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-df3cc4e-m [2019-01-11 11:00:50,087 INFO L170 SettingsManager]: Resetting all preferences to default values... [2019-01-11 11:00:50,089 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2019-01-11 11:00:50,104 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-01-11 11:00:50,104 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-01-11 11:00:50,105 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-01-11 11:00:50,107 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-01-11 11:00:50,108 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2019-01-11 11:00:50,110 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-01-11 11:00:50,111 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-01-11 11:00:50,112 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2019-01-11 11:00:50,148 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 [2019-01-11 11:00:50,172 INFO L110 SettingsManager]: Loading preferences was successful [2019-01-11 11:00:50,173 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2019-01-11 11:00:50,174 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2019-01-11 11:00:50,174 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2019-01-11 11:00:50,174 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-01-11 11:00:50,175 INFO L133 SettingsManager]: * User list type=DISABLED [2019-01-11 11:00:50,175 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2019-01-11 11:00:50,175 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-01-11 11:00:50,175 INFO L133 SettingsManager]: * Explicit value domain=true [2019-01-11 11:00:50,175 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-01-11 11:00:50,175 INFO L133 SettingsManager]: * Octagon Domain=false [2019-01-11 11:00:50,176 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2019-01-11 11:00:50,176 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-01-11 11:00:50,176 INFO L133 SettingsManager]: * Interval Domain=false [2019-01-11 11:00:50,177 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-01-11 11:00:50,177 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2019-01-11 11:00:50,179 INFO L133 SettingsManager]: * Use SBE=true [2019-01-11 11:00:50,180 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-01-11 11:00:50,180 INFO L133 SettingsManager]: * sizeof long=4 [2019-01-11 11:00:50,180 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2019-01-11 11:00:50,180 INFO L133 SettingsManager]: * sizeof POINTER=4 [2019-01-11 11:00:50,180 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2019-01-11 11:00:50,181 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-01-11 11:00:50,181 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-01-11 11:00:50,181 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-01-11 11:00:50,181 INFO L133 SettingsManager]: * sizeof long double=12 [2019-01-11 11:00:50,181 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2019-01-11 11:00:50,182 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-01-11 11:00:50,182 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-01-11 11:00:50,182 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-01-11 11:00:50,182 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2019-01-11 11:00:50,182 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:8192 -smt2 -in -t:2000 [2019-01-11 11:00:50,183 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-01-11 11:00:50,183 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-01-11 11:00:50,183 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-01-11 11:00:50,184 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-01-11 11:00:50,184 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-01-11 11:00:50,184 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:8192 -smt2 -in [2019-01-11 11:00:50,184 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-01-11 11:00:50,184 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-01-11 11:00:50,221 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-01-11 11:00:50,234 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-01-11 11:00:50,237 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-01-11 11:00:50,239 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2019-01-11 11:00:50,239 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2019-01-11 11:00:50,240 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/array4.i_4.bpl [2019-01-11 11:00:50,240 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/array4.i_4.bpl' [2019-01-11 11:00:50,280 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-01-11 11:00:50,281 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-01-11 11:00:50,282 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-01-11 11:00:50,282 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-01-11 11:00:50,283 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2019-01-11 11:00:50,300 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 11.01 11:00:50" (1/1) ... [2019-01-11 11:00:50,312 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 11.01 11:00:50" (1/1) ... [2019-01-11 11:00:50,320 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-01-11 11:00:50,320 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-01-11 11:00:50,321 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-01-11 11:00:50,321 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2019-01-11 11:00:50,333 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.01 11:00:50" (1/1) ... [2019-01-11 11:00:50,333 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.01 11:00:50" (1/1) ... [2019-01-11 11:00:50,334 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.01 11:00:50" (1/1) ... [2019-01-11 11:00:50,334 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.01 11:00:50" (1/1) ... [2019-01-11 11:00:50,338 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.01 11:00:50" (1/1) ... [2019-01-11 11:00:50,341 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.01 11:00:50" (1/1) ... [2019-01-11 11:00:50,342 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.01 11:00:50" (1/1) ... [2019-01-11 11:00:50,343 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-01-11 11:00:50,344 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-01-11 11:00:50,344 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-01-11 11:00:50,344 INFO L276 PluginConnector]: RCFGBuilder initialized [2019-01-11 11:00:50,345 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.01 11:00:50" (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:8192 -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:8192 -smt2 -in -t:2000 [2019-01-11 11:00:50,421 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-01-11 11:00:50,421 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-01-11 11:00:50,699 INFO L281 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-01-11 11:00:50,700 INFO L286 CfgBuilder]: Removed 2 assue(true) statements. [2019-01-11 11:00:50,701 INFO L202 PluginConnector]: Adding new model array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.01 11:00:50 BoogieIcfgContainer [2019-01-11 11:00:50,702 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-01-11 11:00:50,704 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-01-11 11:00:50,705 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-01-11 11:00:50,708 INFO L276 PluginConnector]: TraceAbstraction initialized [2019-01-11 11:00:50,708 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.01 11:00:50" (1/2) ... [2019-01-11 11:00:50,710 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5293af1a and model type array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.01 11:00:50, skipping insertion in model container [2019-01-11 11:00:50,710 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.01 11:00:50" (2/2) ... [2019-01-11 11:00:50,712 INFO L112 eAbstractionObserver]: Analyzing ICFG array4.i_4.bpl [2019-01-11 11:00:50,723 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-01-11 11:00:50,734 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-01-11 11:00:50,752 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-01-11 11:00:50,785 INFO L382 AbstractCegarLoop]: Interprodecural is true [2019-01-11 11:00:50,785 INFO L383 AbstractCegarLoop]: Hoare is true [2019-01-11 11:00:50,785 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-01-11 11:00:50,785 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-01-11 11:00:50,786 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-01-11 11:00:50,786 INFO L387 AbstractCegarLoop]: Difference is false [2019-01-11 11:00:50,786 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-01-11 11:00:50,786 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-01-11 11:00:50,801 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2019-01-11 11:00:50,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2019-01-11 11:00:50,807 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:00:50,808 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2019-01-11 11:00:50,810 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:00:50,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:00:50,817 INFO L82 PathProgramCache]: Analyzing trace with hash 928714, now seen corresponding path program 1 times [2019-01-11 11:00:50,819 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:00:50,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:50,864 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:00:50,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:50,864 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:00:50,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:50,957 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-11 11:00:50,960 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-01-11 11:00:50,961 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-01-11 11:00:50,961 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-01-11 11:00:50,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-01-11 11:00:50,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-01-11 11:00:50,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-01-11 11:00:50,982 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2019-01-11 11:00:51,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:00:51,073 INFO L93 Difference]: Finished difference Result 12 states and 16 transitions. [2019-01-11 11:00:51,074 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-01-11 11:00:51,075 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2019-01-11 11:00:51,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:00:51,090 INFO L225 Difference]: With dead ends: 12 [2019-01-11 11:00:51,090 INFO L226 Difference]: Without dead ends: 7 [2019-01-11 11:00:51,098 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 [2019-01-11 11:00:51,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2019-01-11 11:00:51,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2019-01-11 11:00:51,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2019-01-11 11:00:51,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2019-01-11 11:00:51,139 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 4 [2019-01-11 11:00:51,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:00:51,139 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2019-01-11 11:00:51,140 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-01-11 11:00:51,140 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2019-01-11 11:00:51,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-01-11 11:00:51,140 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:00:51,141 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-01-11 11:00:51,141 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:00:51,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:00:51,141 INFO L82 PathProgramCache]: Analyzing trace with hash 894131125, now seen corresponding path program 1 times [2019-01-11 11:00:51,143 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:00:51,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:51,144 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:00:51,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:51,145 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:00:51,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:51,302 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-01-11 11:00:51,303 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:51,303 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:00:51,304 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2019-01-11 11:00:51,307 INFO L207 CegarAbsIntRunner]: [0], [5], [7], [12], [14], [16] [2019-01-11 11:00:51,352 INFO L148 AbstractInterpreter]: Using domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2019-01-11 11:00:51,353 INFO L101 FixpointEngine]: Starting fixpoint engine with domain CompoundDomain (maxUnwinding=3, maxParallelStates=2) [2019-01-11 11:00:51,503 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-01-11 11:00:51,506 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. [2019-01-11 11:00:51,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:00:51,514 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-01-11 11:00:51,514 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:51,514 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 [2019-01-11 11:00:51,528 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:00:51,528 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:00:51,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:51,583 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:00:51,599 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-01-11 11:00:51,599 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:00:51,855 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-01-11 11:00:51,888 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:00:51,889 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2019-01-11 11:00:51,889 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:00:51,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-01-11 11:00:51,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-01-11 11:00:51,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-01-11 11:00:51,890 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand 4 states. [2019-01-11 11:00:51,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:00:51,959 INFO L93 Difference]: Finished difference Result 13 states and 16 transitions. [2019-01-11 11:00:51,960 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-01-11 11:00:51,960 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2019-01-11 11:00:51,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:00:51,960 INFO L225 Difference]: With dead ends: 13 [2019-01-11 11:00:51,960 INFO L226 Difference]: Without dead ends: 9 [2019-01-11 11:00:51,961 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-01-11 11:00:51,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2019-01-11 11:00:51,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2019-01-11 11:00:51,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2019-01-11 11:00:51,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2019-01-11 11:00:51,964 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2019-01-11 11:00:51,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:00:51,964 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2019-01-11 11:00:51,964 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-01-11 11:00:51,964 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2019-01-11 11:00:51,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2019-01-11 11:00:51,965 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:00:51,965 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1] [2019-01-11 11:00:51,965 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:00:51,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:00:51,965 INFO L82 PathProgramCache]: Analyzing trace with hash 315556586, now seen corresponding path program 2 times [2019-01-11 11:00:51,966 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:00:51,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:51,967 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:00:51,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:51,967 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:00:51,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:52,053 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-01-11 11:00:52,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:52,053 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:00:52,054 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:00:52,054 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:00:52,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:52,054 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 [2019-01-11 11:00:52,065 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:00:52,065 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:00:52,101 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-01-11 11:00:52,102 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:00:52,104 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:00:52,108 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-01-11 11:00:52,108 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:00:52,251 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-01-11 11:00:52,283 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:00:52,283 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2019-01-11 11:00:52,284 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:00:52,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-01-11 11:00:52,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-01-11 11:00:52,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-01-11 11:00:52,287 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 5 states. [2019-01-11 11:00:52,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:00:52,414 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2019-01-11 11:00:52,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-01-11 11:00:52,415 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2019-01-11 11:00:52,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:00:52,416 INFO L225 Difference]: With dead ends: 16 [2019-01-11 11:00:52,416 INFO L226 Difference]: Without dead ends: 11 [2019-01-11 11:00:52,417 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 [2019-01-11 11:00:52,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2019-01-11 11:00:52,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2019-01-11 11:00:52,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2019-01-11 11:00:52,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2019-01-11 11:00:52,420 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2019-01-11 11:00:52,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:00:52,420 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2019-01-11 11:00:52,421 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-01-11 11:00:52,421 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2019-01-11 11:00:52,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-01-11 11:00:52,421 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:00:52,422 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1] [2019-01-11 11:00:52,422 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:00:52,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:00:52,422 INFO L82 PathProgramCache]: Analyzing trace with hash -175395819, now seen corresponding path program 3 times [2019-01-11 11:00:52,422 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:00:52,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:52,424 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:00:52,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:52,424 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:00:52,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:52,525 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-01-11 11:00:52,526 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:52,526 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:00:52,527 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:00:52,527 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:00:52,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:52,528 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 [2019-01-11 11:00:52,539 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:00:52,539 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:00:52,584 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:00:52,584 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:00:52,586 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:00:52,591 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-01-11 11:00:52,591 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:00:52,767 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-01-11 11:00:52,798 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:00:52,799 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2019-01-11 11:00:52,799 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:00:52,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-01-11 11:00:52,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-01-11 11:00:52,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-01-11 11:00:52,800 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 6 states. [2019-01-11 11:00:52,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:00:52,849 INFO L93 Difference]: Finished difference Result 19 states and 22 transitions. [2019-01-11 11:00:52,849 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-01-11 11:00:52,850 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2019-01-11 11:00:52,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:00:52,850 INFO L225 Difference]: With dead ends: 19 [2019-01-11 11:00:52,850 INFO L226 Difference]: Without dead ends: 13 [2019-01-11 11:00:52,851 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-01-11 11:00:52,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-01-11 11:00:52,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-01-11 11:00:52,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-01-11 11:00:52,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2019-01-11 11:00:52,855 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2019-01-11 11:00:52,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:00:52,855 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2019-01-11 11:00:52,856 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-01-11 11:00:52,856 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2019-01-11 11:00:52,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-01-11 11:00:52,856 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:00:52,856 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1] [2019-01-11 11:00:52,857 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:00:52,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:00:52,857 INFO L82 PathProgramCache]: Analyzing trace with hash -1258544630, now seen corresponding path program 4 times [2019-01-11 11:00:52,857 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:00:52,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:52,858 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:00:52,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:52,858 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:00:52,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:52,965 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-01-11 11:00:52,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:52,965 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:00:52,965 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:00:52,966 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:00:52,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:52,966 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 [2019-01-11 11:00:52,980 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:00:52,980 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:00:52,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:52,993 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:00:52,998 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-01-11 11:00:52,998 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:00:53,174 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-01-11 11:00:53,194 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:00:53,194 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2019-01-11 11:00:53,194 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:00:53,195 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-01-11 11:00:53,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-01-11 11:00:53,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-01-11 11:00:53,196 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 7 states. [2019-01-11 11:00:53,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:00:53,235 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2019-01-11 11:00:53,237 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-01-11 11:00:53,237 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2019-01-11 11:00:53,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:00:53,238 INFO L225 Difference]: With dead ends: 22 [2019-01-11 11:00:53,238 INFO L226 Difference]: Without dead ends: 15 [2019-01-11 11:00:53,239 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 [2019-01-11 11:00:53,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-01-11 11:00:53,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-01-11 11:00:53,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-01-11 11:00:53,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2019-01-11 11:00:53,242 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2019-01-11 11:00:53,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:00:53,243 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2019-01-11 11:00:53,243 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-01-11 11:00:53,243 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2019-01-11 11:00:53,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-01-11 11:00:53,243 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:00:53,244 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1] [2019-01-11 11:00:53,244 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:00:53,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:00:53,244 INFO L82 PathProgramCache]: Analyzing trace with hash -400886667, now seen corresponding path program 5 times [2019-01-11 11:00:53,244 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:00:53,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:53,245 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:00:53,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:53,246 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:00:53,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:53,630 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-01-11 11:00:53,631 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:53,631 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:00:53,631 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:00:53,632 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:00:53,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:53,632 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 [2019-01-11 11:00:53,640 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:00:53,641 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:00:53,656 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-01-11 11:00:53,656 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:00:53,659 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:00:53,665 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-01-11 11:00:53,666 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:00:53,807 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-01-11 11:00:53,827 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:00:53,827 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2019-01-11 11:00:53,828 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:00:53,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-01-11 11:00:53,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-01-11 11:00:53,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2019-01-11 11:00:53,829 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 8 states. [2019-01-11 11:00:53,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:00:53,886 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2019-01-11 11:00:53,887 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-01-11 11:00:53,887 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2019-01-11 11:00:53,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:00:53,888 INFO L225 Difference]: With dead ends: 25 [2019-01-11 11:00:53,889 INFO L226 Difference]: Without dead ends: 17 [2019-01-11 11:00:53,889 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2019-01-11 11:00:53,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-01-11 11:00:53,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-01-11 11:00:53,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-01-11 11:00:53,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-01-11 11:00:53,893 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2019-01-11 11:00:53,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:00:53,894 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-01-11 11:00:53,894 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-01-11 11:00:53,894 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-01-11 11:00:53,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-01-11 11:00:53,894 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:00:53,895 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1] [2019-01-11 11:00:53,895 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:00:53,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:00:53,895 INFO L82 PathProgramCache]: Analyzing trace with hash -10778326, now seen corresponding path program 6 times [2019-01-11 11:00:53,895 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:00:53,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:53,896 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:00:53,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:53,897 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:00:53,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:54,016 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-01-11 11:00:54,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:54,017 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:00:54,017 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:00:54,017 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:00:54,018 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:54,018 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 [2019-01-11 11:00:54,027 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:00:54,027 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:00:54,046 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:00:54,047 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:00:54,050 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:00:54,056 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-01-11 11:00:54,057 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:00:54,316 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-01-11 11:00:54,336 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:00:54,336 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2019-01-11 11:00:54,337 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:00:54,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-01-11 11:00:54,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-01-11 11:00:54,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2019-01-11 11:00:54,338 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 9 states. [2019-01-11 11:00:54,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:00:54,418 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2019-01-11 11:00:54,418 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-01-11 11:00:54,418 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2019-01-11 11:00:54,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:00:54,419 INFO L225 Difference]: With dead ends: 28 [2019-01-11 11:00:54,419 INFO L226 Difference]: Without dead ends: 19 [2019-01-11 11:00:54,419 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2019-01-11 11:00:54,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-01-11 11:00:54,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-01-11 11:00:54,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-01-11 11:00:54,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2019-01-11 11:00:54,423 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2019-01-11 11:00:54,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:00:54,424 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2019-01-11 11:00:54,424 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-01-11 11:00:54,424 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2019-01-11 11:00:54,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-01-11 11:00:54,425 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:00:54,425 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1] [2019-01-11 11:00:54,425 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:00:54,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:00:54,425 INFO L82 PathProgramCache]: Analyzing trace with hash 701707477, now seen corresponding path program 7 times [2019-01-11 11:00:54,426 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:00:54,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:54,426 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:00:54,427 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:54,427 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:00:54,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:54,714 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-01-11 11:00:54,714 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:54,714 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:00:54,715 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:00:54,715 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:00:54,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:54,715 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 [2019-01-11 11:00:54,724 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:00:54,724 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:00:54,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:54,741 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:00:54,747 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-01-11 11:00:54,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:00:54,933 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-01-11 11:00:54,951 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:00:54,951 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2019-01-11 11:00:54,952 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:00:54,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-01-11 11:00:54,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-01-11 11:00:54,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2019-01-11 11:00:54,953 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 10 states. [2019-01-11 11:00:54,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:00:54,999 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2019-01-11 11:00:55,002 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-01-11 11:00:55,002 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2019-01-11 11:00:55,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:00:55,003 INFO L225 Difference]: With dead ends: 31 [2019-01-11 11:00:55,003 INFO L226 Difference]: Without dead ends: 21 [2019-01-11 11:00:55,004 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 [2019-01-11 11:00:55,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-01-11 11:00:55,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-01-11 11:00:55,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-01-11 11:00:55,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2019-01-11 11:00:55,007 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2019-01-11 11:00:55,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:00:55,008 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2019-01-11 11:00:55,008 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-01-11 11:00:55,008 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2019-01-11 11:00:55,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-01-11 11:00:55,008 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:00:55,008 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1] [2019-01-11 11:00:55,009 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:00:55,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:00:55,009 INFO L82 PathProgramCache]: Analyzing trace with hash -718063542, now seen corresponding path program 8 times [2019-01-11 11:00:55,009 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:00:55,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:55,010 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:00:55,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:55,010 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:00:55,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:55,193 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-01-11 11:00:55,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:55,193 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:00:55,194 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:00:55,194 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:00:55,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:55,194 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 [2019-01-11 11:00:55,213 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:00:55,213 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:00:55,235 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-01-11 11:00:55,236 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:00:55,238 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:00:55,245 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-01-11 11:00:55,245 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:00:55,479 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-01-11 11:00:55,500 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:00:55,501 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2019-01-11 11:00:55,501 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:00:55,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-01-11 11:00:55,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-01-11 11:00:55,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-01-11 11:00:55,502 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2019-01-11 11:00:55,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:00:55,674 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2019-01-11 11:00:55,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-01-11 11:00:55,676 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2019-01-11 11:00:55,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:00:55,677 INFO L225 Difference]: With dead ends: 34 [2019-01-11 11:00:55,677 INFO L226 Difference]: Without dead ends: 23 [2019-01-11 11:00:55,678 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 [2019-01-11 11:00:55,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-01-11 11:00:55,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-01-11 11:00:55,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-01-11 11:00:55,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2019-01-11 11:00:55,684 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2019-01-11 11:00:55,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:00:55,684 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2019-01-11 11:00:55,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-01-11 11:00:55,685 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2019-01-11 11:00:55,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-01-11 11:00:55,685 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:00:55,685 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1] [2019-01-11 11:00:55,686 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:00:55,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:00:55,686 INFO L82 PathProgramCache]: Analyzing trace with hash -317821643, now seen corresponding path program 9 times [2019-01-11 11:00:55,686 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:00:55,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:55,688 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:00:55,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:55,688 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:00:55,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:56,013 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-01-11 11:00:56,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:56,014 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:00:56,014 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:00:56,014 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:00:56,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:56,014 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 [2019-01-11 11:00:56,025 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:00:56,025 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:00:56,071 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:00:56,071 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:00:56,073 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:00:56,080 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-01-11 11:00:56,080 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:00:56,509 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-01-11 11:00:56,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:00:56,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2019-01-11 11:00:56,529 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:00:56,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-01-11 11:00:56,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-01-11 11:00:56,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2019-01-11 11:00:56,531 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 12 states. [2019-01-11 11:00:56,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:00:56,633 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2019-01-11 11:00:56,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-01-11 11:00:56,636 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2019-01-11 11:00:56,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:00:56,637 INFO L225 Difference]: With dead ends: 37 [2019-01-11 11:00:56,637 INFO L226 Difference]: Without dead ends: 25 [2019-01-11 11:00:56,638 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2019-01-11 11:00:56,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-01-11 11:00:56,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-01-11 11:00:56,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-01-11 11:00:56,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2019-01-11 11:00:56,643 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2019-01-11 11:00:56,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:00:56,644 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2019-01-11 11:00:56,644 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-01-11 11:00:56,644 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2019-01-11 11:00:56,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-01-11 11:00:56,649 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:00:56,649 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1] [2019-01-11 11:00:56,650 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:00:56,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:00:56,650 INFO L82 PathProgramCache]: Analyzing trace with hash 1145646954, now seen corresponding path program 10 times [2019-01-11 11:00:56,650 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:00:56,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:56,651 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:00:56,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:56,651 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:00:56,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:57,104 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-01-11 11:00:57,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:57,104 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:00:57,105 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:00:57,105 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:00:57,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:57,105 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 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 [2019-01-11 11:00:57,118 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:00:57,118 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:00:57,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:57,144 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:00:57,149 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-01-11 11:00:57,149 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:00:57,720 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-01-11 11:00:57,739 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:00:57,740 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2019-01-11 11:00:57,740 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:00:57,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-01-11 11:00:57,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-01-11 11:00:57,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2019-01-11 11:00:57,741 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 13 states. [2019-01-11 11:00:57,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:00:57,845 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2019-01-11 11:00:57,845 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-01-11 11:00:57,845 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2019-01-11 11:00:57,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:00:57,846 INFO L225 Difference]: With dead ends: 40 [2019-01-11 11:00:57,846 INFO L226 Difference]: Without dead ends: 27 [2019-01-11 11:00:57,847 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 [2019-01-11 11:00:57,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-01-11 11:00:57,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-01-11 11:00:57,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-01-11 11:00:57,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2019-01-11 11:00:57,851 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2019-01-11 11:00:57,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:00:57,851 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2019-01-11 11:00:57,852 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-01-11 11:00:57,852 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2019-01-11 11:00:57,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-01-11 11:00:57,852 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:00:57,853 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1] [2019-01-11 11:00:57,853 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:00:57,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:00:57,853 INFO L82 PathProgramCache]: Analyzing trace with hash 430349717, now seen corresponding path program 11 times [2019-01-11 11:00:57,854 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:00:57,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:57,855 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:00:57,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:00:57,855 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:00:57,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:00:58,218 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-01-11 11:00:58,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:58,219 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:00:58,219 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:00:58,219 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:00:58,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:00:58,220 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 [2019-01-11 11:00:58,228 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:00:58,228 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:00:58,259 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2019-01-11 11:00:58,259 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:00:58,262 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:00:58,286 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 [2019-01-11 11:00:58,288 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-11 11:00:58,295 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-11 11:00:58,295 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2019-01-11 11:00:58,629 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 [2019-01-11 11:00:58,635 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 8 xjuncts. [2019-01-11 11:00:58,717 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-11 11:00:58,718 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:42, output treesize:3 [2019-01-11 11:00:58,722 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-01-11 11:00:58,722 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:00:59,463 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-01-11 11:00:59,490 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:00:59,490 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14] total 36 [2019-01-11 11:00:59,490 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:00:59,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-01-11 11:00:59,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-01-11 11:00:59,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=549, Invalid=711, Unknown=0, NotChecked=0, Total=1260 [2019-01-11 11:00:59,492 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 24 states. [2019-01-11 11:01:02,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:02,076 INFO L93 Difference]: Finished difference Result 43 states and 46 transitions. [2019-01-11 11:01:02,076 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-01-11 11:01:02,077 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 26 [2019-01-11 11:01:02,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:02,077 INFO L225 Difference]: With dead ends: 43 [2019-01-11 11:01:02,077 INFO L226 Difference]: Without dead ends: 29 [2019-01-11 11:01:02,079 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 554 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=766, Invalid=1040, Unknown=0, NotChecked=0, Total=1806 [2019-01-11 11:01:02,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-01-11 11:01:02,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-01-11 11:01:02,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-01-11 11:01:02,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2019-01-11 11:01:02,084 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2019-01-11 11:01:02,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:02,084 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2019-01-11 11:01:02,084 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-01-11 11:01:02,085 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2019-01-11 11:01:02,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-01-11 11:01:02,085 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:02,086 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1] [2019-01-11 11:01:02,086 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:02,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:02,086 INFO L82 PathProgramCache]: Analyzing trace with hash -454857078, now seen corresponding path program 12 times [2019-01-11 11:01:02,086 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:02,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:02,087 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:02,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:02,088 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:02,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:02,464 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-01-11 11:01:02,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:02,464 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:02,464 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:02,464 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:02,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:02,465 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 [2019-01-11 11:01:02,474 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:01:02,474 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:01:02,507 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:01:02,507 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:02,509 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:02,516 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-01-11 11:01:02,516 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:02,824 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-01-11 11:01:02,844 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:02,845 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2019-01-11 11:01:02,845 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:02,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-01-11 11:01:02,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-01-11 11:01:02,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2019-01-11 11:01:02,846 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 15 states. [2019-01-11 11:01:02,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:02,923 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2019-01-11 11:01:02,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-01-11 11:01:02,924 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2019-01-11 11:01:02,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:02,925 INFO L225 Difference]: With dead ends: 46 [2019-01-11 11:01:02,925 INFO L226 Difference]: Without dead ends: 31 [2019-01-11 11:01:02,927 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2019-01-11 11:01:02,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-01-11 11:01:02,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-01-11 11:01:02,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-01-11 11:01:02,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2019-01-11 11:01:02,932 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2019-01-11 11:01:02,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:02,933 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2019-01-11 11:01:02,933 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-01-11 11:01:02,933 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2019-01-11 11:01:02,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-01-11 11:01:02,934 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:02,934 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1] [2019-01-11 11:01:02,934 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:02,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:02,935 INFO L82 PathProgramCache]: Analyzing trace with hash -319437323, now seen corresponding path program 13 times [2019-01-11 11:01:02,935 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:02,936 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:02,936 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:02,936 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:02,936 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:02,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:03,162 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-01-11 11:01:03,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:03,163 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:03,163 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:03,163 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:03,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:03,163 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 [2019-01-11 11:01:03,173 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:03,173 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:01:03,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:03,196 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:03,202 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-01-11 11:01:03,203 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:03,585 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-01-11 11:01:03,605 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:03,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2019-01-11 11:01:03,605 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:03,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-01-11 11:01:03,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-01-11 11:01:03,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2019-01-11 11:01:03,606 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 16 states. [2019-01-11 11:01:03,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:03,693 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2019-01-11 11:01:03,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-01-11 11:01:03,694 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2019-01-11 11:01:03,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:03,695 INFO L225 Difference]: With dead ends: 49 [2019-01-11 11:01:03,695 INFO L226 Difference]: Without dead ends: 33 [2019-01-11 11:01:03,696 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2019-01-11 11:01:03,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-01-11 11:01:03,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2019-01-11 11:01:03,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-01-11 11:01:03,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2019-01-11 11:01:03,703 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2019-01-11 11:01:03,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:03,703 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2019-01-11 11:01:03,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-01-11 11:01:03,703 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2019-01-11 11:01:03,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-01-11 11:01:03,704 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:03,704 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1] [2019-01-11 11:01:03,705 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:03,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:03,705 INFO L82 PathProgramCache]: Analyzing trace with hash 969405866, now seen corresponding path program 14 times [2019-01-11 11:01:03,705 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:03,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:03,706 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:03,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:03,706 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:03,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:03,950 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-01-11 11:01:03,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:03,950 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:03,951 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:03,951 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:03,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:03,951 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 [2019-01-11 11:01:03,960 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:01:03,960 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:01:04,001 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2019-01-11 11:01:04,001 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:04,004 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:04,011 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-01-11 11:01:04,011 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:04,319 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-01-11 11:01:04,339 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:04,339 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 32 [2019-01-11 11:01:04,339 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:04,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-01-11 11:01:04,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-01-11 11:01:04,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2019-01-11 11:01:04,341 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 17 states. [2019-01-11 11:01:04,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:04,455 INFO L93 Difference]: Finished difference Result 52 states and 55 transitions. [2019-01-11 11:01:04,456 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-01-11 11:01:04,456 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2019-01-11 11:01:04,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:04,456 INFO L225 Difference]: With dead ends: 52 [2019-01-11 11:01:04,457 INFO L226 Difference]: Without dead ends: 35 [2019-01-11 11:01:04,457 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 [2019-01-11 11:01:04,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-01-11 11:01:04,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2019-01-11 11:01:04,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-01-11 11:01:04,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2019-01-11 11:01:04,463 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2019-01-11 11:01:04,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:04,463 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2019-01-11 11:01:04,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-01-11 11:01:04,463 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2019-01-11 11:01:04,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-01-11 11:01:04,464 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:04,464 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1] [2019-01-11 11:01:04,464 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:04,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:04,465 INFO L82 PathProgramCache]: Analyzing trace with hash -1714035115, now seen corresponding path program 15 times [2019-01-11 11:01:04,465 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:04,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:04,466 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:04,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:04,466 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:04,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:04,696 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-01-11 11:01:04,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:04,697 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:04,697 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:04,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:04,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:04,697 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 [2019-01-11 11:01:04,706 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:01:04,706 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:01:04,731 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:01:04,731 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:04,737 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:04,747 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-01-11 11:01:04,748 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:05,518 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-01-11 11:01:05,537 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:05,538 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2019-01-11 11:01:05,538 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:05,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-01-11 11:01:05,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-01-11 11:01:05,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2019-01-11 11:01:05,539 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 18 states. [2019-01-11 11:01:05,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:05,676 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2019-01-11 11:01:05,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-01-11 11:01:05,676 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2019-01-11 11:01:05,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:05,677 INFO L225 Difference]: With dead ends: 55 [2019-01-11 11:01:05,677 INFO L226 Difference]: Without dead ends: 37 [2019-01-11 11:01:05,678 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 [2019-01-11 11:01:05,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-01-11 11:01:05,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2019-01-11 11:01:05,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-01-11 11:01:05,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2019-01-11 11:01:05,684 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2019-01-11 11:01:05,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:05,684 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2019-01-11 11:01:05,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-01-11 11:01:05,685 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2019-01-11 11:01:05,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-01-11 11:01:05,685 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:05,685 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1] [2019-01-11 11:01:05,686 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:05,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:05,686 INFO L82 PathProgramCache]: Analyzing trace with hash 272417994, now seen corresponding path program 16 times [2019-01-11 11:01:05,686 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:05,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:05,687 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:05,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:05,687 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:05,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:05,884 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-01-11 11:01:05,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:05,884 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:05,884 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:05,884 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:05,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:05,885 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 [2019-01-11 11:01:05,893 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:05,894 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:01:05,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:05,918 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:05,925 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-01-11 11:01:05,925 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:06,722 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-01-11 11:01:06,740 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:06,740 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2019-01-11 11:01:06,741 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:06,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-01-11 11:01:06,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-01-11 11:01:06,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2019-01-11 11:01:06,742 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 19 states. [2019-01-11 11:01:06,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:06,810 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2019-01-11 11:01:06,811 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-01-11 11:01:06,811 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2019-01-11 11:01:06,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:06,812 INFO L225 Difference]: With dead ends: 58 [2019-01-11 11:01:06,812 INFO L226 Difference]: Without dead ends: 39 [2019-01-11 11:01:06,813 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2019-01-11 11:01:06,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-01-11 11:01:06,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-01-11 11:01:06,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-01-11 11:01:06,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2019-01-11 11:01:06,820 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2019-01-11 11:01:06,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:06,820 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2019-01-11 11:01:06,820 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-01-11 11:01:06,820 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2019-01-11 11:01:06,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-01-11 11:01:06,821 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:06,821 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1] [2019-01-11 11:01:06,822 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:06,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:06,822 INFO L82 PathProgramCache]: Analyzing trace with hash -392102219, now seen corresponding path program 17 times [2019-01-11 11:01:06,822 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:06,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:06,823 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:06,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:06,823 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:06,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:07,605 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-01-11 11:01:07,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:07,606 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:07,606 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:07,606 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:07,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:07,606 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 [2019-01-11 11:01:07,614 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:01:07,614 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:01:07,675 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-01-11 11:01:07,675 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:07,679 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:07,686 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-01-11 11:01:07,686 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:08,145 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-01-11 11:01:08,166 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:08,166 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2019-01-11 11:01:08,166 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:08,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-01-11 11:01:08,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-01-11 11:01:08,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2019-01-11 11:01:08,168 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 20 states. [2019-01-11 11:01:08,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:08,403 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2019-01-11 11:01:08,403 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-01-11 11:01:08,403 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2019-01-11 11:01:08,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:08,404 INFO L225 Difference]: With dead ends: 61 [2019-01-11 11:01:08,404 INFO L226 Difference]: Without dead ends: 41 [2019-01-11 11:01:08,404 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2019-01-11 11:01:08,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-01-11 11:01:08,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2019-01-11 11:01:08,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-01-11 11:01:08,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2019-01-11 11:01:08,410 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2019-01-11 11:01:08,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:08,411 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2019-01-11 11:01:08,411 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-01-11 11:01:08,411 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2019-01-11 11:01:08,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-01-11 11:01:08,412 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:08,412 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1] [2019-01-11 11:01:08,412 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:08,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:08,412 INFO L82 PathProgramCache]: Analyzing trace with hash -536355862, now seen corresponding path program 18 times [2019-01-11 11:01:08,412 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:08,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:08,413 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:08,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:08,414 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:08,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:08,705 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2019-01-11 11:01:08,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:08,706 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:08,706 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:08,706 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:08,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:08,706 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 [2019-01-11 11:01:08,714 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:01:08,715 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:01:08,738 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:01:08,738 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:08,741 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:08,749 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2019-01-11 11:01:08,749 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:09,200 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2019-01-11 11:01:09,220 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:09,220 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2019-01-11 11:01:09,220 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:09,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-01-11 11:01:09,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-01-11 11:01:09,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2019-01-11 11:01:09,222 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2019-01-11 11:01:09,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:09,367 INFO L93 Difference]: Finished difference Result 64 states and 67 transitions. [2019-01-11 11:01:09,367 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-01-11 11:01:09,367 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2019-01-11 11:01:09,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:09,368 INFO L225 Difference]: With dead ends: 64 [2019-01-11 11:01:09,368 INFO L226 Difference]: Without dead ends: 43 [2019-01-11 11:01:09,369 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 [2019-01-11 11:01:09,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-01-11 11:01:09,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2019-01-11 11:01:09,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-01-11 11:01:09,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2019-01-11 11:01:09,374 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2019-01-11 11:01:09,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:09,375 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2019-01-11 11:01:09,375 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-01-11 11:01:09,375 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2019-01-11 11:01:09,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-01-11 11:01:09,376 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:09,376 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1] [2019-01-11 11:01:09,376 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:09,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:09,377 INFO L82 PathProgramCache]: Analyzing trace with hash -684650731, now seen corresponding path program 19 times [2019-01-11 11:01:09,377 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:09,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:09,377 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:09,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:09,378 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:09,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:10,192 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-01-11 11:01:10,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:10,192 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:10,192 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:10,192 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:10,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:10,193 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 [2019-01-11 11:01:10,201 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:10,202 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:01:10,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:10,228 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:10,234 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-01-11 11:01:10,234 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:10,769 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-01-11 11:01:10,789 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:10,789 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2019-01-11 11:01:10,789 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:10,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-01-11 11:01:10,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-01-11 11:01:10,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2019-01-11 11:01:10,791 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 22 states. [2019-01-11 11:01:10,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:10,861 INFO L93 Difference]: Finished difference Result 67 states and 70 transitions. [2019-01-11 11:01:10,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-01-11 11:01:10,862 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 42 [2019-01-11 11:01:10,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:10,863 INFO L225 Difference]: With dead ends: 67 [2019-01-11 11:01:10,863 INFO L226 Difference]: Without dead ends: 45 [2019-01-11 11:01:10,864 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2019-01-11 11:01:10,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-01-11 11:01:10,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2019-01-11 11:01:10,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-01-11 11:01:10,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2019-01-11 11:01:10,869 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2019-01-11 11:01:10,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:10,869 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2019-01-11 11:01:10,869 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-01-11 11:01:10,870 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2019-01-11 11:01:10,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-01-11 11:01:10,870 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:10,870 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1] [2019-01-11 11:01:10,871 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:10,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:10,871 INFO L82 PathProgramCache]: Analyzing trace with hash 728709898, now seen corresponding path program 20 times [2019-01-11 11:01:10,871 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:10,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:10,872 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:10,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:10,872 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:10,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:11,670 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-01-11 11:01:11,670 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:11,670 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:11,671 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:11,671 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:11,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:11,671 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 [2019-01-11 11:01:11,681 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:01:11,682 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:01:11,776 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2019-01-11 11:01:11,776 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:11,780 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:11,790 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-01-11 11:01:11,790 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:12,688 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-01-11 11:01:12,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:12,707 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2019-01-11 11:01:12,707 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:12,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-01-11 11:01:12,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-01-11 11:01:12,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2019-01-11 11:01:12,708 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 23 states. [2019-01-11 11:01:12,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:12,806 INFO L93 Difference]: Finished difference Result 70 states and 73 transitions. [2019-01-11 11:01:12,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-01-11 11:01:12,807 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 44 [2019-01-11 11:01:12,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:12,808 INFO L225 Difference]: With dead ends: 70 [2019-01-11 11:01:12,808 INFO L226 Difference]: Without dead ends: 47 [2019-01-11 11:01:12,809 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2019-01-11 11:01:12,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-01-11 11:01:12,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-01-11 11:01:12,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-01-11 11:01:12,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2019-01-11 11:01:12,818 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2019-01-11 11:01:12,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:12,818 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2019-01-11 11:01:12,818 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-01-11 11:01:12,818 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2019-01-11 11:01:12,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-01-11 11:01:12,819 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:12,819 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1] [2019-01-11 11:01:12,819 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:12,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:12,823 INFO L82 PathProgramCache]: Analyzing trace with hash 954210165, now seen corresponding path program 21 times [2019-01-11 11:01:12,823 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:12,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:12,824 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:12,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:12,824 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:12,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:13,128 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2019-01-11 11:01:13,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:13,129 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:13,129 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:13,129 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:13,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:13,129 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 [2019-01-11 11:01:13,139 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:01:13,139 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:01:13,170 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:01:13,170 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:13,172 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:13,181 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2019-01-11 11:01:13,181 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:13,715 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2019-01-11 11:01:13,734 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:13,735 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2019-01-11 11:01:13,735 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:13,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-01-11 11:01:13,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-01-11 11:01:13,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2019-01-11 11:01:13,736 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 24 states. [2019-01-11 11:01:13,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:13,815 INFO L93 Difference]: Finished difference Result 73 states and 76 transitions. [2019-01-11 11:01:13,817 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-01-11 11:01:13,817 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2019-01-11 11:01:13,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:13,818 INFO L225 Difference]: With dead ends: 73 [2019-01-11 11:01:13,818 INFO L226 Difference]: Without dead ends: 49 [2019-01-11 11:01:13,820 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2019-01-11 11:01:13,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-01-11 11:01:13,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2019-01-11 11:01:13,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-01-11 11:01:13,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2019-01-11 11:01:13,824 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2019-01-11 11:01:13,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:13,825 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2019-01-11 11:01:13,825 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-01-11 11:01:13,825 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2019-01-11 11:01:13,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-01-11 11:01:13,826 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:13,826 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1] [2019-01-11 11:01:13,826 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:13,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:13,826 INFO L82 PathProgramCache]: Analyzing trace with hash -549920214, now seen corresponding path program 22 times [2019-01-11 11:01:13,826 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:13,827 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:13,827 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:13,827 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:13,827 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:13,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:14,154 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-01-11 11:01:14,155 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:14,155 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:14,155 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:14,155 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:14,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:14,156 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 [2019-01-11 11:01:14,167 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:14,167 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:01:14,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:14,202 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:14,208 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-01-11 11:01:14,208 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:14,773 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-01-11 11:01:14,792 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:14,792 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2019-01-11 11:01:14,792 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:14,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-01-11 11:01:14,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-01-11 11:01:14,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2019-01-11 11:01:14,795 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 25 states. [2019-01-11 11:01:14,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:14,880 INFO L93 Difference]: Finished difference Result 76 states and 79 transitions. [2019-01-11 11:01:14,880 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-01-11 11:01:14,881 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 48 [2019-01-11 11:01:14,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:14,881 INFO L225 Difference]: With dead ends: 76 [2019-01-11 11:01:14,881 INFO L226 Difference]: Without dead ends: 51 [2019-01-11 11:01:14,883 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 [2019-01-11 11:01:14,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-01-11 11:01:14,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2019-01-11 11:01:14,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-01-11 11:01:14,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2019-01-11 11:01:14,888 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2019-01-11 11:01:14,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:14,888 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2019-01-11 11:01:14,888 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-01-11 11:01:14,888 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2019-01-11 11:01:14,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-01-11 11:01:14,889 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:14,889 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1] [2019-01-11 11:01:14,889 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:14,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:14,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1451759573, now seen corresponding path program 23 times [2019-01-11 11:01:14,890 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:14,891 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:14,891 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:14,891 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:14,891 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:14,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:15,294 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-01-11 11:01:15,294 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:15,294 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:15,294 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:15,294 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:15,294 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:15,295 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 [2019-01-11 11:01:15,306 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:01:15,306 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:01:15,474 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2019-01-11 11:01:15,474 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:15,478 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:15,483 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-01-11 11:01:15,484 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:16,596 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-01-11 11:01:16,615 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:16,615 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26, 26] total 50 [2019-01-11 11:01:16,615 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:16,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-01-11 11:01:16,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-01-11 11:01:16,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2019-01-11 11:01:16,617 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 26 states. [2019-01-11 11:01:16,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:16,687 INFO L93 Difference]: Finished difference Result 79 states and 82 transitions. [2019-01-11 11:01:16,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-01-11 11:01:16,688 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 50 [2019-01-11 11:01:16,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:16,689 INFO L225 Difference]: With dead ends: 79 [2019-01-11 11:01:16,689 INFO L226 Difference]: Without dead ends: 53 [2019-01-11 11:01:16,690 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2019-01-11 11:01:16,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-01-11 11:01:16,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2019-01-11 11:01:16,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-01-11 11:01:16,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2019-01-11 11:01:16,695 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2019-01-11 11:01:16,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:16,696 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2019-01-11 11:01:16,696 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-01-11 11:01:16,696 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2019-01-11 11:01:16,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-01-11 11:01:16,696 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:16,697 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1] [2019-01-11 11:01:16,697 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:16,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:16,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1297428150, now seen corresponding path program 24 times [2019-01-11 11:01:16,697 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:16,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:16,698 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:16,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:16,698 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:16,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:17,285 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2019-01-11 11:01:17,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:17,286 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:17,286 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:17,286 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:17,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:17,286 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 [2019-01-11 11:01:17,295 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:01:17,295 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:01:17,331 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:01:17,331 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:17,333 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:17,339 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2019-01-11 11:01:17,339 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:18,304 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2019-01-11 11:01:18,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:18,323 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2019-01-11 11:01:18,323 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:18,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-01-11 11:01:18,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-01-11 11:01:18,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2019-01-11 11:01:18,324 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 27 states. [2019-01-11 11:01:18,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:18,465 INFO L93 Difference]: Finished difference Result 82 states and 85 transitions. [2019-01-11 11:01:18,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-01-11 11:01:18,465 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 52 [2019-01-11 11:01:18,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:18,466 INFO L225 Difference]: With dead ends: 82 [2019-01-11 11:01:18,466 INFO L226 Difference]: Without dead ends: 55 [2019-01-11 11:01:18,467 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 [2019-01-11 11:01:18,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-01-11 11:01:18,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2019-01-11 11:01:18,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-01-11 11:01:18,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2019-01-11 11:01:18,472 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2019-01-11 11:01:18,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:18,473 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2019-01-11 11:01:18,473 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-01-11 11:01:18,473 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2019-01-11 11:01:18,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-01-11 11:01:18,473 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:18,474 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1] [2019-01-11 11:01:18,474 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:18,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:18,474 INFO L82 PathProgramCache]: Analyzing trace with hash -1904013259, now seen corresponding path program 25 times [2019-01-11 11:01:18,474 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:18,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:18,475 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:18,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:18,475 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:18,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:18,922 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2019-01-11 11:01:18,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:18,922 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:18,922 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:18,923 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:18,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:18,923 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 [2019-01-11 11:01:18,932 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:18,932 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:01:18,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:18,969 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:18,975 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2019-01-11 11:01:18,975 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:19,701 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2019-01-11 11:01:19,720 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:19,720 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2019-01-11 11:01:19,720 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:19,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-01-11 11:01:19,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-01-11 11:01:19,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2019-01-11 11:01:19,722 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 28 states. [2019-01-11 11:01:19,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:19,818 INFO L93 Difference]: Finished difference Result 85 states and 88 transitions. [2019-01-11 11:01:19,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-01-11 11:01:19,818 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 54 [2019-01-11 11:01:19,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:19,819 INFO L225 Difference]: With dead ends: 85 [2019-01-11 11:01:19,819 INFO L226 Difference]: Without dead ends: 57 [2019-01-11 11:01:19,821 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2019-01-11 11:01:19,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-01-11 11:01:19,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2019-01-11 11:01:19,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-01-11 11:01:19,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2019-01-11 11:01:19,824 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2019-01-11 11:01:19,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:19,824 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2019-01-11 11:01:19,824 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-01-11 11:01:19,825 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2019-01-11 11:01:19,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-01-11 11:01:19,825 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:19,825 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1] [2019-01-11 11:01:19,825 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:19,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:19,826 INFO L82 PathProgramCache]: Analyzing trace with hash -2020931478, now seen corresponding path program 26 times [2019-01-11 11:01:19,826 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:19,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:19,827 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:19,827 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:19,827 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:19,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:20,461 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2019-01-11 11:01:20,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:20,462 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:20,462 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:20,462 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:20,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:20,462 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 [2019-01-11 11:01:20,473 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:01:20,473 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:01:20,634 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2019-01-11 11:01:20,634 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:20,639 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:20,652 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2019-01-11 11:01:20,652 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:21,430 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2019-01-11 11:01:21,450 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:21,450 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 29] total 56 [2019-01-11 11:01:21,450 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:21,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-01-11 11:01:21,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-01-11 11:01:21,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2019-01-11 11:01:21,453 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 29 states. [2019-01-11 11:01:21,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:21,526 INFO L93 Difference]: Finished difference Result 88 states and 91 transitions. [2019-01-11 11:01:21,527 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-01-11 11:01:21,527 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 56 [2019-01-11 11:01:21,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:21,528 INFO L225 Difference]: With dead ends: 88 [2019-01-11 11:01:21,528 INFO L226 Difference]: Without dead ends: 59 [2019-01-11 11:01:21,530 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2019-01-11 11:01:21,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-01-11 11:01:21,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2019-01-11 11:01:21,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-01-11 11:01:21,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2019-01-11 11:01:21,533 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2019-01-11 11:01:21,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:21,534 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2019-01-11 11:01:21,534 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-01-11 11:01:21,534 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2019-01-11 11:01:21,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-01-11 11:01:21,535 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:21,535 INFO L402 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1] [2019-01-11 11:01:21,535 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:21,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:21,536 INFO L82 PathProgramCache]: Analyzing trace with hash -190119787, now seen corresponding path program 27 times [2019-01-11 11:01:21,536 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:21,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:21,537 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:21,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:21,537 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:21,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:21,979 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2019-01-11 11:01:21,979 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:21,979 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:21,979 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:21,979 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:21,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:21,980 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 [2019-01-11 11:01:21,989 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:01:21,989 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:01:22,027 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:01:22,028 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:22,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:22,039 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2019-01-11 11:01:22,039 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:23,174 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2019-01-11 11:01:23,192 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:23,193 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2019-01-11 11:01:23,193 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:23,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-01-11 11:01:23,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-01-11 11:01:23,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2019-01-11 11:01:23,194 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand 30 states. [2019-01-11 11:01:23,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:23,323 INFO L93 Difference]: Finished difference Result 91 states and 94 transitions. [2019-01-11 11:01:23,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-01-11 11:01:23,324 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 58 [2019-01-11 11:01:23,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:23,324 INFO L225 Difference]: With dead ends: 91 [2019-01-11 11:01:23,325 INFO L226 Difference]: Without dead ends: 61 [2019-01-11 11:01:23,326 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2019-01-11 11:01:23,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-01-11 11:01:23,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2019-01-11 11:01:23,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-01-11 11:01:23,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2019-01-11 11:01:23,328 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 58 [2019-01-11 11:01:23,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:23,329 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2019-01-11 11:01:23,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-01-11 11:01:23,329 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2019-01-11 11:01:23,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-01-11 11:01:23,329 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:23,330 INFO L402 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1] [2019-01-11 11:01:23,330 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:23,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:23,330 INFO L82 PathProgramCache]: Analyzing trace with hash -903903350, now seen corresponding path program 28 times [2019-01-11 11:01:23,330 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:23,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:23,331 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:23,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:23,331 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:23,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:23,992 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2019-01-11 11:01:23,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:23,992 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:23,993 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:23,993 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:23,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:23,993 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 [2019-01-11 11:01:24,002 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:24,003 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:01:24,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:24,054 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:24,064 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2019-01-11 11:01:24,065 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:25,301 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2019-01-11 11:01:25,320 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:25,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 59 [2019-01-11 11:01:25,320 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:25,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-01-11 11:01:25,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-01-11 11:01:25,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1770, Invalid=1770, Unknown=0, NotChecked=0, Total=3540 [2019-01-11 11:01:25,321 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 31 states. [2019-01-11 11:01:25,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:25,457 INFO L93 Difference]: Finished difference Result 94 states and 97 transitions. [2019-01-11 11:01:25,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-01-11 11:01:25,457 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 60 [2019-01-11 11:01:25,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:25,458 INFO L225 Difference]: With dead ends: 94 [2019-01-11 11:01:25,458 INFO L226 Difference]: Without dead ends: 63 [2019-01-11 11:01:25,459 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1770, Invalid=1770, Unknown=0, NotChecked=0, Total=3540 [2019-01-11 11:01:25,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2019-01-11 11:01:25,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2019-01-11 11:01:25,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-01-11 11:01:25,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2019-01-11 11:01:25,463 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 60 [2019-01-11 11:01:25,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:25,463 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2019-01-11 11:01:25,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-01-11 11:01:25,463 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2019-01-11 11:01:25,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-01-11 11:01:25,464 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:25,464 INFO L402 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1] [2019-01-11 11:01:25,464 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:25,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:25,465 INFO L82 PathProgramCache]: Analyzing trace with hash -228988683, now seen corresponding path program 29 times [2019-01-11 11:01:25,465 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:25,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:25,465 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:25,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:25,466 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:25,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:25,882 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2019-01-11 11:01:25,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:25,882 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:25,882 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:25,882 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:25,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:25,883 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 [2019-01-11 11:01:25,890 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:01:25,890 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:01:26,083 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-01-11 11:01:26,083 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:26,087 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:26,097 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2019-01-11 11:01:26,097 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:27,069 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2019-01-11 11:01:27,087 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:27,087 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 32, 32] total 62 [2019-01-11 11:01:27,088 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:27,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-01-11 11:01:27,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-01-11 11:01:27,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2019-01-11 11:01:27,089 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 32 states. [2019-01-11 11:01:27,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:27,162 INFO L93 Difference]: Finished difference Result 97 states and 100 transitions. [2019-01-11 11:01:27,162 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-01-11 11:01:27,162 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 62 [2019-01-11 11:01:27,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:27,163 INFO L225 Difference]: With dead ends: 97 [2019-01-11 11:01:27,163 INFO L226 Difference]: Without dead ends: 65 [2019-01-11 11:01:27,165 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2019-01-11 11:01:27,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-01-11 11:01:27,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2019-01-11 11:01:27,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-01-11 11:01:27,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2019-01-11 11:01:27,168 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 62 [2019-01-11 11:01:27,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:27,169 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2019-01-11 11:01:27,169 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-01-11 11:01:27,169 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2019-01-11 11:01:27,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-01-11 11:01:27,169 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:27,169 INFO L402 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1] [2019-01-11 11:01:27,169 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:27,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:27,170 INFO L82 PathProgramCache]: Analyzing trace with hash -785494358, now seen corresponding path program 30 times [2019-01-11 11:01:27,170 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:27,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:27,170 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:27,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:27,171 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:27,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:27,687 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-01-11 11:01:27,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:27,688 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:27,688 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:27,688 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:27,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:27,688 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 [2019-01-11 11:01:27,699 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:01:27,699 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:01:27,740 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:01:27,740 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:27,742 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:27,749 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-01-11 11:01:27,749 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:28,742 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-01-11 11:01:28,762 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:28,762 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2019-01-11 11:01:28,762 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:28,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-01-11 11:01:28,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-01-11 11:01:28,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2019-01-11 11:01:28,763 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand 33 states. [2019-01-11 11:01:28,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:28,874 INFO L93 Difference]: Finished difference Result 100 states and 103 transitions. [2019-01-11 11:01:28,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-01-11 11:01:28,875 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 64 [2019-01-11 11:01:28,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:28,875 INFO L225 Difference]: With dead ends: 100 [2019-01-11 11:01:28,876 INFO L226 Difference]: Without dead ends: 67 [2019-01-11 11:01:28,876 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2019-01-11 11:01:28,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-01-11 11:01:28,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2019-01-11 11:01:28,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-01-11 11:01:28,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2019-01-11 11:01:28,880 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 64 [2019-01-11 11:01:28,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:28,880 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2019-01-11 11:01:28,880 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-01-11 11:01:28,880 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2019-01-11 11:01:28,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2019-01-11 11:01:28,881 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:28,881 INFO L402 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1] [2019-01-11 11:01:28,881 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:28,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:28,881 INFO L82 PathProgramCache]: Analyzing trace with hash -429274795, now seen corresponding path program 31 times [2019-01-11 11:01:28,881 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:28,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:28,882 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:28,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:28,882 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:28,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:29,965 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2019-01-11 11:01:29,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:29,965 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:29,966 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:29,966 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:29,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:29,966 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 [2019-01-11 11:01:29,974 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:29,974 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:01:30,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:30,024 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:30,037 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2019-01-11 11:01:30,037 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:31,185 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2019-01-11 11:01:31,203 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:31,203 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2019-01-11 11:01:31,203 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:31,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-01-11 11:01:31,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-01-11 11:01:31,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2145, Invalid=2145, Unknown=0, NotChecked=0, Total=4290 [2019-01-11 11:01:31,205 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 34 states. [2019-01-11 11:01:31,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:31,339 INFO L93 Difference]: Finished difference Result 103 states and 106 transitions. [2019-01-11 11:01:31,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-01-11 11:01:31,339 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 66 [2019-01-11 11:01:31,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:31,340 INFO L225 Difference]: With dead ends: 103 [2019-01-11 11:01:31,340 INFO L226 Difference]: Without dead ends: 69 [2019-01-11 11:01:31,341 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2145, Invalid=2145, Unknown=0, NotChecked=0, Total=4290 [2019-01-11 11:01:31,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2019-01-11 11:01:31,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2019-01-11 11:01:31,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2019-01-11 11:01:31,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2019-01-11 11:01:31,345 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 66 [2019-01-11 11:01:31,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:31,346 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2019-01-11 11:01:31,346 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-01-11 11:01:31,346 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2019-01-11 11:01:31,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-01-11 11:01:31,346 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:31,347 INFO L402 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1] [2019-01-11 11:01:31,347 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:31,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:31,347 INFO L82 PathProgramCache]: Analyzing trace with hash 1040014794, now seen corresponding path program 32 times [2019-01-11 11:01:31,347 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:31,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:31,348 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:31,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:31,348 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:31,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:31,896 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2019-01-11 11:01:31,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:31,896 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:31,896 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:31,896 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:31,897 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:31,897 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 [2019-01-11 11:01:31,906 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:01:31,906 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:01:32,147 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2019-01-11 11:01:32,147 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:32,150 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:32,158 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2019-01-11 11:01:32,158 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:33,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2019-01-11 11:01:33,569 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:33,569 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2019-01-11 11:01:33,569 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:33,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-01-11 11:01:33,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-01-11 11:01:33,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2019-01-11 11:01:33,570 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 35 states. [2019-01-11 11:01:33,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:33,720 INFO L93 Difference]: Finished difference Result 106 states and 109 transitions. [2019-01-11 11:01:33,720 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-01-11 11:01:33,720 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 68 [2019-01-11 11:01:33,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:33,721 INFO L225 Difference]: With dead ends: 106 [2019-01-11 11:01:33,721 INFO L226 Difference]: Without dead ends: 71 [2019-01-11 11:01:33,722 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2019-01-11 11:01:33,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-01-11 11:01:33,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2019-01-11 11:01:33,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2019-01-11 11:01:33,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2019-01-11 11:01:33,726 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 68 [2019-01-11 11:01:33,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:33,727 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2019-01-11 11:01:33,727 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-01-11 11:01:33,727 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2019-01-11 11:01:33,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2019-01-11 11:01:33,727 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:33,727 INFO L402 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1] [2019-01-11 11:01:33,727 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:33,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:33,728 INFO L82 PathProgramCache]: Analyzing trace with hash -986406475, now seen corresponding path program 33 times [2019-01-11 11:01:33,728 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:33,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:33,728 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:33,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:33,729 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:33,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:34,253 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2019-01-11 11:01:34,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:34,254 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:34,254 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:34,254 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:34,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:34,254 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 [2019-01-11 11:01:34,263 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:01:34,263 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:01:34,305 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:01:34,305 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:34,307 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:34,315 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2019-01-11 11:01:34,316 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:35,565 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2019-01-11 11:01:35,583 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:35,583 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2019-01-11 11:01:35,583 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:35,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-01-11 11:01:35,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-01-11 11:01:35,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2019-01-11 11:01:35,584 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand 36 states. [2019-01-11 11:01:35,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:35,739 INFO L93 Difference]: Finished difference Result 109 states and 112 transitions. [2019-01-11 11:01:35,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-01-11 11:01:35,740 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 70 [2019-01-11 11:01:35,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:35,741 INFO L225 Difference]: With dead ends: 109 [2019-01-11 11:01:35,741 INFO L226 Difference]: Without dead ends: 73 [2019-01-11 11:01:35,742 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2019-01-11 11:01:35,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-01-11 11:01:35,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2019-01-11 11:01:35,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-01-11 11:01:35,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2019-01-11 11:01:35,745 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 70 [2019-01-11 11:01:35,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:35,745 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2019-01-11 11:01:35,745 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-01-11 11:01:35,745 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2019-01-11 11:01:35,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-01-11 11:01:35,746 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:35,746 INFO L402 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1] [2019-01-11 11:01:35,746 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:35,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:35,746 INFO L82 PathProgramCache]: Analyzing trace with hash 1548924138, now seen corresponding path program 34 times [2019-01-11 11:01:35,747 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:35,747 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:35,747 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:35,747 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:35,748 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:35,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:36,314 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2019-01-11 11:01:36,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:36,314 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:36,314 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:36,314 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:36,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:36,315 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 [2019-01-11 11:01:36,324 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:36,324 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:01:36,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:36,375 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:36,385 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2019-01-11 11:01:36,385 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:37,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2019-01-11 11:01:37,706 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:37,706 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2019-01-11 11:01:37,706 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:37,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-01-11 11:01:37,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-01-11 11:01:37,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2019-01-11 11:01:37,707 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand 37 states. [2019-01-11 11:01:37,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:37,875 INFO L93 Difference]: Finished difference Result 112 states and 115 transitions. [2019-01-11 11:01:37,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-01-11 11:01:37,876 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 72 [2019-01-11 11:01:37,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:37,876 INFO L225 Difference]: With dead ends: 112 [2019-01-11 11:01:37,877 INFO L226 Difference]: Without dead ends: 75 [2019-01-11 11:01:37,877 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2019-01-11 11:01:37,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-01-11 11:01:37,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2019-01-11 11:01:37,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2019-01-11 11:01:37,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2019-01-11 11:01:37,881 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 72 [2019-01-11 11:01:37,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:37,881 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2019-01-11 11:01:37,881 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-01-11 11:01:37,881 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2019-01-11 11:01:37,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2019-01-11 11:01:37,881 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:37,882 INFO L402 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1] [2019-01-11 11:01:37,882 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:37,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:37,882 INFO L82 PathProgramCache]: Analyzing trace with hash -1198231019, now seen corresponding path program 35 times [2019-01-11 11:01:37,882 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:37,883 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:37,883 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:37,883 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:37,883 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:37,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:38,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2019-01-11 11:01:38,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:38,490 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:38,490 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:38,490 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:38,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:38,490 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 [2019-01-11 11:01:38,498 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:01:38,498 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:01:38,918 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2019-01-11 11:01:38,918 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:38,924 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:38,935 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2019-01-11 11:01:38,935 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:40,445 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2019-01-11 11:01:40,464 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:40,464 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2019-01-11 11:01:40,464 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:40,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-01-11 11:01:40,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-01-11 11:01:40,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2019-01-11 11:01:40,465 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 38 states. [2019-01-11 11:01:40,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:40,611 INFO L93 Difference]: Finished difference Result 115 states and 118 transitions. [2019-01-11 11:01:40,612 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-01-11 11:01:40,612 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 74 [2019-01-11 11:01:40,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:40,613 INFO L225 Difference]: With dead ends: 115 [2019-01-11 11:01:40,613 INFO L226 Difference]: Without dead ends: 77 [2019-01-11 11:01:40,614 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2019-01-11 11:01:40,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-01-11 11:01:40,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2019-01-11 11:01:40,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-01-11 11:01:40,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2019-01-11 11:01:40,618 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 74 [2019-01-11 11:01:40,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:40,618 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2019-01-11 11:01:40,618 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-01-11 11:01:40,618 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2019-01-11 11:01:40,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2019-01-11 11:01:40,618 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:40,618 INFO L402 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1] [2019-01-11 11:01:40,619 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:40,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:40,619 INFO L82 PathProgramCache]: Analyzing trace with hash -2106305526, now seen corresponding path program 36 times [2019-01-11 11:01:40,619 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:40,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:40,620 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:40,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:40,620 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:40,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:41,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1332 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2019-01-11 11:01:41,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:41,365 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:41,365 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:41,365 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:41,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:41,365 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 [2019-01-11 11:01:41,377 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:01:41,377 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:01:41,426 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:01:41,426 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:41,429 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:41,440 INFO L134 CoverageAnalysis]: Checked inductivity of 1332 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2019-01-11 11:01:41,440 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:43,420 INFO L134 CoverageAnalysis]: Checked inductivity of 1332 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2019-01-11 11:01:43,438 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:43,439 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2019-01-11 11:01:43,439 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:43,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-01-11 11:01:43,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-01-11 11:01:43,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2019-01-11 11:01:43,440 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand 39 states. [2019-01-11 11:01:43,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:43,586 INFO L93 Difference]: Finished difference Result 118 states and 121 transitions. [2019-01-11 11:01:43,586 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-01-11 11:01:43,587 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 76 [2019-01-11 11:01:43,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:43,587 INFO L225 Difference]: With dead ends: 118 [2019-01-11 11:01:43,587 INFO L226 Difference]: Without dead ends: 79 [2019-01-11 11:01:43,588 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 [2019-01-11 11:01:43,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-01-11 11:01:43,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2019-01-11 11:01:43,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-01-11 11:01:43,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2019-01-11 11:01:43,591 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 76 [2019-01-11 11:01:43,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:43,592 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2019-01-11 11:01:43,592 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-01-11 11:01:43,592 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2019-01-11 11:01:43,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-01-11 11:01:43,592 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:43,592 INFO L402 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1] [2019-01-11 11:01:43,593 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:43,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:43,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1075627403, now seen corresponding path program 37 times [2019-01-11 11:01:43,593 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:43,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:43,594 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:43,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:43,594 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:43,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:44,466 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2019-01-11 11:01:44,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:44,466 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:44,466 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:44,466 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:44,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:44,467 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 [2019-01-11 11:01:44,475 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:44,475 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:01:44,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:44,528 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:44,538 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2019-01-11 11:01:44,539 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:46,093 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2019-01-11 11:01:46,111 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:46,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2019-01-11 11:01:46,111 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:46,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-01-11 11:01:46,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-01-11 11:01:46,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3003, Invalid=3003, Unknown=0, NotChecked=0, Total=6006 [2019-01-11 11:01:46,112 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 40 states. [2019-01-11 11:01:46,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:46,240 INFO L93 Difference]: Finished difference Result 121 states and 124 transitions. [2019-01-11 11:01:46,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2019-01-11 11:01:46,240 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 78 [2019-01-11 11:01:46,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:46,241 INFO L225 Difference]: With dead ends: 121 [2019-01-11 11:01:46,241 INFO L226 Difference]: Without dead ends: 81 [2019-01-11 11:01:46,242 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=3003, Invalid=3003, Unknown=0, NotChecked=0, Total=6006 [2019-01-11 11:01:46,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2019-01-11 11:01:46,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2019-01-11 11:01:46,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2019-01-11 11:01:46,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2019-01-11 11:01:46,246 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 78 [2019-01-11 11:01:46,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:46,246 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2019-01-11 11:01:46,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-01-11 11:01:46,247 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2019-01-11 11:01:46,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2019-01-11 11:01:46,247 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:46,247 INFO L402 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1] [2019-01-11 11:01:46,247 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:46,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:46,248 INFO L82 PathProgramCache]: Analyzing trace with hash 1898461994, now seen corresponding path program 38 times [2019-01-11 11:01:46,248 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:46,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:46,248 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:46,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:46,249 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:46,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:46,891 INFO L134 CoverageAnalysis]: Checked inductivity of 1482 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2019-01-11 11:01:46,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:46,891 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:46,891 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:46,891 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:46,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:46,892 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 [2019-01-11 11:01:46,900 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:01:46,900 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:01:47,407 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2019-01-11 11:01:47,407 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:47,412 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:47,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1482 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2019-01-11 11:01:47,425 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:49,362 INFO L134 CoverageAnalysis]: Checked inductivity of 1482 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2019-01-11 11:01:49,382 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:49,382 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2019-01-11 11:01:49,382 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:49,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2019-01-11 11:01:49,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2019-01-11 11:01:49,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2019-01-11 11:01:49,383 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand 41 states. [2019-01-11 11:01:49,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:49,526 INFO L93 Difference]: Finished difference Result 124 states and 127 transitions. [2019-01-11 11:01:49,527 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2019-01-11 11:01:49,527 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 80 [2019-01-11 11:01:49,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:49,528 INFO L225 Difference]: With dead ends: 124 [2019-01-11 11:01:49,528 INFO L226 Difference]: Without dead ends: 83 [2019-01-11 11:01:49,528 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2019-01-11 11:01:49,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-01-11 11:01:49,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2019-01-11 11:01:49,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-01-11 11:01:49,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2019-01-11 11:01:49,531 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 80 [2019-01-11 11:01:49,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:49,531 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2019-01-11 11:01:49,531 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2019-01-11 11:01:49,531 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2019-01-11 11:01:49,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2019-01-11 11:01:49,532 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:49,532 INFO L402 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1] [2019-01-11 11:01:49,532 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:49,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:49,532 INFO L82 PathProgramCache]: Analyzing trace with hash 1341848277, now seen corresponding path program 39 times [2019-01-11 11:01:49,532 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:49,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:49,533 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:49,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:49,533 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:49,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:50,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2019-01-11 11:01:50,262 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:50,262 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:50,262 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:50,263 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:50,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:50,263 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 [2019-01-11 11:01:50,271 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:01:50,271 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:01:50,321 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:01:50,321 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:50,324 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:50,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2019-01-11 11:01:50,332 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:52,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2019-01-11 11:01:52,126 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:52,126 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2019-01-11 11:01:52,126 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:52,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2019-01-11 11:01:52,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2019-01-11 11:01:52,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2019-01-11 11:01:52,127 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand 42 states. [2019-01-11 11:01:52,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:52,275 INFO L93 Difference]: Finished difference Result 127 states and 130 transitions. [2019-01-11 11:01:52,276 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-01-11 11:01:52,276 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 82 [2019-01-11 11:01:52,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:52,277 INFO L225 Difference]: With dead ends: 127 [2019-01-11 11:01:52,277 INFO L226 Difference]: Without dead ends: 85 [2019-01-11 11:01:52,277 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 [2019-01-11 11:01:52,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2019-01-11 11:01:52,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2019-01-11 11:01:52,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2019-01-11 11:01:52,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2019-01-11 11:01:52,282 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 82 [2019-01-11 11:01:52,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:52,282 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2019-01-11 11:01:52,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2019-01-11 11:01:52,282 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2019-01-11 11:01:52,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-01-11 11:01:52,283 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:52,283 INFO L402 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1] [2019-01-11 11:01:52,283 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:52,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:52,284 INFO L82 PathProgramCache]: Analyzing trace with hash -1280021942, now seen corresponding path program 40 times [2019-01-11 11:01:52,284 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:52,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:52,284 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:52,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:52,285 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:52,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:53,076 INFO L134 CoverageAnalysis]: Checked inductivity of 1640 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 820 trivial. 0 not checked. [2019-01-11 11:01:53,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:53,077 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:53,077 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:53,077 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:53,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:53,077 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 [2019-01-11 11:01:53,087 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:53,087 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:01:53,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:53,142 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:53,155 INFO L134 CoverageAnalysis]: Checked inductivity of 1640 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 820 trivial. 0 not checked. [2019-01-11 11:01:53,156 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:55,327 INFO L134 CoverageAnalysis]: Checked inductivity of 1640 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 820 trivial. 0 not checked. [2019-01-11 11:01:55,345 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:55,345 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 83 [2019-01-11 11:01:55,345 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:55,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-01-11 11:01:55,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-01-11 11:01:55,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2019-01-11 11:01:55,346 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand 43 states. [2019-01-11 11:01:55,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:55,492 INFO L93 Difference]: Finished difference Result 130 states and 133 transitions. [2019-01-11 11:01:55,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2019-01-11 11:01:55,493 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 84 [2019-01-11 11:01:55,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:55,494 INFO L225 Difference]: With dead ends: 130 [2019-01-11 11:01:55,494 INFO L226 Difference]: Without dead ends: 87 [2019-01-11 11:01:55,494 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2019-01-11 11:01:55,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2019-01-11 11:01:55,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2019-01-11 11:01:55,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2019-01-11 11:01:55,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2019-01-11 11:01:55,498 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 84 [2019-01-11 11:01:55,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:55,499 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2019-01-11 11:01:55,499 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2019-01-11 11:01:55,499 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2019-01-11 11:01:55,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-01-11 11:01:55,499 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:55,500 INFO L402 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1] [2019-01-11 11:01:55,500 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:55,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:55,500 INFO L82 PathProgramCache]: Analyzing trace with hash -214584523, now seen corresponding path program 41 times [2019-01-11 11:01:55,500 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:55,501 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:55,501 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:01:55,501 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:55,501 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:55,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:01:56,599 INFO L134 CoverageAnalysis]: Checked inductivity of 1722 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2019-01-11 11:01:56,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:56,599 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:01:56,599 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:01:56,599 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:01:56,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:01:56,599 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 [2019-01-11 11:01:56,608 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:01:56,608 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:01:57,223 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2019-01-11 11:01:57,224 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:01:57,230 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:01:57,243 INFO L134 CoverageAnalysis]: Checked inductivity of 1722 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2019-01-11 11:01:57,243 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:01:59,206 INFO L134 CoverageAnalysis]: Checked inductivity of 1722 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2019-01-11 11:01:59,226 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:01:59,226 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2019-01-11 11:01:59,227 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:01:59,227 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-01-11 11:01:59,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-01-11 11:01:59,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2019-01-11 11:01:59,228 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 44 states. [2019-01-11 11:01:59,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:01:59,368 INFO L93 Difference]: Finished difference Result 133 states and 136 transitions. [2019-01-11 11:01:59,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-01-11 11:01:59,368 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 86 [2019-01-11 11:01:59,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:01:59,369 INFO L225 Difference]: With dead ends: 133 [2019-01-11 11:01:59,369 INFO L226 Difference]: Without dead ends: 89 [2019-01-11 11:01:59,370 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2019-01-11 11:01:59,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-01-11 11:01:59,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2019-01-11 11:01:59,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2019-01-11 11:01:59,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2019-01-11 11:01:59,374 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 86 [2019-01-11 11:01:59,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:01:59,374 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2019-01-11 11:01:59,375 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-01-11 11:01:59,375 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2019-01-11 11:01:59,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-01-11 11:01:59,375 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:01:59,375 INFO L402 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1] [2019-01-11 11:01:59,375 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:01:59,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:01:59,376 INFO L82 PathProgramCache]: Analyzing trace with hash -2170518, now seen corresponding path program 42 times [2019-01-11 11:01:59,376 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:01:59,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:59,376 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:01:59,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:01:59,377 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:01:59,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:01,163 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2019-01-11 11:02:01,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:01,163 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:02:01,163 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:02:01,164 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:02:01,164 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:01,164 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 [2019-01-11 11:02:01,172 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:02:01,172 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:02:01,226 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:02:01,226 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:02:01,228 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:02:01,241 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2019-01-11 11:02:01,241 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:02:03,193 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2019-01-11 11:02:03,211 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:02:03,212 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2019-01-11 11:02:03,212 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:02:03,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2019-01-11 11:02:03,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2019-01-11 11:02:03,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2019-01-11 11:02:03,213 INFO L87 Difference]: Start difference. First operand 89 states and 90 transitions. Second operand 45 states. [2019-01-11 11:02:03,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:02:03,361 INFO L93 Difference]: Finished difference Result 136 states and 139 transitions. [2019-01-11 11:02:03,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2019-01-11 11:02:03,361 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 88 [2019-01-11 11:02:03,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:02:03,362 INFO L225 Difference]: With dead ends: 136 [2019-01-11 11:02:03,362 INFO L226 Difference]: Without dead ends: 91 [2019-01-11 11:02:03,363 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2019-01-11 11:02:03,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-01-11 11:02:03,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2019-01-11 11:02:03,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-01-11 11:02:03,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2019-01-11 11:02:03,367 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 88 [2019-01-11 11:02:03,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:02:03,367 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2019-01-11 11:02:03,368 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2019-01-11 11:02:03,368 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2019-01-11 11:02:03,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2019-01-11 11:02:03,368 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:02:03,368 INFO L402 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1] [2019-01-11 11:02:03,369 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:02:03,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:02:03,369 INFO L82 PathProgramCache]: Analyzing trace with hash -378707051, now seen corresponding path program 43 times [2019-01-11 11:02:03,369 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:02:03,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:03,370 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:02:03,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:03,370 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:02:03,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:04,601 INFO L134 CoverageAnalysis]: Checked inductivity of 1892 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2019-01-11 11:02:04,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:04,601 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:02:04,601 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:02:04,601 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:02:04,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:04,602 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 [2019-01-11 11:02:04,609 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:02:04,609 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:02:04,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:04,669 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:02:04,679 INFO L134 CoverageAnalysis]: Checked inductivity of 1892 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2019-01-11 11:02:04,679 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:02:06,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1892 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2019-01-11 11:02:06,755 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:02:06,755 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 89 [2019-01-11 11:02:06,756 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:02:06,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-01-11 11:02:06,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-01-11 11:02:06,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4005, Invalid=4005, Unknown=0, NotChecked=0, Total=8010 [2019-01-11 11:02:06,757 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand 46 states. [2019-01-11 11:02:07,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:02:07,366 INFO L93 Difference]: Finished difference Result 139 states and 142 transitions. [2019-01-11 11:02:07,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-01-11 11:02:07,367 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 90 [2019-01-11 11:02:07,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:02:07,367 INFO L225 Difference]: With dead ends: 139 [2019-01-11 11:02:07,367 INFO L226 Difference]: Without dead ends: 93 [2019-01-11 11:02:07,368 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4005, Invalid=4005, Unknown=0, NotChecked=0, Total=8010 [2019-01-11 11:02:07,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2019-01-11 11:02:07,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2019-01-11 11:02:07,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2019-01-11 11:02:07,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2019-01-11 11:02:07,371 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 90 [2019-01-11 11:02:07,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:02:07,371 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2019-01-11 11:02:07,371 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2019-01-11 11:02:07,371 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2019-01-11 11:02:07,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2019-01-11 11:02:07,371 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:02:07,372 INFO L402 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1] [2019-01-11 11:02:07,372 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:02:07,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:02:07,372 INFO L82 PathProgramCache]: Analyzing trace with hash -1779588982, now seen corresponding path program 44 times [2019-01-11 11:02:07,372 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:02:07,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:07,373 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:02:07,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:07,373 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:02:07,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:09,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2019-01-11 11:02:09,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:09,115 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:02:09,115 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:02:09,115 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:02:09,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:09,116 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 [2019-01-11 11:02:09,125 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:02:09,125 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:02:09,885 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2019-01-11 11:02:09,885 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:02:09,891 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:02:09,903 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2019-01-11 11:02:09,903 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:02:12,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2019-01-11 11:02:12,084 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:02:12,084 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 47, 47] total 92 [2019-01-11 11:02:12,085 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:02:12,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-01-11 11:02:12,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-01-11 11:02:12,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2019-01-11 11:02:12,086 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand 47 states. [2019-01-11 11:02:12,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:02:12,878 INFO L93 Difference]: Finished difference Result 142 states and 145 transitions. [2019-01-11 11:02:12,879 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-01-11 11:02:12,879 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 92 [2019-01-11 11:02:12,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:02:12,880 INFO L225 Difference]: With dead ends: 142 [2019-01-11 11:02:12,880 INFO L226 Difference]: Without dead ends: 95 [2019-01-11 11:02:12,881 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2019-01-11 11:02:12,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2019-01-11 11:02:12,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2019-01-11 11:02:12,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2019-01-11 11:02:12,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 96 transitions. [2019-01-11 11:02:12,885 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 96 transitions. Word has length 92 [2019-01-11 11:02:12,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:02:12,885 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 96 transitions. [2019-01-11 11:02:12,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-01-11 11:02:12,885 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 96 transitions. [2019-01-11 11:02:12,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2019-01-11 11:02:12,886 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:02:12,886 INFO L402 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1] [2019-01-11 11:02:12,886 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:02:12,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:02:12,886 INFO L82 PathProgramCache]: Analyzing trace with hash -939783179, now seen corresponding path program 45 times [2019-01-11 11:02:12,886 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:02:12,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:12,887 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:02:12,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:12,887 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:02:12,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:14,578 INFO L134 CoverageAnalysis]: Checked inductivity of 2070 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2019-01-11 11:02:14,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:14,578 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:02:14,579 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:02:14,579 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:02:14,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:14,579 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 [2019-01-11 11:02:14,599 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:02:14,599 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:02:14,671 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:02:14,671 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:02:14,675 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:02:14,693 INFO L134 CoverageAnalysis]: Checked inductivity of 2070 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2019-01-11 11:02:14,693 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:02:17,837 INFO L134 CoverageAnalysis]: Checked inductivity of 2070 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2019-01-11 11:02:17,855 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:02:17,855 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2019-01-11 11:02:17,855 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:02:17,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2019-01-11 11:02:17,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2019-01-11 11:02:17,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2019-01-11 11:02:17,856 INFO L87 Difference]: Start difference. First operand 95 states and 96 transitions. Second operand 48 states. [2019-01-11 11:02:18,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:02:18,033 INFO L93 Difference]: Finished difference Result 145 states and 148 transitions. [2019-01-11 11:02:18,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-01-11 11:02:18,033 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 94 [2019-01-11 11:02:18,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:02:18,034 INFO L225 Difference]: With dead ends: 145 [2019-01-11 11:02:18,034 INFO L226 Difference]: Without dead ends: 97 [2019-01-11 11:02:18,035 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2019-01-11 11:02:18,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2019-01-11 11:02:18,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2019-01-11 11:02:18,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2019-01-11 11:02:18,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2019-01-11 11:02:18,038 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 94 [2019-01-11 11:02:18,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:02:18,039 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2019-01-11 11:02:18,039 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2019-01-11 11:02:18,039 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2019-01-11 11:02:18,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2019-01-11 11:02:18,039 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:02:18,039 INFO L402 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1] [2019-01-11 11:02:18,039 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:02:18,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:02:18,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1599690838, now seen corresponding path program 46 times [2019-01-11 11:02:18,040 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:02:18,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:18,040 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:02:18,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:18,041 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:02:18,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:19,227 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2019-01-11 11:02:19,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:19,227 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:02:19,227 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:02:19,227 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:02:19,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:19,227 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 [2019-01-11 11:02:19,236 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:02:19,236 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:02:19,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:19,299 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:02:19,313 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2019-01-11 11:02:19,314 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:02:21,667 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2019-01-11 11:02:21,686 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:02:21,686 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2019-01-11 11:02:21,686 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:02:21,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2019-01-11 11:02:21,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2019-01-11 11:02:21,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2019-01-11 11:02:21,688 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 49 states. [2019-01-11 11:02:21,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:02:21,951 INFO L93 Difference]: Finished difference Result 148 states and 151 transitions. [2019-01-11 11:02:21,951 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2019-01-11 11:02:21,951 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 96 [2019-01-11 11:02:21,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:02:21,952 INFO L225 Difference]: With dead ends: 148 [2019-01-11 11:02:21,952 INFO L226 Difference]: Without dead ends: 99 [2019-01-11 11:02:21,953 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 [2019-01-11 11:02:21,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2019-01-11 11:02:21,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2019-01-11 11:02:21,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2019-01-11 11:02:21,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2019-01-11 11:02:21,955 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 96 [2019-01-11 11:02:21,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:02:21,956 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2019-01-11 11:02:21,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2019-01-11 11:02:21,956 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2019-01-11 11:02:21,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2019-01-11 11:02:21,956 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:02:21,956 INFO L402 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1] [2019-01-11 11:02:21,957 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:02:21,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:02:21,957 INFO L82 PathProgramCache]: Analyzing trace with hash 431729749, now seen corresponding path program 47 times [2019-01-11 11:02:21,957 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:02:21,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:21,958 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:02:21,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:21,958 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:02:21,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:22,957 INFO L134 CoverageAnalysis]: Checked inductivity of 2256 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 1128 trivial. 0 not checked. [2019-01-11 11:02:22,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:22,957 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:02:22,957 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:02:22,957 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:02:22,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:22,957 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 [2019-01-11 11:02:22,965 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:02:22,965 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:02:24,603 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2019-01-11 11:02:24,604 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:02:24,613 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:02:24,629 INFO L134 CoverageAnalysis]: Checked inductivity of 2256 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 1128 trivial. 0 not checked. [2019-01-11 11:02:24,629 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:02:27,307 INFO L134 CoverageAnalysis]: Checked inductivity of 2256 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 1128 trivial. 0 not checked. [2019-01-11 11:02:27,329 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:02:27,329 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2019-01-11 11:02:27,329 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:02:27,329 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2019-01-11 11:02:27,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2019-01-11 11:02:27,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2019-01-11 11:02:27,330 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand 50 states. [2019-01-11 11:02:27,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:02:27,683 INFO L93 Difference]: Finished difference Result 151 states and 154 transitions. [2019-01-11 11:02:27,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-01-11 11:02:27,683 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 98 [2019-01-11 11:02:27,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:02:27,684 INFO L225 Difference]: With dead ends: 151 [2019-01-11 11:02:27,684 INFO L226 Difference]: Without dead ends: 101 [2019-01-11 11:02:27,685 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2019-01-11 11:02:27,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2019-01-11 11:02:27,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2019-01-11 11:02:27,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2019-01-11 11:02:27,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 102 transitions. [2019-01-11 11:02:27,688 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 102 transitions. Word has length 98 [2019-01-11 11:02:27,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:02:27,688 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 102 transitions. [2019-01-11 11:02:27,688 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2019-01-11 11:02:27,688 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 102 transitions. [2019-01-11 11:02:27,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2019-01-11 11:02:27,689 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:02:27,689 INFO L402 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1] [2019-01-11 11:02:27,689 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:02:27,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:02:27,689 INFO L82 PathProgramCache]: Analyzing trace with hash -1789921590, now seen corresponding path program 48 times [2019-01-11 11:02:27,689 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:02:27,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:27,690 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:02:27,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:27,690 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:02:27,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:28,653 INFO L134 CoverageAnalysis]: Checked inductivity of 2352 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2019-01-11 11:02:28,653 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:28,653 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:02:28,653 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:02:28,654 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:02:28,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:28,654 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 [2019-01-11 11:02:28,661 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:02:28,661 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:02:28,748 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:02:28,748 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:02:28,752 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:02:28,764 INFO L134 CoverageAnalysis]: Checked inductivity of 2352 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2019-01-11 11:02:28,764 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:02:31,536 INFO L134 CoverageAnalysis]: Checked inductivity of 2352 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2019-01-11 11:02:31,554 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:02:31,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 99 [2019-01-11 11:02:31,554 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:02:31,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2019-01-11 11:02:31,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2019-01-11 11:02:31,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2019-01-11 11:02:31,556 INFO L87 Difference]: Start difference. First operand 101 states and 102 transitions. Second operand 51 states. [2019-01-11 11:02:31,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:02:31,815 INFO L93 Difference]: Finished difference Result 154 states and 157 transitions. [2019-01-11 11:02:31,816 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-01-11 11:02:31,816 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 100 [2019-01-11 11:02:31,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:02:31,817 INFO L225 Difference]: With dead ends: 154 [2019-01-11 11:02:31,817 INFO L226 Difference]: Without dead ends: 103 [2019-01-11 11:02:31,818 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2019-01-11 11:02:31,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2019-01-11 11:02:31,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2019-01-11 11:02:31,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2019-01-11 11:02:31,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2019-01-11 11:02:31,822 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 100 [2019-01-11 11:02:31,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:02:31,822 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2019-01-11 11:02:31,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2019-01-11 11:02:31,822 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2019-01-11 11:02:31,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2019-01-11 11:02:31,822 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:02:31,823 INFO L402 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1] [2019-01-11 11:02:31,823 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:02:31,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:02:31,823 INFO L82 PathProgramCache]: Analyzing trace with hash -16366411, now seen corresponding path program 49 times [2019-01-11 11:02:31,823 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:02:31,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:31,824 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:02:31,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:31,824 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:02:31,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:32,952 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2019-01-11 11:02:32,953 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:32,953 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:02:32,953 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:02:32,953 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:02:32,953 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:32,953 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 [2019-01-11 11:02:32,961 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:02:32,961 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:02:33,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:33,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:02:33,042 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2019-01-11 11:02:33,042 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:02:35,854 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2019-01-11 11:02:35,873 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:02:35,873 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 101 [2019-01-11 11:02:35,873 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:02:35,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2019-01-11 11:02:35,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2019-01-11 11:02:35,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2019-01-11 11:02:35,875 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand 52 states. [2019-01-11 11:02:36,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:02:36,080 INFO L93 Difference]: Finished difference Result 157 states and 160 transitions. [2019-01-11 11:02:36,080 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2019-01-11 11:02:36,081 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 102 [2019-01-11 11:02:36,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:02:36,081 INFO L225 Difference]: With dead ends: 157 [2019-01-11 11:02:36,081 INFO L226 Difference]: Without dead ends: 105 [2019-01-11 11:02:36,082 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2019-01-11 11:02:36,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2019-01-11 11:02:36,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2019-01-11 11:02:36,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2019-01-11 11:02:36,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 106 transitions. [2019-01-11 11:02:36,086 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 106 transitions. Word has length 102 [2019-01-11 11:02:36,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:02:36,086 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 106 transitions. [2019-01-11 11:02:36,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2019-01-11 11:02:36,087 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 106 transitions. [2019-01-11 11:02:36,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-01-11 11:02:36,087 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:02:36,087 INFO L402 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1] [2019-01-11 11:02:36,088 INFO L423 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:02:36,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:02:36,088 INFO L82 PathProgramCache]: Analyzing trace with hash -1817211414, now seen corresponding path program 50 times [2019-01-11 11:02:36,088 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:02:36,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:36,089 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:02:36,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:36,089 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:02:36,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:37,171 INFO L134 CoverageAnalysis]: Checked inductivity of 2550 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 1275 trivial. 0 not checked. [2019-01-11 11:02:37,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:37,171 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:02:37,171 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:02:37,171 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:02:37,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:37,172 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 [2019-01-11 11:02:37,182 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:02:37,182 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:02:38,245 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2019-01-11 11:02:38,245 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:02:38,255 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:02:38,285 INFO L134 CoverageAnalysis]: Checked inductivity of 2550 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 1275 trivial. 0 not checked. [2019-01-11 11:02:38,285 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:02:41,194 INFO L134 CoverageAnalysis]: Checked inductivity of 2550 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 1275 trivial. 0 not checked. [2019-01-11 11:02:41,216 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:02:41,216 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2019-01-11 11:02:41,216 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:02:41,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2019-01-11 11:02:41,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2019-01-11 11:02:41,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2019-01-11 11:02:41,218 INFO L87 Difference]: Start difference. First operand 105 states and 106 transitions. Second operand 53 states. [2019-01-11 11:02:41,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:02:41,545 INFO L93 Difference]: Finished difference Result 160 states and 163 transitions. [2019-01-11 11:02:41,545 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2019-01-11 11:02:41,545 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 104 [2019-01-11 11:02:41,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:02:41,546 INFO L225 Difference]: With dead ends: 160 [2019-01-11 11:02:41,546 INFO L226 Difference]: Without dead ends: 107 [2019-01-11 11:02:41,548 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2019-01-11 11:02:41,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2019-01-11 11:02:41,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2019-01-11 11:02:41,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2019-01-11 11:02:41,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2019-01-11 11:02:41,553 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 104 [2019-01-11 11:02:41,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:02:41,553 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2019-01-11 11:02:41,554 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2019-01-11 11:02:41,554 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2019-01-11 11:02:41,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2019-01-11 11:02:41,554 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:02:41,554 INFO L402 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1] [2019-01-11 11:02:41,555 INFO L423 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:02:41,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:02:41,555 INFO L82 PathProgramCache]: Analyzing trace with hash -843721451, now seen corresponding path program 51 times [2019-01-11 11:02:41,555 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:02:41,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:41,556 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:02:41,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:41,556 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:02:41,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:43,101 INFO L134 CoverageAnalysis]: Checked inductivity of 2652 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2019-01-11 11:02:43,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:43,102 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:02:43,102 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:02:43,102 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:02:43,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:43,102 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 [2019-01-11 11:02:43,111 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-11 11:02:43,112 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-11 11:02:43,177 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-11 11:02:43,178 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:02:43,180 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:02:43,193 INFO L134 CoverageAnalysis]: Checked inductivity of 2652 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2019-01-11 11:02:43,193 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:02:46,164 INFO L134 CoverageAnalysis]: Checked inductivity of 2652 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2019-01-11 11:02:46,182 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:02:46,183 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2019-01-11 11:02:46,183 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:02:46,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2019-01-11 11:02:46,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2019-01-11 11:02:46,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2019-01-11 11:02:46,185 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand 54 states. [2019-01-11 11:02:46,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:02:46,435 INFO L93 Difference]: Finished difference Result 163 states and 166 transitions. [2019-01-11 11:02:46,435 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2019-01-11 11:02:46,435 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 106 [2019-01-11 11:02:46,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:02:46,436 INFO L225 Difference]: With dead ends: 163 [2019-01-11 11:02:46,436 INFO L226 Difference]: Without dead ends: 109 [2019-01-11 11:02:46,436 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2019-01-11 11:02:46,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2019-01-11 11:02:46,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2019-01-11 11:02:46,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2019-01-11 11:02:46,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2019-01-11 11:02:46,441 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 106 [2019-01-11 11:02:46,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:02:46,441 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2019-01-11 11:02:46,442 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2019-01-11 11:02:46,442 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2019-01-11 11:02:46,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2019-01-11 11:02:46,442 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:02:46,442 INFO L402 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1] [2019-01-11 11:02:46,443 INFO L423 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:02:46,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:02:46,443 INFO L82 PathProgramCache]: Analyzing trace with hash -972329718, now seen corresponding path program 52 times [2019-01-11 11:02:46,443 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:02:46,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:46,444 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-11 11:02:46,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:46,444 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:02:46,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:47,904 INFO L134 CoverageAnalysis]: Checked inductivity of 2756 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 1378 trivial. 0 not checked. [2019-01-11 11:02:47,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:47,905 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:02:47,905 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:02:47,905 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:02:47,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:47,905 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 [2019-01-11 11:02:47,914 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:02:47,914 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-11 11:02:47,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:47,986 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:02:48,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2756 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 1378 trivial. 0 not checked. [2019-01-11 11:02:48,001 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-11 11:02:51,084 INFO L134 CoverageAnalysis]: Checked inductivity of 2756 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 1378 trivial. 0 not checked. [2019-01-11 11:02:51,102 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-11 11:02:51,102 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 107 [2019-01-11 11:02:51,102 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-11 11:02:51,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2019-01-11 11:02:51,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2019-01-11 11:02:51,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5778, Invalid=5778, Unknown=0, NotChecked=0, Total=11556 [2019-01-11 11:02:51,104 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 55 states. [2019-01-11 11:02:51,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-11 11:02:51,358 INFO L93 Difference]: Finished difference Result 166 states and 169 transitions. [2019-01-11 11:02:51,358 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-01-11 11:02:51,358 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 108 [2019-01-11 11:02:51,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-11 11:02:51,359 INFO L225 Difference]: With dead ends: 166 [2019-01-11 11:02:51,359 INFO L226 Difference]: Without dead ends: 111 [2019-01-11 11:02:51,360 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=5778, Invalid=5778, Unknown=0, NotChecked=0, Total=11556 [2019-01-11 11:02:51,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2019-01-11 11:02:51,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2019-01-11 11:02:51,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2019-01-11 11:02:51,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 112 transitions. [2019-01-11 11:02:51,364 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 112 transitions. Word has length 108 [2019-01-11 11:02:51,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-11 11:02:51,364 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 112 transitions. [2019-01-11 11:02:51,364 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2019-01-11 11:02:51,364 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 112 transitions. [2019-01-11 11:02:51,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2019-01-11 11:02:51,364 INFO L394 BasicCegarLoop]: Found error trace [2019-01-11 11:02:51,364 INFO L402 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1] [2019-01-11 11:02:51,365 INFO L423 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-11 11:02:51,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-11 11:02:51,365 INFO L82 PathProgramCache]: Analyzing trace with hash -1323016843, now seen corresponding path program 53 times [2019-01-11 11:02:51,365 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-11 11:02:51,365 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:51,365 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-11 11:02:51,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-11 11:02:51,366 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-11 11:02:51,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-11 11:02:52,645 INFO L134 CoverageAnalysis]: Checked inductivity of 2862 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 1431 trivial. 0 not checked. [2019-01-11 11:02:52,645 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:52,645 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-11 11:02:52,645 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-11 11:02:52,646 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-11 11:02:52,646 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-11 11:02:52,646 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 [2019-01-11 11:02:52,654 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-11 11:02:52,654 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-11 11:02:54,128 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2019-01-11 11:02:54,128 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-11 11:02:54,138 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-11 11:02:54,158 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 [2019-01-11 11:02:54,159 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-11 11:02:54,171 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-11 11:02:54,171 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2019-01-11 11:04:59,999 WARN L521 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-01-11 11:05:00,001 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:8192 -smt2 -in -t:2000)Received EOF on stdin. No stderr output. 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$do_action(Parser.java:1427) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser.do_action(Parser.java:630) at com.github.jhoenicke.javacup.runtime.LRParser.parse(LRParser.java:419) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:205) ... 39 more [2019-01-11 11:05:00,006 INFO L168 Benchmark]: Toolchain (without parser) took 249725.42 ms. Allocated memory was 133.7 MB in the beginning and 947.4 MB in the end (delta: 813.7 MB). Free memory was 105.7 MB in the beginning and 778.0 MB in the end (delta: -672.3 MB). Peak memory consumption was 141.4 MB. Max. memory is 7.1 GB. [2019-01-11 11:05:00,008 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.19 ms. Allocated memory is still 133.7 MB. Free memory is still 106.9 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-01-11 11:05:00,008 INFO L168 Benchmark]: Boogie Procedure Inliner took 37.89 ms. Allocated memory is still 133.7 MB. Free memory was 105.5 MB in the beginning and 103.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 7.1 GB. [2019-01-11 11:05:00,008 INFO L168 Benchmark]: Boogie Preprocessor took 23.15 ms. Allocated memory is still 133.7 MB. Free memory was 103.7 MB in the beginning and 102.8 MB in the end (delta: 936.3 kB). Peak memory consumption was 936.3 kB. Max. memory is 7.1 GB. [2019-01-11 11:05:00,009 INFO L168 Benchmark]: RCFGBuilder took 357.76 ms. Allocated memory is still 133.7 MB. Free memory was 102.8 MB in the beginning and 93.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2019-01-11 11:05:00,010 INFO L168 Benchmark]: TraceAbstraction took 249300.69 ms. Allocated memory was 133.7 MB in the beginning and 947.4 MB in the end (delta: 813.7 MB). Free memory was 93.3 MB in the beginning and 778.0 MB in the end (delta: -684.7 MB). Peak memory consumption was 129.0 MB. Max. memory is 7.1 GB. [2019-01-11 11:05:00,013 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.19 ms. Allocated memory is still 133.7 MB. Free memory is still 106.9 MB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 37.89 ms. Allocated memory is still 133.7 MB. Free memory was 105.5 MB in the beginning and 103.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.15 ms. Allocated memory is still 133.7 MB. Free memory was 103.7 MB in the beginning and 102.8 MB in the end (delta: 936.3 kB). Peak memory consumption was 936.3 kB. Max. memory is 7.1 GB. * RCFGBuilder took 357.76 ms. Allocated memory is still 133.7 MB. Free memory was 102.8 MB in the beginning and 93.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 249300.69 ms. Allocated memory was 133.7 MB in the beginning and 947.4 MB in the end (delta: 813.7 MB). Free memory was 93.3 MB in the beginning and 778.0 MB in the end (delta: -684.7 MB). Peak memory consumption was 129.0 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:8192 -smt2 -in -t:2000)Received EOF on stdin. No stderr output. de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: External (z3 SMTLIB2_COMPLIANT=true -memory:8192 -smt2 -in -t:2000)Received EOF on stdin. No stderr output.: 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...