Hi,
we ran some tests on 24.04 and, so far, haven't seen any panics anymore.
I'll leave it running for another couple of hours and then change the
tag to verification-done-noble as requested.
I'm going with zfs-dkms here, because it doesn't look like there's an
updated linux-image-generic package yet. I assume that there will be an
update of linux-image-generic at some point, so that we don't have to
run zfs-dkms. :-)
Thank you!
Here's what we did:
1. Installed the packages from noble-proposed:
apt install zfs-dkms/noble-proposed libzfs4linux/noble-proposed
zfs-zed/noble-proposed zfsutils-linux/noble-proposed
libuutil3linux/noble-proposed libzpool5linux/noble-proposed
libnvpair3linux/noble-proposed
2. Rebooted and verified that the new versions are being used:
# dpkg -l | grep zfs
ii libzfs4linux 2.2.2-0ubuntu9.3
ii zfs-dkms 2.2.2-0ubuntu9.3
ii zfs-zed 2.2.2-0ubuntu9.3
ii zfsutils-linux 2.2.2-0ubuntu9.3
# uname -a
Linux foo 6.8.0-60-generic #63-Ubuntu SMP PREEMPT_DYNAMIC Tue Apr 15
19:04:15 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
# modinfo zfs | head -n 2
filename: /lib/modules/6.8.0-60-generic/updates/dkms/zfs.ko.zst
version: 2.2.2-0ubuntu9.3
3. Ran the reproducer from the bug description (this is running in the
same VM that showed the kernel panics earlier):
# zpool create pooltest sdb
# zfs create pooltest/data
# cd /pooltest/data
# python3 ~/zfs_write_unified.py .
Wait a little bit (about 1 round of the Python script), then create
the snapshot:
# zfs snapshot pooltest/data@snapshot1
Then run the mount/umount loop while the Python script is still
running:
# while true; do printf .; mount -t zfs pooltest/data@snapshot1
/var/tmp/snapshot1 && sleep 0.5 && umount /var/tmp/snapshot1; done
This previously showed kernel panics or a stuck mount/umount at some
point.
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https://bugs.launchpad.net/bugs/2110885
Title:
Kernel panic when unmounting ZFS snapshots
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