From: Jens Axboe <[email protected]>
To: Olivier Langlois <[email protected]>,
Linus Torvalds <[email protected]>
Cc: Stefan Metzmacher <[email protected]>,
Thomas Gleixner <[email protected]>,
Andy Lutomirski <[email protected]>,
Linux Kernel Mailing List <[email protected]>,
io-uring <[email protected]>,
the arch/x86 maintainers <[email protected]>
Subject: Re: [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io_threads
Date: Tue, 25 May 2021 13:52:24 -0600 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On 5/25/21 1:39 PM, Olivier Langlois wrote:
> On Fri, 2021-05-21 at 03:31 -0400, Olivier Langlois wrote:
>>
>> However, I can reproduce it at will with my real program. So as Linus
>> has suggested, I'll investigate by searching where the PF_IO_WORKER is
>> used.
>>
>> I'll keep the list updated if I discover something.
>>
> I think that I am about to stumble into the key to unravel the mystery
> of my core dump generation issue. I am going ask you a quick question
> and it is very likely to trigger an ahah moment...
>
> To what value is the task_struct mm field is set to for the io-wkr
> threads?
>
> If I look in the create_io_thread() function, I can see that CLONE_VM
> isn't set...
It definitely should be, what kernel are you looking at? If CLONE_VM
wasn't set, we'd have various issues with requests accessing user mm.
--
Jens Axboe
next prev parent reply other threads:[~2021-05-25 19:52 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <[email protected]>
2021-05-03 16:05 ` [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io_threads Andy Lutomirski
2021-05-03 19:14 ` Linus Torvalds
2021-05-03 20:15 ` Andy Lutomirski
2021-05-03 20:21 ` Andy Lutomirski
2021-05-03 20:37 ` Linus Torvalds
2021-05-03 21:26 ` Jens Axboe
2021-05-03 21:49 ` Andy Lutomirski
2021-05-03 22:08 ` Linus Torvalds
2021-05-03 22:56 ` Thomas Gleixner
2021-05-03 23:15 ` Andy Lutomirski
2021-05-03 23:16 ` Linus Torvalds
2021-05-03 23:19 ` Linus Torvalds
2021-05-03 23:27 ` Stefan Metzmacher
2021-05-03 23:48 ` Linus Torvalds
2021-05-04 2:50 ` Jens Axboe
2021-05-04 11:39 ` Stefan Metzmacher
2021-05-04 15:53 ` Linus Torvalds
2021-05-12 4:24 ` Olivier Langlois
2021-05-12 17:44 ` Linus Torvalds
2021-05-12 20:55 ` Jens Axboe
2021-05-20 4:13 ` Olivier Langlois
2021-05-21 7:31 ` Olivier Langlois
2021-05-25 19:39 ` Olivier Langlois
2021-05-25 19:45 ` Olivier Langlois
2021-05-25 19:52 ` Jens Axboe [this message]
2021-05-25 20:23 ` Linus Torvalds
2021-05-04 8:22 ` David Laight
2021-05-04 0:01 ` Andy Lutomirski
2021-05-04 8:39 ` Peter Zijlstra
2021-05-04 15:35 ` Borislav Petkov
2021-05-04 15:55 ` Simon Marchi
2021-05-05 11:29 ` Stefan Metzmacher
2021-05-05 21:59 ` Simon Marchi
2021-05-05 22:11 ` Andy Lutomirski
2021-05-05 23:12 ` Borislav Petkov
2021-05-05 23:22 ` Andy Lutomirski
2021-05-06 1:04 ` Simon Marchi
2021-05-06 15:11 ` Andy Lutomirski
2021-05-06 9:47 ` David Laight
2021-05-06 9:53 ` David Laight
2021-05-05 22:21 ` Stefan Metzmacher
2021-05-05 23:15 ` Simon Marchi
2021-04-11 15:27 Stefan Metzmacher
2021-04-14 21:28 ` Stefan Metzmacher
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox