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/functions_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 15:44:51,313 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 15:44:51,315 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 15:44:51,335 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 15:44:51,336 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 15:44:51,337 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 15:44:51,339 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 15:44:51,342 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 15:44:51,343 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 15:44:51,345 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 15:44:51,347 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 15:44:51,347 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 15:44:51,348 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 15:44:51,349 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 15:44:51,351 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 15:44:51,354 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 15:44:51,355 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 15:44:51,357 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 15:44:51,358 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 15:44:51,360 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 15:44:51,361 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 15:44:51,362 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 15:44:51,365 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 15:44:51,365 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 15:44:51,365 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 15:44:51,366 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 15:44:51,367 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 15:44:51,368 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 15:44:51,369 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 15:44:51,370 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 15:44:51,370 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 15:44:51,371 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-22 15:44:51,371 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-22 15:44:51,371 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-22 15:44:51,372 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-22 15:44:51,373 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-22 15:44:51,373 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 [2018-10-22 15:44:51,388 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 15:44:51,388 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 15:44:51,389 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 15:44:51,389 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-22 15:44:51,390 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-22 15:44:51,390 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-22 15:44:51,390 INFO L133 SettingsManager]: * Use SBE=true [2018-10-22 15:44:51,391 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 15:44:51,391 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 15:44:51,391 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 15:44:51,391 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 15:44:51,391 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 15:44:51,392 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 15:44:51,392 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 15:44:51,392 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 15:44:51,392 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 15:44:51,392 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 15:44:51,393 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 15:44:51,393 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 15:44:51,393 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 15:44:51,393 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 15:44:51,394 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 15:44:51,394 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 15:44:51,394 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-22 15:44:51,394 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 15:44:51,394 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 15:44:51,395 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 15:44:51,395 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 15:44:51,438 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 15:44:51,451 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 15:44:51,454 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 15:44:51,456 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 15:44:51,457 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 15:44:51,457 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i [2018-10-22 15:44:51,519 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/a57b8d38a/2051f42f3d5240b89d6cf9ccd3ed921c/FLAGdb51e8b7b [2018-10-22 15:44:51,991 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 15:44:51,991 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i [2018-10-22 15:44:52,001 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/a57b8d38a/2051f42f3d5240b89d6cf9ccd3ed921c/FLAGdb51e8b7b [2018-10-22 15:44:52,019 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/a57b8d38a/2051f42f3d5240b89d6cf9ccd3ed921c [2018-10-22 15:44:52,034 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 15:44:52,036 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 15:44:52,037 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 15:44:52,037 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 15:44:52,042 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 15:44:52,043 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:44:52" (1/1) ... [2018-10-22 15:44:52,046 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@373ca2bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:44:52, skipping insertion in model container [2018-10-22 15:44:52,047 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:44:52" (1/1) ... [2018-10-22 15:44:52,057 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 15:44:52,081 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 15:44:52,291 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:44:52,295 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 15:44:52,313 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:44:52,331 INFO L193 MainTranslator]: Completed translation [2018-10-22 15:44:52,332 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:44:52 WrapperNode [2018-10-22 15:44:52,332 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 15:44:52,333 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 15:44:52,333 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 15:44:52,334 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 15:44:52,345 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:44:52" (1/1) ... [2018-10-22 15:44:52,352 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:44:52" (1/1) ... [2018-10-22 15:44:52,374 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 15:44:52,375 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 15:44:52,375 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 15:44:52,375 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 15:44:52,386 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:44:52" (1/1) ... [2018-10-22 15:44:52,387 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:44:52" (1/1) ... [2018-10-22 15:44:52,388 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:44:52" (1/1) ... [2018-10-22 15:44:52,388 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:44:52" (1/1) ... [2018-10-22 15:44:52,394 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:44:52" (1/1) ... [2018-10-22 15:44:52,399 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:44:52" (1/1) ... [2018-10-22 15:44:52,400 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:44:52" (1/1) ... [2018-10-22 15:44:52,403 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 15:44:52,404 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 15:44:52,404 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 15:44:52,404 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 15:44:52,405 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:44:52" (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 [2018-10-22 15:44:52,537 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 15:44:52,538 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 15:44:52,753 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 15:44:52,754 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:44:52 BoogieIcfgContainer [2018-10-22 15:44:52,754 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 15:44:52,755 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 15:44:52,755 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 15:44:52,758 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 15:44:52,758 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 03:44:52" (1/3) ... [2018-10-22 15:44:52,759 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4402f06c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:44:52, skipping insertion in model container [2018-10-22 15:44:52,759 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:44:52" (2/3) ... [2018-10-22 15:44:52,760 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4402f06c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:44:52, skipping insertion in model container [2018-10-22 15:44:52,760 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:44:52" (3/3) ... [2018-10-22 15:44:52,762 INFO L112 eAbstractionObserver]: Analyzing ICFG functions_true-unreach-call1_true-termination.i [2018-10-22 15:44:52,771 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 15:44:52,779 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 15:44:52,796 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 15:44:52,828 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 15:44:52,829 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 15:44:52,829 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 15:44:52,830 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 15:44:52,830 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 15:44:52,830 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 15:44:52,830 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 15:44:52,830 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 15:44:52,830 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 15:44:52,845 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states. [2018-10-22 15:44:52,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-22 15:44:52,852 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:44:52,853 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-22 15:44:52,855 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:44:52,861 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:44:52,861 INFO L82 PathProgramCache]: Analyzing trace with hash 889845351, now seen corresponding path program 1 times [2018-10-22 15:44:52,864 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:44:52,864 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:44:52,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:52,917 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:44:52,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:52,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:44:52,976 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:52,978 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:44:52,979 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 15:44:52,983 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 15:44:52,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 15:44:52,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 15:44:53,002 INFO L87 Difference]: Start difference. First operand 13 states. Second operand 2 states. [2018-10-22 15:44:53,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:44:53,018 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2018-10-22 15:44:53,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 15:44:53,020 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-22 15:44:53,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:44:53,030 INFO L225 Difference]: With dead ends: 21 [2018-10-22 15:44:53,030 INFO L226 Difference]: Without dead ends: 9 [2018-10-22 15:44:53,033 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 [2018-10-22 15:44:53,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-10-22 15:44:53,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-10-22 15:44:53,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-22 15:44:53,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-10-22 15:44:53,069 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-10-22 15:44:53,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:44:53,070 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-10-22 15:44:53,070 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 15:44:53,070 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-10-22 15:44:53,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-22 15:44:53,071 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:44:53,071 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:44:53,071 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:44:53,072 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:44:53,072 INFO L82 PathProgramCache]: Analyzing trace with hash 1805925645, now seen corresponding path program 1 times [2018-10-22 15:44:53,072 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:44:53,072 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:44:53,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:53,073 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:44:53,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:53,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:44:53,218 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:53,219 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:44:53,219 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 15:44:53,220 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 15:44:53,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 15:44:53,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 15:44:53,222 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 3 states. [2018-10-22 15:44:53,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:44:53,293 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-22 15:44:53,294 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 15:44:53,294 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2018-10-22 15:44:53,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:44:53,295 INFO L225 Difference]: With dead ends: 16 [2018-10-22 15:44:53,295 INFO L226 Difference]: Without dead ends: 12 [2018-10-22 15:44:53,296 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 15:44:53,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-22 15:44:53,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2018-10-22 15:44:53,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-10-22 15:44:53,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-10-22 15:44:53,300 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 7 [2018-10-22 15:44:53,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:44:53,300 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-10-22 15:44:53,300 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 15:44:53,301 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-10-22 15:44:53,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 15:44:53,301 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:44:53,301 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:44:53,302 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:44:53,302 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:44:53,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1078158165, now seen corresponding path program 1 times [2018-10-22 15:44:53,302 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:44:53,302 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:44:53,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:53,303 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:44:53,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:53,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:44:53,494 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:53,495 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:44:53,495 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 [2018-10-22 15:44:53,506 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:44:53,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:44:53,534 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:44:53,573 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:53,604 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:44:53,604 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-22 15:44:53,605 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 15:44:53,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 15:44:53,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-22 15:44:53,606 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 5 states. [2018-10-22 15:44:53,768 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-22 15:44:53,974 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-10-22 15:44:54,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:44:54,032 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-22 15:44:54,032 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 15:44:54,032 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2018-10-22 15:44:54,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:44:54,033 INFO L225 Difference]: With dead ends: 19 [2018-10-22 15:44:54,033 INFO L226 Difference]: Without dead ends: 15 [2018-10-22 15:44:54,034 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-10-22 15:44:54,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-22 15:44:54,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2018-10-22 15:44:54,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-22 15:44:54,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-22 15:44:54,038 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 10 [2018-10-22 15:44:54,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:44:54,039 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-22 15:44:54,039 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 15:44:54,039 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-22 15:44:54,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 15:44:54,040 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:44:54,040 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2018-10-22 15:44:54,040 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:44:54,041 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:44:54,041 INFO L82 PathProgramCache]: Analyzing trace with hash 1814605, now seen corresponding path program 2 times [2018-10-22 15:44:54,041 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:44:54,041 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:44:54,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:54,043 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:44:54,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:54,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:44:54,503 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:54,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:44:54,503 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 [2018-10-22 15:44:54,515 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:44:54,536 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:44:54,536 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:44:54,538 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:44:54,552 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:54,573 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:44:54,573 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-22 15:44:54,574 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 15:44:54,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 15:44:54,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-22 15:44:54,575 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 7 states. [2018-10-22 15:44:54,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:44:54,815 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-22 15:44:54,816 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 15:44:54,816 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-10-22 15:44:54,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:44:54,816 INFO L225 Difference]: With dead ends: 22 [2018-10-22 15:44:54,817 INFO L226 Difference]: Without dead ends: 18 [2018-10-22 15:44:54,817 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2018-10-22 15:44:54,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-22 15:44:54,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-10-22 15:44:54,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-22 15:44:54,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-22 15:44:54,822 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2018-10-22 15:44:54,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:44:54,822 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-22 15:44:54,822 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 15:44:54,823 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-22 15:44:54,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-22 15:44:54,823 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:44:54,823 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2018-10-22 15:44:54,824 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:44:54,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:44:54,824 INFO L82 PathProgramCache]: Analyzing trace with hash -129408661, now seen corresponding path program 3 times [2018-10-22 15:44:54,824 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:44:54,824 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:44:54,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:54,825 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:44:54,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:54,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:44:55,059 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:55,060 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:44:55,060 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 [2018-10-22 15:44:55,068 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:44:55,090 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 15:44:55,091 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:44:55,093 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:44:55,127 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:55,156 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:44:55,156 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-22 15:44:55,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 15:44:55,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 15:44:55,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-22 15:44:55,157 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-10-22 15:44:55,476 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-10-22 15:44:55,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:44:55,716 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-22 15:44:55,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 15:44:55,717 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-10-22 15:44:55,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:44:55,719 INFO L225 Difference]: With dead ends: 25 [2018-10-22 15:44:55,719 INFO L226 Difference]: Without dead ends: 21 [2018-10-22 15:44:55,720 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2018-10-22 15:44:55,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-22 15:44:55,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2018-10-22 15:44:55,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-22 15:44:55,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-22 15:44:55,725 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2018-10-22 15:44:55,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:44:55,725 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-22 15:44:55,725 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 15:44:55,726 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-22 15:44:55,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-22 15:44:55,726 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:44:55,726 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2018-10-22 15:44:55,727 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:44:55,727 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:44:55,727 INFO L82 PathProgramCache]: Analyzing trace with hash -981486707, now seen corresponding path program 4 times [2018-10-22 15:44:55,727 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:44:55,727 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:44:55,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:55,728 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:44:55,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:55,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:44:55,966 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:55,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:44:55,967 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 [2018-10-22 15:44:55,983 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:44:56,024 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:44:56,024 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:44:56,028 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:44:56,100 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:56,124 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:44:56,124 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-22 15:44:56,125 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 15:44:56,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 15:44:56,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-22 15:44:56,126 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 11 states. [2018-10-22 15:44:56,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:44:56,468 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-10-22 15:44:56,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 15:44:56,468 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 19 [2018-10-22 15:44:56,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:44:56,470 INFO L225 Difference]: With dead ends: 28 [2018-10-22 15:44:56,470 INFO L226 Difference]: Without dead ends: 24 [2018-10-22 15:44:56,471 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2018-10-22 15:44:56,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-22 15:44:56,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2018-10-22 15:44:56,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-22 15:44:56,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-22 15:44:56,476 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2018-10-22 15:44:56,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:44:56,476 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-22 15:44:56,476 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 15:44:56,477 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-22 15:44:56,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-22 15:44:56,477 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:44:56,478 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1] [2018-10-22 15:44:56,478 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:44:56,478 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:44:56,478 INFO L82 PathProgramCache]: Analyzing trace with hash -1981835733, now seen corresponding path program 5 times [2018-10-22 15:44:56,478 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:44:56,479 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:44:56,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:56,480 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:44:56,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:56,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:44:56,691 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:56,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:44:56,691 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) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:44:56,699 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:44:56,729 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 15:44:56,729 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:44:56,732 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:44:56,760 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:56,785 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:44:56,786 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-22 15:44:56,786 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 15:44:56,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 15:44:56,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-22 15:44:56,787 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 13 states. [2018-10-22 15:44:57,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:44:57,126 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-22 15:44:57,128 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 15:44:57,128 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 22 [2018-10-22 15:44:57,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:44:57,129 INFO L225 Difference]: With dead ends: 31 [2018-10-22 15:44:57,129 INFO L226 Difference]: Without dead ends: 27 [2018-10-22 15:44:57,130 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2018-10-22 15:44:57,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-22 15:44:57,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-22 15:44:57,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-22 15:44:57,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-22 15:44:57,135 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2018-10-22 15:44:57,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:44:57,136 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-22 15:44:57,136 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 15:44:57,136 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-22 15:44:57,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-22 15:44:57,137 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:44:57,137 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1] [2018-10-22 15:44:57,137 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:44:57,138 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:44:57,138 INFO L82 PathProgramCache]: Analyzing trace with hash -601602355, now seen corresponding path program 6 times [2018-10-22 15:44:57,138 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:44:57,138 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:44:57,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:57,139 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:44:57,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:57,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:44:57,560 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:57,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:44:57,560 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 [2018-10-22 15:44:57,571 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:44:57,618 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 15:44:57,618 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:44:57,621 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:44:57,642 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:57,662 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:44:57,662 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-22 15:44:57,663 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 15:44:57,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 15:44:57,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-22 15:44:57,663 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 15 states. [2018-10-22 15:44:58,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:44:58,041 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-10-22 15:44:58,048 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 15:44:58,048 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2018-10-22 15:44:58,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:44:58,049 INFO L225 Difference]: With dead ends: 34 [2018-10-22 15:44:58,049 INFO L226 Difference]: Without dead ends: 30 [2018-10-22 15:44:58,050 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2018-10-22 15:44:58,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-22 15:44:58,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-22 15:44:58,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-22 15:44:58,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-22 15:44:58,058 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2018-10-22 15:44:58,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:44:58,059 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-22 15:44:58,059 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 15:44:58,059 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-22 15:44:58,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-22 15:44:58,060 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:44:58,060 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1] [2018-10-22 15:44:58,060 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:44:58,060 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:44:58,060 INFO L82 PathProgramCache]: Analyzing trace with hash -2085930261, now seen corresponding path program 7 times [2018-10-22 15:44:58,061 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:44:58,062 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:44:58,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:58,063 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:44:58,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:58,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:44:58,530 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:58,531 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:44:58,531 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 [2018-10-22 15:44:58,539 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:44:58,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:44:58,558 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:44:58,599 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:58,630 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:44:58,631 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-22 15:44:58,631 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 15:44:58,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 15:44:58,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-22 15:44:58,632 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 17 states. [2018-10-22 15:44:59,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:44:59,194 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-22 15:44:59,195 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 15:44:59,196 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 28 [2018-10-22 15:44:59,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:44:59,196 INFO L225 Difference]: With dead ends: 37 [2018-10-22 15:44:59,197 INFO L226 Difference]: Without dead ends: 33 [2018-10-22 15:44:59,197 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2018-10-22 15:44:59,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-22 15:44:59,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-22 15:44:59,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-22 15:44:59,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-22 15:44:59,203 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2018-10-22 15:44:59,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:44:59,203 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-22 15:44:59,203 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 15:44:59,204 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-22 15:44:59,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-22 15:44:59,204 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:44:59,205 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1] [2018-10-22 15:44:59,205 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:44:59,205 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:44:59,205 INFO L82 PathProgramCache]: Analyzing trace with hash -715298291, now seen corresponding path program 8 times [2018-10-22 15:44:59,206 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:44:59,206 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:44:59,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:59,207 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:44:59,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:44:59,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:44:59,594 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:59,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:44:59,595 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 [2018-10-22 15:44:59,614 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:44:59,650 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:44:59,650 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:44:59,653 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:44:59,707 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:44:59,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:44:59,728 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-22 15:44:59,728 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 15:44:59,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 15:44:59,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-22 15:44:59,730 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 19 states. [2018-10-22 15:45:00,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:00,432 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-10-22 15:45:00,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 15:45:00,433 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 31 [2018-10-22 15:45:00,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:00,434 INFO L225 Difference]: With dead ends: 40 [2018-10-22 15:45:00,434 INFO L226 Difference]: Without dead ends: 36 [2018-10-22 15:45:00,436 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 15:45:00,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-22 15:45:00,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-10-22 15:45:00,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-22 15:45:00,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-22 15:45:00,442 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2018-10-22 15:45:00,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:00,442 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-22 15:45:00,442 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 15:45:00,443 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-22 15:45:00,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-22 15:45:00,444 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:00,444 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:00,444 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:00,444 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:00,444 INFO L82 PathProgramCache]: Analyzing trace with hash -472363093, now seen corresponding path program 9 times [2018-10-22 15:45:00,445 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:00,445 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:00,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:00,446 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:00,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:00,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:00,881 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:00,881 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:00,881 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 [2018-10-22 15:45:00,889 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:45:04,912 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 15:45:04,912 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:45:04,920 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:04,960 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:04,990 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:04,991 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-10-22 15:45:04,991 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 15:45:04,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 15:45:04,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-10-22 15:45:04,992 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 21 states. [2018-10-22 15:45:05,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:05,883 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-22 15:45:05,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 15:45:05,883 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 34 [2018-10-22 15:45:05,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:05,885 INFO L225 Difference]: With dead ends: 43 [2018-10-22 15:45:05,885 INFO L226 Difference]: Without dead ends: 39 [2018-10-22 15:45:05,887 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2018-10-22 15:45:05,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-22 15:45:05,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-22 15:45:05,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-22 15:45:05,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-22 15:45:05,892 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2018-10-22 15:45:05,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:05,892 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-22 15:45:05,893 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 15:45:05,893 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-22 15:45:05,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-22 15:45:05,894 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:05,894 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:05,894 INFO L424 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:05,894 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:05,894 INFO L82 PathProgramCache]: Analyzing trace with hash -209773235, now seen corresponding path program 10 times [2018-10-22 15:45:05,895 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:05,895 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:05,895 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:05,896 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:05,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:05,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:06,368 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:06,369 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:06,369 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 [2018-10-22 15:45:06,379 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:45:06,425 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:45:06,425 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:45:06,431 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:06,510 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:06,545 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:06,545 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-10-22 15:45:06,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-22 15:45:06,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-22 15:45:06,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-10-22 15:45:06,547 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 23 states. [2018-10-22 15:45:07,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:07,597 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-10-22 15:45:07,598 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-22 15:45:07,598 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 37 [2018-10-22 15:45:07,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:07,599 INFO L225 Difference]: With dead ends: 46 [2018-10-22 15:45:07,599 INFO L226 Difference]: Without dead ends: 42 [2018-10-22 15:45:07,599 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2018-10-22 15:45:07,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-22 15:45:07,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-22 15:45:07,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-22 15:45:07,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-22 15:45:07,608 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2018-10-22 15:45:07,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:07,608 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-22 15:45:07,608 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-22 15:45:07,608 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-22 15:45:07,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-22 15:45:07,609 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:07,610 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:07,610 INFO L424 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:07,610 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:07,610 INFO L82 PathProgramCache]: Analyzing trace with hash 1469240427, now seen corresponding path program 11 times [2018-10-22 15:45:07,611 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:07,611 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:07,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:07,612 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:07,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:07,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:08,200 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:08,200 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:08,200 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 [2018-10-22 15:45:08,216 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:46:08,725 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 15:46:08,725 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:46:09,255 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:46:09,296 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:09,322 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:46:09,322 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-10-22 15:46:09,322 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-22 15:46:09,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-22 15:46:09,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-10-22 15:46:09,323 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 25 states. [2018-10-22 15:46:10,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:46:10,243 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-10-22 15:46:10,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-22 15:46:10,244 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 40 [2018-10-22 15:46:10,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:46:10,246 INFO L225 Difference]: With dead ends: 49 [2018-10-22 15:46:10,246 INFO L226 Difference]: Without dead ends: 45 [2018-10-22 15:46:10,247 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2018-10-22 15:46:10,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-22 15:46:10,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-22 15:46:10,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-22 15:46:10,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-22 15:46:10,252 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2018-10-22 15:46:10,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:46:10,253 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-22 15:46:10,253 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-22 15:46:10,253 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-22 15:46:10,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-22 15:46:10,254 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:46:10,254 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1] [2018-10-22 15:46:10,255 INFO L424 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:46:10,255 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:46:10,255 INFO L82 PathProgramCache]: Analyzing trace with hash 1776115853, now seen corresponding path program 12 times [2018-10-22 15:46:10,255 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:46:10,255 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:46:10,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:10,256 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:46:10,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:10,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:46:11,066 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:11,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:46:11,067 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 [2018-10-22 15:46:11,077 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:47:02,737 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 15:47:02,738 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:47:04,116 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:47:04,184 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:47:04,203 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:47:04,204 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 27 [2018-10-22 15:47:04,204 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 15:47:04,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 15:47:04,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-10-22 15:47:04,205 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 27 states. [2018-10-22 15:47:05,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:47:05,701 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-10-22 15:47:05,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 15:47:05,703 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 43 [2018-10-22 15:47:05,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:47:05,704 INFO L225 Difference]: With dead ends: 52 [2018-10-22 15:47:05,705 INFO L226 Difference]: Without dead ends: 48 [2018-10-22 15:47:05,706 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2018-10-22 15:47:05,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-22 15:47:05,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-10-22 15:47:05,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-22 15:47:05,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-10-22 15:47:05,712 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2018-10-22 15:47:05,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:47:05,712 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-10-22 15:47:05,712 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 15:47:05,712 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-10-22 15:47:05,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-22 15:47:05,713 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:47:05,713 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1] [2018-10-22 15:47:05,713 INFO L424 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:47:05,714 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:47:05,714 INFO L82 PathProgramCache]: Analyzing trace with hash -83441365, now seen corresponding path program 13 times [2018-10-22 15:47:05,714 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:47:05,714 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:47:05,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:47:05,715 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:47:05,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:47:05,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:47:06,620 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:47:06,621 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:47:06,621 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 [2018-10-22 15:47:06,629 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:47:06,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:47:06,655 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:47:06,683 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:47:06,703 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:47:06,704 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 29 [2018-10-22 15:47:06,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-22 15:47:06,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-22 15:47:06,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-10-22 15:47:06,705 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 29 states. [2018-10-22 15:47:07,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:47:07,990 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-10-22 15:47:07,990 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-22 15:47:07,990 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 46 [2018-10-22 15:47:07,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:47:07,991 INFO L225 Difference]: With dead ends: 55 [2018-10-22 15:47:07,992 INFO L226 Difference]: Without dead ends: 51 [2018-10-22 15:47:07,994 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=159, Invalid=2811, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 15:47:07,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-22 15:47:07,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-10-22 15:47:07,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-22 15:47:07,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-22 15:47:07,999 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 46 [2018-10-22 15:47:07,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:47:07,999 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-22 15:47:07,999 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-22 15:47:07,999 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-22 15:47:08,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-22 15:47:08,000 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:47:08,000 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1] [2018-10-22 15:47:08,000 INFO L424 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:47:08,001 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:47:08,001 INFO L82 PathProgramCache]: Analyzing trace with hash -1664338995, now seen corresponding path program 14 times [2018-10-22 15:47:08,001 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:47:08,001 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:47:08,002 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:47:08,002 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:47:08,002 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:47:08,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:47:09,334 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:47:09,334 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:47:09,334 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 [2018-10-22 15:47:09,343 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:47:09,365 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:47:09,366 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:47:09,370 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:47:09,400 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:47:09,428 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:47:09,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 31 [2018-10-22 15:47:09,428 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-22 15:47:09,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-22 15:47:09,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-10-22 15:47:09,429 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 31 states. [2018-10-22 15:47:10,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:47:10,597 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-10-22 15:47:10,598 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-22 15:47:10,598 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 49 [2018-10-22 15:47:10,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:47:10,599 INFO L225 Difference]: With dead ends: 58 [2018-10-22 15:47:10,599 INFO L226 Difference]: Without dead ends: 54 [2018-10-22 15:47:10,601 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=171, Invalid=3251, Unknown=0, NotChecked=0, Total=3422 [2018-10-22 15:47:10,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-22 15:47:10,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-10-22 15:47:10,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-22 15:47:10,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-10-22 15:47:10,607 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 49 [2018-10-22 15:47:10,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:47:10,607 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-10-22 15:47:10,607 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-22 15:47:10,607 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-10-22 15:47:10,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-22 15:47:10,608 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:47:10,608 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1] [2018-10-22 15:47:10,608 INFO L424 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:47:10,609 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:47:10,609 INFO L82 PathProgramCache]: Analyzing trace with hash 425733611, now seen corresponding path program 15 times [2018-10-22 15:47:10,609 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:47:10,609 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:47:10,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:47:10,610 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:47:10,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:47:10,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:47:11,991 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:47:11,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:47:11,992 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 [2018-10-22 15:47:12,003 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:48:45,503 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 15:48:45,503 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:48:45,813 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:48:45,850 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:45,855 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:48:45,855 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 33 [2018-10-22 15:48:45,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-22 15:48:45,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-22 15:48:45,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 15:48:45,857 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 33 states. [2018-10-22 15:48:47,079 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-22 15:48:47,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:48:47,548 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-10-22 15:48:47,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-22 15:48:47,549 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 52 [2018-10-22 15:48:47,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:48:47,550 INFO L225 Difference]: With dead ends: 61 [2018-10-22 15:48:47,550 INFO L226 Difference]: Without dead ends: 57 [2018-10-22 15:48:47,551 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=183, Invalid=3723, Unknown=0, NotChecked=0, Total=3906 [2018-10-22 15:48:47,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-22 15:48:47,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-10-22 15:48:47,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-22 15:48:47,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-22 15:48:47,557 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 52 [2018-10-22 15:48:47,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:48:47,558 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-22 15:48:47,558 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-22 15:48:47,558 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-22 15:48:47,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-22 15:48:47,559 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:48:47,559 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1] [2018-10-22 15:48:47,559 INFO L424 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:48:47,559 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:48:47,559 INFO L82 PathProgramCache]: Analyzing trace with hash 1637848845, now seen corresponding path program 16 times [2018-10-22 15:48:47,560 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:48:47,560 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:48:47,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:47,560 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:48:47,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:47,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:48:48,638 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:48,638 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:48:48,638 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 [2018-10-22 15:48:48,646 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:48:48,675 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:48:48,675 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:48:48,679 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:48:48,721 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:48,741 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:48:48,741 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 35 [2018-10-22 15:48:48,742 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-22 15:48:48,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-22 15:48:48,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 15:48:48,743 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 35 states. [2018-10-22 15:48:50,258 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-10-22 15:48:51,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:48:51,062 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2018-10-22 15:48:51,063 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-22 15:48:51,063 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 55 [2018-10-22 15:48:51,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:48:51,064 INFO L225 Difference]: With dead ends: 64 [2018-10-22 15:48:51,064 INFO L226 Difference]: Without dead ends: 60 [2018-10-22 15:48:51,066 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=195, Invalid=4227, Unknown=0, NotChecked=0, Total=4422 [2018-10-22 15:48:51,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-22 15:48:51,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2018-10-22 15:48:51,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-22 15:48:51,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-10-22 15:48:51,070 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 55 [2018-10-22 15:48:51,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:48:51,070 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-10-22 15:48:51,070 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-22 15:48:51,070 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-10-22 15:48:51,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-22 15:48:51,071 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:48:51,071 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1] [2018-10-22 15:48:51,071 INFO L424 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:48:51,072 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:48:51,072 INFO L82 PathProgramCache]: Analyzing trace with hash -322239829, now seen corresponding path program 17 times [2018-10-22 15:48:51,072 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:48:51,072 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:48:51,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:51,073 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:48:51,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:51,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:48:51,860 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:51,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:48:51,860 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 [2018-10-22 15:48:51,868 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown