./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench/sqrt1-ll.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 69874e26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/config/KojakReach.xml -i ../../sv-benchmarks/c/nla-digbench/sqrt1-ll.c -s /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/config/svcomp-Reach-32bit-Kojak_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/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 9ed748155954ba99e6e57d7fa3ec0dae8b69471a ............................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/config/KojakReach.xml -i ../../sv-benchmarks/c/nla-digbench/sqrt1-ll.c -s /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/config/svcomp-Reach-32bit-Kojak_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/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 9ed748155954ba99e6e57d7fa3ec0dae8b69471a .................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: ERROR: ExceptionOrErrorResult: SMTLIBException: Sort BitVec not declared --- Real Ultimate output --- This is Ultimate 0.2.0-69874e2 [2020-12-01 16:52:09,946 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-01 16:52:09,949 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-01 16:52:10,012 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-01 16:52:10,013 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-01 16:52:10,027 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-01 16:52:10,030 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-01 16:52:10,035 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-01 16:52:10,038 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-01 16:52:10,045 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-01 16:52:10,046 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-01 16:52:10,049 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-01 16:52:10,049 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-01 16:52:10,054 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-01 16:52:10,056 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-01 16:52:10,059 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-01 16:52:10,061 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-01 16:52:10,066 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-01 16:52:10,070 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-01 16:52:10,073 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-01 16:52:10,081 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-01 16:52:10,083 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-01 16:52:10,087 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-01 16:52:10,088 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-01 16:52:10,100 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-01 16:52:10,100 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-01 16:52:10,101 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-01 16:52:10,104 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-01 16:52:10,105 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-01 16:52:10,109 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-01 16:52:10,109 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-01 16:52:10,112 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-01 16:52:10,114 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-01 16:52:10,116 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-01 16:52:10,117 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-01 16:52:10,118 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-01 16:52:10,119 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-01 16:52:10,119 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-01 16:52:10,120 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-01 16:52:10,121 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-01 16:52:10,123 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-01 16:52:10,127 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/config/svcomp-Reach-32bit-Kojak_Default.epf [2020-12-01 16:52:10,171 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-01 16:52:10,172 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-01 16:52:10,173 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-01 16:52:10,173 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ALWAYS [2020-12-01 16:52:10,174 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-01 16:52:10,174 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-01 16:52:10,175 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-01 16:52:10,175 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-01 16:52:10,175 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-01 16:52:10,175 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-01 16:52:10,176 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-01 16:52:10,176 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-01 16:52:10,176 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-01 16:52:10,176 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-01 16:52:10,177 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-01 16:52:10,177 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-01 16:52:10,177 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-01 16:52:10,177 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-01 16:52:10,178 INFO L136 SettingsManager]: Preferences of CodeCheck differ from their defaults: [2020-12-01 16:52:10,178 INFO L138 SettingsManager]: * Timeout in seconds=1000000 [2020-12-01 16:52:10,178 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-01 16:52:10,178 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-12-01 16:52:10,179 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2020-12-01 16:52:10,179 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-01 16:52:10,179 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-01 16:52:10,180 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-01 16:52:10,180 INFO L138 SettingsManager]: * Trace refinement strategy=PENGUIN [2020-12-01 16:52:10,180 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-01 16:52:10,180 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-01 16:52:10,181 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_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Kojak Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9ed748155954ba99e6e57d7fa3ec0dae8b69471a [2020-12-01 16:52:10,446 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-01 16:52:10,479 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-01 16:52:10,481 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-01 16:52:10,483 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-01 16:52:10,485 INFO L275 PluginConnector]: CDTParser initialized [2020-12-01 16:52:10,487 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/../../sv-benchmarks/c/nla-digbench/sqrt1-ll.c [2020-12-01 16:52:10,592 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/data/38921c9d2/295fd5251bbe4d85ad9caca4b757ebb1/FLAG328d79533 [2020-12-01 16:52:11,156 INFO L306 CDTParser]: Found 1 translation units. [2020-12-01 16:52:11,157 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/sv-benchmarks/c/nla-digbench/sqrt1-ll.c [2020-12-01 16:52:11,172 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/data/38921c9d2/295fd5251bbe4d85ad9caca4b757ebb1/FLAG328d79533 [2020-12-01 16:52:11,488 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/data/38921c9d2/295fd5251bbe4d85ad9caca4b757ebb1 [2020-12-01 16:52:11,492 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-01 16:52:11,494 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-01 16:52:11,496 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-01 16:52:11,496 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-01 16:52:11,503 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-01 16:52:11,505 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.12 04:52:11" (1/1) ... [2020-12-01 16:52:11,509 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4726d8a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:11, skipping insertion in model container [2020-12-01 16:52:11,509 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.12 04:52:11" (1/1) ... [2020-12-01 16:52:11,518 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-01 16:52:11,545 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-01 16:52:11,776 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-01 16:52:11,794 INFO L203 MainTranslator]: Completed pre-run [2020-12-01 16:52:11,849 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-01 16:52:11,870 INFO L208 MainTranslator]: Completed translation [2020-12-01 16:52:11,872 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:11 WrapperNode [2020-12-01 16:52:11,873 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-01 16:52:11,877 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-01 16:52:11,877 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-01 16:52:11,877 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-01 16:52:11,890 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:11" (1/1) ... [2020-12-01 16:52:11,899 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:11" (1/1) ... [2020-12-01 16:52:11,916 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-01 16:52:11,920 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-01 16:52:11,920 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-01 16:52:11,920 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-01 16:52:11,927 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:11" (1/1) ... [2020-12-01 16:52:11,927 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:11" (1/1) ... [2020-12-01 16:52:11,929 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:11" (1/1) ... [2020-12-01 16:52:11,929 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:11" (1/1) ... [2020-12-01 16:52:11,932 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:11" (1/1) ... [2020-12-01 16:52:11,936 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:11" (1/1) ... [2020-12-01 16:52:11,938 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:11" (1/1) ... [2020-12-01 16:52:11,939 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-01 16:52:11,940 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-01 16:52:11,940 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-01 16:52:11,941 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-01 16:52:11,942 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:11" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/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 [2020-12-01 16:52:12,028 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-01 16:52:12,028 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-01 16:52:12,028 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-01 16:52:12,029 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-01 16:52:12,029 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-12-01 16:52:12,029 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-12-01 16:52:12,337 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-01 16:52:12,337 INFO L298 CfgBuilder]: Removed 7 assume(true) statements. [2020-12-01 16:52:12,340 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.12 04:52:12 BoogieIcfgContainer [2020-12-01 16:52:12,340 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-01 16:52:12,356 INFO L113 PluginConnector]: ------------------------CodeCheck---------------------------- [2020-12-01 16:52:12,356 INFO L271 PluginConnector]: Initializing CodeCheck... [2020-12-01 16:52:12,369 INFO L275 PluginConnector]: CodeCheck initialized [2020-12-01 16:52:12,370 INFO L185 PluginConnector]: Executing the observer CodeCheckObserver from plugin CodeCheck for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.12 04:52:12" (1/1) ... [2020-12-01 16:52:12,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 16:52:12,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-12-01 16:52:12,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 17 states and 24 transitions. [2020-12-01 16:52:12,485 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 24 transitions. [2020-12-01 16:52:12,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-01 16:52:12,487 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-12-01 16:52:12,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 16:52:12,661 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 16:52:12,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-12-01 16:52:12,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 17 states and 22 transitions. [2020-12-01 16:52:12,682 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 22 transitions. [2020-12-01 16:52:12,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-01 16:52:12,683 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-12-01 16:52:12,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 16:52:12,851 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 16:52:12,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-12-01 16:52:12,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 21 states and 33 transitions. [2020-12-01 16:52:12,971 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 33 transitions. [2020-12-01 16:52:12,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-01 16:52:12,976 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-12-01 16:52:13,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 16:52:13,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-01 16:52:13,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 16:52:13,290 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 16:52:13,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-12-01 16:52:13,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 24 states and 39 transitions. [2020-12-01 16:52:13,698 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 39 transitions. [2020-12-01 16:52:13,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-01 16:52:13,701 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-12-01 16:52:13,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 16:52:13,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-01 16:52:13,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 16:52:13,854 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-01 16:52:14,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-12-01 16:52:14,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 25 states and 42 transitions. [2020-12-01 16:52:14,024 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 42 transitions. [2020-12-01 16:52:14,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-01 16:52:14,027 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-12-01 16:52:14,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 16:52:14,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-01 16:52:14,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 16:52:14,189 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-01 16:52:14,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-12-01 16:52:14,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 28 states and 47 transitions. [2020-12-01 16:52:14,353 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 47 transitions. [2020-12-01 16:52:14,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-01 16:52:14,356 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-12-01 16:52:14,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 16:52:14,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-01 16:52:14,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 16:52:14,519 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-01 16:52:14,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-12-01 16:52:14,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 31 states and 52 transitions. [2020-12-01 16:52:14,854 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 52 transitions. [2020-12-01 16:52:14,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-01 16:52:14,856 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-12-01 16:52:14,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 16:52:14,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-01 16:52:14,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 16:52:15,056 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-01 16:52:15,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-12-01 16:52:15,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 33 states and 55 transitions. [2020-12-01 16:52:15,376 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 55 transitions. [2020-12-01 16:52:15,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-01 16:52:15,378 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-12-01 16:52:15,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 16:52:15,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 23 conjunts are in the unsatisfiable core [2020-12-01 16:52:15,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 16:52:15,593 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 16 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-01 16:52:15,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-12-01 16:52:15,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 34 states and 57 transitions. [2020-12-01 16:52:15,963 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 57 transitions. [2020-12-01 16:52:15,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-12-01 16:52:15,974 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-12-01 16:52:16,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 16:52:16,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-01 16:52:16,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 16:52:36,141 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck has thrown an exception: java.lang.NullPointerException at de.uni_freiburg.informatik.ultimate.util.statistics.StatisticsData.aggregateBenchmarkData(StatisticsData.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopStatisticsGenerator.addTraceCheckData(CegarLoopStatisticsGenerator.java:79) at de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck.CodeCheckObserver.process(CodeCheckObserver.java:460) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.CFGWalker.runObserver(CFGWalker.java:57) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-01 16:52:36,146 INFO L168 Benchmark]: Toolchain (without parser) took 24651.11 ms. Allocated memory was 92.3 MB in the beginning and 146.8 MB in the end (delta: 54.5 MB). Free memory was 61.8 MB in the beginning and 103.1 MB in the end (delta: -41.3 MB). Peak memory consumption was 14.0 MB. Max. memory is 16.1 GB. [2020-12-01 16:52:36,147 INFO L168 Benchmark]: CDTParser took 0.33 ms. Allocated memory is still 71.3 MB. Free memory was 33.6 MB in the beginning and 33.5 MB in the end (delta: 33.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-01 16:52:36,148 INFO L168 Benchmark]: CACSL2BoogieTranslator took 377.54 ms. Allocated memory is still 92.3 MB. Free memory was 61.6 MB in the beginning and 69.4 MB in the end (delta: -7.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-01 16:52:36,149 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.88 ms. Allocated memory is still 92.3 MB. Free memory was 69.4 MB in the beginning and 67.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-01 16:52:36,150 INFO L168 Benchmark]: Boogie Preprocessor took 19.59 ms. Allocated memory is still 92.3 MB. Free memory was 67.8 MB in the beginning and 66.9 MB in the end (delta: 946.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-01 16:52:36,151 INFO L168 Benchmark]: RCFGBuilder took 399.86 ms. Allocated memory is still 92.3 MB. Free memory was 66.9 MB in the beginning and 53.1 MB in the end (delta: 13.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2020-12-01 16:52:36,152 INFO L168 Benchmark]: CodeCheck took 23787.87 ms. Allocated memory was 92.3 MB in the beginning and 146.8 MB in the end (delta: 54.5 MB). Free memory was 53.1 MB in the beginning and 103.1 MB in the end (delta: -50.0 MB). Peak memory consumption was 6.5 MB. Max. memory is 16.1 GB. [2020-12-01 16:52:36,158 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck: - ExceptionOrErrorResult: NullPointerException: null de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck: NullPointerException: null: de.uni_freiburg.informatik.ultimate.util.statistics.StatisticsData.aggregateBenchmarkData(StatisticsData.java:68) * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33 ms. Allocated memory is still 71.3 MB. Free memory was 33.6 MB in the beginning and 33.5 MB in the end (delta: 33.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 377.54 ms. Allocated memory is still 92.3 MB. Free memory was 61.6 MB in the beginning and 69.4 MB in the end (delta: -7.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 39.88 ms. Allocated memory is still 92.3 MB. Free memory was 69.4 MB in the beginning and 67.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 19.59 ms. Allocated memory is still 92.3 MB. Free memory was 67.8 MB in the beginning and 66.9 MB in the end (delta: 946.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 399.86 ms. Allocated memory is still 92.3 MB. Free memory was 66.9 MB in the beginning and 53.1 MB in the end (delta: 13.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * CodeCheck took 23787.87 ms. Allocated memory was 92.3 MB in the beginning and 146.8 MB in the end (delta: 54.5 MB). Free memory was 53.1 MB in the beginning and 103.1 MB in the end (delta: -50.0 MB). Peak memory consumption was 6.5 MB. Max. memory is 16.1 GB. RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... ### Bit-precise run ### This is Ultimate 0.2.0-69874e2 [2020-12-01 16:52:38,994 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-01 16:52:38,999 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-01 16:52:39,045 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-01 16:52:39,046 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-01 16:52:39,048 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-01 16:52:39,050 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-01 16:52:39,053 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-01 16:52:39,056 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-01 16:52:39,058 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-01 16:52:39,059 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-01 16:52:39,067 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-01 16:52:39,068 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-01 16:52:39,069 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-01 16:52:39,071 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-01 16:52:39,072 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-01 16:52:39,074 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-01 16:52:39,075 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-01 16:52:39,078 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-01 16:52:39,080 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-01 16:52:39,083 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-01 16:52:39,085 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-01 16:52:39,087 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-01 16:52:39,088 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-01 16:52:39,092 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-01 16:52:39,092 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-01 16:52:39,093 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-01 16:52:39,094 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-01 16:52:39,095 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-01 16:52:39,096 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-01 16:52:39,097 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-01 16:52:39,098 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-01 16:52:39,099 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-01 16:52:39,100 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-01 16:52:39,102 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-01 16:52:39,103 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-01 16:52:39,104 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-01 16:52:39,104 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-01 16:52:39,105 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-01 16:52:39,106 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-01 16:52:39,107 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-01 16:52:39,109 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/config/svcomp-Reach-32bit-Kojak_Bitvector.epf [2020-12-01 16:52:39,136 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-01 16:52:39,137 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-01 16:52:39,138 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-01 16:52:39,139 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ALWAYS [2020-12-01 16:52:39,139 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-01 16:52:39,140 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-01 16:52:39,140 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-01 16:52:39,140 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-01 16:52:39,141 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-01 16:52:39,141 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-01 16:52:39,141 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-01 16:52:39,142 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-01 16:52:39,142 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-01 16:52:39,142 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-01 16:52:39,142 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2020-12-01 16:52:39,143 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2020-12-01 16:52:39,143 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-01 16:52:39,143 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-01 16:52:39,143 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-01 16:52:39,144 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-01 16:52:39,144 INFO L136 SettingsManager]: Preferences of CodeCheck differ from their defaults: [2020-12-01 16:52:39,144 INFO L138 SettingsManager]: * Timeout in seconds=1000000 [2020-12-01 16:52:39,145 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-01 16:52:39,145 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-12-01 16:52:39,145 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2020-12-01 16:52:39,145 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-01 16:52:39,146 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-01 16:52:39,146 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-01 16:52:39,146 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2020-12-01 16:52:39,146 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --rewrite-divk --print-success --lang smt [2020-12-01 16:52:39,147 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-01 16:52:39,147 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-12-01 16:52:39,147 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-01 16:52:39,147 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Kojak Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9ed748155954ba99e6e57d7fa3ec0dae8b69471a [2020-12-01 16:52:39,640 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-01 16:52:39,682 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-01 16:52:39,684 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-01 16:52:39,686 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-01 16:52:39,692 INFO L275 PluginConnector]: CDTParser initialized [2020-12-01 16:52:39,693 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/../../sv-benchmarks/c/nla-digbench/sqrt1-ll.c [2020-12-01 16:52:39,765 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/data/9106e69c8/c7743f81e3724bff82ae1a04ed83aab2/FLAG16cc70d07 [2020-12-01 16:52:40,342 INFO L306 CDTParser]: Found 1 translation units. [2020-12-01 16:52:40,344 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/sv-benchmarks/c/nla-digbench/sqrt1-ll.c [2020-12-01 16:52:40,352 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/data/9106e69c8/c7743f81e3724bff82ae1a04ed83aab2/FLAG16cc70d07 [2020-12-01 16:52:40,695 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/bin/ukojak/data/9106e69c8/c7743f81e3724bff82ae1a04ed83aab2 [2020-12-01 16:52:40,698 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-01 16:52:40,701 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-01 16:52:40,704 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-01 16:52:40,704 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-01 16:52:40,709 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-01 16:52:40,711 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.12 04:52:40" (1/1) ... [2020-12-01 16:52:40,725 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7fbe7103 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:40, skipping insertion in model container [2020-12-01 16:52:40,725 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.12 04:52:40" (1/1) ... [2020-12-01 16:52:40,734 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-01 16:52:40,756 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-01 16:52:40,944 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-01 16:52:40,964 INFO L203 MainTranslator]: Completed pre-run [2020-12-01 16:52:41,038 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-01 16:52:41,070 INFO L208 MainTranslator]: Completed translation [2020-12-01 16:52:41,070 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:41 WrapperNode [2020-12-01 16:52:41,071 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-01 16:52:41,073 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-01 16:52:41,073 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-01 16:52:41,073 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-01 16:52:41,082 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:41" (1/1) ... [2020-12-01 16:52:41,092 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:41" (1/1) ... [2020-12-01 16:52:41,113 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-01 16:52:41,114 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-01 16:52:41,115 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-01 16:52:41,115 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-01 16:52:41,125 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:41" (1/1) ... [2020-12-01 16:52:41,125 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:41" (1/1) ... [2020-12-01 16:52:41,128 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:41" (1/1) ... [2020-12-01 16:52:41,128 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:41" (1/1) ... [2020-12-01 16:52:41,134 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:41" (1/1) ... [2020-12-01 16:52:41,139 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:41" (1/1) ... [2020-12-01 16:52:41,141 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:41" (1/1) ... [2020-12-01 16:52:41,143 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-01 16:52:41,144 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-01 16:52:41,145 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-01 16:52:41,145 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-01 16:52:41,146 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 04:52:41" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_c049fcc6-3ac1-41f1-b601-bd26ccc626c3/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 [2020-12-01 16:52:41,254 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2020-12-01 16:52:41,254 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-01 16:52:41,254 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-01 16:52:41,255 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-01 16:52:41,255 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-12-01 16:52:41,256 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-12-01 16:52:41,713 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-01 16:52:41,714 INFO L298 CfgBuilder]: Removed 7 assume(true) statements. [2020-12-01 16:52:41,716 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.12 04:52:41 BoogieIcfgContainer [2020-12-01 16:52:41,724 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-01 16:52:41,725 INFO L113 PluginConnector]: ------------------------CodeCheck---------------------------- [2020-12-01 16:52:41,725 INFO L271 PluginConnector]: Initializing CodeCheck... [2020-12-01 16:52:41,746 INFO L275 PluginConnector]: CodeCheck initialized [2020-12-01 16:52:41,746 INFO L185 PluginConnector]: Executing the observer CodeCheckObserver from plugin CodeCheck for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.12 04:52:41" (1/1) ... [2020-12-01 16:52:41,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 16:52:41,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2020-12-01 16:52:41,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 17 states and 24 transitions. [2020-12-01 16:52:41,832 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 24 transitions. [2020-12-01 16:52:41,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-01 16:52:41,834 INFO L428 CodeCheckObserver]: Error Path is FOUND. [2020-12-01 16:52:41,875 FATAL L? ?]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: Sort BitVec not declared at de.uni_freiburg.informatik.ultimate.logic.NoopScript.sort(NoopScript.java:419) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.sort(WrapperScript.java:228) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.sort(WrapperScript.java:228) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.scripttransfer.NonDeclaringTermTransferrer.transferSort(NonDeclaringTermTransferrer.java:111) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.scripttransfer.DeclarableSortSymbol.defineOrDeclare(DeclarableSortSymbol.java:79) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.scripttransfer.HistoryRecordingScript.transferHistoryFromRecord(HistoryRecordingScript.java:171) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.scripttransfer.HistoryRecordingScript.transferHistoryFromRecord(HistoryRecordingScript.java:196) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.SmtFunctionsAndAxioms.transferAllSymbols(SmtFunctionsAndAxioms.java:141) at de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck.CodeCheckObserver.process(CodeCheckObserver.java:448) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.CFGWalker.runObserver(CFGWalker.java:57) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-01 16:52:41,887 INFO L168 Benchmark]: Toolchain (without parser) took 1183.72 ms. Allocated memory was 52.4 MB in the beginning and 62.9 MB in the end (delta: 10.5 MB). Free memory was 29.5 MB in the beginning and 41.2 MB in the end (delta: -11.7 MB). Peak memory consumption was 133.9 kB. Max. memory is 16.1 GB. [2020-12-01 16:52:41,889 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 52.4 MB. Free memory was 34.7 MB in the beginning and 34.6 MB in the end (delta: 25.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-01 16:52:41,893 INFO L168 Benchmark]: CACSL2BoogieTranslator took 367.45 ms. Allocated memory was 52.4 MB in the beginning and 62.9 MB in the end (delta: 10.5 MB). Free memory was 29.3 MB in the beginning and 45.5 MB in the end (delta: -16.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-12-01 16:52:41,894 INFO L168 Benchmark]: Boogie Procedure Inliner took 40.77 ms. Allocated memory is still 62.9 MB. Free memory was 45.3 MB in the beginning and 44.0 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-01 16:52:41,896 INFO L168 Benchmark]: Boogie Preprocessor took 29.10 ms. Allocated memory is still 62.9 MB. Free memory was 44.0 MB in the beginning and 42.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-01 16:52:41,897 INFO L168 Benchmark]: RCFGBuilder took 579.73 ms. Allocated memory is still 62.9 MB. Free memory was 42.7 MB in the beginning and 28.5 MB in the end (delta: 14.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-12-01 16:52:41,897 INFO L168 Benchmark]: CodeCheck took 158.70 ms. Allocated memory is still 62.9 MB. Free memory was 28.3 MB in the beginning and 41.2 MB in the end (delta: -12.9 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-01 16:52:41,909 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck: - ExceptionOrErrorResult: SMTLIBException: Sort BitVec not declared de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck: SMTLIBException: Sort BitVec not declared: de.uni_freiburg.informatik.ultimate.logic.NoopScript.sort(NoopScript.java:419) * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 52.4 MB. Free memory was 34.7 MB in the beginning and 34.6 MB in the end (delta: 25.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 367.45 ms. Allocated memory was 52.4 MB in the beginning and 62.9 MB in the end (delta: 10.5 MB). Free memory was 29.3 MB in the beginning and 45.5 MB in the end (delta: -16.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 40.77 ms. Allocated memory is still 62.9 MB. Free memory was 45.3 MB in the beginning and 44.0 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 29.10 ms. Allocated memory is still 62.9 MB. Free memory was 44.0 MB in the beginning and 42.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 579.73 ms. Allocated memory is still 62.9 MB. Free memory was 42.7 MB in the beginning and 28.5 MB in the end (delta: 14.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * CodeCheck took 158.70 ms. Allocated memory is still 62.9 MB. Free memory was 28.3 MB in the beginning and 41.2 MB in the end (delta: -12.9 MB). There was no memory consumed. Max. memory is 16.1 GB. RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...