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From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>, [email protected]
Subject: [RFC 0/2] fix in-kernel segfault
Date: Sun, 24 Nov 2019 01:49:42 +0300	[thread overview]
Message-ID: <[email protected]> (raw)

There is a bug hunging my system when run fixed-link with /dev/urandom
instead of /dev/zero (see patch 1/2).

As for me, the easiest way to fix is to grab mm and use userspace
address for this specific case (as it's done in patches). The other
way is to kmap/vmap, but the first should be short-lived and the
second needs mm anyway.

Ideas how to do it better way? Suggestions and corrections are welcome.

P.S. It seems for some reason it fails a bunch of unrelated tests,
that's POC and not meant to be applied yet.


Pavel Begunkov (2):
  io_uring: fix dead-hung for non-iter fixed rw
  io_uring: fix linked fixed !iter rw

 fs/io_uring.c | 95 ++++++++++++++++++++++++++++++++-------------------
 1 file changed, 60 insertions(+), 35 deletions(-)

-- 
2.24.0


             reply	other threads:[~2019-11-23 22:50 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-23 22:49 Pavel Begunkov [this message]
2019-11-23 22:49 ` [PATCH 1/2] io_uring: fix dead-hung for non-iter fixed rw Pavel Begunkov
2019-11-23 22:49 ` [PATCH 2/2] io_uring: fix linked fixed !iter rw Pavel Begunkov
2019-11-23 22:53 ` [RFC 0/2] fix in-kernel segfault Jens Axboe
2019-11-23 23:08 ` Jens Axboe
2019-11-24  8:57   ` Pavel Begunkov
2019-11-24 16:36     ` Jens Axboe

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