Recently hit that on Focal due to the fact that quotas were enabled by
LXD.
This renders the system completely unresponsive if you use btrfs as a
rootfs with btrfs-transaction or btrfs-cleaner kernel threads hogging a
100% of 1 CPU core.
Booting using a live USB, disabling quotas and temporarily
See also: https://github.com/lxc/lxd/issues/7029
** Bug watch added: LXD bug tracker #7029
https://github.com/lxc/lxd/issues/7029
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** Tags added: cscc
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Title:
FS access deadlock with btrfs quotas enabled
Status in linux package in Ubuntu:
Triaged
Status in lin
I see, thanks for the info.
I'll report my findings so far here, in case it turns out useful to some
future person landing on this bug later:
The call trace of the deadlocked btrfs-cleaner kthread is as follows.
Tainted: P OE4.15.0-45-generic #48-Ubuntu
btrfs-cleaner D0
Hm, it's been a while...
I think back then I made some btrfs developers aware of it on IRC, but never
got around to sending it to the mailing list.
I'm running my own kernel builds for now (I had to do that to fix some other
issues anyway) with the patch from comment #4 applied, which seems to re
I confirm I'm having this problem too since migrating to Bionic from
Xenial.
My setup is a bit analogous to the original bug reporter: I have 5
drives (22 TB) in RAID1, organized in around 10 subvolumes with up to 20
snapshots per subvolume.
After some hours running normally, at some point [btrfs
This issue appears to be an upstream bug, since the bug still exists in
mainline without a revert. Would it be possible for you to open an upstream bug
report[0] and maybe ping the patch author?
That will allow the upstream Developers to examine the issue, and may provide
a quicker resolution
** Changed in: linux (Ubuntu Bionic)
Status: Incomplete => Confirmed
** Tags added: kernel-bug-exists-upstream
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Title:
FS ac
** Tags added: patch
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Title:
FS access deadlock with btrfs quotas enabled
Status in linux package in Ubuntu:
Incomplete
Status in
I can confirm that the issue still exists in the mainline kernel build
linked above.
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Title:
FS access deadlock with btrfs quotas en
This patch seems to fix it for me (running that for several days now).
** Patch added: "0002-qgroup_accounting_fix.patch"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1765998/+attachment/5126022/+files/0002-qgroup_accounting_fix.patch
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I tried to build a Bionic test kernel with commit fb235dc reverted, but
it does not revert cleanly and requires a back port. Do you have the
back port you performed and can post to the bug?
Also, would it be possible for you to test the latest mainline kernel to
see if the bug is already fixed up
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Also affects: linux (Ubuntu Bionic)
Importance: High
Status: Confirmed
** Tags added: bionic kernel-da-key
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I cannot run the affected (production) system using a broken kernel, and it
will lockup after boot within seconds.
If necessary, I can provide additional information or testing upon request.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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