/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCInlineTransformed.xml -s ../../../trunk/examples/settings/automizer/BvToInt/svcomp-Reach-64bit-Automizer_BvToInt_SUM.epf -i ../../../trunk/examples/svcomp/ldv-regression/nested_structure_noptr-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-a10ec3b [2022-01-11 05:19:58,314 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-11 05:19:58,316 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-11 05:19:58,360 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-01-11 05:19:58,360 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-01-11 05:19:58,369 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-01-11 05:19:58,371 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-01-11 05:19:58,387 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-01-11 05:19:58,388 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-01-11 05:19:58,389 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-01-11 05:19:58,390 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-01-11 05:19:58,390 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-01-11 05:19:58,391 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-01-11 05:19:58,391 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-01-11 05:19:58,392 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-01-11 05:19:58,392 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-01-11 05:19:58,393 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-01-11 05:19:58,393 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-01-11 05:19:58,394 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-01-11 05:19:58,395 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-01-11 05:19:58,396 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-01-11 05:19:58,397 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-01-11 05:19:58,398 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-01-11 05:19:58,398 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-01-11 05:19:58,399 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-01-11 05:19:58,400 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-01-11 05:19:58,400 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-01-11 05:19:58,400 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-01-11 05:19:58,401 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-01-11 05:19:58,401 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-01-11 05:19:58,401 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-01-11 05:19:58,402 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-01-11 05:19:58,402 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-01-11 05:19:58,403 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-01-11 05:19:58,403 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-01-11 05:19:58,403 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-01-11 05:19:58,404 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-01-11 05:19:58,404 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-01-11 05:19:58,404 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-11 05:19:58,404 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-11 05:19:58,405 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-11 05:19:58,408 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/BvToInt/svcomp-Reach-64bit-Automizer_BvToInt_SUM.epf [2022-01-11 05:19:58,432 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-11 05:19:58,432 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-11 05:19:58,433 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-01-11 05:19:58,433 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-01-11 05:19:58,434 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-01-11 05:19:58,434 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-01-11 05:19:58,434 INFO L138 SettingsManager]: * Use SBE=true [2022-01-11 05:19:58,434 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-11 05:19:58,434 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-11 05:19:58,434 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-11 05:19:58,435 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-11 05:19:58,435 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-11 05:19:58,435 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-11 05:19:58,435 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-01-11 05:19:58,435 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-01-11 05:19:58,435 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-01-11 05:19:58,435 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-11 05:19:58,435 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-11 05:19:58,435 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-11 05:19:58,436 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-11 05:19:58,436 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-11 05:19:58,436 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-11 05:19:58,436 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-11 05:19:58,436 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-01-11 05:19:58,436 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-01-11 05:19:58,436 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-01-11 05:19:58,436 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-01-11 05:19:58,436 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-01-11 05:19:58,436 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-01-11 05:19:58,436 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-01-11 05:19:58,436 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-01-11 05:19:58,437 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-01-11 05:19:58,437 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-01-11 05:19:58,437 INFO L138 SettingsManager]: * TransformationType=BV_TO_INT_SUM WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-11 05:19:58,607 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-11 05:19:58,624 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-11 05:19:58,625 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-11 05:19:58,626 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-11 05:19:58,627 INFO L275 PluginConnector]: CDTParser initialized [2022-01-11 05:19:58,627 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/nested_structure_noptr-2.i [2022-01-11 05:19:58,687 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1e437352a/110d762925c047d784d71da58c00aa70/FLAGf80d31aa0 [2022-01-11 05:19:59,067 INFO L306 CDTParser]: Found 1 translation units. [2022-01-11 05:19:59,068 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/nested_structure_noptr-2.i [2022-01-11 05:19:59,075 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1e437352a/110d762925c047d784d71da58c00aa70/FLAGf80d31aa0 [2022-01-11 05:19:59,088 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1e437352a/110d762925c047d784d71da58c00aa70 [2022-01-11 05:19:59,090 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-11 05:19:59,092 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-01-11 05:19:59,094 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-11 05:19:59,094 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-11 05:19:59,096 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-11 05:19:59,097 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.01 05:19:59" (1/1) ... [2022-01-11 05:19:59,098 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@284d99a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 05:19:59, skipping insertion in model container [2022-01-11 05:19:59,098 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.01 05:19:59" (1/1) ... [2022-01-11 05:19:59,103 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-11 05:19:59,112 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-11 05:19:59,232 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/nested_structure_noptr-2.i[310,323] [2022-01-11 05:19:59,243 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-11 05:19:59,250 INFO L203 MainTranslator]: Completed pre-run [2022-01-11 05:19:59,258 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/nested_structure_noptr-2.i[310,323] [2022-01-11 05:19:59,263 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-11 05:19:59,275 INFO L208 MainTranslator]: Completed translation [2022-01-11 05:19:59,275 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 05:19:59 WrapperNode [2022-01-11 05:19:59,276 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-11 05:19:59,276 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-01-11 05:19:59,277 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-01-11 05:19:59,277 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-01-11 05:19:59,281 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 05:19:59" (1/1) ... [2022-01-11 05:19:59,288 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 05:19:59" (1/1) ... [2022-01-11 05:19:59,301 INFO L137 Inliner]: procedures = 16, calls = 16, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 28 [2022-01-11 05:19:59,301 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-01-11 05:19:59,302 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-11 05:19:59,302 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-11 05:19:59,302 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-11 05:19:59,307 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 05:19:59" (1/1) ... [2022-01-11 05:19:59,307 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 05:19:59" (1/1) ... [2022-01-11 05:19:59,319 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 05:19:59" (1/1) ... [2022-01-11 05:19:59,319 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 05:19:59" (1/1) ... [2022-01-11 05:19:59,329 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 05:19:59" (1/1) ... [2022-01-11 05:19:59,330 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 05:19:59" (1/1) ... [2022-01-11 05:19:59,331 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 05:19:59" (1/1) ... [2022-01-11 05:19:59,332 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-11 05:19:59,332 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-11 05:19:59,332 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-11 05:19:59,332 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-11 05:19:59,337 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 05:19:59" (1/1) ... [2022-01-11 05:19:59,342 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-11 05:19:59,349 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-11 05:19:59,359 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-01-11 05:19:59,364 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-01-11 05:19:59,386 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-11 05:19:59,386 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-01-11 05:19:59,387 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE4 [2022-01-11 05:19:59,387 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-01-11 05:19:59,387 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2022-01-11 05:19:59,387 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-11 05:19:59,387 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-11 05:19:59,387 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-01-11 05:19:59,387 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2022-01-11 05:19:59,429 INFO L234 CfgBuilder]: Building ICFG [2022-01-11 05:19:59,430 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-11 05:19:59,499 INFO L275 CfgBuilder]: Performing block encoding [2022-01-11 05:19:59,503 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-11 05:19:59,503 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2022-01-11 05:19:59,504 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.01 05:19:59 BoogieIcfgContainer [2022-01-11 05:19:59,504 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-11 05:19:59,505 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-01-11 05:19:59,505 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-01-11 05:19:59,506 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-01-11 05:19:59,507 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.01 05:19:59" (1/1) ... [2022-01-11 05:19:59,573 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 11.01 05:19:59 BasicIcfg [2022-01-11 05:19:59,573 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-01-11 05:19:59,574 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-11 05:19:59,574 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-11 05:19:59,576 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-11 05:19:59,576 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 11.01 05:19:59" (1/4) ... [2022-01-11 05:19:59,576 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a1dc8ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.01 05:19:59, skipping insertion in model container [2022-01-11 05:19:59,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 05:19:59" (2/4) ... [2022-01-11 05:19:59,577 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a1dc8ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.01 05:19:59, skipping insertion in model container [2022-01-11 05:19:59,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.01 05:19:59" (3/4) ... [2022-01-11 05:19:59,577 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a1dc8ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 11.01 05:19:59, skipping insertion in model container [2022-01-11 05:19:59,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 11.01 05:19:59" (4/4) ... [2022-01-11 05:19:59,578 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_structure_noptr-2.iTransformedIcfg [2022-01-11 05:19:59,598 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-01-11 05:19:59,598 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-11 05:19:59,643 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-11 05:19:59,660 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2022-01-11 05:19:59,661 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-11 05:19:59,673 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.25) internal successors, (10), 9 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-11 05:19:59,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-01-11 05:19:59,676 INFO L506 BasicCegarLoop]: Found error trace [2022-01-11 05:19:59,676 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2022-01-11 05:19:59,677 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-11 05:19:59,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-11 05:19:59,682 INFO L85 PathProgramCache]: Analyzing trace with hash 1478692, now seen corresponding path program 1 times [2022-01-11 05:19:59,688 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-11 05:19:59,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1414691268] [2022-01-11 05:19:59,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-11 05:19:59,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-11 05:19:59,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-11 05:19:59,885 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-11 05:19:59,886 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-11 05:19:59,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1414691268] [2022-01-11 05:19:59,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1414691268] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-11 05:19:59,887 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-11 05:19:59,887 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-11 05:19:59,890 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236740431] [2022-01-11 05:19:59,890 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-11 05:19:59,893 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-11 05:19:59,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-11 05:19:59,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-11 05:19:59,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-11 05:19:59,918 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.25) internal successors, (10), 9 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-11 05:19:59,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-11 05:19:59,942 INFO L93 Difference]: Finished difference Result 14 states and 13 transitions. [2022-01-11 05:19:59,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-11 05:19:59,944 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-01-11 05:19:59,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-11 05:19:59,947 INFO L225 Difference]: With dead ends: 14 [2022-01-11 05:19:59,948 INFO L226 Difference]: Without dead ends: 0 [2022-01-11 05:19:59,949 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-11 05:19:59,953 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 1 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-11 05:19:59,955 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 8 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-11 05:19:59,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-01-11 05:19:59,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-01-11 05:19:59,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-11 05:19:59,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-01-11 05:19:59,972 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 4 [2022-01-11 05:19:59,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-11 05:19:59,973 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-01-11 05:19:59,973 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-11 05:19:59,973 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-01-11 05:19:59,974 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-01-11 05:19:59,978 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-01-11 05:19:59,979 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-11 05:19:59,980 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2022-01-11 05:19:59,985 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2022-01-11 05:19:59,985 INFO L858 garLoopResultBuilder]: For program point L-1(line -1) no Hoare annotation was computed. [2022-01-11 05:19:59,985 INFO L858 garLoopResultBuilder]: For program point L31(line 31) no Hoare annotation was computed. [2022-01-11 05:19:59,985 INFO L858 garLoopResultBuilder]: For program point L31-2(line 31) no Hoare annotation was computed. [2022-01-11 05:19:59,985 INFO L858 garLoopResultBuilder]: For program point L12(line 12) no Hoare annotation was computed. [2022-01-11 05:19:59,986 INFO L861 garLoopResultBuilder]: At program point L32(lines 27 33) the Hoare annotation is: true [2022-01-11 05:19:59,986 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 12) no Hoare annotation was computed. [2022-01-11 05:19:59,986 INFO L858 garLoopResultBuilder]: For program point L10(lines 10 13) no Hoare annotation was computed. [2022-01-11 05:19:59,986 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2022-01-11 05:19:59,986 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2022-01-11 05:19:59,989 INFO L732 BasicCegarLoop]: Path program histogram: [1] [2022-01-11 05:19:59,992 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2022-01-11 05:19:59,999 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 11.01 05:19:59 BasicIcfg [2022-01-11 05:19:59,999 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-01-11 05:20:00,000 INFO L158 Benchmark]: Toolchain (without parser) took 907.38ms. Allocated memory was 185.6MB in the beginning and 270.5MB in the end (delta: 84.9MB). Free memory was 131.3MB in the beginning and 205.7MB in the end (delta: -74.4MB). Peak memory consumption was 11.9MB. Max. memory is 8.0GB. [2022-01-11 05:20:00,000 INFO L158 Benchmark]: CDTParser took 0.10ms. Allocated memory is still 185.6MB. Free memory is still 147.4MB. There was no memory consumed. Max. memory is 8.0GB. [2022-01-11 05:20:00,000 INFO L158 Benchmark]: CACSL2BoogieTranslator took 181.78ms. Allocated memory was 185.6MB in the beginning and 270.5MB in the end (delta: 84.9MB). Free memory was 131.1MB in the beginning and 244.0MB in the end (delta: -112.9MB). Peak memory consumption was 7.7MB. Max. memory is 8.0GB. [2022-01-11 05:20:00,001 INFO L158 Benchmark]: Boogie Procedure Inliner took 24.70ms. Allocated memory is still 270.5MB. Free memory was 243.5MB in the beginning and 242.3MB in the end (delta: 1.2MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. [2022-01-11 05:20:00,001 INFO L158 Benchmark]: Boogie Preprocessor took 29.92ms. Allocated memory is still 270.5MB. Free memory was 242.3MB in the beginning and 241.4MB in the end (delta: 924.9kB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. [2022-01-11 05:20:00,001 INFO L158 Benchmark]: RCFGBuilder took 171.78ms. Allocated memory is still 270.5MB. Free memory was 241.4MB in the beginning and 231.9MB in the end (delta: 9.4MB). Peak memory consumption was 9.4MB. Max. memory is 8.0GB. [2022-01-11 05:20:00,002 INFO L158 Benchmark]: IcfgTransformer took 68.26ms. Allocated memory is still 270.5MB. Free memory was 231.4MB in the beginning and 228.8MB in the end (delta: 2.6MB). Peak memory consumption was 3.1MB. Max. memory is 8.0GB. [2022-01-11 05:20:00,002 INFO L158 Benchmark]: TraceAbstraction took 425.36ms. Allocated memory is still 270.5MB. Free memory was 228.3MB in the beginning and 205.7MB in the end (delta: 22.6MB). Peak memory consumption was 23.1MB. Max. memory is 8.0GB. [2022-01-11 05:20:00,004 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10ms. Allocated memory is still 185.6MB. Free memory is still 147.4MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 181.78ms. Allocated memory was 185.6MB in the beginning and 270.5MB in the end (delta: 84.9MB). Free memory was 131.1MB in the beginning and 244.0MB in the end (delta: -112.9MB). Peak memory consumption was 7.7MB. Max. memory is 8.0GB. * Boogie Procedure Inliner took 24.70ms. Allocated memory is still 270.5MB. Free memory was 243.5MB in the beginning and 242.3MB in the end (delta: 1.2MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. * Boogie Preprocessor took 29.92ms. Allocated memory is still 270.5MB. Free memory was 242.3MB in the beginning and 241.4MB in the end (delta: 924.9kB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. * RCFGBuilder took 171.78ms. Allocated memory is still 270.5MB. Free memory was 241.4MB in the beginning and 231.9MB in the end (delta: 9.4MB). Peak memory consumption was 9.4MB. Max. memory is 8.0GB. * IcfgTransformer took 68.26ms. Allocated memory is still 270.5MB. Free memory was 231.4MB in the beginning and 228.8MB in the end (delta: 2.6MB). Peak memory consumption was 3.1MB. Max. memory is 8.0GB. * TraceAbstraction took 425.36ms. Allocated memory is still 270.5MB. Free memory was 228.3MB in the beginning and 205.7MB in the end (delta: 22.6MB). Peak memory consumption was 23.1MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 12]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 10 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 0.3s, OverallIterations: 1, TraceHistogramMax: 1, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 1 SdHoareTripleChecker+Valid, 0.0s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 1 mSDsluCounter, 8 SdHoareTripleChecker+Invalid, 0.0s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 3 mSDsCounter, 0 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 2 IncrementalHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 0 mSolverCounterUnsat, 5 mSDtfsCounter, 2 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=10occurred in iteration=0, InterpolantAutomatonStates: 3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 1 LocationsWithAnnotation, 1 PreInvPairs, 2 NumberOfFragments, 1 HoareAnnotationTreeSize, 1 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 1 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.1s InterpolantComputationTime, 4 NumberOfCodeBlocks, 4 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 3 ConstructedInterpolants, 0 QuantifiedInterpolants, 9 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 27]: Loop Invariant Derived loop invariant: 1 RESULT: Ultimate proved your program to be correct! [2022-01-11 05:20:00,040 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...