*** This bug is a duplicate of bug 543617 ***
https://bugs.launchpad.net/bugs/543617
** This bug has been marked a duplicate of bug 543617
very slow filesystem I/O
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kernel lockups unmounting ext4 lvm2 snapshots
https://bugs.launchpad.net/bugs/536994
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** Changed in: linux (Ubuntu Lucid)
Importance: Low => High
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kernel lockups unmounting ext4 lvm2 snapshots
https://bugs.launchpad.net/bugs/536994
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Bugs, which is subscribed to Ubuntu.
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ubuntu-bu
@Kees, Can you please do the following:
1) echo 1 >/proc/sys/kernel/lock_stat
fire the unmount command.
2) less /proc/lock_stat
If you could attach the output of the previous command then we could check if
there is some lock contention occurring.
You could then disable lock_stat as follows:
3) e
** Changed in: linux
Status: Unknown => Invalid
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kernel lockups unmounting ext4 lvm2 snapshots
https://bugs.launchpad.net/bugs/536994
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@Kees:
I found an upstream bug that seems related to this. It's currently
marked closed because it was unreproducible. If you have a scenario that
you can reproduce, I suggest reopening the bug with more information.
** Bug watch added: Linux Kernel Bug Tracker #14430
http://bugzilla.kernel.or
** Description changed:
I have experienced IO lock-ups when unmounting lvm2 snapshots partitions
containing ext4. All IO, sound, etc will hang, though alt-sysrq remains
responsive (I can do alt-sysrq-b and it reboots, e.g.).
This problem is intermittent, unfortunately, but I see it mos
Here's the view of latencytop when the umount actually finishes (when
I'm lucky).
** Attachment added: "latency-top.png"
http://launchpadlibrarian.net/40735409/latency-top.png
** Also affects: linux (Ubuntu Lucid)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Lucid)
Oops, missed a line:
root 8547 0.0 0.0 8208 712 pts/3D+ 15:52 0:00 umount
/var/lib/schroot/mount/hardy-abfa271e-3dbb-4462-90b5-635912bd55c1
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kernel lockups unmounting ext4 lvm2 snapshots
https://bugs.launchpad.net/bugs/536994
You received this bug notification because you ar
Sometimes I'll survive a lock up if I just wait long enough. I see my
load hit 1 solid for a long time, and I see in ps output:
$ ps auwwx | grep " D "
root 7143 0.0 0.0 0 0 ?D15:51 0:00 [kdmflush]
root 7146 0.1 0.0 0 0 ?D15:51 0:00 [kco
** Attachment added: "AlsaDevices.txt"
http://launchpadlibrarian.net/40733896/AlsaDevices.txt
** Attachment added: "ArecordDevices.txt"
http://launchpadlibrarian.net/40733897/ArecordDevices.txt
** Attachment added: "BootDmesg.txt"
http://launchpadlibrarian.net/40733898/BootDmesg.txt
**
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