From: Al Viro <viro@zeniv.linux.org.uk>
To: Christoph Hellwig <hch@lst.de>
Cc: Amir Goldstein <amir73il@gmail.com>,
syzbot <syzbot+9a5b0ced8b1bfb238b56@syzkaller.appspotmail.com>,
gregkh@linuxfoundation.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com,
tj@kernel.org, valesini@yandex-team.ru,
Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
Miklos Szeredi <miklos@szeredi.hu>
Subject: Re: [syzbot] [kernfs?] possible deadlock in kernfs_fop_llseek
Date: Sat, 6 Apr 2024 04:54:51 +0100 [thread overview]
Message-ID: <20240406035451.GW538574@ZenIV> (raw)
In-Reply-To: <20240405065135.GA3959@lst.de>
On Fri, Apr 05, 2024 at 08:51:35AM +0200, Christoph Hellwig wrote:
> On Thu, Apr 04, 2024 at 12:33:40PM +0300, Amir Goldstein wrote:
> > I don't follow what you are saying.
> > Which code is in non-starter violation?
> > kernfs for calling lookup_bdev() with internal of->mutex held?
>
> That is a huge problem, and has been causing endless annoying lockdep
> chains in the block layer for us. If we have some way to kill this
> the whole block layer would benefit.
Specifically of->mutex or having pathwalk done from some ->write_iter()?
Incidentally, losetup happily accepts sysfs files as backing store.
I don't think it adds problems we don't have otherwise, but IMO
that's really bogus...
next prev parent reply other threads:[~2024-04-06 3:54 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-03 18:23 [syzbot] [kernfs?] possible deadlock in kernfs_fop_llseek syzbot
2024-04-03 23:51 ` syzbot
2024-04-04 6:54 ` Amir Goldstein
2024-04-04 8:11 ` Al Viro
2024-04-04 8:21 ` Al Viro
2024-04-04 8:40 ` Al Viro
2024-04-04 9:33 ` Amir Goldstein
2024-04-04 22:01 ` Al Viro
2024-04-05 10:34 ` Amir Goldstein
2024-04-05 6:51 ` Christoph Hellwig
2024-04-05 11:19 ` Christian Brauner
2024-04-05 13:48 ` Christian Brauner
2024-04-05 14:52 ` Christoph Hellwig
2024-04-05 15:41 ` Tejun Heo
2024-04-06 3:54 ` Al Viro [this message]
2024-04-05 10:47 ` Christian Brauner
2024-04-05 14:48 ` Amir Goldstein
2024-04-06 4:09 ` Al Viro
2024-04-06 5:25 ` Amir Goldstein
2024-04-05 15:08 ` Amir Goldstein
2024-04-05 15:37 ` syzbot
2024-04-05 16:23 ` Al Viro
2024-04-06 5:34 ` Amir Goldstein
2024-04-06 7:05 ` syzbot
2024-04-06 7:11 ` Al Viro
2024-04-06 8:57 ` Amir Goldstein
2024-04-07 0:50 ` Al Viro
2024-04-07 11:02 ` Amir Goldstein
2024-04-09 9:18 ` Christian Brauner
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