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From: Pavel Begunkov <[email protected]>
To: Bijan Mottahedeh <[email protected]>, [email protected]
Cc: [email protected]
Subject: Re: [RFC 1/1] io_uring: preserve work->mm since actual work processing may need it
Date: Fri, 10 Apr 2020 20:57:29 +0300	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

On 10/04/2020 20:51, Pavel Begunkov wrote:
>> I added an assert in do_madvise() for a NULL mm value and hit it running the test.
>>
>>> What tree do you use? Extra patches on top?
>>
>> I'm using next-20200409 with no patches.
> 
> I see, it came from 676a179 ("mm: pass task and mm to do_madvise"), which isn't
> in Jen's tree

oops, sorry for mistyping your name.

> 
> I don't think your patch will do, because it changes mm refcounting with extra
> mmdrop() in io_req_work_drop_env(). That's assuming it worked well before.
> 
> Better fix then is to make it ```do_madvise(NULL, current->mm, ...)```
> as it actually was at some point in the mentioned patch (v5). 

Jens, how this should be handled? Through what tree it has to go?

-- 
Pavel Begunkov

  reply	other threads:[~2020-04-10 17:58 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-09 22:03 [RFC 0/1] io_uring: preserve work->mm since actual work processing may need it Bijan Mottahedeh
2020-04-09 22:03 ` [RFC 1/1] " Bijan Mottahedeh
2020-04-10  8:47   ` Pavel Begunkov
2020-04-10 16:54     ` Bijan Mottahedeh
2020-04-10 17:51       ` Pavel Begunkov
2020-04-10 17:57         ` Pavel Begunkov [this message]
2020-04-10 19:09         ` Bijan Mottahedeh
2020-04-11  2:17           ` Jens Axboe
2020-04-16 20:24             ` Minchan Kim
2020-04-16 20:30               ` Jens Axboe

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