java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_exp_cong.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/array4.i_4.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-b7bd044-m [2019-01-20 09:57:21,544 INFO L170 SettingsManager]: Resetting all preferences to default values... [2019-01-20 09:57:21,546 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2019-01-20 09:57:21,557 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-01-20 09:57:21,591 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_exp_cong.epf [2019-01-20 09:57:21,609 INFO L110 SettingsManager]: Loading preferences was successful [2019-01-20 09:57:21,609 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2019-01-20 09:57:21,610 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2019-01-20 09:57:21,610 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2019-01-20 09:57:21,610 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-01-20 09:57:21,610 INFO L133 SettingsManager]: * User list type=DISABLED [2019-01-20 09:57:21,611 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2019-01-20 09:57:21,611 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-01-20 09:57:21,611 INFO L133 SettingsManager]: * Explicit value domain=true [2019-01-20 09:57:21,611 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-01-20 09:57:21,612 INFO L133 SettingsManager]: * Octagon Domain=false [2019-01-20 09:57:21,612 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2019-01-20 09:57:21,612 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-01-20 09:57:21,612 INFO L133 SettingsManager]: * Interval Domain=false [2019-01-20 09:57:21,613 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-01-20 09:57:21,613 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2019-01-20 09:57:21,614 INFO L133 SettingsManager]: * Use SBE=true [2019-01-20 09:57:21,615 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-01-20 09:57:21,615 INFO L133 SettingsManager]: * sizeof long=4 [2019-01-20 09:57:21,615 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2019-01-20 09:57:21,616 INFO L133 SettingsManager]: * sizeof POINTER=4 [2019-01-20 09:57:21,616 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2019-01-20 09:57:21,616 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-01-20 09:57:21,616 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-01-20 09:57:21,616 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-01-20 09:57:21,617 INFO L133 SettingsManager]: * sizeof long double=12 [2019-01-20 09:57:21,617 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2019-01-20 09:57:21,617 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-01-20 09:57:21,618 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-01-20 09:57:21,618 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-01-20 09:57:21,618 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2019-01-20 09:57:21,618 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-01-20 09:57:21,618 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-01-20 09:57:21,618 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-01-20 09:57:21,619 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-01-20 09:57:21,619 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-01-20 09:57:21,619 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-01-20 09:57:21,619 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-01-20 09:57:21,620 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-01-20 09:57:21,620 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-01-20 09:57:21,661 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-01-20 09:57:21,674 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-01-20 09:57:21,677 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-01-20 09:57:21,679 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2019-01-20 09:57:21,680 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2019-01-20 09:57:21,681 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/array4.i_4.bpl [2019-01-20 09:57:21,681 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/array4.i_4.bpl' [2019-01-20 09:57:21,739 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-01-20 09:57:21,741 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-01-20 09:57:21,742 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-01-20 09:57:21,742 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-01-20 09:57:21,742 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2019-01-20 09:57:21,762 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:21" (1/1) ... [2019-01-20 09:57:21,775 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:21" (1/1) ... [2019-01-20 09:57:21,785 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-01-20 09:57:21,786 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-01-20 09:57:21,787 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-01-20 09:57:21,787 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2019-01-20 09:57:21,800 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:21" (1/1) ... [2019-01-20 09:57:21,800 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:21" (1/1) ... [2019-01-20 09:57:21,801 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:21" (1/1) ... [2019-01-20 09:57:21,803 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:21" (1/1) ... [2019-01-20 09:57:21,808 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:21" (1/1) ... [2019-01-20 09:57:21,811 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:21" (1/1) ... [2019-01-20 09:57:21,812 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:21" (1/1) ... [2019-01-20 09:57:21,814 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-01-20 09:57:21,815 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-01-20 09:57:21,815 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-01-20 09:57:21,815 INFO L276 PluginConnector]: RCFGBuilder initialized [2019-01-20 09:57:21,817 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:21" (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 [2019-01-20 09:57:21,895 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-01-20 09:57:21,896 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-01-20 09:57:22,082 INFO L281 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-01-20 09:57:22,083 INFO L286 CfgBuilder]: Removed 2 assue(true) statements. [2019-01-20 09:57:22,085 INFO L202 PluginConnector]: Adding new model array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 09:57:22 BoogieIcfgContainer [2019-01-20 09:57:22,085 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-01-20 09:57:22,086 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-01-20 09:57:22,086 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-01-20 09:57:22,090 INFO L276 PluginConnector]: TraceAbstraction initialized [2019-01-20 09:57:22,090 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:21" (1/2) ... [2019-01-20 09:57:22,091 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51f76baf and model type array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 09:57:22, skipping insertion in model container [2019-01-20 09:57:22,092 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 09:57:22" (2/2) ... [2019-01-20 09:57:22,094 INFO L112 eAbstractionObserver]: Analyzing ICFG array4.i_4.bpl [2019-01-20 09:57:22,104 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-01-20 09:57:22,112 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-01-20 09:57:22,130 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-01-20 09:57:22,169 INFO L382 AbstractCegarLoop]: Interprodecural is true [2019-01-20 09:57:22,169 INFO L383 AbstractCegarLoop]: Hoare is true [2019-01-20 09:57:22,169 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-01-20 09:57:22,170 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-01-20 09:57:22,170 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-01-20 09:57:22,170 INFO L387 AbstractCegarLoop]: Difference is false [2019-01-20 09:57:22,170 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-01-20 09:57:22,170 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-01-20 09:57:22,187 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2019-01-20 09:57:22,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2019-01-20 09:57:22,199 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:22,201 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2019-01-20 09:57:22,207 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:22,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:22,215 INFO L82 PathProgramCache]: Analyzing trace with hash 928714, now seen corresponding path program 1 times [2019-01-20 09:57:22,219 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:22,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:22,268 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:22,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:22,269 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:22,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:22,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-20 09:57:22,354 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-01-20 09:57:22,354 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-01-20 09:57:22,355 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-01-20 09:57:22,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-01-20 09:57:22,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-01-20 09:57:22,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-01-20 09:57:22,373 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2019-01-20 09:57:22,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:22,481 INFO L93 Difference]: Finished difference Result 12 states and 16 transitions. [2019-01-20 09:57:22,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-01-20 09:57:22,484 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2019-01-20 09:57:22,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:22,497 INFO L225 Difference]: With dead ends: 12 [2019-01-20 09:57:22,497 INFO L226 Difference]: Without dead ends: 7 [2019-01-20 09:57:22,500 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 [2019-01-20 09:57:22,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2019-01-20 09:57:22,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2019-01-20 09:57:22,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2019-01-20 09:57:22,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2019-01-20 09:57:22,538 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 4 [2019-01-20 09:57:22,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:22,538 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2019-01-20 09:57:22,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-01-20 09:57:22,539 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2019-01-20 09:57:22,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-01-20 09:57:22,539 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:22,539 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-01-20 09:57:22,540 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:22,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:22,540 INFO L82 PathProgramCache]: Analyzing trace with hash 894131125, now seen corresponding path program 1 times [2019-01-20 09:57:22,541 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:22,545 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:22,546 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:22,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:22,546 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:22,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:22,661 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-01-20 09:57:22,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:22,662 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:22,663 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2019-01-20 09:57:22,666 INFO L207 CegarAbsIntRunner]: [0], [5], [7], [12], [14], [16] [2019-01-20 09:57:22,727 INFO L148 AbstractInterpreter]: Using domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2019-01-20 09:57:22,728 INFO L101 FixpointEngine]: Starting fixpoint engine with domain CompoundDomain (maxUnwinding=3, maxParallelStates=2) [2019-01-20 09:57:22,973 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-01-20 09:57:22,974 INFO L272 AbstractInterpreter]: Visited 6 different actions 18 times. Merged at 4 different actions 9 times. Never widened. Performed 166 root evaluator evaluations with a maximum evaluation depth of 5. Performed 166 inverse root evaluator evaluations with a maximum inverse evaluation depth of 5. Found 3 fixpoints after 3 different actions. Largest state had 0 variables. [2019-01-20 09:57:22,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:22,986 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-01-20 09:57:22,986 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:22,987 INFO L193 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 [2019-01-20 09:57:23,017 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:23,017 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:57:23,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:23,066 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:23,081 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-01-20 09:57:23,082 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:23,228 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-01-20 09:57:23,251 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:23,252 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2019-01-20 09:57:23,252 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:23,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-01-20 09:57:23,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-01-20 09:57:23,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-01-20 09:57:23,253 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand 4 states. [2019-01-20 09:57:23,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:23,305 INFO L93 Difference]: Finished difference Result 13 states and 16 transitions. [2019-01-20 09:57:23,306 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-01-20 09:57:23,306 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2019-01-20 09:57:23,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:23,307 INFO L225 Difference]: With dead ends: 13 [2019-01-20 09:57:23,307 INFO L226 Difference]: Without dead ends: 9 [2019-01-20 09:57:23,308 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-01-20 09:57:23,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2019-01-20 09:57:23,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2019-01-20 09:57:23,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2019-01-20 09:57:23,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2019-01-20 09:57:23,310 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2019-01-20 09:57:23,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:23,311 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2019-01-20 09:57:23,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-01-20 09:57:23,311 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2019-01-20 09:57:23,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2019-01-20 09:57:23,312 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:23,312 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1] [2019-01-20 09:57:23,312 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:23,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:23,312 INFO L82 PathProgramCache]: Analyzing trace with hash 315556586, now seen corresponding path program 2 times [2019-01-20 09:57:23,313 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:23,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:23,314 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:23,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:23,315 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:23,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:23,389 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-01-20 09:57:23,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:23,389 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:23,390 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:23,390 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:23,390 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:23,391 INFO L193 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 [2019-01-20 09:57:23,405 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:57:23,406 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:57:23,447 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-01-20 09:57:23,447 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:23,449 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:23,454 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-01-20 09:57:23,454 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:23,606 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-01-20 09:57:23,625 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:23,626 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2019-01-20 09:57:23,626 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:23,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-01-20 09:57:23,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-01-20 09:57:23,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-01-20 09:57:23,627 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 5 states. [2019-01-20 09:57:23,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:23,765 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2019-01-20 09:57:23,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-01-20 09:57:23,765 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2019-01-20 09:57:23,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:23,766 INFO L225 Difference]: With dead ends: 16 [2019-01-20 09:57:23,766 INFO L226 Difference]: Without dead ends: 11 [2019-01-20 09:57:23,767 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-01-20 09:57:23,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2019-01-20 09:57:23,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2019-01-20 09:57:23,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2019-01-20 09:57:23,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2019-01-20 09:57:23,771 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2019-01-20 09:57:23,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:23,771 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2019-01-20 09:57:23,771 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-01-20 09:57:23,772 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2019-01-20 09:57:23,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-01-20 09:57:23,772 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:23,772 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1] [2019-01-20 09:57:23,773 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:23,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:23,773 INFO L82 PathProgramCache]: Analyzing trace with hash -175395819, now seen corresponding path program 3 times [2019-01-20 09:57:23,773 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:23,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:23,774 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:23,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:23,775 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:23,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:23,936 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-01-20 09:57:23,937 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:23,937 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:23,939 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:23,939 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:23,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:23,939 INFO L193 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 [2019-01-20 09:57:23,949 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:57:23,950 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:57:23,973 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:57:23,974 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:23,975 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:23,983 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-01-20 09:57:23,983 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:24,189 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-01-20 09:57:24,221 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:24,221 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2019-01-20 09:57:24,221 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:24,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-01-20 09:57:24,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-01-20 09:57:24,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-01-20 09:57:24,223 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 6 states. [2019-01-20 09:57:24,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:24,274 INFO L93 Difference]: Finished difference Result 19 states and 22 transitions. [2019-01-20 09:57:24,275 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-01-20 09:57:24,275 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2019-01-20 09:57:24,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:24,276 INFO L225 Difference]: With dead ends: 19 [2019-01-20 09:57:24,276 INFO L226 Difference]: Without dead ends: 13 [2019-01-20 09:57:24,277 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-01-20 09:57:24,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-01-20 09:57:24,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-01-20 09:57:24,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-01-20 09:57:24,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2019-01-20 09:57:24,282 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2019-01-20 09:57:24,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:24,282 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2019-01-20 09:57:24,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-01-20 09:57:24,282 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2019-01-20 09:57:24,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-01-20 09:57:24,283 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:24,283 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1] [2019-01-20 09:57:24,283 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:24,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:24,284 INFO L82 PathProgramCache]: Analyzing trace with hash -1258544630, now seen corresponding path program 4 times [2019-01-20 09:57:24,284 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:24,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:24,285 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:24,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:24,285 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:24,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:24,422 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-01-20 09:57:24,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:24,422 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:24,422 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:24,423 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:24,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:24,423 INFO L193 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 [2019-01-20 09:57:24,437 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:24,437 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:57:24,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:24,454 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:24,460 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-01-20 09:57:24,461 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:24,596 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-01-20 09:57:24,615 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:24,615 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2019-01-20 09:57:24,615 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:24,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-01-20 09:57:24,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-01-20 09:57:24,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-01-20 09:57:24,617 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 7 states. [2019-01-20 09:57:24,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:24,657 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2019-01-20 09:57:24,658 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-01-20 09:57:24,658 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2019-01-20 09:57:24,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:24,659 INFO L225 Difference]: With dead ends: 22 [2019-01-20 09:57:24,660 INFO L226 Difference]: Without dead ends: 15 [2019-01-20 09:57:24,660 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-01-20 09:57:24,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-01-20 09:57:24,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-01-20 09:57:24,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-01-20 09:57:24,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2019-01-20 09:57:24,664 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2019-01-20 09:57:24,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:24,664 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2019-01-20 09:57:24,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-01-20 09:57:24,665 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2019-01-20 09:57:24,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-01-20 09:57:24,665 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:24,665 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1] [2019-01-20 09:57:24,666 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:24,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:24,666 INFO L82 PathProgramCache]: Analyzing trace with hash -400886667, now seen corresponding path program 5 times [2019-01-20 09:57:24,666 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:24,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:24,667 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:24,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:24,668 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:24,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:25,075 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-01-20 09:57:25,076 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:25,076 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:25,076 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:25,077 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:25,078 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:25,078 INFO L193 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 [2019-01-20 09:57:25,087 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:57:25,087 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:57:25,108 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-01-20 09:57:25,108 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:25,110 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:25,117 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-01-20 09:57:25,117 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:25,265 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-01-20 09:57:25,286 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:25,286 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2019-01-20 09:57:25,286 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:25,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-01-20 09:57:25,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-01-20 09:57:25,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2019-01-20 09:57:25,287 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 8 states. [2019-01-20 09:57:25,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:25,337 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2019-01-20 09:57:25,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-01-20 09:57:25,338 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2019-01-20 09:57:25,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:25,339 INFO L225 Difference]: With dead ends: 25 [2019-01-20 09:57:25,340 INFO L226 Difference]: Without dead ends: 17 [2019-01-20 09:57:25,341 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2019-01-20 09:57:25,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-01-20 09:57:25,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-01-20 09:57:25,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-01-20 09:57:25,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-01-20 09:57:25,345 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2019-01-20 09:57:25,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:25,345 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-01-20 09:57:25,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-01-20 09:57:25,345 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-01-20 09:57:25,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-01-20 09:57:25,346 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:25,346 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1] [2019-01-20 09:57:25,347 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:25,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:25,347 INFO L82 PathProgramCache]: Analyzing trace with hash -10778326, now seen corresponding path program 6 times [2019-01-20 09:57:25,347 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:25,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:25,356 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:25,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:25,358 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:25,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:25,469 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-01-20 09:57:25,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:25,470 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:25,470 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:25,470 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:25,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:25,471 INFO L193 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 [2019-01-20 09:57:25,479 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:57:25,480 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:57:25,494 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:57:25,495 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:25,496 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:25,503 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-01-20 09:57:25,503 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:25,697 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-01-20 09:57:25,717 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:25,717 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2019-01-20 09:57:25,717 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:25,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-01-20 09:57:25,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-01-20 09:57:25,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2019-01-20 09:57:25,718 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 9 states. [2019-01-20 09:57:25,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:25,814 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2019-01-20 09:57:25,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-01-20 09:57:25,814 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2019-01-20 09:57:25,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:25,815 INFO L225 Difference]: With dead ends: 28 [2019-01-20 09:57:25,815 INFO L226 Difference]: Without dead ends: 19 [2019-01-20 09:57:25,815 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2019-01-20 09:57:25,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-01-20 09:57:25,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-01-20 09:57:25,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-01-20 09:57:25,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2019-01-20 09:57:25,820 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2019-01-20 09:57:25,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:25,820 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2019-01-20 09:57:25,820 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-01-20 09:57:25,820 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2019-01-20 09:57:25,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-01-20 09:57:25,821 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:25,821 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1] [2019-01-20 09:57:25,821 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:25,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:25,822 INFO L82 PathProgramCache]: Analyzing trace with hash 701707477, now seen corresponding path program 7 times [2019-01-20 09:57:25,822 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:25,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:25,823 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:25,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:25,823 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:25,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:26,099 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-01-20 09:57:26,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:26,099 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:26,100 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:26,100 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:26,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:26,100 INFO L193 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 [2019-01-20 09:57:26,109 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:26,109 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:57:26,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:26,126 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:26,132 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-01-20 09:57:26,132 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:26,342 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-01-20 09:57:26,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:26,361 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2019-01-20 09:57:26,361 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:26,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-01-20 09:57:26,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-01-20 09:57:26,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2019-01-20 09:57:26,363 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 10 states. [2019-01-20 09:57:26,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:26,407 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2019-01-20 09:57:26,411 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-01-20 09:57:26,411 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2019-01-20 09:57:26,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:26,412 INFO L225 Difference]: With dead ends: 31 [2019-01-20 09:57:26,412 INFO L226 Difference]: Without dead ends: 21 [2019-01-20 09:57:26,413 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2019-01-20 09:57:26,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-01-20 09:57:26,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-01-20 09:57:26,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-01-20 09:57:26,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2019-01-20 09:57:26,417 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2019-01-20 09:57:26,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:26,417 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2019-01-20 09:57:26,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-01-20 09:57:26,417 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2019-01-20 09:57:26,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-01-20 09:57:26,418 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:26,418 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1] [2019-01-20 09:57:26,418 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:26,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:26,419 INFO L82 PathProgramCache]: Analyzing trace with hash -718063542, now seen corresponding path program 8 times [2019-01-20 09:57:26,419 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:26,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:26,420 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:26,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:26,420 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:26,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:26,550 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-01-20 09:57:26,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:26,551 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:26,551 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:26,551 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:26,551 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:26,551 INFO L193 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 [2019-01-20 09:57:26,571 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:57:26,571 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:57:26,595 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-01-20 09:57:26,596 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:26,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:26,606 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-01-20 09:57:26,607 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:26,829 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-01-20 09:57:26,850 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:26,850 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2019-01-20 09:57:26,850 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:26,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-01-20 09:57:26,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-01-20 09:57:26,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-01-20 09:57:26,852 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2019-01-20 09:57:27,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:27,022 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2019-01-20 09:57:27,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-01-20 09:57:27,022 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2019-01-20 09:57:27,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:27,023 INFO L225 Difference]: With dead ends: 34 [2019-01-20 09:57:27,023 INFO L226 Difference]: Without dead ends: 23 [2019-01-20 09:57:27,024 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-01-20 09:57:27,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-01-20 09:57:27,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-01-20 09:57:27,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-01-20 09:57:27,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2019-01-20 09:57:27,027 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2019-01-20 09:57:27,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:27,028 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2019-01-20 09:57:27,028 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-01-20 09:57:27,028 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2019-01-20 09:57:27,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-01-20 09:57:27,029 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:27,029 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1] [2019-01-20 09:57:27,029 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:27,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:27,030 INFO L82 PathProgramCache]: Analyzing trace with hash -317821643, now seen corresponding path program 9 times [2019-01-20 09:57:27,030 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:27,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:27,031 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:27,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:27,031 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:27,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:27,310 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-01-20 09:57:27,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:27,310 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:27,310 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:27,310 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:27,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:27,311 INFO L193 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 [2019-01-20 09:57:27,320 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:57:27,320 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:57:27,389 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:57:27,389 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:27,391 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:27,396 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-01-20 09:57:27,397 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:27,607 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-01-20 09:57:27,628 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:27,628 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2019-01-20 09:57:27,628 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:27,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-01-20 09:57:27,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-01-20 09:57:27,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2019-01-20 09:57:27,629 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 12 states. [2019-01-20 09:57:27,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:27,726 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2019-01-20 09:57:27,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-01-20 09:57:27,730 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2019-01-20 09:57:27,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:27,731 INFO L225 Difference]: With dead ends: 37 [2019-01-20 09:57:27,731 INFO L226 Difference]: Without dead ends: 25 [2019-01-20 09:57:27,732 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2019-01-20 09:57:27,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-01-20 09:57:27,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-01-20 09:57:27,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-01-20 09:57:27,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2019-01-20 09:57:27,738 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2019-01-20 09:57:27,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:27,738 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2019-01-20 09:57:27,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-01-20 09:57:27,738 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2019-01-20 09:57:27,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-01-20 09:57:27,743 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:27,743 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1] [2019-01-20 09:57:27,744 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:27,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:27,744 INFO L82 PathProgramCache]: Analyzing trace with hash 1145646954, now seen corresponding path program 10 times [2019-01-20 09:57:27,744 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:27,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:27,745 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:27,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:27,745 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:27,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:28,150 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-01-20 09:57:28,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:28,150 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:28,151 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:28,151 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:28,151 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:28,151 INFO L193 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 [2019-01-20 09:57:28,170 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:28,170 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:57:28,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:28,187 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:28,193 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-01-20 09:57:28,193 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:28,852 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-01-20 09:57:28,871 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:28,871 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2019-01-20 09:57:28,871 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:28,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-01-20 09:57:28,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-01-20 09:57:28,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2019-01-20 09:57:28,872 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 13 states. [2019-01-20 09:57:28,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:28,937 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2019-01-20 09:57:28,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-01-20 09:57:28,939 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2019-01-20 09:57:28,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:28,940 INFO L225 Difference]: With dead ends: 40 [2019-01-20 09:57:28,940 INFO L226 Difference]: Without dead ends: 27 [2019-01-20 09:57:28,941 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2019-01-20 09:57:28,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-01-20 09:57:28,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-01-20 09:57:28,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-01-20 09:57:28,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2019-01-20 09:57:28,945 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2019-01-20 09:57:28,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:28,945 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2019-01-20 09:57:28,945 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-01-20 09:57:28,945 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2019-01-20 09:57:28,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-01-20 09:57:28,946 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:28,946 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1] [2019-01-20 09:57:28,946 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:28,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:28,947 INFO L82 PathProgramCache]: Analyzing trace with hash 430349717, now seen corresponding path program 11 times [2019-01-20 09:57:28,947 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:28,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:28,947 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:28,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:28,948 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:28,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:29,118 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-01-20 09:57:29,118 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:29,118 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:29,118 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:29,119 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:29,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:29,119 INFO L193 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 [2019-01-20 09:57:29,130 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:57:29,131 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:57:29,253 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2019-01-20 09:57:29,253 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:29,257 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:29,318 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-01-20 09:57:29,320 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-20 09:57:29,390 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-20 09:57:29,390 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2019-01-20 09:57:29,759 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 49 [2019-01-20 09:57:29,764 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 8 xjuncts. [2019-01-20 09:57:29,869 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-20 09:57:29,869 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:42, output treesize:3 [2019-01-20 09:57:29,872 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-01-20 09:57:29,872 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:30,599 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-01-20 09:57:30,626 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:30,627 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14] total 36 [2019-01-20 09:57:30,627 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:30,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-01-20 09:57:30,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-01-20 09:57:30,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=549, Invalid=711, Unknown=0, NotChecked=0, Total=1260 [2019-01-20 09:57:30,629 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 24 states. [2019-01-20 09:57:33,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:33,188 INFO L93 Difference]: Finished difference Result 43 states and 46 transitions. [2019-01-20 09:57:33,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-01-20 09:57:33,188 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 26 [2019-01-20 09:57:33,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:33,189 INFO L225 Difference]: With dead ends: 43 [2019-01-20 09:57:33,189 INFO L226 Difference]: Without dead ends: 29 [2019-01-20 09:57:33,191 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 554 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=766, Invalid=1040, Unknown=0, NotChecked=0, Total=1806 [2019-01-20 09:57:33,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-01-20 09:57:33,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-01-20 09:57:33,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-01-20 09:57:33,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2019-01-20 09:57:33,197 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2019-01-20 09:57:33,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:33,197 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2019-01-20 09:57:33,197 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-01-20 09:57:33,197 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2019-01-20 09:57:33,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-01-20 09:57:33,198 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:33,198 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1] [2019-01-20 09:57:33,198 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:33,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:33,199 INFO L82 PathProgramCache]: Analyzing trace with hash -454857078, now seen corresponding path program 12 times [2019-01-20 09:57:33,199 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:33,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:33,200 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:33,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:33,200 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:33,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:33,352 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-01-20 09:57:33,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:33,352 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:33,352 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:33,352 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:33,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:33,353 INFO L193 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 [2019-01-20 09:57:33,369 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:57:33,370 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:57:33,416 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:57:33,416 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:33,419 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:33,428 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-01-20 09:57:33,428 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:33,726 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-01-20 09:57:33,750 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:33,750 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2019-01-20 09:57:33,750 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:33,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-01-20 09:57:33,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-01-20 09:57:33,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2019-01-20 09:57:33,751 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 15 states. [2019-01-20 09:57:33,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:33,878 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2019-01-20 09:57:33,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-01-20 09:57:33,878 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2019-01-20 09:57:33,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:33,879 INFO L225 Difference]: With dead ends: 46 [2019-01-20 09:57:33,879 INFO L226 Difference]: Without dead ends: 31 [2019-01-20 09:57:33,880 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2019-01-20 09:57:33,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-01-20 09:57:33,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-01-20 09:57:33,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-01-20 09:57:33,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2019-01-20 09:57:33,887 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2019-01-20 09:57:33,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:33,887 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2019-01-20 09:57:33,887 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-01-20 09:57:33,887 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2019-01-20 09:57:33,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-01-20 09:57:33,888 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:33,888 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1] [2019-01-20 09:57:33,889 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:33,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:33,889 INFO L82 PathProgramCache]: Analyzing trace with hash -319437323, now seen corresponding path program 13 times [2019-01-20 09:57:33,889 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:33,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:33,890 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:33,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:33,890 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:33,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:34,249 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-01-20 09:57:34,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:34,250 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:34,250 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:34,250 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:34,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:34,250 INFO L193 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 [2019-01-20 09:57:34,259 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:34,260 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:57:34,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:34,282 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:34,288 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-01-20 09:57:34,288 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:34,697 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-01-20 09:57:34,718 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:34,718 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2019-01-20 09:57:34,718 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:34,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-01-20 09:57:34,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-01-20 09:57:34,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2019-01-20 09:57:34,720 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 16 states. [2019-01-20 09:57:34,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:34,801 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2019-01-20 09:57:34,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-01-20 09:57:34,801 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2019-01-20 09:57:34,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:34,802 INFO L225 Difference]: With dead ends: 49 [2019-01-20 09:57:34,802 INFO L226 Difference]: Without dead ends: 33 [2019-01-20 09:57:34,804 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2019-01-20 09:57:34,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-01-20 09:57:34,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2019-01-20 09:57:34,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-01-20 09:57:34,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2019-01-20 09:57:34,810 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2019-01-20 09:57:34,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:34,810 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2019-01-20 09:57:34,810 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-01-20 09:57:34,810 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2019-01-20 09:57:34,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-01-20 09:57:34,811 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:34,811 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1] [2019-01-20 09:57:34,811 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:34,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:34,812 INFO L82 PathProgramCache]: Analyzing trace with hash 969405866, now seen corresponding path program 14 times [2019-01-20 09:57:34,812 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:34,813 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:34,813 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:34,813 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:34,813 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:34,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:35,059 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-01-20 09:57:35,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:35,060 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:35,060 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:35,060 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:35,060 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:35,060 INFO L193 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 [2019-01-20 09:57:35,069 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:57:35,069 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:57:35,109 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2019-01-20 09:57:35,110 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:35,112 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:35,119 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-01-20 09:57:35,120 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:35,473 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-01-20 09:57:35,492 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:35,493 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 32 [2019-01-20 09:57:35,493 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:35,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-01-20 09:57:35,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-01-20 09:57:35,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2019-01-20 09:57:35,494 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 17 states. [2019-01-20 09:57:35,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:35,603 INFO L93 Difference]: Finished difference Result 52 states and 55 transitions. [2019-01-20 09:57:35,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-01-20 09:57:35,603 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2019-01-20 09:57:35,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:35,604 INFO L225 Difference]: With dead ends: 52 [2019-01-20 09:57:35,604 INFO L226 Difference]: Without dead ends: 35 [2019-01-20 09:57:35,605 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2019-01-20 09:57:35,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-01-20 09:57:35,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2019-01-20 09:57:35,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-01-20 09:57:35,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2019-01-20 09:57:35,611 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2019-01-20 09:57:35,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:35,611 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2019-01-20 09:57:35,611 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-01-20 09:57:35,611 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2019-01-20 09:57:35,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-01-20 09:57:35,612 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:35,612 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1] [2019-01-20 09:57:35,613 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:35,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:35,613 INFO L82 PathProgramCache]: Analyzing trace with hash -1714035115, now seen corresponding path program 15 times [2019-01-20 09:57:35,613 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:35,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:35,614 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:35,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:35,614 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:35,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:35,849 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-01-20 09:57:35,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:35,849 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:35,850 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:35,850 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:35,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:35,850 INFO L193 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 [2019-01-20 09:57:35,858 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:57:35,858 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:57:35,881 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:57:35,881 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:35,883 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:35,890 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-01-20 09:57:35,891 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:36,638 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-01-20 09:57:36,658 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:36,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2019-01-20 09:57:36,658 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:36,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-01-20 09:57:36,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-01-20 09:57:36,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2019-01-20 09:57:36,659 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 18 states. [2019-01-20 09:57:36,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:36,801 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2019-01-20 09:57:36,802 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-01-20 09:57:36,802 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2019-01-20 09:57:36,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:36,803 INFO L225 Difference]: With dead ends: 55 [2019-01-20 09:57:36,803 INFO L226 Difference]: Without dead ends: 37 [2019-01-20 09:57:36,804 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2019-01-20 09:57:36,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-01-20 09:57:36,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2019-01-20 09:57:36,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-01-20 09:57:36,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2019-01-20 09:57:36,810 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2019-01-20 09:57:36,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:36,810 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2019-01-20 09:57:36,810 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-01-20 09:57:36,811 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2019-01-20 09:57:36,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-01-20 09:57:36,811 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:36,812 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1] [2019-01-20 09:57:36,812 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:36,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:36,812 INFO L82 PathProgramCache]: Analyzing trace with hash 272417994, now seen corresponding path program 16 times [2019-01-20 09:57:36,812 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:36,813 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:36,813 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:36,813 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:36,813 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:36,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:37,016 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-01-20 09:57:37,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:37,017 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:37,017 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:37,017 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:37,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:37,017 INFO L193 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 [2019-01-20 09:57:37,026 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:37,026 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:57:37,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:37,052 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:37,058 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-01-20 09:57:37,059 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:37,990 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-01-20 09:57:38,008 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:38,009 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2019-01-20 09:57:38,009 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:38,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-01-20 09:57:38,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-01-20 09:57:38,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2019-01-20 09:57:38,010 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 19 states. [2019-01-20 09:57:38,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:38,081 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2019-01-20 09:57:38,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-01-20 09:57:38,082 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2019-01-20 09:57:38,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:38,083 INFO L225 Difference]: With dead ends: 58 [2019-01-20 09:57:38,083 INFO L226 Difference]: Without dead ends: 39 [2019-01-20 09:57:38,084 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2019-01-20 09:57:38,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-01-20 09:57:38,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-01-20 09:57:38,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-01-20 09:57:38,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2019-01-20 09:57:38,090 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2019-01-20 09:57:38,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:38,091 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2019-01-20 09:57:38,091 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-01-20 09:57:38,091 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2019-01-20 09:57:38,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-01-20 09:57:38,093 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:38,093 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1] [2019-01-20 09:57:38,093 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:38,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:38,093 INFO L82 PathProgramCache]: Analyzing trace with hash -392102219, now seen corresponding path program 17 times [2019-01-20 09:57:38,094 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:38,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:38,094 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:38,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:38,095 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:38,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:39,788 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-01-20 09:57:39,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:39,788 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:39,788 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:39,788 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:39,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:39,789 INFO L193 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 [2019-01-20 09:57:39,797 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:57:39,797 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:57:39,859 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-01-20 09:57:39,859 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:39,863 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:39,871 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-01-20 09:57:39,871 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:40,286 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-01-20 09:57:40,307 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:40,307 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2019-01-20 09:57:40,307 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:40,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-01-20 09:57:40,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-01-20 09:57:40,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2019-01-20 09:57:40,309 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 20 states. [2019-01-20 09:57:40,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:40,389 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2019-01-20 09:57:40,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-01-20 09:57:40,390 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2019-01-20 09:57:40,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:40,391 INFO L225 Difference]: With dead ends: 61 [2019-01-20 09:57:40,391 INFO L226 Difference]: Without dead ends: 41 [2019-01-20 09:57:40,392 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2019-01-20 09:57:40,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-01-20 09:57:40,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2019-01-20 09:57:40,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-01-20 09:57:40,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2019-01-20 09:57:40,398 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2019-01-20 09:57:40,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:40,398 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2019-01-20 09:57:40,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-01-20 09:57:40,398 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2019-01-20 09:57:40,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-01-20 09:57:40,399 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:40,399 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1] [2019-01-20 09:57:40,399 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:40,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:40,400 INFO L82 PathProgramCache]: Analyzing trace with hash -536355862, now seen corresponding path program 18 times [2019-01-20 09:57:40,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:40,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:40,401 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:40,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:40,401 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:40,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:40,709 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2019-01-20 09:57:40,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:40,710 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:40,710 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:40,710 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:40,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:40,710 INFO L193 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 [2019-01-20 09:57:40,719 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:57:40,719 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:57:40,745 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:57:40,745 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:40,748 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:40,756 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2019-01-20 09:57:40,756 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:41,223 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2019-01-20 09:57:41,242 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:41,242 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2019-01-20 09:57:41,242 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:41,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-01-20 09:57:41,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-01-20 09:57:41,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2019-01-20 09:57:41,244 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2019-01-20 09:57:41,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:41,397 INFO L93 Difference]: Finished difference Result 64 states and 67 transitions. [2019-01-20 09:57:41,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-01-20 09:57:41,398 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2019-01-20 09:57:41,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:41,399 INFO L225 Difference]: With dead ends: 64 [2019-01-20 09:57:41,399 INFO L226 Difference]: Without dead ends: 43 [2019-01-20 09:57:41,400 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2019-01-20 09:57:41,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-01-20 09:57:41,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2019-01-20 09:57:41,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-01-20 09:57:41,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2019-01-20 09:57:41,405 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2019-01-20 09:57:41,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:41,406 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2019-01-20 09:57:41,406 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-01-20 09:57:41,406 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2019-01-20 09:57:41,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-01-20 09:57:41,407 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:41,407 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1] [2019-01-20 09:57:41,407 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:41,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:41,407 INFO L82 PathProgramCache]: Analyzing trace with hash -684650731, now seen corresponding path program 19 times [2019-01-20 09:57:41,407 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:41,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:41,408 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:41,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:41,408 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:41,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:41,679 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-01-20 09:57:41,679 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:41,679 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:41,679 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:41,679 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:41,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:41,680 INFO L193 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 [2019-01-20 09:57:41,689 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:41,689 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:57:41,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:41,715 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:41,723 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-01-20 09:57:41,723 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:42,421 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-01-20 09:57:42,442 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:42,442 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2019-01-20 09:57:42,442 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:42,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-01-20 09:57:42,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-01-20 09:57:42,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2019-01-20 09:57:42,444 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 22 states. [2019-01-20 09:57:42,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:42,516 INFO L93 Difference]: Finished difference Result 67 states and 70 transitions. [2019-01-20 09:57:42,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-01-20 09:57:42,517 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 42 [2019-01-20 09:57:42,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:42,518 INFO L225 Difference]: With dead ends: 67 [2019-01-20 09:57:42,518 INFO L226 Difference]: Without dead ends: 45 [2019-01-20 09:57:42,519 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2019-01-20 09:57:42,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-01-20 09:57:42,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2019-01-20 09:57:42,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-01-20 09:57:42,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2019-01-20 09:57:42,525 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2019-01-20 09:57:42,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:42,525 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2019-01-20 09:57:42,525 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-01-20 09:57:42,526 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2019-01-20 09:57:42,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-01-20 09:57:42,526 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:42,526 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1] [2019-01-20 09:57:42,527 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:42,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:42,527 INFO L82 PathProgramCache]: Analyzing trace with hash 728709898, now seen corresponding path program 20 times [2019-01-20 09:57:42,527 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:42,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:42,528 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:42,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:42,528 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:42,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:42,814 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-01-20 09:57:42,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:42,815 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:42,815 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:42,815 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:42,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:42,815 INFO L193 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 [2019-01-20 09:57:42,824 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:57:42,824 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:57:42,928 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2019-01-20 09:57:42,928 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:42,930 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:42,938 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-01-20 09:57:42,939 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:43,437 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-01-20 09:57:43,456 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:43,457 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2019-01-20 09:57:43,457 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:43,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-01-20 09:57:43,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-01-20 09:57:43,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2019-01-20 09:57:43,458 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 23 states. [2019-01-20 09:57:43,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:43,555 INFO L93 Difference]: Finished difference Result 70 states and 73 transitions. [2019-01-20 09:57:43,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-01-20 09:57:43,556 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 44 [2019-01-20 09:57:43,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:43,557 INFO L225 Difference]: With dead ends: 70 [2019-01-20 09:57:43,557 INFO L226 Difference]: Without dead ends: 47 [2019-01-20 09:57:43,558 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2019-01-20 09:57:43,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-01-20 09:57:43,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-01-20 09:57:43,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-01-20 09:57:43,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2019-01-20 09:57:43,562 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2019-01-20 09:57:43,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:43,562 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2019-01-20 09:57:43,562 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-01-20 09:57:43,562 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2019-01-20 09:57:43,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-01-20 09:57:43,563 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:43,563 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1] [2019-01-20 09:57:43,564 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:43,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:43,564 INFO L82 PathProgramCache]: Analyzing trace with hash 954210165, now seen corresponding path program 21 times [2019-01-20 09:57:43,564 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:43,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:43,565 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:43,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:43,565 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:43,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:43,888 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2019-01-20 09:57:43,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:43,888 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:43,888 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:43,888 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:43,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:43,889 INFO L193 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 [2019-01-20 09:57:43,897 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:57:43,897 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:57:43,928 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:57:43,928 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:43,931 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:43,939 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2019-01-20 09:57:43,939 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:44,773 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2019-01-20 09:57:44,792 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:44,793 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2019-01-20 09:57:44,793 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:44,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-01-20 09:57:44,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-01-20 09:57:44,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2019-01-20 09:57:44,794 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 24 states. [2019-01-20 09:57:44,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:44,878 INFO L93 Difference]: Finished difference Result 73 states and 76 transitions. [2019-01-20 09:57:44,879 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-01-20 09:57:44,879 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2019-01-20 09:57:44,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:44,880 INFO L225 Difference]: With dead ends: 73 [2019-01-20 09:57:44,881 INFO L226 Difference]: Without dead ends: 49 [2019-01-20 09:57:44,882 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2019-01-20 09:57:44,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-01-20 09:57:44,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2019-01-20 09:57:44,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-01-20 09:57:44,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2019-01-20 09:57:44,886 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2019-01-20 09:57:44,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:44,886 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2019-01-20 09:57:44,886 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-01-20 09:57:44,887 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2019-01-20 09:57:44,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-01-20 09:57:44,887 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:44,887 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1] [2019-01-20 09:57:44,888 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:44,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:44,888 INFO L82 PathProgramCache]: Analyzing trace with hash -549920214, now seen corresponding path program 22 times [2019-01-20 09:57:44,888 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:44,889 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:44,889 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:44,889 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:44,889 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:44,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:45,178 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-01-20 09:57:45,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:45,179 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:45,179 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:45,179 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:45,179 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:45,179 INFO L193 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 [2019-01-20 09:57:45,191 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:45,191 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:57:45,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:45,225 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:45,234 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-01-20 09:57:45,234 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:45,835 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-01-20 09:57:45,854 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:45,855 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2019-01-20 09:57:45,855 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:45,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-01-20 09:57:45,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-01-20 09:57:45,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2019-01-20 09:57:45,856 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 25 states. [2019-01-20 09:57:45,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:45,935 INFO L93 Difference]: Finished difference Result 76 states and 79 transitions. [2019-01-20 09:57:45,936 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-01-20 09:57:45,936 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 48 [2019-01-20 09:57:45,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:45,937 INFO L225 Difference]: With dead ends: 76 [2019-01-20 09:57:45,937 INFO L226 Difference]: Without dead ends: 51 [2019-01-20 09:57:45,938 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2019-01-20 09:57:45,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-01-20 09:57:45,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2019-01-20 09:57:45,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-01-20 09:57:45,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2019-01-20 09:57:45,943 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2019-01-20 09:57:45,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:45,943 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2019-01-20 09:57:45,943 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-01-20 09:57:45,944 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2019-01-20 09:57:45,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-01-20 09:57:45,944 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:45,944 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1] [2019-01-20 09:57:45,944 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:45,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:45,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1451759573, now seen corresponding path program 23 times [2019-01-20 09:57:45,945 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:45,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:45,947 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:45,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:45,947 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:45,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:46,804 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-01-20 09:57:46,805 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:46,805 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:46,805 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:46,805 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:46,805 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:46,805 INFO L193 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 [2019-01-20 09:57:46,813 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:57:46,813 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:57:46,983 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2019-01-20 09:57:46,983 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:46,987 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:46,994 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-01-20 09:57:46,994 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:48,143 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-01-20 09:57:48,163 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:48,164 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26, 26] total 50 [2019-01-20 09:57:48,164 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:48,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-01-20 09:57:48,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-01-20 09:57:48,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2019-01-20 09:57:48,165 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 26 states. [2019-01-20 09:57:48,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:48,236 INFO L93 Difference]: Finished difference Result 79 states and 82 transitions. [2019-01-20 09:57:48,236 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-01-20 09:57:48,236 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 50 [2019-01-20 09:57:48,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:48,237 INFO L225 Difference]: With dead ends: 79 [2019-01-20 09:57:48,237 INFO L226 Difference]: Without dead ends: 53 [2019-01-20 09:57:48,239 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2019-01-20 09:57:48,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-01-20 09:57:48,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2019-01-20 09:57:48,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-01-20 09:57:48,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2019-01-20 09:57:48,243 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2019-01-20 09:57:48,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:48,244 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2019-01-20 09:57:48,244 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-01-20 09:57:48,244 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2019-01-20 09:57:48,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-01-20 09:57:48,244 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:48,245 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1] [2019-01-20 09:57:48,245 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:48,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:48,245 INFO L82 PathProgramCache]: Analyzing trace with hash -1297428150, now seen corresponding path program 24 times [2019-01-20 09:57:48,245 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:48,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:48,246 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:48,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:48,246 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:48,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:48,877 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2019-01-20 09:57:48,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:48,878 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:48,878 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:48,878 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:48,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:48,878 INFO L193 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 [2019-01-20 09:57:48,887 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:57:48,887 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:57:48,922 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:57:48,922 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:48,924 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:48,930 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2019-01-20 09:57:48,931 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:49,876 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2019-01-20 09:57:49,895 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:49,895 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2019-01-20 09:57:49,895 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:49,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-01-20 09:57:49,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-01-20 09:57:49,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2019-01-20 09:57:49,897 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 27 states. [2019-01-20 09:57:50,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:50,029 INFO L93 Difference]: Finished difference Result 82 states and 85 transitions. [2019-01-20 09:57:50,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-01-20 09:57:50,030 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 52 [2019-01-20 09:57:50,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:50,030 INFO L225 Difference]: With dead ends: 82 [2019-01-20 09:57:50,030 INFO L226 Difference]: Without dead ends: 55 [2019-01-20 09:57:50,032 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2019-01-20 09:57:50,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-01-20 09:57:50,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2019-01-20 09:57:50,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-01-20 09:57:50,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2019-01-20 09:57:50,038 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2019-01-20 09:57:50,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:50,038 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2019-01-20 09:57:50,038 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-01-20 09:57:50,039 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2019-01-20 09:57:50,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-01-20 09:57:50,039 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:50,039 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1] [2019-01-20 09:57:50,040 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:50,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:50,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1904013259, now seen corresponding path program 25 times [2019-01-20 09:57:50,040 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:50,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:50,041 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:50,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:50,041 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:50,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:50,465 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2019-01-20 09:57:50,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:50,466 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:50,466 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:50,466 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:50,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:50,466 INFO L193 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 [2019-01-20 09:57:50,476 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:50,476 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:57:50,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:50,513 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:50,522 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2019-01-20 09:57:50,522 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:51,371 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2019-01-20 09:57:51,390 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:51,391 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2019-01-20 09:57:51,391 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:51,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-01-20 09:57:51,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-01-20 09:57:51,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2019-01-20 09:57:51,392 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 28 states. [2019-01-20 09:57:51,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:51,483 INFO L93 Difference]: Finished difference Result 85 states and 88 transitions. [2019-01-20 09:57:51,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-01-20 09:57:51,484 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 54 [2019-01-20 09:57:51,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:51,485 INFO L225 Difference]: With dead ends: 85 [2019-01-20 09:57:51,485 INFO L226 Difference]: Without dead ends: 57 [2019-01-20 09:57:51,487 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2019-01-20 09:57:51,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-01-20 09:57:51,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2019-01-20 09:57:51,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-01-20 09:57:51,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2019-01-20 09:57:51,491 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2019-01-20 09:57:51,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:51,491 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2019-01-20 09:57:51,491 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-01-20 09:57:51,491 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2019-01-20 09:57:51,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-01-20 09:57:51,492 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:51,492 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1] [2019-01-20 09:57:51,492 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:51,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:51,492 INFO L82 PathProgramCache]: Analyzing trace with hash -2020931478, now seen corresponding path program 26 times [2019-01-20 09:57:51,492 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:51,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:51,493 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:51,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:51,494 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:51,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:51,974 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2019-01-20 09:57:51,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:51,974 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:51,974 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:51,975 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:51,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:51,975 INFO L193 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 [2019-01-20 09:57:51,983 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:57:51,983 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:57:52,137 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2019-01-20 09:57:52,138 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:52,141 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:52,148 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2019-01-20 09:57:52,148 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:52,957 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2019-01-20 09:57:52,977 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:52,978 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 29] total 56 [2019-01-20 09:57:52,978 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:52,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-01-20 09:57:52,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-01-20 09:57:52,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2019-01-20 09:57:52,980 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 29 states. [2019-01-20 09:57:53,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:53,066 INFO L93 Difference]: Finished difference Result 88 states and 91 transitions. [2019-01-20 09:57:53,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-01-20 09:57:53,066 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 56 [2019-01-20 09:57:53,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:53,067 INFO L225 Difference]: With dead ends: 88 [2019-01-20 09:57:53,067 INFO L226 Difference]: Without dead ends: 59 [2019-01-20 09:57:53,069 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2019-01-20 09:57:53,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-01-20 09:57:53,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2019-01-20 09:57:53,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-01-20 09:57:53,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2019-01-20 09:57:53,072 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2019-01-20 09:57:53,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:53,072 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2019-01-20 09:57:53,072 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-01-20 09:57:53,072 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2019-01-20 09:57:53,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-01-20 09:57:53,073 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:53,073 INFO L402 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1] [2019-01-20 09:57:53,073 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:53,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:53,074 INFO L82 PathProgramCache]: Analyzing trace with hash -190119787, now seen corresponding path program 27 times [2019-01-20 09:57:53,074 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:53,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:53,074 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:53,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:53,075 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:53,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:53,625 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2019-01-20 09:57:53,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:53,626 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:53,626 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:53,626 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:53,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:53,626 INFO L193 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 [2019-01-20 09:57:53,634 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:57:53,635 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:57:53,672 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:57:53,673 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:53,674 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:53,683 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2019-01-20 09:57:53,684 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:54,671 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2019-01-20 09:57:54,689 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:54,689 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2019-01-20 09:57:54,689 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:54,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-01-20 09:57:54,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-01-20 09:57:54,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2019-01-20 09:57:54,691 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand 30 states. [2019-01-20 09:57:54,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:54,826 INFO L93 Difference]: Finished difference Result 91 states and 94 transitions. [2019-01-20 09:57:54,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-01-20 09:57:54,826 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 58 [2019-01-20 09:57:54,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:54,827 INFO L225 Difference]: With dead ends: 91 [2019-01-20 09:57:54,827 INFO L226 Difference]: Without dead ends: 61 [2019-01-20 09:57:54,828 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2019-01-20 09:57:54,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-01-20 09:57:54,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2019-01-20 09:57:54,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-01-20 09:57:54,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2019-01-20 09:57:54,830 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 58 [2019-01-20 09:57:54,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:54,831 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2019-01-20 09:57:54,831 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-01-20 09:57:54,831 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2019-01-20 09:57:54,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-01-20 09:57:54,831 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:54,832 INFO L402 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1] [2019-01-20 09:57:54,832 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:54,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:54,832 INFO L82 PathProgramCache]: Analyzing trace with hash -903903350, now seen corresponding path program 28 times [2019-01-20 09:57:54,832 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:54,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:54,833 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:54,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:54,833 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:54,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:55,454 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2019-01-20 09:57:55,455 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:55,455 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:55,455 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:55,455 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:55,455 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:55,455 INFO L193 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 [2019-01-20 09:57:55,464 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:55,464 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:57:55,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:55,517 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:55,532 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2019-01-20 09:57:55,532 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:56,607 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2019-01-20 09:57:56,626 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:56,626 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 59 [2019-01-20 09:57:56,626 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:56,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-01-20 09:57:56,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-01-20 09:57:56,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1770, Invalid=1770, Unknown=0, NotChecked=0, Total=3540 [2019-01-20 09:57:56,627 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 31 states. [2019-01-20 09:57:56,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:56,747 INFO L93 Difference]: Finished difference Result 94 states and 97 transitions. [2019-01-20 09:57:56,748 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-01-20 09:57:56,748 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 60 [2019-01-20 09:57:56,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:56,749 INFO L225 Difference]: With dead ends: 94 [2019-01-20 09:57:56,749 INFO L226 Difference]: Without dead ends: 63 [2019-01-20 09:57:56,750 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1770, Invalid=1770, Unknown=0, NotChecked=0, Total=3540 [2019-01-20 09:57:56,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2019-01-20 09:57:56,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2019-01-20 09:57:56,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-01-20 09:57:56,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2019-01-20 09:57:56,753 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 60 [2019-01-20 09:57:56,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:56,753 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2019-01-20 09:57:56,754 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-01-20 09:57:56,754 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2019-01-20 09:57:56,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-01-20 09:57:56,754 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:56,754 INFO L402 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1] [2019-01-20 09:57:56,754 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:56,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:56,755 INFO L82 PathProgramCache]: Analyzing trace with hash -228988683, now seen corresponding path program 29 times [2019-01-20 09:57:56,755 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:56,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:56,756 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:56,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:56,756 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:56,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:57,746 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2019-01-20 09:57:57,747 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:57,747 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:57,747 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:57,747 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:57,747 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:57,747 INFO L193 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 [2019-01-20 09:57:57,755 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:57:57,755 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:57:57,947 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-01-20 09:57:57,947 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:57,951 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:57,960 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2019-01-20 09:57:57,960 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:58,938 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2019-01-20 09:57:58,960 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:58,960 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 32, 32] total 62 [2019-01-20 09:57:58,961 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:58,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-01-20 09:57:58,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-01-20 09:57:58,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2019-01-20 09:57:58,962 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 32 states. [2019-01-20 09:57:59,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:59,036 INFO L93 Difference]: Finished difference Result 97 states and 100 transitions. [2019-01-20 09:57:59,036 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-01-20 09:57:59,036 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 62 [2019-01-20 09:57:59,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:59,037 INFO L225 Difference]: With dead ends: 97 [2019-01-20 09:57:59,037 INFO L226 Difference]: Without dead ends: 65 [2019-01-20 09:57:59,038 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2019-01-20 09:57:59,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-01-20 09:57:59,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2019-01-20 09:57:59,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-01-20 09:57:59,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2019-01-20 09:57:59,042 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 62 [2019-01-20 09:57:59,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:59,042 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2019-01-20 09:57:59,042 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-01-20 09:57:59,043 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2019-01-20 09:57:59,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-01-20 09:57:59,043 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:59,043 INFO L402 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1] [2019-01-20 09:57:59,043 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:59,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:59,044 INFO L82 PathProgramCache]: Analyzing trace with hash -785494358, now seen corresponding path program 30 times [2019-01-20 09:57:59,044 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:59,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:59,044 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:59,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:59,045 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:59,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:59,773 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-01-20 09:57:59,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:59,773 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:59,773 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:59,773 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:59,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:59,774 INFO L193 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 [2019-01-20 09:57:59,787 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:57:59,787 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:57:59,824 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:57:59,825 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:59,828 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:59,837 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-01-20 09:57:59,838 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:00,917 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-01-20 09:58:00,936 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:00,937 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2019-01-20 09:58:00,937 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:00,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-01-20 09:58:00,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-01-20 09:58:00,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2019-01-20 09:58:00,938 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand 33 states. [2019-01-20 09:58:01,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:01,056 INFO L93 Difference]: Finished difference Result 100 states and 103 transitions. [2019-01-20 09:58:01,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-01-20 09:58:01,057 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 64 [2019-01-20 09:58:01,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:01,058 INFO L225 Difference]: With dead ends: 100 [2019-01-20 09:58:01,058 INFO L226 Difference]: Without dead ends: 67 [2019-01-20 09:58:01,059 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2019-01-20 09:58:01,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-01-20 09:58:01,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2019-01-20 09:58:01,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-01-20 09:58:01,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2019-01-20 09:58:01,063 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 64 [2019-01-20 09:58:01,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:01,063 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2019-01-20 09:58:01,063 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-01-20 09:58:01,063 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2019-01-20 09:58:01,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2019-01-20 09:58:01,064 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:01,064 INFO L402 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1] [2019-01-20 09:58:01,064 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:01,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:01,064 INFO L82 PathProgramCache]: Analyzing trace with hash -429274795, now seen corresponding path program 31 times [2019-01-20 09:58:01,065 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:01,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:01,065 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:58:01,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:01,066 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:01,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:01,657 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2019-01-20 09:58:01,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:01,657 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:01,657 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:01,658 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:01,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:01,658 INFO L193 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 [2019-01-20 09:58:01,670 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:58:01,670 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:58:01,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:01,716 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:01,726 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2019-01-20 09:58:01,726 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:02,889 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2019-01-20 09:58:02,908 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:02,908 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2019-01-20 09:58:02,909 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:02,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-01-20 09:58:02,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-01-20 09:58:02,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2145, Invalid=2145, Unknown=0, NotChecked=0, Total=4290 [2019-01-20 09:58:02,910 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 34 states. [2019-01-20 09:58:03,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:03,038 INFO L93 Difference]: Finished difference Result 103 states and 106 transitions. [2019-01-20 09:58:03,039 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-01-20 09:58:03,039 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 66 [2019-01-20 09:58:03,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:03,040 INFO L225 Difference]: With dead ends: 103 [2019-01-20 09:58:03,040 INFO L226 Difference]: Without dead ends: 69 [2019-01-20 09:58:03,041 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2145, Invalid=2145, Unknown=0, NotChecked=0, Total=4290 [2019-01-20 09:58:03,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2019-01-20 09:58:03,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2019-01-20 09:58:03,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2019-01-20 09:58:03,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2019-01-20 09:58:03,044 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 66 [2019-01-20 09:58:03,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:03,044 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2019-01-20 09:58:03,044 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-01-20 09:58:03,044 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2019-01-20 09:58:03,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-01-20 09:58:03,045 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:03,045 INFO L402 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1] [2019-01-20 09:58:03,045 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:03,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:03,045 INFO L82 PathProgramCache]: Analyzing trace with hash 1040014794, now seen corresponding path program 32 times [2019-01-20 09:58:03,045 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:03,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:03,046 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:58:03,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:03,046 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:03,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:03,600 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2019-01-20 09:58:03,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:03,601 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:03,601 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:03,601 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:03,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:03,601 INFO L193 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 [2019-01-20 09:58:03,609 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:58:03,609 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:58:03,847 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2019-01-20 09:58:03,848 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:58:03,852 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:03,864 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2019-01-20 09:58:03,864 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:05,445 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2019-01-20 09:58:05,464 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:05,464 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2019-01-20 09:58:05,464 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:05,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-01-20 09:58:05,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-01-20 09:58:05,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2019-01-20 09:58:05,466 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 35 states. [2019-01-20 09:58:05,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:05,620 INFO L93 Difference]: Finished difference Result 106 states and 109 transitions. [2019-01-20 09:58:05,620 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-01-20 09:58:05,620 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 68 [2019-01-20 09:58:05,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:05,621 INFO L225 Difference]: With dead ends: 106 [2019-01-20 09:58:05,621 INFO L226 Difference]: Without dead ends: 71 [2019-01-20 09:58:05,622 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2019-01-20 09:58:05,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-01-20 09:58:05,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2019-01-20 09:58:05,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2019-01-20 09:58:05,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2019-01-20 09:58:05,626 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 68 [2019-01-20 09:58:05,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:05,626 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2019-01-20 09:58:05,626 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-01-20 09:58:05,626 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2019-01-20 09:58:05,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2019-01-20 09:58:05,626 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:05,627 INFO L402 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1] [2019-01-20 09:58:05,627 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:05,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:05,627 INFO L82 PathProgramCache]: Analyzing trace with hash -986406475, now seen corresponding path program 33 times [2019-01-20 09:58:05,627 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:05,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:05,628 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:58:05,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:05,628 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:05,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:06,300 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2019-01-20 09:58:06,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:06,301 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:06,301 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:06,301 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:06,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:06,301 INFO L193 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 [2019-01-20 09:58:06,309 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:58:06,310 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:58:06,350 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:58:06,350 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:58:06,353 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:06,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2019-01-20 09:58:06,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:07,589 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2019-01-20 09:58:07,607 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:07,607 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2019-01-20 09:58:07,607 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:07,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-01-20 09:58:07,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-01-20 09:58:07,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2019-01-20 09:58:07,609 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand 36 states. [2019-01-20 09:58:07,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:07,770 INFO L93 Difference]: Finished difference Result 109 states and 112 transitions. [2019-01-20 09:58:07,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-01-20 09:58:07,770 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 70 [2019-01-20 09:58:07,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:07,771 INFO L225 Difference]: With dead ends: 109 [2019-01-20 09:58:07,771 INFO L226 Difference]: Without dead ends: 73 [2019-01-20 09:58:07,772 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2019-01-20 09:58:07,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-01-20 09:58:07,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2019-01-20 09:58:07,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-01-20 09:58:07,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2019-01-20 09:58:07,775 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 70 [2019-01-20 09:58:07,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:07,775 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2019-01-20 09:58:07,776 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-01-20 09:58:07,776 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2019-01-20 09:58:07,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-01-20 09:58:07,776 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:07,776 INFO L402 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1] [2019-01-20 09:58:07,777 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:07,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:07,777 INFO L82 PathProgramCache]: Analyzing trace with hash 1548924138, now seen corresponding path program 34 times [2019-01-20 09:58:07,777 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:07,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:07,778 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:58:07,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:07,778 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:07,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:08,328 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2019-01-20 09:58:08,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:08,328 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:08,329 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:08,329 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:08,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:08,329 INFO L193 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 [2019-01-20 09:58:08,340 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:58:08,340 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:58:08,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:08,384 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:08,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2019-01-20 09:58:08,395 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:09,971 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2019-01-20 09:58:09,989 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:09,989 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2019-01-20 09:58:09,989 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:09,989 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-01-20 09:58:09,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-01-20 09:58:09,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2019-01-20 09:58:09,990 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand 37 states. [2019-01-20 09:58:10,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:10,145 INFO L93 Difference]: Finished difference Result 112 states and 115 transitions. [2019-01-20 09:58:10,146 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-01-20 09:58:10,146 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 72 [2019-01-20 09:58:10,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:10,147 INFO L225 Difference]: With dead ends: 112 [2019-01-20 09:58:10,147 INFO L226 Difference]: Without dead ends: 75 [2019-01-20 09:58:10,147 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2019-01-20 09:58:10,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-01-20 09:58:10,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2019-01-20 09:58:10,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2019-01-20 09:58:10,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2019-01-20 09:58:10,151 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 72 [2019-01-20 09:58:10,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:10,151 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2019-01-20 09:58:10,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-01-20 09:58:10,151 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2019-01-20 09:58:10,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2019-01-20 09:58:10,151 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:10,152 INFO L402 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1] [2019-01-20 09:58:10,152 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:10,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:10,152 INFO L82 PathProgramCache]: Analyzing trace with hash -1198231019, now seen corresponding path program 35 times [2019-01-20 09:58:10,152 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:10,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:10,153 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:58:10,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:10,153 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:10,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:11,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2019-01-20 09:58:11,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:11,105 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:11,105 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:11,105 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:11,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:11,105 INFO L193 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 [2019-01-20 09:58:11,113 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:58:11,113 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:58:11,529 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2019-01-20 09:58:11,529 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:58:11,536 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:11,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2019-01-20 09:58:11,547 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:12,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2019-01-20 09:58:12,940 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:12,941 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2019-01-20 09:58:12,941 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:12,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-01-20 09:58:12,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-01-20 09:58:12,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2019-01-20 09:58:12,942 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 38 states. [2019-01-20 09:58:13,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:13,080 INFO L93 Difference]: Finished difference Result 115 states and 118 transitions. [2019-01-20 09:58:13,080 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-01-20 09:58:13,080 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 74 [2019-01-20 09:58:13,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:13,081 INFO L225 Difference]: With dead ends: 115 [2019-01-20 09:58:13,081 INFO L226 Difference]: Without dead ends: 77 [2019-01-20 09:58:13,082 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2019-01-20 09:58:13,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-01-20 09:58:13,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2019-01-20 09:58:13,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-01-20 09:58:13,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2019-01-20 09:58:13,085 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 74 [2019-01-20 09:58:13,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:13,085 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2019-01-20 09:58:13,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-01-20 09:58:13,085 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2019-01-20 09:58:13,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2019-01-20 09:58:13,085 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:13,086 INFO L402 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1] [2019-01-20 09:58:13,086 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:13,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:13,086 INFO L82 PathProgramCache]: Analyzing trace with hash -2106305526, now seen corresponding path program 36 times [2019-01-20 09:58:13,086 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:13,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:13,087 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:58:13,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:13,087 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:13,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:13,756 INFO L134 CoverageAnalysis]: Checked inductivity of 1332 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2019-01-20 09:58:13,756 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:13,756 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:13,757 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:13,757 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:13,757 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:13,757 INFO L193 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 [2019-01-20 09:58:13,770 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:58:13,771 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:58:13,823 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:58:13,824 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:58:13,826 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:13,837 INFO L134 CoverageAnalysis]: Checked inductivity of 1332 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2019-01-20 09:58:13,838 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:15,876 INFO L134 CoverageAnalysis]: Checked inductivity of 1332 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2019-01-20 09:58:15,894 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:15,894 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2019-01-20 09:58:15,895 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:15,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-01-20 09:58:15,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-01-20 09:58:15,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2019-01-20 09:58:15,896 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand 39 states. [2019-01-20 09:58:16,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:16,030 INFO L93 Difference]: Finished difference Result 118 states and 121 transitions. [2019-01-20 09:58:16,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-01-20 09:58:16,030 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 76 [2019-01-20 09:58:16,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:16,031 INFO L225 Difference]: With dead ends: 118 [2019-01-20 09:58:16,031 INFO L226 Difference]: Without dead ends: 79 [2019-01-20 09:58:16,032 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2019-01-20 09:58:16,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-01-20 09:58:16,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2019-01-20 09:58:16,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-01-20 09:58:16,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2019-01-20 09:58:16,035 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 76 [2019-01-20 09:58:16,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:16,035 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2019-01-20 09:58:16,035 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-01-20 09:58:16,035 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2019-01-20 09:58:16,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-01-20 09:58:16,036 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:16,036 INFO L402 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1] [2019-01-20 09:58:16,036 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:16,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:16,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1075627403, now seen corresponding path program 37 times [2019-01-20 09:58:16,037 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:16,037 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:16,037 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:58:16,037 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:16,037 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:16,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:17,054 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2019-01-20 09:58:17,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:17,054 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:17,054 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:17,054 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:17,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:17,055 INFO L193 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 [2019-01-20 09:58:17,063 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:58:17,063 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:58:17,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:17,114 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:17,124 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2019-01-20 09:58:17,124 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:18,641 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2019-01-20 09:58:18,660 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:18,661 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2019-01-20 09:58:18,661 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:18,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-01-20 09:58:18,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-01-20 09:58:18,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3003, Invalid=3003, Unknown=0, NotChecked=0, Total=6006 [2019-01-20 09:58:18,662 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 40 states. [2019-01-20 09:58:18,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:18,790 INFO L93 Difference]: Finished difference Result 121 states and 124 transitions. [2019-01-20 09:58:18,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2019-01-20 09:58:18,790 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 78 [2019-01-20 09:58:18,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:18,791 INFO L225 Difference]: With dead ends: 121 [2019-01-20 09:58:18,791 INFO L226 Difference]: Without dead ends: 81 [2019-01-20 09:58:18,792 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3003, Invalid=3003, Unknown=0, NotChecked=0, Total=6006 [2019-01-20 09:58:18,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2019-01-20 09:58:18,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2019-01-20 09:58:18,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2019-01-20 09:58:18,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2019-01-20 09:58:18,796 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 78 [2019-01-20 09:58:18,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:18,796 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2019-01-20 09:58:18,796 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-01-20 09:58:18,796 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2019-01-20 09:58:18,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2019-01-20 09:58:18,797 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:18,797 INFO L402 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1] [2019-01-20 09:58:18,797 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:18,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:18,797 INFO L82 PathProgramCache]: Analyzing trace with hash 1898461994, now seen corresponding path program 38 times [2019-01-20 09:58:18,797 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:18,798 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:18,798 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:58:18,798 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:18,798 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:18,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:19,451 INFO L134 CoverageAnalysis]: Checked inductivity of 1482 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2019-01-20 09:58:19,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:19,451 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:19,452 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:19,452 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:19,452 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:19,452 INFO L193 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 [2019-01-20 09:58:19,461 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:58:19,461 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:58:19,970 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2019-01-20 09:58:19,970 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:58:19,976 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:19,988 INFO L134 CoverageAnalysis]: Checked inductivity of 1482 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2019-01-20 09:58:19,989 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:21,777 INFO L134 CoverageAnalysis]: Checked inductivity of 1482 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2019-01-20 09:58:21,797 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:21,797 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2019-01-20 09:58:21,797 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:21,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2019-01-20 09:58:21,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2019-01-20 09:58:21,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2019-01-20 09:58:21,798 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand 41 states. [2019-01-20 09:58:21,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:21,937 INFO L93 Difference]: Finished difference Result 124 states and 127 transitions. [2019-01-20 09:58:21,937 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2019-01-20 09:58:21,937 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 80 [2019-01-20 09:58:21,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:21,938 INFO L225 Difference]: With dead ends: 124 [2019-01-20 09:58:21,938 INFO L226 Difference]: Without dead ends: 83 [2019-01-20 09:58:21,939 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2019-01-20 09:58:21,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-01-20 09:58:21,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2019-01-20 09:58:21,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-01-20 09:58:21,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2019-01-20 09:58:21,943 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 80 [2019-01-20 09:58:21,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:21,943 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2019-01-20 09:58:21,943 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2019-01-20 09:58:21,943 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2019-01-20 09:58:21,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2019-01-20 09:58:21,944 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:21,944 INFO L402 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1] [2019-01-20 09:58:21,944 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:21,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:21,944 INFO L82 PathProgramCache]: Analyzing trace with hash 1341848277, now seen corresponding path program 39 times [2019-01-20 09:58:21,944 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:21,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:21,945 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:58:21,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:21,945 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:21,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:22,643 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2019-01-20 09:58:22,643 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:22,644 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:22,644 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:22,644 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:22,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:22,644 INFO L193 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 [2019-01-20 09:58:22,653 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:58:22,653 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:58:22,703 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:58:22,704 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:58:22,706 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:22,714 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2019-01-20 09:58:22,714 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:24,475 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2019-01-20 09:58:24,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:24,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2019-01-20 09:58:24,494 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:24,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2019-01-20 09:58:24,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2019-01-20 09:58:24,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2019-01-20 09:58:24,495 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand 42 states. [2019-01-20 09:58:24,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:24,642 INFO L93 Difference]: Finished difference Result 127 states and 130 transitions. [2019-01-20 09:58:24,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-01-20 09:58:24,642 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 82 [2019-01-20 09:58:24,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:24,643 INFO L225 Difference]: With dead ends: 127 [2019-01-20 09:58:24,643 INFO L226 Difference]: Without dead ends: 85 [2019-01-20 09:58:24,644 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2019-01-20 09:58:24,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2019-01-20 09:58:24,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2019-01-20 09:58:24,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2019-01-20 09:58:24,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2019-01-20 09:58:24,648 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 82 [2019-01-20 09:58:24,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:24,648 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2019-01-20 09:58:24,648 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2019-01-20 09:58:24,648 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2019-01-20 09:58:24,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-01-20 09:58:24,649 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:24,649 INFO L402 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1] [2019-01-20 09:58:24,649 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:24,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:24,650 INFO L82 PathProgramCache]: Analyzing trace with hash -1280021942, now seen corresponding path program 40 times [2019-01-20 09:58:24,650 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:24,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:24,650 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:58:24,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:24,651 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:24,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:25,897 INFO L134 CoverageAnalysis]: Checked inductivity of 1640 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 820 trivial. 0 not checked. [2019-01-20 09:58:25,897 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:25,897 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:25,897 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:25,898 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:25,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:25,898 INFO L193 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 [2019-01-20 09:58:25,906 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:58:25,906 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:58:25,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:25,961 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:25,974 INFO L134 CoverageAnalysis]: Checked inductivity of 1640 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 820 trivial. 0 not checked. [2019-01-20 09:58:25,974 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:27,887 INFO L134 CoverageAnalysis]: Checked inductivity of 1640 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 820 trivial. 0 not checked. [2019-01-20 09:58:27,905 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:27,906 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 83 [2019-01-20 09:58:27,906 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:27,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-01-20 09:58:27,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-01-20 09:58:27,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2019-01-20 09:58:27,907 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand 43 states. [2019-01-20 09:58:28,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:28,054 INFO L93 Difference]: Finished difference Result 130 states and 133 transitions. [2019-01-20 09:58:28,054 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2019-01-20 09:58:28,054 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 84 [2019-01-20 09:58:28,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:28,055 INFO L225 Difference]: With dead ends: 130 [2019-01-20 09:58:28,056 INFO L226 Difference]: Without dead ends: 87 [2019-01-20 09:58:28,056 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2019-01-20 09:58:28,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2019-01-20 09:58:28,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2019-01-20 09:58:28,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2019-01-20 09:58:28,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2019-01-20 09:58:28,061 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 84 [2019-01-20 09:58:28,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:28,061 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2019-01-20 09:58:28,061 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2019-01-20 09:58:28,062 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2019-01-20 09:58:28,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-01-20 09:58:28,062 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:28,062 INFO L402 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1] [2019-01-20 09:58:28,062 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:28,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:28,063 INFO L82 PathProgramCache]: Analyzing trace with hash -214584523, now seen corresponding path program 41 times [2019-01-20 09:58:28,063 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:28,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:28,064 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:58:28,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:28,064 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:28,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:29,194 INFO L134 CoverageAnalysis]: Checked inductivity of 1722 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2019-01-20 09:58:29,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:29,194 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:29,195 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:29,195 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:29,195 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:29,195 INFO L193 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 [2019-01-20 09:58:29,204 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:58:29,204 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:58:29,818 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2019-01-20 09:58:29,818 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:58:29,824 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:29,836 INFO L134 CoverageAnalysis]: Checked inductivity of 1722 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2019-01-20 09:58:29,837 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:31,896 INFO L134 CoverageAnalysis]: Checked inductivity of 1722 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2019-01-20 09:58:31,916 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:31,916 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2019-01-20 09:58:31,916 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:31,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-01-20 09:58:31,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-01-20 09:58:31,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2019-01-20 09:58:31,918 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 44 states. [2019-01-20 09:58:32,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:32,060 INFO L93 Difference]: Finished difference Result 133 states and 136 transitions. [2019-01-20 09:58:32,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-01-20 09:58:32,060 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 86 [2019-01-20 09:58:32,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:32,061 INFO L225 Difference]: With dead ends: 133 [2019-01-20 09:58:32,061 INFO L226 Difference]: Without dead ends: 89 [2019-01-20 09:58:32,062 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2019-01-20 09:58:32,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-01-20 09:58:32,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2019-01-20 09:58:32,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2019-01-20 09:58:32,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2019-01-20 09:58:32,066 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 86 [2019-01-20 09:58:32,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:32,066 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2019-01-20 09:58:32,066 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-01-20 09:58:32,066 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2019-01-20 09:58:32,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-01-20 09:58:32,067 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:32,067 INFO L402 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1] [2019-01-20 09:58:32,067 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:32,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:32,067 INFO L82 PathProgramCache]: Analyzing trace with hash -2170518, now seen corresponding path program 42 times [2019-01-20 09:58:32,067 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:32,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:32,068 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:58:32,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:32,068 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:32,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:33,012 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2019-01-20 09:58:33,012 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:33,012 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:33,012 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:33,013 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:33,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:33,013 INFO L193 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 [2019-01-20 09:58:33,031 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:58:33,031 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:58:33,086 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:58:33,086 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:58:33,089 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:33,101 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2019-01-20 09:58:33,101 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:35,071 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2019-01-20 09:58:35,089 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:35,089 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2019-01-20 09:58:35,090 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:35,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2019-01-20 09:58:35,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2019-01-20 09:58:35,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2019-01-20 09:58:35,091 INFO L87 Difference]: Start difference. First operand 89 states and 90 transitions. Second operand 45 states. [2019-01-20 09:58:35,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:35,300 INFO L93 Difference]: Finished difference Result 136 states and 139 transitions. [2019-01-20 09:58:35,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2019-01-20 09:58:35,301 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 88 [2019-01-20 09:58:35,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:35,301 INFO L225 Difference]: With dead ends: 136 [2019-01-20 09:58:35,301 INFO L226 Difference]: Without dead ends: 91 [2019-01-20 09:58:35,302 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2019-01-20 09:58:35,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-01-20 09:58:35,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2019-01-20 09:58:35,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-01-20 09:58:35,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2019-01-20 09:58:35,305 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 88 [2019-01-20 09:58:35,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:35,305 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2019-01-20 09:58:35,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2019-01-20 09:58:35,306 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2019-01-20 09:58:35,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2019-01-20 09:58:35,306 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:35,306 INFO L402 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1] [2019-01-20 09:58:35,306 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:35,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:35,307 INFO L82 PathProgramCache]: Analyzing trace with hash -378707051, now seen corresponding path program 43 times [2019-01-20 09:58:35,307 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:35,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:35,308 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:58:35,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:35,308 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:35,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:36,265 INFO L134 CoverageAnalysis]: Checked inductivity of 1892 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2019-01-20 09:58:36,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:36,266 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:36,266 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:36,266 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:36,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:36,266 INFO L193 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 [2019-01-20 09:58:36,274 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:58:36,274 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:58:36,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:36,334 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:36,343 INFO L134 CoverageAnalysis]: Checked inductivity of 1892 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2019-01-20 09:58:36,343 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:38,373 INFO L134 CoverageAnalysis]: Checked inductivity of 1892 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2019-01-20 09:58:38,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:38,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 89 [2019-01-20 09:58:38,402 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:38,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-01-20 09:58:38,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-01-20 09:58:38,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4005, Invalid=4005, Unknown=0, NotChecked=0, Total=8010 [2019-01-20 09:58:38,403 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand 46 states. [2019-01-20 09:58:39,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:39,004 INFO L93 Difference]: Finished difference Result 139 states and 142 transitions. [2019-01-20 09:58:39,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-01-20 09:58:39,004 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 90 [2019-01-20 09:58:39,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:39,004 INFO L225 Difference]: With dead ends: 139 [2019-01-20 09:58:39,005 INFO L226 Difference]: Without dead ends: 93 [2019-01-20 09:58:39,005 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=4005, Invalid=4005, Unknown=0, NotChecked=0, Total=8010 [2019-01-20 09:58:39,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2019-01-20 09:58:39,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2019-01-20 09:58:39,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2019-01-20 09:58:39,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2019-01-20 09:58:39,008 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 90 [2019-01-20 09:58:39,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:39,009 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2019-01-20 09:58:39,009 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2019-01-20 09:58:39,009 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2019-01-20 09:58:39,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2019-01-20 09:58:39,009 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:39,009 INFO L402 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1] [2019-01-20 09:58:39,010 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:39,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:39,010 INFO L82 PathProgramCache]: Analyzing trace with hash -1779588982, now seen corresponding path program 44 times [2019-01-20 09:58:39,010 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:39,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:39,010 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:58:39,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:39,011 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:39,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:40,369 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2019-01-20 09:58:40,369 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:40,369 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:40,369 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:40,370 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:40,370 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:40,370 INFO L193 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 [2019-01-20 09:58:40,377 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:58:40,377 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:58:41,125 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2019-01-20 09:58:41,125 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:58:41,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:41,144 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2019-01-20 09:58:41,144 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:43,294 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2019-01-20 09:58:43,315 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:43,315 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 47, 47] total 92 [2019-01-20 09:58:43,315 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:43,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-01-20 09:58:43,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-01-20 09:58:43,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2019-01-20 09:58:43,316 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand 47 states. [2019-01-20 09:58:44,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:44,096 INFO L93 Difference]: Finished difference Result 142 states and 145 transitions. [2019-01-20 09:58:44,096 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-01-20 09:58:44,096 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 92 [2019-01-20 09:58:44,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:44,097 INFO L225 Difference]: With dead ends: 142 [2019-01-20 09:58:44,097 INFO L226 Difference]: Without dead ends: 95 [2019-01-20 09:58:44,098 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2019-01-20 09:58:44,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2019-01-20 09:58:44,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2019-01-20 09:58:44,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2019-01-20 09:58:44,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 96 transitions. [2019-01-20 09:58:44,101 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 96 transitions. Word has length 92 [2019-01-20 09:58:44,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:44,102 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 96 transitions. [2019-01-20 09:58:44,102 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-01-20 09:58:44,102 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 96 transitions. [2019-01-20 09:58:44,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2019-01-20 09:58:44,102 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:44,102 INFO L402 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1] [2019-01-20 09:58:44,102 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:44,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:44,103 INFO L82 PathProgramCache]: Analyzing trace with hash -939783179, now seen corresponding path program 45 times [2019-01-20 09:58:44,103 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:44,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:44,103 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:58:44,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:44,104 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:44,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:45,116 INFO L134 CoverageAnalysis]: Checked inductivity of 2070 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2019-01-20 09:58:45,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:45,117 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:45,117 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:45,117 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:45,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:45,117 INFO L193 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 [2019-01-20 09:58:45,129 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:58:45,129 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:58:45,206 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:58:45,206 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:58:45,210 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:45,223 INFO L134 CoverageAnalysis]: Checked inductivity of 2070 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2019-01-20 09:58:45,223 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:47,796 INFO L134 CoverageAnalysis]: Checked inductivity of 2070 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2019-01-20 09:58:47,814 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:47,814 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2019-01-20 09:58:47,814 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:47,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2019-01-20 09:58:47,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2019-01-20 09:58:47,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2019-01-20 09:58:47,815 INFO L87 Difference]: Start difference. First operand 95 states and 96 transitions. Second operand 48 states. [2019-01-20 09:58:47,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:48,000 INFO L93 Difference]: Finished difference Result 145 states and 148 transitions. [2019-01-20 09:58:48,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-01-20 09:58:48,000 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 94 [2019-01-20 09:58:48,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:48,001 INFO L225 Difference]: With dead ends: 145 [2019-01-20 09:58:48,001 INFO L226 Difference]: Without dead ends: 97 [2019-01-20 09:58:48,002 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2019-01-20 09:58:48,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2019-01-20 09:58:48,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2019-01-20 09:58:48,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2019-01-20 09:58:48,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2019-01-20 09:58:48,005 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 94 [2019-01-20 09:58:48,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:48,006 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2019-01-20 09:58:48,006 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2019-01-20 09:58:48,006 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2019-01-20 09:58:48,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2019-01-20 09:58:48,006 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:48,006 INFO L402 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1] [2019-01-20 09:58:48,006 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:48,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:48,007 INFO L82 PathProgramCache]: Analyzing trace with hash -1599690838, now seen corresponding path program 46 times [2019-01-20 09:58:48,007 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:48,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:48,007 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:58:48,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:48,008 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:48,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:48,989 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2019-01-20 09:58:48,989 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:48,989 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:48,989 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:48,989 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:48,989 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:48,989 INFO L193 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 [2019-01-20 09:58:48,998 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:58:48,998 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:58:49,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:49,058 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:49,074 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2019-01-20 09:58:49,074 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:51,580 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2019-01-20 09:58:51,598 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:51,598 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2019-01-20 09:58:51,598 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:51,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2019-01-20 09:58:51,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2019-01-20 09:58:51,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2019-01-20 09:58:51,600 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 49 states. [2019-01-20 09:58:51,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:51,862 INFO L93 Difference]: Finished difference Result 148 states and 151 transitions. [2019-01-20 09:58:51,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2019-01-20 09:58:51,862 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 96 [2019-01-20 09:58:51,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:51,863 INFO L225 Difference]: With dead ends: 148 [2019-01-20 09:58:51,863 INFO L226 Difference]: Without dead ends: 99 [2019-01-20 09:58:51,864 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2019-01-20 09:58:51,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2019-01-20 09:58:51,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2019-01-20 09:58:51,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2019-01-20 09:58:51,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2019-01-20 09:58:51,867 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 96 [2019-01-20 09:58:51,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:51,868 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2019-01-20 09:58:51,868 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2019-01-20 09:58:51,868 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2019-01-20 09:58:51,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2019-01-20 09:58:51,868 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:51,868 INFO L402 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1] [2019-01-20 09:58:51,869 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:51,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:51,869 INFO L82 PathProgramCache]: Analyzing trace with hash 431729749, now seen corresponding path program 47 times [2019-01-20 09:58:51,869 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:51,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:51,870 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:58:51,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:51,870 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:51,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:58:53,296 INFO L134 CoverageAnalysis]: Checked inductivity of 2256 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 1128 trivial. 0 not checked. [2019-01-20 09:58:53,297 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:53,297 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:58:53,297 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:58:53,297 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:58:53,297 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:58:53,297 INFO L193 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 [2019-01-20 09:58:53,307 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:58:53,307 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:58:54,955 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2019-01-20 09:58:54,955 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:58:54,964 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:58:54,980 INFO L134 CoverageAnalysis]: Checked inductivity of 2256 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 1128 trivial. 0 not checked. [2019-01-20 09:58:54,980 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:58:58,110 INFO L134 CoverageAnalysis]: Checked inductivity of 2256 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 1128 trivial. 0 not checked. [2019-01-20 09:58:58,131 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:58:58,132 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2019-01-20 09:58:58,132 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:58:58,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2019-01-20 09:58:58,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2019-01-20 09:58:58,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2019-01-20 09:58:58,133 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand 50 states. [2019-01-20 09:58:58,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:58:58,501 INFO L93 Difference]: Finished difference Result 151 states and 154 transitions. [2019-01-20 09:58:58,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-01-20 09:58:58,501 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 98 [2019-01-20 09:58:58,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:58:58,502 INFO L225 Difference]: With dead ends: 151 [2019-01-20 09:58:58,502 INFO L226 Difference]: Without dead ends: 101 [2019-01-20 09:58:58,503 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2019-01-20 09:58:58,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2019-01-20 09:58:58,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2019-01-20 09:58:58,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2019-01-20 09:58:58,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 102 transitions. [2019-01-20 09:58:58,507 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 102 transitions. Word has length 98 [2019-01-20 09:58:58,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:58:58,507 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 102 transitions. [2019-01-20 09:58:58,507 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2019-01-20 09:58:58,507 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 102 transitions. [2019-01-20 09:58:58,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2019-01-20 09:58:58,508 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:58:58,508 INFO L402 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1] [2019-01-20 09:58:58,508 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:58:58,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:58:58,508 INFO L82 PathProgramCache]: Analyzing trace with hash -1789921590, now seen corresponding path program 48 times [2019-01-20 09:58:58,509 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:58:58,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:58,509 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:58:58,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:58:58,509 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:58:58,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:59:00,050 INFO L134 CoverageAnalysis]: Checked inductivity of 2352 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2019-01-20 09:59:00,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:59:00,050 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:59:00,050 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:59:00,050 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:59:00,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:59:00,050 INFO L193 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 [2019-01-20 09:59:00,059 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:59:00,059 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:59:00,118 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:59:00,118 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:59:00,122 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:59:00,134 INFO L134 CoverageAnalysis]: Checked inductivity of 2352 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2019-01-20 09:59:00,134 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:59:02,829 INFO L134 CoverageAnalysis]: Checked inductivity of 2352 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2019-01-20 09:59:02,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:59:02,847 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 99 [2019-01-20 09:59:02,848 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:59:02,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2019-01-20 09:59:02,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2019-01-20 09:59:02,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2019-01-20 09:59:02,849 INFO L87 Difference]: Start difference. First operand 101 states and 102 transitions. Second operand 51 states. [2019-01-20 09:59:03,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:59:03,115 INFO L93 Difference]: Finished difference Result 154 states and 157 transitions. [2019-01-20 09:59:03,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-01-20 09:59:03,116 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 100 [2019-01-20 09:59:03,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:59:03,116 INFO L225 Difference]: With dead ends: 154 [2019-01-20 09:59:03,117 INFO L226 Difference]: Without dead ends: 103 [2019-01-20 09:59:03,118 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2019-01-20 09:59:03,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2019-01-20 09:59:03,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2019-01-20 09:59:03,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2019-01-20 09:59:03,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2019-01-20 09:59:03,121 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 100 [2019-01-20 09:59:03,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:59:03,122 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2019-01-20 09:59:03,122 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2019-01-20 09:59:03,122 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2019-01-20 09:59:03,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2019-01-20 09:59:03,122 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:59:03,122 INFO L402 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1] [2019-01-20 09:59:03,122 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:59:03,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:59:03,123 INFO L82 PathProgramCache]: Analyzing trace with hash -16366411, now seen corresponding path program 49 times [2019-01-20 09:59:03,123 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:59:03,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:59:03,123 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:59:03,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:59:03,124 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:59:03,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:59:04,610 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2019-01-20 09:59:04,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:59:04,610 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:59:04,610 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:59:04,610 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:59:04,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:59:04,611 INFO L193 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 [2019-01-20 09:59:04,621 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:59:04,621 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:59:04,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:59:04,688 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:59:04,701 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2019-01-20 09:59:04,701 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:59:07,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2019-01-20 09:59:07,622 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:59:07,622 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 101 [2019-01-20 09:59:07,622 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:59:07,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2019-01-20 09:59:07,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2019-01-20 09:59:07,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2019-01-20 09:59:07,624 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand 52 states. [2019-01-20 09:59:07,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:59:07,834 INFO L93 Difference]: Finished difference Result 157 states and 160 transitions. [2019-01-20 09:59:07,835 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2019-01-20 09:59:07,835 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 102 [2019-01-20 09:59:07,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:59:07,835 INFO L225 Difference]: With dead ends: 157 [2019-01-20 09:59:07,836 INFO L226 Difference]: Without dead ends: 105 [2019-01-20 09:59:07,836 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2019-01-20 09:59:07,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2019-01-20 09:59:07,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2019-01-20 09:59:07,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2019-01-20 09:59:07,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 106 transitions. [2019-01-20 09:59:07,841 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 106 transitions. Word has length 102 [2019-01-20 09:59:07,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:59:07,841 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 106 transitions. [2019-01-20 09:59:07,841 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2019-01-20 09:59:07,841 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 106 transitions. [2019-01-20 09:59:07,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-01-20 09:59:07,842 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:59:07,842 INFO L402 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1] [2019-01-20 09:59:07,842 INFO L423 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:59:07,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:59:07,842 INFO L82 PathProgramCache]: Analyzing trace with hash -1817211414, now seen corresponding path program 50 times [2019-01-20 09:59:07,842 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:59:07,843 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:59:07,843 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:59:07,843 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:59:07,843 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:59:07,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:59:08,978 INFO L134 CoverageAnalysis]: Checked inductivity of 2550 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 1275 trivial. 0 not checked. [2019-01-20 09:59:08,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:59:08,978 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:59:08,979 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:59:08,979 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:59:08,979 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:59:08,979 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-01-20 09:59:08,989 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:59:08,989 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:59:10,042 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2019-01-20 09:59:10,042 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:59:10,052 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:59:10,068 INFO L134 CoverageAnalysis]: Checked inductivity of 2550 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 1275 trivial. 0 not checked. [2019-01-20 09:59:10,068 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:59:13,248 INFO L134 CoverageAnalysis]: Checked inductivity of 2550 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 1275 trivial. 0 not checked. [2019-01-20 09:59:13,269 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:59:13,269 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2019-01-20 09:59:13,269 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:59:13,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2019-01-20 09:59:13,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2019-01-20 09:59:13,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2019-01-20 09:59:13,271 INFO L87 Difference]: Start difference. First operand 105 states and 106 transitions. Second operand 53 states. [2019-01-20 09:59:13,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:59:13,592 INFO L93 Difference]: Finished difference Result 160 states and 163 transitions. [2019-01-20 09:59:13,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2019-01-20 09:59:13,592 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 104 [2019-01-20 09:59:13,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:59:13,593 INFO L225 Difference]: With dead ends: 160 [2019-01-20 09:59:13,593 INFO L226 Difference]: Without dead ends: 107 [2019-01-20 09:59:13,595 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2019-01-20 09:59:13,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2019-01-20 09:59:13,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2019-01-20 09:59:13,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2019-01-20 09:59:13,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2019-01-20 09:59:13,601 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 104 [2019-01-20 09:59:13,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:59:13,601 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2019-01-20 09:59:13,601 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2019-01-20 09:59:13,601 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2019-01-20 09:59:13,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2019-01-20 09:59:13,602 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:59:13,602 INFO L402 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1] [2019-01-20 09:59:13,609 INFO L423 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:59:13,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:59:13,609 INFO L82 PathProgramCache]: Analyzing trace with hash -843721451, now seen corresponding path program 51 times [2019-01-20 09:59:13,610 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:59:13,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:59:13,611 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:59:13,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:59:13,611 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:59:13,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:59:14,951 INFO L134 CoverageAnalysis]: Checked inductivity of 2652 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2019-01-20 09:59:14,952 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:59:14,952 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:59:14,952 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:59:14,952 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:59:14,952 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:59:14,952 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-01-20 09:59:14,960 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:59:14,961 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:59:15,028 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:59:15,029 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:59:15,031 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:59:15,044 INFO L134 CoverageAnalysis]: Checked inductivity of 2652 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2019-01-20 09:59:15,044 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:59:18,165 INFO L134 CoverageAnalysis]: Checked inductivity of 2652 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2019-01-20 09:59:18,183 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:59:18,183 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2019-01-20 09:59:18,183 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:59:18,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2019-01-20 09:59:18,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2019-01-20 09:59:18,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2019-01-20 09:59:18,185 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand 54 states. [2019-01-20 09:59:18,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:59:18,426 INFO L93 Difference]: Finished difference Result 163 states and 166 transitions. [2019-01-20 09:59:18,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2019-01-20 09:59:18,427 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 106 [2019-01-20 09:59:18,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:59:18,427 INFO L225 Difference]: With dead ends: 163 [2019-01-20 09:59:18,428 INFO L226 Difference]: Without dead ends: 109 [2019-01-20 09:59:18,428 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2019-01-20 09:59:18,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2019-01-20 09:59:18,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2019-01-20 09:59:18,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2019-01-20 09:59:18,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2019-01-20 09:59:18,433 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 106 [2019-01-20 09:59:18,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:59:18,433 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2019-01-20 09:59:18,434 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2019-01-20 09:59:18,434 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2019-01-20 09:59:18,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2019-01-20 09:59:18,434 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:59:18,434 INFO L402 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1] [2019-01-20 09:59:18,435 INFO L423 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:59:18,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:59:18,435 INFO L82 PathProgramCache]: Analyzing trace with hash -972329718, now seen corresponding path program 52 times [2019-01-20 09:59:18,435 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:59:18,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:59:18,436 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:59:18,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:59:18,436 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:59:18,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:59:19,902 INFO L134 CoverageAnalysis]: Checked inductivity of 2756 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 1378 trivial. 0 not checked. [2019-01-20 09:59:19,903 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:59:19,903 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:59:19,903 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:59:19,903 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:59:19,903 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:59:19,903 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-01-20 09:59:19,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:59:19,912 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:59:19,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:59:19,982 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:59:19,994 INFO L134 CoverageAnalysis]: Checked inductivity of 2756 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 1378 trivial. 0 not checked. [2019-01-20 09:59:19,994 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:59:23,189 INFO L134 CoverageAnalysis]: Checked inductivity of 2756 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 1378 trivial. 0 not checked. [2019-01-20 09:59:23,207 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:59:23,207 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 107 [2019-01-20 09:59:23,207 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:59:23,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2019-01-20 09:59:23,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2019-01-20 09:59:23,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5778, Invalid=5778, Unknown=0, NotChecked=0, Total=11556 [2019-01-20 09:59:23,209 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 55 states. [2019-01-20 09:59:23,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:59:23,462 INFO L93 Difference]: Finished difference Result 166 states and 169 transitions. [2019-01-20 09:59:23,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-01-20 09:59:23,462 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 108 [2019-01-20 09:59:23,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:59:23,463 INFO L225 Difference]: With dead ends: 166 [2019-01-20 09:59:23,463 INFO L226 Difference]: Without dead ends: 111 [2019-01-20 09:59:23,464 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=5778, Invalid=5778, Unknown=0, NotChecked=0, Total=11556 [2019-01-20 09:59:23,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2019-01-20 09:59:23,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2019-01-20 09:59:23,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2019-01-20 09:59:23,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 112 transitions. [2019-01-20 09:59:23,467 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 112 transitions. Word has length 108 [2019-01-20 09:59:23,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:59:23,467 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 112 transitions. [2019-01-20 09:59:23,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2019-01-20 09:59:23,467 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 112 transitions. [2019-01-20 09:59:23,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2019-01-20 09:59:23,468 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:59:23,468 INFO L402 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1] [2019-01-20 09:59:23,468 INFO L423 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:59:23,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:59:23,468 INFO L82 PathProgramCache]: Analyzing trace with hash -1323016843, now seen corresponding path program 53 times [2019-01-20 09:59:23,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:59:23,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:59:23,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:59:23,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:59:23,469 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:59:23,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:59:25,282 INFO L134 CoverageAnalysis]: Checked inductivity of 2862 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 1431 trivial. 0 not checked. [2019-01-20 09:59:25,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:59:25,283 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:59:25,283 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:59:25,283 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:59:25,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:59:25,283 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-01-20 09:59:25,294 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:59:25,294 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:59:26,772 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2019-01-20 09:59:26,772 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:59:26,782 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:59:26,797 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-01-20 09:59:26,798 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-20 09:59:26,814 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-20 09:59:26,814 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2019-01-20 09:59:59,455 WARN L194 Executor]: External (z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000) stderr output: (error "out of memory") [2019-01-20 09:59:59,655 WARN L521 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-01-20 09:59:59,657 FATAL L265 ToolchainWalker]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000)Received EOF on stdin. stderr output: (error "out of memory") at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:208) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parseCheckSatResult(Executor.java:225) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.checkSat(Scriptor.java:155) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.WrapperScript.checkSat(WrapperScript.java:116) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.managedscript.ManagedScript.checkSat(ManagedScript.java:141) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.MonolithicImplicationChecker.checkImplication(MonolithicImplicationChecker.java:84) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.predicates.PredicateUnifier$PredicateComparison.compare(PredicateUnifier.java:934) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.predicates.PredicateUnifier$PredicateComparison.(PredicateUnifier.java:773) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate(PredicateUnifier.java:345) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate(PredicateUnifier.java:305) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.singletracecheck.TraceCheckSpWp$UnifyPostprocessor.postprocess(TraceCheckSpWp.java:575) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.predicates.IterativePredicateTransformer.applyPostprocessors(IterativePredicateTransformer.java:439) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.predicates.IterativePredicateTransformer.computeStrongestPostconditionSequence(IterativePredicateTransformer.java:200) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.singletracecheck.TraceCheckSpWp.computeInterpolantsUsingUnsatCore(TraceCheckSpWp.java:286) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.singletracecheck.TraceCheckSpWp.computeInterpolants(TraceCheckSpWp.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:162) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceCheckConstructor.constructForwardBackward(TraceCheckConstructor.java:224) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceCheckConstructor.constructTraceCheck(TraceCheckConstructor.java:188) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceCheckConstructor.get(TraceCheckConstructor.java:165) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.BaseTaipanRefinementStrategy.getTraceCheck(BaseTaipanRefinementStrategy.java:215) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.BaseRefinementStrategy.checkFeasibility(BaseRefinementStrategy.java:223) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.BaseRefinementStrategy.executeStrategy(BaseRefinementStrategy.java:197) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:70) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:456) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:434) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:376) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterate(TraceAbstractionStarter.java:334) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:174) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:126) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:316) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) Caused by: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: EOF at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser$Action$.CUP$do_action(Parser.java:1427) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser.do_action(Parser.java:630) at com.github.jhoenicke.javacup.runtime.LRParser.parse(LRParser.java:419) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:205) ... 39 more [2019-01-20 09:59:59,661 INFO L168 Benchmark]: Toolchain (without parser) took 157921.61 ms. Allocated memory was 133.2 MB in the beginning and 757.6 MB in the end (delta: 624.4 MB). Free memory was 107.3 MB in the beginning and 218.3 MB in the end (delta: -111.0 MB). Peak memory consumption was 513.4 MB. Max. memory is 7.1 GB. [2019-01-20 09:59:59,663 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.21 ms. Allocated memory is still 133.2 MB. Free memory is still 108.6 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-01-20 09:59:59,663 INFO L168 Benchmark]: Boogie Procedure Inliner took 44.04 ms. Allocated memory is still 133.2 MB. Free memory was 107.1 MB in the beginning and 105.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.5 MB. Max. memory is 7.1 GB. [2019-01-20 09:59:59,664 INFO L168 Benchmark]: Boogie Preprocessor took 27.82 ms. Allocated memory is still 133.2 MB. Free memory was 105.4 MB in the beginning and 104.3 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 7.1 GB. [2019-01-20 09:59:59,664 INFO L168 Benchmark]: RCFGBuilder took 270.64 ms. Allocated memory is still 133.2 MB. Free memory was 104.3 MB in the beginning and 95.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2019-01-20 09:59:59,665 INFO L168 Benchmark]: TraceAbstraction took 157574.51 ms. Allocated memory was 133.2 MB in the beginning and 757.6 MB in the end (delta: 624.4 MB). Free memory was 94.8 MB in the beginning and 218.3 MB in the end (delta: -123.5 MB). Peak memory consumption was 500.9 MB. Max. memory is 7.1 GB. [2019-01-20 09:59:59,668 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.21 ms. Allocated memory is still 133.2 MB. Free memory is still 108.6 MB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 44.04 ms. Allocated memory is still 133.2 MB. Free memory was 107.1 MB in the beginning and 105.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 27.82 ms. Allocated memory is still 133.2 MB. Free memory was 105.4 MB in the beginning and 104.3 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 270.64 ms. Allocated memory is still 133.2 MB. Free memory was 104.3 MB in the beginning and 95.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 157574.51 ms. Allocated memory was 133.2 MB in the beginning and 757.6 MB in the end (delta: 624.4 MB). Free memory was 94.8 MB in the beginning and 218.3 MB in the end (delta: -123.5 MB). Peak memory consumption was 500.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: External (z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000)Received EOF on stdin. stderr output: (error "out of memory") de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: External (z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000)Received EOF on stdin. stderr output: (error "out of memory") : de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:208) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...