Sorry - I see right now that the bug is slightly different:
Mine has the NULL pointer dereference in abd_verify while the above
posted trace shows abd_borrow_buf.
[ 7081.805511] BUG: kernel NULL pointer dereference, address:
[ 7081.805517] #PF: supervisor read access in kernel
Hello!
I've just encountered the bug too. I was receiving a snapshot while I was
installing packages in a chroot running on a dataset. Both hung.
I was running 20.10 from the live DVD (downloaded today) with the pre-installed
ZFS version. I don't have access to the exact version numbers right
Marking it as invalid. Fee free to re-open this bug if it occurs again.
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
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I marked it incomplete so it will expire on its own if there is no new
information, but feel free to actually close it if you prefer ("invalid"
is fine).
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+1, this is not like sarnold's crash-with-every-snapshot-send
** Changed in: linux (Ubuntu)
Status: Triaged => Incomplete
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https://bugs.launchpad.net/bugs/1870559
Considering it is a rare issue that does not seem to be reproducible,
perhaps it may be a spurious corruption issue of some sort. I've not
seen any similar bug reports against ZFS so it is a curious issue.
Perhaps we should close this bug and re-open it if you hit it again.
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Sorry, I mistook this for a comment on another zfs bug that I was
watching.
I haven't seen that crash again since the day I reported it. Since it's so rare
(happened just once), do you think it's worth it to try the kernel from the
ppa? I'd rather not stay away from the official focal kernel
@Ping? Any chance of trying out my debug test debs?
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https://bugs.launchpad.net/bugs/1870559
Title:
Kernel NULL pointer dereference while receiving zfs snapshots
Status
I've debugged this back down the stack and there is a null pointer that
should be caught by some assert checks but strangely isn't being
reported, so a null pointer crash in the abd_verify function is most
unexpected.
I've build a zfs debug package that contains more information of
internal
zfs-dkms was not being used, I had no need for it on this machine. I
only have zfs-dkms in my pi4, since the ubuntu kernel there doesn't
include the zfs module.
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Urm, it's going to be tricky to debug this as I can't figure out why
abd_verify is being shown but the object code isn't able to find this
symbol when I dig into it. Any idea if zfs-dkms was being used?
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Sorry, I've since reinstalled the server. The same pool is there, and
it's still focal, but the OS disk was reinstalled. I used it to test the
subiquity server installer.
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Do you mind running the following command and posting the output to the
bug?
dpkg -l | grep zfs
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https://bugs.launchpad.net/bugs/1870559
Title:
Kernel NULL pointer
For reference, the splat was:
[ 2465.077373] BUG: kernel NULL pointer dereference, address:
[ 2465.077397] #PF: supervisor read access in kernel mode
[ 2465.077403] #PF: error_code(0x) - not-present page
[ 2465.077409] PGD 0 P4D 0
[ 2465.077415] Oops: [#1] SMP NOPTI
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