Hi Elvis, both kernels (for Eoan and Focal) are officially released; the
versions are 5.3.0-62 (Eoan) and 5.4.0-40 (Focal). Thanks for the report!
Cheers,
Guilherme
** Changed in: linux (Ubuntu Eoan)
Status: Fix Committed => Fix Released
** Changed in: linux (Ubuntu Focal)
Status
👍
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https://bugs.launchpad.net/bugs/1885010
Title:
NULL deference in nfs4_get_valid_delegation
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Hi Elvis, excellent to hear your long production job finishes
successfully on your test kernel and on 5.4.0-40 from -proposed.
Looking at the schedule, 5.4.0-40 should be released to -updates in the
next day or two, and it will be exactly the same package that was in
-proposed. I'll mark this bug
The test on 5.4.0-40.44 from focal-proposed was successful, so I would
say that the fix did it. Thanks for including it!
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Title:
NULL deference i
The long production job with the custom built kernel finished
successfully. I'm very confident this fixes our issue. Now running with
5.4.0-40.44 from focal-proposed as a test. I'll let it run for a few
hours. It usually hits the crash in an hour or so.
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That's great for me Elvis, whenever you can =)
I'm glad you could build the kernel with the fix!
Cheers,
Guilherme
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Title:
NULL deference in nf
Ah, I would really like to get this job that is running done first. It's
processing some data we need to ideally should deliver on Monday. It's
looking good so far, so I'm quite confident the fix is good.
When it's done processing, I can give 5.4.0-40 from proposed a try and
restart the job again.
Oh, good news Elvis: just checked and 5.4.0-40 is available in -proposed. Can
you give it a try?
Thanks,
Guilherme
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Title:
NULL deference in n
No worries Guilherme, that explains it.
I've now built my own kernel from the Ubuntu-5.4.0-38.42 Git tag, which
I've verified includes the fix. I'm running our workload again with this
kernel and will know within a few hours whether it's looking good. The
job as a whole is going to take the full w
Hi Matthew, thanks for looking into that! I was re-checking the Git tree, and
the commit _is_ present on 5.4.0-38 but..not in 5.4.0-39 heheh
And it's back on 5.4.0-40. What happened is that 5.4.0-39 was a security
release, based on 5.4.0-37! So, it's basically 5.4.0-37 + 1 security patch.
My mis
Hi Matthew, thanks a lot for looking into this. Like you, I looked at
Git to double-check, and thought the fix was in there, but it was next
on my list to actually double-double-check, since I thought it so
strange the issue wasn't gone.
Thanks for offering to build a test kernel! I will have a go
Hi Elvis, Guilherme
Guilherme, I went and had a look at what was built into
5.4.0-39-generic, and the commit "nfs: fix NULL deference in
nfs4_get_valid_delegation" wasn't there.
>From what I can see looking at the git tree located at:
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/
I'm sad to say, but it seems it did not fix our problem. The crash
happened again after running for about an hour:
[ 4914.661585] BUG: unable to handle page fault for address: ffb0
[ 4914.661620] #PF: supervisor read access in kernel mode
[ 4914.661638] #PF: error_code(0x) - not-pr
Thanks Elvis, no hurries. And no need to be ashamed, there's a bunch of
tags/trees, and this is not released yet (just on proposed), so we're
here to help =)
Cheers,
Guilherme
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Thanks Guilherme, shame on me for not even checking that :)
I will try with 5.4.0-39 and report back. It takes a while for our
workload to run before it starts hitting the issue, but I can give a
somewhat confident answer in an hour or so. By tomorrow I will be very
sure. I'm optimistic.
--
You
Hi Elvis, thanks for you report! I've verified, and this fix is present
on Focal kernel tag "Ubuntu-5.4.0-38.42" - can you give a try with our
proposed kernel (currently it's version 5.4.0-39)?
See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.
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