./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id_i15_o15_true-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aa418289 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i15_o15_true-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 946ca263ceeb3f3c46f4e6e15a44f3d7052d43ca ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-aa41828 [2018-11-22 22:16:01,091 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-22 22:16:01,092 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-22 22:16:01,099 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-22 22:16:01,100 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-22 22:16:01,100 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-22 22:16:01,101 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-22 22:16:01,102 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-22 22:16:01,103 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-22 22:16:01,104 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-22 22:16:01,104 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-22 22:16:01,105 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-22 22:16:01,105 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-22 22:16:01,106 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-22 22:16:01,107 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-22 22:16:01,107 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-22 22:16:01,108 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-22 22:16:01,109 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-22 22:16:01,110 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-22 22:16:01,112 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-22 22:16:01,112 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-22 22:16:01,113 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-22 22:16:01,115 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-22 22:16:01,115 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-22 22:16:01,115 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-22 22:16:01,116 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-22 22:16:01,117 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-22 22:16:01,117 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-22 22:16:01,118 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-22 22:16:01,119 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-22 22:16:01,119 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-22 22:16:01,119 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-22 22:16:01,120 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-22 22:16:01,120 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-22 22:16:01,121 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-22 22:16:01,121 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-22 22:16:01,121 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2018-11-22 22:16:01,132 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-22 22:16:01,132 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-22 22:16:01,133 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-22 22:16:01,133 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-11-22 22:16:01,134 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-11-22 22:16:01,134 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-11-22 22:16:01,134 INFO L133 SettingsManager]: * Use SBE=true [2018-11-22 22:16:01,134 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-22 22:16:01,135 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-22 22:16:01,135 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-22 22:16:01,135 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-22 22:16:01,135 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-22 22:16:01,135 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-22 22:16:01,135 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-22 22:16:01,136 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-22 22:16:01,136 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-22 22:16:01,136 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-22 22:16:01,136 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-22 22:16:01,136 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-22 22:16:01,136 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-22 22:16:01,136 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-22 22:16:01,137 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-22 22:16:01,137 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-22 22:16:01,137 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-22 22:16:01,137 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-22 22:16:01,137 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-22 22:16:01,137 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-22 22:16:01,138 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-11-22 22:16:01,138 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-22 22:16:01,138 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-22 22:16:01,138 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 946ca263ceeb3f3c46f4e6e15a44f3d7052d43ca [2018-11-22 22:16:01,165 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-22 22:16:01,175 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-22 22:16:01,178 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-22 22:16:01,179 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-22 22:16:01,179 INFO L276 PluginConnector]: CDTParser initialized [2018-11-22 22:16:01,180 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/../../sv-benchmarks/c/recursive-simple/id_i15_o15_true-unreach-call_true-termination.c [2018-11-22 22:16:01,223 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/data/8b614caa6/c95f22fd8ec148ad95de42d5bfcb2c5a/FLAG5ebbbaa4d [2018-11-22 22:16:01,580 INFO L307 CDTParser]: Found 1 translation units. [2018-11-22 22:16:01,580 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/sv-benchmarks/c/recursive-simple/id_i15_o15_true-unreach-call_true-termination.c [2018-11-22 22:16:01,586 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/data/8b614caa6/c95f22fd8ec148ad95de42d5bfcb2c5a/FLAG5ebbbaa4d [2018-11-22 22:16:01,986 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/data/8b614caa6/c95f22fd8ec148ad95de42d5bfcb2c5a [2018-11-22 22:16:01,988 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-22 22:16:01,989 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-22 22:16:01,990 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-22 22:16:01,990 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-22 22:16:01,993 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-22 22:16:01,994 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 10:16:01" (1/1) ... [2018-11-22 22:16:01,996 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4bb4fcbe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:16:01, skipping insertion in model container [2018-11-22 22:16:01,996 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 10:16:01" (1/1) ... [2018-11-22 22:16:02,002 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-22 22:16:02,012 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-22 22:16:02,126 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-22 22:16:02,128 INFO L191 MainTranslator]: Completed pre-run [2018-11-22 22:16:02,138 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-22 22:16:02,147 INFO L195 MainTranslator]: Completed translation [2018-11-22 22:16:02,147 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:16:02 WrapperNode [2018-11-22 22:16:02,147 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-22 22:16:02,148 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-22 22:16:02,148 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-22 22:16:02,148 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-22 22:16:02,153 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:16:02" (1/1) ... [2018-11-22 22:16:02,157 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:16:02" (1/1) ... [2018-11-22 22:16:02,161 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-22 22:16:02,161 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-22 22:16:02,161 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-22 22:16:02,161 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-22 22:16:02,167 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:16:02" (1/1) ... [2018-11-22 22:16:02,167 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:16:02" (1/1) ... [2018-11-22 22:16:02,168 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:16:02" (1/1) ... [2018-11-22 22:16:02,168 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:16:02" (1/1) ... [2018-11-22 22:16:02,170 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:16:02" (1/1) ... [2018-11-22 22:16:02,171 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:16:02" (1/1) ... [2018-11-22 22:16:02,172 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:16:02" (1/1) ... [2018-11-22 22:16:02,172 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-22 22:16:02,173 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-22 22:16:02,173 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-22 22:16:02,173 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-22 22:16:02,173 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:16:02" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:02,259 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-22 22:16:02,259 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-22 22:16:02,259 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-22 22:16:02,259 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-22 22:16:02,259 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-22 22:16:02,259 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-22 22:16:02,259 INFO L130 BoogieDeclarations]: Found specification of procedure id [2018-11-22 22:16:02,259 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2018-11-22 22:16:02,361 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-22 22:16:02,361 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-11-22 22:16:02,361 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 10:16:02 BoogieIcfgContainer [2018-11-22 22:16:02,361 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-22 22:16:02,362 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-22 22:16:02,362 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-22 22:16:02,364 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-22 22:16:02,364 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 10:16:01" (1/3) ... [2018-11-22 22:16:02,365 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e61eb87 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 10:16:02, skipping insertion in model container [2018-11-22 22:16:02,365 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:16:02" (2/3) ... [2018-11-22 22:16:02,365 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e61eb87 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 10:16:02, skipping insertion in model container [2018-11-22 22:16:02,365 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 10:16:02" (3/3) ... [2018-11-22 22:16:02,367 INFO L112 eAbstractionObserver]: Analyzing ICFG id_i15_o15_true-unreach-call_true-termination.c [2018-11-22 22:16:02,373 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-22 22:16:02,379 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-22 22:16:02,391 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-22 22:16:02,413 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-11-22 22:16:02,414 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-22 22:16:02,414 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-22 22:16:02,414 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-22 22:16:02,414 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-22 22:16:02,414 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-22 22:16:02,414 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-22 22:16:02,414 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-22 22:16:02,415 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-22 22:16:02,426 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-11-22 22:16:02,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-22 22:16:02,431 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:02,431 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:02,433 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:02,437 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:02,437 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2018-11-22 22:16:02,438 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:02,439 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:02,473 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:02,474 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:16:02,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:02,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:02,560 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-22 22:16:02,563 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-22 22:16:02,563 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-22 22:16:02,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-22 22:16:02,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-22 22:16:02,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-22 22:16:02,583 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-11-22 22:16:02,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:02,647 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-11-22 22:16:02,647 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-22 22:16:02,648 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-11-22 22:16:02,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:02,654 INFO L225 Difference]: With dead ends: 30 [2018-11-22 22:16:02,654 INFO L226 Difference]: Without dead ends: 18 [2018-11-22 22:16:02,656 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-11-22 22:16:02,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-22 22:16:02,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-11-22 22:16:02,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-22 22:16:02,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-11-22 22:16:02,684 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-11-22 22:16:02,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:02,685 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-11-22 22:16:02,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-22 22:16:02,685 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-11-22 22:16:02,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-22 22:16:02,686 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:02,686 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:02,686 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:02,687 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:02,687 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2018-11-22 22:16:02,687 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:02,687 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:02,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:02,688 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:16:02,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:02,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:02,728 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-22 22:16:02,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:16:02,729 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:02,741 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:16:02,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:02,756 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:16:02,782 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-22 22:16:02,798 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-22 22:16:02,798 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-11-22 22:16:02,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-22 22:16:02,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-22 22:16:02,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-11-22 22:16:02,799 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-11-22 22:16:02,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:02,859 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-11-22 22:16:02,859 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-22 22:16:02,860 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-11-22 22:16:02,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:02,860 INFO L225 Difference]: With dead ends: 25 [2018-11-22 22:16:02,860 INFO L226 Difference]: Without dead ends: 21 [2018-11-22 22:16:02,861 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-11-22 22:16:02,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-22 22:16:02,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-11-22 22:16:02,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-22 22:16:02,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-22 22:16:02,864 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-11-22 22:16:02,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:02,864 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-22 22:16:02,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-22 22:16:02,865 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-22 22:16:02,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-11-22 22:16:02,865 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:02,865 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:02,865 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:02,866 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:02,866 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2018-11-22 22:16:02,866 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:02,866 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:02,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:02,867 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:16:02,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:02,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:02,940 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-22 22:16:02,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:16:02,940 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:02,958 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-22 22:16:02,975 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-22 22:16:02,975 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:16:02,978 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:16:02,999 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-22 22:16:03,020 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-22 22:16:03,020 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-11-22 22:16:03,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-22 22:16:03,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-22 22:16:03,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-11-22 22:16:03,021 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-11-22 22:16:03,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:03,086 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-11-22 22:16:03,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-22 22:16:03,087 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-11-22 22:16:03,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:03,088 INFO L225 Difference]: With dead ends: 28 [2018-11-22 22:16:03,088 INFO L226 Difference]: Without dead ends: 24 [2018-11-22 22:16:03,088 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2018-11-22 22:16:03,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-22 22:16:03,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-22 22:16:03,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-22 22:16:03,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-22 22:16:03,092 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-11-22 22:16:03,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:03,092 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-22 22:16:03,092 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-22 22:16:03,093 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-22 22:16:03,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-11-22 22:16:03,093 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:03,093 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:03,094 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:03,094 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:03,094 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2018-11-22 22:16:03,094 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:03,095 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:03,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:03,096 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:16:03,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:03,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:03,171 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-22 22:16:03,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:16:03,171 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:03,189 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:16:03,211 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-11-22 22:16:03,211 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:16:03,213 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:16:03,238 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-22 22:16:03,255 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-22 22:16:03,256 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-11-22 22:16:03,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-22 22:16:03,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-22 22:16:03,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-11-22 22:16:03,257 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2018-11-22 22:16:03,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:03,327 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-11-22 22:16:03,327 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-22 22:16:03,328 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-11-22 22:16:03,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:03,328 INFO L225 Difference]: With dead ends: 31 [2018-11-22 22:16:03,328 INFO L226 Difference]: Without dead ends: 27 [2018-11-22 22:16:03,330 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2018-11-22 22:16:03,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-22 22:16:03,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-11-22 22:16:03,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-22 22:16:03,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-11-22 22:16:03,334 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-11-22 22:16:03,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:03,335 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-11-22 22:16:03,335 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-22 22:16:03,335 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-11-22 22:16:03,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-11-22 22:16:03,336 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:03,336 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:03,336 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:03,336 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:03,337 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2018-11-22 22:16:03,337 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:03,339 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:03,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:03,340 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:16:03,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:03,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:03,417 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-22 22:16:03,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:16:03,417 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:03,438 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:16:03,455 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:16:03,455 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:16:03,459 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:16:03,477 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-22 22:16:03,498 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-22 22:16:03,499 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-11-22 22:16:03,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-22 22:16:03,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-22 22:16:03,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2018-11-22 22:16:03,500 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-11-22 22:16:03,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:03,603 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-11-22 22:16:03,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-22 22:16:03,603 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-11-22 22:16:03,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:03,604 INFO L225 Difference]: With dead ends: 34 [2018-11-22 22:16:03,604 INFO L226 Difference]: Without dead ends: 30 [2018-11-22 22:16:03,605 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2018-11-22 22:16:03,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-22 22:16:03,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-11-22 22:16:03,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-22 22:16:03,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-11-22 22:16:03,610 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-11-22 22:16:03,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:03,610 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-11-22 22:16:03,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-22 22:16:03,610 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-11-22 22:16:03,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-11-22 22:16:03,611 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:03,611 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:03,611 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:03,612 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:03,612 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2018-11-22 22:16:03,612 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:03,612 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:03,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:03,613 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:16:03,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:03,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:03,690 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-22 22:16:03,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:16:03,691 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:03,709 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-11-22 22:16:03,726 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-11-22 22:16:03,726 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:16:03,728 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:16:03,744 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-22 22:16:03,761 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-22 22:16:03,761 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-11-22 22:16:03,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-22 22:16:03,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-22 22:16:03,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2018-11-22 22:16:03,762 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2018-11-22 22:16:03,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:03,845 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-11-22 22:16:03,849 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-22 22:16:03,850 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2018-11-22 22:16:03,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:03,851 INFO L225 Difference]: With dead ends: 37 [2018-11-22 22:16:03,851 INFO L226 Difference]: Without dead ends: 33 [2018-11-22 22:16:03,851 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2018-11-22 22:16:03,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-22 22:16:03,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-11-22 22:16:03,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-11-22 22:16:03,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-11-22 22:16:03,856 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-11-22 22:16:03,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:03,857 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-11-22 22:16:03,857 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-22 22:16:03,857 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-11-22 22:16:03,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-11-22 22:16:03,858 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:03,858 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:03,859 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:03,859 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:03,859 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2018-11-22 22:16:03,859 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:03,859 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:03,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:03,860 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:16:03,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:03,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:03,994 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-22 22:16:03,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:16:03,995 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:04,011 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-11-22 22:16:04,027 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-11-22 22:16:04,027 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:16:04,030 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:16:04,047 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-22 22:16:04,065 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-22 22:16:04,065 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-11-22 22:16:04,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-22 22:16:04,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-22 22:16:04,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2018-11-22 22:16:04,066 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2018-11-22 22:16:04,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:04,138 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-11-22 22:16:04,138 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-22 22:16:04,138 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2018-11-22 22:16:04,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:04,139 INFO L225 Difference]: With dead ends: 40 [2018-11-22 22:16:04,139 INFO L226 Difference]: Without dead ends: 36 [2018-11-22 22:16:04,140 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=110, Invalid=196, Unknown=0, NotChecked=0, Total=306 [2018-11-22 22:16:04,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-22 22:16:04,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-11-22 22:16:04,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-22 22:16:04,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-11-22 22:16:04,144 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-11-22 22:16:04,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:04,144 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-11-22 22:16:04,144 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-22 22:16:04,144 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-11-22 22:16:04,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-11-22 22:16:04,145 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:04,145 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:04,146 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:04,146 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:04,146 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2018-11-22 22:16:04,146 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:04,146 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:04,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:04,147 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:16:04,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:04,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:04,232 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-22 22:16:04,232 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:16:04,232 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:04,239 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:16:04,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:04,252 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:16:04,266 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-22 22:16:04,281 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-22 22:16:04,281 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-11-22 22:16:04,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-22 22:16:04,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-22 22:16:04,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2018-11-22 22:16:04,282 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2018-11-22 22:16:04,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:04,407 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-11-22 22:16:04,407 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-22 22:16:04,408 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2018-11-22 22:16:04,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:04,409 INFO L225 Difference]: With dead ends: 43 [2018-11-22 22:16:04,409 INFO L226 Difference]: Without dead ends: 39 [2018-11-22 22:16:04,409 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=137, Invalid=243, Unknown=0, NotChecked=0, Total=380 [2018-11-22 22:16:04,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-22 22:16:04,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-11-22 22:16:04,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-22 22:16:04,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-11-22 22:16:04,413 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-11-22 22:16:04,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:04,414 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-11-22 22:16:04,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-22 22:16:04,414 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-11-22 22:16:04,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-11-22 22:16:04,414 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:04,415 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:04,415 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:04,415 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:04,415 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2018-11-22 22:16:04,415 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:04,415 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:04,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:04,416 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:16:04,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:04,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:04,542 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-22 22:16:04,542 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:16:04,542 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:04,549 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-22 22:16:04,564 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-22 22:16:04,564 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:16:04,567 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:16:04,591 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-22 22:16:04,608 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-22 22:16:04,608 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-11-22 22:16:04,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-22 22:16:04,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-22 22:16:04,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2018-11-22 22:16:04,608 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2018-11-22 22:16:04,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:04,690 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-11-22 22:16:04,690 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-22 22:16:04,691 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-11-22 22:16:04,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:04,692 INFO L225 Difference]: With dead ends: 46 [2018-11-22 22:16:04,692 INFO L226 Difference]: Without dead ends: 42 [2018-11-22 22:16:04,692 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2018-11-22 22:16:04,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-11-22 22:16:04,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-11-22 22:16:04,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-22 22:16:04,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-11-22 22:16:04,698 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-11-22 22:16:04,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:04,699 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-11-22 22:16:04,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-22 22:16:04,699 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-11-22 22:16:04,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-11-22 22:16:04,700 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:04,700 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:04,700 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:04,700 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:04,700 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2018-11-22 22:16:04,700 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:04,701 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:04,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:04,701 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:16:04,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:04,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:04,808 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-22 22:16:04,808 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:16:04,809 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:04,822 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:16:04,856 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-11-22 22:16:04,856 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:16:04,859 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:16:04,881 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-22 22:16:04,909 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-22 22:16:04,909 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-11-22 22:16:04,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-22 22:16:04,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-22 22:16:04,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2018-11-22 22:16:04,910 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2018-11-22 22:16:05,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:05,050 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-11-22 22:16:05,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-22 22:16:05,050 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-11-22 22:16:05,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:05,051 INFO L225 Difference]: With dead ends: 49 [2018-11-22 22:16:05,051 INFO L226 Difference]: Without dead ends: 45 [2018-11-22 22:16:05,052 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2018-11-22 22:16:05,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-22 22:16:05,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-11-22 22:16:05,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-22 22:16:05,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-11-22 22:16:05,055 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-11-22 22:16:05,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:05,055 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-11-22 22:16:05,055 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-22 22:16:05,055 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-11-22 22:16:05,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-11-22 22:16:05,056 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:05,056 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:05,056 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:05,057 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:05,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2018-11-22 22:16:05,057 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:05,057 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:05,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:05,058 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:16:05,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:05,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:05,180 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-22 22:16:05,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:16:05,180 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:05,188 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:16:05,209 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:16:05,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:16:05,212 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:16:05,238 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-22 22:16:05,262 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-22 22:16:05,262 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-11-22 22:16:05,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-22 22:16:05,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-22 22:16:05,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=128, Unknown=0, NotChecked=0, Total=210 [2018-11-22 22:16:05,263 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2018-11-22 22:16:05,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:05,450 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2018-11-22 22:16:05,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-22 22:16:05,452 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2018-11-22 22:16:05,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:05,453 INFO L225 Difference]: With dead ends: 52 [2018-11-22 22:16:05,453 INFO L226 Difference]: Without dead ends: 48 [2018-11-22 22:16:05,454 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=236, Invalid=414, Unknown=0, NotChecked=0, Total=650 [2018-11-22 22:16:05,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-11-22 22:16:05,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-11-22 22:16:05,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-11-22 22:16:05,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-11-22 22:16:05,460 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2018-11-22 22:16:05,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:05,460 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-11-22 22:16:05,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-22 22:16:05,460 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-11-22 22:16:05,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-22 22:16:05,461 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:05,461 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:05,462 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:05,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:05,462 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2018-11-22 22:16:05,462 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:05,462 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:05,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:05,463 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:16:05,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:05,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:05,600 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-22 22:16:05,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:16:05,601 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:05,607 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-11-22 22:16:05,627 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-11-22 22:16:05,627 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:16:05,629 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:16:05,652 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-22 22:16:05,670 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-22 22:16:05,670 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-11-22 22:16:05,671 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-22 22:16:05,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-22 22:16:05,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2018-11-22 22:16:05,671 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2018-11-22 22:16:05,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:05,815 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-11-22 22:16:05,816 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-22 22:16:05,816 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2018-11-22 22:16:05,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:05,817 INFO L225 Difference]: With dead ends: 55 [2018-11-22 22:16:05,817 INFO L226 Difference]: Without dead ends: 51 [2018-11-22 22:16:05,818 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=275, Invalid=481, Unknown=0, NotChecked=0, Total=756 [2018-11-22 22:16:05,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-11-22 22:16:05,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-11-22 22:16:05,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-11-22 22:16:05,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-11-22 22:16:05,824 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2018-11-22 22:16:05,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:05,824 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-11-22 22:16:05,824 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-22 22:16:05,825 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-11-22 22:16:05,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-11-22 22:16:05,828 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:05,828 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:05,828 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:05,828 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:05,828 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2018-11-22 22:16:05,828 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:05,828 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:05,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:05,829 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:16:05,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:05,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:05,947 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-22 22:16:05,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:16:05,948 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:05,957 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-11-22 22:16:05,996 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-11-22 22:16:05,996 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:16:05,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:16:06,022 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-22 22:16:06,037 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-22 22:16:06,038 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-11-22 22:16:06,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-22 22:16:06,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-22 22:16:06,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=163, Unknown=0, NotChecked=0, Total=272 [2018-11-22 22:16:06,038 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2018-11-22 22:16:06,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:06,185 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2018-11-22 22:16:06,185 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-22 22:16:06,185 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2018-11-22 22:16:06,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:06,186 INFO L225 Difference]: With dead ends: 58 [2018-11-22 22:16:06,186 INFO L226 Difference]: Without dead ends: 54 [2018-11-22 22:16:06,186 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=317, Invalid=553, Unknown=0, NotChecked=0, Total=870 [2018-11-22 22:16:06,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-22 22:16:06,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-11-22 22:16:06,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-11-22 22:16:06,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-11-22 22:16:06,190 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2018-11-22 22:16:06,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:06,190 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-11-22 22:16:06,190 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-22 22:16:06,190 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-11-22 22:16:06,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-11-22 22:16:06,191 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:06,191 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:06,191 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:06,191 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:06,191 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2018-11-22 22:16:06,191 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:06,191 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:06,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:06,192 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:16:06,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:06,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:06,300 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-22 22:16:06,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:16:06,301 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:06,307 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:16:06,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:06,321 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:16:06,350 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-22 22:16:06,372 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-22 22:16:06,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-11-22 22:16:06,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-22 22:16:06,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-22 22:16:06,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2018-11-22 22:16:06,373 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2018-11-22 22:16:06,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:06,540 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-11-22 22:16:06,540 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-22 22:16:06,540 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2018-11-22 22:16:06,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:06,541 INFO L225 Difference]: With dead ends: 61 [2018-11-22 22:16:06,541 INFO L226 Difference]: Without dead ends: 57 [2018-11-22 22:16:06,541 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=362, Invalid=630, Unknown=0, NotChecked=0, Total=992 [2018-11-22 22:16:06,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-22 22:16:06,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-11-22 22:16:06,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-11-22 22:16:06,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-11-22 22:16:06,544 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2018-11-22 22:16:06,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:06,545 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-11-22 22:16:06,545 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-22 22:16:06,545 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-11-22 22:16:06,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-11-22 22:16:06,546 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:06,546 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:06,546 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:06,546 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:06,546 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2018-11-22 22:16:06,546 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:06,546 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:06,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:06,547 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:16:06,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:06,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:06,648 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-22 22:16:06,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:16:06,648 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:06,654 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-22 22:16:06,667 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-22 22:16:06,668 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:16:06,669 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:16:06,685 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-22 22:16:06,709 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-22 22:16:06,709 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-11-22 22:16:06,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-22 22:16:06,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-22 22:16:06,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=202, Unknown=0, NotChecked=0, Total=342 [2018-11-22 22:16:06,710 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2018-11-22 22:16:06,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:06,848 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2018-11-22 22:16:06,848 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-22 22:16:06,849 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2018-11-22 22:16:06,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:06,849 INFO L225 Difference]: With dead ends: 64 [2018-11-22 22:16:06,849 INFO L226 Difference]: Without dead ends: 60 [2018-11-22 22:16:06,850 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=410, Invalid=712, Unknown=0, NotChecked=0, Total=1122 [2018-11-22 22:16:06,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-11-22 22:16:06,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-11-22 22:16:06,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-11-22 22:16:06,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-11-22 22:16:06,853 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2018-11-22 22:16:06,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:06,853 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-11-22 22:16:06,853 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-22 22:16:06,853 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-11-22 22:16:06,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-11-22 22:16:06,854 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:06,854 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:06,854 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:06,854 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:06,854 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2018-11-22 22:16:06,855 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:06,855 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:06,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:06,855 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:16:06,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:06,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:07,266 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-11-22 22:16:07,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:16:07,266 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/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 [2018-11-22 22:16:07,274 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:16:07,298 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-11-22 22:16:07,298 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:16:07,301 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:16:07,342 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-11-22 22:16:07,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-22 22:16:07,362 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 35 [2018-11-22 22:16:07,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-11-22 22:16:07,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-11-22 22:16:07,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2018-11-22 22:16:07,362 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 35 states. [2018-11-22 22:16:07,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:07,668 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-11-22 22:16:07,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-22 22:16:07,669 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 103 [2018-11-22 22:16:07,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:07,669 INFO L225 Difference]: With dead ends: 67 [2018-11-22 22:16:07,669 INFO L226 Difference]: Without dead ends: 63 [2018-11-22 22:16:07,670 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2018-11-22 22:16:07,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-11-22 22:16:07,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-11-22 22:16:07,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-11-22 22:16:07,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-11-22 22:16:07,673 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2018-11-22 22:16:07,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:07,674 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-11-22 22:16:07,674 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-11-22 22:16:07,674 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-11-22 22:16:07,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-22 22:16:07,675 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:16:07,675 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:16:07,675 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:16:07,675 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:16:07,675 INFO L82 PathProgramCache]: Analyzing trace with hash 404015613, now seen corresponding path program 16 times [2018-11-22 22:16:07,675 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-22 22:16:07,675 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-22 22:16:07,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:07,676 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:16:07,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:16:07,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:16:07,814 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 392 proven. 0 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-11-22 22:16:07,814 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-22 22:16:07,814 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2018-11-22 22:16:07,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-22 22:16:07,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-22 22:16:07,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=245, Unknown=0, NotChecked=0, Total=420 [2018-11-22 22:16:07,815 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2018-11-22 22:16:07,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:16:07,946 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-11-22 22:16:07,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-22 22:16:07,947 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2018-11-22 22:16:07,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:16:07,947 INFO L225 Difference]: With dead ends: 63 [2018-11-22 22:16:07,947 INFO L226 Difference]: Without dead ends: 0 [2018-11-22 22:16:07,948 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=515, Invalid=891, Unknown=0, NotChecked=0, Total=1406 [2018-11-22 22:16:07,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-11-22 22:16:07,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-11-22 22:16:07,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-11-22 22:16:07,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-11-22 22:16:07,948 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 109 [2018-11-22 22:16:07,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:16:07,949 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-11-22 22:16:07,949 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-22 22:16:07,949 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-11-22 22:16:07,949 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-11-22 22:16:07,953 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-11-22 22:16:07,969 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-11-22 22:16:07,969 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-11-22 22:16:07,969 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-11-22 22:16:07,969 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-11-22 22:16:07,969 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-11-22 22:16:07,969 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-11-22 22:16:07,969 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 9 15) the Hoare annotation is: true [2018-11-22 22:16:07,969 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 9 15) no Hoare annotation was computed. [2018-11-22 22:16:07,969 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) no Hoare annotation was computed. [2018-11-22 22:16:07,969 INFO L448 ceAbstractionStarter]: For program point L13(line 13) no Hoare annotation was computed. [2018-11-22 22:16:07,969 INFO L448 ceAbstractionStarter]: For program point L12(lines 12 14) no Hoare annotation was computed. [2018-11-22 22:16:07,969 INFO L444 ceAbstractionStarter]: At program point L11(line 11) the Hoare annotation is: (and (<= main_~input~0 15) (<= 15 main_~input~0)) [2018-11-22 22:16:07,970 INFO L448 ceAbstractionStarter]: For program point L11-1(line 11) no Hoare annotation was computed. [2018-11-22 22:16:07,970 INFO L448 ceAbstractionStarter]: For program point L12-2(lines 9 15) no Hoare annotation was computed. [2018-11-22 22:16:07,970 INFO L448 ceAbstractionStarter]: For program point idFINAL(lines 4 7) no Hoare annotation was computed. [2018-11-22 22:16:07,970 INFO L448 ceAbstractionStarter]: For program point idEXIT(lines 4 7) no Hoare annotation was computed. [2018-11-22 22:16:07,970 INFO L451 ceAbstractionStarter]: At program point idENTRY(lines 4 7) the Hoare annotation is: true [2018-11-22 22:16:07,970 INFO L444 ceAbstractionStarter]: At program point L6(line 6) the Hoare annotation is: (and (<= |id_#in~x| id_~x) (<= id_~x |id_#in~x|)) [2018-11-22 22:16:07,970 INFO L448 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-11-22 22:16:07,970 INFO L448 ceAbstractionStarter]: For program point L6-1(line 6) no Hoare annotation was computed. [2018-11-22 22:16:07,972 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.11 10:16:07 BoogieIcfgContainer [2018-11-22 22:16:07,972 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-22 22:16:07,972 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-22 22:16:07,972 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-22 22:16:07,972 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-22 22:16:07,972 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 10:16:02" (3/4) ... [2018-11-22 22:16:07,979 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-11-22 22:16:07,984 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-11-22 22:16:07,985 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-11-22 22:16:07,985 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure id [2018-11-22 22:16:07,987 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-11-22 22:16:07,988 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2018-11-22 22:16:07,988 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-11-22 22:16:08,015 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_4bc8b56a-8c1f-42e6-be5c-9ca09055412f/bin-2019/uautomizer/witness.graphml [2018-11-22 22:16:08,015 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-22 22:16:08,016 INFO L168 Benchmark]: Toolchain (without parser) took 6027.50 ms. Allocated memory was 1.0 GB in the beginning and 1.4 GB in the end (delta: 320.9 MB). Free memory was 959.1 MB in the beginning and 1.1 GB in the end (delta: -179.6 MB). Peak memory consumption was 141.2 MB. Max. memory is 11.5 GB. [2018-11-22 22:16:08,018 INFO L168 Benchmark]: CDTParser took 0.15 ms. Allocated memory is still 1.0 GB. Free memory is still 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-22 22:16:08,018 INFO L168 Benchmark]: CACSL2BoogieTranslator took 157.61 ms. Allocated memory is still 1.0 GB. Free memory was 959.1 MB in the beginning and 948.3 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 11.5 GB. [2018-11-22 22:16:08,018 INFO L168 Benchmark]: Boogie Procedure Inliner took 13.42 ms. Allocated memory is still 1.0 GB. Free memory is still 948.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-22 22:16:08,018 INFO L168 Benchmark]: Boogie Preprocessor took 11.38 ms. Allocated memory is still 1.0 GB. Free memory was 948.3 MB in the beginning and 945.6 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-22 22:16:08,018 INFO L168 Benchmark]: RCFGBuilder took 188.82 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 159.4 MB). Free memory was 945.6 MB in the beginning and 1.1 GB in the end (delta: -192.0 MB). Peak memory consumption was 14.0 MB. Max. memory is 11.5 GB. [2018-11-22 22:16:08,019 INFO L168 Benchmark]: TraceAbstraction took 5609.79 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 161.5 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: -1.2 MB). Peak memory consumption was 160.3 MB. Max. memory is 11.5 GB. [2018-11-22 22:16:08,019 INFO L168 Benchmark]: Witness Printer took 43.42 ms. Allocated memory is still 1.4 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-22 22:16:08,021 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15 ms. Allocated memory is still 1.0 GB. Free memory is still 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 157.61 ms. Allocated memory is still 1.0 GB. Free memory was 959.1 MB in the beginning and 948.3 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 13.42 ms. Allocated memory is still 1.0 GB. Free memory is still 948.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 11.38 ms. Allocated memory is still 1.0 GB. Free memory was 948.3 MB in the beginning and 945.6 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 188.82 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 159.4 MB). Free memory was 945.6 MB in the beginning and 1.1 GB in the end (delta: -192.0 MB). Peak memory consumption was 14.0 MB. Max. memory is 11.5 GB. * TraceAbstraction took 5609.79 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 161.5 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: -1.2 MB). Peak memory consumption was 160.3 MB. Max. memory is 11.5 GB. * Witness Printer took 43.42 ms. Allocated memory is still 1.4 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 13]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. SAFE Result, 5.5s OverallTime, 17 OverallIterations, 17 TraceHistogramMax, 2.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 285 SDtfs, 322 SDslu, 2558 SDs, 0 SdLazy, 1601 SolverSat, 19 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1394 GetRequests, 1054 SyntacticMatches, 1 SemanticMatches, 339 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 680 ImplicationChecksByTransitivity, 2.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=63occurred in iteration=16, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 17 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 19 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.1s InterpolantComputationTime, 1952 NumberOfCodeBlocks, 1952 NumberOfCodeBlocksAsserted, 98 NumberOfCheckSat, 1920 ConstructedInterpolants, 0 QuantifiedInterpolants, 377952 SizeOfPredicates, 134 NumberOfNonLiveVariables, 2145 ConjunctsInSsa, 333 ConjunctsInUnsatCore, 32 InterpolantComputations, 2 PerfectInterpolantSequences, 4624/8464 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...