Looks like two patches are landing in next to resolve this:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?h=next-20220527=8b48ec23cc51a4e7c8dbaef5f34ebe67e1a80934
** Tags added: patch
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https://bugs.launchpad.net/bugs/1942935
Title:
kernel io hangs during mdcheck/resync
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Same issue on impish 5.13.13 kernel, running in VBox.
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https://bugs.launchpad.net/bugs/1942935
Title:
kernel io hangs during mdcheck/resync
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** Patch added: "md-reap-sync-thread.patch"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1942935/+attachment/5526028/+files/md-reap-sync-thread.patch
** Tags added: apport-collected impish
** Description changed:
It seems to always occur during an mdcheck/resync, if I am logged in
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1942935
Title:
kernel io hangs during mdcheck/resync
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** Tags removed: hirsute
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Title:
kernel io hangs during mdcheck/resync
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** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Title:
kernel io hangs during mdcheck/resync
To manage
Here is Donald Buczek's reproducer script. I setup an Ubuntu 20.04 VM
with latest linux-image-generic and was able to reproduce it within
maybe 10 or 15 minutes. Exactly the same issue.
Filesystem layout built as follows:
# assemble raid devices
mdadm --create /dev/md0 --level=1
The patch hasn't made it into mainline from what I have seen, it looks
like it died back in March waiting for feedback from additional kernel
developers. From what I have gathered this is a deadlock scenario
directly caused by pausing the resync while the system is under heavy
write activity.
One of the systems was using package linux-generic and in practice
Linux pedabackup 5.4.0-80-generic #90-Ubuntu SMP Fri Jul 9 22:49:44 UTC
2021 x86_64 x86_64 x86_64 GNU/Linux
$ cat /proc/version_signature
Ubuntu 5.4.0-80.90-generic 5.4.124
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-signed-hwe-5.11 (Ubuntu)
Status: New => Confirmed
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I think I've seen this issue once per two different systems so I think
this is software issue. Does anybody know if patch in comment #6 is
going to be included in Ubuntu 20.04 LTS?
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Here is the proposed patch, Doesn't appear to have been applied. Last
report was with 5.11rc5.
https://lore.kernel.org/linux-raid/1613177399-22024-1-git-send-email-
guoqing.ji...@cloud.ionos.com/
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Similar report here on 5.10.0-rc4:
https://www.spinics.net/lists/raid/msg66654.html
I ended up masking the services introduced with 20.04 LTS, and switched back
the crontab.
systemctl mask mdcheck_continue.service mdcheck_continue.timer
mdcheck_start.service mdcheck_start.timer
cat >
Hi Kleber,
I installed it later yesterday, but I won't know until the next resync. This
has been a problem since at least linux 5.4 kernel that shipped with Ubuntu
20.04. I don't think I had these problems on Ubuntu 18.04 LTS, the same
hardware, running the linux-image-generic at that time.
Hello Chad Wagner,
Thank you for reporting this issue. Could you please try installing the
latest 20.04 HWE kernel and check whether the problem persists? The
version currently in focal-updates is 5.11.0-34.36~20.04.1.
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** Attachment added: "screenlog.txt"
https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-5.11/+bug/1942935/+attachment/5523575/+files/screenlog.txt
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