java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default_PUPT.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/functions1.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-00a8621 [2018-09-30 10:51:15,010 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-30 10:51:15,012 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-30 10:51:15,026 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2018-09-30 10:51:15,083 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default_PUPT.epf [2018-09-30 10:51:15,109 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-30 10:51:15,109 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-30 10:51:15,110 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-30 10:51:15,110 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-30 10:51:15,111 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-30 10:51:15,111 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-30 10:51:15,111 INFO L133 SettingsManager]: * Use SBE=true [2018-09-30 10:51:15,111 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-30 10:51:15,112 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-30 10:51:15,112 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-30 10:51:15,112 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-30 10:51:15,112 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-30 10:51:15,112 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-30 10:51:15,112 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-30 10:51:15,113 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-30 10:51:15,113 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-30 10:51:15,113 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-30 10:51:15,113 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-30 10:51:15,113 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-30 10:51:15,114 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-30 10:51:15,114 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-30 10:51:15,114 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-30 10:51:15,114 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-30 10:51:15,114 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-30 10:51:15,115 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-30 10:51:15,115 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-30 10:51:15,115 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-30 10:51:15,115 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-30 10:51:15,115 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-30 10:51:15,116 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-30 10:51:15,116 INFO L133 SettingsManager]: * Use predicate trie based predicate unification=true [2018-09-30 10:51:15,158 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-30 10:51:15,171 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-30 10:51:15,175 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-30 10:51:15,177 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-30 10:51:15,177 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-30 10:51:15,178 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/functions1.i_3.bpl [2018-09-30 10:51:15,178 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/functions1.i_3.bpl' [2018-09-30 10:51:15,251 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-30 10:51:15,254 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-30 10:51:15,258 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-30 10:51:15,258 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-30 10:51:15,258 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-30 10:51:15,278 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:51:15" (1/1) ... [2018-09-30 10:51:15,291 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:51:15" (1/1) ... [2018-09-30 10:51:15,298 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-30 10:51:15,298 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-30 10:51:15,299 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-30 10:51:15,299 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-30 10:51:15,310 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:51:15" (1/1) ... [2018-09-30 10:51:15,310 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:51:15" (1/1) ... [2018-09-30 10:51:15,311 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:51:15" (1/1) ... [2018-09-30 10:51:15,311 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:51:15" (1/1) ... [2018-09-30 10:51:15,315 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:51:15" (1/1) ... [2018-09-30 10:51:15,316 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:51:15" (1/1) ... [2018-09-30 10:51:15,317 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:51:15" (1/1) ... [2018-09-30 10:51:15,319 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-30 10:51:15,320 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-30 10:51:15,320 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-30 10:51:15,320 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-30 10:51:15,321 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:51:15" (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 [2018-09-30 10:51:15,381 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-30 10:51:15,381 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-30 10:51:15,621 INFO L348 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-30 10:51:15,622 INFO L202 PluginConnector]: Adding new model functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 10:51:15 BoogieIcfgContainer [2018-09-30 10:51:15,622 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-30 10:51:15,623 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-30 10:51:15,624 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-30 10:51:15,627 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-30 10:51:15,628 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:51:15" (1/2) ... [2018-09-30 10:51:15,629 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6894dbd2 and model type functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.09 10:51:15, skipping insertion in model container [2018-09-30 10:51:15,629 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 10:51:15" (2/2) ... [2018-09-30 10:51:15,631 INFO L112 eAbstractionObserver]: Analyzing ICFG functions1.i_3.bpl [2018-09-30 10:51:15,642 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-30 10:51:15,651 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-30 10:51:15,708 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-30 10:51:15,709 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-30 10:51:15,709 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-30 10:51:15,709 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-30 10:51:15,710 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-30 10:51:15,710 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-30 10:51:15,710 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-30 10:51:15,710 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-30 10:51:15,710 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-30 10:51:15,726 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-09-30 10:51:15,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-30 10:51:15,734 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:51:15,735 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-30 10:51:15,736 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:51:15,744 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:51:15,745 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-09-30 10:51:15,747 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:51:15,748 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:51:15,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:15,807 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:51:15,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:15,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:51:15,936 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:15,938 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-30 10:51:15,939 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-30 10:51:15,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-30 10:51:15,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-30 10:51:15,959 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:51:15,962 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-09-30 10:51:16,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:51:16,121 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-09-30 10:51:16,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-30 10:51:16,123 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-09-30 10:51:16,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:51:16,143 INFO L225 Difference]: With dead ends: 11 [2018-09-30 10:51:16,143 INFO L226 Difference]: Without dead ends: 7 [2018-09-30 10:51:16,148 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:51:16,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-09-30 10:51:16,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-09-30 10:51:16,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-09-30 10:51:16,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-09-30 10:51:16,186 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-09-30 10:51:16,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:51:16,187 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-09-30 10:51:16,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-30 10:51:16,187 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-09-30 10:51:16,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-30 10:51:16,188 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:51:16,188 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-09-30 10:51:16,188 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:51:16,189 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:51:16,189 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-09-30 10:51:16,189 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:51:16,189 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:51:16,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:16,190 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:51:16,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:16,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:51:16,300 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:16,300 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:51:16,300 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:51:16,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:51:16,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:51:16,343 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:51:16,411 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:16,448 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:51:16,448 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-09-30 10:51:16,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-30 10:51:16,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-30 10:51:16,450 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:51:16,450 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-09-30 10:51:16,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:51:16,847 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-09-30 10:51:16,848 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-30 10:51:16,848 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-09-30 10:51:16,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:51:16,849 INFO L225 Difference]: With dead ends: 11 [2018-09-30 10:51:16,849 INFO L226 Difference]: Without dead ends: 9 [2018-09-30 10:51:16,850 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:51:16,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-30 10:51:16,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-30 10:51:16,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-30 10:51:16,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-09-30 10:51:16,854 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-09-30 10:51:16,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:51:16,854 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-09-30 10:51:16,855 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-30 10:51:16,855 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-09-30 10:51:16,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-30 10:51:16,856 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:51:16,856 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-09-30 10:51:16,856 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:51:16,856 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:51:16,857 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-09-30 10:51:16,857 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:51:16,857 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:51:16,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:16,858 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:51:16,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:16,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:51:16,968 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:16,969 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:51:16,969 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:51:16,984 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 10:51:17,016 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 10:51:17,016 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:51:17,018 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:51:17,169 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:17,189 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:51:17,190 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-09-30 10:51:17,190 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-30 10:51:17,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-30 10:51:17,190 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:51:17,191 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-09-30 10:51:17,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:51:17,471 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-09-30 10:51:17,472 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-30 10:51:17,472 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-09-30 10:51:17,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:51:17,473 INFO L225 Difference]: With dead ends: 13 [2018-09-30 10:51:17,473 INFO L226 Difference]: Without dead ends: 11 [2018-09-30 10:51:17,473 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:51:17,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-30 10:51:17,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-30 10:51:17,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-30 10:51:17,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-09-30 10:51:17,478 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-09-30 10:51:17,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:51:17,480 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-09-30 10:51:17,480 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-30 10:51:17,481 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-09-30 10:51:17,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-30 10:51:17,481 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:51:17,481 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-09-30 10:51:17,482 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:51:17,482 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:51:17,483 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-09-30 10:51:17,483 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:51:17,483 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:51:17,484 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:17,484 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:51:17,485 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:17,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:51:17,609 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:17,610 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:51:17,610 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:51:17,619 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 10:51:17,674 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-30 10:51:17,674 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:51:17,677 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:51:17,814 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:17,849 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:51:17,849 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-09-30 10:51:17,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-30 10:51:17,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-30 10:51:17,850 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:51:17,850 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-09-30 10:51:18,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:51:18,027 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-09-30 10:51:18,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-30 10:51:18,029 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-09-30 10:51:18,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:51:18,030 INFO L225 Difference]: With dead ends: 15 [2018-09-30 10:51:18,030 INFO L226 Difference]: Without dead ends: 13 [2018-09-30 10:51:18,030 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:51:18,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-30 10:51:18,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-30 10:51:18,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-30 10:51:18,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-09-30 10:51:18,034 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-09-30 10:51:18,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:51:18,035 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-09-30 10:51:18,035 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-30 10:51:18,035 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-09-30 10:51:18,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-09-30 10:51:18,036 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:51:18,036 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-09-30 10:51:18,036 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:51:18,036 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:51:18,036 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-09-30 10:51:18,036 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:51:18,037 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:51:18,037 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:18,038 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:51:18,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:18,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:51:18,187 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:18,187 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:51:18,187 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:51:18,199 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 10:51:18,239 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 10:51:18,240 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:51:18,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:51:18,557 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:18,592 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:51:18,592 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-30 10:51:18,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-30 10:51:18,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-30 10:51:18,593 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:51:18,593 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-09-30 10:51:19,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:51:19,001 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-09-30 10:51:19,003 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-30 10:51:19,003 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-09-30 10:51:19,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:51:19,004 INFO L225 Difference]: With dead ends: 17 [2018-09-30 10:51:19,004 INFO L226 Difference]: Without dead ends: 15 [2018-09-30 10:51:19,005 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:51:19,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-30 10:51:19,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-30 10:51:19,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-30 10:51:19,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-09-30 10:51:19,008 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-09-30 10:51:19,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:51:19,009 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-09-30 10:51:19,009 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-30 10:51:19,009 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-09-30 10:51:19,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-30 10:51:19,010 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:51:19,010 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-09-30 10:51:19,010 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:51:19,011 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:51:19,011 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-09-30 10:51:19,011 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:51:19,011 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:51:19,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:19,012 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:51:19,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:19,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:51:19,226 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:19,227 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:51:19,227 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:51:19,235 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 10:51:19,577 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-30 10:51:19,578 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:51:19,581 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:51:19,634 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:19,663 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:51:19,664 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-09-30 10:51:19,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-30 10:51:19,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-30 10:51:19,665 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:51:19,665 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-09-30 10:51:19,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:51:19,964 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-30 10:51:19,964 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-30 10:51:19,964 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-09-30 10:51:19,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:51:19,965 INFO L225 Difference]: With dead ends: 19 [2018-09-30 10:51:19,965 INFO L226 Difference]: Without dead ends: 17 [2018-09-30 10:51:19,966 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:51:19,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-30 10:51:19,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-30 10:51:19,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-30 10:51:19,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-30 10:51:19,970 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-09-30 10:51:19,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:51:19,971 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-30 10:51:19,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-30 10:51:19,971 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-30 10:51:19,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-09-30 10:51:19,972 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:51:19,972 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-09-30 10:51:19,972 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:51:19,972 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:51:19,973 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-09-30 10:51:19,973 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:51:19,973 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:51:19,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:19,974 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:51:19,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:19,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:51:20,161 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:20,162 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:51:20,162 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:51:20,179 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 10:51:20,217 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-30 10:51:20,217 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:51:20,220 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:51:20,288 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:20,309 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:51:20,309 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-09-30 10:51:20,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-30 10:51:20,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-30 10:51:20,310 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:51:20,310 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-09-30 10:51:20,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:51:20,591 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-30 10:51:20,594 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-30 10:51:20,595 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-09-30 10:51:20,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:51:20,595 INFO L225 Difference]: With dead ends: 21 [2018-09-30 10:51:20,595 INFO L226 Difference]: Without dead ends: 19 [2018-09-30 10:51:20,596 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:51:20,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-30 10:51:20,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-30 10:51:20,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-30 10:51:20,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-30 10:51:20,600 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-09-30 10:51:20,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:51:20,601 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-30 10:51:20,601 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-30 10:51:20,601 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-30 10:51:20,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-30 10:51:20,602 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:51:20,602 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-09-30 10:51:20,602 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:51:20,602 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:51:20,603 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-09-30 10:51:20,603 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:51:20,603 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:51:20,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:20,604 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:51:20,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:20,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:51:20,993 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:20,993 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:51:20,993 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:51:21,003 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:51:21,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:51:21,026 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:51:21,082 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:21,102 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:51:21,102 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-30 10:51:21,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-30 10:51:21,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-30 10:51:21,103 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:51:21,103 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-09-30 10:51:21,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:51:21,649 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-30 10:51:21,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-30 10:51:21,651 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-09-30 10:51:21,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:51:21,652 INFO L225 Difference]: With dead ends: 23 [2018-09-30 10:51:21,652 INFO L226 Difference]: Without dead ends: 21 [2018-09-30 10:51:21,652 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:51:21,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-30 10:51:21,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-09-30 10:51:21,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-30 10:51:21,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-09-30 10:51:21,656 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-09-30 10:51:21,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:51:21,657 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-09-30 10:51:21,657 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-30 10:51:21,657 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-09-30 10:51:21,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-30 10:51:21,658 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:51:21,658 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-09-30 10:51:21,658 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:51:21,659 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:51:21,659 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-09-30 10:51:21,659 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:51:21,659 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:51:21,660 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:21,660 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:51:21,660 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:21,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:51:21,853 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:21,854 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:51:21,854 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:51:21,863 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 10:51:21,881 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 10:51:21,881 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:51:21,883 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:51:21,963 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:21,983 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:51:21,983 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-09-30 10:51:21,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-30 10:51:21,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-30 10:51:21,984 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:51:21,984 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-09-30 10:51:22,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:51:22,413 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-30 10:51:22,418 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-30 10:51:22,418 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-09-30 10:51:22,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:51:22,419 INFO L225 Difference]: With dead ends: 25 [2018-09-30 10:51:22,419 INFO L226 Difference]: Without dead ends: 23 [2018-09-30 10:51:22,419 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:51:22,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-30 10:51:22,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-30 10:51:22,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-30 10:51:22,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-09-30 10:51:22,424 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-09-30 10:51:22,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:51:22,425 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-09-30 10:51:22,425 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-30 10:51:22,425 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-09-30 10:51:22,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-30 10:51:22,426 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:51:22,426 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-09-30 10:51:22,426 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:51:22,426 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:51:22,427 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-09-30 10:51:22,427 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:51:22,427 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:51:22,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:22,428 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:51:22,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:22,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:51:22,672 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:22,672 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:51:22,673 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:51:22,682 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 10:51:42,365 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-30 10:51:42,365 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:51:42,397 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:51:42,589 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:42,610 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:51:42,611 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-09-30 10:51:42,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-30 10:51:42,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-30 10:51:42,611 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:51:42,611 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 12 states. [2018-09-30 10:51:43,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:51:43,137 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-30 10:51:43,138 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-30 10:51:43,138 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2018-09-30 10:51:43,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:51:43,139 INFO L225 Difference]: With dead ends: 27 [2018-09-30 10:51:43,139 INFO L226 Difference]: Without dead ends: 25 [2018-09-30 10:51:43,140 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:51:43,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-09-30 10:51:43,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-09-30 10:51:43,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-09-30 10:51:43,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-09-30 10:51:43,144 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-09-30 10:51:43,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:51:43,145 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-09-30 10:51:43,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-30 10:51:43,145 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-09-30 10:51:43,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-09-30 10:51:43,145 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:51:43,145 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1] [2018-09-30 10:51:43,146 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:51:43,146 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:51:43,146 INFO L82 PathProgramCache]: Analyzing trace with hash -1724181365, now seen corresponding path program 10 times [2018-09-30 10:51:43,146 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:51:43,146 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:51:43,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:43,147 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:51:43,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:43,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:51:43,354 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:43,355 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:51:43,355 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:51:43,363 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 10:51:43,405 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 10:51:43,406 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:51:43,409 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:51:43,868 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:43,889 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:51:43,889 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-09-30 10:51:43,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-30 10:51:43,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-30 10:51:43,890 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:51:43,890 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 13 states. [2018-09-30 10:51:44,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:51:44,708 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-30 10:51:44,708 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-30 10:51:44,708 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-09-30 10:51:44,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:51:44,709 INFO L225 Difference]: With dead ends: 29 [2018-09-30 10:51:44,709 INFO L226 Difference]: Without dead ends: 27 [2018-09-30 10:51:44,710 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:51:44,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-30 10:51:44,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-30 10:51:44,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-30 10:51:44,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-09-30 10:51:44,715 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-09-30 10:51:44,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:51:44,715 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-09-30 10:51:44,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-30 10:51:44,715 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-09-30 10:51:44,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-30 10:51:44,716 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:51:44,716 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1] [2018-09-30 10:51:44,716 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:51:44,716 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:51:44,717 INFO L82 PathProgramCache]: Analyzing trace with hash 919136581, now seen corresponding path program 11 times [2018-09-30 10:51:44,717 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:51:44,717 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:51:44,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:44,718 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:51:44,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:51:44,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:51:45,135 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:51:45,136 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:51:45,136 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:51:45,144 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 10:52:53,617 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-30 10:52:53,617 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:52:55,022 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:52:55,136 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:52:55,141 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:52:55,142 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-09-30 10:52:55,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-30 10:52:55,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-30 10:52:55,142 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:52:55,143 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 14 states. [2018-09-30 10:52:55,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:52:55,797 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-30 10:52:55,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-30 10:52:55,800 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 26 [2018-09-30 10:52:55,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:52:55,800 INFO L225 Difference]: With dead ends: 31 [2018-09-30 10:52:55,800 INFO L226 Difference]: Without dead ends: 29 [2018-09-30 10:52:55,801 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:52:55,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-30 10:52:55,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-09-30 10:52:55,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-30 10:52:55,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-09-30 10:52:55,807 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-09-30 10:52:55,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:52:55,807 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-09-30 10:52:55,807 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-30 10:52:55,807 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-09-30 10:52:55,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-09-30 10:52:55,808 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:52:55,808 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1] [2018-09-30 10:52:55,808 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:52:55,808 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:52:55,808 INFO L82 PathProgramCache]: Analyzing trace with hash -1472956545, now seen corresponding path program 12 times [2018-09-30 10:52:55,808 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:52:55,808 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:52:55,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:52:55,809 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:52:55,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:52:55,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:52:56,277 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:52:56,277 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:52:56,277 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:52:56,285 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 10:53:16,353 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-30 10:53:16,353 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:53:16,409 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:53:16,719 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:53:16,741 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:53:16,741 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-09-30 10:53:16,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-30 10:53:16,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-30 10:53:16,742 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:53:16,742 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2018-09-30 10:53:17,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:53:17,662 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-30 10:53:17,662 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-30 10:53:17,662 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2018-09-30 10:53:17,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:53:17,663 INFO L225 Difference]: With dead ends: 33 [2018-09-30 10:53:17,663 INFO L226 Difference]: Without dead ends: 31 [2018-09-30 10:53:17,664 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:53:17,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-30 10:53:17,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-30 10:53:17,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-30 10:53:17,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-09-30 10:53:17,669 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-09-30 10:53:17,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:53:17,670 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-09-30 10:53:17,670 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-30 10:53:17,670 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-09-30 10:53:17,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-30 10:53:17,671 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:53:17,671 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1] [2018-09-30 10:53:17,671 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:53:17,671 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:53:17,671 INFO L82 PathProgramCache]: Analyzing trace with hash 1828020025, now seen corresponding path program 13 times [2018-09-30 10:53:17,672 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:53:17,672 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:53:17,672 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:53:17,673 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:53:17,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:53:17,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:53:18,025 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:53:18,026 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:53:18,026 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:53:18,035 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:53:18,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:53:18,064 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:53:18,366 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:53:18,399 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:53:18,399 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-30 10:53:18,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-30 10:53:18,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-30 10:53:18,400 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:53:18,400 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 16 states. [2018-09-30 10:53:19,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:53:19,357 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-30 10:53:19,358 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-30 10:53:19,358 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2018-09-30 10:53:19,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:53:19,359 INFO L225 Difference]: With dead ends: 35 [2018-09-30 10:53:19,359 INFO L226 Difference]: Without dead ends: 33 [2018-09-30 10:53:19,360 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:53:19,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-30 10:53:19,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-09-30 10:53:19,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-30 10:53:19,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-30 10:53:19,367 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-09-30 10:53:19,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:53:19,367 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-30 10:53:19,367 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-30 10:53:19,368 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-30 10:53:19,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-30 10:53:19,368 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:53:19,369 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1] [2018-09-30 10:53:19,369 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:53:19,369 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:53:19,369 INFO L82 PathProgramCache]: Analyzing trace with hash 85672051, now seen corresponding path program 14 times [2018-09-30 10:53:19,369 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:53:19,370 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:53:19,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:53:19,370 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:53:19,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:53:19,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:53:19,800 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:53:19,801 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:53:19,801 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:53:19,812 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 10:53:19,844 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 10:53:19,845 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:53:19,849 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:53:20,059 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:53:20,083 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:53:20,083 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-09-30 10:53:20,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-30 10:53:20,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-30 10:53:20,084 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:53:20,084 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 17 states. [2018-09-30 10:53:21,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:53:21,138 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-09-30 10:53:21,138 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-30 10:53:21,138 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-09-30 10:53:21,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:53:21,139 INFO L225 Difference]: With dead ends: 37 [2018-09-30 10:53:21,140 INFO L226 Difference]: Without dead ends: 35 [2018-09-30 10:53:21,140 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:53:21,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-09-30 10:53:21,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-09-30 10:53:21,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-30 10:53:21,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-09-30 10:53:21,144 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-09-30 10:53:21,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:53:21,145 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-09-30 10:53:21,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-30 10:53:21,145 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-09-30 10:53:21,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-30 10:53:21,146 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:53:21,146 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1] [2018-09-30 10:53:21,146 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:53:21,146 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:53:21,147 INFO L82 PathProgramCache]: Analyzing trace with hash 726514477, now seen corresponding path program 15 times [2018-09-30 10:53:21,147 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:53:21,147 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:53:21,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:53:21,148 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:53:21,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:53:21,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:53:21,648 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:53:21,648 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:53:21,648 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:53:21,656 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 10:53:48,021 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-30 10:53:48,021 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:53:48,050 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:53:48,156 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:53:48,176 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:53:48,176 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-09-30 10:53:48,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-30 10:53:48,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-30 10:53:48,177 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:53:48,177 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 18 states. [2018-09-30 10:53:49,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:53:49,234 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-30 10:53:49,236 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-30 10:53:49,236 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2018-09-30 10:53:49,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:53:49,237 INFO L225 Difference]: With dead ends: 39 [2018-09-30 10:53:49,237 INFO L226 Difference]: Without dead ends: 37 [2018-09-30 10:53:49,237 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:53:49,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-30 10:53:49,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-09-30 10:53:49,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-09-30 10:53:49,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-09-30 10:53:49,242 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-09-30 10:53:49,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:53:49,242 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-09-30 10:53:49,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-30 10:53:49,242 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-09-30 10:53:49,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-09-30 10:53:49,243 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:53:49,243 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1] [2018-09-30 10:53:49,243 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:53:49,243 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:53:49,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1899204761, now seen corresponding path program 16 times [2018-09-30 10:53:49,244 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:53:49,244 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:53:49,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:53:49,245 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:53:49,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:53:49,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:53:49,645 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:53:49,645 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:53:49,645 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:53:49,652 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 10:53:49,676 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 10:53:49,676 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:53:49,679 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:53:49,869 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:53:49,889 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:53:49,889 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-09-30 10:53:49,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-30 10:53:49,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-30 10:53:49,890 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:53:49,890 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 19 states. [2018-09-30 10:53:51,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:53:51,090 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-09-30 10:53:51,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-30 10:53:51,094 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2018-09-30 10:53:51,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:53:51,094 INFO L225 Difference]: With dead ends: 41 [2018-09-30 10:53:51,094 INFO L226 Difference]: Without dead ends: 39 [2018-09-30 10:53:51,095 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:53:51,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-30 10:53:51,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-09-30 10:53:51,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-30 10:53:51,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-09-30 10:53:51,101 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-09-30 10:53:51,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:53:51,103 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-09-30 10:53:51,103 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-30 10:53:51,103 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-09-30 10:53:51,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-30 10:53:51,103 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:53:51,104 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1] [2018-09-30 10:53:51,104 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:53:51,104 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:53:51,104 INFO L82 PathProgramCache]: Analyzing trace with hash 225377569, now seen corresponding path program 17 times [2018-09-30 10:53:51,104 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:53:51,106 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:53:51,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:53:51,107 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:53:51,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:53:51,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:53:52,076 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:53:52,076 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:53:52,076 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:53:52,084 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 10:55:34,626 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-09-30 10:55:34,626 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:55:35,614 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:55:35,758 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:55:35,763 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:55:35,763 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-09-30 10:55:35,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-30 10:55:35,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-30 10:55:35,764 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-30 10:55:35,764 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 20 states. [2018-09-30 10:55:37,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:55:37,123 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-09-30 10:55:37,123 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-30 10:55:37,124 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2018-09-30 10:55:37,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:55:37,124 INFO L225 Difference]: With dead ends: 43 [2018-09-30 10:55:37,124 INFO L226 Difference]: Without dead ends: 41 [2018-09-30 10:55:37,125 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-30 10:55:37,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-09-30 10:55:37,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-09-30 10:55:37,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-09-30 10:55:37,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-09-30 10:55:37,132 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-09-30 10:55:37,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:55:37,132 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-09-30 10:55:37,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-30 10:55:37,132 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-09-30 10:55:37,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-09-30 10:55:37,133 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:55:37,133 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1] [2018-09-30 10:55:37,133 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:55:37,134 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-30 10:55:37,134 INFO L82 PathProgramCache]: Analyzing trace with hash 1839531099, now seen corresponding path program 18 times [2018-09-30 10:55:37,134 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:55:37,134 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:55:37,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:55:37,135 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:55:37,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:55:37,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:55:37,721 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:55:37,721 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:55:37,721 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:55:37,728 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown