just to confirm, works fine with the patch.
Andrej
On 10/7/21 8:09 PM, Cheyenne Wills wrote:
A patch has been submitted for review (https://gerrit.openafs.org/#/c/14826).
The fix itself was simple (2 lines), it just explicitly sets a function for the
set_page_dirty operation to what was being used by default in the older Linux
kernels.
I was able to consistently reproduce the problem by using the iozone
benchmarking tool (iozone -B -a).
Thanks to Andrej Filipcic for reporting the problem, and Michael Laß for
finding the offending Linux 5.14 commit
Cheyenne Wills
[email protected]
________________________________________
From: [email protected] <[email protected]> on behalf of
Cheyenne Wills <[email protected]>
Sent: Wednesday, October 6, 2021 10:19:05 AM
Cc: OpenAFS
Subject: Re: [OpenAFS] kernel 5.14 RIP with openafs 1.8.8
I've started to look at a fix for this.
Thanks for the report
________________________________________
From: [email protected] <[email protected]> on behalf of
Michael Laß <[email protected]>
Sent: Wednesday, October 6, 2021 2:05 AM
To: Mark Vitale; Andrej Filipcic
Cc: OpenAFS
Subject: Re: [OpenAFS] kernel 5.14 RIP with openafs 1.8.8
OK, I might have found the culprit. OpenZFS users were experiencing the
same [1] so I looked at what they had to change to support Linux 5.14.
I noticed this change: https://github.com/openzfs/zfs/pull/12427
It is required due to this upstream change:
https://github.com/torvalds/linux/commit/0af573780b0b13fceb7fabd49dc1b073cee9a507
In fact, filemap_page_mkwrite, which is on the top of the shown call
traces, calls set_page_dirty(page). So if that is an invalid function
pointer, things go wrong.
Best,
Michael
[1]:
https://forum.endeavouros.com/t/null-pointer-dereference-with-kernel-5-14-1/17312
Am Mittwoch, dem 06.10.2021 um 09:49 +0200 schrieb Michael Laß:
[reposting from correct mail address and with small change]
Hi,
it looks like people using Arch Linux get this error as well after
updating to 5.14 [previously I wrote 5.14.9 but the reporter upgraded
from 5.13 so it could be any subversion]. Here is a bug report:
https://bugs.archlinux.org/task/72340
And here is a direct link to the reporter's crash log:
https://bugs.archlinux.org/task/72340?getfile=20754
So the error as well is:
Okt 04 09:18:48 kernel: Code: Unable to access opcode bytes at RIP
0xffffffffffffffd6.
The call trace looks is also basically identical:
Okt 04 09:18:48 kernel: Call Trace:
Okt 04 09:18:48 kernel: filemap_page_mkwrite+0xdf/0x190
Okt 04 09:18:48 kernel: do_page_mkwrite+0x55/0xb0
Okt 04 09:18:48 kernel: do_wp_page+0x22b/0x2d0
Okt 04 09:18:48 kernel: ? cp_new_stat+0x134/0x160
Okt 04 09:18:48 kernel: __handle_mm_fault+0xd45/0x15c0
Okt 04 09:18:48 kernel: handle_mm_fault+0xd5/0x2a0
Okt 04 09:18:48 kernel: do_user_addr_fault+0x1de/0x690
Okt 04 09:18:48 kernel: exc_page_fault+0x72/0x170
Okt 04 09:18:48 kernel: ? asm_exc_page_fault+0x8/0x30
Okt 04 09:18:48 kernel: asm_exc_page_fault+0x1e/0x30
Best,
Michael
Am Montag, dem 04.10.2021 um 14:29 +0000 schrieb Mark Vitale:
Andrej,
On Oct 4, 2021, at 5:47 AM, Andrej Filipcic
<[email protected]>
wrote:
I tried kernel 5.14.9 and openafs 1.8.8. It fails just after login
with
<snip>
any clues or patches?
I consulted with a colleague and we haven't seen a failure like
this.
The backtrace doesn't contain any AFS code either, so no clues
there.
Is it possible your OpenAFS kernel module wasn't rebuilt for this
kernel? (mismatched kernel version)
Regards,
--
Mark Vitale
[email protected]
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--
_____________________________________________________________
prof. dr. Andrej Filipcic, E-mail: [email protected]
Department of Experimental High Energy Physics - F9
Jozef Stefan Institute, Jamova 39, P.o.Box 3000
SI-1001 Ljubljana, Slovenia
Tel.: +386-1-477-3674 Fax: +386-1-477-3166
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