17:41:03,451 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 91 states. [2018-12-03 17:41:03,749 WARN L180 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 8 [2018-12-03 17:41:04,042 WARN L180 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 9 [2018-12-03 17:41:04,335 WARN L180 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 17:41:04,628 WARN L180 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 17:41:04,928 WARN L180 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 17:41:05,218 WARN L180 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 17:41:05,534 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 17:41:05,852 WARN L180 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 17:41:06,154 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:41:06,463 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:41:06,770 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:41:07,067 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:41:07,366 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:41:07,680 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:41:07,988 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:41:08,299 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:41:08,603 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:41:08,907 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:41:09,215 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:41:09,528 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:41:09,857 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:41:10,177 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:41:10,511 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:41:10,848 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:41:11,168 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:41:11,496 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:41:11,822 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:41:12,163 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:41:12,489 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:41:12,807 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:41:13,134 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:41:13,459 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:41:13,765 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:41:14,081 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:41:14,393 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:41:14,695 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:41:14,999 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:41:15,294 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:41:15,598 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:41:15,901 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:41:16,201 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:41:16,491 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:41:17,079 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 17:41:26,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:41:26,585 INFO L93 Difference]: Finished difference Result 95 states and 96 transitions. [2018-12-03 17:41:26,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 17:41:26,585 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 90 [2018-12-03 17:41:26,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:41:26,586 INFO L225 Difference]: With dead ends: 95 [2018-12-03 17:41:26,586 INFO L226 Difference]: Without dead ends: 93 [2018-12-03 17:41:26,589 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3916 ImplicationChecksByTransitivity, 37.1s TimeCoverageRelationStatistics Valid=26976, Invalid=42984, Unknown=0, NotChecked=0, Total=69960 [2018-12-03 17:41:26,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-12-03 17:41:26,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-12-03 17:41:26,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-03 17:41:26,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-12-03 17:41:26,594 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2018-12-03 17:41:26,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:41:26,594 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-12-03 17:41:26,594 INFO L481 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-12-03 17:41:26,595 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-12-03 17:41:26,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-12-03 17:41:26,595 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:41:26,595 INFO L402 BasicCegarLoop]: trace histogram [89, 1, 1, 1] [2018-12-03 17:41:26,595 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:41:26,595 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:41:26,595 INFO L82 PathProgramCache]: Analyzing trace with hash -158748436, now seen corresponding path program 45 times [2018-12-03 17:41:26,596 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:41:26,596 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:41:26,596 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:41:26,596 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:41:26,596 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:41:27,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:41:30,818 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 17:41:30,819 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:41:30,819 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:41:30,819 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:41:30,819 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:41:30,819 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:41:30,819 INFO 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 17:41:30,830 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:41:30,830 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:41:31,415 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:41:31,415 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:41:31,767 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:41:31,899 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 17:41:31,899 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:41:43,028 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 17:41:43,046 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:41:43,047 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 181 [2018-12-03 17:41:43,047 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:41:43,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-12-03 17:41:43,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-12-03 17:41:43,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12199, Invalid=20743, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 17:41:43,049 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 93 states. [2018-12-03 17:41:43,342 WARN L180 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 8 [2018-12-03 17:41:43,630 WARN L180 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 9 [2018-12-03 17:41:43,931 WARN L180 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 17:41:44,242 WARN L180 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 17:41:44,552 WARN L180 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 17:41:44,865 WARN L180 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 17:41:45,173 WARN L180 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 17:41:45,486 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 17:41:45,804 WARN L180 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 17:41:46,117 WARN L180 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 17:41:46,474 WARN L180 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:41:46,798 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:41:47,120 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:41:47,432 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:41:47,765 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:41:48,091 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:41:48,434 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:41:48,771 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:41:49,118 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:41:49,456 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:41:49,796 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:41:50,132 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:41:50,465 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:41:50,799 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:41:51,141 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:41:51,496 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:41:51,850 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:41:52,194 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:41:52,525 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:41:52,864 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:41:53,197 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:41:53,524 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:41:53,846 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:41:54,181 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:41:54,522 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:41:54,842 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:41:55,161 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:41:55,483 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:41:55,786 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:41:56,088 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:41:56,381 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:41:56,720 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:41:57,330 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:42:07,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:42:07,799 INFO L93 Difference]: Finished difference Result 97 states and 98 transitions. [2018-12-03 17:42:07,799 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 17:42:07,799 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 92 [2018-12-03 17:42:07,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:42:07,800 INFO L225 Difference]: With dead ends: 97 [2018-12-03 17:42:07,800 INFO L226 Difference]: Without dead ends: 95 [2018-12-03 17:42:07,802 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 269 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4095 ImplicationChecksByTransitivity, 39.0s TimeCoverageRelationStatistics Valid=28219, Invalid=44951, Unknown=0, NotChecked=0, Total=73170 [2018-12-03 17:42:07,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-12-03 17:42:07,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2018-12-03 17:42:07,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-12-03 17:42:07,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-12-03 17:42:07,809 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2018-12-03 17:42:07,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:42:07,809 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-12-03 17:42:07,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-12-03 17:42:07,809 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-12-03 17:42:07,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-12-03 17:42:07,810 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:42:07,810 INFO L402 BasicCegarLoop]: trace histogram [91, 1, 1, 1] [2018-12-03 17:42:07,810 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:42:07,810 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:42:07,810 INFO L82 PathProgramCache]: Analyzing trace with hash 2061633484, now seen corresponding path program 46 times [2018-12-03 17:42:07,810 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:42:07,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:42:07,811 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:42:07,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:42:07,811 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:42:08,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:42:18,230 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 17:42:18,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:42:18,230 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:42:18,230 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:42:18,230 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:42:18,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:42:18,230 INFO 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 17:42:18,239 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:42:18,239 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:42:18,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:42:19,224 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:42:19,452 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 17:42:19,452 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:42:31,022 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 17:42:31,041 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:42:31,042 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 185 [2018-12-03 17:42:31,042 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:42:31,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 17:42:31,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 17:42:31,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12746, Invalid=21664, Unknown=0, NotChecked=0, Total=34410 [2018-12-03 17:42:31,044 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 95 states. [2018-12-03 17:42:31,366 WARN L180 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 8 [2018-12-03 17:42:31,674 WARN L180 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 9 [2018-12-03 17:42:31,987 WARN L180 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 17:42:32,337 WARN L180 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 17:42:32,676 WARN L180 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 17:42:32,987 WARN L180 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 17:42:33,311 WARN L180 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 17:42:33,637 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 17:42:33,963 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 17:42:34,306 WARN L180 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 17:42:34,629 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 17:42:34,951 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 17:42:35,274 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:42:35,588 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:42:35,933 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:42:36,288 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:42:36,631 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:42:37,015 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:42:37,351 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:42:37,736 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:42:38,115 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:42:38,458 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:42:38,807 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:42:39,161 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:42:39,510 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:42:39,865 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:42:40,231 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:42:40,628 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:42:40,980 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:42:41,326 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:42:41,663 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:42:42,015 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:42:42,356 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:42:42,734 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:42:43,081 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:42:43,426 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:42:43,764 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:42:44,103 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:42:44,432 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:42:44,740 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:42:45,050 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:42:45,374 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:42:45,691 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:42:46,014 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:42:46,341 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:42:46,653 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:42:47,928 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-12-03 17:42:57,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:42:57,143 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-12-03 17:42:57,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 17:42:57,144 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 94 [2018-12-03 17:42:57,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:42:57,144 INFO L225 Difference]: With dead ends: 99 [2018-12-03 17:42:57,144 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 17:42:57,146 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 275 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4278 ImplicationChecksByTransitivity, 47.1s TimeCoverageRelationStatistics Valid=29490, Invalid=46962, Unknown=0, NotChecked=0, Total=76452 [2018-12-03 17:42:57,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 17:42:57,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-12-03 17:42:57,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-12-03 17:42:57,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-12-03 17:42:57,151 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2018-12-03 17:42:57,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:42:57,151 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-12-03 17:42:57,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 17:42:57,151 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-12-03 17:42:57,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-12-03 17:42:57,151 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:42:57,152 INFO L402 BasicCegarLoop]: trace histogram [93, 1, 1, 1] [2018-12-03 17:42:57,152 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:42:57,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:42:57,152 INFO L82 PathProgramCache]: Analyzing trace with hash 1249912492, now seen corresponding path program 47 times [2018-12-03 17:42:57,152 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:42:57,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:42:57,153 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:42:57,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:42:57,153 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:42:57,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:43:02,351 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 17:43:02,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:43:02,352 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:43:02,352 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:43:02,352 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:43:02,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:43:02,352 INFO 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 17:43:02,361 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:43:02,361 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:43:02,434 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-12-03 17:43:02,435 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:43:02,442 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:43:02,655 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 17:43:02,656 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:43:14,778 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 17:43:14,797 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:43:14,797 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 189 [2018-12-03 17:43:14,797 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:43:14,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 97 states [2018-12-03 17:43:14,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2018-12-03 17:43:14,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13305, Invalid=22605, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 17:43:14,799 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 97 states. [2018-12-03 17:43:15,129 WARN L180 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 8 [2018-12-03 17:43:15,448 WARN L180 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 9 [2018-12-03 17:43:15,794 WARN L180 SmtUtils]: Spent 316.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 17:43:16,125 WARN L180 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 17:43:16,458 WARN L180 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 17:43:16,781 WARN L180 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 17:43:17,109 WARN L180 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 17:43:17,449 WARN L180 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 17:43:17,802 WARN L180 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 17:43:18,146 WARN L180 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 17:43:18,479 WARN L180 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 17:43:18,879 WARN L180 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 17:43:19,218 WARN L180 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 17:43:19,549 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 17:43:19,914 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:43:20,269 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:43:20,630 WARN L180 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:43:20,999 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:43:21,351 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:43:21,715 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:43:22,078 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:43:22,456 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:43:22,824 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:43:23,175 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:43:23,545 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:43:23,931 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:43:24,300 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:43:24,670 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:43:25,042 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:43:25,403 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:43:25,762 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:43:26,123 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:43:26,478 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:43:26,840 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:43:27,192 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:43:27,546 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:43:27,901 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:43:28,251 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:43:28,591 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:43:28,949 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:43:29,284 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:43:29,609 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:43:29,938 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:43:30,263 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:43:30,579 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:43:30,902 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:43:31,231 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:43:31,558 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:43:31,886 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 17:43:42,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:43:42,394 INFO L93 Difference]: Finished difference Result 101 states and 102 transitions. [2018-12-03 17:43:42,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-12-03 17:43:42,394 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 96 [2018-12-03 17:43:42,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:43:42,395 INFO L225 Difference]: With dead ends: 101 [2018-12-03 17:43:42,395 INFO L226 Difference]: Without dead ends: 99 [2018-12-03 17:43:42,397 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 17:43:42,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-12-03 17:43:42,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-12-03 17:43:42,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-12-03 17:43:42,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-12-03 17:43:42,405 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2018-12-03 17:43:42,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:43:42,405 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-12-03 17:43:42,405 INFO L481 AbstractCegarLoop]: Interpolant automaton has 97 states. [2018-12-03 17:43:42,405 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-12-03 17:43:42,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-12-03 17:43:42,406 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:43:42,406 INFO L402 BasicCegarLoop]: trace histogram [95, 1, 1, 1] [2018-12-03 17:43:42,406 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:43:42,406 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:43:42,406 INFO L82 PathProgramCache]: Analyzing trace with hash -1424880244, now seen corresponding path program 48 times [2018-12-03 17:43:42,406 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:43:42,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:43:42,407 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:43:42,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:43:42,407 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:43:43,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:43:47,843 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 17:43:47,844 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:43:47,844 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:43:47,844 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:43:47,844 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:43:47,844 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:43:47,844 INFO 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 17:43:47,854 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:43:47,854 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:43:48,566 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:43:48,566 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:43:48,990 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:43:49,330 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 17:43:49,331 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:44:02,109 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 17:44:02,128 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:44:02,129 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 193 [2018-12-03 17:44:02,129 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:44:02,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-12-03 17:44:02,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-12-03 17:44:02,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13876, Invalid=23566, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 17:44:02,131 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 99 states. [2018-12-03 17:44:02,469 WARN L180 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 8 [2018-12-03 17:44:02,800 WARN L180 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 9 [2018-12-03 17:44:03,149 WARN L180 SmtUtils]: Spent 319.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 17:44:03,490 WARN L180 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 17:44:03,831 WARN L180 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 17:44:04,172 WARN L180 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 17:44:04,526 WARN L180 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 17:44:04,887 WARN L180 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 17:44:05,260 WARN L180 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 17:44:05,607 WARN L180 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 17:44:05,951 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 17:44:06,306 WARN L180 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 17:44:06,663 WARN L180 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 17:44:07,001 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 17:44:07,370 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 17:44:07,747 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 17:44:08,102 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:44:08,471 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:44:08,835 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:44:09,215 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:44:09,592 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:44:10,001 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:44:10,376 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:44:10,758 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:44:11,129 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:44:11,502 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:44:11,875 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:44:12,262 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:44:12,654 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:44:13,025 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:44:13,412 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:44:13,777 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:44:14,149 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:44:14,524 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:44:14,910 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:44:15,279 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:44:15,668 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:44:16,038 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:44:16,395 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:44:16,741 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:44:17,083 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:44:17,417 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:44:17,743 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:44:18,078 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:44:18,421 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:44:18,753 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:44:19,093 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:44:19,429 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:44:19,763 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:44:20,105 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:44:31,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:44:31,235 INFO L93 Difference]: Finished difference Result 103 states and 104 transitions. [2018-12-03 17:44:31,235 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 17:44:31,235 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 98 [2018-12-03 17:44:31,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:44:31,236 INFO L225 Difference]: With dead ends: 103 [2018-12-03 17:44:31,236 INFO L226 Difference]: Without dead ends: 101 [2018-12-03 17:44:31,239 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 287 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4656 ImplicationChecksByTransitivity, 46.4s TimeCoverageRelationStatistics Valid=32116, Invalid=51116, Unknown=0, NotChecked=0, Total=83232 [2018-12-03 17:44:31,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-12-03 17:44:31,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2018-12-03 17:44:31,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-12-03 17:44:31,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-12-03 17:44:31,246 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2018-12-03 17:44:31,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:44:31,246 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-12-03 17:44:31,247 INFO L481 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-12-03 17:44:31,247 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-12-03 17:44:31,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-12-03 17:44:31,247 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:44:31,247 INFO L402 BasicCegarLoop]: trace histogram [97, 1, 1, 1] [2018-12-03 17:44:31,248 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:44:31,248 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:44:31,248 INFO L82 PathProgramCache]: Analyzing trace with hash 784710764, now seen corresponding path program 49 times [2018-12-03 17:44:31,248 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:44:31,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:44:31,249 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:44:31,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:44:31,249 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:44:31,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:44:36,511 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 17:44:36,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:44:36,511 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:44:36,511 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:44:36,511 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:44:36,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:44:36,512 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:44:36,521 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:44:36,521 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:44:37,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:44:37,738 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:44:39,593 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 17:44:39,594 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:44:52,900 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 17:44:52,919 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:44:52,919 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 197 [2018-12-03 17:44:52,919 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:44:52,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 17:44:52,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 17:44:52,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14459, Invalid=24547, Unknown=0, NotChecked=0, Total=39006 [2018-12-03 17:44:52,921 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 101 states. [2018-12-03 17:44:53,298 WARN L180 SmtUtils]: Spent 327.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 8 [2018-12-03 17:44:53,622 WARN L180 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 9 [2018-12-03 17:44:53,952 WARN L180 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2018-12-03 17:44:54,290 WARN L180 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2018-12-03 17:44:54,635 WARN L180 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 17:44:54,974 WARN L180 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 17:44:55,341 WARN L180 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 17:44:55,698 WARN L180 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 17:44:56,084 WARN L180 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 17:44:56,452 WARN L180 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 17:44:56,809 WARN L180 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 17:44:57,171 WARN L180 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 17:44:57,529 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 17:44:57,918 WARN L180 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11