Bug#996951: linux-image-5.14.0-3-amd64: iouring looses requests

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From	Diederik de Haas <didi.debian@cknow.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#996951: linux-image-5.14.0-3-amd64: iouring looses requests
Date	Thu, 21 Oct 2021 13:20:01 +0200
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X-Original-To	Daniel Black <daniel@mariadb.org>, 996951@bugs.debian.org
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X-Original-Cc	Salvatore Bonaccorso <carnil@debian.org>
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On Thursday, 21 October 2021 12:41:34 CEST Salvatore Bonaccorso wrote:
> On Thu, Oct 21, 2021 at 09:38:00AM +0000, Daniel Black wrote:
> > Package: src:linux
> > Version: 5.14.12-1
> > The good news is I've validated that the linux mainline 5.14.14 build
> > from https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.14.14/ has
> > actually fixed this problem.
> 
> Where you able to isolate the upstream change landed upstream which
> fixes the issue?

There has been 1 change in fs/io_uring.c that is part of 5.14.14 (and 5.14.13),
but not 5.14.12 and that is this commit:
e798dcd960a3f0d40302a1bbf7f755879195a163 "io_uring: kill fasync"

Possibly the simplest way to verify whether it's indeed that commit that fixes
the issue is to apply the patch to Debian's 5.14.12 kernel. 
Instructions here (also follow 4.2.1):
https://kernel-team.pages.debian.net/kernel-handbook/ch-common-tasks.html#s4.2.2

This would narrow it down to this specific commit and would also rule out
differences in Ubuntu's kernel config and Debian's.

Cheers,
  Diederik

Thread

Bug#996951: linux-image-5.14.0-3-amd64: iouring looses requests Daniel Black <daniel@mariadb.org> - 2021-10-21 11:50 +0200
  Bug#996951: linux-image-5.14.0-3-amd64: iouring looses requests Salvatore Bonaccorso <carnil@debian.org> - 2021-10-21 12:50 +0200
    Bug#996951: linux-image-5.14.0-3-amd64: iouring looses requests Diederik de Haas <didi.debian@cknow.org> - 2021-10-21 13:20 +0200
      Bug#996951: linux-image-5.14.0-3-amd64: iouring looses requests Daniel Black <daniel@mariadb.org> - 2021-10-21 14:10 +0200
  Processed: Re: Bug#996951: linux-image-5.14.0-3-amd64: iouring  looses requests "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-10-21 12:50 +0200
  Processed: Re: Bug#996951: linux-image-5.14.0-3-amd64: iouring  looses requests "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-10-23 09:40 +0200
  Bug#996951: linux-image-5.14.0-3-amd64: iouring looses requests Diederik de Haas <didi.debian@cknow.org> - 2021-10-24 00:40 +0200
  Processed: Re: Bug#996951: linux-image-5.14.0-3-amd64: iouring  looses requests "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-10-24 00:40 +0200
  Bug#996951:  Daniel Black <daniel@mariadb.org> - 2021-11-07 23:50 +0100
  Bug#996951: marked as done (linux-image-5.14.0-3-amd64: iouring  looses requests) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-11-15 11:10 +0100

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