./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/minepump_spec1_product30.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/bin/ukojak/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/bin/ukojak/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/bin/ukojak/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/bin/ukojak/config/KojakReach.xml -i ../../sv-benchmarks/c/product-lines/minepump_spec1_product30.cil.c -s /tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/bin/ukojak/config/svcomp-Reach-32bit-Kojak_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/bin/ukojak --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Kojak --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ebcff49133dade640f52684ce96120818f74fe08 ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-28 04:37:54,962 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 04:37:54,965 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 04:37:55,023 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 04:37:55,024 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 04:37:55,030 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 04:37:55,033 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 04:37:55,038 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 04:37:55,041 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 04:37:55,047 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 04:37:55,049 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 04:37:55,051 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 04:37:55,052 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 04:37:55,056 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 04:37:55,058 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 04:37:55,061 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 04:37:55,062 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 04:37:55,066 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 04:37:55,070 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 04:37:55,078 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 04:37:55,080 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 04:37:55,082 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 04:37:55,085 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 04:37:55,086 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 04:37:55,095 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 04:37:55,096 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 04:37:55,096 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 04:37:55,099 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 04:37:55,099 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 04:37:55,101 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 04:37:55,101 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 04:37:55,103 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 04:37:55,105 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 04:37:55,107 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 04:37:55,108 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 04:37:55,109 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 04:37:55,110 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 04:37:55,110 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 04:37:55,111 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 04:37:55,112 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 04:37:55,114 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 04:37:55,117 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/bin/ukojak/config/svcomp-Reach-32bit-Kojak_Default.epf [2020-11-28 04:37:55,156 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 04:37:55,156 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 04:37:55,158 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-28 04:37:55,158 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ALWAYS [2020-11-28 04:37:55,159 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-28 04:37:55,160 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-28 04:37:55,160 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 04:37:55,160 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 04:37:55,161 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 04:37:55,161 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 04:37:55,162 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 04:37:55,163 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-28 04:37:55,163 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 04:37:55,163 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-28 04:37:55,164 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 04:37:55,164 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 04:37:55,164 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 04:37:55,165 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-28 04:37:55,165 INFO L136 SettingsManager]: Preferences of CodeCheck differ from their defaults: [2020-11-28 04:37:55,165 INFO L138 SettingsManager]: * Timeout in seconds=1000000 [2020-11-28 04:37:55,165 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 04:37:55,166 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 04:37:55,166 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2020-11-28 04:37:55,166 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 04:37:55,167 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 04:37:55,167 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-28 04:37:55,167 INFO L138 SettingsManager]: * Trace refinement strategy=PENGUIN [2020-11-28 04:37:55,168 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 04:37:55,168 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-28 04:37:55,170 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/bin/ukojak/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/bin/ukojak Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Kojak Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ebcff49133dade640f52684ce96120818f74fe08 [2020-11-28 04:37:55,502 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 04:37:55,549 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 04:37:55,553 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 04:37:55,554 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 04:37:55,555 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 04:37:55,556 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/bin/ukojak/../../sv-benchmarks/c/product-lines/minepump_spec1_product30.cil.c [2020-11-28 04:37:55,630 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/bin/ukojak/data/ed5174c65/6d97a11a2df14ff4b0dad2a9fbe333c4/FLAG737b700ad [2020-11-28 04:37:56,254 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 04:37:56,255 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/sv-benchmarks/c/product-lines/minepump_spec1_product30.cil.c [2020-11-28 04:37:56,274 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/bin/ukojak/data/ed5174c65/6d97a11a2df14ff4b0dad2a9fbe333c4/FLAG737b700ad [2020-11-28 04:37:56,537 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/bin/ukojak/data/ed5174c65/6d97a11a2df14ff4b0dad2a9fbe333c4 [2020-11-28 04:37:56,540 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 04:37:56,541 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 04:37:56,555 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 04:37:56,555 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 04:37:56,558 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 04:37:56,559 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 04:37:56" (1/1) ... [2020-11-28 04:37:56,561 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@364c7c8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 04:37:56, skipping insertion in model container [2020-11-28 04:37:56,562 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 04:37:56" (1/1) ... [2020-11-28 04:37:56,570 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 04:37:56,635 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 04:37:57,015 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 04:37:57,040 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 04:37:57,168 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 04:37:57,216 INFO L208 MainTranslator]: Completed translation [2020-11-28 04:37:57,217 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 04:37:57 WrapperNode [2020-11-28 04:37:57,217 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 04:37:57,218 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 04:37:57,219 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 04:37:57,219 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 04:37:57,227 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 04:37:57" (1/1) ... [2020-11-28 04:37:57,257 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 04:37:57" (1/1) ... [2020-11-28 04:37:57,307 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 04:37:57,309 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 04:37:57,309 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 04:37:57,310 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 04:37:57,318 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 04:37:57" (1/1) ... [2020-11-28 04:37:57,318 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 04:37:57" (1/1) ... [2020-11-28 04:37:57,333 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 04:37:57" (1/1) ... [2020-11-28 04:37:57,333 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 04:37:57" (1/1) ... [2020-11-28 04:37:57,341 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 04:37:57" (1/1) ... [2020-11-28 04:37:57,362 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 04:37:57" (1/1) ... [2020-11-28 04:37:57,364 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 04:37:57" (1/1) ... [2020-11-28 04:37:57,367 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 04:37:57,368 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 04:37:57,368 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 04:37:57,368 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 04:37:57,376 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 04:37:57" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/bin/ukojak/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (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:10000 [2020-11-28 04:37:57,453 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 04:37:57,454 INFO L130 BoogieDeclarations]: Found specification of procedure processEnvironment__wrappee__base [2020-11-28 04:37:57,454 INFO L138 BoogieDeclarations]: Found implementation of procedure processEnvironment__wrappee__base [2020-11-28 04:37:57,455 INFO L130 BoogieDeclarations]: Found specification of procedure isMethaneLevelCritical [2020-11-28 04:37:57,455 INFO L138 BoogieDeclarations]: Found implementation of procedure isMethaneLevelCritical [2020-11-28 04:37:57,455 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2020-11-28 04:37:57,455 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2020-11-28 04:37:57,455 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2020-11-28 04:37:57,456 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2020-11-28 04:37:57,456 INFO L130 BoogieDeclarations]: Found specification of procedure waterRise [2020-11-28 04:37:57,457 INFO L138 BoogieDeclarations]: Found implementation of procedure waterRise [2020-11-28 04:37:57,457 INFO L130 BoogieDeclarations]: Found specification of procedure processEnvironment__wrappee__methaneQuery [2020-11-28 04:37:57,457 INFO L138 BoogieDeclarations]: Found implementation of procedure processEnvironment__wrappee__methaneQuery [2020-11-28 04:37:57,457 INFO L130 BoogieDeclarations]: Found specification of procedure isMethaneAlarm [2020-11-28 04:37:57,457 INFO L138 BoogieDeclarations]: Found implementation of procedure isMethaneAlarm [2020-11-28 04:37:57,457 INFO L130 BoogieDeclarations]: Found specification of procedure deactivatePump [2020-11-28 04:37:57,457 INFO L138 BoogieDeclarations]: Found implementation of procedure deactivatePump [2020-11-28 04:37:57,457 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-28 04:37:57,458 INFO L130 BoogieDeclarations]: Found specification of procedure changeMethaneLevel [2020-11-28 04:37:57,458 INFO L138 BoogieDeclarations]: Found implementation of procedure changeMethaneLevel [2020-11-28 04:37:57,458 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 04:37:57,458 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 04:37:58,912 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 04:37:58,912 INFO L298 CfgBuilder]: Removed 36 assume(true) statements. [2020-11-28 04:37:58,914 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 04:37:58 BoogieIcfgContainer [2020-11-28 04:37:58,914 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 04:37:58,915 INFO L113 PluginConnector]: ------------------------CodeCheck---------------------------- [2020-11-28 04:37:58,915 INFO L271 PluginConnector]: Initializing CodeCheck... [2020-11-28 04:37:58,926 INFO L275 PluginConnector]: CodeCheck initialized [2020-11-28 04:37:58,927 INFO L185 PluginConnector]: Executing the observer CodeCheckObserver from plugin CodeCheck for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 04:37:58" (1/1) ... [2020-11-28 04:37:58,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 04:37:58,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:37:58,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 63 states and 82 transitions. [2020-11-28 04:37:58,983 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 82 transitions. [2020-11-28 04:37:58,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-11-28 04:37:58,988 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:37:59,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:37:59,305 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 04:37:59,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:37:59,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 63 states and 80 transitions. [2020-11-28 04:37:59,319 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 80 transitions. [2020-11-28 04:37:59,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-11-28 04:37:59,320 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:37:59,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:37:59,433 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 04:37:59,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:37:59,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 65 states and 83 transitions. [2020-11-28 04:37:59,472 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 83 transitions. [2020-11-28 04:37:59,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-11-28 04:37:59,475 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:37:59,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:37:59,664 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 04:38:00,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:00,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 78 states and 109 transitions. [2020-11-28 04:38:00,181 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 109 transitions. [2020-11-28 04:38:00,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-11-28 04:38:00,182 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:00,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:00,269 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 04:38:00,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:00,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 79 states and 110 transitions. [2020-11-28 04:38:00,292 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 110 transitions. [2020-11-28 04:38:00,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-11-28 04:38:00,294 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:00,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:00,391 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 04:38:01,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:01,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 94 states and 142 transitions. [2020-11-28 04:38:01,523 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 142 transitions. [2020-11-28 04:38:01,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-11-28 04:38:01,527 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:01,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:01,610 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 04:38:01,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:01,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 95 states and 143 transitions. [2020-11-28 04:38:01,637 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 143 transitions. [2020-11-28 04:38:01,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-11-28 04:38:01,640 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:01,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:01,788 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 04:38:01,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:01,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 98 states and 151 transitions. [2020-11-28 04:38:01,968 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 151 transitions. [2020-11-28 04:38:01,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-11-28 04:38:01,971 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:02,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:02,076 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 04:38:02,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:02,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 104 states and 164 transitions. [2020-11-28 04:38:02,395 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 164 transitions. [2020-11-28 04:38:02,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-11-28 04:38:02,398 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:02,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:02,436 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 04:38:02,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:02,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 102 states and 158 transitions. [2020-11-28 04:38:02,454 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 158 transitions. [2020-11-28 04:38:02,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-11-28 04:38:02,456 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:02,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:02,493 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-28 04:38:02,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:02,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 107 states and 167 transitions. [2020-11-28 04:38:02,589 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 167 transitions. [2020-11-28 04:38:02,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-11-28 04:38:02,591 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:02,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:02,643 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-28 04:38:02,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:02,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 108 states and 168 transitions. [2020-11-28 04:38:02,665 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 168 transitions. [2020-11-28 04:38:02,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-11-28 04:38:02,667 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:02,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:02,942 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 04:38:03,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:03,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 111 states and 174 transitions. [2020-11-28 04:38:03,710 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 174 transitions. [2020-11-28 04:38:03,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-11-28 04:38:03,712 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:03,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:04,252 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 04:38:06,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:06,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 126 states and 211 transitions. [2020-11-28 04:38:06,638 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 211 transitions. [2020-11-28 04:38:06,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-11-28 04:38:06,640 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:06,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:06,676 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-28 04:38:07,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:07,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 129 states and 218 transitions. [2020-11-28 04:38:07,350 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 218 transitions. [2020-11-28 04:38:07,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-11-28 04:38:07,356 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:07,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:07,425 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-28 04:38:08,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:08,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 135 states and 236 transitions. [2020-11-28 04:38:08,764 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 236 transitions. [2020-11-28 04:38:08,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-11-28 04:38:08,768 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:08,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:08,825 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-28 04:38:10,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:10,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 147 states and 264 transitions. [2020-11-28 04:38:10,570 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 264 transitions. [2020-11-28 04:38:10,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-11-28 04:38:10,572 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:10,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:10,602 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-28 04:38:11,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:11,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 150 states and 270 transitions. [2020-11-28 04:38:11,251 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 270 transitions. [2020-11-28 04:38:11,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-11-28 04:38:11,253 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:11,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:11,294 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-11-28 04:38:11,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:11,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 151 states and 271 transitions. [2020-11-28 04:38:11,352 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 271 transitions. [2020-11-28 04:38:11,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-11-28 04:38:11,358 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:11,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:11,809 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 04:38:15,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:15,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 163 states and 294 transitions. [2020-11-28 04:38:15,128 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 294 transitions. [2020-11-28 04:38:15,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-11-28 04:38:15,130 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:15,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:15,163 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-28 04:38:15,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:15,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 163 states and 293 transitions. [2020-11-28 04:38:15,575 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 293 transitions. [2020-11-28 04:38:15,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-11-28 04:38:15,577 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:15,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:15,612 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 04:38:16,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:16,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 165 states and 293 transitions. [2020-11-28 04:38:16,183 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 293 transitions. [2020-11-28 04:38:16,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-11-28 04:38:16,185 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:16,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:16,254 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 04:38:16,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:16,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 166 states and 296 transitions. [2020-11-28 04:38:16,564 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 296 transitions. [2020-11-28 04:38:16,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-11-28 04:38:16,566 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:16,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:16,598 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-11-28 04:38:16,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:16,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 169 states and 301 transitions. [2020-11-28 04:38:16,830 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 301 transitions. [2020-11-28 04:38:16,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-11-28 04:38:16,832 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:16,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:16,883 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-11-28 04:38:16,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:16,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 170 states and 302 transitions. [2020-11-28 04:38:16,922 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 302 transitions. [2020-11-28 04:38:16,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-11-28 04:38:16,925 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:16,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:16,965 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-11-28 04:38:19,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:19,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 177 states and 311 transitions. [2020-11-28 04:38:19,008 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 311 transitions. [2020-11-28 04:38:19,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-11-28 04:38:19,009 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:19,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:19,061 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 24 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-28 04:38:19,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:19,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 178 states and 312 transitions. [2020-11-28 04:38:19,086 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 312 transitions. [2020-11-28 04:38:19,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-11-28 04:38:19,088 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:19,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:19,125 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 18 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-11-28 04:38:21,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:21,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 189 states and 337 transitions. [2020-11-28 04:38:21,103 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 337 transitions. [2020-11-28 04:38:21,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-11-28 04:38:21,105 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:21,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:21,140 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-11-28 04:38:21,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:21,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 190 states and 338 transitions. [2020-11-28 04:38:21,165 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 338 transitions. [2020-11-28 04:38:21,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-11-28 04:38:21,167 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:21,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:21,207 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 37 proven. 21 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-11-28 04:38:22,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:22,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 198 states and 357 transitions. [2020-11-28 04:38:22,598 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 357 transitions. [2020-11-28 04:38:22,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-11-28 04:38:22,600 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:22,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:22,645 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 39 proven. 31 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-11-28 04:38:22,834 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-11-28 04:38:23,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:23,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 202 states and 366 transitions. [2020-11-28 04:38:23,340 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 366 transitions. [2020-11-28 04:38:23,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-11-28 04:38:23,343 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:23,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:23,398 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 39 proven. 31 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-11-28 04:38:24,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:24,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 204 states and 370 transitions. [2020-11-28 04:38:24,192 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 370 transitions. [2020-11-28 04:38:24,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-11-28 04:38:24,194 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:24,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:24,238 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 39 proven. 34 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-11-28 04:38:24,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:24,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 205 states and 372 transitions. [2020-11-28 04:38:24,297 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 372 transitions. [2020-11-28 04:38:24,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-11-28 04:38:24,299 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:24,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:24,348 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 61 proven. 48 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-11-28 04:38:24,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:24,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 207 states and 376 transitions. [2020-11-28 04:38:24,950 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 376 transitions. [2020-11-28 04:38:24,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-11-28 04:38:24,953 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:24,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:25,026 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 68 proven. 57 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2020-11-28 04:38:25,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:25,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 442 states to 213 states and 385 transitions. [2020-11-28 04:38:25,109 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 385 transitions. [2020-11-28 04:38:25,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-11-28 04:38:25,112 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-11-28 04:38:25,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 04:38:25,180 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 69 proven. 57 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2020-11-28 04:38:25,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-11-28 04:38:25,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 443 states to 91 states and 123 transitions. [2020-11-28 04:38:25,219 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 123 transitions. [2020-11-28 04:38:25,219 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-28 04:38:25,220 WARN L425 CodeCheckObserver]: This Program is SAFE, Check terminated with 36 iterations. [2020-11-28 04:38:25,227 INFO L765 CodeCheckObserver]: All specifications hold 1 specifications checked. All of them hold [2020-11-28 04:38:25,697 INFO L569 CodeCheckObserver]: Invariant with dag size 1 [2020-11-28 04:38:25,701 INFO L569 CodeCheckObserver]: Invariant with dag size 1 [2020-11-28 04:38:25,701 INFO L569 CodeCheckObserver]: Invariant with dag size 1 [2020-11-28 04:38:25,701 INFO L569 CodeCheckObserver]: Invariant with dag size 1 [2020-11-28 04:38:25,702 INFO L569 CodeCheckObserver]: Invariant with dag size 9 [2020-11-28 04:38:25,706 INFO L569 CodeCheckObserver]: Invariant with dag size 1 [2020-11-28 04:38:25,706 INFO L569 CodeCheckObserver]: Invariant with dag size 7 [2020-11-28 04:38:25,707 INFO L569 CodeCheckObserver]: Invariant with dag size 1 [2020-11-28 04:38:25,707 INFO L569 CodeCheckObserver]: Invariant with dag size 3 [2020-11-28 04:38:25,709 INFO L569 CodeCheckObserver]: Invariant with dag size 1 [2020-11-28 04:38:25,709 INFO L569 CodeCheckObserver]: Invariant with dag size 1 [2020-11-28 04:38:25,709 INFO L569 CodeCheckObserver]: Invariant with dag size 11 [2020-11-28 04:38:25,711 INFO L569 CodeCheckObserver]: Invariant with dag size 1 [2020-11-28 04:38:25,712 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck CFG 28.11 04:38:25 ImpRootNode [2020-11-28 04:38:25,712 INFO L132 PluginConnector]: ------------------------ END CodeCheck---------------------------- [2020-11-28 04:38:25,713 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 04:38:25,713 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 04:38:25,713 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 04:38:25,714 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 04:37:58" (3/4) ... [2020-11-28 04:38:25,725 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-28 04:38:25,740 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure deactivatePump [2020-11-28 04:38:25,741 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure processEnvironment__wrappee__base [2020-11-28 04:38:25,741 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure changeMethaneLevel [2020-11-28 04:38:25,741 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure isMethaneLevelCritical [2020-11-28 04:38:25,741 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure timeShift [2020-11-28 04:38:25,741 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure cleanup [2020-11-28 04:38:25,742 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure waterRise [2020-11-28 04:38:25,742 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure processEnvironment__wrappee__methaneQuery [2020-11-28 04:38:25,742 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure isMethaneAlarm [2020-11-28 04:38:25,750 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 62 nodes and edges [2020-11-28 04:38:25,752 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 23 nodes and edges [2020-11-28 04:38:25,753 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2020-11-28 04:38:25,754 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2020-11-28 04:38:25,755 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-11-28 04:38:25,755 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-28 04:38:25,756 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-28 04:38:25,783 WARN L221 nessWitnessGenerator]: Not writing invariant because ACSL is forbidden: !(pumpRunning == 0) || pumpRunning == \old(pumpRunning) [2020-11-28 04:38:25,784 WARN L221 nessWitnessGenerator]: Not writing invariant because ACSL is forbidden: pumpRunning == \old(pumpRunning) [2020-11-28 04:38:25,855 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_397c55d1-647b-4367-b4e7-30eb4b2a2da4/bin/ukojak/witness.graphml [2020-11-28 04:38:25,855 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 04:38:25,856 INFO L168 Benchmark]: Toolchain (without parser) took 29315.15 ms. Allocated memory was 77.6 MB in the beginning and 446.7 MB in the end (delta: 369.1 MB). Free memory was 42.2 MB in the beginning and 246.4 MB in the end (delta: -204.2 MB). Peak memory consumption was 163.4 MB. Max. memory is 16.1 GB. [2020-11-28 04:38:25,857 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 77.6 MB. Free memory was 59.3 MB in the beginning and 59.3 MB in the end (delta: 77.2 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 04:38:25,857 INFO L168 Benchmark]: CACSL2BoogieTranslator took 662.62 ms. Allocated memory was 77.6 MB in the beginning and 100.7 MB in the end (delta: 23.1 MB). Free memory was 42.1 MB in the beginning and 63.7 MB in the end (delta: -21.6 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2020-11-28 04:38:25,858 INFO L168 Benchmark]: Boogie Procedure Inliner took 89.21 ms. Allocated memory is still 100.7 MB. Free memory was 63.7 MB in the beginning and 61.2 MB in the end (delta: 2.5 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-11-28 04:38:25,858 INFO L168 Benchmark]: Boogie Preprocessor took 58.24 ms. Allocated memory is still 100.7 MB. Free memory was 61.2 MB in the beginning and 59.1 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 04:38:25,859 INFO L168 Benchmark]: RCFGBuilder took 1546.67 ms. Allocated memory is still 100.7 MB. Free memory was 59.1 MB in the beginning and 70.8 MB in the end (delta: -11.7 MB). Peak memory consumption was 33.1 MB. Max. memory is 16.1 GB. [2020-11-28 04:38:25,859 INFO L168 Benchmark]: CodeCheck took 26796.92 ms. Allocated memory was 100.7 MB in the beginning and 446.7 MB in the end (delta: 346.0 MB). Free memory was 70.8 MB in the beginning and 251.7 MB in the end (delta: -180.9 MB). Peak memory consumption was 166.2 MB. Max. memory is 16.1 GB. [2020-11-28 04:38:25,860 INFO L168 Benchmark]: Witness Printer took 142.65 ms. Allocated memory is still 446.7 MB. Free memory was 251.7 MB in the beginning and 246.4 MB in the end (delta: 5.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-11-28 04:38:25,862 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck: - StatisticsResult: Ultimate CodeCheck benchmark data CFG has 10 procedures, 63 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 26.2s, OverallIterations: 36, TraceHistogramMax: 0, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1227981060 SDtfs, -1336933036 SDslu, 531160708 SDs, 0 SdLazy, 791094036 SolverSat, 380438420 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 43.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 19432 GetRequests, 19072 SyntacticMatches, 60 SemanticMatches, 300 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35941 ImplicationChecksByTransitivity, 20.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=-1occurred in iteration=-1, traceCheckStatistics: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 2.3s InterpolantComputationTime, 1843 NumberOfCodeBlocks, 1843 NumberOfCodeBlocksAsserted, 35 NumberOfCheckSat, 1808 ConstructedInterpolants, 0 QuantifiedInterpolants, 260783 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 35 InterpolantComputations, 16 PerfectInterpolantSequences, 883/1245 InterpolantCoveringCapability, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, ReuseStatistics: No data available - PositiveResult [Line: 3]: 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 - InvariantResult [Line: 932]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 894]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: -1]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 132]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 132]: Loop Invariant Derived loop invariant: (1 == systemActive && methaneLevelCritical == 0) && pumpRunning == 0 - InvariantResult [Line: 54]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 661]: Loop Invariant Derived loop invariant: !(pumpRunning == 0) || pumpRunning == \old(pumpRunning) - InvariantResult [Line: 669]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 694]: Loop Invariant Derived loop invariant: pumpRunning == \old(pumpRunning) - InvariantResult [Line: 44]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 893]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 866]: Loop Invariant Derived loop invariant: tmp == methaneLevelCritical || (!(tmp == 0) && !(pumpRunning == 0)) - InvariantResult [Line: 866]: Loop Invariant Derived loop invariant: 1 * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 77.6 MB. Free memory was 59.3 MB in the beginning and 59.3 MB in the end (delta: 77.2 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 662.62 ms. Allocated memory was 77.6 MB in the beginning and 100.7 MB in the end (delta: 23.1 MB). Free memory was 42.1 MB in the beginning and 63.7 MB in the end (delta: -21.6 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 89.21 ms. Allocated memory is still 100.7 MB. Free memory was 63.7 MB in the beginning and 61.2 MB in the end (delta: 2.5 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 58.24 ms. Allocated memory is still 100.7 MB. Free memory was 61.2 MB in the beginning and 59.1 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 1546.67 ms. Allocated memory is still 100.7 MB. Free memory was 59.1 MB in the beginning and 70.8 MB in the end (delta: -11.7 MB). Peak memory consumption was 33.1 MB. Max. memory is 16.1 GB. * CodeCheck took 26796.92 ms. Allocated memory was 100.7 MB in the beginning and 446.7 MB in the end (delta: 346.0 MB). Free memory was 70.8 MB in the beginning and 251.7 MB in the end (delta: -180.9 MB). Peak memory consumption was 166.2 MB. Max. memory is 16.1 GB. * Witness Printer took 142.65 ms. Allocated memory is still 446.7 MB. Free memory was 251.7 MB in the beginning and 246.4 MB in the end (delta: 5.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. RESULT: Ultimate proved your program to be correct! Received shutdown request...