linux-kernel - Re: [PATCH v3] netfs, 9p: Fix race between umount and async request completion

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Date: Mon, 27 May 2024 13:09:00 +0200
From: Christian Brauner <brauner@...nel.org>
To: David Howells <dhowells@...hat.com>
Cc: Christian Brauner <brauner@...nel.org>,
	syzbot+df038d463cca332e8414@...kaller.appspotmail.com,
	syzbot+d7c7a495a5e466c031b6@...kaller.appspotmail.com,
	syzbot+1527696d41a634cc1819@...kaller.appspotmail.com,
	Eric Van Hensbergen <ericvh@...nel.org>,
	Latchesar Ionkov <lucho@...kov.net>,
	Christian Schoenebeck <linux_oss@...debyte.com>,
	Jeff Layton <jlayton@...nel.org>,
	Steve French <sfrench@...ba.org>,
	Hillf Danton <hdanton@...a.com>,
	v9fs@...ts.linux.dev,
	linux-afs@...ts.infradead.org,
	linux-cifs@...r.kernel.org,
	netfs@...ts.linux.dev,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Dominique Martinet <asmadeus@...ewreck.org>
Subject: Re: [PATCH v3] netfs, 9p: Fix race between umount and async request completion

On Fri, 24 May 2024 15:26:11 +0100, David Howells wrote:
> netfs, 9p: Fix race between umount and async request completion
> 
> There's a problem in 9p's interaction with netfslib whereby a crash occurs
> because the 9p_fid structs get forcibly destroyed during client teardown
> (without paying attention to their refcounts) before netfslib has finished
> with them.  However, it's not a simple case of deferring the clunking that
> p9_fid_put() does as that requires the p9_client record to still be
> present.
> 
> [...]

Applied to the vfs.fixes branch of the vfs/vfs.git tree.
Patches in the vfs.fixes branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.fixes

[1/1] netfs, 9p: Fix race between umount and async request completion
      https://git.kernel.org/vfs/vfs/c/e20fe12bfb0b