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 >
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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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.
Public bug reported:
It seems to always occur during an mdcheck/resync, if I am logged in via
SSH it is still somewhat responsive and basic utilities like dmesg will
work. But it apppears any write I/O will hang the terminal and nothing
is written to syslog (presumably because it is blocked).
** 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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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.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1942935
Title:
kernel io hangs during mdcheck/resync
** 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
apport information
** Attachment added: "AlsaDevices.txt"
https://bugs.launchpad.net/bugs/1942935/+attachment/5526029/+files/AlsaDevices.txt
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apport information
** Attachment added: "CRDA.txt"
https://bugs.launchpad.net/bugs/1942935/+attachment/5526030/+files/CRDA.txt
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apport information
** Attachment added: "Card0.Codecs.codec97.0.ac97.0-0.txt"
https://bugs.launchpad.net/bugs/1942935/+attachment/5526031/+files/Card0.Codecs.codec97.0.ac97.0-0.txt
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apport information
** Attachment added: "Card0.Codecs.codec97.0.ac97.0-0.regs.txt"
https://bugs.launchpad.net/bugs/1942935/+attachment/5526032/+files/Card0.Codecs.codec97.0.ac97.0-0.regs.txt
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apport information
** Attachment added: "ProcCpuinfo.txt"
https://bugs.launchpad.net/bugs/1942935/+attachment/5526034/+files/ProcCpuinfo.txt
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apport information
** Attachment added: "ProcCpuinfoMinimal.txt"
https://bugs.launchpad.net/bugs/1942935/+attachment/5526035/+files/ProcCpuinfoMinimal.txt
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apport information
** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/1942935/+attachment/5526036/+files/ProcInterrupts.txt
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apport information
** Attachment added: "CurrentDmesg.txt"
https://bugs.launchpad.net/bugs/1942935/+attachment/5526033/+files/CurrentDmesg.txt
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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
Status in
apport information
** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/1942935/+attachment/5526038/+files/UdevDb.txt
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apport information
** Attachment added: "acpidump.txt"
https://bugs.launchpad.net/bugs/1942935/+attachment/5526040/+files/acpidump.txt
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apport information
** Attachment added: "ProcModules.txt"
https://bugs.launchpad.net/bugs/1942935/+attachment/5526037/+files/ProcModules.txt
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apport information
** Attachment added: "WifiSyslog.txt"
https://bugs.launchpad.net/bugs/1942935/+attachment/5526039/+files/WifiSyslog.txt
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** Tags removed: hirsute
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https://bugs.launchpad.net/bugs/1942935
Title:
kernel io hangs during mdcheck/resync
Status in linux package in Ubuntu:
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1942935
Title:
kernel io hangs during
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
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
I believe to resolve the deadlock you want to do:
echo active > /sys/block/md1/md/array_state
Not "idle". You should see a hung task for mdcheck in there somewhere as well,
and it only occurs when the raid is resyncing (md_resync should be running), at
least for me I the workaround in comment
Yeah, that's the same issue as this one. The issue is the raid is doing
a consistency check (mdcheck) and is transitioned to an "idle" state and
hits a deadlock that causes all I/O through the md device to block. The
workaround is to change the array state back to active.
I made the changes in
Comment #5 (https://bugs.launchpad.net/ubuntu/+source/linux-signed-
hwe-5.11/+bug/1942935/comments/5) has been a stable workaround for me
(basically revert back to a continuous resync like 18.04).
My newer machines are using ZFS with raidz2 pools.
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Apparently 2.2.1 did not fix the issue, there is an on-going PR
https://github.com/openzfs/zfs/pull/15571 that has the latest fix for
the data corruption. As a side note it also affects zfs 2.1 series
(block cloning made it more evident, but apparently possible to happen
on earlier zfs releases),
It appears upstream is prepping a 2.1.14 and 2.2.2 release that includes this
fix to both branches.
https://github.com/openzfs/zfs/pull/15601
https://github.com/openzfs/zfs/pull/15602
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Reproducible on Ubuntu 22.04 LTS w/ linux-hwe-6.2 (zfs-2.1.9) using the
NixOS test suite:
[zhammer::647] checking 1 files at iteration 0
[zhammer::647] zhammer_647_0 differed from zhammer_647_576!
[zhammer::647] Hexdump diff follows
--- zhammer_647_0.hex 2023-11-30 15:37:43.887596987 +
Forgot to mention you also need coreutils-9.0 or later, or some other
program that uses lseek SEEK_HOLE/SEEK_DATA as that is the culprit for
the bug. Essentially it errorneously reports holes in files that are
still dirty buffers. I had a local copy of "cp" from coreutils/sid
compiled for jammy.
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