linux-kernel - shmem_rename() bugs (was Re: 6.19 tmpfs __d

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Message-ID: <20251214032734.GL1712166@ZenIV>
Date: Sun, 14 Dec 2025 03:27:34 +0000
From: Al Viro <viro@...iv.linux.org.uk>
To: Hugh Dickins <hughd@...gle.com>
Cc: Miklos Szeredi <miklos@...redi.hu>,
	Christian Brauner <brauner@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Linus Torvalds <torvalds@...ux-foundation.org>,
	Chuck Lever <chuck.lever@...cle.com>
Subject: shmem_rename() bugs (was Re: 6.19 tmpfs __d_lookup() lockup)

On Sat, Dec 13, 2025 at 07:22:41AM +0000, Al Viro wrote:

> 	What I'm going to do is a couple of patches - one fixing
> the regression in this cycle (pretty much what you'd been testing),
> then a separate fix for stable offsets failure handling (present
> since 2023).  I'll feed them to Linus; I hoped to do that with
> old regression fixed first, to reduce the PITA for backports,
> but if I don't have that debugged tomorrow, I'll send the recent
> regression fix first.

OK, I think I've got it; see

git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git #fixes

individual patches in followups; the first one deals with this cycle
regression, the second - with older bug in shmem_rename() failure
exits.

Folks, please review.  If nobody objects, I'll send a pull request on
Monday.