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The History and Future of Crash Dumps in FreeBSD

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The History and Future of Crash Dumps in FreeBSD
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The History and Future of Core Dumps in FreeBSD*: *and other related OS
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31
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CC Attribution 3.0 Unported:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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Crash dumps, also known as core dumps, have been a part of BSD since its' beginnings in Research UNIX. Though 38 years have passed since doadump() came about in UNIX/32V, core dumps are still needed and utilized in much the same way they were then. This talk will provide an extensive background on core dumps, including a complete history, a summary of the present state and a discussion on the future of the core dump routine in FreeBSD. One might assume the core dump code has changed little over time but, with some research, this assumption has proven incorrect. What has changed over time is the amount of RAM in the machines we expect to be able to get a crash dump from. Because of this, underlying assumptions about the size of swap partitions in respect to the size of kernel virtual memory are proving incorrect, disabling core dumps in many machines. To avoid these pitfalls, several extensions to the core dump code have been created over time but have never made it upstream. These extensions include gzip compressed dumps and dumping over the network. In addition, other related operating systems like macOS (formerly Mac OS X) and Illumos have several of the features that would be useful in FreeBSD including dumping to swap on a ZVOL, live core dumps and tools to estimate the size of a core dump on a running machine. This talk begins with a quick background on what core dumps are and why operators might need them. Following that the current state of the core dump facility and some of the more common extensions in use are examined. We conclude with a call to action for upstreaming these extensions and modularizing the core dump code such that different methods of core dump can be dynamically loaded into the kernel on demand. By the end of this talk attendees will have a thorough knowledge of what core dumps are, why they're useful, how they've been done in the past and what improvements could be made in the future.
Core dumpCrash (computing)System programmingOpen setComputerMathematicsBlogPartition (number theory)Scripting languageCrash (computing)Hydraulic jumpCore dumpMultiplication signSoftware repositoryComputer engineeringOpen setPartition (number theory)Network topologyDatabaseAbstract machineSoftware bugWritingRepository (publishing)WeightProjective planeCodeComputer sciencePhysical systemScripting languageSlide ruleWeb pageUniverse (mathematics)MathematicsInformation securityLoginXMLComputer animation
Core dumpCrash (computing)Core dumpRight angleKernel (computing)Magnetic-core memoryMultiplication signInformationCrash (computing)Form (programming)Process (computing)BitState of matterSemiconductor memoryPoint (geometry)Computer animation
Core dumpEncryptionArchitectureFunction (mathematics)Field extensionTime line <Programm>Computer networkTape driveAreaCrash (computing)MathematicsCore dump1 (number)SoftwareSemiconductor memoryOcean currentEncryptionField extensionSoftware bugComputer fileCodeExtension (kinesiology)Computer architectureAsynchronous Transfer ModeFunction (mathematics)EmailElectronic mailing listAreaLine (geometry)File formatNetwork topologyWeb pageSeries (mathematics)Magnetic tapeSoftware repository6 (number)AuthorizationBookmark (World Wide Web)Modul <Datentyp>Quantum stateAbstract machineXMLComputer animation
Core dumpPairwise comparisonCore dumpPairwise comparisonCrash (computing)Configuration spaceMiniDiscProcedural programmingDefault (computer science)Hydraulic jumpDemosceneAbstract machineCompilation albumPartition (number theory)Computer animation
Electric currentCore dumpFunction (mathematics)Read-only memoryMathematical analysisFile formatFile formatMathematical analysisCore dumpMultiplication signProcedural programmingFunction (mathematics)Computer programStructural loadVarianceMereologySemiconductor memoryBootingPartition (number theory)Crash (computing)Computer animation
Core dumpContent (media)BacktrackingStatisticsPhysical systemInformationString (computer science)MetadataCore dumpScripting languageState of matterDifferent (Kate Ryan album)InformationFile formatMultiplication signString (computer science)MetadataComputer fileContent (media)Computer animation
Hydraulic jumpFile formatMiniDiscCore dumpRead-only memoryBootingScalable Coherent InterfaceCrash (computing)Core dumpFile formatBinary codeForcing (mathematics)Computer programBootingBitRight angleEmailPartition (number theory)Content (media)Semiconductor memoryMultiplication signComputer animation
Data bufferFile formatMiniDiscCore dumpWeb pageKernel (computing)Directory serviceRead-only memoryCore dumpSemiconductor memoryWeb pageFile formatWeb 2.0SpacetimeAbstract machineComputer animation
Core dumpMotion captureKernel (computing)InformationMiniDiscRead-only memoryCore dumpKernel (computing)InformationBinary codeType theoryScripting languageForm (programming)QuicksortComputer fileMultiplication signComputer animation
Core dumpContent (media)Message passingData bufferKernel (computing)Revision controlString (computer science)Configuration spaceFunction (mathematics)File formatMiniDiscFormal grammarComputer fileMereologyScripting languageCore dumpDifferent (Kate Ryan album)Revision controlFlow separationMessage passingFunction (mathematics)Archaeological field surveyFile formatMiniDiscComputer animation
Core dumpOperator (mathematics)Crash (computing)Pairwise comparisonInformationMathematical analysisDirected graphNetwork topologyKernel (computing)Figurate numberKernel (computing)Core dumpCrash (computing)DebuggerFile archiverMultilaterationPairwise comparisonDirected graphInformationFile formatMultiplication signSymbol tableMathematical analysisProduct (business)Computer animation
Core dumpMach's principleLocal ringComputer networkData compressionEstimationPartition (number theory)Interactive televisionCalculationKernel (computing)LaptopSimilarity (geometry)Integrated development environmentGame controllerData storage deviceTimestampData modelField extensionModul <Datentyp>CodeEncryptionInformationRevision controlMaxima and minimaModule (mathematics)Core dumpProcedural programmingProcess (computing)QuicksortProduct (business)SpacetimeAnalytic continuationKernel (computing)MereologyComputing platformCrash (computing)CodeLocal ringDefault (computer science)Revision controlWeightEstimatorMixed realityCovering spaceDemonWeb pageEncryptionModule (mathematics)CASE <Informatik>SoftwareIntegrated development environmentLaptopData storage deviceHard disk driveField extensionModul <Datentyp>InformationSlide ruleMatching (graph theory)Data compressionNumberAbstract machineDifferent (Kate Ryan album)Set (mathematics)Partition (number theory)Physical systemFigurate numberDirected graphExtension (kinesiology)TesselationMagnetic stripe cardTimestampAdditionGame controllerEndliche ModelltheorieData centerDatabaseOperating systemLine (geometry)FlagComputer animation
Core dumpFile formatMiniDiscEstimationExecution unitCalculationPartition (number theory)Web pageGraph (mathematics)Module (mathematics)Revision controlEmailBinary codeCodeMaxima and minimaKernel (computing)InformationPartition (number theory)Core dumpData compressionComputer animationSource codeXML
Core dumpData compressionData compressionProcess (computing)Computer fileCore dumpFile systemPartition (number theory)Computer animation
Core dumpData compressionPatch (Unix)Partition (number theory)AdditionMiniDiscRoutingMultiplication signCodeEmailElectronic mailing listThread (computing)Core dumpAbstract machineData compressionPatch (Unix)AdditionMagnetic stripe cardReal numberComputer animation
EncryptionCore dumpKernel (computing)Crash (computing)InformationWeb pageSet (mathematics)File formatKey (cryptography)EncryptionSensitivity analysisKernel (computing)Core dumpPasswordInformationIntegrated development environmentProcess (computing)MereologyRight angleProcedural programmingMiniDiscComputer animation
EncryptionCore dumpFile formatMiniDiscKernel (computing)StrutGraph (mathematics)AlgorithmString (computer science)Symmetric matrixCore dumpKernel (computing)Key (cryptography)EmailString (computer science)Symmetric-key algorithmElectronic mailing listComputer animation
Core dumpField extensionTotal S.A.Core dumpModul <Datentyp>Extension (kinesiology)CodeQuicksortProduct (business)WeightRight angleMereologyGoodness of fitPhysical systemComputer animation
CodeEmailMessage passingInformationCore dumpField extensionAsynchronous Transfer ModePhysical systemProduct (business)Online helpEntire functionAsynchronous Transfer ModeEmailCodeComputer fileInformationMultiplication signSheaf (mathematics)Revision controlUniverse (mathematics)Self-organizationMessage passingComputer animation
Slide ruleCodeSimulationNominal numberRootCore dumpFile formatArchitecturePartition (number theory)Default (computer science)Multiplication signCore dumpQuicksortInformationComputer architectureOperating systemAlpha (investment)Computer animationXMLProgram flowchartSource code
SimulationCore dumpMaizeCorrelation and dependenceCoprocessorDifferent (Kate Ryan album)MereologyOperating systemQuicksortOperator (mathematics)EmailComputer animationSource codeXML
Patch (Unix)CodeRevision controlCore dumpModul <Datentyp>EmailSimulationRootSynchronizationAlpha (investment)OvalSlide ruleLink (knot theory)Software repositoryDifferent (Kate Ryan album)Slide ruleLink (knot theory)InternetworkingRight angleConnectivity (graph theory)Core dumpKernel (computing)Reading (process)Semiconductor memoryMathematicsSpacetimeProcess (computing)Structural loadSoftware repositoryFunction (mathematics)QuicksortContext awarenessBitSoftwareCodeRevision controlState of matterRepository (publishing)Branch (computer science)Goodness of fitMetropolitan area networkProjective planeEstimatorSource codeXMLComputer animationProgram flowchart
Transcript: English(auto-generated)