java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/overflow_true-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-0fd1304 [2018-10-23 15:48:43,241 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-23 15:48:43,243 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-23 15:48:43,255 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-23 15:48:43,255 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-23 15:48:43,256 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-23 15:48:43,258 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-23 15:48:43,260 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-23 15:48:43,262 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-23 15:48:43,262 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-23 15:48:43,263 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-23 15:48:43,264 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-23 15:48:43,265 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-23 15:48:43,266 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-23 15:48:43,267 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-23 15:48:43,268 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-23 15:48:43,269 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-23 15:48:43,271 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-23 15:48:43,273 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-23 15:48:43,275 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-23 15:48:43,276 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-23 15:48:43,277 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-23 15:48:43,280 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-23 15:48:43,280 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-23 15:48:43,281 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-23 15:48:43,281 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-23 15:48:43,282 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-23 15:48:43,283 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-23 15:48:43,284 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-23 15:48:43,285 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-23 15:48:43,286 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-23 15:48:43,286 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-23 15:48:43,289 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf [2018-10-23 15:48:43,305 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-23 15:48:43,305 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-23 15:48:43,306 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-23 15:48:43,306 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-23 15:48:43,307 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-23 15:48:43,307 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-23 15:48:43,307 INFO L133 SettingsManager]: * Use SBE=true [2018-10-23 15:48:43,307 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-23 15:48:43,308 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-23 15:48:43,308 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-23 15:48:43,308 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-23 15:48:43,308 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-23 15:48:43,308 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-23 15:48:43,309 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-23 15:48:43,309 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-23 15:48:43,309 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-23 15:48:43,309 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-23 15:48:43,309 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-23 15:48:43,310 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-23 15:48:43,310 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-23 15:48:43,310 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-23 15:48:43,310 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-23 15:48:43,311 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-23 15:48:43,311 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-23 15:48:43,311 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-23 15:48:43,311 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-23 15:48:43,311 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-23 15:48:43,312 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-23 15:48:43,362 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-23 15:48:43,383 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-23 15:48:43,386 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-23 15:48:43,388 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-23 15:48:43,388 INFO L276 PluginConnector]: CDTParser initialized [2018-10-23 15:48:43,389 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/overflow_true-unreach-call1.i [2018-10-23 15:48:43,444 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/10c991606/89e44dc6172d49c3a8adedd0c2fc30e9/FLAGad49f0495 [2018-10-23 15:48:43,870 INFO L298 CDTParser]: Found 1 translation units. [2018-10-23 15:48:43,871 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/overflow_true-unreach-call1.i [2018-10-23 15:48:43,876 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/10c991606/89e44dc6172d49c3a8adedd0c2fc30e9/FLAGad49f0495 [2018-10-23 15:48:43,891 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/10c991606/89e44dc6172d49c3a8adedd0c2fc30e9 [2018-10-23 15:48:43,904 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-23 15:48:43,905 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-23 15:48:43,906 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-23 15:48:43,906 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-23 15:48:43,912 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-23 15:48:43,913 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 03:48:43" (1/1) ... [2018-10-23 15:48:43,916 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e468d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 03:48:43, skipping insertion in model container [2018-10-23 15:48:43,916 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 03:48:43" (1/1) ... [2018-10-23 15:48:43,925 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-23 15:48:43,943 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-23 15:48:44,144 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 15:48:44,148 INFO L189 MainTranslator]: Completed pre-run [2018-10-23 15:48:44,164 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 15:48:44,178 INFO L193 MainTranslator]: Completed translation [2018-10-23 15:48:44,178 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 03:48:44 WrapperNode [2018-10-23 15:48:44,178 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-23 15:48:44,179 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-23 15:48:44,179 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-23 15:48:44,180 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-23 15:48:44,187 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 03:48:44" (1/1) ... [2018-10-23 15:48:44,192 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 03:48:44" (1/1) ... [2018-10-23 15:48:44,206 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-23 15:48:44,207 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-23 15:48:44,207 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-23 15:48:44,207 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-23 15:48:44,214 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 03:48:44" (1/1) ... [2018-10-23 15:48:44,215 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 03:48:44" (1/1) ... [2018-10-23 15:48:44,215 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 03:48:44" (1/1) ... [2018-10-23 15:48:44,215 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 03:48:44" (1/1) ... [2018-10-23 15:48:44,217 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 03:48:44" (1/1) ... [2018-10-23 15:48:44,221 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 03:48:44" (1/1) ... [2018-10-23 15:48:44,222 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 03:48:44" (1/1) ... [2018-10-23 15:48:44,223 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-23 15:48:44,224 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-23 15:48:44,224 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-23 15:48:44,224 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-23 15:48:44,225 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 03:48:44" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:48:44,345 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-23 15:48:44,345 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-23 15:48:44,515 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-23 15:48:44,516 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 03:48:44 BoogieIcfgContainer [2018-10-23 15:48:44,516 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-23 15:48:44,517 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-23 15:48:44,517 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-23 15:48:44,520 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-23 15:48:44,521 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 03:48:43" (1/3) ... [2018-10-23 15:48:44,521 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4edc8ebd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 03:48:44, skipping insertion in model container [2018-10-23 15:48:44,522 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 03:48:44" (2/3) ... [2018-10-23 15:48:44,522 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4edc8ebd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 03:48:44, skipping insertion in model container [2018-10-23 15:48:44,522 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 03:48:44" (3/3) ... [2018-10-23 15:48:44,524 INFO L112 eAbstractionObserver]: Analyzing ICFG overflow_true-unreach-call1.i [2018-10-23 15:48:44,533 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-23 15:48:44,539 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-23 15:48:44,552 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-23 15:48:44,582 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-23 15:48:44,582 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-23 15:48:44,582 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-23 15:48:44,583 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-23 15:48:44,583 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-23 15:48:44,583 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-23 15:48:44,583 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-23 15:48:44,583 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-23 15:48:44,583 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-23 15:48:44,595 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2018-10-23 15:48:44,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-23 15:48:44,600 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:48:44,601 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-23 15:48:44,603 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:48:44,609 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:48:44,610 INFO L82 PathProgramCache]: Analyzing trace with hash 889783783, now seen corresponding path program 1 times [2018-10-23 15:48:44,612 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:48:44,612 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:48:44,661 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:44,662 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 15:48:44,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:44,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:48:44,717 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:48:44,719 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 15:48:44,719 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-23 15:48:44,723 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-23 15:48:44,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-23 15:48:44,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-23 15:48:44,738 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 2 states. [2018-10-23 15:48:44,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:48:44,754 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2018-10-23 15:48:44,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-23 15:48:44,756 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-23 15:48:44,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:48:44,765 INFO L225 Difference]: With dead ends: 20 [2018-10-23 15:48:44,765 INFO L226 Difference]: Without dead ends: 8 [2018-10-23 15:48:44,769 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-23 15:48:44,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-10-23 15:48:44,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-10-23 15:48:44,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-10-23 15:48:44,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-10-23 15:48:44,801 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-10-23 15:48:44,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:48:44,801 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-10-23 15:48:44,801 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-23 15:48:44,802 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-10-23 15:48:44,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-23 15:48:44,802 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:48:44,803 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-23 15:48:44,803 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:48:44,803 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:48:44,804 INFO L82 PathProgramCache]: Analyzing trace with hash 1805923659, now seen corresponding path program 1 times [2018-10-23 15:48:44,804 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:48:44,804 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:48:44,805 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:44,806 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 15:48:44,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:44,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:48:44,993 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:48:44,994 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 15:48:44,995 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-23 15:48:44,999 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-23 15:48:44,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-23 15:48:45,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 15:48:45,000 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 3 states. [2018-10-23 15:48:45,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:48:45,133 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-10-23 15:48:45,146 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-23 15:48:45,146 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2018-10-23 15:48:45,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:48:45,147 INFO L225 Difference]: With dead ends: 14 [2018-10-23 15:48:45,147 INFO L226 Difference]: Without dead ends: 10 [2018-10-23 15:48:45,148 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 15:48:45,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-10-23 15:48:45,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-10-23 15:48:45,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-10-23 15:48:45,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-10-23 15:48:45,152 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 7 [2018-10-23 15:48:45,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:48:45,153 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-10-23 15:48:45,153 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-23 15:48:45,153 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-10-23 15:48:45,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-10-23 15:48:45,154 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:48:45,154 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 15:48:45,154 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:48:45,155 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:48:45,155 INFO L82 PathProgramCache]: Analyzing trace with hash 373599493, now seen corresponding path program 1 times [2018-10-23 15:48:45,155 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:48:45,156 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:48:45,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:45,157 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 15:48:45,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:45,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:48:45,310 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:48:45,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:48:45,311 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:48:45,327 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 15:48:45,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:48:45,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:48:45,383 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:48:45,407 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:48:45,407 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-23 15:48:45,407 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-23 15:48:45,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-23 15:48:45,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-23 15:48:45,408 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 4 states. [2018-10-23 15:48:45,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:48:45,442 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-23 15:48:45,442 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-23 15:48:45,442 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2018-10-23 15:48:45,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:48:45,444 INFO L225 Difference]: With dead ends: 16 [2018-10-23 15:48:45,444 INFO L226 Difference]: Without dead ends: 12 [2018-10-23 15:48:45,445 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-23 15:48:45,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-23 15:48:45,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-23 15:48:45,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-23 15:48:45,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-23 15:48:45,449 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2018-10-23 15:48:45,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:48:45,450 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-23 15:48:45,450 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-23 15:48:45,450 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-23 15:48:45,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-23 15:48:45,451 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:48:45,451 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1] [2018-10-23 15:48:45,451 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:48:45,452 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:48:45,452 INFO L82 PathProgramCache]: Analyzing trace with hash -1700389313, now seen corresponding path program 2 times [2018-10-23 15:48:45,452 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:48:45,452 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:48:45,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:45,453 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 15:48:45,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:45,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:48:45,614 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:48:45,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:48:45,615 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:48:45,624 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 15:48:45,642 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 15:48:45,642 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:48:45,644 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:48:45,673 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:48:45,704 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:48:45,704 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-23 15:48:45,705 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-23 15:48:45,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-23 15:48:45,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-23 15:48:45,705 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2018-10-23 15:48:45,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:48:45,865 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-10-23 15:48:45,866 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-23 15:48:45,866 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-10-23 15:48:45,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:48:45,867 INFO L225 Difference]: With dead ends: 18 [2018-10-23 15:48:45,867 INFO L226 Difference]: Without dead ends: 14 [2018-10-23 15:48:45,868 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-23 15:48:45,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-23 15:48:45,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-23 15:48:45,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-23 15:48:45,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-23 15:48:45,872 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-23 15:48:45,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:48:45,873 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-23 15:48:45,873 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-23 15:48:45,874 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-23 15:48:45,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-23 15:48:45,874 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:48:45,874 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1] [2018-10-23 15:48:45,875 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:48:45,875 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:48:45,875 INFO L82 PathProgramCache]: Analyzing trace with hash -1938806535, now seen corresponding path program 3 times [2018-10-23 15:48:45,875 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:48:45,877 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:48:45,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:45,878 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:48:45,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:45,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:48:46,179 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:48:46,179 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:48:46,179 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:48:46,197 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 15:48:46,223 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-23 15:48:46,223 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:48:46,225 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:48:46,272 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:48:46,293 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:48:46,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-23 15:48:46,293 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-23 15:48:46,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-23 15:48:46,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-23 15:48:46,294 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-10-23 15:48:46,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:48:46,350 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-10-23 15:48:46,352 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-23 15:48:46,352 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2018-10-23 15:48:46,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:48:46,353 INFO L225 Difference]: With dead ends: 20 [2018-10-23 15:48:46,353 INFO L226 Difference]: Without dead ends: 16 [2018-10-23 15:48:46,353 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-23 15:48:46,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-23 15:48:46,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-23 15:48:46,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-23 15:48:46,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-23 15:48:46,357 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-23 15:48:46,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:48:46,357 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-23 15:48:46,358 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-23 15:48:46,358 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-23 15:48:46,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-23 15:48:46,359 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:48:46,359 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1] [2018-10-23 15:48:46,359 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:48:46,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:48:46,360 INFO L82 PathProgramCache]: Analyzing trace with hash 870477107, now seen corresponding path program 4 times [2018-10-23 15:48:46,360 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:48:46,360 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:48:46,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:46,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:48:46,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:46,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:48:46,523 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:48:46,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:48:46,523 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:48:46,532 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 15:48:46,566 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 15:48:46,566 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:48:46,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:48:46,638 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:48:46,658 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:48:46,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-23 15:48:46,659 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-23 15:48:46,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-23 15:48:46,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-23 15:48:46,659 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-10-23 15:48:46,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:48:46,717 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-23 15:48:46,722 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-23 15:48:46,723 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-10-23 15:48:46,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:48:46,723 INFO L225 Difference]: With dead ends: 22 [2018-10-23 15:48:46,724 INFO L226 Difference]: Without dead ends: 18 [2018-10-23 15:48:46,724 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-23 15:48:46,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-23 15:48:46,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-23 15:48:46,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-23 15:48:46,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-23 15:48:46,728 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-23 15:48:46,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:48:46,729 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-23 15:48:46,729 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-23 15:48:46,729 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-23 15:48:46,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-23 15:48:46,729 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:48:46,730 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1] [2018-10-23 15:48:46,730 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:48:46,730 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:48:46,730 INFO L82 PathProgramCache]: Analyzing trace with hash -942372115, now seen corresponding path program 5 times [2018-10-23 15:48:46,731 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:48:46,731 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:48:46,732 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:46,732 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:48:46,732 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:46,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:48:46,997 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:48:46,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:48:46,998 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-10-23 15:48:47,014 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 15:48:47,031 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-23 15:48:47,031 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:48:47,035 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:48:47,085 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:48:47,111 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:48:47,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-23 15:48:47,111 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-23 15:48:47,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-23 15:48:47,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-23 15:48:47,112 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 8 states. [2018-10-23 15:48:47,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:48:47,460 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-23 15:48:47,461 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-23 15:48:47,461 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2018-10-23 15:48:47,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:48:47,462 INFO L225 Difference]: With dead ends: 24 [2018-10-23 15:48:47,462 INFO L226 Difference]: Without dead ends: 20 [2018-10-23 15:48:47,462 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-23 15:48:47,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-23 15:48:47,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-23 15:48:47,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-23 15:48:47,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-23 15:48:47,467 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-23 15:48:47,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:48:47,467 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-23 15:48:47,467 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-23 15:48:47,467 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-23 15:48:47,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-23 15:48:47,468 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:48:47,468 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1] [2018-10-23 15:48:47,468 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:48:47,469 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:48:47,469 INFO L82 PathProgramCache]: Analyzing trace with hash 666247719, now seen corresponding path program 6 times [2018-10-23 15:48:47,469 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:48:47,469 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:48:47,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:47,470 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:48:47,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:47,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:48:47,688 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:48:47,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:48:47,688 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:48:47,696 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-23 15:48:59,728 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-23 15:48:59,728 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:48:59,731 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:48:59,758 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:48:59,779 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:48:59,779 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-23 15:48:59,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-23 15:48:59,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-23 15:48:59,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-23 15:48:59,780 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2018-10-23 15:48:59,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:48:59,898 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-10-23 15:48:59,899 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-23 15:48:59,899 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2018-10-23 15:48:59,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:48:59,900 INFO L225 Difference]: With dead ends: 26 [2018-10-23 15:48:59,900 INFO L226 Difference]: Without dead ends: 22 [2018-10-23 15:48:59,901 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-23 15:48:59,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-23 15:48:59,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-23 15:48:59,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-23 15:48:59,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-23 15:48:59,905 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-23 15:48:59,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:48:59,905 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-23 15:48:59,905 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-23 15:48:59,906 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-23 15:48:59,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-23 15:48:59,906 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:48:59,906 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1] [2018-10-23 15:48:59,907 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:48:59,907 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:48:59,907 INFO L82 PathProgramCache]: Analyzing trace with hash 361681633, now seen corresponding path program 7 times [2018-10-23 15:48:59,907 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:48:59,908 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:48:59,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:59,908 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:48:59,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:48:59,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:49:00,189 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:49:00,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:49:00,189 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:49:00,197 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 15:49:00,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:49:00,209 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:49:00,245 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:49:00,266 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:49:00,266 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-23 15:49:00,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-23 15:49:00,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-23 15:49:00,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-23 15:49:00,267 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 10 states. [2018-10-23 15:49:00,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:49:00,393 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-10-23 15:49:00,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-23 15:49:00,394 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2018-10-23 15:49:00,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:49:00,395 INFO L225 Difference]: With dead ends: 28 [2018-10-23 15:49:00,395 INFO L226 Difference]: Without dead ends: 24 [2018-10-23 15:49:00,395 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-23 15:49:00,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-23 15:49:00,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-23 15:49:00,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-23 15:49:00,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-23 15:49:00,400 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-23 15:49:00,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:49:00,400 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-23 15:49:00,400 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-23 15:49:00,400 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-23 15:49:00,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-23 15:49:00,401 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:49:00,401 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1] [2018-10-23 15:49:00,402 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:49:00,402 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:49:00,402 INFO L82 PathProgramCache]: Analyzing trace with hash -268550885, now seen corresponding path program 8 times [2018-10-23 15:49:00,402 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:49:00,402 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:49:00,403 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:49:00,403 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 15:49:00,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:49:00,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:49:00,745 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:49:00,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:49:00,745 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:49:00,758 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 15:49:00,771 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 15:49:00,771 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:49:00,773 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:49:00,789 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:49:00,809 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:49:00,810 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-23 15:49:00,810 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-23 15:49:00,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-23 15:49:00,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-23 15:49:00,811 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 11 states. [2018-10-23 15:49:00,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:49:00,950 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-23 15:49:00,951 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-23 15:49:00,951 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2018-10-23 15:49:00,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:49:00,952 INFO L225 Difference]: With dead ends: 30 [2018-10-23 15:49:00,952 INFO L226 Difference]: Without dead ends: 26 [2018-10-23 15:49:00,953 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-23 15:49:00,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-23 15:49:00,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-23 15:49:00,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-23 15:49:00,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-23 15:49:00,958 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-23 15:49:00,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:49:00,958 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-23 15:49:00,958 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-23 15:49:00,959 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-23 15:49:00,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-23 15:49:00,959 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:49:00,959 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1] [2018-10-23 15:49:00,960 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:49:00,960 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:49:00,960 INFO L82 PathProgramCache]: Analyzing trace with hash -331611947, now seen corresponding path program 9 times [2018-10-23 15:49:00,960 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:49:00,960 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:49:00,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:49:00,961 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:49:00,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:49:00,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:49:01,507 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:49:01,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:49:01,508 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:49:01,522 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 15:49:01,575 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-23 15:49:01,575 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:49:01,577 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:49:01,591 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:49:01,612 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:49:01,613 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-23 15:49:01,613 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-23 15:49:01,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-23 15:49:01,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-23 15:49:01,614 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 12 states. [2018-10-23 15:49:01,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:49:01,800 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-10-23 15:49:01,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-23 15:49:01,800 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2018-10-23 15:49:01,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:49:01,803 INFO L225 Difference]: With dead ends: 32 [2018-10-23 15:49:01,803 INFO L226 Difference]: Without dead ends: 28 [2018-10-23 15:49:01,804 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-23 15:49:01,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-23 15:49:01,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-23 15:49:01,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-23 15:49:01,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-23 15:49:01,808 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-23 15:49:01,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:49:01,808 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-23 15:49:01,809 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-23 15:49:01,809 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-23 15:49:01,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-23 15:49:01,809 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:49:01,809 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1] [2018-10-23 15:49:01,810 INFO L424 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:49:01,810 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:49:01,810 INFO L82 PathProgramCache]: Analyzing trace with hash -803750385, now seen corresponding path program 10 times [2018-10-23 15:49:01,810 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:49:01,810 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:49:01,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:49:01,811 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:49:01,812 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:49:01,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:49:02,259 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:49:02,260 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:49:02,260 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:49:02,277 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 15:49:02,297 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 15:49:02,297 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:49:02,300 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:49:02,328 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:49:02,348 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:49:02,349 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-23 15:49:02,349 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-23 15:49:02,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-23 15:49:02,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-23 15:49:02,350 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 13 states. [2018-10-23 15:49:02,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:49:02,567 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-10-23 15:49:02,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-23 15:49:02,568 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2018-10-23 15:49:02,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:49:02,570 INFO L225 Difference]: With dead ends: 34 [2018-10-23 15:49:02,570 INFO L226 Difference]: Without dead ends: 30 [2018-10-23 15:49:02,570 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-23 15:49:02,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-23 15:49:02,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-23 15:49:02,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-23 15:49:02,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-23 15:49:02,574 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-23 15:49:02,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:49:02,575 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-23 15:49:02,575 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-23 15:49:02,575 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-23 15:49:02,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-23 15:49:02,576 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:49:02,576 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1] [2018-10-23 15:49:02,576 INFO L424 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:49:02,577 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:49:02,577 INFO L82 PathProgramCache]: Analyzing trace with hash 737744073, now seen corresponding path program 11 times [2018-10-23 15:49:02,577 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:49:02,577 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:49:02,578 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:49:02,578 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:49:02,578 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:49:02,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:49:02,937 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:49:02,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:49:02,938 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:49:02,946 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-23 15:49:54,018 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-23 15:49:54,018 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:49:57,767 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:49:57,783 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:49:57,803 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:49:57,803 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-23 15:49:57,803 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-23 15:49:57,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-23 15:49:57,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-23 15:49:57,804 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 14 states. [2018-10-23 15:49:57,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:49:57,956 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-23 15:49:57,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-23 15:49:57,957 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2018-10-23 15:49:57,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:49:57,958 INFO L225 Difference]: With dead ends: 36 [2018-10-23 15:49:57,958 INFO L226 Difference]: Without dead ends: 32 [2018-10-23 15:49:57,959 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-23 15:49:57,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-23 15:49:57,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-23 15:49:57,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-23 15:49:57,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-23 15:49:57,965 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-23 15:49:57,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:49:57,965 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-23 15:49:57,965 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-23 15:49:57,965 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-23 15:49:57,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-23 15:49:57,966 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:49:57,966 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1] [2018-10-23 15:49:57,967 INFO L424 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:49:57,967 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:49:57,967 INFO L82 PathProgramCache]: Analyzing trace with hash 350201091, now seen corresponding path program 12 times [2018-10-23 15:49:57,967 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:49:57,967 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:49:57,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:49:57,968 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:49:57,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:49:57,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:49:58,295 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:49:58,295 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:49:58,296 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:49:58,308 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-23 15:50:10,504 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-23 15:50:10,504 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:50:10,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:50:10,523 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:50:10,544 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:50:10,544 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-23 15:50:10,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-23 15:50:10,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-23 15:50:10,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-23 15:50:10,546 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 15 states. [2018-10-23 15:50:10,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:50:10,802 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-10-23 15:50:10,803 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-23 15:50:10,803 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2018-10-23 15:50:10,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:50:10,803 INFO L225 Difference]: With dead ends: 38 [2018-10-23 15:50:10,804 INFO L226 Difference]: Without dead ends: 34 [2018-10-23 15:50:10,804 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-23 15:50:10,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-23 15:50:10,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-23 15:50:10,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-23 15:50:10,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-23 15:50:10,810 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-23 15:50:10,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:50:10,811 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-23 15:50:10,811 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-23 15:50:10,811 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-23 15:50:10,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-23 15:50:10,812 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:50:10,812 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1] [2018-10-23 15:50:10,812 INFO L424 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:50:10,813 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:50:10,813 INFO L82 PathProgramCache]: Analyzing trace with hash 1583550141, now seen corresponding path program 13 times [2018-10-23 15:50:10,813 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:50:10,813 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:50:10,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:50:10,814 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:50:10,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:50:10,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:50:11,415 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:50:11,416 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:50:11,416 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:50:11,424 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 15:50:11,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:50:11,440 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:50:11,458 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:50:11,480 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:50:11,480 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-23 15:50:11,480 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-23 15:50:11,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-23 15:50:11,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-23 15:50:11,481 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 16 states. [2018-10-23 15:50:11,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:50:11,800 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-10-23 15:50:11,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-23 15:50:11,801 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2018-10-23 15:50:11,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:50:11,802 INFO L225 Difference]: With dead ends: 40 [2018-10-23 15:50:11,803 INFO L226 Difference]: Without dead ends: 36 [2018-10-23 15:50:11,804 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-23 15:50:11,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-23 15:50:11,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-23 15:50:11,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-23 15:50:11,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-23 15:50:11,809 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-23 15:50:11,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:50:11,809 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-23 15:50:11,809 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-23 15:50:11,810 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-23 15:50:11,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-23 15:50:11,810 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:50:11,811 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1] [2018-10-23 15:50:11,811 INFO L424 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:50:11,811 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:50:11,811 INFO L82 PathProgramCache]: Analyzing trace with hash 1421013495, now seen corresponding path program 14 times [2018-10-23 15:50:11,812 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:50:11,812 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:50:11,812 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:50:11,813 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 15:50:11,813 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:50:11,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:50:12,407 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:50:12,407 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:50:12,407 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:50:12,415 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 15:50:12,458 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 15:50:12,458 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:50:12,461 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:50:12,535 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:50:12,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:50:12,571 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-23 15:50:12,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-23 15:50:12,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-23 15:50:12,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-23 15:50:12,573 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 17 states. [2018-10-23 15:50:12,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:50:12,932 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-23 15:50:12,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-23 15:50:12,933 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2018-10-23 15:50:12,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:50:12,934 INFO L225 Difference]: With dead ends: 42 [2018-10-23 15:50:12,934 INFO L226 Difference]: Without dead ends: 38 [2018-10-23 15:50:12,935 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-23 15:50:12,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-23 15:50:12,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-23 15:50:12,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-23 15:50:12,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-23 15:50:12,956 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-23 15:50:12,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:50:12,957 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-23 15:50:12,957 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-23 15:50:12,957 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-23 15:50:12,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-23 15:50:12,958 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:50:12,958 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1] [2018-10-23 15:50:12,958 INFO L424 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:50:12,958 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:50:12,958 INFO L82 PathProgramCache]: Analyzing trace with hash -157880655, now seen corresponding path program 15 times [2018-10-23 15:50:12,959 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:50:12,959 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:50:12,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:50:12,960 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:50:12,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:50:12,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:50:13,343 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:50:13,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:50:13,344 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:50:13,351 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 15:50:13,409 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-23 15:50:13,409 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:50:13,411 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:50:13,451 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:50:13,480 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:50:13,480 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-23 15:50:13,480 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-23 15:50:13,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-23 15:50:13,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-23 15:50:13,481 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 18 states. [2018-10-23 15:50:13,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:50:13,942 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-10-23 15:50:13,942 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-23 15:50:13,942 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 37 [2018-10-23 15:50:13,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:50:13,943 INFO L225 Difference]: With dead ends: 44 [2018-10-23 15:50:13,943 INFO L226 Difference]: Without dead ends: 40 [2018-10-23 15:50:13,944 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-23 15:50:13,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-23 15:50:13,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-23 15:50:13,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-23 15:50:13,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-23 15:50:13,949 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-10-23 15:50:13,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:50:13,949 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-23 15:50:13,949 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-23 15:50:13,950 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-23 15:50:13,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-23 15:50:13,950 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:50:13,951 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1] [2018-10-23 15:50:13,951 INFO L424 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:50:13,951 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:50:13,951 INFO L82 PathProgramCache]: Analyzing trace with hash -1351703317, now seen corresponding path program 16 times [2018-10-23 15:50:13,951 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:50:13,952 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:50:13,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:50:13,952 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:50:13,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:50:13,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:50:14,384 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:50:14,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:50:14,384 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:50:14,392 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 15:50:14,418 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 15:50:14,418 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:50:14,424 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:50:14,509 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:50:14,540 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:50:14,540 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-23 15:50:14,541 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-23 15:50:14,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-23 15:50:14,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-23 15:50:14,542 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 19 states. [2018-10-23 15:50:14,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:50:14,817 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-10-23 15:50:14,817 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-23 15:50:14,818 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 39 [2018-10-23 15:50:14,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:50:14,818 INFO L225 Difference]: With dead ends: 46 [2018-10-23 15:50:14,818 INFO L226 Difference]: Without dead ends: 42 [2018-10-23 15:50:14,819 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-23 15:50:14,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-23 15:50:14,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-23 15:50:14,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-23 15:50:14,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-23 15:50:14,825 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-10-23 15:50:14,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:50:14,826 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-23 15:50:14,826 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-23 15:50:14,826 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-23 15:50:14,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-23 15:50:14,827 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:50:14,827 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1] [2018-10-23 15:50:14,827 INFO L424 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:50:14,827 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:50:14,828 INFO L82 PathProgramCache]: Analyzing trace with hash -1859013467, now seen corresponding path program 17 times [2018-10-23 15:50:14,828 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:50:14,828 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:50:14,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:50:14,829 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:50:14,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:50:14,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:50:15,866 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:50:15,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:50:15,866 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:50:15,874 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-23 15:51:59,456 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-23 15:51:59,456 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:51:59,546 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:51:59,574 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:51:59,579 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:51:59,579 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2018-10-23 15:51:59,579 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-23 15:51:59,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-23 15:51:59,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-23 15:51:59,581 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 20 states. [2018-10-23 15:52:00,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:52:00,342 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-23 15:52:00,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-23 15:52:00,343 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 41 [2018-10-23 15:52:00,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:52:00,343 INFO L225 Difference]: With dead ends: 48 [2018-10-23 15:52:00,343 INFO L226 Difference]: Without dead ends: 44 [2018-10-23 15:52:00,344 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-23 15:52:00,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-23 15:52:00,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-10-23 15:52:00,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-23 15:52:00,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-23 15:52:00,347 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-10-23 15:52:00,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:52:00,348 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-23 15:52:00,348 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-23 15:52:00,348 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-23 15:52:00,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-23 15:52:00,349 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:52:00,349 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1] [2018-10-23 15:52:00,349 INFO L424 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:52:00,349 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:52:00,350 INFO L82 PathProgramCache]: Analyzing trace with hash 242204127, now seen corresponding path program 18 times [2018-10-23 15:52:00,350 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:52:00,350 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:52:00,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:52:00,351 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:52:00,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:52:00,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:52:00,685 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:52:00,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:52:00,685 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:52:00,694 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-23 15:53:18,672 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-10-23 15:53:18,672 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:53:18,703 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:53:18,732 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:53:18,758 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:53:18,758 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-10-23 15:53:18,758 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-23 15:53:18,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-23 15:53:18,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-10-23 15:53:18,759 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 21 states. [2018-10-23 15:53:19,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:53:19,210 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-10-23 15:53:19,211 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-23 15:53:19,211 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2018-10-23 15:53:19,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:53:19,212 INFO L225 Difference]: With dead ends: 50 [2018-10-23 15:53:19,212 INFO L226 Difference]: Without dead ends: 46 [2018-10-23 15:53:19,213 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-10-23 15:53:19,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-23 15:53:19,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-10-23 15:53:19,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-23 15:53:19,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-10-23 15:53:19,219 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-10-23 15:53:19,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:53:19,219 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-10-23 15:53:19,219 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-23 15:53:19,220 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-10-23 15:53:19,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-23 15:53:19,220 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:53:19,221 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1] [2018-10-23 15:53:19,221 INFO L424 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:53:19,221 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:53:19,221 INFO L82 PathProgramCache]: Analyzing trace with hash 877682841, now seen corresponding path program 19 times [2018-10-23 15:53:19,221 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:53:19,222 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:53:19,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:53:19,223 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:53:19,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:53:19,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:53:19,583 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:53:19,583 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:53:19,583 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:53:19,592 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 15:53:19,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:53:19,609 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:53:19,637 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:53:19,658 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:53:19,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-10-23 15:53:19,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-23 15:53:19,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-23 15:53:19,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-10-23 15:53:19,659 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 22 states. [2018-10-23 15:53:19,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:53:19,981 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-10-23 15:53:19,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-23 15:53:19,981 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 45 [2018-10-23 15:53:19,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:53:19,982 INFO L225 Difference]: With dead ends: 52 [2018-10-23 15:53:19,982 INFO L226 Difference]: Without dead ends: 48 [2018-10-23 15:53:19,983 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-10-23 15:53:19,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-23 15:53:19,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-23 15:53:19,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-23 15:53:19,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-23 15:53:19,988 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 45 [2018-10-23 15:53:19,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:53:19,989 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-23 15:53:19,989 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-23 15:53:19,989 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-23 15:53:19,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-23 15:53:19,989 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:53:19,990 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1] [2018-10-23 15:53:19,992 INFO L424 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:53:19,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:53:19,992 INFO L82 PathProgramCache]: Analyzing trace with hash 1687370963, now seen corresponding path program 20 times [2018-10-23 15:53:19,992 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:53:19,992 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:53:19,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:53:19,993 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 15:53:19,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:53:20,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:53:20,397 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:53:20,398 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:53:20,398 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:53:20,407 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 15:53:20,423 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 15:53:20,423 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:53:20,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:53:20,442 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:53:20,465 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:53:20,465 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-10-23 15:53:20,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-23 15:53:20,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-23 15:53:20,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-10-23 15:53:20,466 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 23 states. [2018-10-23 15:53:20,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:53:20,826 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-23 15:53:20,829 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-23 15:53:20,829 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 47 [2018-10-23 15:53:20,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:53:20,830 INFO L225 Difference]: With dead ends: 54 [2018-10-23 15:53:20,830 INFO L226 Difference]: Without dead ends: 50 [2018-10-23 15:53:20,831 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-10-23 15:53:20,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-23 15:53:20,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-10-23 15:53:20,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-23 15:53:20,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-23 15:53:20,834 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 47 [2018-10-23 15:53:20,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:53:20,835 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-23 15:53:20,835 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-23 15:53:20,835 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-23 15:53:20,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-23 15:53:20,836 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:53:20,836 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1] [2018-10-23 15:53:20,836 INFO L424 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:53:20,836 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:53:20,836 INFO L82 PathProgramCache]: Analyzing trace with hash -1886391667, now seen corresponding path program 21 times [2018-10-23 15:53:20,836 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:53:20,837 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:53:20,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:53:20,837 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:53:20,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:53:20,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:53:22,486 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:53:22,486 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:53:22,486 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:53:22,495 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 15:53:22,547 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-23 15:53:22,547 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:53:22,549 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:53:22,569 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:53:22,590 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:53:22,591 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 24 [2018-10-23 15:53:22,591 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-23 15:53:22,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-23 15:53:22,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-10-23 15:53:22,592 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 24 states. [2018-10-23 15:53:22,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:53:23,000 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-10-23 15:53:23,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-23 15:53:23,000 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 49 [2018-10-23 15:53:23,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:53:23,001 INFO L225 Difference]: With dead ends: 56 [2018-10-23 15:53:23,002 INFO L226 Difference]: Without dead ends: 52 [2018-10-23 15:53:23,002 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-10-23 15:53:23,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-23 15:53:23,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-23 15:53:23,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-23 15:53:23,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-23 15:53:23,009 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 49 [2018-10-23 15:53:23,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:53:23,009 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-23 15:53:23,010 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-23 15:53:23,010 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-23 15:53:23,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-23 15:53:23,011 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:53:23,011 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1] [2018-10-23 15:53:23,011 INFO L424 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:53:23,011 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:53:23,011 INFO L82 PathProgramCache]: Analyzing trace with hash -298442297, now seen corresponding path program 22 times [2018-10-23 15:53:23,012 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:53:23,012 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:53:23,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:53:23,015 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:53:23,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:53:23,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:53:23,462 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:53:23,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:53:23,462 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:53:23,470 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 15:53:23,488 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 15:53:23,488 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 15:53:23,490 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 15:53:23,529 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:53:23,549 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 15:53:23,549 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-10-23 15:53:23,550 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-23 15:53:23,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-23 15:53:23,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-10-23 15:53:23,550 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 25 states. [2018-10-23 15:53:23,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 15:53:23,953 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-10-23 15:53:23,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-23 15:53:23,954 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 51 [2018-10-23 15:53:23,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 15:53:23,955 INFO L225 Difference]: With dead ends: 58 [2018-10-23 15:53:23,955 INFO L226 Difference]: Without dead ends: 54 [2018-10-23 15:53:23,956 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-10-23 15:53:23,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-23 15:53:23,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-23 15:53:23,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-23 15:53:23,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-23 15:53:23,961 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 51 [2018-10-23 15:53:23,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 15:53:23,961 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-23 15:53:23,961 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-23 15:53:23,961 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-23 15:53:23,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-23 15:53:23,962 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 15:53:23,962 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1] [2018-10-23 15:53:23,962 INFO L424 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 15:53:23,962 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 15:53:23,962 INFO L82 PathProgramCache]: Analyzing trace with hash 1007512193, now seen corresponding path program 23 times [2018-10-23 15:53:23,962 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 15:53:23,962 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 15:53:23,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:53:23,963 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 15:53:23,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 15:53:23,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 15:53:25,343 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 15:53:25,343 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 15:53:25,343 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-23 15:53:25,351 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown