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
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