From: Jeff Layton <jlayton@kernel.org>
To: Desmond Cheong Zhi Xi <desmondcheongzx@gmail.com>,
bfields@fieldses.org, viro@zeniv.linux.org.uk
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
skhan@linuxfoundation.org, gregkh@linuxfoundation.org,
linux-kernel-mentees@lists.linuxfoundation.org
Subject: Re: [PATCH v3 0/2] fcntl: fix potential deadlocks
Date: Wed, 07 Jul 2021 13:06:07 -0400 [thread overview]
Message-ID: <15fbc55a3b983c4962e9ad2d96eeebd77aad3be6.camel@kernel.org> (raw)
In-Reply-To: <20210707074401.447952-1-desmondcheongzx@gmail.com>
On Wed, 2021-07-07 at 15:43 +0800, Desmond Cheong Zhi Xi wrote:
> Hi,
>
> Sorry for the delay between v1 and v2, there was an unrelated issue with Syzbot testing.
>
> Syzbot reports a possible irq lock inversion dependency:
> https://syzkaller.appspot.com/bug?id=923cfc6c6348963f99886a0176ef11dcc429547b
>
> While investigating this error, I discovered that multiple similar lock inversion scenarios can occur. Hence, this series addresses potential deadlocks for two classes of locks, one in each patch:
>
> 1. Fix potential deadlocks for &fown_struct.lock
>
> 2. Fix potential deadlock for &fasync_struct.fa_lock
>
> v2 -> v3:
> - Removed WARN_ON_ONCE, keeping elaboration for why read_lock_irq is safe to use in the commit message. As suggested by Greg KH.
>
> v1 -> v2:
> - Added WARN_ON_ONCE(irqs_disabled()) before calls to read_lock_irq, and added elaboration in the commit message. As suggested by Jeff Layton.
>
> Best wishes,
> Desmond
>
> Desmond Cheong Zhi Xi (2):
> fcntl: fix potential deadlocks for &fown_struct.lock
> fcntl: fix potential deadlock for &fasync_struct.fa_lock
>
> fs/fcntl.c | 18 ++++++++++--------
> 1 file changed, 10 insertions(+), 8 deletions(-)
>
Looks like these patches are identical to the v1 set, so I'm just going
to leave those in place since linux-next already has them. Let me know
if I've missed something though.
Thanks!
--
Jeff Layton <jlayton@kernel.org>
next prev parent reply other threads:[~2021-07-07 17:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-07 7:43 [PATCH v3 0/2] fcntl: fix potential deadlocks Desmond Cheong Zhi Xi
2021-07-07 7:44 ` [PATCH v3 1/2] fcntl: fix potential deadlocks for &fown_struct.lock Desmond Cheong Zhi Xi
2021-07-07 7:44 ` [PATCH v3 2/2] fcntl: fix potential deadlock for &fasync_struct.fa_lock Desmond Cheong Zhi Xi
2021-07-07 17:06 ` Jeff Layton [this message]
2021-07-08 1:52 ` [PATCH v3 0/2] fcntl: fix potential deadlocks Desmond Cheong Zhi Xi
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 \
--in-reply-to=15fbc55a3b983c4962e9ad2d96eeebd77aad3be6.camel@kernel.org \
--to=jlayton@kernel.org \
--cc=bfields@fieldses.org \
--cc=desmondcheongzx@gmail.com \
--cc=gregkh@linuxfoundation.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel-mentees@lists.linuxfoundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=skhan@linuxfoundation.org \
--cc=viro@zeniv.linux.org.uk \
/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;
as well as URLs for NNTP newsgroup(s).