./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/forester-heap/sll-buckets_false-unreach-call_false-valid-memcleanup.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 635dfa2a Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_aac3fef7-c7e3-4313-ad78-421bf2e3a0b8/bin-2019/ukojak/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_aac3fef7-c7e3-4313-ad78-421bf2e3a0b8/bin-2019/ukojak/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_aac3fef7-c7e3-4313-ad78-421bf2e3a0b8/bin-2019/ukojak/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_aac3fef7-c7e3-4313-ad78-421bf2e3a0b8/bin-2019/ukojak/config/KojakReach.xml -i ../../sv-benchmarks/c/forester-heap/sll-buckets_false-unreach-call_false-valid-memcleanup.i -s /tmp/vcloud-vcloud-master/worker/working_dir_aac3fef7-c7e3-4313-ad78-421bf2e3a0b8/bin-2019/ukojak/config/svcomp-Reach-32bit-Kojak_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_aac3fef7-c7e3-4313-ad78-421bf2e3a0b8/bin-2019/ukojak --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Kojak --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ec7b34841527490886cd362d78588ff0f0e72200 ...................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.23-635dfa2 [2018-12-09 11:18:26,115 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-09 11:18:26,116 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-09 11:18:26,124 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-09 11:18:26,124 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-09 11:18:26,125 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-09 11:18:26,125 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-09 11:18:26,126 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-09 11:18:26,128 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-09 11:18:26,128 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-09 11:18:26,129 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-09 11:18:26,129 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-09 11:18:26,130 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-09 11:18:26,130 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-09 11:18:26,131 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-09 11:18:26,132 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-09 11:18:26,132 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-09 11:18:26,134 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-09 11:18:26,135 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-09 11:18:26,136 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-09 11:18:26,137 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-09 11:18:26,138 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-09 11:18:26,139 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-09 11:18:26,139 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-09 11:18:26,140 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-09 11:18:26,140 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-09 11:18:26,141 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-09 11:18:26,141 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-09 11:18:26,142 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-09 11:18:26,143 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-09 11:18:26,143 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-09 11:18:26,143 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-09 11:18:26,143 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-09 11:18:26,143 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-09 11:18:26,144 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-09 11:18:26,144 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-09 11:18:26,144 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_aac3fef7-c7e3-4313-ad78-421bf2e3a0b8/bin-2019/ukojak/config/svcomp-Reach-32bit-Kojak_Default.epf [2018-12-09 11:18:26,151 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-09 11:18:26,151 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-09 11:18:26,151 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-09 11:18:26,152 INFO L133 SettingsManager]: * ... to procedures called more than once=ALWAYS [2018-12-09 11:18:26,152 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-09 11:18:26,152 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-09 11:18:26,152 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-09 11:18:26,152 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-09 11:18:26,152 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-09 11:18:26,152 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-09 11:18:26,152 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-09 11:18:26,152 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-09 11:18:26,153 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-09 11:18:26,153 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-09 11:18:26,153 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-09 11:18:26,153 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-09 11:18:26,153 INFO L133 SettingsManager]: * Use constant arrays=true [2018-12-09 11:18:26,153 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-09 11:18:26,153 INFO L131 SettingsManager]: Preferences of CodeCheck differ from their defaults: [2018-12-09 11:18:26,153 INFO L133 SettingsManager]: * Timeout in seconds=1000000 [2018-12-09 11:18:26,153 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-09 11:18:26,153 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-09 11:18:26,153 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2018-12-09 11:18:26,154 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-09 11:18:26,154 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-09 11:18:26,154 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-09 11:18:26,154 INFO L133 SettingsManager]: * Trace refinement strategy=PENGUIN [2018-12-09 11:18:26,154 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-09 11:18:26,154 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-09 11:18:26,154 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/working_dir_aac3fef7-c7e3-4313-ad78-421bf2e3a0b8/bin-2019/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(__VERIFIER_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 -> ec7b34841527490886cd362d78588ff0f0e72200 [2018-12-09 11:18:26,171 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-09 11:18:26,178 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-09 11:18:26,180 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-09 11:18:26,181 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-09 11:18:26,181 INFO L276 PluginConnector]: CDTParser initialized [2018-12-09 11:18:26,181 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_aac3fef7-c7e3-4313-ad78-421bf2e3a0b8/bin-2019/ukojak/../../sv-benchmarks/c/forester-heap/sll-buckets_false-unreach-call_false-valid-memcleanup.i [2018-12-09 11:18:26,216 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_aac3fef7-c7e3-4313-ad78-421bf2e3a0b8/bin-2019/ukojak/data/87c1ebee1/365b1fb7256a425b8f6bcb31913b3a7f/FLAGe8e27480e [2018-12-09 11:18:26,575 INFO L307 CDTParser]: Found 1 translation units. [2018-12-09 11:18:26,576 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_aac3fef7-c7e3-4313-ad78-421bf2e3a0b8/sv-benchmarks/c/forester-heap/sll-buckets_false-unreach-call_false-valid-memcleanup.i [2018-12-09 11:18:26,582 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_aac3fef7-c7e3-4313-ad78-421bf2e3a0b8/bin-2019/ukojak/data/87c1ebee1/365b1fb7256a425b8f6bcb31913b3a7f/FLAGe8e27480e [2018-12-09 11:18:26,591 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_aac3fef7-c7e3-4313-ad78-421bf2e3a0b8/bin-2019/ukojak/data/87c1ebee1/365b1fb7256a425b8f6bcb31913b3a7f [2018-12-09 11:18:26,593 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-09 11:18:26,594 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-09 11:18:26,594 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-09 11:18:26,594 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-09 11:18:26,596 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-09 11:18:26,597 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 11:18:26" (1/1) ... [2018-12-09 11:18:26,598 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4883fa57 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:18:26, skipping insertion in model container [2018-12-09 11:18:26,599 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 11:18:26" (1/1) ... [2018-12-09 11:18:26,603 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-09 11:18:26,623 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-09 11:18:26,769 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 11:18:26,814 INFO L191 MainTranslator]: Completed pre-run [2018-12-09 11:18:26,844 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 11:18:26,873 INFO L195 MainTranslator]: Completed translation [2018-12-09 11:18:26,873 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:18:26 WrapperNode [2018-12-09 11:18:26,873 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-09 11:18:26,873 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-09 11:18:26,873 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-09 11:18:26,874 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-09 11:18:26,878 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:18:26" (1/1) ... [2018-12-09 11:18:26,887 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:18:26" (1/1) ... [2018-12-09 11:18:26,900 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-09 11:18:26,901 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-09 11:18:26,901 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-09 11:18:26,901 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-09 11:18:26,907 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:18:26" (1/1) ... [2018-12-09 11:18:26,907 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:18:26" (1/1) ... [2018-12-09 11:18:26,909 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:18:26" (1/1) ... [2018-12-09 11:18:26,909 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:18:26" (1/1) ... [2018-12-09 11:18:26,914 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:18:26" (1/1) ... [2018-12-09 11:18:26,917 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:18:26" (1/1) ... [2018-12-09 11:18:26,918 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:18:26" (1/1) ... [2018-12-09 11:18:26,920 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-09 11:18:26,920 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-09 11:18:26,920 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-09 11:18:26,920 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-09 11:18:26,921 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:18:26" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_aac3fef7-c7e3-4313-ad78-421bf2e3a0b8/bin-2019/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 [2018-12-09 11:18:26,953 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-12-09 11:18:26,953 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-12-09 11:18:26,953 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-12-09 11:18:26,953 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-12-09 11:18:26,953 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-12-09 11:18:26,953 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-12-09 11:18:26,954 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-09 11:18:26,954 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-09 11:18:27,311 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-09 11:18:27,311 INFO L280 CfgBuilder]: Removed 19 assue(true) statements. [2018-12-09 11:18:27,311 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 11:18:27 BoogieIcfgContainer [2018-12-09 11:18:27,311 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-09 11:18:27,312 INFO L113 PluginConnector]: ------------------------CodeCheck---------------------------- [2018-12-09 11:18:27,312 INFO L271 PluginConnector]: Initializing CodeCheck... [2018-12-09 11:18:27,319 INFO L276 PluginConnector]: CodeCheck initialized [2018-12-09 11:18:27,320 INFO L185 PluginConnector]: Executing the observer CodeCheckObserver from plugin CodeCheck for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 11:18:27" (1/1) ... [2018-12-09 11:18:27,326 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 11:18:27,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:27,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 37 states and 60 transitions. [2018-12-09 11:18:27,347 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 60 transitions. [2018-12-09 11:18:27,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-09 11:18:27,349 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:27,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 11:18:27,468 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 11:18:27,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:27,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 40 states and 62 transitions. [2018-12-09 11:18:27,510 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 62 transitions. [2018-12-09 11:18:27,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-12-09 11:18:27,510 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:27,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 11:18:27,552 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 11:18:27,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:27,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 42 states and 62 transitions. [2018-12-09 11:18:27,609 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 62 transitions. [2018-12-09 11:18:27,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-09 11:18:27,609 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:27,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 11:18:27,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 11:18:27,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:27,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 40 states and 57 transitions. [2018-12-09 11:18:27,661 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 57 transitions. [2018-12-09 11:18:27,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-09 11:18:27,662 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:27,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 11:18:27,756 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 11:18:27,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:27,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 45 states and 66 transitions. [2018-12-09 11:18:27,893 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 66 transitions. [2018-12-09 11:18:27,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-09 11:18:27,895 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:27,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 11:18:27,907 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 11:18:27,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:27,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 45 states and 62 transitions. [2018-12-09 11:18:27,909 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 62 transitions. [2018-12-09 11:18:27,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-12-09 11:18:27,910 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:27,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 11:18:27,925 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 11:18:27,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:27,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 51 states and 72 transitions. [2018-12-09 11:18:27,967 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 72 transitions. [2018-12-09 11:18:27,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-09 11:18:27,967 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:27,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 11:18:28,038 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 11:18:28,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:28,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 59 states and 88 transitions. [2018-12-09 11:18:28,354 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 88 transitions. [2018-12-09 11:18:28,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-09 11:18:28,354 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:28,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 11:18:28,653 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 11:18:30,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:30,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 68 states and 107 transitions. [2018-12-09 11:18:30,000 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 107 transitions. [2018-12-09 11:18:30,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-12-09 11:18:30,001 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:30,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 11:18:30,112 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 11:18:31,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:31,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 76 states and 125 transitions. [2018-12-09 11:18:31,308 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 125 transitions. [2018-12-09 11:18:31,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-12-09 11:18:31,311 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:31,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 11:18:31,347 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-12-09 11:18:31,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:31,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 83 states and 139 transitions. [2018-12-09 11:18:31,821 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 139 transitions. [2018-12-09 11:18:31,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-12-09 11:18:31,822 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:31,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 11:18:32,580 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 11:18:32,779 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 59 [2018-12-09 11:18:36,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:36,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 95 states and 170 transitions. [2018-12-09 11:18:36,138 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 170 transitions. [2018-12-09 11:18:36,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-12-09 11:18:36,139 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:36,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 11:18:37,272 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 11:18:41,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:41,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 104 states and 193 transitions. [2018-12-09 11:18:41,083 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 193 transitions. [2018-12-09 11:18:41,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-12-09 11:18:41,084 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:41,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 11:18:41,093 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 11:18:41,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:41,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 104 states and 192 transitions. [2018-12-09 11:18:41,099 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 192 transitions. [2018-12-09 11:18:41,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-12-09 11:18:41,099 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:41,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 11:18:41,116 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-12-09 11:18:41,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:41,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 106 states and 196 transitions. [2018-12-09 11:18:41,774 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 196 transitions. [2018-12-09 11:18:41,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-09 11:18:41,774 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:41,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 11:18:41,790 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-12-09 11:18:41,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 11:18:41,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 109 states and 199 transitions. [2018-12-09 11:18:41,808 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 199 transitions. [2018-12-09 11:18:41,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-09 11:18:41,809 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 11:18:41,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-09 11:18:41,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-09 11:18:42,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-09 11:18:42,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-09 11:18:42,295 WARN L497 CodeCheckObserver]: This program is UNSAFE, Check terminated with 16 iterations. [2018-12-09 11:18:42,316 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck CFG 09.12 11:18:42 ImpRootNode [2018-12-09 11:18:42,316 INFO L132 PluginConnector]: ------------------------ END CodeCheck---------------------------- [2018-12-09 11:18:42,316 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-09 11:18:42,317 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-09 11:18:42,317 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-09 11:18:42,317 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 11:18:27" (3/4) ... [2018-12-09 11:18:42,318 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-12-09 11:18:42,354 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_aac3fef7-c7e3-4313-ad78-421bf2e3a0b8/bin-2019/ukojak/witness.graphml [2018-12-09 11:18:42,354 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-09 11:18:42,355 INFO L168 Benchmark]: Toolchain (without parser) took 15761.66 ms. Allocated memory was 1.0 GB in the beginning and 1.4 GB in the end (delta: 387.4 MB). Free memory was 956.0 MB in the beginning and 1.0 GB in the end (delta: -90.7 MB). Peak memory consumption was 296.8 MB. Max. memory is 11.5 GB. [2018-12-09 11:18:42,355 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 985.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 11:18:42,356 INFO L168 Benchmark]: CACSL2BoogieTranslator took 278.99 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 126.4 MB). Free memory was 956.0 MB in the beginning and 1.1 GB in the end (delta: -154.0 MB). Peak memory consumption was 27.4 MB. Max. memory is 11.5 GB. [2018-12-09 11:18:42,356 INFO L168 Benchmark]: Boogie Procedure Inliner took 27.00 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 11:18:42,356 INFO L168 Benchmark]: Boogie Preprocessor took 19.36 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 3.5 MB). Peak memory consumption was 3.5 MB. Max. memory is 11.5 GB. [2018-12-09 11:18:42,356 INFO L168 Benchmark]: RCFGBuilder took 391.40 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 50.3 MB). Peak memory consumption was 50.3 MB. Max. memory is 11.5 GB. [2018-12-09 11:18:42,357 INFO L168 Benchmark]: CodeCheck took 15004.45 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 261.1 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: -2.1 MB). Peak memory consumption was 258.9 MB. Max. memory is 11.5 GB. [2018-12-09 11:18:42,357 INFO L168 Benchmark]: Witness Printer took 37.95 ms. Allocated memory is still 1.4 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 11.7 MB). Peak memory consumption was 11.7 MB. Max. memory is 11.5 GB. [2018-12-09 11:18:42,359 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck: - StatisticsResult: Ultimate CodeCheck benchmark data CFG has 1 procedures, 44 locations, 5 error locations. UNSAFE Result, 14.9s OverallTime, 16 OverallIterations, 0 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 240544 SDtfs, 143368 SDslu, 196862 SDs, 0 SdLazy, 468930 SolverSat, 151796 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1950 GetRequests, 1747 SyntacticMatches, 17 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13920 ImplicationChecksByTransitivity, 13.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=-1occurred in iteration=-1, traceCheckStatistics: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 2.5s InterpolantComputationTime, 224 NumberOfCodeBlocks, 224 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 188 ConstructedInterpolants, 0 QuantifiedInterpolants, 48829 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 15 InterpolantComputations, 8 PerfectInterpolantSequences, 23/45 InterpolantCoveringCapability, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, ReuseStatistics: No data available - CounterExampleResult [Line: 1050]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L993] BCK* bucket = malloc(sizeof(BCK)); [L994] bucket->data = 0 [L995] bucket->list = ((void*)0) [L997] bucket->next = malloc(sizeof(BCK)) [L998] EXPR bucket->next [L998] BCK* bcki = bucket->next; [L999] bcki->data = 1 [L1000] bcki->list = ((void*)0) [L1002] bcki->next = malloc(sizeof(BCK)) [L1003] EXPR bcki->next [L1003] bcki = bcki->next [L1004] bcki->data = 2 [L1005] bcki->list = ((void*)0) [L1006] bcki->next = ((void*)0) [L1008] struct TSLL* item = ((void*)0); [L1009] struct TSLL* itr = ((void*)0); [L1010] COND TRUE __VERIFIER_nondet_int() [L1012] item = malloc(sizeof(SLL)) [L1013] item->next = ((void*)0) [L1014] COND TRUE __VERIFIER_nondet_int() [L1015] item->data = 0 [L1021] bcki = bucket [L1023] COND FALSE !(!(bcki != ((void*)0))) [L1024] COND FALSE !(!(item != ((void*)0))) [L1025] EXPR bcki->data [L1025] EXPR item->data [L1025] COND FALSE !(bcki->data != item->data) [L1027] COND FALSE !(!(bcki != ((void*)0))) [L1029] EXPR bcki->list [L1029] COND TRUE bcki->list == ((void*)0) [L1030] bcki->list = item [L1010] COND FALSE !(__VERIFIER_nondet_int()) [L1041] bcki = bucket [L1042] COND TRUE bcki != ((void*)0) [L1044] EXPR bcki->list [L1044] item = bcki->list [L1045] bcki->list = ((void*)0) [L1046] COND TRUE item != ((void*)0) [L1048] itr = item [L1049] EXPR item->next [L1049] item = item->next [L1050] EXPR itr->data [L1050] EXPR bcki->data [L1050] COND TRUE !(itr->data != bcki->data) [L1050] __VERIFIER_error() * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 985.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 278.99 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 126.4 MB). Free memory was 956.0 MB in the beginning and 1.1 GB in the end (delta: -154.0 MB). Peak memory consumption was 27.4 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 27.00 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 19.36 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 3.5 MB). Peak memory consumption was 3.5 MB. Max. memory is 11.5 GB. * RCFGBuilder took 391.40 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 50.3 MB). Peak memory consumption was 50.3 MB. Max. memory is 11.5 GB. * CodeCheck took 15004.45 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 261.1 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: -2.1 MB). Peak memory consumption was 258.9 MB. Max. memory is 11.5 GB. * Witness Printer took 37.95 ms. Allocated memory is still 1.4 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 11.7 MB). Peak memory consumption was 11.7 MB. Max. memory is 11.5 GB. RESULT: Ultimate proved your program to be incorrect! Received shutdown request...