java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_oct_cong.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/seq.i_4.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 18:01:15,978 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 18:01:15,980 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 18:01:15,993 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2018-12-03 18:01:16,038 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_oct_cong.epf [2018-12-03 18:01:16,050 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 18:01:16,053 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 18:01:16,054 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 18:01:16,055 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 18:01:16,055 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 18:01:16,055 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 18:01:16,055 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 18:01:16,055 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 18:01:16,056 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 18:01:16,056 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 18:01:16,056 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 18:01:16,057 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 18:01:16,057 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 18:01:16,058 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 18:01:16,058 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 18:01:16,058 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 18:01:16,058 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 18:01:16,058 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 18:01:16,060 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 18:01:16,061 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 18:01:16,061 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 18:01:16,061 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 18:01:16,061 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 18:01:16,061 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 18:01:16,062 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 18:01:16,062 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 18:01:16,062 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 18:01:16,063 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 18:01:16,063 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 18:01:16,063 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 18:01:16,063 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 18:01:16,064 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 18:01:16,064 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 18:01:16,064 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 18:01:16,064 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 18:01:16,064 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 18:01:16,065 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 18:01:16,065 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 18:01:16,065 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 18:01:16,112 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 18:01:16,129 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 18:01:16,133 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 18:01:16,135 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 18:01:16,135 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 18:01:16,136 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/seq.i_4.bpl [2018-12-03 18:01:16,136 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/seq.i_4.bpl' [2018-12-03 18:01:16,175 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 18:01:16,177 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 18:01:16,178 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 18:01:16,178 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 18:01:16,179 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 18:01:16,198 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:01:16" (1/1) ... [2018-12-03 18:01:16,208 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:01:16" (1/1) ... [2018-12-03 18:01:16,217 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 18:01:16,218 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 18:01:16,218 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 18:01:16,219 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 18:01:16,231 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:01:16" (1/1) ... [2018-12-03 18:01:16,231 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:01:16" (1/1) ... [2018-12-03 18:01:16,232 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:01:16" (1/1) ... [2018-12-03 18:01:16,232 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:01:16" (1/1) ... [2018-12-03 18:01:16,237 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:01:16" (1/1) ... [2018-12-03 18:01:16,239 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:01:16" (1/1) ... [2018-12-03 18:01:16,240 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:01:16" (1/1) ... [2018-12-03 18:01:16,242 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 18:01:16,242 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 18:01:16,242 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 18:01:16,243 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 18:01:16,244 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:01:16" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 18:01:16,317 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 18:01:16,317 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 18:01:16,590 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 18:01:16,590 INFO L280 CfgBuilder]: Removed 3 assue(true) statements. [2018-12-03 18:01:16,591 INFO L202 PluginConnector]: Adding new model seq.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 06:01:16 BoogieIcfgContainer [2018-12-03 18:01:16,591 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 18:01:16,593 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 18:01:16,593 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 18:01:16,596 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 18:01:16,597 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:01:16" (1/2) ... [2018-12-03 18:01:16,598 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@409ebee2 and model type seq.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 06:01:16, skipping insertion in model container [2018-12-03 18:01:16,598 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "seq.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 06:01:16" (2/2) ... [2018-12-03 18:01:16,600 INFO L112 eAbstractionObserver]: Analyzing ICFG seq.i_4.bpl [2018-12-03 18:01:16,611 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 18:01:16,619 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 18:01:16,638 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 18:01:16,676 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 18:01:16,677 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 18:01:16,677 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 18:01:16,677 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 18:01:16,677 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 18:01:16,677 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 18:01:16,678 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 18:01:16,678 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 18:01:16,694 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states. [2018-12-03 18:01:16,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-03 18:01:16,701 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:16,702 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-12-03 18:01:16,705 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:16,712 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:16,713 INFO L82 PathProgramCache]: Analyzing trace with hash 28787175, now seen corresponding path program 1 times [2018-12-03 18:01:16,715 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:16,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:16,776 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:16,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:16,776 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:16,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:16,992 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:16,995 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 18:01:16,996 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 18:01:16,996 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 18:01:17,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 18:01:17,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 18:01:17,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 18:01:17,023 INFO L87 Difference]: Start difference. First operand 8 states. Second operand 4 states. [2018-12-03 18:01:17,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:17,188 INFO L93 Difference]: Finished difference Result 14 states and 17 transitions. [2018-12-03 18:01:17,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 18:01:17,191 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 5 [2018-12-03 18:01:17,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:17,203 INFO L225 Difference]: With dead ends: 14 [2018-12-03 18:01:17,203 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 18:01:17,207 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-12-03 18:01:17,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 18:01:17,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 18:01:17,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 18:01:17,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2018-12-03 18:01:17,247 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 5 [2018-12-03 18:01:17,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:17,247 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2018-12-03 18:01:17,248 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 18:01:17,248 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2018-12-03 18:01:17,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 18:01:17,248 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:17,249 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-12-03 18:01:17,249 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:17,249 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:17,250 INFO L82 PathProgramCache]: Analyzing trace with hash 894126352, now seen corresponding path program 1 times [2018-12-03 18:01:17,250 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:17,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:17,252 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:17,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:17,252 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:17,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:17,363 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:17,363 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 18:01:17,364 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-12-03 18:01:17,364 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 18:01:17,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 18:01:17,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 18:01:17,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-12-03 18:01:17,367 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand 5 states. [2018-12-03 18:01:17,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:17,528 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2018-12-03 18:01:17,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 18:01:17,529 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 6 [2018-12-03 18:01:17,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:17,529 INFO L225 Difference]: With dead ends: 15 [2018-12-03 18:01:17,530 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 18:01:17,531 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2018-12-03 18:01:17,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 18:01:17,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 9. [2018-12-03 18:01:17,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 18:01:17,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2018-12-03 18:01:17,535 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2018-12-03 18:01:17,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:17,536 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2018-12-03 18:01:17,536 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 18:01:17,536 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2018-12-03 18:01:17,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 18:01:17,537 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:17,537 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2018-12-03 18:01:17,538 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:17,538 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:17,538 INFO L82 PathProgramCache]: Analyzing trace with hash 262017386, now seen corresponding path program 1 times [2018-12-03 18:01:17,538 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:17,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:17,540 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:17,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:17,540 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:17,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:17,690 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:17,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:17,691 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:17,692 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 9 with the following transitions: [2018-12-03 18:01:17,694 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9], [13], [15], [17] [2018-12-03 18:01:17,761 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 18:01:17,761 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 18:01:19,404 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 18:01:19,406 INFO L272 AbstractInterpreter]: Visited 7 different actions 167 times. Merged at 6 different actions 142 times. Widened at 5 different actions 97 times. Found 19 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 18:01:19,442 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:19,444 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 18:01:19,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:19,444 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:19,460 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:19,461 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:01:19,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:19,504 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:19,906 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:19,906 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:20,119 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:20,147 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:20,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-12-03 18:01:20,148 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:20,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 18:01:20,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 18:01:20,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2018-12-03 18:01:20,150 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 10 states. [2018-12-03 18:01:20,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:20,432 INFO L93 Difference]: Finished difference Result 17 states and 19 transitions. [2018-12-03 18:01:20,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 18:01:20,433 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 8 [2018-12-03 18:01:20,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:20,434 INFO L225 Difference]: With dead ends: 17 [2018-12-03 18:01:20,434 INFO L226 Difference]: Without dead ends: 10 [2018-12-03 18:01:20,435 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 8 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2018-12-03 18:01:20,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-12-03 18:01:20,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-12-03 18:01:20,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-12-03 18:01:20,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2018-12-03 18:01:20,438 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 8 [2018-12-03 18:01:20,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:20,439 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2018-12-03 18:01:20,439 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 18:01:20,439 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2018-12-03 18:01:20,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 18:01:20,440 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:20,440 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2018-12-03 18:01:20,441 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:20,441 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:20,441 INFO L82 PathProgramCache]: Analyzing trace with hash 1187728801, now seen corresponding path program 2 times [2018-12-03 18:01:20,441 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:20,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:20,442 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:20,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:20,442 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:20,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:20,562 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:20,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:20,563 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:20,563 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:20,564 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:20,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:20,564 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:20,574 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:01:20,575 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:01:20,589 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-12-03 18:01:20,589 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:20,592 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:20,639 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:20,639 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:20,727 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:20,747 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:20,747 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 7 [2018-12-03 18:01:20,747 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:20,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 18:01:20,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 18:01:20,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-12-03 18:01:20,749 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand 8 states. [2018-12-03 18:01:21,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:21,028 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2018-12-03 18:01:21,028 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 18:01:21,029 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 9 [2018-12-03 18:01:21,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:21,029 INFO L225 Difference]: With dead ends: 18 [2018-12-03 18:01:21,030 INFO L226 Difference]: Without dead ends: 16 [2018-12-03 18:01:21,030 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 13 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2018-12-03 18:01:21,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-12-03 18:01:21,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 12. [2018-12-03 18:01:21,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-12-03 18:01:21,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2018-12-03 18:01:21,035 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 9 [2018-12-03 18:01:21,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:21,035 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2018-12-03 18:01:21,035 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 18:01:21,036 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2018-12-03 18:01:21,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-12-03 18:01:21,036 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:21,036 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2018-12-03 18:01:21,037 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:21,037 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:21,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1053870661, now seen corresponding path program 3 times [2018-12-03 18:01:21,037 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:21,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:21,039 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:21,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:21,039 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:21,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:21,271 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:21,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:21,271 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:21,272 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:21,272 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:21,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:21,272 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:21,281 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:01:21,281 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:01:21,300 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:01:21,300 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:21,303 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:21,473 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:21,473 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:21,554 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:21,575 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:21,575 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-12-03 18:01:21,575 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:21,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 18:01:21,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 18:01:21,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:01:21,577 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 14 states. [2018-12-03 18:01:21,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:21,715 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2018-12-03 18:01:21,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 18:01:21,715 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 11 [2018-12-03 18:01:21,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:21,716 INFO L225 Difference]: With dead ends: 22 [2018-12-03 18:01:21,716 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 18:01:21,717 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 10 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2018-12-03 18:01:21,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 18:01:21,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-12-03 18:01:21,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-12-03 18:01:21,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-12-03 18:01:21,720 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2018-12-03 18:01:21,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:21,720 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-12-03 18:01:21,720 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 18:01:21,721 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-12-03 18:01:21,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 18:01:21,721 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:21,721 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1] [2018-12-03 18:01:21,722 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:21,722 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:21,722 INFO L82 PathProgramCache]: Analyzing trace with hash -1170114012, now seen corresponding path program 4 times [2018-12-03 18:01:21,722 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:21,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:21,723 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:21,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:21,724 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:21,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:21,927 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:21,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:21,928 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:21,928 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:21,928 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:21,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:21,929 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:21,939 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:21,940 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:01:21,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:21,965 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:21,982 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:21,983 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:22,044 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:22,064 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:22,065 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 8 [2018-12-03 18:01:22,065 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:22,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 18:01:22,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 18:01:22,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-12-03 18:01:22,066 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 9 states. [2018-12-03 18:01:22,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:22,242 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2018-12-03 18:01:22,243 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 18:01:22,243 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 12 [2018-12-03 18:01:22,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:22,244 INFO L225 Difference]: With dead ends: 21 [2018-12-03 18:01:22,244 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 18:01:22,245 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 6 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2018-12-03 18:01:22,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 18:01:22,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2018-12-03 18:01:22,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 18:01:22,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-12-03 18:01:22,251 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2018-12-03 18:01:22,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:22,251 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-12-03 18:01:22,252 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 18:01:22,252 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-12-03 18:01:22,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 18:01:22,252 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:22,252 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1] [2018-12-03 18:01:22,252 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:22,254 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:22,254 INFO L82 PathProgramCache]: Analyzing trace with hash 801918334, now seen corresponding path program 5 times [2018-12-03 18:01:22,254 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:22,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:22,255 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:22,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:22,255 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:22,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:22,424 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:22,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:22,424 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:22,424 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:22,425 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:22,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:22,425 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:22,434 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:01:22,434 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:01:22,458 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 18:01:22,459 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:22,461 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:22,652 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:22,652 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:22,720 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:22,743 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:22,743 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-12-03 18:01:22,743 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:22,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 18:01:22,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 18:01:22,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=229, Unknown=0, NotChecked=0, Total=306 [2018-12-03 18:01:22,745 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 18 states. [2018-12-03 18:01:22,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:22,895 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2018-12-03 18:01:22,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 18:01:22,895 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 14 [2018-12-03 18:01:22,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:22,896 INFO L225 Difference]: With dead ends: 27 [2018-12-03 18:01:22,896 INFO L226 Difference]: Without dead ends: 16 [2018-12-03 18:01:22,897 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 12 SyntacticMatches, 7 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=119, Invalid=343, Unknown=0, NotChecked=0, Total=462 [2018-12-03 18:01:22,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-12-03 18:01:22,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-12-03 18:01:22,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-12-03 18:01:22,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-12-03 18:01:22,901 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2018-12-03 18:01:22,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:22,902 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-12-03 18:01:22,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 18:01:22,902 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-12-03 18:01:22,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-12-03 18:01:22,903 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:22,903 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1] [2018-12-03 18:01:22,903 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:22,903 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:22,904 INFO L82 PathProgramCache]: Analyzing trace with hash -460110731, now seen corresponding path program 6 times [2018-12-03 18:01:22,904 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:22,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:22,905 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:22,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:22,905 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:22,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:23,072 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:23,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:23,073 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:23,073 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:23,073 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:23,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:23,074 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:23,084 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:01:23,084 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:01:23,114 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:01:23,114 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:23,116 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:23,205 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:23,205 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:23,258 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:23,278 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:23,278 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 9 [2018-12-03 18:01:23,278 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:23,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 18:01:23,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 18:01:23,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-12-03 18:01:23,279 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 10 states. [2018-12-03 18:01:23,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:23,402 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2018-12-03 18:01:23,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 18:01:23,403 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 15 [2018-12-03 18:01:23,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:23,404 INFO L225 Difference]: With dead ends: 24 [2018-12-03 18:01:23,404 INFO L226 Difference]: Without dead ends: 22 [2018-12-03 18:01:23,405 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 8 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=131, Unknown=0, NotChecked=0, Total=210 [2018-12-03 18:01:23,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-03 18:01:23,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 18. [2018-12-03 18:01:23,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-12-03 18:01:23,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-12-03 18:01:23,410 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 15 [2018-12-03 18:01:23,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:23,410 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-12-03 18:01:23,411 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 18:01:23,411 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-12-03 18:01:23,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-12-03 18:01:23,411 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:23,412 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1] [2018-12-03 18:01:23,412 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:23,412 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:23,412 INFO L82 PathProgramCache]: Analyzing trace with hash 215271311, now seen corresponding path program 7 times [2018-12-03 18:01:23,412 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:23,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:23,414 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:23,414 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:23,414 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:23,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:23,546 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 20 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:23,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:23,547 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:23,547 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:23,547 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:23,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:23,547 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:23,557 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:23,557 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:01:23,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:23,574 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:23,914 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 20 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:23,914 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:23,997 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 20 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:24,017 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:24,017 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-12-03 18:01:24,017 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:24,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 18:01:24,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 18:01:24,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=351, Unknown=0, NotChecked=0, Total=462 [2018-12-03 18:01:24,019 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 22 states. [2018-12-03 18:01:24,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:24,557 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2018-12-03 18:01:24,557 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 18:01:24,558 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 17 [2018-12-03 18:01:24,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:24,558 INFO L225 Difference]: With dead ends: 32 [2018-12-03 18:01:24,558 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 18:01:24,559 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 14 SyntacticMatches, 9 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=171, Invalid=531, Unknown=0, NotChecked=0, Total=702 [2018-12-03 18:01:24,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 18:01:24,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-12-03 18:01:24,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 18:01:24,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-12-03 18:01:24,564 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2018-12-03 18:01:24,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:24,565 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-12-03 18:01:24,565 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 18:01:24,565 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-12-03 18:01:24,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 18:01:24,566 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:24,566 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1] [2018-12-03 18:01:24,566 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:24,566 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:24,567 INFO L82 PathProgramCache]: Analyzing trace with hash 1251105080, now seen corresponding path program 8 times [2018-12-03 18:01:24,567 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:24,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:24,568 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:24,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:24,568 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:24,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:24,718 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:24,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:24,719 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:24,719 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:24,719 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:24,720 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:24,720 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:24,730 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:01:24,731 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:01:24,822 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-12-03 18:01:24,822 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:24,825 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:24,982 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:24,983 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:25,406 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:25,427 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:25,427 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 10 [2018-12-03 18:01:25,427 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:25,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 18:01:25,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 18:01:25,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2018-12-03 18:01:25,428 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 11 states. [2018-12-03 18:01:25,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:25,573 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2018-12-03 18:01:25,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 18:01:25,576 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2018-12-03 18:01:25,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:25,577 INFO L225 Difference]: With dead ends: 27 [2018-12-03 18:01:25,577 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 18:01:25,578 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 28 SyntacticMatches, 10 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=102, Invalid=170, Unknown=0, NotChecked=0, Total=272 [2018-12-03 18:01:25,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 18:01:25,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 21. [2018-12-03 18:01:25,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 18:01:25,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-12-03 18:01:25,584 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2018-12-03 18:01:25,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:25,584 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-12-03 18:01:25,584 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 18:01:25,584 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-12-03 18:01:25,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 18:01:25,585 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:25,585 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1] [2018-12-03 18:01:25,585 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:25,585 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:25,586 INFO L82 PathProgramCache]: Analyzing trace with hash -278808686, now seen corresponding path program 9 times [2018-12-03 18:01:25,586 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:25,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:25,587 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:25,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:25,587 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:25,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:25,814 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:25,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:25,815 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:25,815 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:25,815 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:25,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:25,815 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:25,824 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:01:25,824 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:01:25,842 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:01:25,842 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:25,844 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:26,098 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:26,099 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:26,165 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:26,185 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:26,185 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-12-03 18:01:26,185 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:26,186 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 18:01:26,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 18:01:26,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=499, Unknown=0, NotChecked=0, Total=650 [2018-12-03 18:01:26,187 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 26 states. [2018-12-03 18:01:26,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:26,488 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2018-12-03 18:01:26,488 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 18:01:26,488 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 20 [2018-12-03 18:01:26,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:26,489 INFO L225 Difference]: With dead ends: 37 [2018-12-03 18:01:26,490 INFO L226 Difference]: Without dead ends: 22 [2018-12-03 18:01:26,491 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 16 SyntacticMatches, 11 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=232, Invalid=760, Unknown=0, NotChecked=0, Total=992 [2018-12-03 18:01:26,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-03 18:01:26,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-12-03 18:01:26,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-12-03 18:01:26,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-12-03 18:01:26,495 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 20 [2018-12-03 18:01:26,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:26,496 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-12-03 18:01:26,496 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 18:01:26,496 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-12-03 18:01:26,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 18:01:26,496 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:26,496 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1] [2018-12-03 18:01:26,497 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:26,497 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:26,497 INFO L82 PathProgramCache]: Analyzing trace with hash -1095018167, now seen corresponding path program 10 times [2018-12-03 18:01:26,497 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:26,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:26,498 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:26,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:26,498 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:26,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:26,609 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:26,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:26,610 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:26,611 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:26,611 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:26,611 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:26,611 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:26,621 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:26,621 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:01:26,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:26,640 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:26,678 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:26,680 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:26,767 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:26,787 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:26,787 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 11 [2018-12-03 18:01:26,787 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:26,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 18:01:26,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 18:01:26,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2018-12-03 18:01:26,789 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 12 states. [2018-12-03 18:01:26,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:26,913 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2018-12-03 18:01:26,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 18:01:26,913 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2018-12-03 18:01:26,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:26,914 INFO L225 Difference]: With dead ends: 30 [2018-12-03 18:01:26,914 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 18:01:26,915 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 33 SyntacticMatches, 12 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=128, Invalid=214, Unknown=0, NotChecked=0, Total=342 [2018-12-03 18:01:26,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 18:01:26,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 24. [2018-12-03 18:01:26,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-03 18:01:26,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-12-03 18:01:26,923 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2018-12-03 18:01:26,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:26,923 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-12-03 18:01:26,923 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 18:01:26,923 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-12-03 18:01:26,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 18:01:26,924 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:26,924 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1] [2018-12-03 18:01:26,924 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:26,924 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:26,924 INFO L82 PathProgramCache]: Analyzing trace with hash -45418653, now seen corresponding path program 11 times [2018-12-03 18:01:26,925 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:26,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:26,926 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:26,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:26,926 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:26,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:27,085 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:27,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:27,086 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:27,087 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:27,087 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:27,087 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:27,087 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:27,096 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:01:27,096 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:01:27,184 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-12-03 18:01:27,185 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:27,187 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:27,457 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:27,457 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:27,558 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:27,579 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:27,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2018-12-03 18:01:27,580 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:27,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-12-03 18:01:27,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-12-03 18:01:27,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=673, Unknown=0, NotChecked=0, Total=870 [2018-12-03 18:01:27,581 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 30 states. [2018-12-03 18:01:27,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:27,801 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2018-12-03 18:01:27,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 18:01:27,801 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 23 [2018-12-03 18:01:27,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:27,802 INFO L225 Difference]: With dead ends: 42 [2018-12-03 18:01:27,802 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 18:01:27,803 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 18 SyntacticMatches, 13 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 590 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=302, Invalid=1030, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 18:01:27,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 18:01:27,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-12-03 18:01:27,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 18:01:27,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-12-03 18:01:27,809 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 23 [2018-12-03 18:01:27,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:27,810 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2018-12-03 18:01:27,810 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-12-03 18:01:27,810 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2018-12-03 18:01:27,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 18:01:27,811 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:27,811 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1] [2018-12-03 18:01:27,811 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:27,811 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:27,812 INFO L82 PathProgramCache]: Analyzing trace with hash -1932204468, now seen corresponding path program 12 times [2018-12-03 18:01:27,812 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:27,813 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:27,813 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:27,813 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:27,813 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:27,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:27,959 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:27,960 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:27,960 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:27,960 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:27,960 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:27,960 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:27,960 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:27,971 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:01:27,971 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:01:27,990 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:01:27,991 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:27,994 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:28,057 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:28,058 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:28,167 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:28,186 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:28,187 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 12 [2018-12-03 18:01:28,187 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:28,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 18:01:28,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 18:01:28,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2018-12-03 18:01:28,188 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 13 states. [2018-12-03 18:01:28,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:28,449 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2018-12-03 18:01:28,449 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 18:01:28,449 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-12-03 18:01:28,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:28,451 INFO L225 Difference]: With dead ends: 33 [2018-12-03 18:01:28,451 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 18:01:28,452 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 38 SyntacticMatches, 14 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=157, Invalid=263, Unknown=0, NotChecked=0, Total=420 [2018-12-03 18:01:28,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 18:01:28,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 27. [2018-12-03 18:01:28,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 18:01:28,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-12-03 18:01:28,460 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2018-12-03 18:01:28,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:28,461 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-12-03 18:01:28,461 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 18:01:28,461 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-12-03 18:01:28,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 18:01:28,462 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:28,462 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1] [2018-12-03 18:01:28,462 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:28,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:28,463 INFO L82 PathProgramCache]: Analyzing trace with hash -1422569562, now seen corresponding path program 13 times [2018-12-03 18:01:28,463 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:28,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:28,464 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:28,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:28,464 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:28,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:28,667 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:28,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:28,668 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:28,668 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:28,669 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:28,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:28,669 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:28,679 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:28,679 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:01:28,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:28,716 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:29,097 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:29,097 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:29,422 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:29,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:29,442 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-12-03 18:01:29,442 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:29,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-12-03 18:01:29,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-12-03 18:01:29,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=873, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 18:01:29,443 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 34 states. [2018-12-03 18:01:29,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:29,780 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-12-03 18:01:29,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 18:01:29,780 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 26 [2018-12-03 18:01:29,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:29,781 INFO L225 Difference]: With dead ends: 47 [2018-12-03 18:01:29,781 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 18:01:29,782 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 20 SyntacticMatches, 15 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 786 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=381, Invalid=1341, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 18:01:29,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 18:01:29,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-12-03 18:01:29,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-03 18:01:29,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-12-03 18:01:29,788 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 26 [2018-12-03 18:01:29,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:29,788 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-12-03 18:01:29,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-12-03 18:01:29,788 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-12-03 18:01:29,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-03 18:01:29,789 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:29,789 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1] [2018-12-03 18:01:29,790 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:29,790 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:29,790 INFO L82 PathProgramCache]: Analyzing trace with hash 1873185821, now seen corresponding path program 14 times [2018-12-03 18:01:29,790 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:29,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:29,791 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:29,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:29,791 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:29,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:30,654 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:30,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:30,655 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:30,655 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:30,656 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:30,656 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:30,656 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:30,665 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:01:30,666 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:01:30,738 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-12-03 18:01:30,739 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:30,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:30,779 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:30,779 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:30,883 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:30,903 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:30,903 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 13 [2018-12-03 18:01:30,904 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:30,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 18:01:30,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 18:01:30,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:01:30,905 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 14 states. [2018-12-03 18:01:31,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:31,133 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2018-12-03 18:01:31,134 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 18:01:31,134 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2018-12-03 18:01:31,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:31,135 INFO L225 Difference]: With dead ends: 36 [2018-12-03 18:01:31,135 INFO L226 Difference]: Without dead ends: 34 [2018-12-03 18:01:31,136 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 43 SyntacticMatches, 16 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=189, Invalid=317, Unknown=0, NotChecked=0, Total=506 [2018-12-03 18:01:31,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-12-03 18:01:31,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2018-12-03 18:01:31,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-03 18:01:31,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-12-03 18:01:31,143 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 27 [2018-12-03 18:01:31,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:31,143 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-12-03 18:01:31,143 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 18:01:31,143 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-12-03 18:01:31,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-12-03 18:01:31,144 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:31,144 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1] [2018-12-03 18:01:31,144 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:31,144 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:31,145 INFO L82 PathProgramCache]: Analyzing trace with hash 540329271, now seen corresponding path program 15 times [2018-12-03 18:01:31,145 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:31,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:31,146 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:31,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:31,146 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:31,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:31,530 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 72 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:31,531 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:31,531 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:31,531 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:31,532 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:31,532 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:31,532 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:31,543 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:01:31,543 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:01:31,567 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:01:31,568 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:31,572 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:32,051 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 72 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:32,052 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:32,164 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 72 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:32,185 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:32,185 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-12-03 18:01:32,185 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:32,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 18:01:32,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 18:01:32,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=1099, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 18:01:32,187 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 38 states. [2018-12-03 18:01:32,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:32,607 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2018-12-03 18:01:32,607 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 18:01:32,607 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 29 [2018-12-03 18:01:32,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:32,608 INFO L225 Difference]: With dead ends: 52 [2018-12-03 18:01:32,608 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 18:01:32,610 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 22 SyntacticMatches, 17 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1010 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=469, Invalid=1693, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 18:01:32,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 18:01:32,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-12-03 18:01:32,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 18:01:32,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-12-03 18:01:32,616 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 29 [2018-12-03 18:01:32,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:32,617 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-12-03 18:01:32,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 18:01:32,617 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-12-03 18:01:32,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 18:01:32,618 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:32,618 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1] [2018-12-03 18:01:32,618 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:32,618 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:32,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1436557664, now seen corresponding path program 16 times [2018-12-03 18:01:32,619 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:32,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:32,620 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:32,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:32,620 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:32,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:33,169 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:33,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:33,170 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:33,170 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:33,170 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:33,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:33,170 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:33,180 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:33,180 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:01:33,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:33,206 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:33,299 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:33,299 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:33,519 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:33,541 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:33,542 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 14 [2018-12-03 18:01:33,542 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:33,542 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 18:01:33,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 18:01:33,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=127, Unknown=0, NotChecked=0, Total=210 [2018-12-03 18:01:33,543 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 15 states. [2018-12-03 18:01:33,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:33,734 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-12-03 18:01:33,735 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 18:01:33,735 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 30 [2018-12-03 18:01:33,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:33,736 INFO L225 Difference]: With dead ends: 39 [2018-12-03 18:01:33,736 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 18:01:33,737 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 48 SyntacticMatches, 18 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=224, Invalid=376, Unknown=0, NotChecked=0, Total=600 [2018-12-03 18:01:33,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 18:01:33,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33. [2018-12-03 18:01:33,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-03 18:01:33,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-12-03 18:01:33,745 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2018-12-03 18:01:33,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:33,745 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-12-03 18:01:33,745 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 18:01:33,745 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-12-03 18:01:33,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 18:01:33,746 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:33,746 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1] [2018-12-03 18:01:33,747 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:33,747 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:33,747 INFO L82 PathProgramCache]: Analyzing trace with hash 1847465402, now seen corresponding path program 17 times [2018-12-03 18:01:33,747 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:33,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:33,748 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:33,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:33,748 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:33,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:35,060 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 90 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:35,060 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:35,060 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:35,060 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:35,061 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:35,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:35,061 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:35,070 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:01:35,070 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:01:35,116 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-12-03 18:01:35,117 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:35,119 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:35,473 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 90 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:35,473 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:36,081 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 90 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:36,101 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:36,101 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2018-12-03 18:01:36,102 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:36,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-12-03 18:01:36,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-12-03 18:01:36,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=1351, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 18:01:36,103 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 42 states. [2018-12-03 18:01:36,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:36,631 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-12-03 18:01:36,631 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-03 18:01:36,632 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 32 [2018-12-03 18:01:36,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:36,632 INFO L225 Difference]: With dead ends: 57 [2018-12-03 18:01:36,633 INFO L226 Difference]: Without dead ends: 34 [2018-12-03 18:01:36,634 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 24 SyntacticMatches, 19 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1262 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=566, Invalid=2086, Unknown=0, NotChecked=0, Total=2652 [2018-12-03 18:01:36,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-12-03 18:01:36,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-12-03 18:01:36,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-12-03 18:01:36,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2018-12-03 18:01:36,640 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 32 [2018-12-03 18:01:36,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:36,641 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2018-12-03 18:01:36,641 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-12-03 18:01:36,641 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2018-12-03 18:01:36,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-12-03 18:01:36,642 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:36,642 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1] [2018-12-03 18:01:36,642 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:36,642 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:36,642 INFO L82 PathProgramCache]: Analyzing trace with hash -424157967, now seen corresponding path program 18 times [2018-12-03 18:01:36,642 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:36,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:36,643 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:36,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:36,643 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:36,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:36,844 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:36,844 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:36,844 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:36,844 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:36,845 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:36,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:36,845 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:36,854 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:01:36,855 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:01:36,881 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:01:36,881 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:36,884 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:36,920 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:36,920 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:37,020 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:37,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:37,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 15 [2018-12-03 18:01:37,040 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:37,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 18:01:37,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 18:01:37,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=144, Unknown=0, NotChecked=0, Total=240 [2018-12-03 18:01:37,041 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 16 states. [2018-12-03 18:01:37,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:37,224 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2018-12-03 18:01:37,224 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 18:01:37,224 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2018-12-03 18:01:37,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:37,225 INFO L225 Difference]: With dead ends: 42 [2018-12-03 18:01:37,225 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 18:01:37,226 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 53 SyntacticMatches, 20 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=262, Invalid=440, Unknown=0, NotChecked=0, Total=702 [2018-12-03 18:01:37,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 18:01:37,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 36. [2018-12-03 18:01:37,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-12-03 18:01:37,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-12-03 18:01:37,234 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 33 [2018-12-03 18:01:37,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:37,234 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-12-03 18:01:37,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 18:01:37,234 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-12-03 18:01:37,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-12-03 18:01:37,235 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:37,235 INFO L402 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1] [2018-12-03 18:01:37,235 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:37,235 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:37,235 INFO L82 PathProgramCache]: Analyzing trace with hash 406139147, now seen corresponding path program 19 times [2018-12-03 18:01:37,236 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:37,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:37,236 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:37,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:37,237 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:37,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:38,299 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 110 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:38,299 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:38,300 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:38,300 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:38,300 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:38,300 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:38,300 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:38,309 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:38,309 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:01:38,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:38,340 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:38,788 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 110 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:38,788 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:38,967 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 110 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:38,988 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:38,988 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-12-03 18:01:38,988 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:38,989 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-12-03 18:01:38,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-12-03 18:01:38,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=1629, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 18:01:38,990 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 46 states. [2018-12-03 18:01:39,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:39,740 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2018-12-03 18:01:39,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 18:01:39,740 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 35 [2018-12-03 18:01:39,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:39,741 INFO L225 Difference]: With dead ends: 62 [2018-12-03 18:01:39,741 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 18:01:39,743 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 26 SyntacticMatches, 21 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1542 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=672, Invalid=2520, Unknown=0, NotChecked=0, Total=3192 [2018-12-03 18:01:39,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 18:01:39,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-12-03 18:01:39,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 18:01:39,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-12-03 18:01:39,751 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 35 [2018-12-03 18:01:39,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:39,751 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2018-12-03 18:01:39,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-12-03 18:01:39,752 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2018-12-03 18:01:39,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-12-03 18:01:39,752 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:39,752 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1] [2018-12-03 18:01:39,753 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:39,753 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:39,753 INFO L82 PathProgramCache]: Analyzing trace with hash -2020930956, now seen corresponding path program 20 times [2018-12-03 18:01:39,753 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:39,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:39,754 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:39,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:39,755 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:39,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:40,190 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:40,190 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:40,190 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:40,191 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:40,191 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:40,191 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:40,191 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:40,200 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:01:40,200 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:01:40,239 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-12-03 18:01:40,239 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:40,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:40,272 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:40,272 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:40,882 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:40,916 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:40,917 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 16 [2018-12-03 18:01:40,917 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:40,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 18:01:40,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 18:01:40,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=162, Unknown=0, NotChecked=0, Total=272 [2018-12-03 18:01:40,918 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 17 states. [2018-12-03 18:01:41,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:41,221 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2018-12-03 18:01:41,224 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 18:01:41,224 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 36 [2018-12-03 18:01:41,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:41,225 INFO L225 Difference]: With dead ends: 45 [2018-12-03 18:01:41,225 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 18:01:41,226 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 58 SyntacticMatches, 22 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=303, Invalid=509, Unknown=0, NotChecked=0, Total=812 [2018-12-03 18:01:41,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 18:01:41,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 39. [2018-12-03 18:01:41,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 18:01:41,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-12-03 18:01:41,237 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2018-12-03 18:01:41,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:41,238 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-12-03 18:01:41,238 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 18:01:41,238 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-12-03 18:01:41,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 18:01:41,238 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:41,238 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1] [2018-12-03 18:01:41,239 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:41,239 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:41,239 INFO L82 PathProgramCache]: Analyzing trace with hash -789378610, now seen corresponding path program 21 times [2018-12-03 18:01:41,239 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:41,243 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:41,243 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:41,243 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:41,243 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:41,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:41,589 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 132 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:41,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:41,589 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:41,589 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:41,589 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:41,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:41,590 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:41,600 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:01:41,600 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:01:41,631 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:01:41,632 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:41,635 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:42,156 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 132 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:42,156 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:42,352 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 132 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:42,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:42,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-12-03 18:01:42,371 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:42,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 18:01:42,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 18:01:42,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=517, Invalid=1933, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:01:42,373 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 50 states. [2018-12-03 18:01:42,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:42,938 INFO L93 Difference]: Finished difference Result 67 states and 69 transitions. [2018-12-03 18:01:42,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 18:01:42,938 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 38 [2018-12-03 18:01:42,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:42,939 INFO L225 Difference]: With dead ends: 67 [2018-12-03 18:01:42,939 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 18:01:42,940 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 28 SyntacticMatches, 23 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1850 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=787, Invalid=2995, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 18:01:42,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 18:01:42,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-12-03 18:01:42,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-12-03 18:01:42,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2018-12-03 18:01:42,949 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 38 [2018-12-03 18:01:42,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:42,949 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2018-12-03 18:01:42,949 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 18:01:42,950 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2018-12-03 18:01:42,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-12-03 18:01:42,950 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:42,950 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1] [2018-12-03 18:01:42,950 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:42,951 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:42,951 INFO L82 PathProgramCache]: Analyzing trace with hash 139611077, now seen corresponding path program 22 times [2018-12-03 18:01:42,951 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:42,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:42,952 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:42,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:42,952 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:42,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:43,403 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:43,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:43,403 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:43,403 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:43,404 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:43,404 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:43,404 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:43,414 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:43,414 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:01:43,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:43,448 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:43,489 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:43,489 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:43,672 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:43,692 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:43,693 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 17 [2018-12-03 18:01:43,693 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:43,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 18:01:43,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 18:01:43,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=181, Unknown=0, NotChecked=0, Total=306 [2018-12-03 18:01:43,694 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 18 states. [2018-12-03 18:01:43,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:43,950 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2018-12-03 18:01:43,950 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 18:01:43,950 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 39 [2018-12-03 18:01:43,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:43,951 INFO L225 Difference]: With dead ends: 48 [2018-12-03 18:01:43,951 INFO L226 Difference]: Without dead ends: 46 [2018-12-03 18:01:43,952 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 63 SyntacticMatches, 24 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=347, Invalid=583, Unknown=0, NotChecked=0, Total=930 [2018-12-03 18:01:43,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-12-03 18:01:43,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2018-12-03 18:01:43,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-03 18:01:43,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-12-03 18:01:43,962 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 39 [2018-12-03 18:01:43,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:43,963 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-12-03 18:01:43,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 18:01:43,963 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-12-03 18:01:43,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-12-03 18:01:43,963 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:43,964 INFO L402 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1] [2018-12-03 18:01:43,964 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:43,964 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:43,964 INFO L82 PathProgramCache]: Analyzing trace with hash 1022311135, now seen corresponding path program 23 times [2018-12-03 18:01:43,964 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:43,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:43,965 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:43,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:43,965 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:43,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:44,402 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 156 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:44,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:44,403 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:44,403 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:44,403 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:44,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:44,403 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:44,412 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:01:44,412 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:01:44,455 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-12-03 18:01:44,455 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:44,457 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:45,137 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 156 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:45,138 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:45,389 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 156 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:45,409 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:45,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2018-12-03 18:01:45,410 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:45,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-12-03 18:01:45,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-12-03 18:01:45,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=599, Invalid=2263, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 18:01:45,412 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 54 states. [2018-12-03 18:01:45,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:45,892 INFO L93 Difference]: Finished difference Result 72 states and 74 transitions. [2018-12-03 18:01:45,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-03 18:01:45,892 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 41 [2018-12-03 18:01:45,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:45,892 INFO L225 Difference]: With dead ends: 72 [2018-12-03 18:01:45,893 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 18:01:45,894 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 30 SyntacticMatches, 25 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2186 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=911, Invalid=3511, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 18:01:45,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 18:01:45,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-12-03 18:01:45,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-12-03 18:01:45,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-12-03 18:01:45,902 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 41 [2018-12-03 18:01:45,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:45,902 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-12-03 18:01:45,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-12-03 18:01:45,902 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-12-03 18:01:45,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 18:01:45,903 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:45,903 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1] [2018-12-03 18:01:45,903 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:45,903 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:45,903 INFO L82 PathProgramCache]: Analyzing trace with hash -215178872, now seen corresponding path program 24 times [2018-12-03 18:01:45,904 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:45,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:45,904 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:45,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:45,905 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:45,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:46,213 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:46,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:46,213 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:46,213 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:46,214 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:46,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:46,214 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:46,222 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:01:46,223 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:01:46,253 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:01:46,253 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:46,256 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:46,348 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:46,348 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:46,580 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:46,599 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:46,599 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 18 [2018-12-03 18:01:46,599 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:46,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 18:01:46,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 18:01:46,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=201, Unknown=0, NotChecked=0, Total=342 [2018-12-03 18:01:46,600 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 19 states. [2018-12-03 18:01:46,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:46,853 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2018-12-03 18:01:46,853 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 18:01:46,853 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2018-12-03 18:01:46,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:46,854 INFO L225 Difference]: With dead ends: 51 [2018-12-03 18:01:46,854 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 18:01:46,855 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 68 SyntacticMatches, 26 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=394, Invalid=662, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 18:01:46,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 18:01:46,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 45. [2018-12-03 18:01:46,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 18:01:46,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-12-03 18:01:46,864 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2018-12-03 18:01:46,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:46,865 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-12-03 18:01:46,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 18:01:46,865 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-12-03 18:01:46,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 18:01:46,865 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:46,866 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1] [2018-12-03 18:01:46,866 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:46,866 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:46,866 INFO L82 PathProgramCache]: Analyzing trace with hash -628413470, now seen corresponding path program 25 times [2018-12-03 18:01:46,866 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:46,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:46,867 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:46,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:46,867 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:46,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:47,254 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 182 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:47,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:47,254 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:47,255 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:47,255 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:47,255 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:47,255 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:47,264 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:47,264 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:01:47,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:47,301 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:47,968 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 182 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:47,968 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:48,262 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 182 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:48,281 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:48,281 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-12-03 18:01:48,281 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:48,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-12-03 18:01:48,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-12-03 18:01:48,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=687, Invalid=2619, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 18:01:48,284 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 58 states. [2018-12-03 18:01:48,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:48,848 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2018-12-03 18:01:48,849 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-03 18:01:48,849 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 44 [2018-12-03 18:01:48,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:48,850 INFO L225 Difference]: With dead ends: 77 [2018-12-03 18:01:48,850 INFO L226 Difference]: Without dead ends: 46 [2018-12-03 18:01:48,852 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 32 SyntacticMatches, 27 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2550 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1044, Invalid=4068, Unknown=0, NotChecked=0, Total=5112 [2018-12-03 18:01:48,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-12-03 18:01:48,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-12-03 18:01:48,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-12-03 18:01:48,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-12-03 18:01:48,859 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 44 [2018-12-03 18:01:48,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:48,859 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-12-03 18:01:48,859 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-12-03 18:01:48,859 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-12-03 18:01:48,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-12-03 18:01:48,859 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:48,859 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1] [2018-12-03 18:01:48,860 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:48,860 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:48,860 INFO L82 PathProgramCache]: Analyzing trace with hash 1306056857, now seen corresponding path program 26 times [2018-12-03 18:01:48,860 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:48,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:48,861 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:48,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:48,861 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:48,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:49,218 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:49,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:49,219 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:49,219 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:49,219 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:49,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:49,219 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:49,229 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:01:49,229 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:01:49,269 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-12-03 18:01:49,269 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:49,272 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:49,298 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:49,299 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:49,628 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:49,648 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:49,649 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 19 [2018-12-03 18:01:49,649 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:49,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 18:01:49,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 18:01:49,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=222, Unknown=0, NotChecked=0, Total=380 [2018-12-03 18:01:49,650 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 20 states. [2018-12-03 18:01:49,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:49,982 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2018-12-03 18:01:49,982 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 18:01:49,982 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2018-12-03 18:01:49,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:49,983 INFO L225 Difference]: With dead ends: 54 [2018-12-03 18:01:49,983 INFO L226 Difference]: Without dead ends: 52 [2018-12-03 18:01:49,984 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 73 SyntacticMatches, 28 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=444, Invalid=746, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 18:01:49,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-03 18:01:49,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 48. [2018-12-03 18:01:49,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-03 18:01:49,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-12-03 18:01:49,993 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 45 [2018-12-03 18:01:49,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:49,993 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-12-03 18:01:49,993 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 18:01:49,994 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-12-03 18:01:49,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-12-03 18:01:49,994 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:49,994 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1] [2018-12-03 18:01:49,994 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:49,994 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:49,994 INFO L82 PathProgramCache]: Analyzing trace with hash 990241459, now seen corresponding path program 27 times [2018-12-03 18:01:49,995 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:49,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:49,995 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:49,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:49,995 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:50,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:50,533 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 210 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:50,533 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:50,534 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:50,534 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:50,534 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:50,534 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:50,534 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:50,544 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:01:50,544 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:01:50,580 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:01:50,580 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:50,583 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:51,313 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 210 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:51,313 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:51,684 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 210 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:51,703 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:51,703 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-12-03 18:01:51,703 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:51,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-12-03 18:01:51,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-12-03 18:01:51,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=781, Invalid=3001, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 18:01:51,705 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 62 states. [2018-12-03 18:01:52,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:52,824 INFO L93 Difference]: Finished difference Result 82 states and 84 transitions. [2018-12-03 18:01:52,824 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-03 18:01:52,824 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 47 [2018-12-03 18:01:52,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:52,824 INFO L225 Difference]: With dead ends: 82 [2018-12-03 18:01:52,825 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 18:01:52,827 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 34 SyntacticMatches, 29 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2942 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1186, Invalid=4666, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 18:01:52,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 18:01:52,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-12-03 18:01:52,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 18:01:52,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-12-03 18:01:52,833 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 47 [2018-12-03 18:01:52,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:52,834 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-12-03 18:01:52,834 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-12-03 18:01:52,834 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-12-03 18:01:52,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 18:01:52,834 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:52,834 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1] [2018-12-03 18:01:52,835 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:52,835 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:52,835 INFO L82 PathProgramCache]: Analyzing trace with hash 924575388, now seen corresponding path program 28 times [2018-12-03 18:01:52,835 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:52,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:52,836 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:52,836 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:52,836 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:52,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:53,054 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:53,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:53,055 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:53,055 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:53,055 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:53,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:53,055 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:53,065 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:53,065 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:01:53,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:53,105 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:53,131 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:53,131 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:53,341 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:53,359 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:53,360 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 20 [2018-12-03 18:01:53,360 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:53,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 18:01:53,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 18:01:53,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=244, Unknown=0, NotChecked=0, Total=420 [2018-12-03 18:01:53,361 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 21 states. [2018-12-03 18:01:53,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:53,624 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2018-12-03 18:01:53,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 18:01:53,625 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 48 [2018-12-03 18:01:53,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:53,626 INFO L225 Difference]: With dead ends: 57 [2018-12-03 18:01:53,626 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 18:01:53,627 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 78 SyntacticMatches, 30 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 527 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=497, Invalid=835, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 18:01:53,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 18:01:53,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2018-12-03 18:01:53,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 18:01:53,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-12-03 18:01:53,635 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2018-12-03 18:01:53,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:53,636 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-12-03 18:01:53,636 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 18:01:53,636 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-12-03 18:01:53,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 18:01:53,636 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:53,636 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1] [2018-12-03 18:01:53,636 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:53,637 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:53,637 INFO L82 PathProgramCache]: Analyzing trace with hash -541230090, now seen corresponding path program 29 times [2018-12-03 18:01:53,637 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:53,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:53,637 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:53,638 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:53,638 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:53,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:54,280 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 240 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:54,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:54,281 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:54,281 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:54,281 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:54,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:54,281 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:54,290 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:01:54,291 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:01:54,342 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-12-03 18:01:54,342 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:54,344 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:55,396 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 240 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:55,397 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:55,726 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 240 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:55,744 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:55,745 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2018-12-03 18:01:55,745 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:55,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-12-03 18:01:55,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-12-03 18:01:55,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=881, Invalid=3409, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 18:01:55,747 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 66 states. [2018-12-03 18:01:56,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:56,216 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2018-12-03 18:01:56,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-12-03 18:01:56,216 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 50 [2018-12-03 18:01:56,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:56,217 INFO L225 Difference]: With dead ends: 87 [2018-12-03 18:01:56,217 INFO L226 Difference]: Without dead ends: 52 [2018-12-03 18:01:56,218 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 36 SyntacticMatches, 31 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3362 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1337, Invalid=5305, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 18:01:56,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-03 18:01:56,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-12-03 18:01:56,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-12-03 18:01:56,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2018-12-03 18:01:56,225 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 50 [2018-12-03 18:01:56,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:56,225 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2018-12-03 18:01:56,225 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-12-03 18:01:56,225 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2018-12-03 18:01:56,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-12-03 18:01:56,225 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:56,226 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1] [2018-12-03 18:01:56,226 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:56,226 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:56,226 INFO L82 PathProgramCache]: Analyzing trace with hash 1705935725, now seen corresponding path program 30 times [2018-12-03 18:01:56,226 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:56,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:56,227 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:56,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:56,227 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:56,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:56,600 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:56,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:56,601 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:56,601 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:56,601 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:56,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:56,601 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:56,610 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:01:56,611 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:01:56,672 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:01:56,672 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:01:56,675 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:56,747 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:56,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:56,990 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:57,009 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:57,009 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 21 [2018-12-03 18:01:57,009 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:57,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 18:01:57,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 18:01:57,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=267, Unknown=0, NotChecked=0, Total=462 [2018-12-03 18:01:57,011 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand 22 states. [2018-12-03 18:01:57,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:01:57,333 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2018-12-03 18:01:57,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 18:01:57,334 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2018-12-03 18:01:57,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:01:57,335 INFO L225 Difference]: With dead ends: 60 [2018-12-03 18:01:57,335 INFO L226 Difference]: Without dead ends: 58 [2018-12-03 18:01:57,336 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 83 SyntacticMatches, 32 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=553, Invalid=929, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 18:01:57,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-03 18:01:57,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 54. [2018-12-03 18:01:57,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-12-03 18:01:57,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-12-03 18:01:57,349 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 51 [2018-12-03 18:01:57,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:01:57,349 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-12-03 18:01:57,349 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 18:01:57,350 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-12-03 18:01:57,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-12-03 18:01:57,350 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:01:57,350 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1] [2018-12-03 18:01:57,351 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:01:57,351 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:01:57,351 INFO L82 PathProgramCache]: Analyzing trace with hash -1273223033, now seen corresponding path program 31 times [2018-12-03 18:01:57,351 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:01:57,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:57,352 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:01:57,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:01:57,352 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:01:57,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:58,047 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 272 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:58,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:58,047 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:01:58,047 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:01:58,048 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:01:58,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:01:58,048 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:01:58,057 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:01:58,057 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:01:58,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:01:58,096 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:01:59,062 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 272 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:59,062 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:01:59,419 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 272 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:01:59,439 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:01:59,439 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-12-03 18:01:59,439 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:01:59,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-12-03 18:01:59,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-12-03 18:01:59,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=987, Invalid=3843, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 18:01:59,441 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 70 states. [2018-12-03 18:02:00,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:00,591 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2018-12-03 18:02:00,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-12-03 18:02:00,591 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 53 [2018-12-03 18:02:00,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:00,592 INFO L225 Difference]: With dead ends: 92 [2018-12-03 18:02:00,592 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 18:02:00,593 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 38 SyntacticMatches, 33 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3810 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1497, Invalid=5985, Unknown=0, NotChecked=0, Total=7482 [2018-12-03 18:02:00,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 18:02:00,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-12-03 18:02:00,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-03 18:02:00,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2018-12-03 18:02:00,601 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 53 [2018-12-03 18:02:00,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:00,601 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2018-12-03 18:02:00,601 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-12-03 18:02:00,601 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2018-12-03 18:02:00,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 18:02:00,601 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:00,602 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1] [2018-12-03 18:02:00,602 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:00,602 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:00,602 INFO L82 PathProgramCache]: Analyzing trace with hash -1611671120, now seen corresponding path program 32 times [2018-12-03 18:02:00,602 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:00,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:00,603 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:00,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:00,603 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:00,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:01,223 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:01,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:01,224 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:01,224 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:01,224 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:01,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:01,224 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:01,232 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:02:01,233 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:02:01,283 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-12-03 18:02:01,283 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:01,285 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:01,350 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:01,350 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:01,601 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:01,620 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:01,620 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 22 [2018-12-03 18:02:01,620 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:01,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 18:02:01,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 18:02:01,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=291, Unknown=0, NotChecked=0, Total=506 [2018-12-03 18:02:01,621 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 23 states. [2018-12-03 18:02:01,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:01,942 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-12-03 18:02:01,942 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 18:02:01,942 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 54 [2018-12-03 18:02:01,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:01,943 INFO L225 Difference]: With dead ends: 63 [2018-12-03 18:02:01,943 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 18:02:01,944 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 88 SyntacticMatches, 34 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 665 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=612, Invalid=1028, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 18:02:01,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 18:02:01,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 57. [2018-12-03 18:02:01,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-03 18:02:01,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-12-03 18:02:01,954 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2018-12-03 18:02:01,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:01,954 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-12-03 18:02:01,954 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 18:02:01,954 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-12-03 18:02:01,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-12-03 18:02:01,954 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:01,955 INFO L402 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1] [2018-12-03 18:02:01,955 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:01,955 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:01,955 INFO L82 PathProgramCache]: Analyzing trace with hash 1667299850, now seen corresponding path program 33 times [2018-12-03 18:02:01,955 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:01,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:01,956 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:01,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:01,956 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:01,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:02,529 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 306 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:02,530 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:02,530 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:02,530 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:02,530 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:02,530 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:02,530 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:02,538 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:02:02,538 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:02:02,578 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:02:02,579 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:02,582 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:03,622 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 306 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:03,622 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:04,314 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 306 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:04,333 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:04,333 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-12-03 18:02:04,333 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:04,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-03 18:02:04,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-03 18:02:04,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1099, Invalid=4303, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 18:02:04,334 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 74 states. [2018-12-03 18:02:05,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:05,039 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2018-12-03 18:02:05,039 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-12-03 18:02:05,039 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 56 [2018-12-03 18:02:05,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:05,039 INFO L225 Difference]: With dead ends: 97 [2018-12-03 18:02:05,039 INFO L226 Difference]: Without dead ends: 58 [2018-12-03 18:02:05,041 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 40 SyntacticMatches, 35 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4286 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1666, Invalid=6706, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 18:02:05,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-03 18:02:05,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-12-03 18:02:05,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-12-03 18:02:05,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2018-12-03 18:02:05,052 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 56 [2018-12-03 18:02:05,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:05,053 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2018-12-03 18:02:05,053 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-03 18:02:05,053 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2018-12-03 18:02:05,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-12-03 18:02:05,053 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:05,054 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1] [2018-12-03 18:02:05,054 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:05,054 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:05,054 INFO L82 PathProgramCache]: Analyzing trace with hash -751416255, now seen corresponding path program 34 times [2018-12-03 18:02:05,054 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:05,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:05,055 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:05,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:05,055 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:05,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:05,389 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:05,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:05,389 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:05,390 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:05,390 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:05,390 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:05,390 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:05,398 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:05,398 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:02:05,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:05,443 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:05,489 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:05,489 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:05,768 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:05,787 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:05,787 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 23 [2018-12-03 18:02:05,787 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:05,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 18:02:05,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 18:02:05,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2018-12-03 18:02:05,788 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 24 states. [2018-12-03 18:02:06,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:06,124 INFO L93 Difference]: Finished difference Result 66 states and 67 transitions. [2018-12-03 18:02:06,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 18:02:06,124 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 57 [2018-12-03 18:02:06,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:06,125 INFO L225 Difference]: With dead ends: 66 [2018-12-03 18:02:06,125 INFO L226 Difference]: Without dead ends: 64 [2018-12-03 18:02:06,125 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 93 SyntacticMatches, 36 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 740 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=674, Invalid=1132, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 18:02:06,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-12-03 18:02:06,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 60. [2018-12-03 18:02:06,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-12-03 18:02:06,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-12-03 18:02:06,136 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 57 [2018-12-03 18:02:06,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:06,136 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-12-03 18:02:06,136 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 18:02:06,136 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-12-03 18:02:06,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-12-03 18:02:06,137 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:06,137 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1] [2018-12-03 18:02:06,137 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:06,137 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:06,137 INFO L82 PathProgramCache]: Analyzing trace with hash -556463013, now seen corresponding path program 35 times [2018-12-03 18:02:06,137 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:06,138 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:06,138 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:06,138 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:06,138 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:06,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:06,723 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 342 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:06,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:06,724 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:06,724 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:06,724 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:06,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:06,724 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:06,734 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:02:06,734 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:02:06,792 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-12-03 18:02:06,792 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:06,795 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:07,913 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 342 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:07,913 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:08,972 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 342 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:08,991 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:08,991 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2018-12-03 18:02:08,991 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:08,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-12-03 18:02:08,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-12-03 18:02:08,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1217, Invalid=4789, Unknown=0, NotChecked=0, Total=6006 [2018-12-03 18:02:08,993 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 78 states. [2018-12-03 18:02:10,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:10,588 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2018-12-03 18:02:10,589 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-12-03 18:02:10,589 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 59 [2018-12-03 18:02:10,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:10,589 INFO L225 Difference]: With dead ends: 102 [2018-12-03 18:02:10,589 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 18:02:10,590 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 42 SyntacticMatches, 37 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4790 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1844, Invalid=7468, Unknown=0, NotChecked=0, Total=9312 [2018-12-03 18:02:10,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 18:02:10,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-12-03 18:02:10,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-12-03 18:02:10,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2018-12-03 18:02:10,602 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 59 [2018-12-03 18:02:10,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:10,602 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2018-12-03 18:02:10,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-12-03 18:02:10,602 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2018-12-03 18:02:10,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-12-03 18:02:10,603 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:10,603 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1] [2018-12-03 18:02:10,603 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:10,603 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:10,603 INFO L82 PathProgramCache]: Analyzing trace with hash 138377924, now seen corresponding path program 36 times [2018-12-03 18:02:10,603 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:10,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:10,604 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:10,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:10,604 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:10,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:10,920 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:10,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:10,921 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:10,921 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:10,921 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:10,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:10,921 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:10,929 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:02:10,929 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:02:10,972 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:02:10,972 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:10,975 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:11,161 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:11,162 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:11,455 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:11,474 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:11,474 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 24 [2018-12-03 18:02:11,474 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:11,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-03 18:02:11,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-03 18:02:11,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=342, Unknown=0, NotChecked=0, Total=600 [2018-12-03 18:02:11,475 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 25 states. [2018-12-03 18:02:11,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:11,837 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-12-03 18:02:11,837 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 18:02:11,837 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 60 [2018-12-03 18:02:11,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:11,838 INFO L225 Difference]: With dead ends: 69 [2018-12-03 18:02:11,838 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 18:02:11,839 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 98 SyntacticMatches, 38 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 819 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=739, Invalid=1241, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 18:02:11,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 18:02:11,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 63. [2018-12-03 18:02:11,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 18:02:11,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-12-03 18:02:11,854 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 60 [2018-12-03 18:02:11,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:11,854 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-12-03 18:02:11,854 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-03 18:02:11,854 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-12-03 18:02:11,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 18:02:11,855 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:11,855 INFO L402 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1] [2018-12-03 18:02:11,855 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:11,855 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:11,855 INFO L82 PathProgramCache]: Analyzing trace with hash -162748898, now seen corresponding path program 37 times [2018-12-03 18:02:11,855 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:11,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:11,856 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:11,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:11,856 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:11,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:12,510 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 380 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:12,510 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:12,510 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:12,510 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:12,511 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:12,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:12,511 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:12,519 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:12,520 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:02:12,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:12,570 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:13,734 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 380 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:13,734 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:14,232 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 380 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:14,251 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:14,252 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-12-03 18:02:14,252 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:14,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 82 states [2018-12-03 18:02:14,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2018-12-03 18:02:14,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1341, Invalid=5301, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 18:02:14,253 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 82 states. [2018-12-03 18:02:14,675 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-12-03 18:02:15,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:15,917 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2018-12-03 18:02:15,917 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-12-03 18:02:15,918 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 62 [2018-12-03 18:02:15,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:15,918 INFO L225 Difference]: With dead ends: 107 [2018-12-03 18:02:15,918 INFO L226 Difference]: Without dead ends: 64 [2018-12-03 18:02:15,919 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 44 SyntacticMatches, 39 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5322 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2031, Invalid=8271, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 18:02:15,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-12-03 18:02:15,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2018-12-03 18:02:15,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-12-03 18:02:15,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2018-12-03 18:02:15,930 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 62 [2018-12-03 18:02:15,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:15,930 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2018-12-03 18:02:15,930 INFO L481 AbstractCegarLoop]: Interpolant automaton has 82 states. [2018-12-03 18:02:15,930 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2018-12-03 18:02:15,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-12-03 18:02:15,930 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:15,930 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1] [2018-12-03 18:02:15,931 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:15,931 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:15,931 INFO L82 PathProgramCache]: Analyzing trace with hash -1898761451, now seen corresponding path program 38 times [2018-12-03 18:02:15,931 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:15,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:15,931 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:15,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:15,932 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:15,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:16,429 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 210 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:16,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:16,430 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:16,430 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:16,430 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:16,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:16,430 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:16,447 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:02:16,447 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:02:16,512 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-12-03 18:02:16,512 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:16,515 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:16,544 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 210 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:16,544 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:17,014 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 210 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:17,032 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:17,033 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 25 [2018-12-03 18:02:17,033 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:17,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 18:02:17,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 18:02:17,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=369, Unknown=0, NotChecked=0, Total=650 [2018-12-03 18:02:17,034 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand 26 states. [2018-12-03 18:02:17,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:17,402 INFO L93 Difference]: Finished difference Result 72 states and 73 transitions. [2018-12-03 18:02:17,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 18:02:17,403 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 63 [2018-12-03 18:02:17,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:17,404 INFO L225 Difference]: With dead ends: 72 [2018-12-03 18:02:17,404 INFO L226 Difference]: Without dead ends: 70 [2018-12-03 18:02:17,404 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 103 SyntacticMatches, 40 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 902 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=807, Invalid=1355, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 18:02:17,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-12-03 18:02:17,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2018-12-03 18:02:17,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-03 18:02:17,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-12-03 18:02:17,419 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 63 [2018-12-03 18:02:17,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:17,419 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-12-03 18:02:17,419 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 18:02:17,419 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-12-03 18:02:17,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-12-03 18:02:17,420 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:17,420 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1] [2018-12-03 18:02:17,420 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:17,420 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:17,420 INFO L82 PathProgramCache]: Analyzing trace with hash 651398703, now seen corresponding path program 39 times [2018-12-03 18:02:17,420 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:17,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:17,421 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:17,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:17,421 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:17,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:18,442 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 420 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:18,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:18,442 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:18,442 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:18,442 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:18,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:18,442 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:18,452 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:02:18,453 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:02:18,502 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:02:18,502 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:18,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:19,786 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 420 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:19,786 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:20,520 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 420 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:20,539 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:20,539 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-12-03 18:02:20,540 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:20,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-03 18:02:20,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-03 18:02:20,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1471, Invalid=5839, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 18:02:20,542 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 86 states. [2018-12-03 18:02:21,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:21,784 INFO L93 Difference]: Finished difference Result 112 states and 114 transitions. [2018-12-03 18:02:21,784 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 18:02:21,784 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 65 [2018-12-03 18:02:21,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:21,784 INFO L225 Difference]: With dead ends: 112 [2018-12-03 18:02:21,785 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 18:02:21,785 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 46 SyntacticMatches, 41 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5882 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2227, Invalid=9115, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 18:02:21,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 18:02:21,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-12-03 18:02:21,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-12-03 18:02:21,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-12-03 18:02:21,797 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 65 [2018-12-03 18:02:21,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:21,797 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-12-03 18:02:21,797 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-03 18:02:21,797 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-12-03 18:02:21,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-12-03 18:02:21,797 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:21,797 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1] [2018-12-03 18:02:21,798 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:21,798 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:21,798 INFO L82 PathProgramCache]: Analyzing trace with hash -1197356584, now seen corresponding path program 40 times [2018-12-03 18:02:21,798 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:21,798 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:21,799 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:21,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:21,799 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:21,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:22,129 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 231 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:22,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:22,129 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:22,129 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:22,129 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:22,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:22,129 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:22,138 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:22,138 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:02:22,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:22,192 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:22,242 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 231 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:22,242 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:22,679 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 231 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:22,697 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:22,698 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 26 [2018-12-03 18:02:22,698 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:22,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 18:02:22,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 18:02:22,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=397, Unknown=0, NotChecked=0, Total=702 [2018-12-03 18:02:22,699 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 27 states. [2018-12-03 18:02:23,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:23,115 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2018-12-03 18:02:23,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 18:02:23,115 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 66 [2018-12-03 18:02:23,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:23,116 INFO L225 Difference]: With dead ends: 75 [2018-12-03 18:02:23,116 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 18:02:23,117 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 108 SyntacticMatches, 42 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 989 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=878, Invalid=1474, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 18:02:23,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 18:02:23,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 69. [2018-12-03 18:02:23,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-03 18:02:23,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-12-03 18:02:23,134 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 66 [2018-12-03 18:02:23,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:23,135 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-12-03 18:02:23,135 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 18:02:23,135 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-12-03 18:02:23,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-12-03 18:02:23,135 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:23,135 INFO L402 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1] [2018-12-03 18:02:23,136 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:23,136 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:23,136 INFO L82 PathProgramCache]: Analyzing trace with hash 391610418, now seen corresponding path program 41 times [2018-12-03 18:02:23,136 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:23,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:23,137 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:23,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:23,137 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:23,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:24,001 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 462 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:24,001 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:24,001 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:24,001 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:24,001 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:24,001 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:24,001 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:24,010 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:02:24,010 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:02:24,077 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-12-03 18:02:24,077 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:24,080 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:25,768 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 462 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:25,768 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:26,369 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 462 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:26,387 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:26,388 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 89 [2018-12-03 18:02:26,388 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:26,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-12-03 18:02:26,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-12-03 18:02:26,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1607, Invalid=6403, Unknown=0, NotChecked=0, Total=8010 [2018-12-03 18:02:26,389 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 90 states. [2018-12-03 18:02:28,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:28,181 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2018-12-03 18:02:28,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-12-03 18:02:28,181 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 68 [2018-12-03 18:02:28,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:28,182 INFO L225 Difference]: With dead ends: 117 [2018-12-03 18:02:28,182 INFO L226 Difference]: Without dead ends: 70 [2018-12-03 18:02:28,183 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 48 SyntacticMatches, 43 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6470 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2432, Invalid=10000, Unknown=0, NotChecked=0, Total=12432 [2018-12-03 18:02:28,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-12-03 18:02:28,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-12-03 18:02:28,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-12-03 18:02:28,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2018-12-03 18:02:28,195 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 68 [2018-12-03 18:02:28,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:28,195 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2018-12-03 18:02:28,195 INFO L481 AbstractCegarLoop]: Interpolant automaton has 90 states. [2018-12-03 18:02:28,195 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2018-12-03 18:02:28,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-12-03 18:02:28,196 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:28,196 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1] [2018-12-03 18:02:28,196 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:28,196 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:28,196 INFO L82 PathProgramCache]: Analyzing trace with hash -1511507991, now seen corresponding path program 42 times [2018-12-03 18:02:28,196 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:28,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:28,197 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:28,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:28,197 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:28,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:28,730 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 253 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:28,730 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:28,730 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:28,731 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:28,731 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:28,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:28,731 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:28,739 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:02:28,739 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:02:28,796 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:02:28,796 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:28,799 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:28,844 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 253 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:28,844 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:29,281 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 253 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:29,299 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:29,300 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 27 [2018-12-03 18:02:29,300 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:29,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-12-03 18:02:29,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-12-03 18:02:29,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=330, Invalid=426, Unknown=0, NotChecked=0, Total=756 [2018-12-03 18:02:29,301 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand 28 states. [2018-12-03 18:02:29,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:29,745 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2018-12-03 18:02:29,745 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-12-03 18:02:29,745 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 69 [2018-12-03 18:02:29,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:29,746 INFO L225 Difference]: With dead ends: 78 [2018-12-03 18:02:29,746 INFO L226 Difference]: Without dead ends: 76 [2018-12-03 18:02:29,746 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 113 SyntacticMatches, 44 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1080 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=952, Invalid=1598, Unknown=0, NotChecked=0, Total=2550 [2018-12-03 18:02:29,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-12-03 18:02:29,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 72. [2018-12-03 18:02:29,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-12-03 18:02:29,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-12-03 18:02:29,761 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 69 [2018-12-03 18:02:29,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:29,762 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-12-03 18:02:29,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-12-03 18:02:29,762 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-12-03 18:02:29,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-12-03 18:02:29,762 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:29,762 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1] [2018-12-03 18:02:29,762 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:29,762 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:29,763 INFO L82 PathProgramCache]: Analyzing trace with hash -860180989, now seen corresponding path program 43 times [2018-12-03 18:02:29,763 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:29,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:29,763 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:29,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:29,764 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:29,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:30,895 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 506 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:30,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:30,895 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:30,896 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:30,896 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:30,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:30,896 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:30,904 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:30,905 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:02:30,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:30,963 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:32,536 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 506 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:32,536 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:33,233 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 506 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:33,252 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:33,253 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-12-03 18:02:33,253 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:33,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 94 states [2018-12-03 18:02:33,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2018-12-03 18:02:33,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1749, Invalid=6993, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 18:02:33,255 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 94 states. [2018-12-03 18:02:34,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:34,171 INFO L93 Difference]: Finished difference Result 122 states and 124 transitions. [2018-12-03 18:02:34,171 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-03 18:02:34,171 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 71 [2018-12-03 18:02:34,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:34,172 INFO L225 Difference]: With dead ends: 122 [2018-12-03 18:02:34,172 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 18:02:34,173 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 50 SyntacticMatches, 45 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7086 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2646, Invalid=10926, Unknown=0, NotChecked=0, Total=13572 [2018-12-03 18:02:34,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 18:02:34,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2018-12-03 18:02:34,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 18:02:34,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2018-12-03 18:02:34,186 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 71 [2018-12-03 18:02:34,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:34,187 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2018-12-03 18:02:34,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has 94 states. [2018-12-03 18:02:34,187 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2018-12-03 18:02:34,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 18:02:34,187 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:34,187 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1] [2018-12-03 18:02:34,187 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:34,188 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:34,188 INFO L82 PathProgramCache]: Analyzing trace with hash 1202570988, now seen corresponding path program 44 times [2018-12-03 18:02:34,188 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:34,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:34,188 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:34,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:34,189 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:34,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:34,741 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 276 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:34,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:34,741 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:34,741 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:34,742 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:34,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:34,742 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:34,750 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:02:34,750 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:02:34,823 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-12-03 18:02:34,823 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:34,826 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:34,871 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 276 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:34,871 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:35,284 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 276 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:35,303 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:35,303 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 28 [2018-12-03 18:02:35,303 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:35,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 18:02:35,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 18:02:35,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=456, Unknown=0, NotChecked=0, Total=812 [2018-12-03 18:02:35,304 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand 29 states. [2018-12-03 18:02:35,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:35,962 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2018-12-03 18:02:35,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 18:02:35,962 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2018-12-03 18:02:35,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:35,963 INFO L225 Difference]: With dead ends: 81 [2018-12-03 18:02:35,963 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 18:02:35,964 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 118 SyntacticMatches, 46 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1175 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1029, Invalid=1727, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 18:02:35,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 18:02:35,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 75. [2018-12-03 18:02:35,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-03 18:02:35,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-12-03 18:02:35,981 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 72 [2018-12-03 18:02:35,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:35,981 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-12-03 18:02:35,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 18:02:35,981 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-12-03 18:02:35,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-12-03 18:02:35,982 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:35,982 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1] [2018-12-03 18:02:35,982 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:35,982 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:35,982 INFO L82 PathProgramCache]: Analyzing trace with hash 324569158, now seen corresponding path program 45 times [2018-12-03 18:02:35,982 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:35,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:35,983 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:35,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:35,983 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:35,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:37,379 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 552 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:37,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:37,380 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:37,380 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:37,380 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:37,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:37,380 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:37,392 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:02:37,392 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:02:37,449 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:02:37,450 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:37,453 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:39,728 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 552 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:39,728 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:40,585 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 552 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:40,604 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:40,604 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-12-03 18:02:40,604 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:40,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2018-12-03 18:02:40,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2018-12-03 18:02:40,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1897, Invalid=7609, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 18:02:40,606 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 98 states. [2018-12-03 18:02:42,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:42,938 INFO L93 Difference]: Finished difference Result 127 states and 129 transitions. [2018-12-03 18:02:42,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-03 18:02:42,938 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 74 [2018-12-03 18:02:42,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:42,939 INFO L225 Difference]: With dead ends: 127 [2018-12-03 18:02:42,939 INFO L226 Difference]: Without dead ends: 76 [2018-12-03 18:02:42,940 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 52 SyntacticMatches, 47 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7730 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=2869, Invalid=11893, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 18:02:42,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-12-03 18:02:42,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2018-12-03 18:02:42,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-12-03 18:02:42,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2018-12-03 18:02:42,954 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 74 [2018-12-03 18:02:42,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:42,954 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2018-12-03 18:02:42,954 INFO L481 AbstractCegarLoop]: Interpolant automaton has 98 states. [2018-12-03 18:02:42,954 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2018-12-03 18:02:42,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-12-03 18:02:42,955 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:42,955 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1] [2018-12-03 18:02:42,955 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:42,955 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:42,955 INFO L82 PathProgramCache]: Analyzing trace with hash -623355203, now seen corresponding path program 46 times [2018-12-03 18:02:42,956 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:42,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:42,956 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:42,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:42,957 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:42,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:43,409 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 300 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:43,409 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:43,409 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:43,410 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:43,410 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:43,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:43,410 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:43,419 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:43,419 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:02:43,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:43,482 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:43,534 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 300 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:43,534 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:44,006 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 300 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:44,026 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:44,026 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 29 [2018-12-03 18:02:44,026 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:44,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-12-03 18:02:44,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-12-03 18:02:44,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=487, Unknown=0, NotChecked=0, Total=870 [2018-12-03 18:02:44,027 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand 30 states. [2018-12-03 18:02:44,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:44,503 INFO L93 Difference]: Finished difference Result 84 states and 85 transitions. [2018-12-03 18:02:44,503 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 18:02:44,504 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 75 [2018-12-03 18:02:44,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:44,505 INFO L225 Difference]: With dead ends: 84 [2018-12-03 18:02:44,505 INFO L226 Difference]: Without dead ends: 82 [2018-12-03 18:02:44,505 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 123 SyntacticMatches, 48 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1274 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1109, Invalid=1861, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 18:02:44,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-12-03 18:02:44,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 78. [2018-12-03 18:02:44,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-12-03 18:02:44,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-12-03 18:02:44,522 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 75 [2018-12-03 18:02:44,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:44,522 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-12-03 18:02:44,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-12-03 18:02:44,522 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-12-03 18:02:44,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-12-03 18:02:44,522 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:44,522 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1] [2018-12-03 18:02:44,523 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:44,523 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:44,523 INFO L82 PathProgramCache]: Analyzing trace with hash -2043843625, now seen corresponding path program 47 times [2018-12-03 18:02:44,523 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:44,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:44,524 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:44,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:44,524 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:44,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:45,792 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 600 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:45,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:45,793 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:45,793 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:45,793 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:45,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:45,793 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:45,801 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:02:45,801 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:02:45,896 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-12-03 18:02:45,896 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:45,899 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:47,795 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 600 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:47,795 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:48,582 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 600 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:48,602 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:48,603 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 101 [2018-12-03 18:02:48,603 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:48,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2018-12-03 18:02:48,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2018-12-03 18:02:48,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2051, Invalid=8251, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 18:02:48,605 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 102 states. [2018-12-03 18:02:50,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:50,190 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2018-12-03 18:02:50,190 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-12-03 18:02:50,190 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 77 [2018-12-03 18:02:50,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:50,191 INFO L225 Difference]: With dead ends: 132 [2018-12-03 18:02:50,191 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 18:02:50,193 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 54 SyntacticMatches, 49 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8402 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=3101, Invalid=12901, Unknown=0, NotChecked=0, Total=16002 [2018-12-03 18:02:50,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 18:02:50,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-12-03 18:02:50,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-12-03 18:02:50,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-12-03 18:02:50,230 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 77 [2018-12-03 18:02:50,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:50,230 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-12-03 18:02:50,230 INFO L481 AbstractCegarLoop]: Interpolant automaton has 102 states. [2018-12-03 18:02:50,230 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-12-03 18:02:50,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-12-03 18:02:50,230 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:50,230 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1] [2018-12-03 18:02:50,231 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:50,231 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:50,231 INFO L82 PathProgramCache]: Analyzing trace with hash 2046456320, now seen corresponding path program 48 times [2018-12-03 18:02:50,231 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:50,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:50,232 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:50,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:50,232 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:50,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:51,063 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:51,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:51,064 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:51,064 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:51,064 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:51,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:51,064 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:51,073 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:02:51,073 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:02:51,138 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:02:51,138 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:51,141 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:51,221 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:51,221 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:51,859 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:51,878 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:51,878 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 30 [2018-12-03 18:02:51,878 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:51,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-12-03 18:02:51,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-12-03 18:02:51,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=411, Invalid=519, Unknown=0, NotChecked=0, Total=930 [2018-12-03 18:02:51,879 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 31 states. [2018-12-03 18:02:52,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:52,378 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2018-12-03 18:02:52,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 18:02:52,379 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 78 [2018-12-03 18:02:52,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:52,379 INFO L225 Difference]: With dead ends: 87 [2018-12-03 18:02:52,380 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 18:02:52,380 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 128 SyntacticMatches, 50 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1377 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1192, Invalid=2000, Unknown=0, NotChecked=0, Total=3192 [2018-12-03 18:02:52,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 18:02:52,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 81. [2018-12-03 18:02:52,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-03 18:02:52,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2018-12-03 18:02:52,398 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 78 [2018-12-03 18:02:52,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:52,398 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2018-12-03 18:02:52,399 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-12-03 18:02:52,399 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2018-12-03 18:02:52,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-12-03 18:02:52,399 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:52,399 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1] [2018-12-03 18:02:52,400 INFO L423 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:52,400 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:52,400 INFO L82 PathProgramCache]: Analyzing trace with hash -450445734, now seen corresponding path program 49 times [2018-12-03 18:02:52,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:52,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:52,402 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:52,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:52,402 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:52,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:54,114 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 650 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:54,114 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:54,114 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:54,114 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:54,114 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:54,114 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:54,114 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:02:54,124 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:54,124 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:02:54,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:54,190 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:56,146 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 650 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:56,146 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:57,059 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 650 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:57,078 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:57,078 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-12-03 18:02:57,078 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:57,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 106 states [2018-12-03 18:02:57,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2018-12-03 18:02:57,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=8919, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 18:02:57,081 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand 106 states. [2018-12-03 18:02:59,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:59,744 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2018-12-03 18:02:59,744 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 18:02:59,745 INFO L78 Accepts]: Start accepts. Automaton has 106 states. Word has length 80 [2018-12-03 18:02:59,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:59,746 INFO L225 Difference]: With dead ends: 137 [2018-12-03 18:02:59,746 INFO L226 Difference]: Without dead ends: 82 [2018-12-03 18:02:59,747 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 56 SyntacticMatches, 51 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9102 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=3342, Invalid=13950, Unknown=0, NotChecked=0, Total=17292 [2018-12-03 18:02:59,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-12-03 18:02:59,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2018-12-03 18:02:59,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-12-03 18:02:59,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-12-03 18:02:59,770 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 80 [2018-12-03 18:02:59,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:59,771 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-12-03 18:02:59,771 INFO L481 AbstractCegarLoop]: Interpolant automaton has 106 states. [2018-12-03 18:02:59,771 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-12-03 18:02:59,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-12-03 18:02:59,771 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:59,771 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1] [2018-12-03 18:02:59,772 INFO L423 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:59,772 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:59,772 INFO L82 PathProgramCache]: Analyzing trace with hash 1158060945, now seen corresponding path program 50 times [2018-12-03 18:02:59,772 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:59,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:59,773 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:59,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:59,773 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:59,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:00,621 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:00,621 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:00,622 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:00,622 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:00,622 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:00,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:00,622 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-12-03 18:03:00,640 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:03:00,641 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:03:00,780 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2018-12-03 18:03:00,780 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:00,783 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:00,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:00,827 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:01,456 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:01,475 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:01,475 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 31 [2018-12-03 18:03:01,476 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:01,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 18:03:01,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 18:03:01,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=440, Invalid=552, Unknown=0, NotChecked=0, Total=992 [2018-12-03 18:03:01,477 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 32 states. [2018-12-03 18:03:02,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:02,076 INFO L93 Difference]: Finished difference Result 90 states and 91 transitions. [2018-12-03 18:03:02,076 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 18:03:02,076 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 81 [2018-12-03 18:03:02,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:02,077 INFO L225 Difference]: With dead ends: 90 [2018-12-03 18:03:02,077 INFO L226 Difference]: Without dead ends: 88 [2018-12-03 18:03:02,078 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 133 SyntacticMatches, 52 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1484 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1278, Invalid=2144, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 18:03:02,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-12-03 18:03:02,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2018-12-03 18:03:02,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-12-03 18:03:02,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2018-12-03 18:03:02,096 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 81 [2018-12-03 18:03:02,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:02,096 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2018-12-03 18:03:02,096 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 18:03:02,096 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2018-12-03 18:03:02,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-12-03 18:03:02,096 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:02,097 INFO L402 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1] [2018-12-03 18:03:02,097 INFO L423 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:02,097 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:02,097 INFO L82 PathProgramCache]: Analyzing trace with hash 500090795, now seen corresponding path program 51 times [2018-12-03 18:03:02,097 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:02,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:02,098 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:02,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:02,098 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:02,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:03,295 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 702 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:03,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:03,296 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:03,296 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:03,296 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:03,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:03,296 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-12-03 18:03:03,308 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:03:03,308 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:03:03,373 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:03:03,373 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:03,379 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:05,512 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 702 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:05,513 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:06,669 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 702 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:06,689 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:06,690 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 109 [2018-12-03 18:03:06,690 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:06,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2018-12-03 18:03:06,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2018-12-03 18:03:06,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2377, Invalid=9613, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 18:03:06,691 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand 110 states. [2018-12-03 18:03:08,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:08,801 INFO L93 Difference]: Finished difference Result 142 states and 144 transitions. [2018-12-03 18:03:08,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-12-03 18:03:08,801 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 83 [2018-12-03 18:03:08,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:08,802 INFO L225 Difference]: With dead ends: 142 [2018-12-03 18:03:08,802 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 18:03:08,803 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 58 SyntacticMatches, 53 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9830 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=3592, Invalid=15040, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 18:03:08,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 18:03:08,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2018-12-03 18:03:08,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-12-03 18:03:08,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2018-12-03 18:03:08,821 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 83 [2018-12-03 18:03:08,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:08,821 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2018-12-03 18:03:08,821 INFO L481 AbstractCegarLoop]: Interpolant automaton has 110 states. [2018-12-03 18:03:08,822 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2018-12-03 18:03:08,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-12-03 18:03:08,822 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:08,822 INFO L402 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1] [2018-12-03 18:03:08,822 INFO L423 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:08,822 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:08,822 INFO L82 PathProgramCache]: Analyzing trace with hash 572443412, now seen corresponding path program 52 times [2018-12-03 18:03:08,823 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:08,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:08,823 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:08,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:08,823 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:08,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:09,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 378 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:09,291 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:09,291 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:09,291 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:09,291 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:09,291 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:09,291 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-12-03 18:03:09,299 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:09,299 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:03:09,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:09,366 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:09,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 378 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:09,456 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:10,103 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 378 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:10,122 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:10,123 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 32 [2018-12-03 18:03:10,123 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:10,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-12-03 18:03:10,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-12-03 18:03:10,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=586, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 18:03:10,124 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand 33 states. [2018-12-03 18:03:11,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:11,157 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2018-12-03 18:03:11,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 18:03:11,158 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 84 [2018-12-03 18:03:11,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:11,158 INFO L225 Difference]: With dead ends: 93 [2018-12-03 18:03:11,158 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 18:03:11,159 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 138 SyntacticMatches, 54 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1595 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1367, Invalid=2293, Unknown=0, NotChecked=0, Total=3660 [2018-12-03 18:03:11,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 18:03:11,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 87. [2018-12-03 18:03:11,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 18:03:11,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-12-03 18:03:11,182 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 84 [2018-12-03 18:03:11,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:11,183 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-12-03 18:03:11,183 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-12-03 18:03:11,183 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-12-03 18:03:11,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 18:03:11,183 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:11,183 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1] [2018-12-03 18:03:11,184 INFO L423 AbstractCegarLoop]: === Iteration 55 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:11,184 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:11,184 INFO L82 PathProgramCache]: Analyzing trace with hash 362357358, now seen corresponding path program 53 times [2018-12-03 18:03:11,184 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:11,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:11,185 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:11,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:11,185 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:11,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:12,431 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 756 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:12,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:12,431 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:12,431 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:12,431 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:12,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:12,431 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-12-03 18:03:12,442 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:03:12,442 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:03:12,539 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-12-03 18:03:12,539 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:12,543 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:14,665 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 756 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:14,666 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:15,627 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 756 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:15,647 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:15,647 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 113 [2018-12-03 18:03:15,647 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:15,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 114 states [2018-12-03 18:03:15,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2018-12-03 18:03:15,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2549, Invalid=10333, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 18:03:15,649 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 114 states. [2018-12-03 18:03:18,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:18,080 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-12-03 18:03:18,080 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-12-03 18:03:18,080 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 86 [2018-12-03 18:03:18,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:18,081 INFO L225 Difference]: With dead ends: 147 [2018-12-03 18:03:18,081 INFO L226 Difference]: Without dead ends: 88 [2018-12-03 18:03:18,083 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 60 SyntacticMatches, 55 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10586 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=3851, Invalid=16171, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 18:03:18,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-12-03 18:03:18,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-12-03 18:03:18,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-12-03 18:03:18,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2018-12-03 18:03:18,103 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 86 [2018-12-03 18:03:18,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:18,103 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2018-12-03 18:03:18,103 INFO L481 AbstractCegarLoop]: Interpolant automaton has 114 states. [2018-12-03 18:03:18,103 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2018-12-03 18:03:18,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-12-03 18:03:18,104 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:18,104 INFO L402 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1] [2018-12-03 18:03:18,104 INFO L423 AbstractCegarLoop]: === Iteration 56 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:18,104 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:18,105 INFO L82 PathProgramCache]: Analyzing trace with hash -254412187, now seen corresponding path program 54 times [2018-12-03 18:03:18,105 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:18,105 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:18,105 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:18,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:18,106 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:18,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:18,577 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 406 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:18,577 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:18,578 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:18,578 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:18,578 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:18,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:18,578 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:03:18,587 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:03:18,588 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:03:18,656 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:03:18,656 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:18,660 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:18,842 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 406 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:18,842 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:19,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 406 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:19,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:19,442 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 33 [2018-12-03 18:03:19,442 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:19,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-12-03 18:03:19,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-12-03 18:03:19,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=621, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 18:03:19,443 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand 34 states. [2018-12-03 18:03:20,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:20,014 INFO L93 Difference]: Finished difference Result 96 states and 97 transitions. [2018-12-03 18:03:20,015 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-12-03 18:03:20,015 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 87 [2018-12-03 18:03:20,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:20,015 INFO L225 Difference]: With dead ends: 96 [2018-12-03 18:03:20,016 INFO L226 Difference]: Without dead ends: 94 [2018-12-03 18:03:20,016 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 143 SyntacticMatches, 56 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1710 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1459, Invalid=2447, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 18:03:20,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-03 18:03:20,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 90. [2018-12-03 18:03:20,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-12-03 18:03:20,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2018-12-03 18:03:20,042 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 87 [2018-12-03 18:03:20,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:20,042 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2018-12-03 18:03:20,042 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-12-03 18:03:20,042 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2018-12-03 18:03:20,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-12-03 18:03:20,043 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:20,043 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1] [2018-12-03 18:03:20,043 INFO L423 AbstractCegarLoop]: === Iteration 57 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:20,043 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:20,043 INFO L82 PathProgramCache]: Analyzing trace with hash 323076479, now seen corresponding path program 55 times [2018-12-03 18:03:20,044 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:20,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:20,044 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:20,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:20,045 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:20,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:21,184 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 812 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:21,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:21,184 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:21,184 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:21,184 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:21,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:21,184 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:03:21,194 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:21,194 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:03:21,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:21,266 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:23,551 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 812 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:23,552 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:24,621 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 812 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:24,641 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:24,641 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 117 [2018-12-03 18:03:24,642 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:24,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 118 states [2018-12-03 18:03:24,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2018-12-03 18:03:24,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2727, Invalid=11079, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 18:03:24,643 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand 118 states. [2018-12-03 18:03:27,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:27,913 INFO L93 Difference]: Finished difference Result 152 states and 154 transitions. [2018-12-03 18:03:27,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-12-03 18:03:27,913 INFO L78 Accepts]: Start accepts. Automaton has 118 states. Word has length 89 [2018-12-03 18:03:27,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:27,914 INFO L225 Difference]: With dead ends: 152 [2018-12-03 18:03:27,914 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 18:03:27,916 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 62 SyntacticMatches, 57 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11370 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=4119, Invalid=17343, Unknown=0, NotChecked=0, Total=21462 [2018-12-03 18:03:27,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 18:03:27,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-12-03 18:03:27,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-12-03 18:03:27,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2018-12-03 18:03:27,944 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 89 [2018-12-03 18:03:27,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:27,944 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2018-12-03 18:03:27,944 INFO L481 AbstractCegarLoop]: Interpolant automaton has 118 states. [2018-12-03 18:03:27,945 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2018-12-03 18:03:27,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-12-03 18:03:27,945 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:27,945 INFO L402 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1] [2018-12-03 18:03:27,945 INFO L423 AbstractCegarLoop]: === Iteration 58 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:27,946 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:27,946 INFO L82 PathProgramCache]: Analyzing trace with hash 11653672, now seen corresponding path program 56 times [2018-12-03 18:03:27,946 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:27,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:27,947 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:27,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:27,947 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:27,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:28,512 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:28,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:28,513 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:28,513 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:28,513 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:28,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:28,513 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:03:28,523 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:03:28,523 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:03:28,663 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-12-03 18:03:28,664 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:28,667 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:28,735 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:28,735 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:29,483 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:29,502 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:29,502 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 34 [2018-12-03 18:03:29,502 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:29,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 18:03:29,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 18:03:29,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=533, Invalid=657, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 18:03:29,504 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand 35 states. [2018-12-03 18:03:30,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:30,142 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-12-03 18:03:30,142 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 18:03:30,143 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 90 [2018-12-03 18:03:30,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:30,144 INFO L225 Difference]: With dead ends: 99 [2018-12-03 18:03:30,144 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 18:03:30,145 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 148 SyntacticMatches, 58 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1829 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1554, Invalid=2606, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 18:03:30,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 18:03:30,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 93. [2018-12-03 18:03:30,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-03 18:03:30,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2018-12-03 18:03:30,177 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 90 [2018-12-03 18:03:30,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:30,178 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2018-12-03 18:03:30,178 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 18:03:30,178 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2018-12-03 18:03:30,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-12-03 18:03:30,179 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:30,179 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1] [2018-12-03 18:03:30,179 INFO L423 AbstractCegarLoop]: === Iteration 59 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:30,179 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:30,179 INFO L82 PathProgramCache]: Analyzing trace with hash -1685670782, now seen corresponding path program 57 times [2018-12-03 18:03:30,180 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:30,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:30,180 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:30,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:30,181 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:30,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:31,692 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 870 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:31,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:31,692 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:31,692 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:31,692 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:31,693 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:31,693 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:03:31,701 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:03:31,702 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:03:31,774 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:03:31,774 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:31,778 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:34,348 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 870 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:34,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:35,530 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 870 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:35,549 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:35,550 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 121 [2018-12-03 18:03:35,550 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:35,550 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2018-12-03 18:03:35,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2018-12-03 18:03:35,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2911, Invalid=11851, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 18:03:35,552 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand 122 states. [2018-12-03 18:03:36,193 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-12-03 18:03:38,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:38,482 INFO L93 Difference]: Finished difference Result 157 states and 159 transitions. [2018-12-03 18:03:38,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-03 18:03:38,482 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 92 [2018-12-03 18:03:38,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:38,483 INFO L225 Difference]: With dead ends: 157 [2018-12-03 18:03:38,483 INFO L226 Difference]: Without dead ends: 94 [2018-12-03 18:03:38,484 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 64 SyntacticMatches, 59 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12182 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=4396, Invalid=18556, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 18:03:38,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-03 18:03:38,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2018-12-03 18:03:38,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-12-03 18:03:38,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-12-03 18:03:38,505 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 92 [2018-12-03 18:03:38,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:38,506 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-12-03 18:03:38,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has 122 states. [2018-12-03 18:03:38,506 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-12-03 18:03:38,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-12-03 18:03:38,506 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:38,506 INFO L402 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1] [2018-12-03 18:03:38,506 INFO L423 AbstractCegarLoop]: === Iteration 60 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:38,507 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:38,507 INFO L82 PathProgramCache]: Analyzing trace with hash 2141812537, now seen corresponding path program 58 times [2018-12-03 18:03:38,507 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:38,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:38,507 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:38,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:38,508 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:38,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:39,037 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 465 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:39,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:39,037 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:39,037 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:39,037 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:39,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:39,037 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:03:39,048 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:39,048 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:03:39,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:39,123 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:39,172 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 465 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:39,173 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:39,860 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 465 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:39,880 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:39,880 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 35 [2018-12-03 18:03:39,880 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:39,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-12-03 18:03:39,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-12-03 18:03:39,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=566, Invalid=694, Unknown=0, NotChecked=0, Total=1260 [2018-12-03 18:03:39,881 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 36 states. [2018-12-03 18:03:40,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:40,525 INFO L93 Difference]: Finished difference Result 102 states and 103 transitions. [2018-12-03 18:03:40,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 18:03:40,525 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 93 [2018-12-03 18:03:40,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:40,526 INFO L225 Difference]: With dead ends: 102 [2018-12-03 18:03:40,526 INFO L226 Difference]: Without dead ends: 100 [2018-12-03 18:03:40,527 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 153 SyntacticMatches, 60 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1952 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1652, Invalid=2770, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 18:03:40,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-12-03 18:03:40,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 96. [2018-12-03 18:03:40,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-12-03 18:03:40,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2018-12-03 18:03:40,552 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 93 [2018-12-03 18:03:40,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:40,552 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2018-12-03 18:03:40,552 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-12-03 18:03:40,552 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2018-12-03 18:03:40,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-12-03 18:03:40,553 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:40,553 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1] [2018-12-03 18:03:40,553 INFO L423 AbstractCegarLoop]: === Iteration 61 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:40,553 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:40,553 INFO L82 PathProgramCache]: Analyzing trace with hash 992565587, now seen corresponding path program 59 times [2018-12-03 18:03:40,553 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:40,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:40,554 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:40,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:40,554 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:40,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:41,857 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 930 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:41,857 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:41,857 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:41,857 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:41,857 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:41,857 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:41,857 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:03:41,889 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:03:41,889 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:03:41,996 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2018-12-03 18:03:41,997 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:42,001 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:45,646 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 930 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:45,646 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:46,815 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 930 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:46,835 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:46,836 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 125 [2018-12-03 18:03:46,836 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:46,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 126 states [2018-12-03 18:03:46,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2018-12-03 18:03:46,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3101, Invalid=12649, Unknown=0, NotChecked=0, Total=15750 [2018-12-03 18:03:46,838 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand 126 states. [2018-12-03 18:03:49,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:49,286 INFO L93 Difference]: Finished difference Result 162 states and 164 transitions. [2018-12-03 18:03:49,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-12-03 18:03:49,286 INFO L78 Accepts]: Start accepts. Automaton has 126 states. Word has length 95 [2018-12-03 18:03:49,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:49,287 INFO L225 Difference]: With dead ends: 162 [2018-12-03 18:03:49,287 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 18:03:49,289 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 66 SyntacticMatches, 61 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13022 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=4682, Invalid=19810, Unknown=0, NotChecked=0, Total=24492 [2018-12-03 18:03:49,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 18:03:49,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-12-03 18:03:49,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-12-03 18:03:49,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-12-03 18:03:49,320 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 95 [2018-12-03 18:03:49,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:49,320 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-12-03 18:03:49,320 INFO L481 AbstractCegarLoop]: Interpolant automaton has 126 states. [2018-12-03 18:03:49,320 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-12-03 18:03:49,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-12-03 18:03:49,321 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:49,321 INFO L402 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1] [2018-12-03 18:03:49,321 INFO L423 AbstractCegarLoop]: === Iteration 62 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:49,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:49,321 INFO L82 PathProgramCache]: Analyzing trace with hash -1538619588, now seen corresponding path program 60 times [2018-12-03 18:03:49,322 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:49,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:49,322 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:49,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:49,323 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:49,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:49,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 496 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:49,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:49,885 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:49,885 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:49,886 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:49,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:49,886 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:03:49,897 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:03:49,898 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:03:49,976 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:03:49,976 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:49,980 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:50,032 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 496 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:50,032 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:50,739 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 496 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:50,758 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:50,758 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 36 [2018-12-03 18:03:50,758 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:50,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-12-03 18:03:50,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-12-03 18:03:50,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=600, Invalid=732, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 18:03:50,759 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 37 states. [2018-12-03 18:03:51,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:51,432 INFO L93 Difference]: Finished difference Result 105 states and 106 transitions. [2018-12-03 18:03:51,432 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 18:03:51,433 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 96 [2018-12-03 18:03:51,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:51,433 INFO L225 Difference]: With dead ends: 105 [2018-12-03 18:03:51,434 INFO L226 Difference]: Without dead ends: 103 [2018-12-03 18:03:51,434 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 158 SyntacticMatches, 62 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2079 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1753, Invalid=2939, Unknown=0, NotChecked=0, Total=4692 [2018-12-03 18:03:51,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-03 18:03:51,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 99. [2018-12-03 18:03:51,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-12-03 18:03:51,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2018-12-03 18:03:51,468 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 96 [2018-12-03 18:03:51,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:51,468 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2018-12-03 18:03:51,468 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-12-03 18:03:51,468 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2018-12-03 18:03:51,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-12-03 18:03:51,469 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:51,469 INFO L402 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1] [2018-12-03 18:03:51,469 INFO L423 AbstractCegarLoop]: === Iteration 63 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:51,470 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:51,470 INFO L82 PathProgramCache]: Analyzing trace with hash -1144621930, now seen corresponding path program 61 times [2018-12-03 18:03:51,470 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:51,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:51,471 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:51,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:51,471 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:51,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:52,935 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 992 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:52,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:52,935 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:52,935 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:52,935 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:52,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:52,935 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:03:52,946 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:52,946 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:03:53,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:53,027 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:55,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 992 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:55,910 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:57,391 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 992 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:57,412 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:57,412 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 129 [2018-12-03 18:03:57,412 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:57,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 130 states [2018-12-03 18:03:57,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2018-12-03 18:03:57,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3297, Invalid=13473, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 18:03:57,416 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand 130 states. [2018-12-03 18:04:00,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:00,271 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2018-12-03 18:04:00,271 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-12-03 18:04:00,272 INFO L78 Accepts]: Start accepts. Automaton has 130 states. Word has length 98 [2018-12-03 18:04:00,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:00,272 INFO L225 Difference]: With dead ends: 167 [2018-12-03 18:04:00,272 INFO L226 Difference]: Without dead ends: 100 [2018-12-03 18:04:00,273 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 68 SyntacticMatches, 63 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13890 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=4977, Invalid=21105, Unknown=0, NotChecked=0, Total=26082 [2018-12-03 18:04:00,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-12-03 18:04:00,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2018-12-03 18:04:00,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-12-03 18:04:00,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2018-12-03 18:04:00,305 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 98 [2018-12-03 18:04:00,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:00,305 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2018-12-03 18:04:00,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has 130 states. [2018-12-03 18:04:00,305 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2018-12-03 18:04:00,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-12-03 18:04:00,305 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:00,306 INFO L402 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1] [2018-12-03 18:04:00,306 INFO L423 AbstractCegarLoop]: === Iteration 64 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:00,306 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:00,306 INFO L82 PathProgramCache]: Analyzing trace with hash -941354483, now seen corresponding path program 62 times [2018-12-03 18:04:00,306 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:00,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:00,307 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:00,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:00,307 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:00,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:00,871 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 528 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:00,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:00,872 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:00,872 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:00,872 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:00,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:00,872 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:04:00,881 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:04:00,881 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:04:01,222 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-12-03 18:04:01,222 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:01,226 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:01,267 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 528 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:01,268 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:02,045 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 528 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:02,064 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:02,064 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 37 [2018-12-03 18:04:02,065 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:02,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 18:04:02,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 18:04:02,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=635, Invalid=771, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 18:04:02,066 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 38 states. [2018-12-03 18:04:03,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:03,012 INFO L93 Difference]: Finished difference Result 108 states and 109 transitions. [2018-12-03 18:04:03,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 18:04:03,012 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 99 [2018-12-03 18:04:03,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:03,013 INFO L225 Difference]: With dead ends: 108 [2018-12-03 18:04:03,013 INFO L226 Difference]: Without dead ends: 106 [2018-12-03 18:04:03,014 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 163 SyntacticMatches, 64 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2210 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1857, Invalid=3113, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 18:04:03,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-12-03 18:04:03,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 102. [2018-12-03 18:04:03,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-12-03 18:04:03,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2018-12-03 18:04:03,050 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 99 [2018-12-03 18:04:03,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:03,050 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2018-12-03 18:04:03,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 18:04:03,050 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2018-12-03 18:04:03,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-12-03 18:04:03,051 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:03,051 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1] [2018-12-03 18:04:03,051 INFO L423 AbstractCegarLoop]: === Iteration 65 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:03,051 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:03,052 INFO L82 PathProgramCache]: Analyzing trace with hash 1596493607, now seen corresponding path program 63 times [2018-12-03 18:04:03,052 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:03,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:03,053 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:03,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:03,053 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:03,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:04,603 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 1056 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:04,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:04,604 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:04,604 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:04,604 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:04,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:04,604 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:04:04,618 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:04:04,619 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:04:04,700 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:04:04,700 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:04,707 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:07,658 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 1056 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:07,659 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:09,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 1056 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:09,364 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:09,364 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 133 [2018-12-03 18:04:09,364 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:09,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2018-12-03 18:04:09,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2018-12-03 18:04:09,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3499, Invalid=14323, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 18:04:09,366 INFO L87 Difference]: Start difference. First operand 102 states and 103 transitions. Second operand 134 states. [2018-12-03 18:04:13,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:13,541 INFO L93 Difference]: Finished difference Result 172 states and 174 transitions. [2018-12-03 18:04:13,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-12-03 18:04:13,542 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 101 [2018-12-03 18:04:13,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:13,542 INFO L225 Difference]: With dead ends: 172 [2018-12-03 18:04:13,543 INFO L226 Difference]: Without dead ends: 103 [2018-12-03 18:04:13,544 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 70 SyntacticMatches, 65 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14786 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=5281, Invalid=22441, Unknown=0, NotChecked=0, Total=27722 [2018-12-03 18:04:13,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-03 18:04:13,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2018-12-03 18:04:13,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2018-12-03 18:04:13,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2018-12-03 18:04:13,570 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 101 [2018-12-03 18:04:13,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:13,570 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2018-12-03 18:04:13,570 INFO L481 AbstractCegarLoop]: Interpolant automaton has 134 states. [2018-12-03 18:04:13,570 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2018-12-03 18:04:13,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-12-03 18:04:13,571 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:13,571 INFO L402 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1] [2018-12-03 18:04:13,571 INFO L423 AbstractCegarLoop]: === Iteration 66 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:13,571 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:13,571 INFO L82 PathProgramCache]: Analyzing trace with hash 1233119824, now seen corresponding path program 64 times [2018-12-03 18:04:13,572 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:13,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:13,572 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:13,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:13,572 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:13,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:14,139 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:14,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:14,139 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:14,139 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:14,139 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:14,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:14,139 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:04:14,149 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:14,149 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:04:14,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:14,230 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:14,310 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:14,310 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:15,186 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:15,207 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:15,207 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 38 [2018-12-03 18:04:15,207 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:15,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-12-03 18:04:15,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-12-03 18:04:15,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=671, Invalid=811, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 18:04:15,208 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand 39 states. [2018-12-03 18:04:15,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:15,943 INFO L93 Difference]: Finished difference Result 111 states and 112 transitions. [2018-12-03 18:04:15,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 18:04:15,943 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 102 [2018-12-03 18:04:15,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:15,944 INFO L225 Difference]: With dead ends: 111 [2018-12-03 18:04:15,944 INFO L226 Difference]: Without dead ends: 109 [2018-12-03 18:04:15,944 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 168 SyntacticMatches, 66 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2345 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1964, Invalid=3292, Unknown=0, NotChecked=0, Total=5256 [2018-12-03 18:04:15,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-12-03 18:04:15,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 105. [2018-12-03 18:04:15,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-12-03 18:04:15,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 106 transitions. [2018-12-03 18:04:15,972 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 106 transitions. Word has length 102 [2018-12-03 18:04:15,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:15,972 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 106 transitions. [2018-12-03 18:04:15,972 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-12-03 18:04:15,972 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 106 transitions. [2018-12-03 18:04:15,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-12-03 18:04:15,972 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:15,972 INFO L402 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1] [2018-12-03 18:04:15,973 INFO L423 AbstractCegarLoop]: === Iteration 67 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:15,973 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:15,973 INFO L82 PathProgramCache]: Analyzing trace with hash -382770518, now seen corresponding path program 65 times [2018-12-03 18:04:15,973 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:15,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:15,974 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:15,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:15,974 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:15,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:17,507 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 1122 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:17,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:17,508 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:17,508 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:17,508 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:17,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:17,508 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:04:17,517 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:04:17,517 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:04:17,643 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-12-03 18:04:17,643 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:17,648 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:20,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 1122 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:20,951 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:22,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 1122 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:22,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:22,403 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 137 [2018-12-03 18:04:22,403 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:22,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 138 states [2018-12-03 18:04:22,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 138 interpolants. [2018-12-03 18:04:22,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3707, Invalid=15199, Unknown=0, NotChecked=0, Total=18906 [2018-12-03 18:04:22,405 INFO L87 Difference]: Start difference. First operand 105 states and 106 transitions. Second operand 138 states. [2018-12-03 18:04:26,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:26,057 INFO L93 Difference]: Finished difference Result 177 states and 179 transitions. [2018-12-03 18:04:26,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-12-03 18:04:26,057 INFO L78 Accepts]: Start accepts. Automaton has 138 states. Word has length 104 [2018-12-03 18:04:26,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:26,058 INFO L225 Difference]: With dead ends: 177 [2018-12-03 18:04:26,058 INFO L226 Difference]: Without dead ends: 106 [2018-12-03 18:04:26,059 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 72 SyntacticMatches, 67 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15710 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=5594, Invalid=23818, Unknown=0, NotChecked=0, Total=29412 [2018-12-03 18:04:26,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-12-03 18:04:26,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-12-03 18:04:26,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-12-03 18:04:26,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2018-12-03 18:04:26,087 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 104 [2018-12-03 18:04:26,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:26,087 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2018-12-03 18:04:26,087 INFO L481 AbstractCegarLoop]: Interpolant automaton has 138 states. [2018-12-03 18:04:26,087 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2018-12-03 18:04:26,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-12-03 18:04:26,088 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:26,088 INFO L402 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1] [2018-12-03 18:04:26,088 INFO L423 AbstractCegarLoop]: === Iteration 68 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:26,088 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:26,088 INFO L82 PathProgramCache]: Analyzing trace with hash 1961413345, now seen corresponding path program 66 times [2018-12-03 18:04:26,089 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:26,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:26,089 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:26,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:26,090 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:26,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:26,711 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 595 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:26,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:26,712 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:26,712 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:26,712 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:26,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:26,712 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:04:26,721 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:04:26,721 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:04:26,806 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:04:26,806 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:26,810 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:26,864 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 595 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:26,865 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:27,741 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 595 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:27,760 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:27,760 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 39 [2018-12-03 18:04:27,761 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:27,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-12-03 18:04:27,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-12-03 18:04:27,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=708, Invalid=852, Unknown=0, NotChecked=0, Total=1560 [2018-12-03 18:04:27,762 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand 40 states. [2018-12-03 18:04:28,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:28,719 INFO L93 Difference]: Finished difference Result 114 states and 115 transitions. [2018-12-03 18:04:28,719 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 18:04:28,719 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 105 [2018-12-03 18:04:28,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:28,720 INFO L225 Difference]: With dead ends: 114 [2018-12-03 18:04:28,720 INFO L226 Difference]: Without dead ends: 112 [2018-12-03 18:04:28,720 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 173 SyntacticMatches, 68 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2484 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2074, Invalid=3476, Unknown=0, NotChecked=0, Total=5550 [2018-12-03 18:04:28,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-12-03 18:04:28,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 108. [2018-12-03 18:04:28,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-12-03 18:04:28,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2018-12-03 18:04:28,749 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 105 [2018-12-03 18:04:28,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:28,749 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2018-12-03 18:04:28,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-12-03 18:04:28,750 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2018-12-03 18:04:28,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-12-03 18:04:28,750 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:28,750 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1] [2018-12-03 18:04:28,750 INFO L423 AbstractCegarLoop]: === Iteration 69 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:28,750 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:28,751 INFO L82 PathProgramCache]: Analyzing trace with hash -572366085, now seen corresponding path program 67 times [2018-12-03 18:04:28,751 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:28,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:28,751 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:28,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:28,752 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:28,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:30,436 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 1190 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:30,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:30,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:30,437 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:30,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:30,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:30,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:04:30,445 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:30,446 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:04:30,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:30,532 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:33,915 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 1190 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:33,915 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:35,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 1190 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:35,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:35,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 141 [2018-12-03 18:04:35,494 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:35,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 142 states [2018-12-03 18:04:35,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2018-12-03 18:04:35,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3921, Invalid=16101, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 18:04:35,497 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 142 states. [2018-12-03 18:04:39,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:39,335 INFO L93 Difference]: Finished difference Result 182 states and 184 transitions. [2018-12-03 18:04:39,335 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-03 18:04:39,335 INFO L78 Accepts]: Start accepts. Automaton has 142 states. Word has length 107 [2018-12-03 18:04:39,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:39,336 INFO L225 Difference]: With dead ends: 182 [2018-12-03 18:04:39,336 INFO L226 Difference]: Without dead ends: 109 [2018-12-03 18:04:39,337 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 74 SyntacticMatches, 69 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16662 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=5916, Invalid=25236, Unknown=0, NotChecked=0, Total=31152 [2018-12-03 18:04:39,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-12-03 18:04:39,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2018-12-03 18:04:39,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-12-03 18:04:39,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2018-12-03 18:04:39,365 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 107 [2018-12-03 18:04:39,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:39,365 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2018-12-03 18:04:39,365 INFO L481 AbstractCegarLoop]: Interpolant automaton has 142 states. [2018-12-03 18:04:39,365 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2018-12-03 18:04:39,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2018-12-03 18:04:39,366 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:39,366 INFO L402 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1] [2018-12-03 18:04:39,366 INFO L423 AbstractCegarLoop]: === Iteration 70 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:39,366 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:39,366 INFO L82 PathProgramCache]: Analyzing trace with hash -1159136412, now seen corresponding path program 68 times [2018-12-03 18:04:39,366 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:39,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:39,367 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:39,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:39,367 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:39,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:39,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 630 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:39,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:39,992 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:39,993 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:39,993 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:39,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:39,993 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:04:40,001 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:04:40,001 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:04:40,137 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2018-12-03 18:04:40,137 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:40,141 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:40,198 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 630 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:40,198 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:41,125 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 630 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:41,146 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:41,146 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 40 [2018-12-03 18:04:41,147 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:41,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 18:04:41,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 18:04:41,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=746, Invalid=894, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 18:04:41,148 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 41 states. [2018-12-03 18:04:41,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:41,947 INFO L93 Difference]: Finished difference Result 117 states and 118 transitions. [2018-12-03 18:04:41,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 18:04:41,947 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 108 [2018-12-03 18:04:41,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:41,948 INFO L225 Difference]: With dead ends: 117 [2018-12-03 18:04:41,948 INFO L226 Difference]: Without dead ends: 115 [2018-12-03 18:04:41,949 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 178 SyntacticMatches, 70 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2627 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2187, Invalid=3665, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 18:04:41,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-12-03 18:04:41,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 111. [2018-12-03 18:04:41,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-12-03 18:04:41,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 112 transitions. [2018-12-03 18:04:41,979 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 112 transitions. Word has length 108 [2018-12-03 18:04:41,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:41,979 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 112 transitions. [2018-12-03 18:04:41,979 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 18:04:41,979 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 112 transitions. [2018-12-03 18:04:41,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-12-03 18:04:41,980 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:41,980 INFO L402 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1] [2018-12-03 18:04:41,980 INFO L423 AbstractCegarLoop]: === Iteration 71 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:41,980 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:41,980 INFO L82 PathProgramCache]: Analyzing trace with hash -1533509954, now seen corresponding path program 69 times [2018-12-03 18:04:41,981 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:41,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:41,981 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:41,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:41,982 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:42,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:43,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 1260 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:43,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:43,920 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:43,920 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:43,920 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:43,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:43,920 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:04:43,930 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:04:43,930 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:04:44,016 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:04:44,016 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:44,022 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:47,590 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 1260 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:47,590 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:49,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 1260 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:49,374 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:49,374 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 145 [2018-12-03 18:04:49,374 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:49,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2018-12-03 18:04:49,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2018-12-03 18:04:49,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4141, Invalid=17029, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 18:04:49,377 INFO L87 Difference]: Start difference. First operand 111 states and 112 transitions. Second operand 146 states. [2018-12-03 18:04:54,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:54,246 INFO L93 Difference]: Finished difference Result 187 states and 189 transitions. [2018-12-03 18:04:54,247 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-12-03 18:04:54,247 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 110 [2018-12-03 18:04:54,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:54,247 INFO L225 Difference]: With dead ends: 187 [2018-12-03 18:04:54,247 INFO L226 Difference]: Without dead ends: 112 [2018-12-03 18:04:54,249 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 76 SyntacticMatches, 71 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17642 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=6247, Invalid=26695, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 18:04:54,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-12-03 18:04:54,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2018-12-03 18:04:54,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-12-03 18:04:54,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2018-12-03 18:04:54,278 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 110 [2018-12-03 18:04:54,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:54,278 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2018-12-03 18:04:54,278 INFO L481 AbstractCegarLoop]: Interpolant automaton has 146 states. [2018-12-03 18:04:54,279 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2018-12-03 18:04:54,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-12-03 18:04:54,279 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:54,279 INFO L402 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1] [2018-12-03 18:04:54,279 INFO L423 AbstractCegarLoop]: === Iteration 72 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:54,279 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:54,280 INFO L82 PathProgramCache]: Analyzing trace with hash -1491426891, now seen corresponding path program 70 times [2018-12-03 18:04:54,280 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:54,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:54,280 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:54,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:54,281 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:54,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:54,942 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 666 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:54,942 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:54,943 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:54,943 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:54,943 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:54,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:54,943 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:04:54,952 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:54,952 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:04:55,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:55,041 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:55,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 666 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:55,234 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:56,281 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 666 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:56,301 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:56,301 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 41 [2018-12-03 18:04:56,301 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:56,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-12-03 18:04:56,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-12-03 18:04:56,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=785, Invalid=937, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 18:04:56,302 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand 42 states. [2018-12-03 18:04:57,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:57,136 INFO L93 Difference]: Finished difference Result 120 states and 121 transitions. [2018-12-03 18:04:57,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 18:04:57,137 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 111 [2018-12-03 18:04:57,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:57,137 INFO L225 Difference]: With dead ends: 120 [2018-12-03 18:04:57,138 INFO L226 Difference]: Without dead ends: 118 [2018-12-03 18:04:57,139 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 183 SyntacticMatches, 72 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2774 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2303, Invalid=3859, Unknown=0, NotChecked=0, Total=6162 [2018-12-03 18:04:57,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-12-03 18:04:57,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 114. [2018-12-03 18:04:57,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-12-03 18:04:57,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2018-12-03 18:04:57,171 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 111 [2018-12-03 18:04:57,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:57,171 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2018-12-03 18:04:57,171 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-12-03 18:04:57,171 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2018-12-03 18:04:57,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-12-03 18:04:57,172 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:57,172 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1] [2018-12-03 18:04:57,172 INFO L423 AbstractCegarLoop]: === Iteration 73 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:57,172 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:57,172 INFO L82 PathProgramCache]: Analyzing trace with hash 1257886927, now seen corresponding path program 71 times [2018-12-03 18:04:57,172 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:57,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:57,173 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:57,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:57,173 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:57,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:59,055 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 1332 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:59,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:59,056 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:59,056 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:59,056 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:59,056 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:59,056 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:04:59,064 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:04:59,064 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:04:59,215 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2018-12-03 18:04:59,215 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:59,220 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:02,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 1332 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:02,846 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:04,692 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 1332 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:04,712 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:04,712 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 149 [2018-12-03 18:05:04,712 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:04,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 150 states [2018-12-03 18:05:04,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2018-12-03 18:05:04,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4367, Invalid=17983, Unknown=0, NotChecked=0, Total=22350 [2018-12-03 18:05:04,714 INFO L87 Difference]: Start difference. First operand 114 states and 115 transitions. Second operand 150 states. [2018-12-03 18:05:08,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:08,476 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2018-12-03 18:05:08,476 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-03 18:05:08,476 INFO L78 Accepts]: Start accepts. Automaton has 150 states. Word has length 113 [2018-12-03 18:05:08,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:08,477 INFO L225 Difference]: With dead ends: 192 [2018-12-03 18:05:08,477 INFO L226 Difference]: Without dead ends: 115 [2018-12-03 18:05:08,478 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 78 SyntacticMatches, 73 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18650 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=6587, Invalid=28195, Unknown=0, NotChecked=0, Total=34782 [2018-12-03 18:05:08,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-12-03 18:05:08,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2018-12-03 18:05:08,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-12-03 18:05:08,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2018-12-03 18:05:08,532 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 113 [2018-12-03 18:05:08,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:08,533 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2018-12-03 18:05:08,533 INFO L481 AbstractCegarLoop]: Interpolant automaton has 150 states. [2018-12-03 18:05:08,533 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2018-12-03 18:05:08,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-12-03 18:05:08,533 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:08,533 INFO L402 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1] [2018-12-03 18:05:08,534 INFO L423 AbstractCegarLoop]: === Iteration 74 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:08,534 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:08,534 INFO L82 PathProgramCache]: Analyzing trace with hash 823966328, now seen corresponding path program 72 times [2018-12-03 18:05:08,534 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:08,534 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:08,534 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:05:08,534 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:08,535 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:08,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:09,441 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 703 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:09,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:09,442 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:09,442 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:09,442 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:09,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:09,442 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:05:09,450 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:05:09,450 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:05:09,533 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:05:09,533 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:05:09,538 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:09,601 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 703 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:09,601 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:10,626 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 703 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:10,645 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:10,645 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 42 [2018-12-03 18:05:10,645 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:10,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-12-03 18:05:10,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-12-03 18:05:10,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=825, Invalid=981, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 18:05:10,646 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand 43 states. [2018-12-03 18:05:11,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:11,463 INFO L93 Difference]: Finished difference Result 123 states and 124 transitions. [2018-12-03 18:05:11,463 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-12-03 18:05:11,464 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 114 [2018-12-03 18:05:11,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:11,465 INFO L225 Difference]: With dead ends: 123 [2018-12-03 18:05:11,465 INFO L226 Difference]: Without dead ends: 121 [2018-12-03 18:05:11,466 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 188 SyntacticMatches, 74 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2925 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2422, Invalid=4058, Unknown=0, NotChecked=0, Total=6480 [2018-12-03 18:05:11,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-12-03 18:05:11,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 117. [2018-12-03 18:05:11,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-12-03 18:05:11,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 118 transitions. [2018-12-03 18:05:11,499 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 118 transitions. Word has length 114 [2018-12-03 18:05:11,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:11,499 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 118 transitions. [2018-12-03 18:05:11,499 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-12-03 18:05:11,499 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 118 transitions. [2018-12-03 18:05:11,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-12-03 18:05:11,499 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:11,500 INFO L402 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1] [2018-12-03 18:05:11,500 INFO L423 AbstractCegarLoop]: === Iteration 75 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:11,500 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:11,500 INFO L82 PathProgramCache]: Analyzing trace with hash 1557711058, now seen corresponding path program 73 times [2018-12-03 18:05:11,500 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:11,501 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:11,501 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:05:11,501 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:11,501 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:11,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:13,482 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 1406 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:13,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:13,483 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:13,483 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:13,483 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:13,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:13,483 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:05:13,492 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:05:13,492 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:05:13,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:13,581 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:17,564 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 1406 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:17,564 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:19,464 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 1406 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:19,483 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:19,484 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 153 [2018-12-03 18:05:19,484 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:19,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 154 states [2018-12-03 18:05:19,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2018-12-03 18:05:19,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4599, Invalid=18963, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 18:05:19,486 INFO L87 Difference]: Start difference. First operand 117 states and 118 transitions. Second operand 154 states. [2018-12-03 18:05:22,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:22,992 INFO L93 Difference]: Finished difference Result 197 states and 199 transitions. [2018-12-03 18:05:22,992 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2018-12-03 18:05:22,992 INFO L78 Accepts]: Start accepts. Automaton has 154 states. Word has length 116 [2018-12-03 18:05:22,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:22,993 INFO L225 Difference]: With dead ends: 197 [2018-12-03 18:05:22,993 INFO L226 Difference]: Without dead ends: 118 [2018-12-03 18:05:22,995 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 80 SyntacticMatches, 75 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19686 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=6936, Invalid=29736, Unknown=0, NotChecked=0, Total=36672 [2018-12-03 18:05:22,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-12-03 18:05:23,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2018-12-03 18:05:23,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-12-03 18:05:23,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2018-12-03 18:05:23,026 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 116 [2018-12-03 18:05:23,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:23,026 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2018-12-03 18:05:23,026 INFO L481 AbstractCegarLoop]: Interpolant automaton has 154 states. [2018-12-03 18:05:23,026 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2018-12-03 18:05:23,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-12-03 18:05:23,026 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:23,027 INFO L402 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1] [2018-12-03 18:05:23,027 INFO L423 AbstractCegarLoop]: === Iteration 76 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:23,027 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:23,027 INFO L82 PathProgramCache]: Analyzing trace with hash -1814260087, now seen corresponding path program 74 times [2018-12-03 18:05:23,027 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:23,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:23,028 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:05:23,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:23,028 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:23,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:23,798 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 741 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:23,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:23,798 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:23,798 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:23,799 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:23,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:23,799 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:05:23,807 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:05:23,807 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:05:23,956 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-12-03 18:05:23,956 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:05:23,961 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:24,021 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 741 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:24,021 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:25,147 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 741 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:25,167 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:25,167 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 43 [2018-12-03 18:05:25,167 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:25,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 18:05:25,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 18:05:25,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=866, Invalid=1026, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 18:05:25,168 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand 44 states. [2018-12-03 18:05:26,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:26,018 INFO L93 Difference]: Finished difference Result 126 states and 127 transitions. [2018-12-03 18:05:26,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 18:05:26,018 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 117 [2018-12-03 18:05:26,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:26,019 INFO L225 Difference]: With dead ends: 126 [2018-12-03 18:05:26,019 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 18:05:26,020 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 193 SyntacticMatches, 76 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3080 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2544, Invalid=4262, Unknown=0, NotChecked=0, Total=6806 [2018-12-03 18:05:26,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 18:05:26,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 120. [2018-12-03 18:05:26,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-12-03 18:05:26,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2018-12-03 18:05:26,055 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 117 [2018-12-03 18:05:26,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:26,055 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2018-12-03 18:05:26,055 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 18:05:26,055 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2018-12-03 18:05:26,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-12-03 18:05:26,056 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:26,056 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1] [2018-12-03 18:05:26,056 INFO L423 AbstractCegarLoop]: === Iteration 77 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:26,056 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:26,056 INFO L82 PathProgramCache]: Analyzing trace with hash 252830883, now seen corresponding path program 75 times [2018-12-03 18:05:26,057 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:26,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:26,057 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:05:26,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:26,058 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:26,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:28,102 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 1482 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:28,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:28,103 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:28,103 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:28,103 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:28,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:28,103 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:05:28,112 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:05:28,112 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:05:28,203 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:05:28,203 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:05:28,209 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:32,227 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 1482 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:32,227 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:34,120 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 1482 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:34,140 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:34,140 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 157 [2018-12-03 18:05:34,141 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:34,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2018-12-03 18:05:34,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2018-12-03 18:05:34,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4837, Invalid=19969, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 18:05:34,142 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand 158 states. [2018-12-03 18:05:38,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:38,356 INFO L93 Difference]: Finished difference Result 202 states and 204 transitions. [2018-12-03 18:05:38,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-12-03 18:05:38,356 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 119 [2018-12-03 18:05:38,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:38,357 INFO L225 Difference]: With dead ends: 202 [2018-12-03 18:05:38,357 INFO L226 Difference]: Without dead ends: 121 [2018-12-03 18:05:38,358 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 82 SyntacticMatches, 77 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20750 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=7294, Invalid=31318, Unknown=0, NotChecked=0, Total=38612 [2018-12-03 18:05:38,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-12-03 18:05:38,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2018-12-03 18:05:38,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2018-12-03 18:05:38,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 122 transitions. [2018-12-03 18:05:38,393 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 122 transitions. Word has length 119 [2018-12-03 18:05:38,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:38,393 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 122 transitions. [2018-12-03 18:05:38,393 INFO L481 AbstractCegarLoop]: Interpolant automaton has 158 states. [2018-12-03 18:05:38,393 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 122 transitions. [2018-12-03 18:05:38,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-12-03 18:05:38,393 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:38,393 INFO L402 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1] [2018-12-03 18:05:38,394 INFO L423 AbstractCegarLoop]: === Iteration 78 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:38,394 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:38,394 INFO L82 PathProgramCache]: Analyzing trace with hash 850536332, now seen corresponding path program 76 times [2018-12-03 18:05:38,394 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:38,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:38,395 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:05:38,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:38,395 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:38,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:39,128 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 780 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:39,128 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:39,129 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:39,129 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:39,129 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:39,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:39,129 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:05:39,138 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:05:39,138 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:05:39,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:39,229 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:39,282 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 780 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:39,282 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:40,673 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 780 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:40,692 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:40,692 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 44 [2018-12-03 18:05:40,692 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:40,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 18:05:40,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 18:05:40,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=908, Invalid=1072, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 18:05:40,693 INFO L87 Difference]: Start difference. First operand 121 states and 122 transitions. Second operand 45 states. [2018-12-03 18:05:41,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:41,584 INFO L93 Difference]: Finished difference Result 129 states and 130 transitions. [2018-12-03 18:05:41,584 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 18:05:41,585 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 120 [2018-12-03 18:05:41,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:41,585 INFO L225 Difference]: With dead ends: 129 [2018-12-03 18:05:41,586 INFO L226 Difference]: Without dead ends: 127 [2018-12-03 18:05:41,587 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 198 SyntacticMatches, 78 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3239 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2669, Invalid=4471, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 18:05:41,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-12-03 18:05:41,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 123. [2018-12-03 18:05:41,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-12-03 18:05:41,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 124 transitions. [2018-12-03 18:05:41,621 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 124 transitions. Word has length 120 [2018-12-03 18:05:41,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:41,622 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 124 transitions. [2018-12-03 18:05:41,622 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 18:05:41,622 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 124 transitions. [2018-12-03 18:05:41,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-12-03 18:05:41,622 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:41,622 INFO L402 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1] [2018-12-03 18:05:41,623 INFO L423 AbstractCegarLoop]: === Iteration 79 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:41,623 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:41,623 INFO L82 PathProgramCache]: Analyzing trace with hash 1321681126, now seen corresponding path program 77 times [2018-12-03 18:05:41,623 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:41,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:41,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:05:41,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:41,624 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:41,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:43,719 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 1560 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:43,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:43,719 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:43,719 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:43,719 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:43,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:43,720 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:05:43,729 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:05:43,729 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:05:43,888 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-12-03 18:05:43,888 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:05:43,893 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:48,154 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 1560 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:48,154 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:50,248 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 1560 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:50,267 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:50,268 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 161 [2018-12-03 18:05:50,268 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:50,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 162 states [2018-12-03 18:05:50,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 162 interpolants. [2018-12-03 18:05:50,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5081, Invalid=21001, Unknown=0, NotChecked=0, Total=26082 [2018-12-03 18:05:50,270 INFO L87 Difference]: Start difference. First operand 123 states and 124 transitions. Second operand 162 states. [2018-12-03 18:05:56,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:56,056 INFO L93 Difference]: Finished difference Result 207 states and 209 transitions. [2018-12-03 18:05:56,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2018-12-03 18:05:56,056 INFO L78 Accepts]: Start accepts. Automaton has 162 states. Word has length 122 [2018-12-03 18:05:56,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:56,057 INFO L225 Difference]: With dead ends: 207 [2018-12-03 18:05:56,057 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 18:05:56,059 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 84 SyntacticMatches, 79 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21842 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=7661, Invalid=32941, Unknown=0, NotChecked=0, Total=40602 [2018-12-03 18:05:56,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 18:05:56,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-12-03 18:05:56,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-12-03 18:05:56,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2018-12-03 18:05:56,095 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 122 [2018-12-03 18:05:56,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:56,095 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2018-12-03 18:05:56,095 INFO L481 AbstractCegarLoop]: Interpolant automaton has 162 states. [2018-12-03 18:05:56,095 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2018-12-03 18:05:56,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-12-03 18:05:56,096 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:56,096 INFO L402 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1] [2018-12-03 18:05:56,096 INFO L423 AbstractCegarLoop]: === Iteration 80 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:56,096 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:56,096 INFO L82 PathProgramCache]: Analyzing trace with hash 630303069, now seen corresponding path program 78 times [2018-12-03 18:05:56,096 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:56,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:56,097 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:05:56,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:56,097 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:56,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:56,887 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 820 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:56,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:56,887 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:56,887 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:56,887 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:56,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:56,887 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:05:56,895 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:05:56,896 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:05:56,991 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:05:56,991 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:05:56,997 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:57,058 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 820 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:57,059 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:58,273 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 820 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:58,292 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:58,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 45 [2018-12-03 18:05:58,293 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:58,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-12-03 18:05:58,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-12-03 18:05:58,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=951, Invalid=1119, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 18:05:58,294 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand 46 states. [2018-12-03 18:05:59,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:59,212 INFO L93 Difference]: Finished difference Result 132 states and 133 transitions. [2018-12-03 18:05:59,212 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-12-03 18:05:59,212 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 123 [2018-12-03 18:05:59,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:59,213 INFO L225 Difference]: With dead ends: 132 [2018-12-03 18:05:59,213 INFO L226 Difference]: Without dead ends: 130 [2018-12-03 18:05:59,214 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 203 SyntacticMatches, 80 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3402 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2797, Invalid=4685, Unknown=0, NotChecked=0, Total=7482 [2018-12-03 18:05:59,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-12-03 18:05:59,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 126. [2018-12-03 18:05:59,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-12-03 18:05:59,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2018-12-03 18:05:59,289 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 123 [2018-12-03 18:05:59,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:59,289 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2018-12-03 18:05:59,289 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-12-03 18:05:59,289 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2018-12-03 18:05:59,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-12-03 18:05:59,290 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:59,290 INFO L402 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1] [2018-12-03 18:05:59,290 INFO L423 AbstractCegarLoop]: === Iteration 81 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:59,290 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:59,290 INFO L82 PathProgramCache]: Analyzing trace with hash 130912887, now seen corresponding path program 79 times [2018-12-03 18:05:59,291 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:59,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:59,291 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:05:59,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:59,292 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:59,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:01,722 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 1640 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:01,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:01,723 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:01,723 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:01,723 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:01,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:01,723 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:01,732 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:06:01,733 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:06:01,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:01,826 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:06:06,289 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 1640 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:06,289 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:06:08,371 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 1640 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:08,391 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:06:08,391 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 165 [2018-12-03 18:06:08,391 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:06:08,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 166 states [2018-12-03 18:06:08,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2018-12-03 18:06:08,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5331, Invalid=22059, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 18:06:08,393 INFO L87 Difference]: Start difference. First operand 126 states and 127 transitions. Second operand 166 states. [2018-12-03 18:06:13,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:13,488 INFO L93 Difference]: Finished difference Result 212 states and 214 transitions. [2018-12-03 18:06:13,488 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-12-03 18:06:13,488 INFO L78 Accepts]: Start accepts. Automaton has 166 states. Word has length 125 [2018-12-03 18:06:13,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:13,489 INFO L225 Difference]: With dead ends: 212 [2018-12-03 18:06:13,489 INFO L226 Difference]: Without dead ends: 127 [2018-12-03 18:06:13,491 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 86 SyntacticMatches, 81 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22962 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=8037, Invalid=34605, Unknown=0, NotChecked=0, Total=42642 [2018-12-03 18:06:13,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-12-03 18:06:13,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2018-12-03 18:06:13,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-12-03 18:06:13,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2018-12-03 18:06:13,541 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 125 [2018-12-03 18:06:13,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:13,542 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2018-12-03 18:06:13,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has 166 states. [2018-12-03 18:06:13,542 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2018-12-03 18:06:13,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-12-03 18:06:13,543 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:13,543 INFO L402 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1] [2018-12-03 18:06:13,543 INFO L423 AbstractCegarLoop]: === Iteration 82 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:13,543 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:13,543 INFO L82 PathProgramCache]: Analyzing trace with hash 1950368416, now seen corresponding path program 80 times [2018-12-03 18:06:13,543 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:13,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:13,544 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:06:13,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:13,544 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:13,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:14,417 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 861 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:14,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:14,418 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:14,418 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:14,418 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:14,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:14,418 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:14,427 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:06:14,427 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:06:14,593 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-12-03 18:06:14,593 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:06:14,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:06:14,642 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 861 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:14,643 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:06:16,196 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 861 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:16,216 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:06:16,216 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 44] total 46 [2018-12-03 18:06:16,216 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:06:16,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 18:06:16,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 18:06:16,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=995, Invalid=1167, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 18:06:16,217 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand 47 states. [2018-12-03 18:06:17,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:17,235 INFO L93 Difference]: Finished difference Result 135 states and 136 transitions. [2018-12-03 18:06:17,235 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 18:06:17,236 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 126 [2018-12-03 18:06:17,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:17,237 INFO L225 Difference]: With dead ends: 135 [2018-12-03 18:06:17,237 INFO L226 Difference]: Without dead ends: 133 [2018-12-03 18:06:17,238 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 208 SyntacticMatches, 82 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3569 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2928, Invalid=4904, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 18:06:17,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-12-03 18:06:17,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 129. [2018-12-03 18:06:17,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-12-03 18:06:17,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 130 transitions. [2018-12-03 18:06:17,280 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 130 transitions. Word has length 126 [2018-12-03 18:06:17,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:17,281 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 130 transitions. [2018-12-03 18:06:17,281 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 18:06:17,281 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 130 transitions. [2018-12-03 18:06:17,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-12-03 18:06:17,282 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:17,282 INFO L402 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1] [2018-12-03 18:06:17,282 INFO L423 AbstractCegarLoop]: === Iteration 83 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:17,282 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:17,282 INFO L82 PathProgramCache]: Analyzing trace with hash 1698359034, now seen corresponding path program 81 times [2018-12-03 18:06:17,282 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:17,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:17,283 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:06:17,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:17,283 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:17,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:19,602 INFO L134 CoverageAnalysis]: Checked inductivity of 2583 backedges. 1722 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:19,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:19,602 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:19,602 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:19,602 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:19,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:19,602 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:19,612 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:06:19,612 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:06:19,706 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:06:19,706 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:06:19,712 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:06:24,623 INFO L134 CoverageAnalysis]: Checked inductivity of 2583 backedges. 1722 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:24,624 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:06:27,022 INFO L134 CoverageAnalysis]: Checked inductivity of 2583 backedges. 1722 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:27,042 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:06:27,042 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 169 [2018-12-03 18:06:27,042 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:06:27,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 170 states [2018-12-03 18:06:27,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2018-12-03 18:06:27,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5587, Invalid=23143, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 18:06:27,044 INFO L87 Difference]: Start difference. First operand 129 states and 130 transitions. Second operand 170 states. [2018-12-03 18:06:31,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:31,408 INFO L93 Difference]: Finished difference Result 217 states and 219 transitions. [2018-12-03 18:06:31,408 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-03 18:06:31,408 INFO L78 Accepts]: Start accepts. Automaton has 170 states. Word has length 128 [2018-12-03 18:06:31,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:31,409 INFO L225 Difference]: With dead ends: 217 [2018-12-03 18:06:31,409 INFO L226 Difference]: Without dead ends: 130 [2018-12-03 18:06:31,411 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 88 SyntacticMatches, 83 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24110 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=8422, Invalid=36310, Unknown=0, NotChecked=0, Total=44732 [2018-12-03 18:06:31,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-12-03 18:06:31,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2018-12-03 18:06:31,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-12-03 18:06:31,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-12-03 18:06:31,461 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 128 [2018-12-03 18:06:31,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:31,462 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-12-03 18:06:31,462 INFO L481 AbstractCegarLoop]: Interpolant automaton has 170 states. [2018-12-03 18:06:31,462 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-12-03 18:06:31,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-12-03 18:06:31,462 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:31,463 INFO L402 BasicCegarLoop]: trace histogram [42, 42, 41, 1, 1, 1, 1] [2018-12-03 18:06:31,463 INFO L423 AbstractCegarLoop]: === Iteration 84 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:31,463 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:31,463 INFO L82 PathProgramCache]: Analyzing trace with hash -1684219343, now seen corresponding path program 82 times [2018-12-03 18:06:31,463 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:31,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:31,464 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:06:31,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:31,464 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:31,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:32,399 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 903 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:32,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:32,400 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:32,400 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:32,400 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:32,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:32,400 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:32,410 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:06:32,410 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:06:32,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:32,511 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:06:32,583 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 903 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:32,584 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:06:33,920 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 903 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:33,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:06:33,940 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45, 45] total 47 [2018-12-03 18:06:33,940 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:06:33,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-12-03 18:06:33,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-12-03 18:06:33,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1040, Invalid=1216, Unknown=0, NotChecked=0, Total=2256 [2018-12-03 18:06:33,941 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 48 states. [2018-12-03 18:06:34,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:34,923 INFO L93 Difference]: Finished difference Result 138 states and 139 transitions. [2018-12-03 18:06:34,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 18:06:34,923 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 129 [2018-12-03 18:06:34,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:34,924 INFO L225 Difference]: With dead ends: 138 [2018-12-03 18:06:34,924 INFO L226 Difference]: Without dead ends: 136 [2018-12-03 18:06:34,925 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 213 SyntacticMatches, 84 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3740 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3062, Invalid=5128, Unknown=0, NotChecked=0, Total=8190 [2018-12-03 18:06:34,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-12-03 18:06:34,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 132. [2018-12-03 18:06:34,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-12-03 18:06:34,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2018-12-03 18:06:34,965 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 129 [2018-12-03 18:06:34,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:34,966 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2018-12-03 18:06:34,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-12-03 18:06:34,966 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2018-12-03 18:06:34,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-12-03 18:06:34,966 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:34,967 INFO L402 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1] [2018-12-03 18:06:34,967 INFO L423 AbstractCegarLoop]: === Iteration 85 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:34,967 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:34,967 INFO L82 PathProgramCache]: Analyzing trace with hash 667934283, now seen corresponding path program 83 times [2018-12-03 18:06:34,967 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:34,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:34,968 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:06:34,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:34,968 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:35,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:37,775 INFO L134 CoverageAnalysis]: Checked inductivity of 2709 backedges. 1806 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:37,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:37,775 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:37,775 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:37,775 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:37,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:37,775 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:37,784 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:06:37,784 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:06:37,960 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2018-12-03 18:06:37,960 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:06:37,968 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:06:42,974 INFO L134 CoverageAnalysis]: Checked inductivity of 2709 backedges. 1806 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:42,974 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:06:45,289 INFO L134 CoverageAnalysis]: Checked inductivity of 2709 backedges. 1806 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:45,309 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:06:45,309 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 173 [2018-12-03 18:06:45,309 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:06:45,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 174 states [2018-12-03 18:06:45,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 174 interpolants. [2018-12-03 18:06:45,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5849, Invalid=24253, Unknown=0, NotChecked=0, Total=30102 [2018-12-03 18:06:45,311 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand 174 states. [2018-12-03 18:06:50,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:50,706 INFO L93 Difference]: Finished difference Result 222 states and 224 transitions. [2018-12-03 18:06:50,706 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2018-12-03 18:06:50,706 INFO L78 Accepts]: Start accepts. Automaton has 174 states. Word has length 131 [2018-12-03 18:06:50,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:50,707 INFO L225 Difference]: With dead ends: 222 [2018-12-03 18:06:50,707 INFO L226 Difference]: Without dead ends: 133 [2018-12-03 18:06:50,709 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 90 SyntacticMatches, 85 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25286 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=8816, Invalid=38056, Unknown=0, NotChecked=0, Total=46872 [2018-12-03 18:06:50,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-12-03 18:06:50,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2018-12-03 18:06:50,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-12-03 18:06:50,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2018-12-03 18:06:50,751 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 131 [2018-12-03 18:06:50,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:50,751 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2018-12-03 18:06:50,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has 174 states. [2018-12-03 18:06:50,751 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2018-12-03 18:06:50,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-12-03 18:06:50,752 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:50,752 INFO L402 BasicCegarLoop]: trace histogram [43, 43, 42, 1, 1, 1, 1] [2018-12-03 18:06:50,753 INFO L423 AbstractCegarLoop]: === Iteration 86 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:50,753 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:50,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1201796172, now seen corresponding path program 84 times [2018-12-03 18:06:50,753 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:50,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:50,754 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:06:50,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:50,754 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:50,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:51,941 INFO L134 CoverageAnalysis]: Checked inductivity of 2752 backedges. 946 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:51,941 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:51,942 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:51,942 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:51,942 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:51,942 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:51,942 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:51,952 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:06:51,952 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:06:52,057 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:06:52,058 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:06:52,063 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:06:52,114 INFO L134 CoverageAnalysis]: Checked inductivity of 2752 backedges. 946 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:52,114 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:06:53,517 INFO L134 CoverageAnalysis]: Checked inductivity of 2752 backedges. 946 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:53,537 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:06:53,538 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 48 [2018-12-03 18:06:53,538 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:06:53,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-12-03 18:06:53,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-12-03 18:06:53,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1086, Invalid=1266, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 18:06:53,539 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand 49 states. [2018-12-03 18:06:54,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:54,565 INFO L93 Difference]: Finished difference Result 141 states and 142 transitions. [2018-12-03 18:06:54,565 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 18:06:54,565 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 132 [2018-12-03 18:06:54,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:54,566 INFO L225 Difference]: With dead ends: 141 [2018-12-03 18:06:54,566 INFO L226 Difference]: Without dead ends: 139 [2018-12-03 18:06:54,568 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 218 SyntacticMatches, 86 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3915 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3199, Invalid=5357, Unknown=0, NotChecked=0, Total=8556 [2018-12-03 18:06:54,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-12-03 18:06:54,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 135. [2018-12-03 18:06:54,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-12-03 18:06:54,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2018-12-03 18:06:54,609 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 132 [2018-12-03 18:06:54,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:54,610 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2018-12-03 18:06:54,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-12-03 18:06:54,610 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2018-12-03 18:06:54,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-12-03 18:06:54,611 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:54,611 INFO L402 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1] [2018-12-03 18:06:54,611 INFO L423 AbstractCegarLoop]: === Iteration 87 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:54,611 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:54,611 INFO L82 PathProgramCache]: Analyzing trace with hash 420133646, now seen corresponding path program 85 times [2018-12-03 18:06:54,611 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:54,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:54,612 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:06:54,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:54,612 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:54,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:57,388 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1892 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:57,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:57,389 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:57,389 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:57,389 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:57,390 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:57,390 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:57,401 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:06:57,401 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:06:57,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:57,531 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:02,958 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1892 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:02,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:05,398 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1892 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:05,419 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:05,419 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 177 [2018-12-03 18:07:05,420 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:05,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 178 states [2018-12-03 18:07:05,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2018-12-03 18:07:05,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6117, Invalid=25389, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 18:07:05,422 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand 178 states. [2018-12-03 18:07:09,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:09,838 INFO L93 Difference]: Finished difference Result 227 states and 229 transitions. [2018-12-03 18:07:09,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2018-12-03 18:07:09,838 INFO L78 Accepts]: Start accepts. Automaton has 178 states. Word has length 134 [2018-12-03 18:07:09,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:09,838 INFO L225 Difference]: With dead ends: 227 [2018-12-03 18:07:09,839 INFO L226 Difference]: Without dead ends: 136 [2018-12-03 18:07:09,840 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 92 SyntacticMatches, 87 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26490 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=9219, Invalid=39843, Unknown=0, NotChecked=0, Total=49062 [2018-12-03 18:07:09,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-12-03 18:07:09,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2018-12-03 18:07:09,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-12-03 18:07:09,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2018-12-03 18:07:09,883 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 134 [2018-12-03 18:07:09,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:09,883 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2018-12-03 18:07:09,883 INFO L481 AbstractCegarLoop]: Interpolant automaton has 178 states. [2018-12-03 18:07:09,883 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2018-12-03 18:07:09,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-12-03 18:07:09,884 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:09,884 INFO L402 BasicCegarLoop]: trace histogram [44, 44, 43, 1, 1, 1, 1] [2018-12-03 18:07:09,884 INFO L423 AbstractCegarLoop]: === Iteration 88 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:09,885 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:09,885 INFO L82 PathProgramCache]: Analyzing trace with hash 711010565, now seen corresponding path program 86 times [2018-12-03 18:07:09,885 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:09,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:09,886 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:09,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:09,886 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:09,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:10,833 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 990 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:10,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:10,833 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:10,833 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:10,834 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:10,834 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:10,834 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:10,842 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:07:10,842 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:07:11,043 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2018-12-03 18:07:11,044 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:11,050 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:11,113 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 990 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:11,113 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:12,836 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 990 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:12,875 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:12,875 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 47] total 49 [2018-12-03 18:07:12,875 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:12,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 18:07:12,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 18:07:12,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1133, Invalid=1317, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:07:12,876 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand 50 states. [2018-12-03 18:07:14,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:14,028 INFO L93 Difference]: Finished difference Result 144 states and 145 transitions. [2018-12-03 18:07:14,028 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 18:07:14,028 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 135 [2018-12-03 18:07:14,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:14,029 INFO L225 Difference]: With dead ends: 144 [2018-12-03 18:07:14,029 INFO L226 Difference]: Without dead ends: 142 [2018-12-03 18:07:14,031 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 223 SyntacticMatches, 88 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4094 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3339, Invalid=5591, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 18:07:14,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-12-03 18:07:14,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 138. [2018-12-03 18:07:14,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-12-03 18:07:14,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 139 transitions. [2018-12-03 18:07:14,079 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 139 transitions. Word has length 135 [2018-12-03 18:07:14,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:14,079 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 139 transitions. [2018-12-03 18:07:14,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 18:07:14,080 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 139 transitions. [2018-12-03 18:07:14,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-12-03 18:07:14,080 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:14,080 INFO L402 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1] [2018-12-03 18:07:14,080 INFO L423 AbstractCegarLoop]: === Iteration 89 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:14,081 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:14,081 INFO L82 PathProgramCache]: Analyzing trace with hash 381405215, now seen corresponding path program 87 times [2018-12-03 18:07:14,081 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:14,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:14,081 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:14,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:14,082 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:14,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:16,700 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 1980 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:16,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:16,700 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:16,701 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:16,701 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:16,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:16,701 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:16,711 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:07:16,711 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:07:16,822 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:07:16,822 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:16,830 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:22,529 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 1980 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:22,529 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:25,102 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 1980 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:25,123 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:25,123 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 181 [2018-12-03 18:07:25,124 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:25,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 182 states [2018-12-03 18:07:25,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 182 interpolants. [2018-12-03 18:07:25,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6391, Invalid=26551, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 18:07:25,127 INFO L87 Difference]: Start difference. First operand 138 states and 139 transitions. Second operand 182 states. [2018-12-03 18:07:29,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:29,269 INFO L93 Difference]: Finished difference Result 232 states and 234 transitions. [2018-12-03 18:07:29,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2018-12-03 18:07:29,269 INFO L78 Accepts]: Start accepts. Automaton has 182 states. Word has length 137 [2018-12-03 18:07:29,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:29,270 INFO L225 Difference]: With dead ends: 232 [2018-12-03 18:07:29,270 INFO L226 Difference]: Without dead ends: 139 [2018-12-03 18:07:29,272 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 94 SyntacticMatches, 89 SemanticMatches, 225 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27722 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=9631, Invalid=41671, Unknown=0, NotChecked=0, Total=51302 [2018-12-03 18:07:29,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-12-03 18:07:29,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-12-03 18:07:29,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-12-03 18:07:29,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2018-12-03 18:07:29,321 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 137 [2018-12-03 18:07:29,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:29,321 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2018-12-03 18:07:29,321 INFO L481 AbstractCegarLoop]: Interpolant automaton has 182 states. [2018-12-03 18:07:29,321 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2018-12-03 18:07:29,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2018-12-03 18:07:29,322 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:29,322 INFO L402 BasicCegarLoop]: trace histogram [45, 45, 44, 1, 1, 1, 1] [2018-12-03 18:07:29,322 INFO L423 AbstractCegarLoop]: === Iteration 90 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:29,322 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:29,322 INFO L82 PathProgramCache]: Analyzing trace with hash -1348304184, now seen corresponding path program 88 times [2018-12-03 18:07:29,322 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:29,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:29,323 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:29,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:29,323 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:29,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:30,274 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1035 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:30,274 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:30,274 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:30,274 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:30,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:30,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:30,275 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:30,283 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:30,283 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:07:30,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:30,393 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:30,461 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1035 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:30,462 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:31,998 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1035 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:32,018 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:32,018 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 50 [2018-12-03 18:07:32,018 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:32,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-12-03 18:07:32,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-12-03 18:07:32,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1181, Invalid=1369, Unknown=0, NotChecked=0, Total=2550 [2018-12-03 18:07:32,019 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand 51 states. [2018-12-03 18:07:33,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:33,341 INFO L93 Difference]: Finished difference Result 147 states and 148 transitions. [2018-12-03 18:07:33,342 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 18:07:33,342 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 138 [2018-12-03 18:07:33,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:33,343 INFO L225 Difference]: With dead ends: 147 [2018-12-03 18:07:33,343 INFO L226 Difference]: Without dead ends: 145 [2018-12-03 18:07:33,344 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 228 SyntacticMatches, 90 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4277 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3482, Invalid=5830, Unknown=0, NotChecked=0, Total=9312 [2018-12-03 18:07:33,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-12-03 18:07:33,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 141. [2018-12-03 18:07:33,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-12-03 18:07:33,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 142 transitions. [2018-12-03 18:07:33,395 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 142 transitions. Word has length 138 [2018-12-03 18:07:33,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:33,396 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 142 transitions. [2018-12-03 18:07:33,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-12-03 18:07:33,396 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 142 transitions. [2018-12-03 18:07:33,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-12-03 18:07:33,396 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:33,397 INFO L402 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1] [2018-12-03 18:07:33,397 INFO L423 AbstractCegarLoop]: === Iteration 91 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:33,397 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:33,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1359854882, now seen corresponding path program 89 times [2018-12-03 18:07:33,397 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:33,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:33,398 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:33,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:33,398 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:33,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:36,209 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 2070 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:36,209 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:36,209 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:36,209 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:36,209 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:36,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:36,210 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:36,218 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:07:36,218 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:07:36,422 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2018-12-03 18:07:36,422 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:36,428 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:42,151 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 2070 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:42,151 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:44,989 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 2070 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:45,009 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:45,010 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 185 [2018-12-03 18:07:45,010 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:45,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 186 states [2018-12-03 18:07:45,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 186 interpolants. [2018-12-03 18:07:45,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6671, Invalid=27739, Unknown=0, NotChecked=0, Total=34410 [2018-12-03 18:07:45,012 INFO L87 Difference]: Start difference. First operand 141 states and 142 transitions. Second operand 186 states. [2018-12-03 18:07:49,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:49,646 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2018-12-03 18:07:49,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2018-12-03 18:07:49,646 INFO L78 Accepts]: Start accepts. Automaton has 186 states. Word has length 140 [2018-12-03 18:07:49,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:49,647 INFO L225 Difference]: With dead ends: 237 [2018-12-03 18:07:49,647 INFO L226 Difference]: Without dead ends: 142 [2018-12-03 18:07:49,650 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 96 SyntacticMatches, 91 SemanticMatches, 230 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28982 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=10052, Invalid=43540, Unknown=0, NotChecked=0, Total=53592 [2018-12-03 18:07:49,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-12-03 18:07:49,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-12-03 18:07:49,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-12-03 18:07:49,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2018-12-03 18:07:49,691 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 140 [2018-12-03 18:07:49,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:49,691 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2018-12-03 18:07:49,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has 186 states. [2018-12-03 18:07:49,692 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2018-12-03 18:07:49,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-12-03 18:07:49,692 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:49,692 INFO L402 BasicCegarLoop]: trace histogram [46, 46, 45, 1, 1, 1, 1] [2018-12-03 18:07:49,692 INFO L423 AbstractCegarLoop]: === Iteration 92 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:49,693 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:49,693 INFO L82 PathProgramCache]: Analyzing trace with hash -1690200615, now seen corresponding path program 90 times [2018-12-03 18:07:49,693 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:49,693 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:49,693 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:49,693 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:49,693 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:49,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:50,741 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1081 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:50,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:50,741 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:50,741 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:50,741 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:50,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:50,741 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:50,751 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:07:50,751 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:07:50,868 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:07:50,868 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:50,876 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:50,949 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1081 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:50,949 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:52,555 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1081 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:52,574 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:52,575 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49, 49] total 51 [2018-12-03 18:07:52,575 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:52,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-12-03 18:07:52,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-12-03 18:07:52,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1230, Invalid=1422, Unknown=0, NotChecked=0, Total=2652 [2018-12-03 18:07:52,576 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand 52 states. [2018-12-03 18:07:54,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:54,017 INFO L93 Difference]: Finished difference Result 150 states and 151 transitions. [2018-12-03 18:07:54,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-12-03 18:07:54,018 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 141 [2018-12-03 18:07:54,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:54,018 INFO L225 Difference]: With dead ends: 150 [2018-12-03 18:07:54,018 INFO L226 Difference]: Without dead ends: 148 [2018-12-03 18:07:54,020 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 233 SyntacticMatches, 92 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4464 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=3628, Invalid=6074, Unknown=0, NotChecked=0, Total=9702 [2018-12-03 18:07:54,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-12-03 18:07:54,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 144. [2018-12-03 18:07:54,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-12-03 18:07:54,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 145 transitions. [2018-12-03 18:07:54,065 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 145 transitions. Word has length 141 [2018-12-03 18:07:54,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:54,066 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 145 transitions. [2018-12-03 18:07:54,066 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-12-03 18:07:54,066 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 145 transitions. [2018-12-03 18:07:54,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-12-03 18:07:54,066 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:54,066 INFO L402 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1] [2018-12-03 18:07:54,067 INFO L423 AbstractCegarLoop]: === Iteration 93 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:54,067 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:54,067 INFO L82 PathProgramCache]: Analyzing trace with hash -785100813, now seen corresponding path program 91 times [2018-12-03 18:07:54,067 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:54,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:54,068 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:54,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:54,068 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:54,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:57,061 INFO L134 CoverageAnalysis]: Checked inductivity of 3243 backedges. 2162 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:57,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:57,061 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:57,061 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:57,061 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:57,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:57,062 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:57,070 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:57,071 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:07:57,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:57,182 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:03,125 INFO L134 CoverageAnalysis]: Checked inductivity of 3243 backedges. 2162 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:03,125 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:06,072 INFO L134 CoverageAnalysis]: Checked inductivity of 3243 backedges. 2162 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:06,092 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:06,092 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 189 [2018-12-03 18:08:06,092 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:06,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 190 states [2018-12-03 18:08:06,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2018-12-03 18:08:06,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6957, Invalid=28953, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 18:08:06,094 INFO L87 Difference]: Start difference. First operand 144 states and 145 transitions. Second operand 190 states. [2018-12-03 18:08:12,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:12,672 INFO L93 Difference]: Finished difference Result 242 states and 244 transitions. [2018-12-03 18:08:12,672 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2018-12-03 18:08:12,672 INFO L78 Accepts]: Start accepts. Automaton has 190 states. Word has length 143 [2018-12-03 18:08:12,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:12,673 INFO L225 Difference]: With dead ends: 242 [2018-12-03 18:08:12,673 INFO L226 Difference]: Without dead ends: 145 [2018-12-03 18:08:12,675 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 98 SyntacticMatches, 93 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30270 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=10482, Invalid=45450, Unknown=0, NotChecked=0, Total=55932 [2018-12-03 18:08:12,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-12-03 18:08:12,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 145. [2018-12-03 18:08:12,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2018-12-03 18:08:12,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 146 transitions. [2018-12-03 18:08:12,722 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 146 transitions. Word has length 143 [2018-12-03 18:08:12,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:12,722 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 146 transitions. [2018-12-03 18:08:12,722 INFO L481 AbstractCegarLoop]: Interpolant automaton has 190 states. [2018-12-03 18:08:12,722 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 146 transitions. [2018-12-03 18:08:12,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2018-12-03 18:08:12,722 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:12,723 INFO L402 BasicCegarLoop]: trace histogram [47, 47, 46, 1, 1, 1, 1] [2018-12-03 18:08:12,723 INFO L423 AbstractCegarLoop]: === Iteration 94 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:12,723 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:12,723 INFO L82 PathProgramCache]: Analyzing trace with hash -660297764, now seen corresponding path program 92 times [2018-12-03 18:08:12,723 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:12,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:12,724 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:08:12,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:12,724 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:12,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:13,980 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1128 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:13,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:13,981 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:13,981 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:13,981 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:13,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:13,981 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:13,989 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:08:13,990 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:08:14,198 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2018-12-03 18:08:14,198 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:08:14,203 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:14,285 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1128 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:14,286 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:15,882 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1128 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:15,902 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:15,903 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 52 [2018-12-03 18:08:15,903 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:15,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 18:08:15,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 18:08:15,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1280, Invalid=1476, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 18:08:15,904 INFO L87 Difference]: Start difference. First operand 145 states and 146 transitions. Second operand 53 states. [2018-12-03 18:08:17,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:17,160 INFO L93 Difference]: Finished difference Result 153 states and 154 transitions. [2018-12-03 18:08:17,160 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 18:08:17,160 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 144 [2018-12-03 18:08:17,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:17,161 INFO L225 Difference]: With dead ends: 153 [2018-12-03 18:08:17,161 INFO L226 Difference]: Without dead ends: 151 [2018-12-03 18:08:17,162 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 431 GetRequests, 238 SyntacticMatches, 94 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4655 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3777, Invalid=6323, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 18:08:17,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-12-03 18:08:17,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 147. [2018-12-03 18:08:17,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-12-03 18:08:17,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2018-12-03 18:08:17,212 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 144 [2018-12-03 18:08:17,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:17,212 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2018-12-03 18:08:17,212 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 18:08:17,212 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2018-12-03 18:08:17,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-12-03 18:08:17,212 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:17,213 INFO L402 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1] [2018-12-03 18:08:17,213 INFO L423 AbstractCegarLoop]: === Iteration 95 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:17,213 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:17,213 INFO L82 PathProgramCache]: Analyzing trace with hash 1109060918, now seen corresponding path program 93 times [2018-12-03 18:08:17,213 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:17,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:17,214 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:08:17,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:17,214 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:17,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:20,413 INFO L134 CoverageAnalysis]: Checked inductivity of 3384 backedges. 2256 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:20,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:20,413 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:20,413 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:20,413 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:20,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:20,413 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:20,424 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:08:20,425 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:08:20,540 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:08:20,540 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:08:20,549 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:26,859 INFO L134 CoverageAnalysis]: Checked inductivity of 3384 backedges. 2256 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:26,859 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:30,049 INFO L134 CoverageAnalysis]: Checked inductivity of 3384 backedges. 2256 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:30,069 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:30,069 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 193 [2018-12-03 18:08:30,069 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:30,070 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2018-12-03 18:08:30,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2018-12-03 18:08:30,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7249, Invalid=30193, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 18:08:30,072 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand 194 states. [2018-12-03 18:08:35,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:35,826 INFO L93 Difference]: Finished difference Result 247 states and 249 transitions. [2018-12-03 18:08:35,827 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2018-12-03 18:08:35,827 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 146 [2018-12-03 18:08:35,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:35,827 INFO L225 Difference]: With dead ends: 247 [2018-12-03 18:08:35,827 INFO L226 Difference]: Without dead ends: 148 [2018-12-03 18:08:35,829 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 100 SyntacticMatches, 95 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31586 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=10921, Invalid=47401, Unknown=0, NotChecked=0, Total=58322 [2018-12-03 18:08:35,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-12-03 18:08:35,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2018-12-03 18:08:35,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-12-03 18:08:35,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2018-12-03 18:08:35,874 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 146 [2018-12-03 18:08:35,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:35,874 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2018-12-03 18:08:35,874 INFO L481 AbstractCegarLoop]: Interpolant automaton has 194 states. [2018-12-03 18:08:35,874 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2018-12-03 18:08:35,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-12-03 18:08:35,874 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:35,875 INFO L402 BasicCegarLoop]: trace histogram [48, 48, 47, 1, 1, 1, 1] [2018-12-03 18:08:35,875 INFO L423 AbstractCegarLoop]: === Iteration 96 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:35,875 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:35,875 INFO L82 PathProgramCache]: Analyzing trace with hash -324984659, now seen corresponding path program 94 times [2018-12-03 18:08:35,875 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:35,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:35,876 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:08:35,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:35,876 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:35,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:37,008 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1176 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:37,008 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:37,008 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:37,008 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:37,008 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:37,008 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:37,008 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:37,017 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:08:37,017 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:08:37,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:37,135 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:37,204 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1176 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:37,204 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:38,898 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1176 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:38,919 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:38,919 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51, 51] total 53 [2018-12-03 18:08:38,919 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:38,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-12-03 18:08:38,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-12-03 18:08:38,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1331, Invalid=1531, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 18:08:38,920 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand 54 states. [2018-12-03 18:08:40,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:40,367 INFO L93 Difference]: Finished difference Result 156 states and 157 transitions. [2018-12-03 18:08:40,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2018-12-03 18:08:40,368 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 147 [2018-12-03 18:08:40,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:40,369 INFO L225 Difference]: With dead ends: 156 [2018-12-03 18:08:40,369 INFO L226 Difference]: Without dead ends: 154 [2018-12-03 18:08:40,370 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 243 SyntacticMatches, 96 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4850 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3929, Invalid=6577, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 18:08:40,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-12-03 18:08:40,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 150. [2018-12-03 18:08:40,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-12-03 18:08:40,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2018-12-03 18:08:40,422 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 147 [2018-12-03 18:08:40,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:40,423 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2018-12-03 18:08:40,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-12-03 18:08:40,423 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2018-12-03 18:08:40,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-12-03 18:08:40,424 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:40,424 INFO L402 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1] [2018-12-03 18:08:40,424 INFO L423 AbstractCegarLoop]: === Iteration 97 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:40,424 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:40,424 INFO L82 PathProgramCache]: Analyzing trace with hash 1222407623, now seen corresponding path program 95 times [2018-12-03 18:08:40,424 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:40,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:40,425 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:08:40,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:40,425 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:40,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:43,521 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 2352 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:43,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:43,522 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:43,522 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:43,522 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:43,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:43,522 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:43,533 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:08:43,533 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:08:43,758 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2018-12-03 18:08:43,759 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:08:43,765 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:50,493 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 2352 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:50,493 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:53,479 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 2352 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:53,499 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:53,500 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 197 [2018-12-03 18:08:53,500 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:53,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 198 states [2018-12-03 18:08:53,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 198 interpolants. [2018-12-03 18:08:53,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7547, Invalid=31459, Unknown=0, NotChecked=0, Total=39006 [2018-12-03 18:08:53,502 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand 198 states. [2018-12-03 18:08:59,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:59,693 INFO L93 Difference]: Finished difference Result 252 states and 254 transitions. [2018-12-03 18:08:59,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-12-03 18:08:59,693 INFO L78 Accepts]: Start accepts. Automaton has 198 states. Word has length 149 [2018-12-03 18:08:59,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:59,694 INFO L225 Difference]: With dead ends: 252 [2018-12-03 18:08:59,694 INFO L226 Difference]: Without dead ends: 151 [2018-12-03 18:08:59,696 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 102 SyntacticMatches, 97 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32930 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=11369, Invalid=49393, Unknown=0, NotChecked=0, Total=60762 [2018-12-03 18:08:59,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-12-03 18:08:59,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-12-03 18:08:59,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-12-03 18:08:59,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2018-12-03 18:08:59,755 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 149 [2018-12-03 18:08:59,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:59,756 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2018-12-03 18:08:59,756 INFO L481 AbstractCegarLoop]: Interpolant automaton has 198 states. [2018-12-03 18:08:59,756 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2018-12-03 18:08:59,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-12-03 18:08:59,757 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:59,757 INFO L402 BasicCegarLoop]: trace histogram [49, 49, 48, 1, 1, 1, 1] [2018-12-03 18:08:59,757 INFO L423 AbstractCegarLoop]: === Iteration 98 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:59,757 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:59,757 INFO L82 PathProgramCache]: Analyzing trace with hash 1610316528, now seen corresponding path program 96 times [2018-12-03 18:08:59,757 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:59,758 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:59,758 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:08:59,758 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:59,758 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:59,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:00,888 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 1225 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:00,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:00,888 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:00,888 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:00,889 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:00,889 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:00,889 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:00,898 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:09:00,898 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:09:01,021 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:09:01,022 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:09:01,030 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:09:01,108 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 1225 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:01,109 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:09:02,905 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 1225 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:02,925 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:09:02,925 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52, 52] total 54 [2018-12-03 18:09:02,925 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:09:02,925 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 18:09:02,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 18:09:02,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1383, Invalid=1587, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 18:09:02,926 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand 55 states. [2018-12-03 18:09:04,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:09:04,213 INFO L93 Difference]: Finished difference Result 159 states and 160 transitions. [2018-12-03 18:09:04,213 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2018-12-03 18:09:04,213 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 150 [2018-12-03 18:09:04,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:09:04,214 INFO L225 Difference]: With dead ends: 159 [2018-12-03 18:09:04,214 INFO L226 Difference]: Without dead ends: 157 [2018-12-03 18:09:04,215 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 248 SyntacticMatches, 98 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5049 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=4084, Invalid=6836, Unknown=0, NotChecked=0, Total=10920 [2018-12-03 18:09:04,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-12-03 18:09:04,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 153. [2018-12-03 18:09:04,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-12-03 18:09:04,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 154 transitions. [2018-12-03 18:09:04,292 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 154 transitions. Word has length 150 [2018-12-03 18:09:04,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:09:04,292 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 154 transitions. [2018-12-03 18:09:04,292 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 18:09:04,292 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 154 transitions. [2018-12-03 18:09:04,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-12-03 18:09:04,293 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:09:04,293 INFO L402 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1] [2018-12-03 18:09:04,293 INFO L423 AbstractCegarLoop]: === Iteration 99 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:09:04,293 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:09:04,293 INFO L82 PathProgramCache]: Analyzing trace with hash 1326009162, now seen corresponding path program 97 times [2018-12-03 18:09:04,293 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:09:04,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:04,294 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:09:04,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:04,294 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:09:04,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:07,657 INFO L134 CoverageAnalysis]: Checked inductivity of 3675 backedges. 2450 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:07,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:07,658 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:07,658 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:07,658 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:07,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:07,658 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:07,667 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:09:07,667 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:09:07,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:07,790 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:09:14,575 INFO L134 CoverageAnalysis]: Checked inductivity of 3675 backedges. 2450 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:14,575 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:09:17,781 INFO L134 CoverageAnalysis]: Checked inductivity of 3675 backedges. 2450 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:17,800 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:09:17,801 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 201 [2018-12-03 18:09:17,801 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:09:17,801 INFO L459 AbstractCegarLoop]: Interpolant automaton has 202 states [2018-12-03 18:09:17,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 202 interpolants. [2018-12-03 18:09:17,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7851, Invalid=32751, Unknown=0, NotChecked=0, Total=40602 [2018-12-03 18:09:17,803 INFO L87 Difference]: Start difference. First operand 153 states and 154 transitions. Second operand 202 states. [2018-12-03 18:09:25,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:09:25,542 INFO L93 Difference]: Finished difference Result 257 states and 259 transitions. [2018-12-03 18:09:25,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2018-12-03 18:09:25,543 INFO L78 Accepts]: Start accepts. Automaton has 202 states. Word has length 152 [2018-12-03 18:09:25,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:09:25,543 INFO L225 Difference]: With dead ends: 257 [2018-12-03 18:09:25,543 INFO L226 Difference]: Without dead ends: 154 [2018-12-03 18:09:25,545 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 104 SyntacticMatches, 99 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34302 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=11826, Invalid=51426, Unknown=0, NotChecked=0, Total=63252 [2018-12-03 18:09:25,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-12-03 18:09:25,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 154. [2018-12-03 18:09:25,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-12-03 18:09:25,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2018-12-03 18:09:25,598 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 152 [2018-12-03 18:09:25,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:09:25,598 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2018-12-03 18:09:25,598 INFO L481 AbstractCegarLoop]: Interpolant automaton has 202 states. [2018-12-03 18:09:25,599 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2018-12-03 18:09:25,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-12-03 18:09:25,599 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:09:25,599 INFO L402 BasicCegarLoop]: trace histogram [50, 50, 49, 1, 1, 1, 1] [2018-12-03 18:09:25,599 INFO L423 AbstractCegarLoop]: === Iteration 100 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:09:25,600 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:09:25,600 INFO L82 PathProgramCache]: Analyzing trace with hash -236795519, now seen corresponding path program 98 times [2018-12-03 18:09:25,600 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:09:25,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:25,600 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:09:25,601 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:25,601 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:09:25,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:26,881 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1275 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:26,881 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:26,881 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:26,881 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:26,881 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:26,881 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:26,881 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:26,915 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:09:26,916 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:09:27,160 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-12-03 18:09:27,160 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:09:27,168 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:09:27,238 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1275 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:27,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:09:29,091 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1275 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:29,111 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:09:29,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 53] total 55 [2018-12-03 18:09:29,112 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:09:29,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-12-03 18:09:29,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-12-03 18:09:29,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1436, Invalid=1644, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 18:09:29,113 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand 56 states. [2018-12-03 18:09:30,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:09:30,725 INFO L93 Difference]: Finished difference Result 162 states and 163 transitions. [2018-12-03 18:09:30,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2018-12-03 18:09:30,726 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 153 [2018-12-03 18:09:30,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:09:30,726 INFO L225 Difference]: With dead ends: 162 [2018-12-03 18:09:30,727 INFO L226 Difference]: Without dead ends: 160 [2018-12-03 18:09:30,728 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 253 SyntacticMatches, 100 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5252 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=4242, Invalid=7100, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 18:09:30,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-03 18:09:30,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 156. [2018-12-03 18:09:30,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-12-03 18:09:30,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 157 transitions. [2018-12-03 18:09:30,783 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 157 transitions. Word has length 153 [2018-12-03 18:09:30,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:09:30,784 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 157 transitions. [2018-12-03 18:09:30,784 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-12-03 18:09:30,784 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 157 transitions. [2018-12-03 18:09:30,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-12-03 18:09:30,784 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:09:30,785 INFO L402 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1] [2018-12-03 18:09:30,785 INFO L423 AbstractCegarLoop]: === Iteration 101 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:09:30,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:09:30,785 INFO L82 PathProgramCache]: Analyzing trace with hash 72825243, now seen corresponding path program 99 times [2018-12-03 18:09:30,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:09:30,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:30,786 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:09:30,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:30,786 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:09:30,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:34,227 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 2550 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:34,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:34,228 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:34,228 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:34,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:34,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:34,228 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:34,239 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:09:34,239 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:09:34,358 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:09:34,358 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:09:34,365 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:09:41,554 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 2550 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:41,554 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:09:44,798 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 2550 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:44,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:09:44,818 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 103, 103] total 205 [2018-12-03 18:09:44,818 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:09:44,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 206 states [2018-12-03 18:09:44,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 206 interpolants. [2018-12-03 18:09:44,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8161, Invalid=34069, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 18:09:44,821 INFO L87 Difference]: Start difference. First operand 156 states and 157 transitions. Second operand 206 states. [2018-12-03 18:09:49,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:09:49,317 INFO L93 Difference]: Finished difference Result 262 states and 264 transitions. [2018-12-03 18:09:49,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2018-12-03 18:09:49,317 INFO L78 Accepts]: Start accepts. Automaton has 206 states. Word has length 155 [2018-12-03 18:09:49,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:09:49,318 INFO L225 Difference]: With dead ends: 262 [2018-12-03 18:09:49,318 INFO L226 Difference]: Without dead ends: 157 [2018-12-03 18:09:49,321 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 106 SyntacticMatches, 101 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35702 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=12292, Invalid=53500, Unknown=0, NotChecked=0, Total=65792 [2018-12-03 18:09:49,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-12-03 18:09:49,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2018-12-03 18:09:49,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-12-03 18:09:49,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2018-12-03 18:09:49,374 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 155 [2018-12-03 18:09:49,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:09:49,374 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2018-12-03 18:09:49,374 INFO L481 AbstractCegarLoop]: Interpolant automaton has 206 states. [2018-12-03 18:09:49,374 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2018-12-03 18:09:49,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-12-03 18:09:49,375 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:09:49,375 INFO L402 BasicCegarLoop]: trace histogram [51, 51, 50, 1, 1, 1, 1] [2018-12-03 18:09:49,375 INFO L423 AbstractCegarLoop]: === Iteration 102 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:09:49,376 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:09:49,376 INFO L82 PathProgramCache]: Analyzing trace with hash 4062212, now seen corresponding path program 100 times [2018-12-03 18:09:49,376 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:09:49,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:49,377 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:09:49,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:49,377 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:09:49,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:50,603 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1326 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:50,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:50,604 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:50,604 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:50,604 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:50,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:50,604 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:50,613 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:09:50,613 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:09:50,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:50,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:09:50,868 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1326 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:50,869 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:09:52,856 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1326 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:52,876 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:09:52,876 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 56 [2018-12-03 18:09:52,876 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:09:52,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-12-03 18:09:52,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-12-03 18:09:52,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1490, Invalid=1702, Unknown=0, NotChecked=0, Total=3192 [2018-12-03 18:09:52,878 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand 57 states. [2018-12-03 18:09:54,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:09:54,256 INFO L93 Difference]: Finished difference Result 165 states and 166 transitions. [2018-12-03 18:09:54,257 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2018-12-03 18:09:54,257 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 156 [2018-12-03 18:09:54,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:09:54,258 INFO L225 Difference]: With dead ends: 165 [2018-12-03 18:09:54,258 INFO L226 Difference]: Without dead ends: 163 [2018-12-03 18:09:54,260 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 258 SyntacticMatches, 102 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5459 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=4403, Invalid=7369, Unknown=0, NotChecked=0, Total=11772 [2018-12-03 18:09:54,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-12-03 18:09:54,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 159. [2018-12-03 18:09:54,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-12-03 18:09:54,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2018-12-03 18:09:54,322 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 156 [2018-12-03 18:09:54,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:09:54,322 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2018-12-03 18:09:54,322 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-12-03 18:09:54,322 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2018-12-03 18:09:54,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-12-03 18:09:54,322 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:09:54,323 INFO L402 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1] [2018-12-03 18:09:54,323 INFO L423 AbstractCegarLoop]: === Iteration 103 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:09:54,323 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:09:54,323 INFO L82 PathProgramCache]: Analyzing trace with hash -391129250, now seen corresponding path program 101 times [2018-12-03 18:09:54,323 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:09:54,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:54,324 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:09:54,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:54,324 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:09:54,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:57,958 INFO L134 CoverageAnalysis]: Checked inductivity of 3978 backedges. 2652 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:57,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:57,958 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:57,958 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:57,959 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:57,959 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:57,959 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:57,967 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:09:57,967 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:09:58,214 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2018-12-03 18:09:58,214 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:09:58,221 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:05,365 INFO L134 CoverageAnalysis]: Checked inductivity of 3978 backedges. 2652 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:05,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:08,961 INFO L134 CoverageAnalysis]: Checked inductivity of 3978 backedges. 2652 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:08,981 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:08,981 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 105, 105] total 209 [2018-12-03 18:10:08,981 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:08,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 210 states [2018-12-03 18:10:08,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 210 interpolants. [2018-12-03 18:10:08,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8477, Invalid=35413, Unknown=0, NotChecked=0, Total=43890 [2018-12-03 18:10:08,985 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand 210 states. [2018-12-03 18:10:14,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:14,273 INFO L93 Difference]: Finished difference Result 267 states and 269 transitions. [2018-12-03 18:10:14,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2018-12-03 18:10:14,273 INFO L78 Accepts]: Start accepts. Automaton has 210 states. Word has length 158 [2018-12-03 18:10:14,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:14,274 INFO L225 Difference]: With dead ends: 267 [2018-12-03 18:10:14,274 INFO L226 Difference]: Without dead ends: 160 [2018-12-03 18:10:14,277 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 108 SyntacticMatches, 103 SemanticMatches, 260 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37130 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=12767, Invalid=55615, Unknown=0, NotChecked=0, Total=68382 [2018-12-03 18:10:14,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-03 18:10:14,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-12-03 18:10:14,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-12-03 18:10:14,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2018-12-03 18:10:14,336 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 158 [2018-12-03 18:10:14,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:14,336 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2018-12-03 18:10:14,336 INFO L481 AbstractCegarLoop]: Interpolant automaton has 210 states. [2018-12-03 18:10:14,336 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2018-12-03 18:10:14,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-12-03 18:10:14,337 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:14,337 INFO L402 BasicCegarLoop]: trace histogram [52, 52, 51, 1, 1, 1, 1] [2018-12-03 18:10:14,337 INFO L423 AbstractCegarLoop]: === Iteration 104 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:14,337 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:14,338 INFO L82 PathProgramCache]: Analyzing trace with hash -211185579, now seen corresponding path program 102 times [2018-12-03 18:10:14,338 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:14,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:14,338 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:14,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:14,339 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:14,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:15,649 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1378 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:15,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:15,650 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:15,650 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:15,650 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:15,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:15,650 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:15,659 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:10:15,659 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:10:15,787 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:10:15,787 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:15,794 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:15,872 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1378 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:15,872 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:18,061 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1378 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:18,081 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:18,082 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55, 55] total 57 [2018-12-03 18:10:18,082 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:18,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-12-03 18:10:18,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-12-03 18:10:18,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1545, Invalid=1761, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 18:10:18,083 INFO L87 Difference]: Start difference. First operand 160 states and 161 transitions. Second operand 58 states. [2018-12-03 18:10:19,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:19,505 INFO L93 Difference]: Finished difference Result 168 states and 169 transitions. [2018-12-03 18:10:19,505 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2018-12-03 18:10:19,506 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 159 [2018-12-03 18:10:19,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:19,506 INFO L225 Difference]: With dead ends: 168 [2018-12-03 18:10:19,507 INFO L226 Difference]: Without dead ends: 166 [2018-12-03 18:10:19,508 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 263 SyntacticMatches, 104 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5670 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=4567, Invalid=7643, Unknown=0, NotChecked=0, Total=12210 [2018-12-03 18:10:19,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-03 18:10:19,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 162. [2018-12-03 18:10:19,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-12-03 18:10:19,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 163 transitions. [2018-12-03 18:10:19,574 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 163 transitions. Word has length 159 [2018-12-03 18:10:19,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:19,574 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 163 transitions. [2018-12-03 18:10:19,575 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-12-03 18:10:19,575 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 163 transitions. [2018-12-03 18:10:19,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-12-03 18:10:19,575 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:19,575 INFO L402 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1] [2018-12-03 18:10:19,576 INFO L423 AbstractCegarLoop]: === Iteration 105 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:19,576 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:19,576 INFO L82 PathProgramCache]: Analyzing trace with hash -1085826193, now seen corresponding path program 103 times [2018-12-03 18:10:19,576 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:19,577 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:19,577 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:19,577 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:19,577 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:19,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:23,386 INFO L134 CoverageAnalysis]: Checked inductivity of 4134 backedges. 2756 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:23,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:23,387 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:23,387 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:23,387 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:23,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:23,387 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:23,400 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:23,400 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:10:23,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:23,527 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:30,966 INFO L134 CoverageAnalysis]: Checked inductivity of 4134 backedges. 2756 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:30,966 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:34,687 INFO L134 CoverageAnalysis]: Checked inductivity of 4134 backedges. 2756 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:34,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:34,707 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [107, 107, 107] total 213 [2018-12-03 18:10:34,707 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:34,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 214 states [2018-12-03 18:10:34,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 214 interpolants. [2018-12-03 18:10:34,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8799, Invalid=36783, Unknown=0, NotChecked=0, Total=45582 [2018-12-03 18:10:34,710 INFO L87 Difference]: Start difference. First operand 162 states and 163 transitions. Second operand 214 states. [2018-12-03 18:10:39,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:39,724 INFO L93 Difference]: Finished difference Result 272 states and 274 transitions. [2018-12-03 18:10:39,724 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2018-12-03 18:10:39,724 INFO L78 Accepts]: Start accepts. Automaton has 214 states. Word has length 161 [2018-12-03 18:10:39,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:39,724 INFO L225 Difference]: With dead ends: 272 [2018-12-03 18:10:39,724 INFO L226 Difference]: Without dead ends: 163 [2018-12-03 18:10:39,728 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 110 SyntacticMatches, 105 SemanticMatches, 265 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38586 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=13251, Invalid=57771, Unknown=0, NotChecked=0, Total=71022 [2018-12-03 18:10:39,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-12-03 18:10:39,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2018-12-03 18:10:39,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2018-12-03 18:10:39,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 164 transitions. [2018-12-03 18:10:39,793 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 164 transitions. Word has length 161 [2018-12-03 18:10:39,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:39,793 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 164 transitions. [2018-12-03 18:10:39,793 INFO L481 AbstractCegarLoop]: Interpolant automaton has 214 states. [2018-12-03 18:10:39,793 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 164 transitions. [2018-12-03 18:10:39,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2018-12-03 18:10:39,794 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:39,794 INFO L402 BasicCegarLoop]: trace histogram [53, 53, 52, 1, 1, 1, 1] [2018-12-03 18:10:39,794 INFO L423 AbstractCegarLoop]: === Iteration 106 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:39,794 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:39,794 INFO L82 PathProgramCache]: Analyzing trace with hash -503108840, now seen corresponding path program 104 times [2018-12-03 18:10:39,794 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:39,795 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:39,795 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:39,795 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:39,795 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:39,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:41,119 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1431 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:41,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:41,120 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:41,120 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:41,120 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:41,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:41,120 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:41,130 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:10:41,130 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:10:41,430 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2018-12-03 18:10:41,430 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:41,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:41,532 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1431 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:41,532 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:44,029 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1431 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:44,049 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:44,050 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56, 56] total 58 [2018-12-03 18:10:44,050 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:44,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 18:10:44,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 18:10:44,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1601, Invalid=1821, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 18:10:44,051 INFO L87 Difference]: Start difference. First operand 163 states and 164 transitions. Second operand 59 states. [2018-12-03 18:10:45,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:45,572 INFO L93 Difference]: Finished difference Result 171 states and 172 transitions. [2018-12-03 18:10:45,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-12-03 18:10:45,572 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 162 [2018-12-03 18:10:45,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:45,573 INFO L225 Difference]: With dead ends: 171 [2018-12-03 18:10:45,573 INFO L226 Difference]: Without dead ends: 169 [2018-12-03 18:10:45,574 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 268 SyntacticMatches, 106 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5885 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=4734, Invalid=7922, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 18:10:45,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-12-03 18:10:45,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 165. [2018-12-03 18:10:45,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-12-03 18:10:45,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 166 transitions. [2018-12-03 18:10:45,635 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 166 transitions. Word has length 162 [2018-12-03 18:10:45,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:45,635 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 166 transitions. [2018-12-03 18:10:45,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 18:10:45,635 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 166 transitions. [2018-12-03 18:10:45,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-12-03 18:10:45,636 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:45,636 INFO L402 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1] [2018-12-03 18:10:45,636 INFO L423 AbstractCegarLoop]: === Iteration 107 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:45,636 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:45,637 INFO L82 PathProgramCache]: Analyzing trace with hash 1843761522, now seen corresponding path program 105 times [2018-12-03 18:10:45,637 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:45,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:45,638 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:45,638 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:45,638 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:45,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:49,701 INFO L134 CoverageAnalysis]: Checked inductivity of 4293 backedges. 2862 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:49,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:49,701 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:49,701 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:49,702 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:49,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:49,702 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:49,710 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:10:49,710 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:10:49,841 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:10:49,841 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:49,854 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:58,034 INFO L134 CoverageAnalysis]: Checked inductivity of 4293 backedges. 2862 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:58,034 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:01,584 INFO L134 CoverageAnalysis]: Checked inductivity of 4293 backedges. 2862 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:01,605 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:01,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [109, 109, 109] total 217 [2018-12-03 18:11:01,605 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:01,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 218 states [2018-12-03 18:11:01,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 218 interpolants. [2018-12-03 18:11:01,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9127, Invalid=38179, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 18:11:01,608 INFO L87 Difference]: Start difference. First operand 165 states and 166 transitions. Second operand 218 states. [2018-12-03 18:11:10,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:10,180 INFO L93 Difference]: Finished difference Result 277 states and 279 transitions. [2018-12-03 18:11:10,180 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2018-12-03 18:11:10,180 INFO L78 Accepts]: Start accepts. Automaton has 218 states. Word has length 164 [2018-12-03 18:11:10,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:10,181 INFO L225 Difference]: With dead ends: 277 [2018-12-03 18:11:10,181 INFO L226 Difference]: Without dead ends: 166 [2018-12-03 18:11:10,184 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 112 SyntacticMatches, 107 SemanticMatches, 270 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40070 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=13744, Invalid=59968, Unknown=0, NotChecked=0, Total=73712 [2018-12-03 18:11:10,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-03 18:11:10,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2018-12-03 18:11:10,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-12-03 18:11:10,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2018-12-03 18:11:10,254 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 164 [2018-12-03 18:11:10,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:10,254 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2018-12-03 18:11:10,254 INFO L481 AbstractCegarLoop]: Interpolant automaton has 218 states. [2018-12-03 18:11:10,254 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2018-12-03 18:11:10,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-12-03 18:11:10,255 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:10,255 INFO L402 BasicCegarLoop]: trace histogram [54, 54, 53, 1, 1, 1, 1] [2018-12-03 18:11:10,255 INFO L423 AbstractCegarLoop]: === Iteration 108 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:10,255 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:10,255 INFO L82 PathProgramCache]: Analyzing trace with hash 1318614313, now seen corresponding path program 106 times [2018-12-03 18:11:10,255 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:10,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:10,256 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:10,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:10,256 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:10,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:11,632 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1485 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:11,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:11,632 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:11,633 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:11,633 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:11,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:11,633 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:11:11,642 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:11,642 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:11:11,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:11,778 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:11,855 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1485 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:11,855 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:14,292 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1485 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:14,312 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:14,312 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57, 57] total 59 [2018-12-03 18:11:14,312 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:14,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-12-03 18:11:14,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-12-03 18:11:14,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1658, Invalid=1882, Unknown=0, NotChecked=0, Total=3540 [2018-12-03 18:11:14,313 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand 60 states. [2018-12-03 18:11:15,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:15,806 INFO L93 Difference]: Finished difference Result 174 states and 175 transitions. [2018-12-03 18:11:15,806 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2018-12-03 18:11:15,806 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 165 [2018-12-03 18:11:15,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:15,807 INFO L225 Difference]: With dead ends: 174 [2018-12-03 18:11:15,807 INFO L226 Difference]: Without dead ends: 172 [2018-12-03 18:11:15,808 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 273 SyntacticMatches, 108 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6104 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=4904, Invalid=8206, Unknown=0, NotChecked=0, Total=13110 [2018-12-03 18:11:15,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-12-03 18:11:15,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 168. [2018-12-03 18:11:15,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-12-03 18:11:15,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 169 transitions. [2018-12-03 18:11:15,872 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 169 transitions. Word has length 165 [2018-12-03 18:11:15,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:15,873 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 169 transitions. [2018-12-03 18:11:15,873 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-12-03 18:11:15,873 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 169 transitions. [2018-12-03 18:11:15,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-12-03 18:11:15,873 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:15,873 INFO L402 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1] [2018-12-03 18:11:15,873 INFO L423 AbstractCegarLoop]: === Iteration 109 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:15,874 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:15,874 INFO L82 PathProgramCache]: Analyzing trace with hash 173054787, now seen corresponding path program 107 times [2018-12-03 18:11:15,874 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:15,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:15,874 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:15,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:15,874 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:15,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:20,027 INFO L134 CoverageAnalysis]: Checked inductivity of 4455 backedges. 2970 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:20,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:20,027 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:20,028 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:20,028 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:20,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:20,028 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:11:20,037 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:11:20,037 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:11:20,310 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2018-12-03 18:11:20,311 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:20,319 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:28,784 INFO L134 CoverageAnalysis]: Checked inductivity of 4455 backedges. 2970 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:28,784 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:32,574 INFO L134 CoverageAnalysis]: Checked inductivity of 4455 backedges. 2970 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:32,594 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:32,594 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 111, 111] total 221 [2018-12-03 18:11:32,594 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:32,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 222 states [2018-12-03 18:11:32,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 222 interpolants. [2018-12-03 18:11:32,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9461, Invalid=39601, Unknown=0, NotChecked=0, Total=49062 [2018-12-03 18:11:32,597 INFO L87 Difference]: Start difference. First operand 168 states and 169 transitions. Second operand 222 states. [2018-12-03 18:11:40,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:40,128 INFO L93 Difference]: Finished difference Result 282 states and 284 transitions. [2018-12-03 18:11:40,128 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2018-12-03 18:11:40,128 INFO L78 Accepts]: Start accepts. Automaton has 222 states. Word has length 167 [2018-12-03 18:11:40,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:40,129 INFO L225 Difference]: With dead ends: 282 [2018-12-03 18:11:40,129 INFO L226 Difference]: Without dead ends: 169 [2018-12-03 18:11:40,131 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 114 SyntacticMatches, 109 SemanticMatches, 275 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41582 ImplicationChecksByTransitivity, 18.9s TimeCoverageRelationStatistics Valid=14246, Invalid=62206, Unknown=0, NotChecked=0, Total=76452 [2018-12-03 18:11:40,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-12-03 18:11:40,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-12-03 18:11:40,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-12-03 18:11:40,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-12-03 18:11:40,195 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 167 [2018-12-03 18:11:40,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:40,195 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-12-03 18:11:40,195 INFO L481 AbstractCegarLoop]: Interpolant automaton has 222 states. [2018-12-03 18:11:40,195 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-12-03 18:11:40,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-12-03 18:11:40,196 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:40,196 INFO L402 BasicCegarLoop]: trace histogram [55, 55, 54, 1, 1, 1, 1] [2018-12-03 18:11:40,196 INFO L423 AbstractCegarLoop]: === Iteration 110 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:40,196 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:40,197 INFO L82 PathProgramCache]: Analyzing trace with hash 2078410796, now seen corresponding path program 108 times [2018-12-03 18:11:40,197 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:40,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:40,197 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:40,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:40,198 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:40,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:41,596 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1540 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:41,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:41,596 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:41,596 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:41,597 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:41,597 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:41,597 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:11:41,605 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:11:41,605 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:11:41,748 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:11:41,749 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:41,756 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:41,821 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1540 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:41,821 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:44,303 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1540 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:44,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:44,323 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 60 [2018-12-03 18:11:44,323 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:44,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-12-03 18:11:44,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-12-03 18:11:44,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1716, Invalid=1944, Unknown=0, NotChecked=0, Total=3660 [2018-12-03 18:11:44,324 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 61 states. [2018-12-03 18:11:45,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:45,971 INFO L93 Difference]: Finished difference Result 177 states and 178 transitions. [2018-12-03 18:11:45,971 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2018-12-03 18:11:45,971 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 168 [2018-12-03 18:11:45,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:45,972 INFO L225 Difference]: With dead ends: 177 [2018-12-03 18:11:45,972 INFO L226 Difference]: Without dead ends: 175 [2018-12-03 18:11:45,973 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 278 SyntacticMatches, 110 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6327 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=5077, Invalid=8495, Unknown=0, NotChecked=0, Total=13572 [2018-12-03 18:11:45,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-12-03 18:11:46,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 171. [2018-12-03 18:11:46,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-12-03 18:11:46,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 172 transitions. [2018-12-03 18:11:46,036 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 172 transitions. Word has length 168 [2018-12-03 18:11:46,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:46,036 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 172 transitions. [2018-12-03 18:11:46,036 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-12-03 18:11:46,036 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 172 transitions. [2018-12-03 18:11:46,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-12-03 18:11:46,036 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:46,036 INFO L402 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1] [2018-12-03 18:11:46,037 INFO L423 AbstractCegarLoop]: === Iteration 111 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:46,037 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:46,037 INFO L82 PathProgramCache]: Analyzing trace with hash 193034630, now seen corresponding path program 109 times [2018-12-03 18:11:46,037 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:46,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:46,038 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:46,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:46,038 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:46,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:50,255 INFO L134 CoverageAnalysis]: Checked inductivity of 4620 backedges. 3080 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:50,255 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:50,256 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:50,256 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:50,256 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:50,256 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:50,256 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:11:50,264 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:50,264 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:11:50,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:50,402 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:58,645 INFO L134 CoverageAnalysis]: Checked inductivity of 4620 backedges. 3080 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:58,645 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:02,799 INFO L134 CoverageAnalysis]: Checked inductivity of 4620 backedges. 3080 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:02,818 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:02,819 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [113, 113, 113] total 225 [2018-12-03 18:12:02,819 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:02,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 226 states [2018-12-03 18:12:02,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 226 interpolants. [2018-12-03 18:12:02,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9801, Invalid=41049, Unknown=0, NotChecked=0, Total=50850 [2018-12-03 18:12:02,821 INFO L87 Difference]: Start difference. First operand 171 states and 172 transitions. Second operand 226 states. [2018-12-03 18:12:10,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:10,559 INFO L93 Difference]: Finished difference Result 287 states and 289 transitions. [2018-12-03 18:12:10,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2018-12-03 18:12:10,559 INFO L78 Accepts]: Start accepts. Automaton has 226 states. Word has length 170 [2018-12-03 18:12:10,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:10,560 INFO L225 Difference]: With dead ends: 287 [2018-12-03 18:12:10,560 INFO L226 Difference]: Without dead ends: 172 [2018-12-03 18:12:10,562 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 116 SyntacticMatches, 111 SemanticMatches, 280 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43122 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=14757, Invalid=64485, Unknown=0, NotChecked=0, Total=79242 [2018-12-03 18:12:10,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-12-03 18:12:10,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2018-12-03 18:12:10,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-12-03 18:12:10,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2018-12-03 18:12:10,626 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 170 [2018-12-03 18:12:10,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:10,626 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2018-12-03 18:12:10,626 INFO L481 AbstractCegarLoop]: Interpolant automaton has 226 states. [2018-12-03 18:12:10,626 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2018-12-03 18:12:10,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-12-03 18:12:10,627 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:10,627 INFO L402 BasicCegarLoop]: trace histogram [56, 56, 55, 1, 1, 1, 1] [2018-12-03 18:12:10,627 INFO L423 AbstractCegarLoop]: === Iteration 112 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:10,627 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:10,627 INFO L82 PathProgramCache]: Analyzing trace with hash 366114813, now seen corresponding path program 110 times [2018-12-03 18:12:10,628 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:10,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:10,628 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:10,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:10,628 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:10,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:12,071 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1596 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:12,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:12,072 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:12,072 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:12,072 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:12,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:12,072 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:12:12,081 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:12:12,081 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:12:12,368 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 56 check-sat command(s) [2018-12-03 18:12:12,368 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:12,375 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:12,458 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1596 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:12,458 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:14,989 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1596 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:15,010 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:15,011 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 59, 59] total 61 [2018-12-03 18:12:15,011 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:15,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-12-03 18:12:15,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-12-03 18:12:15,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1775, Invalid=2007, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 18:12:15,012 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand 62 states. [2018-12-03 18:12:16,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:16,713 INFO L93 Difference]: Finished difference Result 180 states and 181 transitions. [2018-12-03 18:12:16,714 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2018-12-03 18:12:16,714 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 171 [2018-12-03 18:12:16,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:16,714 INFO L225 Difference]: With dead ends: 180 [2018-12-03 18:12:16,714 INFO L226 Difference]: Without dead ends: 178 [2018-12-03 18:12:16,715 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 283 SyntacticMatches, 112 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6554 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=5253, Invalid=8789, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 18:12:16,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-12-03 18:12:16,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 174. [2018-12-03 18:12:16,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-12-03 18:12:16,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 175 transitions. [2018-12-03 18:12:16,778 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 175 transitions. Word has length 171 [2018-12-03 18:12:16,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:16,779 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 175 transitions. [2018-12-03 18:12:16,779 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-12-03 18:12:16,779 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 175 transitions. [2018-12-03 18:12:16,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-12-03 18:12:16,779 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:16,779 INFO L402 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1] [2018-12-03 18:12:16,779 INFO L423 AbstractCegarLoop]: === Iteration 113 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:16,780 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:16,780 INFO L82 PathProgramCache]: Analyzing trace with hash -350930665, now seen corresponding path program 111 times [2018-12-03 18:12:16,780 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:16,780 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:16,780 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:16,780 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:16,780 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:16,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:21,192 INFO L134 CoverageAnalysis]: Checked inductivity of 4788 backedges. 3192 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:21,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:21,192 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:21,192 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:21,192 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:21,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:21,192 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:12:21,203 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:12:21,203 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:12:21,346 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:12:21,347 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:21,358 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:30,345 INFO L134 CoverageAnalysis]: Checked inductivity of 4788 backedges. 3192 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:30,345 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:34,435 INFO L134 CoverageAnalysis]: Checked inductivity of 4788 backedges. 3192 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:34,455 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:34,456 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 115, 115] total 229 [2018-12-03 18:12:34,456 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:34,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 230 states [2018-12-03 18:12:34,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 230 interpolants. [2018-12-03 18:12:34,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10147, Invalid=42523, Unknown=0, NotChecked=0, Total=52670 [2018-12-03 18:12:34,459 INFO L87 Difference]: Start difference. First operand 174 states and 175 transitions. Second operand 230 states. [2018-12-03 18:12:43,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:43,934 INFO L93 Difference]: Finished difference Result 292 states and 294 transitions. [2018-12-03 18:12:43,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2018-12-03 18:12:43,934 INFO L78 Accepts]: Start accepts. Automaton has 230 states. Word has length 173 [2018-12-03 18:12:43,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:43,935 INFO L225 Difference]: With dead ends: 292 [2018-12-03 18:12:43,935 INFO L226 Difference]: Without dead ends: 175 [2018-12-03 18:12:43,937 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 118 SyntacticMatches, 113 SemanticMatches, 285 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44690 ImplicationChecksByTransitivity, 20.0s TimeCoverageRelationStatistics Valid=15277, Invalid=66805, Unknown=0, NotChecked=0, Total=82082 [2018-12-03 18:12:43,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-12-03 18:12:44,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2018-12-03 18:12:44,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-12-03 18:12:44,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 176 transitions. [2018-12-03 18:12:44,005 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 176 transitions. Word has length 173 [2018-12-03 18:12:44,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:44,005 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 176 transitions. [2018-12-03 18:12:44,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has 230 states. [2018-12-03 18:12:44,005 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 176 transitions. [2018-12-03 18:12:44,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-12-03 18:12:44,006 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:44,006 INFO L402 BasicCegarLoop]: trace histogram [57, 57, 56, 1, 1, 1, 1] [2018-12-03 18:12:44,006 INFO L423 AbstractCegarLoop]: === Iteration 114 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:44,006 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:44,006 INFO L82 PathProgramCache]: Analyzing trace with hash 1920045888, now seen corresponding path program 112 times [2018-12-03 18:12:44,006 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:44,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:44,007 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:44,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:44,007 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:44,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:45,703 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1653 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:45,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:45,704 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:45,704 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:45,704 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:45,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:45,704 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:12:45,712 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:45,712 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:12:45,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:45,849 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:45,929 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1653 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:45,930 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:48,360 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1653 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:48,380 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:48,380 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60, 60] total 62 [2018-12-03 18:12:48,380 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:48,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 18:12:48,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 18:12:48,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1835, Invalid=2071, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 18:12:48,381 INFO L87 Difference]: Start difference. First operand 175 states and 176 transitions. Second operand 63 states. [2018-12-03 18:12:50,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:50,287 INFO L93 Difference]: Finished difference Result 183 states and 184 transitions. [2018-12-03 18:12:50,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2018-12-03 18:12:50,287 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 174 [2018-12-03 18:12:50,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:50,288 INFO L225 Difference]: With dead ends: 183 [2018-12-03 18:12:50,288 INFO L226 Difference]: Without dead ends: 181 [2018-12-03 18:12:50,289 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 521 GetRequests, 288 SyntacticMatches, 114 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6785 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=5432, Invalid=9088, Unknown=0, NotChecked=0, Total=14520 [2018-12-03 18:12:50,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-12-03 18:12:50,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 177. [2018-12-03 18:12:50,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-12-03 18:12:50,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 178 transitions. [2018-12-03 18:12:50,354 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 178 transitions. Word has length 174 [2018-12-03 18:12:50,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:50,355 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 178 transitions. [2018-12-03 18:12:50,355 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 18:12:50,355 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 178 transitions. [2018-12-03 18:12:50,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-12-03 18:12:50,355 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:50,355 INFO L402 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1] [2018-12-03 18:12:50,356 INFO L423 AbstractCegarLoop]: === Iteration 115 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:50,356 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:50,356 INFO L82 PathProgramCache]: Analyzing trace with hash -1671786598, now seen corresponding path program 113 times [2018-12-03 18:12:50,356 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:50,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:50,356 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:50,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:50,357 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:50,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:54,732 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 3306 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:54,732 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:54,732 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:54,732 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:54,733 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:54,733 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:54,733 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:12:54,742 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:12:54,742 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:12:55,049 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2018-12-03 18:12:55,049 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:55,057 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:04,218 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 3306 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:04,218 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:08,674 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 3306 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:08,694 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:08,694 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 233 [2018-12-03 18:13:08,694 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:08,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 234 states [2018-12-03 18:13:08,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 234 interpolants. [2018-12-03 18:13:08,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10499, Invalid=44023, Unknown=0, NotChecked=0, Total=54522 [2018-12-03 18:13:08,698 INFO L87 Difference]: Start difference. First operand 177 states and 178 transitions. Second operand 234 states. [2018-12-03 18:13:13,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:13,635 INFO L93 Difference]: Finished difference Result 297 states and 299 transitions. [2018-12-03 18:13:13,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2018-12-03 18:13:13,635 INFO L78 Accepts]: Start accepts. Automaton has 234 states. Word has length 176 [2018-12-03 18:13:13,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:13,635 INFO L225 Difference]: With dead ends: 297 [2018-12-03 18:13:13,635 INFO L226 Difference]: Without dead ends: 178 [2018-12-03 18:13:13,638 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 525 GetRequests, 120 SyntacticMatches, 115 SemanticMatches, 290 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46286 ImplicationChecksByTransitivity, 20.6s TimeCoverageRelationStatistics Valid=15806, Invalid=69166, Unknown=0, NotChecked=0, Total=84972 [2018-12-03 18:13:13,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-12-03 18:13:13,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-12-03 18:13:13,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-12-03 18:13:13,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 179 transitions. [2018-12-03 18:13:13,709 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 179 transitions. Word has length 176 [2018-12-03 18:13:13,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:13,709 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 179 transitions. [2018-12-03 18:13:13,709 INFO L481 AbstractCegarLoop]: Interpolant automaton has 234 states. [2018-12-03 18:13:13,709 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 179 transitions. [2018-12-03 18:13:13,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-12-03 18:13:13,709 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:13,710 INFO L402 BasicCegarLoop]: trace histogram [58, 58, 57, 1, 1, 1, 1] [2018-12-03 18:13:13,710 INFO L423 AbstractCegarLoop]: === Iteration 116 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:13,710 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:13,710 INFO L82 PathProgramCache]: Analyzing trace with hash -1334142767, now seen corresponding path program 114 times [2018-12-03 18:13:13,710 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:13,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:13,711 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:13:13,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:13,711 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:13,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:15,276 INFO L134 CoverageAnalysis]: Checked inductivity of 5017 backedges. 1711 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:15,277 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:15,277 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:15,277 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:15,277 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:15,277 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:15,277 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:13:15,286 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:13:15,287 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:13:15,431 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:13:15,432 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:13:15,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:15,521 INFO L134 CoverageAnalysis]: Checked inductivity of 5017 backedges. 1711 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:15,521 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:18,111 INFO L134 CoverageAnalysis]: Checked inductivity of 5017 backedges. 1711 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:18,131 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:18,132 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 61, 61] total 63 [2018-12-03 18:13:18,132 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:18,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-12-03 18:13:18,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-12-03 18:13:18,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1896, Invalid=2136, Unknown=0, NotChecked=0, Total=4032 [2018-12-03 18:13:18,133 INFO L87 Difference]: Start difference. First operand 178 states and 179 transitions. Second operand 64 states. [2018-12-03 18:13:19,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:19,808 INFO L93 Difference]: Finished difference Result 186 states and 187 transitions. [2018-12-03 18:13:19,808 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-12-03 18:13:19,808 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 177 [2018-12-03 18:13:19,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:19,809 INFO L225 Difference]: With dead ends: 186 [2018-12-03 18:13:19,809 INFO L226 Difference]: Without dead ends: 184 [2018-12-03 18:13:19,810 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 293 SyntacticMatches, 116 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7020 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=5614, Invalid=9392, Unknown=0, NotChecked=0, Total=15006 [2018-12-03 18:13:19,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-12-03 18:13:19,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 180. [2018-12-03 18:13:19,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-12-03 18:13:19,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 181 transitions. [2018-12-03 18:13:19,882 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 181 transitions. Word has length 177 [2018-12-03 18:13:19,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:19,883 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 181 transitions. [2018-12-03 18:13:19,883 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-12-03 18:13:19,883 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 181 transitions. [2018-12-03 18:13:19,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-12-03 18:13:19,883 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:19,883 INFO L402 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1] [2018-12-03 18:13:19,883 INFO L423 AbstractCegarLoop]: === Iteration 117 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:19,884 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:19,884 INFO L82 PathProgramCache]: Analyzing trace with hash 2084074731, now seen corresponding path program 115 times [2018-12-03 18:13:19,884 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:19,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:19,885 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:13:19,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:19,885 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:19,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:24,506 INFO L134 CoverageAnalysis]: Checked inductivity of 5133 backedges. 3422 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:24,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:24,507 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:24,507 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:24,507 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:24,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:24,507 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:13:24,520 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:13:24,521 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:13:24,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:24,664 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:34,033 INFO L134 CoverageAnalysis]: Checked inductivity of 5133 backedges. 3422 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:34,033 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:38,497 INFO L134 CoverageAnalysis]: Checked inductivity of 5133 backedges. 3422 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:38,537 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:38,538 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [119, 119, 119] total 237 [2018-12-03 18:13:38,538 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:38,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 238 states [2018-12-03 18:13:38,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 238 interpolants. [2018-12-03 18:13:38,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10857, Invalid=45549, Unknown=0, NotChecked=0, Total=56406 [2018-12-03 18:13:38,541 INFO L87 Difference]: Start difference. First operand 180 states and 181 transitions. Second operand 238 states. [2018-12-03 18:13:45,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:45,257 INFO L93 Difference]: Finished difference Result 302 states and 304 transitions. [2018-12-03 18:13:45,257 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2018-12-03 18:13:45,257 INFO L78 Accepts]: Start accepts. Automaton has 238 states. Word has length 179 [2018-12-03 18:13:45,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:45,257 INFO L225 Difference]: With dead ends: 302 [2018-12-03 18:13:45,257 INFO L226 Difference]: Without dead ends: 181 [2018-12-03 18:13:45,259 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 534 GetRequests, 122 SyntacticMatches, 117 SemanticMatches, 295 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47910 ImplicationChecksByTransitivity, 21.0s TimeCoverageRelationStatistics Valid=16344, Invalid=71568, Unknown=0, NotChecked=0, Total=87912 [2018-12-03 18:13:45,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-12-03 18:13:45,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 181. [2018-12-03 18:13:45,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-12-03 18:13:45,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 182 transitions. [2018-12-03 18:13:45,334 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 182 transitions. Word has length 179 [2018-12-03 18:13:45,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:45,334 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 182 transitions. [2018-12-03 18:13:45,334 INFO L481 AbstractCegarLoop]: Interpolant automaton has 238 states. [2018-12-03 18:13:45,334 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 182 transitions. [2018-12-03 18:13:45,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2018-12-03 18:13:45,335 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:45,335 INFO L402 BasicCegarLoop]: trace histogram [59, 59, 58, 1, 1, 1, 1] [2018-12-03 18:13:45,335 INFO L423 AbstractCegarLoop]: === Iteration 118 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:45,336 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:45,336 INFO L82 PathProgramCache]: Analyzing trace with hash 2018036820, now seen corresponding path program 116 times [2018-12-03 18:13:45,336 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:45,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:45,337 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:13:45,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:45,337 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:45,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:47,027 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1770 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:47,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:47,027 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:47,028 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:47,028 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:47,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:47,028 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:13:47,037 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:13:47,037 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:13:47,349 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2018-12-03 18:13:47,349 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:13:47,356 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:47,438 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1770 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:47,438 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:50,019 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1770 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:50,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:50,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 64 [2018-12-03 18:13:50,041 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:50,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 18:13:50,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 18:13:50,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1958, Invalid=2202, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 18:13:50,042 INFO L87 Difference]: Start difference. First operand 181 states and 182 transitions. Second operand 65 states. [2018-12-03 18:13:51,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:51,981 INFO L93 Difference]: Finished difference Result 189 states and 190 transitions. [2018-12-03 18:13:51,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2018-12-03 18:13:51,981 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 180 [2018-12-03 18:13:51,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:51,982 INFO L225 Difference]: With dead ends: 189 [2018-12-03 18:13:51,982 INFO L226 Difference]: Without dead ends: 187 [2018-12-03 18:13:51,983 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 539 GetRequests, 298 SyntacticMatches, 118 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7259 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=5799, Invalid=9701, Unknown=0, NotChecked=0, Total=15500 [2018-12-03 18:13:51,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-12-03 18:13:52,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 183. [2018-12-03 18:13:52,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-12-03 18:13:52,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 184 transitions. [2018-12-03 18:13:52,052 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 184 transitions. Word has length 180 [2018-12-03 18:13:52,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:52,052 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 184 transitions. [2018-12-03 18:13:52,052 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 18:13:52,052 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 184 transitions. [2018-12-03 18:13:52,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-12-03 18:13:52,053 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:52,053 INFO L402 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1] [2018-12-03 18:13:52,053 INFO L423 AbstractCegarLoop]: === Iteration 119 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:52,053 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:52,053 INFO L82 PathProgramCache]: Analyzing trace with hash -1991781458, now seen corresponding path program 117 times [2018-12-03 18:13:52,053 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:52,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:52,054 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:13:52,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:52,054 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:52,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:56,892 INFO L134 CoverageAnalysis]: Checked inductivity of 5310 backedges. 3540 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:56,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:56,893 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:56,893 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:56,893 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:56,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:56,893 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:13:56,905 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:13:56,905 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:13:57,053 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:13:57,053 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:13:57,064 INFO L273 TraceCheckSpWp]: Computing forward predicates...