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.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/diamond1.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-b2fde6a [2018-09-28 10:03:52,093 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-28 10:03:52,095 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-28 10:03:52,107 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-28 10:03:52,108 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-28 10:03:52,109 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-28 10:03:52,110 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-28 10:03:52,112 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-28 10:03:52,114 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-28 10:03:52,115 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-28 10:03:52,116 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-28 10:03:52,116 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-28 10:03:52,117 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-28 10:03:52,118 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-28 10:03:52,119 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-28 10:03:52,120 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-28 10:03:52,121 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-28 10:03:52,123 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-28 10:03:52,125 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-28 10:03:52,126 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-28 10:03:52,127 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-28 10:03:52,129 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-28 10:03:52,131 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-09-28 10:03:52,131 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-09-28 10:03:52,132 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-09-28 10:03:52,132 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-09-28 10:03:52,133 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-09-28 10:03:52,134 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-09-28 10:03:52,135 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-09-28 10:03:52,136 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-09-28 10:03:52,137 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-09-28 10:03:52,137 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-09-28 10:03:52,140 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf [2018-09-28 10:03:52,171 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-28 10:03:52,172 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-28 10:03:52,173 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-28 10:03:52,173 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-28 10:03:52,174 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-28 10:03:52,174 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-28 10:03:52,175 INFO L133 SettingsManager]: * Use SBE=true [2018-09-28 10:03:52,175 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-28 10:03:52,175 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-28 10:03:52,176 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-28 10:03:52,176 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-28 10:03:52,177 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-28 10:03:52,177 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-28 10:03:52,177 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-28 10:03:52,177 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-28 10:03:52,177 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-28 10:03:52,178 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-28 10:03:52,178 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-28 10:03:52,178 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-28 10:03:52,178 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-28 10:03:52,180 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-28 10:03:52,180 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-28 10:03:52,180 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-28 10:03:52,180 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-28 10:03:52,181 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-28 10:03:52,181 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-28 10:03:52,181 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-28 10:03:52,181 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-28 10:03:52,181 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-28 10:03:52,181 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-28 10:03:52,227 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-28 10:03:52,240 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-28 10:03:52,244 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-28 10:03:52,246 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-28 10:03:52,246 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-28 10:03:52,247 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/diamond1.i_3.bpl [2018-09-28 10:03:52,248 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/diamond1.i_3.bpl' [2018-09-28 10:03:52,301 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-28 10:03:52,304 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-28 10:03:52,305 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-28 10:03:52,305 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-28 10:03:52,305 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-28 10:03:52,327 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.09 10:03:52" (1/1) ... [2018-09-28 10:03:52,340 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.09 10:03:52" (1/1) ... [2018-09-28 10:03:52,347 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-28 10:03:52,348 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-28 10:03:52,348 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-28 10:03:52,348 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-28 10:03:52,360 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.09 10:03:52" (1/1) ... [2018-09-28 10:03:52,360 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.09 10:03:52" (1/1) ... [2018-09-28 10:03:52,361 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.09 10:03:52" (1/1) ... [2018-09-28 10:03:52,362 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.09 10:03:52" (1/1) ... [2018-09-28 10:03:52,365 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.09 10:03:52" (1/1) ... [2018-09-28 10:03:52,367 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.09 10:03:52" (1/1) ... [2018-09-28 10:03:52,368 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.09 10:03:52" (1/1) ... [2018-09-28 10:03:52,369 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-28 10:03:52,370 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-28 10:03:52,370 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-28 10:03:52,370 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-28 10:03:52,372 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.09 10:03:52" (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 [2018-09-28 10:03:52,451 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-28 10:03:52,451 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-28 10:03:52,645 INFO L353 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-28 10:03:52,647 INFO L202 PluginConnector]: Adding new model diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.09 10:03:52 BoogieIcfgContainer [2018-09-28 10:03:52,647 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-28 10:03:52,648 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-28 10:03:52,648 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-28 10:03:52,652 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-28 10:03:52,653 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.09 10:03:52" (1/2) ... [2018-09-28 10:03:52,655 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1374654b and model type diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.09 10:03:52, skipping insertion in model container [2018-09-28 10:03:52,655 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.09 10:03:52" (2/2) ... [2018-09-28 10:03:52,657 INFO L112 eAbstractionObserver]: Analyzing ICFG diamond1.i_3.bpl [2018-09-28 10:03:52,668 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-28 10:03:52,679 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-28 10:03:52,728 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-28 10:03:52,729 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-28 10:03:52,729 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-28 10:03:52,729 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-28 10:03:52,729 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-28 10:03:52,729 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-28 10:03:52,730 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-28 10:03:52,730 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-28 10:03:52,730 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-28 10:03:52,746 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-09-28 10:03:52,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-28 10:03:52,754 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:03:52,755 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-28 10:03:52,756 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:03:52,765 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:03:52,766 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-09-28 10:03:52,768 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:03:52,769 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:03:52,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:52,816 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-28 10:03:52,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:52,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:03:52,977 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:52,979 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-28 10:03:52,979 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-28 10:03:52,983 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-28 10:03:52,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-28 10:03:52,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-28 10:03:52,998 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-09-28 10:03:53,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:03:53,065 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-09-28 10:03:53,065 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-28 10:03:53,067 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-09-28 10:03:53,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:03:53,077 INFO L225 Difference]: With dead ends: 11 [2018-09-28 10:03:53,077 INFO L226 Difference]: Without dead ends: 7 [2018-09-28 10:03:53,081 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-28 10:03:53,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-09-28 10:03:53,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-09-28 10:03:53,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-09-28 10:03:53,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-09-28 10:03:53,114 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-09-28 10:03:53,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:03:53,115 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-09-28 10:03:53,115 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-28 10:03:53,115 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-09-28 10:03:53,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-28 10:03:53,115 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:03:53,116 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-09-28 10:03:53,116 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:03:53,116 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:03:53,117 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-09-28 10:03:53,117 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:03:53,117 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:03:53,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:53,118 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-28 10:03:53,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:53,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:03:53,319 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:53,319 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:03:53,319 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 [2018-09-28 10:03:53,349 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-28 10:03:53,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:03:53,375 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:03:53,420 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:53,454 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:03:53,454 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-09-28 10:03:53,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-28 10:03:53,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-28 10:03:53,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-09-28 10:03:53,456 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-09-28 10:03:53,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:03:53,568 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-09-28 10:03:53,569 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-28 10:03:53,569 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-09-28 10:03:53,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:03:53,570 INFO L225 Difference]: With dead ends: 11 [2018-09-28 10:03:53,570 INFO L226 Difference]: Without dead ends: 9 [2018-09-28 10:03:53,572 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-09-28 10:03:53,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-28 10:03:53,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-28 10:03:53,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-28 10:03:53,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-09-28 10:03:53,575 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-09-28 10:03:53,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:03:53,576 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-09-28 10:03:53,576 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-28 10:03:53,576 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-09-28 10:03:53,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-28 10:03:53,578 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:03:53,579 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-09-28 10:03:53,579 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:03:53,579 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:03:53,579 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-09-28 10:03:53,580 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:03:53,580 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:03:53,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:53,581 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-28 10:03:53,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:53,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:03:53,886 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:53,886 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:03:53,886 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 [2018-09-28 10:03:53,902 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-28 10:03:53,927 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-28 10:03:53,928 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:03:53,929 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:03:53,976 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:54,007 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:03:54,007 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-09-28 10:03:54,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-28 10:03:54,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-28 10:03:54,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-28 10:03:54,009 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-09-28 10:03:54,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:03:54,131 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-09-28 10:03:54,132 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-28 10:03:54,132 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-09-28 10:03:54,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:03:54,132 INFO L225 Difference]: With dead ends: 13 [2018-09-28 10:03:54,133 INFO L226 Difference]: Without dead ends: 11 [2018-09-28 10:03:54,133 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-28 10:03:54,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-28 10:03:54,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-28 10:03:54,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-28 10:03:54,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-09-28 10:03:54,140 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-09-28 10:03:54,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:03:54,140 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-09-28 10:03:54,140 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-28 10:03:54,141 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-09-28 10:03:54,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-28 10:03:54,141 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:03:54,141 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-09-28 10:03:54,142 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:03:54,142 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:03:54,143 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-09-28 10:03:54,143 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:03:54,143 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:03:54,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:54,145 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:03:54,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:54,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:03:54,514 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:54,514 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:03:54,515 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 [2018-09-28 10:03:54,525 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-28 10:03:54,555 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-28 10:03:54,556 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:03:54,557 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:03:54,599 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:54,620 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:03:54,621 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-09-28 10:03:54,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-28 10:03:54,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-28 10:03:54,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-28 10:03:54,623 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-09-28 10:03:54,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:03:54,683 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-09-28 10:03:54,684 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-28 10:03:54,684 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-09-28 10:03:54,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:03:54,685 INFO L225 Difference]: With dead ends: 15 [2018-09-28 10:03:54,685 INFO L226 Difference]: Without dead ends: 13 [2018-09-28 10:03:54,686 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-28 10:03:54,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-28 10:03:54,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-28 10:03:54,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-28 10:03:54,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-09-28 10:03:54,690 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-09-28 10:03:54,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:03:54,691 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-09-28 10:03:54,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-28 10:03:54,691 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-09-28 10:03:54,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-09-28 10:03:54,692 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:03:54,692 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-09-28 10:03:54,692 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:03:54,692 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:03:54,692 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-09-28 10:03:54,692 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:03:54,693 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:03:54,693 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:54,693 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:03:54,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:54,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:03:54,820 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:54,820 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:03:54,820 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 [2018-09-28 10:03:54,828 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-28 10:03:54,865 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-28 10:03:54,866 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:03:54,868 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:03:54,894 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:54,915 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:03:54,915 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-28 10:03:54,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-28 10:03:54,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-28 10:03:54,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-28 10:03:54,916 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-09-28 10:03:55,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:03:55,021 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-09-28 10:03:55,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-28 10:03:55,023 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-09-28 10:03:55,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:03:55,024 INFO L225 Difference]: With dead ends: 17 [2018-09-28 10:03:55,024 INFO L226 Difference]: Without dead ends: 15 [2018-09-28 10:03:55,025 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-28 10:03:55,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-28 10:03:55,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-28 10:03:55,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-28 10:03:55,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-09-28 10:03:55,030 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-09-28 10:03:55,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:03:55,030 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-09-28 10:03:55,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-28 10:03:55,030 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-09-28 10:03:55,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-28 10:03:55,031 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:03:55,031 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-09-28 10:03:55,031 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:03:55,032 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:03:55,032 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-09-28 10:03:55,032 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:03:55,032 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:03:55,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:55,033 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:03:55,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:55,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:03:55,284 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:55,284 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:03:55,285 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 [2018-09-28 10:03:55,297 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-28 10:03:55,389 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-28 10:03:55,389 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:03:55,392 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:03:55,441 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:55,469 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:03:55,470 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-09-28 10:03:55,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-28 10:03:55,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-28 10:03:55,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-28 10:03:55,471 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-09-28 10:03:55,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:03:55,536 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-28 10:03:55,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-28 10:03:55,536 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-09-28 10:03:55,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:03:55,537 INFO L225 Difference]: With dead ends: 19 [2018-09-28 10:03:55,537 INFO L226 Difference]: Without dead ends: 17 [2018-09-28 10:03:55,538 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-28 10:03:55,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-28 10:03:55,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-28 10:03:55,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-28 10:03:55,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-28 10:03:55,543 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-09-28 10:03:55,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:03:55,544 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-28 10:03:55,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-28 10:03:55,544 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-28 10:03:55,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-09-28 10:03:55,545 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:03:55,545 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-09-28 10:03:55,545 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:03:55,545 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:03:55,545 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-09-28 10:03:55,546 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:03:55,546 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:03:55,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:55,547 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:03:55,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:55,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:03:56,111 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:56,112 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:03:56,112 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 [2018-09-28 10:03:56,126 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-28 10:03:56,169 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-28 10:03:56,170 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:03:56,172 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:03:56,198 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:56,220 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:03:56,220 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-09-28 10:03:56,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-28 10:03:56,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-28 10:03:56,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-28 10:03:56,221 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-09-28 10:03:56,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:03:56,322 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-28 10:03:56,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-28 10:03:56,326 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-09-28 10:03:56,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:03:56,327 INFO L225 Difference]: With dead ends: 21 [2018-09-28 10:03:56,327 INFO L226 Difference]: Without dead ends: 19 [2018-09-28 10:03:56,327 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-28 10:03:56,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-28 10:03:56,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-28 10:03:56,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-28 10:03:56,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-28 10:03:56,332 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-09-28 10:03:56,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:03:56,332 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-28 10:03:56,332 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-28 10:03:56,333 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-28 10:03:56,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-28 10:03:56,333 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:03:56,333 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-09-28 10:03:56,334 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:03:56,334 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:03:56,334 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-09-28 10:03:56,334 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:03:56,334 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:03:56,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:56,335 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:03:56,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:56,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:03:56,978 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:56,979 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:03:56,979 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 [2018-09-28 10:03:56,988 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-28 10:03:57,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:03:57,016 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:03:57,036 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:57,058 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:03:57,058 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-28 10:03:57,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-28 10:03:57,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-28 10:03:57,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-28 10:03:57,059 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-09-28 10:03:57,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:03:57,150 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-28 10:03:57,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-28 10:03:57,151 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-09-28 10:03:57,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:03:57,152 INFO L225 Difference]: With dead ends: 23 [2018-09-28 10:03:57,152 INFO L226 Difference]: Without dead ends: 21 [2018-09-28 10:03:57,153 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-28 10:03:57,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-28 10:03:57,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-09-28 10:03:57,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-28 10:03:57,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-09-28 10:03:57,159 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-09-28 10:03:57,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:03:57,159 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-09-28 10:03:57,159 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-28 10:03:57,159 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-09-28 10:03:57,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-28 10:03:57,160 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:03:57,160 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-09-28 10:03:57,160 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:03:57,161 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:03:57,161 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-09-28 10:03:57,161 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:03:57,161 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:03:57,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:57,162 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-28 10:03:57,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:57,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:03:57,495 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:57,496 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:03:57,496 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 [2018-09-28 10:03:57,504 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-28 10:03:57,529 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-28 10:03:57,529 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:03:57,531 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:03:57,543 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:57,563 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:03:57,564 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-09-28 10:03:57,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-28 10:03:57,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-28 10:03:57,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-09-28 10:03:57,565 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-09-28 10:03:57,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:03:57,751 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-28 10:03:57,752 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-28 10:03:57,752 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-09-28 10:03:57,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:03:57,753 INFO L225 Difference]: With dead ends: 25 [2018-09-28 10:03:57,754 INFO L226 Difference]: Without dead ends: 23 [2018-09-28 10:03:57,754 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-09-28 10:03:57,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-28 10:03:57,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-28 10:03:57,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-28 10:03:57,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-09-28 10:03:57,759 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-09-28 10:03:57,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:03:57,760 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-09-28 10:03:57,760 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-28 10:03:57,760 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-09-28 10:03:57,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-28 10:03:57,761 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:03:57,761 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-09-28 10:03:57,761 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:03:57,762 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:03:57,762 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-09-28 10:03:57,762 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:03:57,762 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:03:57,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:57,763 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:03:57,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:57,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:03:57,966 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:57,967 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:03:57,967 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 [2018-09-28 10:03:57,978 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-28 10:03:58,882 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-28 10:03:58,882 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:03:58,885 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:03:58,896 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:58,917 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:03:58,917 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-09-28 10:03:58,918 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-28 10:03:58,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-28 10:03:58,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-28 10:03:58,918 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 12 states. [2018-09-28 10:03:59,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:03:59,057 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-28 10:03:59,058 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-28 10:03:59,058 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2018-09-28 10:03:59,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:03:59,059 INFO L225 Difference]: With dead ends: 27 [2018-09-28 10:03:59,059 INFO L226 Difference]: Without dead ends: 25 [2018-09-28 10:03:59,059 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-28 10:03:59,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-09-28 10:03:59,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-09-28 10:03:59,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-09-28 10:03:59,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-09-28 10:03:59,065 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-09-28 10:03:59,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:03:59,065 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-09-28 10:03:59,065 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-28 10:03:59,066 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-09-28 10:03:59,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-09-28 10:03:59,066 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:03:59,066 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1] [2018-09-28 10:03:59,067 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:03:59,067 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:03:59,067 INFO L82 PathProgramCache]: Analyzing trace with hash -1724181365, now seen corresponding path program 10 times [2018-09-28 10:03:59,067 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:03:59,067 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:03:59,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:59,068 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:03:59,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:59,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:03:59,292 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:59,293 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:03:59,293 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 [2018-09-28 10:03:59,301 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-28 10:03:59,333 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-28 10:03:59,334 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:03:59,336 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:03:59,405 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:03:59,438 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:03:59,438 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-09-28 10:03:59,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-28 10:03:59,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-28 10:03:59,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-09-28 10:03:59,439 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 13 states. [2018-09-28 10:03:59,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:03:59,833 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-28 10:03:59,833 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-28 10:03:59,833 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-09-28 10:03:59,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:03:59,835 INFO L225 Difference]: With dead ends: 29 [2018-09-28 10:03:59,835 INFO L226 Difference]: Without dead ends: 27 [2018-09-28 10:03:59,836 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-09-28 10:03:59,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-28 10:03:59,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-28 10:03:59,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-28 10:03:59,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-09-28 10:03:59,841 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-09-28 10:03:59,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:03:59,842 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-09-28 10:03:59,842 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-28 10:03:59,842 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-09-28 10:03:59,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-28 10:03:59,843 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:03:59,843 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1] [2018-09-28 10:03:59,843 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:03:59,843 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:03:59,844 INFO L82 PathProgramCache]: Analyzing trace with hash 919136581, now seen corresponding path program 11 times [2018-09-28 10:03:59,844 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:03:59,844 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:03:59,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:59,845 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:03:59,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:03:59,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:04:00,380 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:00,381 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:04:00,381 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 [2018-09-28 10:04:00,393 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-28 10:04:00,525 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-28 10:04:00,525 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:04:00,528 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:04:00,559 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:00,589 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:04:00,589 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-09-28 10:04:00,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-28 10:04:00,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-28 10:04:00,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-28 10:04:00,591 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 14 states. [2018-09-28 10:04:00,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:04:00,739 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-28 10:04:00,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-28 10:04:00,742 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 26 [2018-09-28 10:04:00,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:04:00,743 INFO L225 Difference]: With dead ends: 31 [2018-09-28 10:04:00,743 INFO L226 Difference]: Without dead ends: 29 [2018-09-28 10:04:00,744 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-28 10:04:00,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-28 10:04:00,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-09-28 10:04:00,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-28 10:04:00,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-09-28 10:04:00,750 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-09-28 10:04:00,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:04:00,750 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-09-28 10:04:00,750 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-28 10:04:00,750 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-09-28 10:04:00,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-09-28 10:04:00,751 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:04:00,751 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1] [2018-09-28 10:04:00,751 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:04:00,752 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:04:00,752 INFO L82 PathProgramCache]: Analyzing trace with hash -1472956545, now seen corresponding path program 12 times [2018-09-28 10:04:00,752 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:04:00,752 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:04:00,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:00,753 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:04:00,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:00,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:04:01,145 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:01,146 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:04:01,146 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 [2018-09-28 10:04:01,153 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-28 10:04:02,214 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-28 10:04:02,215 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:04:02,219 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:04:02,252 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:02,285 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:04:02,285 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-09-28 10:04:02,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-28 10:04:02,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-28 10:04:02,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-28 10:04:02,286 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2018-09-28 10:04:02,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:04:02,595 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-28 10:04:02,596 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-28 10:04:02,596 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2018-09-28 10:04:02,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:04:02,597 INFO L225 Difference]: With dead ends: 33 [2018-09-28 10:04:02,597 INFO L226 Difference]: Without dead ends: 31 [2018-09-28 10:04:02,598 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-28 10:04:02,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-28 10:04:02,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-28 10:04:02,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-28 10:04:02,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-09-28 10:04:02,603 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-09-28 10:04:02,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:04:02,604 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-09-28 10:04:02,604 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-28 10:04:02,604 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-09-28 10:04:02,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-28 10:04:02,605 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:04:02,605 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1] [2018-09-28 10:04:02,605 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:04:02,605 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:04:02,605 INFO L82 PathProgramCache]: Analyzing trace with hash 1828020025, now seen corresponding path program 13 times [2018-09-28 10:04:02,606 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:04:02,606 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:04:02,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:02,607 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:04:02,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:02,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:04:02,936 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:02,936 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:04:02,937 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 [2018-09-28 10:04:02,947 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-28 10:04:02,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:04:02,966 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:04:02,987 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:03,008 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:04:03,008 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-28 10:04:03,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-28 10:04:03,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-28 10:04:03,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-28 10:04:03,009 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 16 states. [2018-09-28 10:04:03,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:04:03,200 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-28 10:04:03,201 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-28 10:04:03,201 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2018-09-28 10:04:03,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:04:03,202 INFO L225 Difference]: With dead ends: 35 [2018-09-28 10:04:03,202 INFO L226 Difference]: Without dead ends: 33 [2018-09-28 10:04:03,203 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-28 10:04:03,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-28 10:04:03,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-09-28 10:04:03,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-28 10:04:03,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-28 10:04:03,208 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-09-28 10:04:03,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:04:03,209 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-28 10:04:03,209 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-28 10:04:03,209 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-28 10:04:03,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-28 10:04:03,210 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:04:03,210 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1] [2018-09-28 10:04:03,210 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:04:03,210 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:04:03,210 INFO L82 PathProgramCache]: Analyzing trace with hash 85672051, now seen corresponding path program 14 times [2018-09-28 10:04:03,211 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:04:03,211 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:04:03,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:03,212 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-28 10:04:03,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:03,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:04:03,882 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:03,882 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:04:03,883 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 [2018-09-28 10:04:03,893 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-28 10:04:03,908 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-28 10:04:03,908 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:04:03,910 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:04:03,939 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:03,971 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:04:03,971 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-09-28 10:04:03,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-28 10:04:03,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-28 10:04:03,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-09-28 10:04:03,972 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 17 states. [2018-09-28 10:04:04,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:04:04,372 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-09-28 10:04:04,372 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-28 10:04:04,372 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-09-28 10:04:04,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:04:04,373 INFO L225 Difference]: With dead ends: 37 [2018-09-28 10:04:04,373 INFO L226 Difference]: Without dead ends: 35 [2018-09-28 10:04:04,374 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-09-28 10:04:04,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-09-28 10:04:04,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-09-28 10:04:04,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-28 10:04:04,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-09-28 10:04:04,380 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-09-28 10:04:04,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:04:04,380 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-09-28 10:04:04,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-28 10:04:04,380 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-09-28 10:04:04,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-28 10:04:04,381 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:04:04,381 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1] [2018-09-28 10:04:04,382 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:04:04,382 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:04:04,382 INFO L82 PathProgramCache]: Analyzing trace with hash 726514477, now seen corresponding path program 15 times [2018-09-28 10:04:04,382 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:04:04,382 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:04:04,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:04,383 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:04:04,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:04,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:04:04,662 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:04,663 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:04:04,663 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 [2018-09-28 10:04:04,671 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-28 10:04:05,948 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-28 10:04:05,948 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:04:05,963 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:04:05,992 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:06,023 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:04:06,023 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-09-28 10:04:06,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-28 10:04:06,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-28 10:04:06,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-28 10:04:06,024 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 18 states. [2018-09-28 10:04:06,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:04:06,297 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-28 10:04:06,299 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-28 10:04:06,300 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2018-09-28 10:04:06,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:04:06,300 INFO L225 Difference]: With dead ends: 39 [2018-09-28 10:04:06,300 INFO L226 Difference]: Without dead ends: 37 [2018-09-28 10:04:06,301 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-28 10:04:06,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-28 10:04:06,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-09-28 10:04:06,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-09-28 10:04:06,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-09-28 10:04:06,306 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-09-28 10:04:06,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:04:06,306 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-09-28 10:04:06,307 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-28 10:04:06,307 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-09-28 10:04:06,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-09-28 10:04:06,307 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:04:06,307 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1] [2018-09-28 10:04:06,308 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:04:06,308 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:04:06,308 INFO L82 PathProgramCache]: Analyzing trace with hash -1899204761, now seen corresponding path program 16 times [2018-09-28 10:04:06,308 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:04:06,308 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:04:06,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:06,309 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:04:06,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:06,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:04:06,771 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:06,771 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:04:06,772 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 [2018-09-28 10:04:06,782 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-28 10:04:06,812 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-28 10:04:06,813 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:04:06,815 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:04:06,858 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:06,886 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:04:06,886 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-09-28 10:04:06,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-28 10:04:06,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-28 10:04:06,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-09-28 10:04:06,888 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 19 states. [2018-09-28 10:04:07,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:04:07,228 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-09-28 10:04:07,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-28 10:04:07,234 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2018-09-28 10:04:07,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:04:07,234 INFO L225 Difference]: With dead ends: 41 [2018-09-28 10:04:07,235 INFO L226 Difference]: Without dead ends: 39 [2018-09-28 10:04:07,235 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-09-28 10:04:07,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-28 10:04:07,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-09-28 10:04:07,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-28 10:04:07,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-09-28 10:04:07,245 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-09-28 10:04:07,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:04:07,245 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-09-28 10:04:07,245 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-28 10:04:07,245 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-09-28 10:04:07,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-28 10:04:07,246 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:04:07,246 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1] [2018-09-28 10:04:07,247 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:04:07,247 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:04:07,247 INFO L82 PathProgramCache]: Analyzing trace with hash 225377569, now seen corresponding path program 17 times [2018-09-28 10:04:07,247 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:04:07,247 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:04:07,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:07,248 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:04:07,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:07,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:04:07,606 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:07,607 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:04:07,607 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 [2018-09-28 10:04:07,616 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-28 10:04:48,115 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-09-28 10:04:48,115 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:04:48,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:04:48,712 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:48,732 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:04:48,733 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-09-28 10:04:48,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-28 10:04:48,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-28 10:04:48,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-09-28 10:04:48,734 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 20 states. [2018-09-28 10:04:49,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:04:49,039 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-09-28 10:04:49,040 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-28 10:04:49,040 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2018-09-28 10:04:49,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:04:49,041 INFO L225 Difference]: With dead ends: 43 [2018-09-28 10:04:49,041 INFO L226 Difference]: Without dead ends: 41 [2018-09-28 10:04:49,042 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-09-28 10:04:49,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-09-28 10:04:49,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-09-28 10:04:49,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-09-28 10:04:49,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-09-28 10:04:49,048 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-09-28 10:04:49,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:04:49,049 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-09-28 10:04:49,049 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-28 10:04:49,049 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-09-28 10:04:49,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-09-28 10:04:49,050 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:04:49,050 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1] [2018-09-28 10:04:49,050 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:04:49,050 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:04:49,050 INFO L82 PathProgramCache]: Analyzing trace with hash 1839531099, now seen corresponding path program 18 times [2018-09-28 10:04:49,050 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:04:49,051 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:04:49,051 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:49,052 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:04:49,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:49,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:04:49,375 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:49,375 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:04:49,375 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 [2018-09-28 10:04:49,389 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-28 10:04:50,509 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-09-28 10:04:50,509 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:04:50,516 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:04:50,544 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:50,565 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:04:50,565 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2018-09-28 10:04:50,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-09-28 10:04:50,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-09-28 10:04:50,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-09-28 10:04:50,567 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 21 states. [2018-09-28 10:04:51,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:04:51,343 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-09-28 10:04:51,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-09-28 10:04:51,344 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2018-09-28 10:04:51,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:04:51,345 INFO L225 Difference]: With dead ends: 45 [2018-09-28 10:04:51,345 INFO L226 Difference]: Without dead ends: 43 [2018-09-28 10:04:51,346 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-09-28 10:04:51,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-09-28 10:04:51,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-09-28 10:04:51,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-09-28 10:04:51,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-09-28 10:04:51,353 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2018-09-28 10:04:51,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:04:51,353 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-09-28 10:04:51,353 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-09-28 10:04:51,353 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-09-28 10:04:51,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-09-28 10:04:51,354 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:04:51,354 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1] [2018-09-28 10:04:51,355 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:04:51,355 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:04:51,355 INFO L82 PathProgramCache]: Analyzing trace with hash -1737087723, now seen corresponding path program 19 times [2018-09-28 10:04:51,355 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:04:51,355 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:04:51,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:51,356 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:04:51,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:51,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:04:52,294 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:52,295 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:04:52,295 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-28 10:04:52,303 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-28 10:04:52,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:04:52,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:04:52,365 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:52,391 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:04:52,391 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-09-28 10:04:52,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-28 10:04:52,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-28 10:04:52,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-09-28 10:04:52,392 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 22 states. [2018-09-28 10:04:52,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:04:52,899 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-09-28 10:04:52,899 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-09-28 10:04:52,900 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 42 [2018-09-28 10:04:52,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:04:52,900 INFO L225 Difference]: With dead ends: 47 [2018-09-28 10:04:52,901 INFO L226 Difference]: Without dead ends: 45 [2018-09-28 10:04:52,901 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-09-28 10:04:52,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-09-28 10:04:52,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-09-28 10:04:52,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-09-28 10:04:52,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-09-28 10:04:52,908 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2018-09-28 10:04:52,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:04:52,908 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-09-28 10:04:52,909 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-28 10:04:52,909 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-09-28 10:04:52,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-09-28 10:04:52,909 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:04:52,909 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1] [2018-09-28 10:04:52,910 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:04:52,910 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:04:52,910 INFO L82 PathProgramCache]: Analyzing trace with hash 1401028431, now seen corresponding path program 20 times [2018-09-28 10:04:52,910 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:04:52,910 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:04:52,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:52,911 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-28 10:04:52,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:52,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:04:53,619 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:53,619 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:04:53,619 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-28 10:04:53,633 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-28 10:04:53,654 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-28 10:04:53,654 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:04:53,656 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:04:53,675 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:53,696 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:04:53,696 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-09-28 10:04:53,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-09-28 10:04:53,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-09-28 10:04:53,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-09-28 10:04:53,697 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 23 states. [2018-09-28 10:04:54,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:04:54,043 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-09-28 10:04:54,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-09-28 10:04:54,043 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 44 [2018-09-28 10:04:54,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:04:54,044 INFO L225 Difference]: With dead ends: 49 [2018-09-28 10:04:54,044 INFO L226 Difference]: Without dead ends: 47 [2018-09-28 10:04:54,044 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-09-28 10:04:54,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-09-28 10:04:54,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-09-28 10:04:54,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-09-28 10:04:54,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-09-28 10:04:54,050 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2018-09-28 10:04:54,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:04:54,050 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-09-28 10:04:54,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-09-28 10:04:54,050 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-09-28 10:04:54,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-09-28 10:04:54,051 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:04:54,051 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1] [2018-09-28 10:04:54,051 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:04:54,051 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:04:54,052 INFO L82 PathProgramCache]: Analyzing trace with hash 2063610633, now seen corresponding path program 21 times [2018-09-28 10:04:54,052 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:04:54,052 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:04:54,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:54,053 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:04:54,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:54,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:04:54,701 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:54,701 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:04:54,701 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-28 10:04:54,708 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-28 10:04:57,081 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-09-28 10:04:57,081 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:04:57,139 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:04:57,173 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:57,193 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:04:57,193 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-09-28 10:04:57,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-09-28 10:04:57,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-09-28 10:04:57,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-09-28 10:04:57,194 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 24 states. [2018-09-28 10:04:57,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:04:57,551 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-09-28 10:04:57,553 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-09-28 10:04:57,553 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2018-09-28 10:04:57,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:04:57,554 INFO L225 Difference]: With dead ends: 51 [2018-09-28 10:04:57,554 INFO L226 Difference]: Without dead ends: 49 [2018-09-28 10:04:57,555 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-09-28 10:04:57,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-09-28 10:04:57,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-09-28 10:04:57,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-09-28 10:04:57,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-09-28 10:04:57,560 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2018-09-28 10:04:57,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:04:57,560 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-09-28 10:04:57,560 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-09-28 10:04:57,560 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-09-28 10:04:57,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-09-28 10:04:57,561 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:04:57,561 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1] [2018-09-28 10:04:57,561 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:04:57,561 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:04:57,562 INFO L82 PathProgramCache]: Analyzing trace with hash -1145020349, now seen corresponding path program 22 times [2018-09-28 10:04:57,562 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:04:57,562 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:04:57,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:57,562 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:04:57,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:57,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:04:58,659 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:58,659 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:04:58,659 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-28 10:04:58,668 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-28 10:04:58,702 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-28 10:04:58,703 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:04:58,706 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:04:58,743 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:58,767 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:04:58,767 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 24 [2018-09-28 10:04:58,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-09-28 10:04:58,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-09-28 10:04:58,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-09-28 10:04:58,768 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 25 states. [2018-09-28 10:04:59,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:04:59,159 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-09-28 10:04:59,159 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-09-28 10:04:59,159 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 48 [2018-09-28 10:04:59,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:04:59,160 INFO L225 Difference]: With dead ends: 53 [2018-09-28 10:04:59,160 INFO L226 Difference]: Without dead ends: 51 [2018-09-28 10:04:59,161 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-09-28 10:04:59,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-09-28 10:04:59,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-09-28 10:04:59,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-09-28 10:04:59,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-09-28 10:04:59,166 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2018-09-28 10:04:59,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:04:59,166 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-09-28 10:04:59,166 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-09-28 10:04:59,166 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-09-28 10:04:59,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-09-28 10:04:59,167 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:04:59,167 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1] [2018-09-28 10:04:59,167 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:04:59,167 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:04:59,167 INFO L82 PathProgramCache]: Analyzing trace with hash -852875523, now seen corresponding path program 23 times [2018-09-28 10:04:59,167 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:04:59,168 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:04:59,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:59,168 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:04:59,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:04:59,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:04:59,665 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:04:59,665 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:04:59,665 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-28 10:04:59,676 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-28 10:06:28,162 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2018-09-28 10:06:28,162 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:06:28,480 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:06:28,510 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:06:28,540 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:06:28,540 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-09-28 10:06:28,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-09-28 10:06:28,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-09-28 10:06:28,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2018-09-28 10:06:28,541 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 26 states. [2018-09-28 10:06:29,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:06:29,001 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-09-28 10:06:29,002 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-09-28 10:06:29,002 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 50 [2018-09-28 10:06:29,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:06:29,003 INFO L225 Difference]: With dead ends: 55 [2018-09-28 10:06:29,003 INFO L226 Difference]: Without dead ends: 53 [2018-09-28 10:06:29,004 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2018-09-28 10:06:29,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-09-28 10:06:29,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-09-28 10:06:29,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-09-28 10:06:29,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-09-28 10:06:29,010 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2018-09-28 10:06:29,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:06:29,011 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-09-28 10:06:29,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-09-28 10:06:29,011 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-09-28 10:06:29,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-09-28 10:06:29,011 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:06:29,011 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 1, 1, 1] [2018-09-28 10:06:29,012 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:06:29,012 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:06:29,012 INFO L82 PathProgramCache]: Analyzing trace with hash 725428023, now seen corresponding path program 24 times [2018-09-28 10:06:29,012 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:06:29,012 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:06:29,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:06:29,013 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:06:29,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:06:29,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:06:30,735 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:06:30,735 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:06:30,735 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-28 10:06:30,743 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-28 10:07:11,211 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-09-28 10:07:11,211 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:07:11,258 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:07:11,605 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:07:11,626 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:07:11,626 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 26 [2018-09-28 10:07:11,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-09-28 10:07:11,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-09-28 10:07:11,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-09-28 10:07:11,627 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 27 states. [2018-09-28 10:07:12,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:07:12,062 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-09-28 10:07:12,062 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-09-28 10:07:12,062 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 52 [2018-09-28 10:07:12,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:07:12,063 INFO L225 Difference]: With dead ends: 57 [2018-09-28 10:07:12,063 INFO L226 Difference]: Without dead ends: 55 [2018-09-28 10:07:12,064 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 43 SyntacticMatches, 9 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-09-28 10:07:12,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-09-28 10:07:12,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-09-28 10:07:12,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-09-28 10:07:12,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-09-28 10:07:12,069 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2018-09-28 10:07:12,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:07:12,070 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-09-28 10:07:12,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-09-28 10:07:12,070 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-09-28 10:07:12,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-09-28 10:07:12,070 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:07:12,070 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 1, 1, 1] [2018-09-28 10:07:12,071 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:07:12,071 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:07:12,071 INFO L82 PathProgramCache]: Analyzing trace with hash 1351680241, now seen corresponding path program 25 times [2018-09-28 10:07:12,071 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:07:12,071 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:07:12,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:07:12,072 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:07:12,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:07:12,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:07:12,666 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:07:12,666 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:07:12,666 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-28 10:07:12,674 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-28 10:07:12,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:07:12,697 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:07:12,713 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:07:12,734 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:07:12,734 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 27 [2018-09-28 10:07:12,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-09-28 10:07:12,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-09-28 10:07:12,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2018-09-28 10:07:12,735 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 28 states. [2018-09-28 10:07:13,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:07:13,221 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-09-28 10:07:13,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-09-28 10:07:13,221 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 54 [2018-09-28 10:07:13,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:07:13,222 INFO L225 Difference]: With dead ends: 59 [2018-09-28 10:07:13,222 INFO L226 Difference]: Without dead ends: 57 [2018-09-28 10:07:13,223 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2018-09-28 10:07:13,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-09-28 10:07:13,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-09-28 10:07:13,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-09-28 10:07:13,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-09-28 10:07:13,228 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2018-09-28 10:07:13,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:07:13,228 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-09-28 10:07:13,228 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-09-28 10:07:13,228 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-09-28 10:07:13,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-09-28 10:07:13,229 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:07:13,229 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 1, 1, 1] [2018-09-28 10:07:13,229 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:07:13,229 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:07:13,229 INFO L82 PathProgramCache]: Analyzing trace with hash 1884640299, now seen corresponding path program 26 times [2018-09-28 10:07:13,229 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:07:13,229 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:07:13,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:07:13,230 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-28 10:07:13,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:07:13,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:07:14,084 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:07:14,084 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:07:14,084 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-28 10:07:14,092 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-28 10:07:14,117 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-28 10:07:14,118 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:07:14,119 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:07:14,140 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:07:14,160 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:07:14,160 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 28 [2018-09-28 10:07:14,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-09-28 10:07:14,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-09-28 10:07:14,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-09-28 10:07:14,161 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 29 states. [2018-09-28 10:07:14,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:07:14,677 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-09-28 10:07:14,677 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-09-28 10:07:14,678 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 56 [2018-09-28 10:07:14,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:07:14,678 INFO L225 Difference]: With dead ends: 61 [2018-09-28 10:07:14,679 INFO L226 Difference]: Without dead ends: 59 [2018-09-28 10:07:14,679 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-09-28 10:07:14,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-09-28 10:07:14,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-09-28 10:07:14,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-09-28 10:07:14,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-09-28 10:07:14,684 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2018-09-28 10:07:14,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:07:14,684 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-09-28 10:07:14,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-09-28 10:07:14,684 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-09-28 10:07:14,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-09-28 10:07:14,685 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:07:14,685 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 1, 1, 1] [2018-09-28 10:07:14,685 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:07:14,686 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:07:14,686 INFO L82 PathProgramCache]: Analyzing trace with hash -1336819483, now seen corresponding path program 27 times [2018-09-28 10:07:14,686 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:07:14,686 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:07:14,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:07:14,687 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:07:14,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:07:14,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:07:16,074 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:07:16,074 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:07:16,074 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-28 10:07:16,083 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-28 10:07:34,929 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-09-28 10:07:34,929 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:07:34,964 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:07:34,983 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:07:35,003 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:07:35,004 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 29 [2018-09-28 10:07:35,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-09-28 10:07:35,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-09-28 10:07:35,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2018-09-28 10:07:35,005 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 30 states. [2018-09-28 10:07:35,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:07:35,561 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-09-28 10:07:35,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-09-28 10:07:35,562 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 58 [2018-09-28 10:07:35,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:07:35,563 INFO L225 Difference]: With dead ends: 63 [2018-09-28 10:07:35,563 INFO L226 Difference]: Without dead ends: 61 [2018-09-28 10:07:35,564 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2018-09-28 10:07:35,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-09-28 10:07:35,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-09-28 10:07:35,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-09-28 10:07:35,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-09-28 10:07:35,569 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2018-09-28 10:07:35,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:07:35,569 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-09-28 10:07:35,569 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-09-28 10:07:35,569 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-09-28 10:07:35,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-09-28 10:07:35,570 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:07:35,570 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 1, 1, 1] [2018-09-28 10:07:35,570 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:07:35,570 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:07:35,571 INFO L82 PathProgramCache]: Analyzing trace with hash -488249569, now seen corresponding path program 28 times [2018-09-28 10:07:35,571 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:07:35,571 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:07:35,571 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:07:35,571 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:07:35,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:07:35,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:07:36,260 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:07:36,260 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:07:36,260 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-28 10:07:36,268 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-28 10:07:36,299 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-28 10:07:36,299 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-28 10:07:36,301 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-28 10:07:36,349 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:07:36,370 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-28 10:07:36,370 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 30 [2018-09-28 10:07:36,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-09-28 10:07:36,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-09-28 10:07:36,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-09-28 10:07:36,371 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 31 states. [2018-09-28 10:07:37,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-28 10:07:37,134 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2018-09-28 10:07:37,134 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-09-28 10:07:37,134 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 60 [2018-09-28 10:07:37,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-28 10:07:37,135 INFO L225 Difference]: With dead ends: 65 [2018-09-28 10:07:37,136 INFO L226 Difference]: Without dead ends: 63 [2018-09-28 10:07:37,137 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-09-28 10:07:37,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-09-28 10:07:37,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-09-28 10:07:37,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-09-28 10:07:37,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-09-28 10:07:37,142 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2018-09-28 10:07:37,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-28 10:07:37,142 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-09-28 10:07:37,142 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-09-28 10:07:37,142 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-09-28 10:07:37,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-09-28 10:07:37,143 INFO L367 BasicCegarLoop]: Found error trace [2018-09-28 10:07:37,143 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 1, 1, 1] [2018-09-28 10:07:37,143 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-28 10:07:37,144 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-28 10:07:37,144 INFO L82 PathProgramCache]: Analyzing trace with hash -1056348455, now seen corresponding path program 29 times [2018-09-28 10:07:37,144 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-28 10:07:37,144 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-28 10:07:37,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:07:37,145 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-28 10:07:37,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-28 10:07:37,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-28 10:07:38,133 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-28 10:07:38,134 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-28 10:07:38,134 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-28 10:07:38,141 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown