From: Paulo Alcantara <pc@cjr.nz>
To: Shyam Prasad N <nspmangalore@gmail.com>,
CIFS <linux-cifs@vger.kernel.org>,
Enzo Matsumiya <ematsumiya@suse.de>
Subject: Re: Deadlock in Ubuntu 5.4 kernel
Date: Thu, 29 Dec 2022 09:16:54 -0300 [thread overview]
Message-ID: <87a6364d6x.fsf@cjr.nz> (raw)
In-Reply-To: <CANT5p=qEwppcgZvbdLaABb6M-pRxyDQ05oHOb523n34tYyDqcw@mail.gmail.com>
Shyam Prasad N <nspmangalore@gmail.com> writes:
> A customer reported this deadlock in a Kubernetes setup running on Ubuntu-18.04.
> This must be a 5.4 kernel, running this code:
> https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-azure/+git/bionic
>
> Based on the stack, it appears to be a hang in DFS reconnect codepath,
> trying to access the DFS cache lock in dfs_cache_update_vol.
>
> Can you tell if this is a known issue that has been fixed since?
Looks like this has been fixed by
06d57378bcc9 ("cifs: Fix potential deadlock when updating vol in cifs_reconnect()")
> And if Ubuntu should backport any fix to 5.4?
I would say so. It would probably also require others dfs related
patches to be backported in addition to the above.
> I could not find the function in the mainline codebase.
Yes, it has changed alot.
next prev parent reply other threads:[~2022-12-29 12:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-29 3:26 Deadlock in Ubuntu 5.4 kernel Shyam Prasad N
2022-12-29 12:16 ` Paulo Alcantara [this message]
2022-12-30 3:33 ` Shyam Prasad N
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=87a6364d6x.fsf@cjr.nz \
--to=pc@cjr.nz \
--cc=ematsumiya@suse.de \
--cc=linux-cifs@vger.kernel.org \
--cc=nspmangalore@gmail.com \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.