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Message #41818
Re: [Bug 1073433] Re: Ext4 corruption associated with shutdown of Ubuntu 12.10
On Wed, Jan 22, 2014 at 05:11:03PM -0000, Clint Byrum wrote:
> The other one is the one that would sweep up the mess we occasionally
> see when something misbehaves.
> I'd like to see Ubuntu's shutdown do more to protect against that
> failure mode.
I would, too, but I don't agree that the method he proposes actually does
this. Killing processes and unmounting devices in a loop is basically what
we do already; the key difference is that some filesystems - potentially
even including the root filesystem - may require additional daemon processes
for their operation. This is the case for example if you have network
filesystems mounted and are using NetworkManager, or if you use
gss-encrypted NFS, or iscsi. So "kill all processes and unmount all
filesystems in a loop" is not a reliable shutdown mechanism, it just moves
the problem cases somewhere that Lennart apparently isn't seeing them.
One of the problems we've seen repeatedly with trying to get clean shutdown
involves NetworkManager's child processes *being* killed while they're still
needed as part of managing the network. This is not a bug that's fixed by
killing more processes.
There may be other failure scenarios that need to be addressed. Part of the
problem has been a lack of information about what's actually holding the
root filesystem open in these cases. There's a pending merge proposal on
sysvinit that should help us gather this information.
--
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https://bugs.launchpad.net/bugs/1073433
Title:
Ext4 corruption associated with shutdown of Ubuntu 12.10
Status in Upstart:
Confirmed
Status in “linux” package in Ubuntu:
Incomplete
Status in “network-manager” package in Ubuntu:
Triaged
Status in “upstart” package in Ubuntu:
Confirmed
Bug description:
1. Format and label a target Ext4 partion using Ubuntu 12.04
2. Install 64bit 12.10 OS using that target without reformatting it
3. Shut down
4. Boot an alternate copy of Ubuntu
5. Restart selecting the newly installed OS
6. Login then shutdown
6. Boot an alternate copy of Ubuntu
7.Fsck the newly installed OS allowing corrections to be made
Each time the the newly installed OS is executed and then shutdown,
even if execution only consists of logging on, a subsequent fsck will
FAIL.
I used Acronis True Image Home 2013 to create an image of the newly
installed 64-bit Ubuntu 12.10, so I can recreate the symptoms of Ext4
filesystem corruption 100% of the time by restoring from the image,
booting, logging on and shutting down.
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.5.0-17-generic 3.5.0-17.28
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.6.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: aguru 1871 F.... pulseaudio
/dev/snd/controlC0: aguru 1871 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Date: Tue Oct 30 22:24:54 2012
HibernationDevice: RESUME=UUID=f22e3fa5-c5c5-41f1-ae5a-49390547cb67
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
IwConfig:
eth0 no wireless extensions.
lo no wireless extensions.
MachineType: System manufacturer P5Q-E
ProcEnviron:
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-17-generic root=UUID=ef2c78d5-783a-422a-88f7-27ec09dda0d1 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.5.0-17-generic N/A
linux-backports-modules-3.5.0-17-generic N/A
linux-firmware 1.95
RfKill:
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/06/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2101
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P5Q-E
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2101:bd04/06/2009:svnSystemmanufacturer:pnP5Q-E:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5Q-E:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: P5Q-E
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
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References