java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/count_by_k.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 18:55:25,190 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 18:55:25,193 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 18:55:25,209 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2018-12-03 18:55:25,270 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf [2018-12-03 18:55:25,301 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 18:55:25,301 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 18:55:25,302 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 18:55:25,302 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 18:55:25,302 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 18:55:25,302 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 18:55:25,306 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 18:55:25,306 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 18:55:25,306 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 18:55:25,306 INFO L133 SettingsManager]: * Underlying domain=OctagonDomain [2018-12-03 18:55:25,307 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 18:55:25,307 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 18:55:25,307 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 18:55:25,307 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 18:55:25,308 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 18:55:25,308 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 18:55:25,308 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 18:55:25,308 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 18:55:25,310 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 18:55:25,310 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 18:55:25,310 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 18:55:25,311 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 18:55:25,311 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 18:55:25,311 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 18:55:25,311 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 18:55:25,312 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 18:55:25,312 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 18:55:25,312 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 18:55:25,313 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 18:55:25,313 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 18:55:25,313 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 18:55:25,313 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 18:55:25,313 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 18:55:25,314 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 18:55:25,314 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 18:55:25,314 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 18:55:25,314 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 18:55:25,314 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 18:55:25,315 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 18:55:25,315 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 18:55:25,366 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 18:55:25,381 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 18:55:25,387 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 18:55:25,389 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 18:55:25,390 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 18:55:25,391 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/count_by_k.i_3.bpl [2018-12-03 18:55:25,391 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/count_by_k.i_3.bpl' [2018-12-03 18:55:25,429 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 18:55:25,430 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 18:55:25,431 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 18:55:25,431 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 18:55:25,431 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 18:55:25,449 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 06:55:25" (1/1) ... [2018-12-03 18:55:25,459 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 06:55:25" (1/1) ... [2018-12-03 18:55:25,470 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 18:55:25,471 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 18:55:25,471 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 18:55:25,471 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 18:55:25,485 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 06:55:25" (1/1) ... [2018-12-03 18:55:25,485 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 06:55:25" (1/1) ... [2018-12-03 18:55:25,486 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 06:55:25" (1/1) ... [2018-12-03 18:55:25,486 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 06:55:25" (1/1) ... [2018-12-03 18:55:25,490 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 06:55:25" (1/1) ... [2018-12-03 18:55:25,492 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 06:55:25" (1/1) ... [2018-12-03 18:55:25,493 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 06:55:25" (1/1) ... [2018-12-03 18:55:25,494 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 18:55:25,495 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 18:55:25,495 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 18:55:25,496 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 18:55:25,497 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 06:55:25" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 18:55:25,571 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 18:55:25,571 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 18:55:25,808 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 18:55:25,809 INFO L280 CfgBuilder]: Removed 1 assue(true) statements. [2018-12-03 18:55:25,810 INFO L202 PluginConnector]: Adding new model count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 06:55:25 BoogieIcfgContainer [2018-12-03 18:55:25,810 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 18:55:25,811 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 18:55:25,811 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 18:55:25,814 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 18:55:25,815 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 06:55:25" (1/2) ... [2018-12-03 18:55:25,816 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3393be81 and model type count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 06:55:25, skipping insertion in model container [2018-12-03 18:55:25,817 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 06:55:25" (2/2) ... [2018-12-03 18:55:25,818 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k.i_3.bpl [2018-12-03 18:55:25,829 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 18:55:25,838 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 18:55:25,857 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 18:55:25,892 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 18:55:25,892 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 18:55:25,892 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 18:55:25,892 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 18:55:25,892 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 18:55:25,893 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 18:55:25,893 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 18:55:25,893 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 18:55:25,909 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-12-03 18:55:25,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-12-03 18:55:25,915 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:25,916 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-12-03 18:55:25,919 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:25,925 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:25,926 INFO L82 PathProgramCache]: Analyzing trace with hash 29955, now seen corresponding path program 1 times [2018-12-03 18:55:25,929 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:25,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:25,987 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:55:25,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:25,988 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:26,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:26,159 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:26,161 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 18:55:26,162 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-03 18:55:26,162 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 18:55:26,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 18:55:26,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 18:55:26,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 18:55:26,190 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-12-03 18:55:26,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:26,271 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 18:55:26,272 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 18:55:26,273 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-12-03 18:55:26,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:26,286 INFO L225 Difference]: With dead ends: 9 [2018-12-03 18:55:26,286 INFO L226 Difference]: Without dead ends: 5 [2018-12-03 18:55:26,289 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 18:55:26,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-12-03 18:55:26,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-12-03 18:55:26,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-12-03 18:55:26,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 5 transitions. [2018-12-03 18:55:26,356 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 5 transitions. Word has length 3 [2018-12-03 18:55:26,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:26,360 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 5 transitions. [2018-12-03 18:55:26,360 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 18:55:26,361 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-12-03 18:55:26,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-03 18:55:26,361 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:26,361 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-03 18:55:26,362 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:26,362 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:26,366 INFO L82 PathProgramCache]: Analyzing trace with hash 930412, now seen corresponding path program 1 times [2018-12-03 18:55:26,366 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:26,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:26,368 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:55:26,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:26,368 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:26,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:26,592 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:26,592 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:26,594 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:26,595 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 5 with the following transitions: [2018-12-03 18:55:26,599 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9] [2018-12-03 18:55:26,656 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 18:55:26,657 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 18:55:26,940 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 18:55:26,942 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 18:55:26,960 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:26,961 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 18:55:26,961 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:26,962 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:55:26,975 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:55:26,975 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:55:26,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:27,001 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:27,070 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:27,071 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:27,162 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:27,183 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:27,183 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2018-12-03 18:55:27,184 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:27,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 18:55:27,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 18:55:27,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-03 18:55:27,186 INFO L87 Difference]: Start difference. First operand 5 states and 5 transitions. Second operand 5 states. [2018-12-03 18:55:27,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:27,240 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 18:55:27,241 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 18:55:27,241 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 4 [2018-12-03 18:55:27,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:27,241 INFO L225 Difference]: With dead ends: 9 [2018-12-03 18:55:27,242 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 18:55:27,243 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-03 18:55:27,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 18:55:27,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 18:55:27,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 18:55:27,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-12-03 18:55:27,247 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-12-03 18:55:27,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:27,248 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-12-03 18:55:27,248 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 18:55:27,248 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-12-03 18:55:27,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 18:55:27,249 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:27,249 INFO L402 BasicCegarLoop]: trace histogram [3, 1, 1, 1] [2018-12-03 18:55:27,250 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:27,250 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:27,250 INFO L82 PathProgramCache]: Analyzing trace with hash 894183756, now seen corresponding path program 2 times [2018-12-03 18:55:27,250 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:27,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:27,252 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:55:27,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:27,252 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:27,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:27,355 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:27,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:27,355 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:27,356 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:27,356 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:27,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:27,356 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:55:27,366 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:55:27,367 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:55:27,396 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 18:55:27,397 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:55:27,399 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:27,484 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:27,485 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:27,938 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:27,957 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:27,957 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-12-03 18:55:27,958 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:27,958 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 18:55:27,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 18:55:27,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2018-12-03 18:55:27,959 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 7 states. [2018-12-03 18:55:28,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:28,170 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-12-03 18:55:28,170 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 18:55:28,170 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 6 [2018-12-03 18:55:28,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:28,171 INFO L225 Difference]: With dead ends: 11 [2018-12-03 18:55:28,171 INFO L226 Difference]: Without dead ends: 9 [2018-12-03 18:55:28,172 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 18:55:28,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-12-03 18:55:28,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-12-03 18:55:28,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 18:55:28,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-12-03 18:55:28,176 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-12-03 18:55:28,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:28,177 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-12-03 18:55:28,177 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 18:55:28,177 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-12-03 18:55:28,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 18:55:28,177 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:28,178 INFO L402 BasicCegarLoop]: trace histogram [5, 1, 1, 1] [2018-12-03 18:55:28,178 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:28,178 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:28,178 INFO L82 PathProgramCache]: Analyzing trace with hash 317188140, now seen corresponding path program 3 times [2018-12-03 18:55:28,179 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:28,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:28,181 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:55:28,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:28,182 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:28,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:28,419 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:28,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:28,420 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:28,420 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:28,420 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:28,421 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:28,421 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:55:28,438 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:55:28,438 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:55:28,471 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:55:28,471 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:55:28,473 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:28,536 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:28,536 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:29,047 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:29,075 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:29,075 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-12-03 18:55:29,076 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:29,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 18:55:29,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 18:55:29,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:55:29,077 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 9 states. [2018-12-03 18:55:29,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:29,279 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2018-12-03 18:55:29,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 18:55:29,281 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 8 [2018-12-03 18:55:29,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:29,282 INFO L225 Difference]: With dead ends: 13 [2018-12-03 18:55:29,282 INFO L226 Difference]: Without dead ends: 11 [2018-12-03 18:55:29,283 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 18:55:29,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-12-03 18:55:29,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-12-03 18:55:29,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-12-03 18:55:29,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-12-03 18:55:29,287 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-12-03 18:55:29,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:29,287 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-12-03 18:55:29,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 18:55:29,287 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-12-03 18:55:29,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 18:55:29,288 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:29,288 INFO L402 BasicCegarLoop]: trace histogram [7, 1, 1, 1] [2018-12-03 18:55:29,288 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:29,289 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:29,289 INFO L82 PathProgramCache]: Analyzing trace with hash -124817652, now seen corresponding path program 4 times [2018-12-03 18:55:29,289 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:29,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:29,290 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:55:29,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:29,291 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:29,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:29,422 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:29,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:29,423 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:29,423 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:29,423 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:29,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:29,423 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:55:29,433 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:55:29,433 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:55:29,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:29,443 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:29,489 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:29,490 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:29,731 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:29,750 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:29,750 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-12-03 18:55:29,750 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:29,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 18:55:29,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 18:55:29,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2018-12-03 18:55:29,752 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 11 states. [2018-12-03 18:55:30,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:30,173 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2018-12-03 18:55:30,174 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 18:55:30,174 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 10 [2018-12-03 18:55:30,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:30,175 INFO L225 Difference]: With dead ends: 15 [2018-12-03 18:55:30,175 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 18:55:30,176 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=216, Invalid=384, Unknown=0, NotChecked=0, Total=600 [2018-12-03 18:55:30,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 18:55:30,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-12-03 18:55:30,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-12-03 18:55:30,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-12-03 18:55:30,182 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-12-03 18:55:30,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:30,182 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-12-03 18:55:30,183 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 18:55:30,183 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-12-03 18:55:30,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 18:55:30,183 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:30,183 INFO L402 BasicCegarLoop]: trace histogram [9, 1, 1, 1] [2018-12-03 18:55:30,184 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:30,184 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:30,184 INFO L82 PathProgramCache]: Analyzing trace with hash 309378540, now seen corresponding path program 5 times [2018-12-03 18:55:30,184 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:30,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:30,185 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:55:30,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:30,186 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:30,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:30,710 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:30,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:30,711 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:30,711 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:30,711 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:30,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:30,711 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:55:30,726 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:55:30,726 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:55:30,743 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 18:55:30,744 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:55:30,746 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:30,793 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:30,794 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:31,105 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:31,125 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:31,125 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-12-03 18:55:31,125 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:31,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 18:55:31,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 18:55:31,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=303, Unknown=0, NotChecked=0, Total=462 [2018-12-03 18:55:31,127 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 13 states. [2018-12-03 18:55:31,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:31,627 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2018-12-03 18:55:31,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 18:55:31,628 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 12 [2018-12-03 18:55:31,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:31,629 INFO L225 Difference]: With dead ends: 17 [2018-12-03 18:55:31,630 INFO L226 Difference]: Without dead ends: 15 [2018-12-03 18:55:31,630 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=339, Invalid=591, Unknown=0, NotChecked=0, Total=930 [2018-12-03 18:55:31,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-12-03 18:55:31,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-12-03 18:55:31,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 18:55:31,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-12-03 18:55:31,634 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-12-03 18:55:31,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:31,635 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-12-03 18:55:31,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 18:55:31,635 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-12-03 18:55:31,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 18:55:31,635 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:31,635 INFO L402 BasicCegarLoop]: trace histogram [11, 1, 1, 1] [2018-12-03 18:55:31,636 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:31,636 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:31,636 INFO L82 PathProgramCache]: Analyzing trace with hash 960091340, now seen corresponding path program 6 times [2018-12-03 18:55:31,636 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:31,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:31,637 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:55:31,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:31,637 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:31,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:31,877 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:31,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:31,878 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:31,878 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:31,878 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:31,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:31,878 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:55:31,897 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:55:31,897 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:55:31,921 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:55:31,921 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:55:31,924 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:32,007 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:32,007 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:32,407 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:32,427 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:32,427 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-12-03 18:55:32,427 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:32,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 18:55:32,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 18:55:32,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2018-12-03 18:55:32,429 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 15 states. [2018-12-03 18:55:32,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:32,872 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2018-12-03 18:55:32,873 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 18:55:32,873 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 14 [2018-12-03 18:55:32,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:32,874 INFO L225 Difference]: With dead ends: 19 [2018-12-03 18:55:32,874 INFO L226 Difference]: Without dead ends: 17 [2018-12-03 18:55:32,875 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=490, Invalid=842, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 18:55:32,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-12-03 18:55:32,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-12-03 18:55:32,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-03 18:55:32,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-12-03 18:55:32,879 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-12-03 18:55:32,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:32,880 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-12-03 18:55:32,880 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 18:55:32,880 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-12-03 18:55:32,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 18:55:32,880 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:32,881 INFO L402 BasicCegarLoop]: trace histogram [13, 1, 1, 1] [2018-12-03 18:55:32,881 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:32,881 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:32,881 INFO L82 PathProgramCache]: Analyzing trace with hash -770133076, now seen corresponding path program 7 times [2018-12-03 18:55:32,881 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:32,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:32,882 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:55:32,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:32,882 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:32,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:33,077 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:33,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:33,077 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:33,078 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:33,078 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:33,078 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:33,078 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:55:33,088 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:55:33,088 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:55:33,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:33,114 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:33,162 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:33,162 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:33,535 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:33,554 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:33,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2018-12-03 18:55:33,554 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:33,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 18:55:33,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 18:55:33,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=565, Unknown=0, NotChecked=0, Total=870 [2018-12-03 18:55:33,556 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 17 states. [2018-12-03 18:55:34,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:34,107 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2018-12-03 18:55:34,110 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 18:55:34,110 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 16 [2018-12-03 18:55:34,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:34,111 INFO L225 Difference]: With dead ends: 21 [2018-12-03 18:55:34,111 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 18:55:34,112 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=669, Invalid=1137, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 18:55:34,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 18:55:34,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-12-03 18:55:34,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 18:55:34,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-12-03 18:55:34,116 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-12-03 18:55:34,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:34,117 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-12-03 18:55:34,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 18:55:34,117 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-12-03 18:55:34,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 18:55:34,118 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:34,118 INFO L402 BasicCegarLoop]: trace histogram [15, 1, 1, 1] [2018-12-03 18:55:34,118 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:34,118 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:34,118 INFO L82 PathProgramCache]: Analyzing trace with hash -1363453300, now seen corresponding path program 8 times [2018-12-03 18:55:34,118 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:34,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:34,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:55:34,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:34,120 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:34,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:34,700 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:34,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:34,700 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:34,701 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:34,701 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:34,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:34,701 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:55:34,711 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:55:34,711 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:55:34,725 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 18:55:34,725 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:55:34,727 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:34,777 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:34,777 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:35,804 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:35,824 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:35,824 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-12-03 18:55:35,824 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:35,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 18:55:35,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 18:55:35,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=396, Invalid=726, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 18:55:35,825 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 19 states. [2018-12-03 18:55:36,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:36,681 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2018-12-03 18:55:36,686 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 18:55:36,686 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 18 [2018-12-03 18:55:36,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:36,687 INFO L225 Difference]: With dead ends: 23 [2018-12-03 18:55:36,687 INFO L226 Difference]: Without dead ends: 21 [2018-12-03 18:55:36,688 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=876, Invalid=1476, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 18:55:36,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-12-03 18:55:36,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-12-03 18:55:36,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 18:55:36,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-12-03 18:55:36,693 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-12-03 18:55:36,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:36,694 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-12-03 18:55:36,694 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 18:55:36,694 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-12-03 18:55:36,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 18:55:36,695 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:36,695 INFO L402 BasicCegarLoop]: trace histogram [17, 1, 1, 1] [2018-12-03 18:55:36,695 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:36,695 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:36,695 INFO L82 PathProgramCache]: Analyzing trace with hash -313538196, now seen corresponding path program 9 times [2018-12-03 18:55:36,696 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:36,696 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:36,697 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:55:36,697 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:36,697 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:36,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:36,993 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:36,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:36,993 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:36,994 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:36,994 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:36,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:36,994 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:55:37,014 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:55:37,014 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:55:37,049 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:55:37,049 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:55:37,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:37,166 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:37,166 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:37,977 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:37,997 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:37,997 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-12-03 18:55:37,997 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:37,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 18:55:37,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 18:55:37,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=907, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 18:55:37,999 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 21 states. [2018-12-03 18:55:38,536 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 11 [2018-12-03 18:55:39,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:39,158 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-12-03 18:55:39,158 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 18:55:39,158 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 20 [2018-12-03 18:55:39,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:39,160 INFO L225 Difference]: With dead ends: 25 [2018-12-03 18:55:39,160 INFO L226 Difference]: Without dead ends: 23 [2018-12-03 18:55:39,161 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1111, Invalid=1859, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 18:55:39,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-03 18:55:39,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-12-03 18:55:39,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-12-03 18:55:39,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-12-03 18:55:39,166 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-12-03 18:55:39,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:39,167 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-12-03 18:55:39,167 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 18:55:39,167 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-12-03 18:55:39,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-12-03 18:55:39,168 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:39,168 INFO L402 BasicCegarLoop]: trace histogram [19, 1, 1, 1] [2018-12-03 18:55:39,168 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:39,168 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:39,168 INFO L82 PathProgramCache]: Analyzing trace with hash -662437812, now seen corresponding path program 10 times [2018-12-03 18:55:39,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:39,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:39,170 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:55:39,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:39,170 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:39,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:39,507 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:39,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:39,508 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:39,508 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:39,508 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:39,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:39,509 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:55:39,518 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:55:39,518 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:55:39,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:39,543 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:39,613 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:39,614 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:40,387 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:40,414 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:40,414 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2018-12-03 18:55:40,415 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:40,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 18:55:40,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 18:55:40,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=614, Invalid=1108, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 18:55:40,416 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 23 states. [2018-12-03 18:55:41,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:41,223 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2018-12-03 18:55:41,224 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 18:55:41,224 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 22 [2018-12-03 18:55:41,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:41,225 INFO L225 Difference]: With dead ends: 27 [2018-12-03 18:55:41,225 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 18:55:41,226 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 18:55:41,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 18:55:41,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-12-03 18:55:41,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 18:55:41,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-12-03 18:55:41,231 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-12-03 18:55:41,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:41,232 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-12-03 18:55:41,232 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 18:55:41,232 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-12-03 18:55:41,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 18:55:41,232 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:41,233 INFO L402 BasicCegarLoop]: trace histogram [21, 1, 1, 1] [2018-12-03 18:55:41,233 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:41,233 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:41,233 INFO L82 PathProgramCache]: Analyzing trace with hash -947519700, now seen corresponding path program 11 times [2018-12-03 18:55:41,233 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:41,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:41,234 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:55:41,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:41,234 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:41,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:41,567 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 18:55:41,567 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:41,567 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:41,568 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:41,568 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:41,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:41,568 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:55:41,586 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:55:41,587 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:55:41,616 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-03 18:55:41,617 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:55:41,619 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:41,671 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:41,671 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:42,889 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:42,920 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:42,920 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-12-03 18:55:42,920 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:42,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-03 18:55:42,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-03 18:55:42,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=1329, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 18:55:42,922 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 25 states. [2018-12-03 18:55:44,196 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 11 [2018-12-03 18:55:44,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:44,281 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2018-12-03 18:55:44,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 18:55:44,283 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 24 [2018-12-03 18:55:44,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:44,284 INFO L225 Difference]: With dead ends: 29 [2018-12-03 18:55:44,284 INFO L226 Difference]: Without dead ends: 27 [2018-12-03 18:55:44,286 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 18:55:44,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-03 18:55:44,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-03 18:55:44,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 18:55:44,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-12-03 18:55:44,291 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-12-03 18:55:44,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:44,291 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-12-03 18:55:44,291 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-03 18:55:44,291 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-12-03 18:55:44,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 18:55:44,292 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:44,292 INFO L402 BasicCegarLoop]: trace histogram [23, 1, 1, 1] [2018-12-03 18:55:44,292 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:44,293 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:44,293 INFO L82 PathProgramCache]: Analyzing trace with hash -33307124, now seen corresponding path program 12 times [2018-12-03 18:55:44,293 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:44,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:44,294 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:55:44,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:44,294 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:44,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:44,699 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:44,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:44,699 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:44,699 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:44,700 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:44,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:44,700 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:55:44,709 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:55:44,710 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:55:44,758 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:55:44,758 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:55:44,771 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:44,972 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:44,973 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:46,157 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:46,178 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:46,178 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-12-03 18:55:46,178 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:46,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 18:55:46,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 18:55:46,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=880, Invalid=1570, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:55:46,180 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 27 states. [2018-12-03 18:55:47,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:47,586 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-12-03 18:55:47,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 18:55:47,587 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 26 [2018-12-03 18:55:47,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:47,587 INFO L225 Difference]: With dead ends: 31 [2018-12-03 18:55:47,588 INFO L226 Difference]: Without dead ends: 29 [2018-12-03 18:55:47,590 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 18:55:47,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-12-03 18:55:47,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-12-03 18:55:47,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-12-03 18:55:47,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-12-03 18:55:47,596 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-12-03 18:55:47,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:47,596 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-12-03 18:55:47,596 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 18:55:47,596 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-12-03 18:55:47,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-12-03 18:55:47,597 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:47,597 INFO L402 BasicCegarLoop]: trace histogram [25, 1, 1, 1] [2018-12-03 18:55:47,597 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:47,597 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:47,597 INFO L82 PathProgramCache]: Analyzing trace with hash -1943317268, now seen corresponding path program 13 times [2018-12-03 18:55:47,598 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:47,598 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:47,598 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:55:47,598 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:47,599 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:47,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:48,048 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:48,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:48,048 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:48,048 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:48,048 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:48,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:48,049 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:55:48,058 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:55:48,058 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:55:48,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:48,111 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:48,170 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:48,171 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:49,226 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:49,247 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:49,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2018-12-03 18:55:49,247 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:49,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 18:55:49,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 18:55:49,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1031, Invalid=1831, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 18:55:49,249 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 29 states. [2018-12-03 18:55:49,498 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 11 [2018-12-03 18:55:50,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:50,977 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2018-12-03 18:55:50,978 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 18:55:50,978 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 28 [2018-12-03 18:55:50,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:50,979 INFO L225 Difference]: With dead ends: 33 [2018-12-03 18:55:50,979 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 18:55:50,982 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2331, Invalid=3831, Unknown=0, NotChecked=0, Total=6162 [2018-12-03 18:55:50,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 18:55:50,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-12-03 18:55:50,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 18:55:50,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-12-03 18:55:50,987 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-12-03 18:55:50,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:50,987 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-12-03 18:55:50,988 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 18:55:50,988 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-12-03 18:55:50,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 18:55:50,988 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:50,988 INFO L402 BasicCegarLoop]: trace histogram [27, 1, 1, 1] [2018-12-03 18:55:50,989 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:50,989 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:50,989 INFO L82 PathProgramCache]: Analyzing trace with hash 782937036, now seen corresponding path program 14 times [2018-12-03 18:55:50,989 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:50,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:50,990 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:55:50,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:50,990 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:51,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:51,578 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:51,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:51,579 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:51,579 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:51,579 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:51,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:51,580 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:55:51,588 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:55:51,588 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:55:51,612 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-03 18:55:51,613 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:55:51,616 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:51,660 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:51,660 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:52,880 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:52,899 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:52,899 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-12-03 18:55:52,899 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:52,899 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-12-03 18:55:52,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-12-03 18:55:52,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1194, Invalid=2112, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 18:55:52,901 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 31 states. [2018-12-03 18:55:54,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:54,492 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2018-12-03 18:55:54,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 18:55:54,492 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 30 [2018-12-03 18:55:54,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:54,493 INFO L225 Difference]: With dead ends: 35 [2018-12-03 18:55:54,493 INFO L226 Difference]: Without dead ends: 33 [2018-12-03 18:55:54,497 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2706, Invalid=4434, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 18:55:54,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-03 18:55:54,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-12-03 18:55:54,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-03 18:55:54,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-12-03 18:55:54,502 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-12-03 18:55:54,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:54,503 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-12-03 18:55:54,503 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-12-03 18:55:54,503 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-12-03 18:55:54,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 18:55:54,504 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:54,504 INFO L402 BasicCegarLoop]: trace histogram [29, 1, 1, 1] [2018-12-03 18:55:54,504 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:54,504 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:54,504 INFO L82 PathProgramCache]: Analyzing trace with hash 783272620, now seen corresponding path program 15 times [2018-12-03 18:55:54,505 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:54,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:54,505 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:55:54,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:54,506 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:54,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:55:55,052 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:55,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:55,052 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:55:55,053 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:55:55,053 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:55:55,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:55:55,053 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:55:55,062 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:55:55,062 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:55:55,105 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:55:55,105 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:55:55,122 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:55:55,883 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:55,883 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:55:57,652 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:55:57,671 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:55:57,671 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-12-03 18:55:57,671 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:55:57,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-12-03 18:55:57,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-12-03 18:55:57,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1369, Invalid=2413, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 18:55:57,674 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 33 states. [2018-12-03 18:55:59,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:55:59,494 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-12-03 18:55:59,495 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 18:55:59,495 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 32 [2018-12-03 18:55:59,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:55:59,496 INFO L225 Difference]: With dead ends: 37 [2018-12-03 18:55:59,496 INFO L226 Difference]: Without dead ends: 35 [2018-12-03 18:55:59,499 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3109, Invalid=5081, Unknown=0, NotChecked=0, Total=8190 [2018-12-03 18:55:59,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-12-03 18:55:59,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-12-03 18:55:59,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-12-03 18:55:59,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-12-03 18:55:59,505 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-12-03 18:55:59,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:55:59,505 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-12-03 18:55:59,505 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-12-03 18:55:59,505 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-12-03 18:55:59,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-12-03 18:55:59,506 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:55:59,506 INFO L402 BasicCegarLoop]: trace histogram [31, 1, 1, 1] [2018-12-03 18:55:59,507 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:55:59,507 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:55:59,507 INFO L82 PathProgramCache]: Analyzing trace with hash 1105768844, now seen corresponding path program 16 times [2018-12-03 18:55:59,507 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:55:59,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:59,508 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:55:59,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:55:59,508 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:55:59,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:56:00,302 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:00,303 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:00,303 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:56:00,303 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:56:00,303 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:56:00,303 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:00,303 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:56:00,313 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:56:00,314 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:56:00,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:56:00,381 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:56:00,438 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:00,439 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:56:02,141 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:02,159 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:56:02,159 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2018-12-03 18:56:02,160 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:56:02,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 18:56:02,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 18:56:02,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1556, Invalid=2734, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 18:56:02,161 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 35 states. [2018-12-03 18:56:04,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:56:04,247 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-12-03 18:56:04,247 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 18:56:04,248 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 34 [2018-12-03 18:56:04,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:56:04,248 INFO L225 Difference]: With dead ends: 39 [2018-12-03 18:56:04,248 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 18:56:04,250 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=3540, Invalid=5772, Unknown=0, NotChecked=0, Total=9312 [2018-12-03 18:56:04,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 18:56:04,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-12-03 18:56:04,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 18:56:04,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-12-03 18:56:04,255 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-12-03 18:56:04,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:56:04,256 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-12-03 18:56:04,256 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 18:56:04,256 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-12-03 18:56:04,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-12-03 18:56:04,256 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:56:04,256 INFO L402 BasicCegarLoop]: trace histogram [33, 1, 1, 1] [2018-12-03 18:56:04,257 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:56:04,257 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:56:04,257 INFO L82 PathProgramCache]: Analyzing trace with hash 1786994796, now seen corresponding path program 17 times [2018-12-03 18:56:04,257 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:56:04,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:04,258 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:56:04,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:04,258 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:56:04,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:56:04,903 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:04,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:04,904 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:56:04,904 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:56:04,904 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:56:04,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:04,904 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:56:04,912 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:56:04,913 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:56:04,934 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-03 18:56:04,935 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:56:04,939 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:56:04,985 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:04,985 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:56:06,910 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:06,929 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:56:06,929 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-12-03 18:56:06,929 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:56:06,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-12-03 18:56:06,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-12-03 18:56:06,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1755, Invalid=3075, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 18:56:06,930 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 37 states. [2018-12-03 18:56:09,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:56:09,370 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2018-12-03 18:56:09,371 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 18:56:09,371 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 36 [2018-12-03 18:56:09,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:56:09,372 INFO L225 Difference]: With dead ends: 41 [2018-12-03 18:56:09,372 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 18:56:09,373 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3999, Invalid=6507, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 18:56:09,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 18:56:09,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-12-03 18:56:09,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 18:56:09,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-12-03 18:56:09,379 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-12-03 18:56:09,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:56:09,380 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-12-03 18:56:09,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-12-03 18:56:09,380 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-12-03 18:56:09,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 18:56:09,381 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:56:09,381 INFO L402 BasicCegarLoop]: trace histogram [35, 1, 1, 1] [2018-12-03 18:56:09,381 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:56:09,381 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:56:09,381 INFO L82 PathProgramCache]: Analyzing trace with hash -684861620, now seen corresponding path program 18 times [2018-12-03 18:56:09,381 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:56:09,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:09,382 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:56:09,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:09,382 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:56:09,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:56:10,143 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:10,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:10,144 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:56:10,144 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:56:10,144 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:56:10,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:10,144 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:56:10,153 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:56:10,153 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:56:10,209 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:56:10,210 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:56:10,235 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:56:10,302 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:10,302 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:56:12,542 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:12,564 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:56:12,564 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-12-03 18:56:12,564 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:56:12,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-12-03 18:56:12,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-12-03 18:56:12,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1966, Invalid=3436, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 18:56:12,566 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 39 states. [2018-12-03 18:56:15,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:56:15,203 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-12-03 18:56:15,205 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 18:56:15,205 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 38 [2018-12-03 18:56:15,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:56:15,206 INFO L225 Difference]: With dead ends: 43 [2018-12-03 18:56:15,206 INFO L226 Difference]: Without dead ends: 41 [2018-12-03 18:56:15,207 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 18:56:15,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-12-03 18:56:15,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-12-03 18:56:15,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-12-03 18:56:15,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-12-03 18:56:15,213 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-12-03 18:56:15,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:56:15,214 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-12-03 18:56:15,214 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-12-03 18:56:15,214 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-12-03 18:56:15,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-12-03 18:56:15,214 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:56:15,215 INFO L402 BasicCegarLoop]: trace histogram [37, 1, 1, 1] [2018-12-03 18:56:15,215 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:56:15,215 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:56:15,215 INFO L82 PathProgramCache]: Analyzing trace with hash -1021962708, now seen corresponding path program 19 times [2018-12-03 18:56:15,215 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:56:15,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:15,216 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:56:15,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:15,216 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:56:15,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:56:16,912 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:16,912 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:16,912 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:56:16,912 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:56:16,913 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:56:16,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:16,913 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:56:16,922 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:56:16,922 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:56:16,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:56:17,017 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:56:17,099 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:17,099 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:56:19,166 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:19,187 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:56:19,187 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2018-12-03 18:56:19,187 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:56:19,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 18:56:19,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 18:56:19,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2189, Invalid=3817, Unknown=0, NotChecked=0, Total=6006 [2018-12-03 18:56:19,189 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 41 states. [2018-12-03 18:56:22,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:56:22,237 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2018-12-03 18:56:22,237 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 18:56:22,237 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 40 [2018-12-03 18:56:22,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:56:22,238 INFO L225 Difference]: With dead ends: 45 [2018-12-03 18:56:22,238 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 18:56:22,239 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 741 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=5001, Invalid=8109, Unknown=0, NotChecked=0, Total=13110 [2018-12-03 18:56:22,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 18:56:22,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-12-03 18:56:22,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-12-03 18:56:22,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-12-03 18:56:22,245 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2018-12-03 18:56:22,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:56:22,246 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-12-03 18:56:22,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 18:56:22,246 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-12-03 18:56:22,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 18:56:22,246 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:56:22,246 INFO L402 BasicCegarLoop]: trace histogram [39, 1, 1, 1] [2018-12-03 18:56:22,247 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:56:22,247 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:56:22,247 INFO L82 PathProgramCache]: Analyzing trace with hash 1441406220, now seen corresponding path program 20 times [2018-12-03 18:56:22,247 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:56:22,247 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:22,248 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:56:22,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:22,248 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:56:22,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:56:23,200 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:23,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:23,201 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:56:23,201 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:56:23,201 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:56:23,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:23,201 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:56:23,209 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:56:23,210 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:56:23,236 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-12-03 18:56:23,237 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:56:23,241 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:56:23,298 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:23,298 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:56:25,685 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:25,703 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:56:25,704 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-12-03 18:56:25,704 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:56:25,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-12-03 18:56:25,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-12-03 18:56:25,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2424, Invalid=4218, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 18:56:25,705 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 43 states. [2018-12-03 18:56:29,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:56:29,113 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2018-12-03 18:56:29,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 18:56:29,113 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 42 [2018-12-03 18:56:29,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:56:29,114 INFO L225 Difference]: With dead ends: 47 [2018-12-03 18:56:29,114 INFO L226 Difference]: Without dead ends: 45 [2018-12-03 18:56:29,116 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 18:56:29,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-12-03 18:56:29,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-12-03 18:56:29,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 18:56:29,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-12-03 18:56:29,122 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2018-12-03 18:56:29,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:56:29,122 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-12-03 18:56:29,122 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-12-03 18:56:29,122 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-12-03 18:56:29,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 18:56:29,123 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:56:29,123 INFO L402 BasicCegarLoop]: trace histogram [41, 1, 1, 1] [2018-12-03 18:56:29,123 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:56:29,123 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:56:29,124 INFO L82 PathProgramCache]: Analyzing trace with hash -2083001364, now seen corresponding path program 21 times [2018-12-03 18:56:29,124 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:56:29,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:29,125 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:56:29,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:29,125 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:56:29,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:56:30,199 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:30,200 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:30,200 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:56:30,200 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:56:30,200 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:56:30,200 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:30,201 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:56:30,209 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:56:30,209 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:56:30,285 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:56:30,285 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:56:30,324 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:56:30,395 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:30,395 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:56:33,191 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:33,210 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:56:33,211 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-12-03 18:56:33,211 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:56:33,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 18:56:33,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 18:56:33,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2671, Invalid=4639, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 18:56:33,212 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 45 states. [2018-12-03 18:56:37,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:56:37,133 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-12-03 18:56:37,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 18:56:37,136 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 44 [2018-12-03 18:56:37,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:56:37,137 INFO L225 Difference]: With dead ends: 49 [2018-12-03 18:56:37,137 INFO L226 Difference]: Without dead ends: 47 [2018-12-03 18:56:37,138 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 903 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=6115, Invalid=9887, Unknown=0, NotChecked=0, Total=16002 [2018-12-03 18:56:37,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-12-03 18:56:37,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-12-03 18:56:37,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-12-03 18:56:37,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-12-03 18:56:37,143 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2018-12-03 18:56:37,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:56:37,144 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-12-03 18:56:37,144 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 18:56:37,144 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-12-03 18:56:37,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-12-03 18:56:37,145 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:56:37,145 INFO L402 BasicCegarLoop]: trace histogram [43, 1, 1, 1] [2018-12-03 18:56:37,145 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:56:37,145 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:56:37,145 INFO L82 PathProgramCache]: Analyzing trace with hash -309493044, now seen corresponding path program 22 times [2018-12-03 18:56:37,145 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:56:37,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:37,146 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:56:37,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:37,146 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:56:37,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:56:38,225 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:38,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:38,226 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:56:38,226 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:56:38,226 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:56:38,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:38,226 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:56:38,234 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:56:38,235 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:56:38,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:56:38,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:56:38,452 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:38,452 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:56:41,074 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:41,092 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:56:41,093 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 89 [2018-12-03 18:56:41,093 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:56:41,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 18:56:41,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 18:56:41,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2930, Invalid=5080, Unknown=0, NotChecked=0, Total=8010 [2018-12-03 18:56:41,094 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 47 states. [2018-12-03 18:56:45,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:56:45,301 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2018-12-03 18:56:45,302 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 18:56:45,302 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 46 [2018-12-03 18:56:45,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:56:45,303 INFO L225 Difference]: With dead ends: 51 [2018-12-03 18:56:45,303 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 18:56:45,304 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 18:56:45,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 18:56:45,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-12-03 18:56:45,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 18:56:45,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-12-03 18:56:45,309 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2018-12-03 18:56:45,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:56:45,309 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-12-03 18:56:45,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 18:56:45,309 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-12-03 18:56:45,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 18:56:45,309 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:56:45,309 INFO L402 BasicCegarLoop]: trace histogram [45, 1, 1, 1] [2018-12-03 18:56:45,310 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:56:45,310 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:56:45,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1070014036, now seen corresponding path program 23 times [2018-12-03 18:56:45,310 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:56:45,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:45,311 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:56:45,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:45,311 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:56:45,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:56:46,534 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:46,535 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:46,535 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:56:46,535 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:56:46,535 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:56:46,535 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:46,535 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:56:46,545 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:56:46,545 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:56:46,608 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 18:56:46,608 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:56:46,613 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:56:46,955 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:46,955 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:56:49,901 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:49,921 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:56:49,921 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-12-03 18:56:49,922 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:56:49,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-12-03 18:56:49,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-12-03 18:56:49,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3201, Invalid=5541, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 18:56:49,923 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 49 states. [2018-12-03 18:56:54,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:56:54,573 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2018-12-03 18:56:54,574 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-12-03 18:56:54,574 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 48 [2018-12-03 18:56:54,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:56:54,575 INFO L225 Difference]: With dead ends: 53 [2018-12-03 18:56:54,575 INFO L226 Difference]: Without dead ends: 51 [2018-12-03 18:56:54,577 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 18:56:54,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-12-03 18:56:54,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-12-03 18:56:54,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 18:56:54,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-12-03 18:56:54,585 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2018-12-03 18:56:54,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:56:54,585 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-12-03 18:56:54,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-12-03 18:56:54,585 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-12-03 18:56:54,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 18:56:54,586 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:56:54,586 INFO L402 BasicCegarLoop]: trace histogram [47, 1, 1, 1] [2018-12-03 18:56:54,586 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:56:54,586 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:56:54,586 INFO L82 PathProgramCache]: Analyzing trace with hash -1786247028, now seen corresponding path program 24 times [2018-12-03 18:56:54,586 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:56:54,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:54,587 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:56:54,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:56:54,587 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:56:54,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:56:55,914 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:55,914 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:55,914 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:56:55,914 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:56:55,915 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:56:55,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:56:55,915 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:56:55,924 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:56:55,924 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:56:56,032 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:56:56,033 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:56:56,088 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:56:56,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:56,171 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:56:59,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:56:59,554 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:56:59,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-12-03 18:56:59,554 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:56:59,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-12-03 18:56:59,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-12-03 18:56:59,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3484, Invalid=6022, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 18:56:59,556 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 51 states. [2018-12-03 18:56:59,787 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 9 [2018-12-03 18:57:04,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:57:04,731 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-12-03 18:57:04,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 18:57:04,731 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 50 [2018-12-03 18:57:04,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:57:04,732 INFO L225 Difference]: With dead ends: 55 [2018-12-03 18:57:04,732 INFO L226 Difference]: Without dead ends: 53 [2018-12-03 18:57:04,734 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1176 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=7996, Invalid=12884, Unknown=0, NotChecked=0, Total=20880 [2018-12-03 18:57:04,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-12-03 18:57:04,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-12-03 18:57:04,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-12-03 18:57:04,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-12-03 18:57:04,740 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2018-12-03 18:57:04,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:57:04,740 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-12-03 18:57:04,741 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-12-03 18:57:04,741 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-12-03 18:57:04,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-12-03 18:57:04,741 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:57:04,741 INFO L402 BasicCegarLoop]: trace histogram [49, 1, 1, 1] [2018-12-03 18:57:04,742 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:57:04,742 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:57:04,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1403582316, now seen corresponding path program 25 times [2018-12-03 18:57:04,742 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:57:04,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:57:04,743 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:57:04,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:57:04,743 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:57:04,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:57:06,056 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:06,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:57:06,057 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:57:06,057 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:57:06,057 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:57:06,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:57:06,057 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:57:06,066 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:57:06,066 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:57:06,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:57:06,255 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:57:06,353 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:06,353 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:57:10,073 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:10,092 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:57:10,092 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 101 [2018-12-03 18:57:10,093 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:57:10,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 18:57:10,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 18:57:10,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3779, Invalid=6523, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 18:57:10,094 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 53 states. [2018-12-03 18:57:10,256 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 8 [2018-12-03 18:57:10,382 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 9 [2018-12-03 18:57:10,510 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:57:10,758 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 18:57:15,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:57:15,786 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2018-12-03 18:57:15,786 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 18:57:15,786 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 52 [2018-12-03 18:57:15,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:57:15,787 INFO L225 Difference]: With dead ends: 57 [2018-12-03 18:57:15,787 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 18:57:15,788 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1275 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=8679, Invalid=13971, Unknown=0, NotChecked=0, Total=22650 [2018-12-03 18:57:15,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 18:57:15,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-12-03 18:57:15,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-03 18:57:15,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-12-03 18:57:15,794 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2018-12-03 18:57:15,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:57:15,794 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-12-03 18:57:15,794 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 18:57:15,794 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-12-03 18:57:15,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 18:57:15,795 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:57:15,795 INFO L402 BasicCegarLoop]: trace histogram [51, 1, 1, 1] [2018-12-03 18:57:15,795 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:57:15,796 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:57:15,796 INFO L82 PathProgramCache]: Analyzing trace with hash 222932556, now seen corresponding path program 26 times [2018-12-03 18:57:15,796 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:57:15,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:57:15,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:57:15,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:57:15,797 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:57:16,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:57:17,957 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:17,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:57:17,957 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:57:17,957 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:57:17,958 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:57:17,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:57:17,958 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:57:17,968 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:57:17,969 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:57:18,007 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-12-03 18:57:18,007 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:57:18,011 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:57:18,098 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:18,098 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:57:21,759 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:21,779 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:57:21,779 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-12-03 18:57:21,779 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:57:21,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 18:57:21,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 18:57:21,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4086, Invalid=7044, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 18:57:21,781 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 55 states. [2018-12-03 18:57:21,910 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 8 [2018-12-03 18:57:22,035 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 9 [2018-12-03 18:57:22,165 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:57:22,293 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:57:22,437 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:57:22,577 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:57:22,719 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 18:57:22,871 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 18:57:28,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:57:28,163 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2018-12-03 18:57:28,163 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 18:57:28,163 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 54 [2018-12-03 18:57:28,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:57:28,164 INFO L225 Difference]: With dead ends: 59 [2018-12-03 18:57:28,164 INFO L226 Difference]: Without dead ends: 57 [2018-12-03 18:57:28,166 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1378 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=9390, Invalid=15102, Unknown=0, NotChecked=0, Total=24492 [2018-12-03 18:57:28,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-12-03 18:57:28,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-12-03 18:57:28,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-03 18:57:28,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-12-03 18:57:28,171 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2018-12-03 18:57:28,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:57:28,172 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-12-03 18:57:28,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 18:57:28,172 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-12-03 18:57:28,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-12-03 18:57:28,172 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:57:28,173 INFO L402 BasicCegarLoop]: trace histogram [53, 1, 1, 1] [2018-12-03 18:57:28,173 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:57:28,173 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:57:28,173 INFO L82 PathProgramCache]: Analyzing trace with hash -510120660, now seen corresponding path program 27 times [2018-12-03 18:57:28,173 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:57:28,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:57:28,174 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:57:28,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:57:28,174 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:57:28,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:57:29,803 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:29,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:57:29,803 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:57:29,803 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:57:29,803 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:57:29,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:57:29,803 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:57:29,812 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:57:29,813 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:57:29,963 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:57:29,963 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:57:30,045 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:57:30,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:30,135 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:57:34,343 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:34,362 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:57:34,363 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 109 [2018-12-03 18:57:34,363 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:57:34,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-12-03 18:57:34,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-12-03 18:57:34,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4405, Invalid=7585, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 18:57:34,364 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 57 states. [2018-12-03 18:57:34,504 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-12-03 18:57:34,635 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-12-03 18:57:34,778 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:57:34,909 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:57:35,052 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:57:35,187 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:57:35,327 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:57:35,606 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 18:57:35,754 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 18:57:41,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:57:41,093 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-12-03 18:57:41,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 18:57:41,094 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 56 [2018-12-03 18:57:41,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:57:41,094 INFO L225 Difference]: With dead ends: 61 [2018-12-03 18:57:41,094 INFO L226 Difference]: Without dead ends: 59 [2018-12-03 18:57:41,096 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1485 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=10129, Invalid=16277, Unknown=0, NotChecked=0, Total=26406 [2018-12-03 18:57:41,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-12-03 18:57:41,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-12-03 18:57:41,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-12-03 18:57:41,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-12-03 18:57:41,101 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2018-12-03 18:57:41,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:57:41,101 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-12-03 18:57:41,101 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-12-03 18:57:41,101 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-12-03 18:57:41,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-12-03 18:57:41,102 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:57:41,102 INFO L402 BasicCegarLoop]: trace histogram [55, 1, 1, 1] [2018-12-03 18:57:41,102 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:57:41,102 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:57:41,102 INFO L82 PathProgramCache]: Analyzing trace with hash -599624692, now seen corresponding path program 28 times [2018-12-03 18:57:41,103 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:57:41,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:57:41,103 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:57:41,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:57:41,104 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:57:41,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:57:42,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:42,996 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:57:42,996 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:57:42,996 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:57:42,996 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:57:42,996 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:57:42,996 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:57:43,006 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:57:43,006 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:57:43,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:57:43,261 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:57:43,389 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:43,389 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:57:47,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:47,663 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:57:47,663 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 113 [2018-12-03 18:57:47,663 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:57:47,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 18:57:47,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 18:57:47,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4736, Invalid=8146, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 18:57:47,665 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 59 states. [2018-12-03 18:57:47,817 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-12-03 18:57:47,953 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 9 [2018-12-03 18:57:48,122 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:57:48,296 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:57:48,464 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:57:48,627 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:57:48,769 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:57:48,919 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:57:49,067 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:57:49,222 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:57:55,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:57:55,170 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-12-03 18:57:55,171 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 18:57:55,171 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 58 [2018-12-03 18:57:55,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:57:55,172 INFO L225 Difference]: With dead ends: 63 [2018-12-03 18:57:55,172 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 18:57:55,173 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1596 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=10896, Invalid=17496, Unknown=0, NotChecked=0, Total=28392 [2018-12-03 18:57:55,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 18:57:55,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-12-03 18:57:55,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-12-03 18:57:55,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-12-03 18:57:55,178 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2018-12-03 18:57:55,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:57:55,178 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-12-03 18:57:55,178 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 18:57:55,178 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-12-03 18:57:55,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-12-03 18:57:55,178 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:57:55,178 INFO L402 BasicCegarLoop]: trace histogram [57, 1, 1, 1] [2018-12-03 18:57:55,179 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:57:55,179 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:57:55,179 INFO L82 PathProgramCache]: Analyzing trace with hash -713653524, now seen corresponding path program 29 times [2018-12-03 18:57:55,179 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:57:55,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:57:55,180 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:57:55,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:57:55,180 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:57:55,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:57:57,040 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:57,040 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:57:57,040 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:57:57,040 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:57:57,040 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:57:57,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:57:57,041 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:57:57,049 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:57:57,049 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:57:57,096 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-03 18:57:57,097 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:57:57,101 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:57:57,194 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:57:57,194 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:58:01,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:58:01,945 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:58:01,946 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 117 [2018-12-03 18:58:01,946 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:58:01,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-12-03 18:58:01,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-12-03 18:58:01,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5079, Invalid=8727, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 18:58:01,947 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 61 states. [2018-12-03 18:58:02,112 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 8 [2018-12-03 18:58:02,263 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 9 [2018-12-03 18:58:02,417 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:58:02,566 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:58:02,719 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:58:02,871 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:58:03,026 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:58:03,176 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:58:03,326 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:58:03,484 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:58:03,666 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:58:03,840 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:58:04,333 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 18:58:10,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:58:10,168 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2018-12-03 18:58:10,168 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-12-03 18:58:10,168 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 60 [2018-12-03 18:58:10,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:58:10,169 INFO L225 Difference]: With dead ends: 65 [2018-12-03 18:58:10,169 INFO L226 Difference]: Without dead ends: 63 [2018-12-03 18:58:10,172 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1711 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=11691, Invalid=18759, Unknown=0, NotChecked=0, Total=30450 [2018-12-03 18:58:10,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-12-03 18:58:10,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-12-03 18:58:10,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 18:58:10,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-12-03 18:58:10,177 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2018-12-03 18:58:10,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:58:10,178 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-12-03 18:58:10,178 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-12-03 18:58:10,178 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-12-03 18:58:10,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 18:58:10,178 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:58:10,179 INFO L402 BasicCegarLoop]: trace histogram [59, 1, 1, 1] [2018-12-03 18:58:10,179 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:58:10,179 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:58:10,179 INFO L82 PathProgramCache]: Analyzing trace with hash 1373788620, now seen corresponding path program 30 times [2018-12-03 18:58:10,179 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:58:10,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:58:10,180 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:58:10,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:58:10,180 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:58:10,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:58:12,153 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:58:12,153 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:58:12,153 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:58:12,153 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:58:12,153 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:58:12,153 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:58:12,153 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:58:12,163 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:58:12,164 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:58:12,359 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:58:12,359 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:58:12,474 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:58:12,685 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:58:12,685 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:58:17,690 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:58:17,709 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:58:17,709 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 121 [2018-12-03 18:58:17,709 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:58:17,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 18:58:17,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 18:58:17,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5434, Invalid=9328, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 18:58:17,710 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 63 states. [2018-12-03 18:58:17,876 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-12-03 18:58:18,027 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-12-03 18:58:18,188 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:58:18,356 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:58:18,520 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:58:18,676 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:58:18,839 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:58:19,015 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:58:19,197 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:58:19,373 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:58:19,540 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:58:19,704 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:58:19,864 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:58:20,032 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:58:20,205 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 18:58:20,567 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 18:58:26,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:58:26,432 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-12-03 18:58:26,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 18:58:26,433 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 62 [2018-12-03 18:58:26,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:58:26,434 INFO L225 Difference]: With dead ends: 67 [2018-12-03 18:58:26,434 INFO L226 Difference]: Without dead ends: 65 [2018-12-03 18:58:26,435 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1830 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=12514, Invalid=20066, Unknown=0, NotChecked=0, Total=32580 [2018-12-03 18:58:26,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-12-03 18:58:26,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2018-12-03 18:58:26,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-12-03 18:58:26,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-12-03 18:58:26,440 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2018-12-03 18:58:26,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:58:26,440 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-12-03 18:58:26,440 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 18:58:26,440 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-12-03 18:58:26,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-12-03 18:58:26,440 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:58:26,440 INFO L402 BasicCegarLoop]: trace histogram [61, 1, 1, 1] [2018-12-03 18:58:26,441 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:58:26,441 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:58:26,441 INFO L82 PathProgramCache]: Analyzing trace with hash 1655961772, now seen corresponding path program 31 times [2018-12-03 18:58:26,441 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:58:26,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:58:26,442 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:58:26,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:58:26,442 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:58:26,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:58:28,444 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:58:28,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:58:28,445 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:58:28,445 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:58:28,445 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:58:28,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:58:28,445 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:58:28,458 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:58:28,459 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:58:28,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:58:28,789 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:58:28,883 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:58:28,884 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:58:34,435 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:58:34,454 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:58:34,454 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 125 [2018-12-03 18:58:34,454 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:58:34,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 18:58:34,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 18:58:34,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5801, Invalid=9949, Unknown=0, NotChecked=0, Total=15750 [2018-12-03 18:58:34,456 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 65 states. [2018-12-03 18:58:34,678 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-12-03 18:58:34,841 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 9 [2018-12-03 18:58:35,006 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:58:35,168 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:58:35,343 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:58:35,504 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:58:35,671 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:58:35,854 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:58:36,032 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:58:36,201 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:58:36,373 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:58:36,543 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:58:36,715 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:58:36,883 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:58:37,069 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:58:37,252 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:58:43,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:58:43,897 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-12-03 18:58:43,897 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 18:58:43,897 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 64 [2018-12-03 18:58:43,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:58:43,898 INFO L225 Difference]: With dead ends: 69 [2018-12-03 18:58:43,898 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 18:58:43,900 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1953 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=13365, Invalid=21417, Unknown=0, NotChecked=0, Total=34782 [2018-12-03 18:58:43,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 18:58:43,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-12-03 18:58:43,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-12-03 18:58:43,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2018-12-03 18:58:43,906 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2018-12-03 18:58:43,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:58:43,906 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2018-12-03 18:58:43,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 18:58:43,906 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2018-12-03 18:58:43,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-12-03 18:58:43,907 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:58:43,907 INFO L402 BasicCegarLoop]: trace histogram [63, 1, 1, 1] [2018-12-03 18:58:43,907 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:58:43,907 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:58:43,908 INFO L82 PathProgramCache]: Analyzing trace with hash -2053546100, now seen corresponding path program 32 times [2018-12-03 18:58:43,908 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:58:43,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:58:43,909 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:58:43,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:58:43,909 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:58:44,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:58:46,375 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:58:46,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:58:46,376 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:58:46,376 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:58:46,376 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:58:46,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:58:46,376 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:58:46,384 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:58:46,384 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:58:46,442 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-12-03 18:58:46,442 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:58:46,447 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:58:46,544 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:58:46,544 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:58:52,341 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:58:52,360 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:58:52,360 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 129 [2018-12-03 18:58:52,361 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:58:52,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-12-03 18:58:52,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-12-03 18:58:52,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6180, Invalid=10590, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 18:58:52,362 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 67 states. [2018-12-03 18:58:52,544 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 8 [2018-12-03 18:58:52,724 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 9 [2018-12-03 18:58:52,902 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:58:53,083 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:58:53,263 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:58:53,444 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:58:53,617 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:58:53,789 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:58:53,972 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:58:54,156 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:58:54,332 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:58:54,522 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:58:54,704 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:58:54,900 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:58:55,091 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:58:55,273 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:58:55,832 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 18:59:02,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:59:02,561 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2018-12-03 18:59:02,561 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 18:59:02,561 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 66 [2018-12-03 18:59:02,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:59:02,562 INFO L225 Difference]: With dead ends: 71 [2018-12-03 18:59:02,562 INFO L226 Difference]: Without dead ends: 69 [2018-12-03 18:59:02,564 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 18:59:02,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-12-03 18:59:02,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-12-03 18:59:02,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-03 18:59:02,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-12-03 18:59:02,569 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2018-12-03 18:59:02,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:59:02,570 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-12-03 18:59:02,570 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-12-03 18:59:02,570 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-12-03 18:59:02,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-12-03 18:59:02,570 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:59:02,571 INFO L402 BasicCegarLoop]: trace histogram [65, 1, 1, 1] [2018-12-03 18:59:02,571 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:59:02,571 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:59:02,571 INFO L82 PathProgramCache]: Analyzing trace with hash -2067755412, now seen corresponding path program 33 times [2018-12-03 18:59:02,571 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:59:02,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:59:02,572 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:59:02,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:59:02,572 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:59:02,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:59:04,899 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:59:04,899 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:59:04,899 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:59:04,899 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:59:04,899 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:59:04,899 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:59:04,899 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:59:04,909 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:59:04,909 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:59:05,169 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:59:05,169 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:59:05,315 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:59:05,420 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:59:05,420 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:59:11,640 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:59:11,658 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:59:11,659 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 133 [2018-12-03 18:59:11,659 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:59:11,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-12-03 18:59:11,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-12-03 18:59:11,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6571, Invalid=11251, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 18:59:11,660 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 69 states. [2018-12-03 18:59:11,847 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-12-03 18:59:12,036 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-12-03 18:59:12,226 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:59:12,407 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:59:12,595 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:59:12,793 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:59:12,978 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:59:13,165 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:59:13,360 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:59:13,555 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:59:13,749 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:59:13,942 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:59:14,125 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:59:14,316 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:59:14,510 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:59:14,706 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:59:14,898 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:59:15,098 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:59:15,305 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:59:15,516 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:59:22,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:59:22,648 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-12-03 18:59:22,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 18:59:22,649 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 68 [2018-12-03 18:59:22,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:59:22,650 INFO L225 Difference]: With dead ends: 73 [2018-12-03 18:59:22,650 INFO L226 Difference]: Without dead ends: 71 [2018-12-03 18:59:22,651 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2211 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=15151, Invalid=24251, Unknown=0, NotChecked=0, Total=39402 [2018-12-03 18:59:22,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-12-03 18:59:22,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2018-12-03 18:59:22,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-12-03 18:59:22,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-12-03 18:59:22,656 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2018-12-03 18:59:22,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:59:22,656 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-12-03 18:59:22,656 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-12-03 18:59:22,656 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-12-03 18:59:22,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-12-03 18:59:22,657 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:59:22,657 INFO L402 BasicCegarLoop]: trace histogram [67, 1, 1, 1] [2018-12-03 18:59:22,657 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:59:22,657 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:59:22,658 INFO L82 PathProgramCache]: Analyzing trace with hash 1456964940, now seen corresponding path program 34 times [2018-12-03 18:59:22,658 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:59:22,658 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:59:22,658 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:59:22,658 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:59:22,659 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:59:22,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:59:26,131 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:59:26,131 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:59:26,132 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:59:26,132 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:59:26,132 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:59:26,132 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:59:26,132 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:59:26,141 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:59:26,141 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:59:26,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:59:26,563 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:59:26,654 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:59:26,654 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:59:33,468 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:59:33,496 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:59:33,497 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 137 [2018-12-03 18:59:33,497 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:59:33,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 18:59:33,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 18:59:33,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6974, Invalid=11932, Unknown=0, NotChecked=0, Total=18906 [2018-12-03 18:59:33,498 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 71 states. [2018-12-03 18:59:33,692 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-12-03 18:59:33,879 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 9 [2018-12-03 18:59:34,072 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:59:34,268 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:59:34,473 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:59:34,662 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:59:34,855 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:59:35,048 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:59:35,251 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:59:35,453 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:59:35,668 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:59:35,871 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:59:36,086 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:59:36,282 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:59:36,486 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:59:36,701 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:59:36,902 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:59:37,110 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:59:37,312 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:59:37,520 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 18:59:37,734 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 18:59:37,939 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 18:59:45,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:59:45,294 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2018-12-03 18:59:45,294 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 18:59:45,294 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 70 [2018-12-03 18:59:45,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:59:45,295 INFO L225 Difference]: With dead ends: 75 [2018-12-03 18:59:45,295 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 18:59:45,297 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2346 ImplicationChecksByTransitivity, 21.5s TimeCoverageRelationStatistics Valid=16086, Invalid=25734, Unknown=0, NotChecked=0, Total=41820 [2018-12-03 18:59:45,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 18:59:45,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2018-12-03 18:59:45,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 18:59:45,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2018-12-03 18:59:45,302 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2018-12-03 18:59:45,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:59:45,303 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2018-12-03 18:59:45,303 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 18:59:45,303 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2018-12-03 18:59:45,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 18:59:45,304 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:59:45,304 INFO L402 BasicCegarLoop]: trace histogram [69, 1, 1, 1] [2018-12-03 18:59:45,304 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:59:45,304 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:59:45,304 INFO L82 PathProgramCache]: Analyzing trace with hash -15973332, now seen corresponding path program 35 times [2018-12-03 18:59:45,304 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:59:45,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:59:45,305 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:59:45,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:59:45,305 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:59:45,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:59:48,288 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:59:48,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:59:48,289 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:59:48,289 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:59:48,289 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:59:48,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:59:48,289 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:59:48,298 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:59:48,298 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:59:48,347 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-12-03 18:59:48,347 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:59:48,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:59:48,455 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:59:48,455 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:59:55,193 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:59:55,212 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:59:55,212 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 141 [2018-12-03 18:59:55,212 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:59:55,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-12-03 18:59:55,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-12-03 18:59:55,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7389, Invalid=12633, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 18:59:55,213 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 73 states. [2018-12-03 18:59:55,417 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 8 [2018-12-03 18:59:55,610 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 9 [2018-12-03 18:59:55,812 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 18:59:56,014 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 18:59:56,232 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 18:59:56,445 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 18:59:56,647 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 18:59:56,849 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 18:59:57,061 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 18:59:57,266 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 18:59:57,476 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 18:59:57,686 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 18:59:57,910 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 18:59:58,119 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 18:59:58,341 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 18:59:58,554 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 18:59:58,764 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 18:59:58,978 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 18:59:59,190 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 18:59:59,410 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 18:59:59,629 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 18:59:59,848 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 19:00:00,063 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 19:00:00,479 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 19:00:07,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:00:07,984 INFO L93 Difference]: Finished difference Result 77 states and 78 transitions. [2018-12-03 19:00:07,984 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 19:00:07,985 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 72 [2018-12-03 19:00:07,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:00:07,986 INFO L225 Difference]: With dead ends: 77 [2018-12-03 19:00:07,986 INFO L226 Difference]: Without dead ends: 75 [2018-12-03 19:00:07,988 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2485 ImplicationChecksByTransitivity, 21.9s TimeCoverageRelationStatistics Valid=17049, Invalid=27261, Unknown=0, NotChecked=0, Total=44310 [2018-12-03 19:00:07,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-03 19:00:07,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-12-03 19:00:07,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-03 19:00:07,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-12-03 19:00:07,992 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2018-12-03 19:00:07,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:00:07,993 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-12-03 19:00:07,993 INFO L481 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-12-03 19:00:07,993 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-12-03 19:00:07,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-12-03 19:00:07,993 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:00:07,993 INFO L402 BasicCegarLoop]: trace histogram [71, 1, 1, 1] [2018-12-03 19:00:07,994 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:00:07,994 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:00:07,994 INFO L82 PathProgramCache]: Analyzing trace with hash 1829554956, now seen corresponding path program 36 times [2018-12-03 19:00:07,994 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:00:07,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:00:07,995 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:00:07,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:00:07,995 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:00:08,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:00:11,016 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 19:00:11,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:00:11,017 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:00:11,017 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:00:11,017 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:00:11,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:00:11,017 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:00:11,026 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:00:11,026 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:00:11,340 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:00:11,340 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:00:11,525 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:00:11,733 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 19:00:11,733 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:00:19,134 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 19:00:19,153 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:00:19,154 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 145 [2018-12-03 19:00:19,154 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:00:19,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-03 19:00:19,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-03 19:00:19,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7816, Invalid=13354, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 19:00:19,155 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 75 states. [2018-12-03 19:00:19,430 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-12-03 19:00:19,637 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-12-03 19:00:19,851 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 19:00:20,070 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 19:00:20,282 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 19:00:20,492 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 19:00:20,699 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 19:00:20,910 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 19:00:21,137 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 19:00:21,358 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 19:00:21,577 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 19:00:21,804 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 19:00:22,042 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 19:00:22,272 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 19:00:22,503 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 19:00:22,728 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 19:00:22,953 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 19:00:23,183 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 19:00:23,405 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 19:00:23,636 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 19:00:23,873 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 19:00:24,099 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 19:00:24,323 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 19:00:24,548 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 19:00:24,773 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 19:00:24,991 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 19:00:33,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:00:33,154 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-12-03 19:00:33,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 19:00:33,154 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 74 [2018-12-03 19:00:33,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:00:33,155 INFO L225 Difference]: With dead ends: 79 [2018-12-03 19:00:33,155 INFO L226 Difference]: Without dead ends: 77 [2018-12-03 19:00:33,157 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 19:00:33,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-12-03 19:00:33,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-12-03 19:00:33,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-12-03 19:00:33,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-12-03 19:00:33,163 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2018-12-03 19:00:33,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:00:33,164 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-12-03 19:00:33,164 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-03 19:00:33,164 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-12-03 19:00:33,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-12-03 19:00:33,165 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:00:33,167 INFO L402 BasicCegarLoop]: trace histogram [73, 1, 1, 1] [2018-12-03 19:00:33,167 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:00:33,167 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:00:33,167 INFO L82 PathProgramCache]: Analyzing trace with hash 1560746476, now seen corresponding path program 37 times [2018-12-03 19:00:33,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:00:33,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:00:33,168 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:00:33,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:00:33,169 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:00:33,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:00:36,166 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 19:00:36,167 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:00:36,167 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:00:36,167 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:00:36,167 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:00:36,167 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:00:36,167 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:00:36,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:00:36,196 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:00:36,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:00:36,752 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:00:36,885 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 19:00:36,885 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:00:44,724 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 19:00:44,743 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:00:44,743 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 149 [2018-12-03 19:00:44,743 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:00:44,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 19:00:44,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 19:00:44,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8255, Invalid=14095, Unknown=0, NotChecked=0, Total=22350 [2018-12-03 19:00:44,745 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 77 states. [2018-12-03 19:00:44,965 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2018-12-03 19:00:45,188 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 9 [2018-12-03 19:00:45,410 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 19:00:45,627 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 19:00:45,849 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 19:00:46,066 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 19:00:46,283 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 19:00:46,506 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 19:00:46,734 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 19:00:46,964 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 19:00:47,187 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 19:00:47,445 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 19:00:47,690 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 19:00:47,915 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 19:00:48,148 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 19:00:48,387 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 19:00:48,618 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 19:00:48,858 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 19:00:49,091 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 19:00:49,335 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 19:00:49,579 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 19:00:49,830 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 19:00:50,061 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 19:00:50,298 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 19:00:50,535 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 19:00:50,774 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 19:00:51,008 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 19:00:59,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:00:59,520 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2018-12-03 19:00:59,520 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 19:00:59,520 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 76 [2018-12-03 19:00:59,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:00:59,521 INFO L225 Difference]: With dead ends: 81 [2018-12-03 19:00:59,521 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 19:00:59,522 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 221 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2775 ImplicationChecksByTransitivity, 24.9s TimeCoverageRelationStatistics Valid=19059, Invalid=30447, Unknown=0, NotChecked=0, Total=49506 [2018-12-03 19:00:59,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 19:00:59,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-12-03 19:00:59,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-12-03 19:00:59,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-12-03 19:00:59,527 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2018-12-03 19:00:59,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:00:59,527 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-12-03 19:00:59,527 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 19:00:59,527 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-12-03 19:00:59,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-12-03 19:00:59,528 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:00:59,528 INFO L402 BasicCegarLoop]: trace histogram [75, 1, 1, 1] [2018-12-03 19:00:59,528 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:00:59,528 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:00:59,528 INFO L82 PathProgramCache]: Analyzing trace with hash 933834956, now seen corresponding path program 38 times [2018-12-03 19:00:59,529 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:00:59,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:00:59,529 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:00:59,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:00:59,530 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:00:59,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:01:03,063 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 19:01:03,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:01:03,064 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:01:03,064 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:01:03,064 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:01:03,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:01:03,065 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:01:03,084 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:01:03,084 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:01:03,212 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-12-03 19:01:03,212 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:01:03,218 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:01:03,323 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 19:01:03,323 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:01:11,403 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 19:01:11,424 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:01:11,424 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 153 [2018-12-03 19:01:11,424 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:01:11,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-12-03 19:01:11,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-12-03 19:01:11,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8706, Invalid=14856, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 19:01:11,425 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 79 states. [2018-12-03 19:01:11,698 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 8 [2018-12-03 19:01:11,924 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 9 [2018-12-03 19:01:12,150 WARN L180 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 19:01:12,385 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 19:01:12,614 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 19:01:12,839 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 19:01:13,081 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 19:01:13,329 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 19:01:13,575 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 19:01:13,813 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 19:01:14,057 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 19:01:14,301 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 19:01:14,541 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 19:01:14,774 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 19:01:15,035 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 19:01:15,284 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 19:01:15,529 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 19:01:15,785 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 19:01:16,029 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 19:01:16,285 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 19:01:16,538 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 19:01:16,785 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 19:01:17,030 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 19:01:17,274 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 19:01:17,532 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 19:01:17,782 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 19:01:18,027 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 19:01:18,303 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 19:01:18,556 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 19:01:27,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:01:27,213 INFO L93 Difference]: Finished difference Result 83 states and 84 transitions. [2018-12-03 19:01:27,213 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-12-03 19:01:27,214 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 78 [2018-12-03 19:01:27,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:01:27,215 INFO L225 Difference]: With dead ends: 83 [2018-12-03 19:01:27,215 INFO L226 Difference]: Without dead ends: 81 [2018-12-03 19:01:27,217 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2926 ImplicationChecksByTransitivity, 26.6s TimeCoverageRelationStatistics Valid=20106, Invalid=32106, Unknown=0, NotChecked=0, Total=52212 [2018-12-03 19:01:27,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-12-03 19:01:27,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-12-03 19:01:27,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-03 19:01:27,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-12-03 19:01:27,221 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2018-12-03 19:01:27,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:01:27,221 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-12-03 19:01:27,221 INFO L481 AbstractCegarLoop]: Interpolant automaton has 79 states. [2018-12-03 19:01:27,221 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-12-03 19:01:27,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-12-03 19:01:27,222 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:01:27,222 INFO L402 BasicCegarLoop]: trace histogram [77, 1, 1, 1] [2018-12-03 19:01:27,222 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:01:27,222 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:01:27,222 INFO L82 PathProgramCache]: Analyzing trace with hash -232714324, now seen corresponding path program 39 times [2018-12-03 19:01:27,222 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:01:27,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:01:27,223 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:01:27,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:01:27,223 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:01:27,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:01:30,921 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 19:01:30,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:01:30,922 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:01:30,922 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:01:30,922 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:01:30,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:01:30,922 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:01:30,932 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:01:30,933 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:01:31,321 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:01:31,322 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:01:31,561 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:01:31,677 INFO L134 CoverageAnalysis]: Checked inductivity of 3003 backedges. 0 proven. 3003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:01:31,678 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:01:40,275 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 19:01:40,294 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:01:40,294 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 157 [2018-12-03 19:01:40,294 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:01:40,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-12-03 19:01:40,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-12-03 19:01:40,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9169, Invalid=15637, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 19:01:40,296 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 81 states. [2018-12-03 19:01:40,536 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 8 [2018-12-03 19:01:40,773 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 9 [2018-12-03 19:01:41,010 WARN L180 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 19:01:41,249 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 19:01:41,496 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 19:01:41,729 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 19:01:41,970 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 19:01:42,211 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 19:01:42,473 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 19:01:42,723 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 19:01:42,978 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 19:01:43,230 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 19:01:43,484 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 19:01:43,745 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 19:01:44,025 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 19:01:44,289 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 19:01:44,546 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 19:01:44,801 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 19:01:45,066 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 19:01:45,330 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 19:01:45,601 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 19:01:45,861 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 19:01:46,139 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 19:01:46,402 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 19:01:46,661 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 19:01:46,918 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 19:01:47,178 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 19:01:47,442 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 19:01:47,702 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 19:01:47,955 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 19:01:48,213 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 19:01:49,006 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 19:01:57,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:01:57,177 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2018-12-03 19:01:57,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 19:01:57,178 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 80 [2018-12-03 19:01:57,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:01:57,179 INFO L225 Difference]: With dead ends: 85 [2018-12-03 19:01:57,179 INFO L226 Difference]: Without dead ends: 83 [2018-12-03 19:01:57,181 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 233 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3081 ImplicationChecksByTransitivity, 28.4s TimeCoverageRelationStatistics Valid=21181, Invalid=33809, Unknown=0, NotChecked=0, Total=54990 [2018-12-03 19:01:57,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-12-03 19:01:57,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2018-12-03 19:01:57,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-12-03 19:01:57,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-12-03 19:01:57,186 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2018-12-03 19:01:57,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:01:57,186 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-12-03 19:01:57,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-12-03 19:01:57,186 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-12-03 19:01:57,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-12-03 19:01:57,186 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:01:57,187 INFO L402 BasicCegarLoop]: trace histogram [79, 1, 1, 1] [2018-12-03 19:01:57,187 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:01:57,187 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:01:57,187 INFO L82 PathProgramCache]: Analyzing trace with hash -300108148, now seen corresponding path program 40 times [2018-12-03 19:01:57,187 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:01:57,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:01:57,188 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:01:57,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:01:57,188 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:01:57,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:02:00,801 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 19:02:00,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:02:00,802 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:02:00,802 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:02:00,802 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:02:00,802 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:02:00,802 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:02:00,811 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:02:00,811 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:02:01,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:02:01,484 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:02:01,599 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 19:02:01,599 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:02:10,669 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 19:02:10,689 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:02:10,689 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 161 [2018-12-03 19:02:10,690 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:02:10,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 19:02:10,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 19:02:10,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9644, Invalid=16438, Unknown=0, NotChecked=0, Total=26082 [2018-12-03 19:02:10,691 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 83 states. [2018-12-03 19:02:10,942 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 8 [2018-12-03 19:02:11,179 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 9 [2018-12-03 19:02:11,429 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 19:02:11,689 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 19:02:11,945 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 19:02:12,193 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 19:02:12,443 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 19:02:12,690 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 19:02:12,947 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 19:02:13,225 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 19:02:13,487 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 19:02:13,747 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 19:02:14,015 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 19:02:14,262 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 19:02:14,546 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 19:02:14,822 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 19:02:15,090 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 19:02:15,359 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 19:02:15,628 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 19:02:15,898 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 19:02:16,173 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 19:02:16,452 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 19:02:16,736 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 19:02:17,008 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 19:02:17,287 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 19:02:17,558 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 19:02:17,828 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 19:02:18,106 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 19:02:18,372 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 19:02:18,627 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 19:02:18,886 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 19:02:19,149 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 19:02:19,679 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 19:02:19,949 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 19:02:28,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:02:28,714 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2018-12-03 19:02:28,714 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 19:02:28,715 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 82 [2018-12-03 19:02:28,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:02:28,716 INFO L225 Difference]: With dead ends: 87 [2018-12-03 19:02:28,716 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 19:02:28,718 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3240 ImplicationChecksByTransitivity, 29.9s TimeCoverageRelationStatistics Valid=22284, Invalid=35556, Unknown=0, NotChecked=0, Total=57840 [2018-12-03 19:02:28,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 19:02:28,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2018-12-03 19:02:28,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-12-03 19:02:28,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2018-12-03 19:02:28,724 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2018-12-03 19:02:28,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:02:28,724 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2018-12-03 19:02:28,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 19:02:28,725 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2018-12-03 19:02:28,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-12-03 19:02:28,725 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:02:28,725 INFO L402 BasicCegarLoop]: trace histogram [81, 1, 1, 1] [2018-12-03 19:02:28,726 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:02:28,726 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:02:28,739 INFO L82 PathProgramCache]: Analyzing trace with hash -641063572, now seen corresponding path program 41 times [2018-12-03 19:02:28,740 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:02:28,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:02:28,741 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:02:28,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:02:28,741 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:02:29,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:02:32,621 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 19:02:32,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:02:32,622 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:02:32,622 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:02:32,622 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:02:32,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:02:32,622 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:02:32,632 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:02:32,632 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:02:32,698 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-12-03 19:02:32,698 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:02:32,704 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:02:32,816 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 19:02:32,817 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:02:42,426 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 19:02:42,446 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:02:42,446 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 165 [2018-12-03 19:02:42,446 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:02:42,447 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-12-03 19:02:42,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-12-03 19:02:42,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10131, Invalid=17259, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 19:02:42,448 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 85 states. [2018-12-03 19:02:42,714 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 8 [2018-12-03 19:02:42,970 WARN L180 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 9 [2018-12-03 19:02:43,250 WARN L180 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 19:02:43,512 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 19:02:43,777 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 19:02:44,046 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 19:02:44,311 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 19:02:44,578 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 19:02:44,867 WARN L180 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 19:02:45,145 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 19:02:45,446 WARN L180 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 19:02:45,726 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 19:02:45,994 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 19:02:46,271 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 19:02:46,563 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 19:02:46,859 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 19:02:47,135 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 19:02:47,423 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 19:02:47,705 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 19:02:47,995 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 19:02:48,288 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 19:02:48,586 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 19:02:48,872 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 19:02:49,155 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 19:02:49,431 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 19:02:49,725 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 19:02:50,023 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 19:02:50,320 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 19:02:50,633 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 19:02:50,927 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 19:02:51,204 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 19:02:51,484 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 19:02:51,760 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 19:02:52,034 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 19:02:53,109 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 19:03:01,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:03:01,903 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2018-12-03 19:03:01,904 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-12-03 19:03:01,904 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 84 [2018-12-03 19:03:01,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:03:01,905 INFO L225 Difference]: With dead ends: 89 [2018-12-03 19:03:01,905 INFO L226 Difference]: Without dead ends: 87 [2018-12-03 19:03:01,907 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3403 ImplicationChecksByTransitivity, 32.0s TimeCoverageRelationStatistics Valid=23415, Invalid=37347, Unknown=0, NotChecked=0, Total=60762 [2018-12-03 19:03:01,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-12-03 19:03:01,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-12-03 19:03:01,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 19:03:01,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-12-03 19:03:01,914 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2018-12-03 19:03:01,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:03:01,914 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-12-03 19:03:01,914 INFO L481 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-12-03 19:03:01,914 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-12-03 19:03:01,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 19:03:01,915 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:03:01,915 INFO L402 BasicCegarLoop]: trace histogram [83, 1, 1, 1] [2018-12-03 19:03:01,915 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:03:01,915 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:03:01,915 INFO L82 PathProgramCache]: Analyzing trace with hash -1881711540, now seen corresponding path program 42 times [2018-12-03 19:03:01,915 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:03:01,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:03:01,916 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:03:01,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:03:01,916 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:03:02,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:03:06,135 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 19:03:06,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:03:06,135 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:03:06,135 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:03:06,136 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:03:06,136 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:03:06,136 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:03:06,150 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:03:06,150 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:03:06,641 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:03:06,641 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:03:06,939 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:03:07,060 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 19:03:07,060 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:03:16,959 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 19:03:16,978 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:03:16,979 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 169 [2018-12-03 19:03:16,979 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:03:16,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-12-03 19:03:16,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-12-03 19:03:16,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10630, Invalid=18100, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 19:03:16,980 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 87 states. [2018-12-03 19:03:17,258 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 8 [2018-12-03 19:03:17,527 WARN L180 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 9 [2018-12-03 19:03:17,800 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 19:03:18,254 WARN L180 SmtUtils]: Spent 422.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 19:03:18,532 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 19:03:18,801 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 19:03:19,071 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 19:03:19,349 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 19:03:19,638 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 19:03:19,914 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 19:03:20,200 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 19:03:20,488 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 19:03:20,775 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 19:03:21,053 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 19:03:21,377 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 19:03:21,667 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 19:03:21,946 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 19:03:22,237 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 19:03:22,532 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 19:03:22,837 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 19:03:23,143 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 19:03:23,462 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 19:03:23,774 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 19:03:24,075 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 19:03:24,376 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 19:03:24,683 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 19:03:24,985 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 19:03:25,287 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 19:03:25,603 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 19:03:25,898 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 19:03:26,225 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 19:03:26,532 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 19:03:26,829 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 19:03:27,119 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 19:03:27,404 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 19:03:27,688 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 19:03:27,980 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 19:03:28,260 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 19:03:37,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:03:37,876 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2018-12-03 19:03:37,876 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 19:03:37,876 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 86 [2018-12-03 19:03:37,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:03:37,877 INFO L225 Difference]: With dead ends: 91 [2018-12-03 19:03:37,877 INFO L226 Difference]: Without dead ends: 89 [2018-12-03 19:03:37,879 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 251 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3570 ImplicationChecksByTransitivity, 34.1s TimeCoverageRelationStatistics Valid=24574, Invalid=39182, Unknown=0, NotChecked=0, Total=63756 [2018-12-03 19:03:37,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-12-03 19:03:37,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-12-03 19:03:37,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-12-03 19:03:37,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-12-03 19:03:37,885 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2018-12-03 19:03:37,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:03:37,885 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-12-03 19:03:37,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-12-03 19:03:37,885 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-12-03 19:03:37,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-12-03 19:03:37,886 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:03:37,886 INFO L402 BasicCegarLoop]: trace histogram [85, 1, 1, 1] [2018-12-03 19:03:37,886 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:03:37,886 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:03:37,887 INFO L82 PathProgramCache]: Analyzing trace with hash -143500500, now seen corresponding path program 43 times [2018-12-03 19:03:37,887 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:03:37,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:03:37,887 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:03:37,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:03:37,888 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:03:38,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:03:42,181 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 19:03:42,182 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:03:42,182 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:03:42,182 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:03:42,182 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:03:42,182 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:03:42,182 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:03:42,191 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:03:42,192 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:03:42,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:03:43,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:03:43,149 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 19:03:43,149 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:03:53,481 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 19:03:53,501 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:03:53,501 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 173 [2018-12-03 19:03:53,501 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:03:53,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 19:03:53,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 19:03:53,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11141, Invalid=18961, Unknown=0, NotChecked=0, Total=30102 [2018-12-03 19:03:53,502 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 89 states. [2018-12-03 19:03:53,783 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 8 [2018-12-03 19:03:54,060 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 9 [2018-12-03 19:03:54,348 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 19:03:54,633 WARN L180 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 19:03:54,933 WARN L180 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 19:03:55,224 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 19:03:55,513 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 19:03:55,796 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 19:03:56,096 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 19:03:56,398 WARN L180 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 19:03:56,696 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 19:03:57,008 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 19:03:57,316 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 19:03:57,602 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 19:03:57,924 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 19:03:58,238 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 19:03:58,542 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 19:03:58,856 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 19:03:59,167 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 19:03:59,480 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 19:03:59,785 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 19:04:00,093 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 19:04:00,395 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 19:04:00,694 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 19:04:01,011 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 19:04:01,343 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 19:04:01,655 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 19:04:01,990 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 19:04:02,301 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 19:04:02,611 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 19:04:02,945 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 19:04:03,315 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 19:04:03,665 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 19:04:03,971 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 19:04:04,273 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 19:04:04,560 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 19:04:04,855 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 19:04:05,155 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 19:04:05,455 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 19:04:06,298 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 19:04:15,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:04:15,495 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2018-12-03 19:04:15,495 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 19:04:15,495 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 88 [2018-12-03 19:04:15,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:04:15,496 INFO L225 Difference]: With dead ends: 93 [2018-12-03 19:04:15,497 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 19:04:15,499 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 257 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3741 ImplicationChecksByTransitivity, 35.7s TimeCoverageRelationStatistics Valid=25761, Invalid=41061, Unknown=0, NotChecked=0, Total=66822 [2018-12-03 19:04:15,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 19:04:15,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-12-03 19:04:15,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-12-03 19:04:15,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2018-12-03 19:04:15,504 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2018-12-03 19:04:15,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:04:15,505 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2018-12-03 19:04:15,505 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 19:04:15,505 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2018-12-03 19:04:15,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-12-03 19:04:15,505 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:04:15,505 INFO L402 BasicCegarLoop]: trace histogram [87, 1, 1, 1] [2018-12-03 19:04:15,505 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:04:15,506 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:04:15,506 INFO L82 PathProgramCache]: Analyzing trace with hash -464969204, now seen corresponding path program 44 times [2018-12-03 19:04:15,506 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:04:15,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:15,506 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:04:15,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:15,507 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:04:16,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:19,756 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 19:04:19,757 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:19,757 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:04:19,757 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:04:19,757 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:04:19,757 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:19,757 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:04:19,767 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:04:19,767 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:04:19,836 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-12-03 19:04:19,837 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:04:19,844 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:04:19,963 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 19:04:19,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:04:30,683 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 19:04:30,702 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:04:30,702 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 177 [2018-12-03 19:04:30,702 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:04:30,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-12-03 19:04:30,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-12-03 19:04:30,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11664, Invalid=19842, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 19:04:30,704 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 91 states. [2018-12-03 19:04:30,994 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 8 [2018-12-03 19:04:31,273 WARN L180 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 9 [2018-12-03 19:04:31,564 WARN L180 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 19:04:31,873 WARN L180 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 19:04:32,175 WARN L180 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 19:04:32,457 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 19:04:32,763 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 19:04:33,083 WARN L180 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 19:04:33,387 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 19:04:33,710 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 19:04:34,021 WARN L180 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 19:04:34,330 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 19:04:34,641 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 19:04:34,947 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 19:04:35,274 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 19:04:35,597 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 19:04:35,922 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 19:04:36,246 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 19:04:36,573 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 19:04:36,899 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 19:04:37,235 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 19:04:37,566 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 19:04:37,915 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 19:04:38,264 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 19:04:38,605 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 19:04:38,943 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 19:04:39,280 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 19:04:39,615 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 19:04:39,947 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 19:04:40,273 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 19:04:40,596 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 19:04:40,923 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 19:04:41,250 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 19:04:41,586 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 19:04:41,907 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 19:04:42,228 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 19:04:42,541 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 19:04:42,858 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 19:04:43,178 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 19:04:43,493 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 19:04:43,791 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 19:04:44,097 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 19:04:44,399 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 19:04:54,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:04:54,282 INFO L93 Difference]: Finished difference Result 95 states and 96 transitions. [2018-12-03 19:04:54,282 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 19:04:54,283 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 90 [2018-12-03 19:04:54,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:04:54,284 INFO L225 Difference]: With dead ends: 95 [2018-12-03 19:04:54,284 INFO L226 Difference]: Without dead ends: 93 [2018-12-03 19:04:54,286 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3916 ImplicationChecksByTransitivity, 37.5s TimeCoverageRelationStatistics Valid=26976, Invalid=42984, Unknown=0, NotChecked=0, Total=69960 [2018-12-03 19:04:54,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-12-03 19:04:54,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-12-03 19:04:54,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-03 19:04:54,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-12-03 19:04:54,292 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2018-12-03 19:04:54,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:04:54,293 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-12-03 19:04:54,293 INFO L481 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-12-03 19:04:54,293 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-12-03 19:04:54,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-12-03 19:04:54,293 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:04:54,293 INFO L402 BasicCegarLoop]: trace histogram [89, 1, 1, 1] [2018-12-03 19:04:54,293 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:04:54,294 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:04:54,294 INFO L82 PathProgramCache]: Analyzing trace with hash -158748436, now seen corresponding path program 45 times [2018-12-03 19:04:54,294 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:04:54,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:54,295 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:04:54,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:04:54,295 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:04:54,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:04:58,946 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 19:04:58,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:58,946 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:04:58,946 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:04:58,946 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:04:58,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:04:58,947 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:04:58,955 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:04:58,955 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:04:59,544 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:04:59,544 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:04:59,900 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:05:00,027 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 19:05:00,027 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:05:11,256 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 19:05:11,275 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:05:11,275 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 181 [2018-12-03 19:05:11,275 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:05:11,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-12-03 19:05:11,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-12-03 19:05:11,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12199, Invalid=20743, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 19:05:11,277 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 93 states. [2018-12-03 19:05:11,594 WARN L180 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 8 [2018-12-03 19:05:11,912 WARN L180 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 9 [2018-12-03 19:05:12,218 WARN L180 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 19:05:12,556 WARN L180 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 19:05:12,873 WARN L180 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 19:05:13,180 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 19:05:13,503 WARN L180 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 19:05:13,833 WARN L180 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 19:05:14,166 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 19:05:14,485 WARN L180 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 19:05:14,808 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 19:05:15,134 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 19:05:15,455 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 19:05:15,765 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 19:05:16,116 WARN L180 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 19:05:16,459 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 19:05:16,788 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 19:05:17,129 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 19:05:17,507 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 19:05:17,847 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 19:05:18,197 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 19:05:18,536 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 19:05:18,891 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 19:05:19,248 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 19:05:19,608 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 19:05:19,959 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 19:05:20,302 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 19:05:20,658 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 19:05:21,004 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 19:05:21,340 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 19:05:21,693 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 19:05:22,044 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 19:05:22,380 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 19:05:22,719 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 19:05:23,060 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 19:05:23,384 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 19:05:23,724 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 19:05:24,078 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 19:05:24,414 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 19:05:24,750 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 19:05:25,062 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 19:05:25,365 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 19:05:25,676 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 19:05:36,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:05:36,641 INFO L93 Difference]: Finished difference Result 97 states and 98 transitions. [2018-12-03 19:05:36,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 19:05:36,642 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 92 [2018-12-03 19:05:36,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:05:36,643 INFO L225 Difference]: With dead ends: 97 [2018-12-03 19:05:36,643 INFO L226 Difference]: Without dead ends: 95 [2018-12-03 19:05:36,645 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 269 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4095 ImplicationChecksByTransitivity, 40.0s TimeCoverageRelationStatistics Valid=28219, Invalid=44951, Unknown=0, NotChecked=0, Total=73170 [2018-12-03 19:05:36,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-12-03 19:05:36,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2018-12-03 19:05:36,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-12-03 19:05:36,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-12-03 19:05:36,653 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2018-12-03 19:05:36,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:05:36,653 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-12-03 19:05:36,653 INFO L481 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-12-03 19:05:36,653 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-12-03 19:05:36,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-12-03 19:05:36,654 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:05:36,654 INFO L402 BasicCegarLoop]: trace histogram [91, 1, 1, 1] [2018-12-03 19:05:36,654 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:05:36,654 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:05:36,654 INFO L82 PathProgramCache]: Analyzing trace with hash 2061633484, now seen corresponding path program 46 times [2018-12-03 19:05:36,654 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:05:36,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:05:36,655 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:05:36,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:05:36,655 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:05:37,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:05:41,582 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 19:05:41,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:05:41,582 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:05:41,582 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:05:41,582 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:05:41,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:05:41,583 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 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:05:41,591 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:05:41,592 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:05:42,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:05:42,614 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:05:42,835 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 19:05:42,835 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:05:54,631 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 19:05:54,651 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:05:54,651 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 185 [2018-12-03 19:05:54,651 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:05:54,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 19:05:54,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 19:05:54,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12746, Invalid=21664, Unknown=0, NotChecked=0, Total=34410 [2018-12-03 19:05:54,655 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 95 states. [2018-12-03 19:05:55,052 WARN L180 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 8 [2018-12-03 19:05:55,353 WARN L180 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 9 [2018-12-03 19:05:55,692 WARN L180 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 19:05:56,041 WARN L180 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 19:05:56,370 WARN L180 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 19:05:56,687 WARN L180 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 19:05:57,015 WARN L180 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 19:05:57,354 WARN L180 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 19:05:57,684 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 19:05:58,021 WARN L180 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 19:05:58,357 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 19:05:58,692 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 19:05:59,017 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 19:05:59,362 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 19:05:59,721 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 19:06:00,095 WARN L180 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 19:06:00,446 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 19:06:00,838 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 19:06:01,185 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 19:06:01,559 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 19:06:01,921 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 19:06:02,278 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 19:06:02,631 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 19:06:02,993 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 19:06:03,352 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 19:06:03,730 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 19:06:04,095 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 19:06:04,498 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 19:06:04,875 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 19:06:05,260 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 19:06:05,611 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 19:06:05,983 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 19:06:06,362 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 19:06:06,721 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 19:06:07,061 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 19:06:07,418 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 19:06:07,763 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 19:06:08,109 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 19:06:08,456 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 19:06:08,789 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 19:06:09,101 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 19:06:09,421 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 19:06:09,735 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 19:06:10,061 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 19:06:10,381 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 19:06:10,695 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 19:06:21,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:06:21,496 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-12-03 19:06:21,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 19:06:21,497 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 94 [2018-12-03 19:06:21,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:06:21,498 INFO L225 Difference]: With dead ends: 99 [2018-12-03 19:06:21,498 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 19:06:21,500 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 275 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4278 ImplicationChecksByTransitivity, 42.4s TimeCoverageRelationStatistics Valid=29490, Invalid=46962, Unknown=0, NotChecked=0, Total=76452 [2018-12-03 19:06:21,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 19:06:21,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-12-03 19:06:21,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-12-03 19:06:21,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-12-03 19:06:21,506 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2018-12-03 19:06:21,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:06:21,506 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-12-03 19:06:21,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 19:06:21,506 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-12-03 19:06:21,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-12-03 19:06:21,507 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:06:21,507 INFO L402 BasicCegarLoop]: trace histogram [93, 1, 1, 1] [2018-12-03 19:06:21,507 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:06:21,507 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:06:21,507 INFO L82 PathProgramCache]: Analyzing trace with hash 1249912492, now seen corresponding path program 47 times [2018-12-03 19:06:21,507 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:06:21,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:06:21,508 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:06:21,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:06:21,508 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:06:22,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:06:26,465 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 19:06:26,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:06:26,465 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:06:26,465 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:06:26,465 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:06:26,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:06:26,466 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:06:26,474 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:06:26,474 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:06:26,554 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-12-03 19:06:26,554 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:06:26,562 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:06:26,701 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 19:06:26,701 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:06:38,868 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 19:06:38,887 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:06:38,888 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 189 [2018-12-03 19:06:38,888 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:06:38,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 97 states [2018-12-03 19:06:38,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2018-12-03 19:06:38,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13305, Invalid=22605, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 19:06:38,890 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 97 states. [2018-12-03 19:06:39,219 WARN L180 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 8 [2018-12-03 19:06:39,548 WARN L180 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 9 [2018-12-03 19:06:39,882 WARN L180 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 19:06:40,222 WARN L180 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 19:06:40,564 WARN L180 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 19:06:40,917 WARN L180 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 19:06:41,258 WARN L180 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 19:06:41,595 WARN L180 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 19:06:41,940 WARN L180 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 19:06:42,281 WARN L180 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 19:06:42,626 WARN L180 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 19:06:43,016 WARN L180 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 19:06:43,377 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 19:06:43,713 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 19:06:44,066 WARN L180 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 19:06:44,427 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 19:06:44,787 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 19:06:45,164 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 19:06:45,514 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 19:06:45,906 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 19:06:46,280 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 19:06:46,659 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 19:06:47,027 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 19:06:47,402 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 19:06:47,787 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 19:06:48,165 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 19:06:48,533 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 19:06:48,917 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 19:06:49,295 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 19:06:49,679 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 19:06:50,053 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 19:06:50,429 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 19:06:50,799 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 19:06:51,208 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 19:06:51,567 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 19:06:51,943 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 19:06:52,304 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 19:06:52,664 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 19:06:53,020 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 19:06:53,373 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 19:06:53,713 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 19:06:54,048 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 19:06:54,381 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 19:06:54,712 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 19:06:55,039 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 19:06:55,399 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 19:06:55,729 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 19:06:56,085 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 19:06:56,431 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 19:07:07,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:07:07,234 INFO L93 Difference]: Finished difference Result 101 states and 102 transitions. [2018-12-03 19:07:07,234 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-12-03 19:07:07,234 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 96 [2018-12-03 19:07:07,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:07:07,235 INFO L225 Difference]: With dead ends: 101 [2018-12-03 19:07:07,235 INFO L226 Difference]: Without dead ends: 99 [2018-12-03 19:07:07,237 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 281 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4465 ImplicationChecksByTransitivity, 44.4s TimeCoverageRelationStatistics Valid=30789, Invalid=49017, Unknown=0, NotChecked=0, Total=79806 [2018-12-03 19:07:07,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-12-03 19:07:07,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-12-03 19:07:07,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-12-03 19:07:07,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-12-03 19:07:07,245 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2018-12-03 19:07:07,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:07:07,245 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-12-03 19:07:07,245 INFO L481 AbstractCegarLoop]: Interpolant automaton has 97 states. [2018-12-03 19:07:07,245 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-12-03 19:07:07,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-12-03 19:07:07,246 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:07:07,246 INFO L402 BasicCegarLoop]: trace histogram [95, 1, 1, 1] [2018-12-03 19:07:07,246 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:07:07,246 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:07:07,246 INFO L82 PathProgramCache]: Analyzing trace with hash -1424880244, now seen corresponding path program 48 times [2018-12-03 19:07:07,247 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:07:07,247 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:07:07,247 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:07:07,247 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:07:07,248 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:07:07,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:07:13,374 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 19:07:13,374 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:07:13,374 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:07:13,374 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:07:13,374 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:07:13,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:07:13,375 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:07:13,383 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:07:13,383 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:07:14,095 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:07:14,095 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:07:14,530 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:07:14,745 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 19:07:14,745 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:07:27,767 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 19:07:27,787 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:07:27,787 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 193 [2018-12-03 19:07:27,788 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:07:27,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-12-03 19:07:27,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-12-03 19:07:27,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13876, Invalid=23566, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 19:07:27,791 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 99 states. [2018-12-03 19:07:28,137 WARN L180 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 8 [2018-12-03 19:07:28,469 WARN L180 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 9 [2018-12-03 19:07:28,825 WARN L180 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 19:07:29,168 WARN L180 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 19:07:29,522 WARN L180 SmtUtils]: Spent 305.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 19:07:29,873 WARN L180 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 19:07:30,226 WARN L180 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 19:07:30,597 WARN L180 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 19:07:30,957 WARN L180 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 19:07:31,322 WARN L180 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 19:07:31,676 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 19:07:32,064 WARN L180 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 19:07:32,439 WARN L180 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 19:07:32,794 WARN L180 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 19:07:33,176 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 19:07:33,563 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 19:07:33,941 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 19:07:34,347 WARN L180 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 19:07:34,733 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 19:07:35,113 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 19:07:35,506 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 19:07:35,891 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 19:07:36,292 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 19:07:36,697 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 19:07:37,082 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 19:07:37,495 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 19:07:37,867 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 19:07:38,242 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 19:07:38,623 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 19:07:39,015 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 19:07:39,401 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 19:07:39,778 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 19:07:40,158 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 19:07:40,527 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 19:07:40,898 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 19:07:41,291 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 19:07:41,679 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 19:07:42,058 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 19:07:42,440 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 19:07:42,801 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 19:07:43,157 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 19:07:43,512 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 19:07:43,863 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 19:07:44,217 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 19:07:44,563 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 19:07:44,913 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 19:07:45,259 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 19:07:45,603 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 19:07:45,947 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 19:07:46,637 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 19:07:47,332 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 19:07:57,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:07:57,602 INFO L93 Difference]: Finished difference Result 103 states and 104 transitions. [2018-12-03 19:07:57,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 19:07:57,603 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 98 [2018-12-03 19:07:57,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:07:57,603 INFO L225 Difference]: With dead ends: 103 [2018-12-03 19:07:57,604 INFO L226 Difference]: Without dead ends: 101 [2018-12-03 19:07:57,606 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 287 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4656 ImplicationChecksByTransitivity, 47.8s TimeCoverageRelationStatistics Valid=32116, Invalid=51116, Unknown=0, NotChecked=0, Total=83232 [2018-12-03 19:07:57,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-12-03 19:07:57,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2018-12-03 19:07:57,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-12-03 19:07:57,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-12-03 19:07:57,614 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2018-12-03 19:07:57,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:07:57,614 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-12-03 19:07:57,614 INFO L481 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-12-03 19:07:57,614 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-12-03 19:07:57,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-12-03 19:07:57,615 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:07:57,615 INFO L402 BasicCegarLoop]: trace histogram [97, 1, 1, 1] [2018-12-03 19:07:57,615 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:07:57,615 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:07:57,615 INFO L82 PathProgramCache]: Analyzing trace with hash 784710764, now seen corresponding path program 49 times [2018-12-03 19:07:57,616 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:07:57,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:07:57,616 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:07:57,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:07:57,617 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:07:58,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:03,404 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 19:08:03,405 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:03,405 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:08:03,405 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:08:03,405 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:08:03,405 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:03,405 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:08:03,416 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:08:03,416 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:08:04,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:04,738 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:08:06,714 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 19:08:06,714 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:08:20,020 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 19:08:20,042 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:08:20,042 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 197 [2018-12-03 19:08:20,042 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:08:20,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 19:08:20,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 19:08:20,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14459, Invalid=24547, Unknown=0, NotChecked=0, Total=39006 [2018-12-03 19:08:20,044 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 101 states. [2018-12-03 19:08:20,403 WARN L180 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 8 [2018-12-03 19:08:20,768 WARN L180 SmtUtils]: Spent 320.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 9 [2018-12-03 19:08:21,116 WARN L180 SmtUtils]: Spent 316.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2018-12-03 19:08:21,467 WARN L180 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2018-12-03 19:08:21,832 WARN L180 SmtUtils]: Spent 314.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 19:08:22,196 WARN L180 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 19:08:22,557 WARN L180 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 19:08:22,917 WARN L180 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 19:08:23,301 WARN L180 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 19:08:23,678 WARN L180 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 19:08:24,062 WARN L180 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 19:08:24,442 WARN L180 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 19:08:24,804 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 19:08:25,184 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 19:08:25,573 WARN L180 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 19:08:25,957 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 19:08:26,363 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 19:08:26,771 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 19:08:27,168 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 19:08:27,572 WARN L180 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 19:08:27,976 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 19:08:28,394 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 19:08:28,804 WARN L180 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 19:08:29,204 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 19:08:29,611 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 19:08:30,010 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 19:08:30,414 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 19:08:30,840 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11