linux-kernel - Re: [PATCH] fs/netfs/read_collect: add to next->prev

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Message-ID: <CAKPOu+_WAM3RQJnHsKfEh5sG5tBuCPt1EWtoUFVC2ma=ORjHkg@mail.gmail.com>
Date: Sat, 1 Mar 2025 17:51:22 +0100
From: Max Kellermann <max.kellermann@...os.com>
To: Salvatore Bonaccorso <carnil@...ian.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, David Howells <dhowells@...hat.com>, 
	netfs@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	linux-nfs@...r.kernel.org
Subject: Re: [PATCH] fs/netfs/read_collect: add to next->prev_donated

On Sat, Mar 1, 2025 at 3:17 PM Salvatore Bonaccorso <carnil@...ian.org> wrote:
> Do I see it correctly that this will be 6.12.y and 6.13.y specific
> backports since the code in mainline changed substantially with
> e2d46f2ec332 ("netfs: Change the read result collector to only use one
> work item") and so your change does not apply there anymore?

Correct.

> I'm asking since we got a bug report in Debian which seems to idicate
> it might have the same root cause as you report, and it is at
> https://bugs.debian.org/1098698 .

This indeed looks similar.

Note that this is one of four netfs crash fixes I posted recently.
Two other fixes have been released with 6.13.4 already:
https://lore.kernel.org/netfs/20250211093432.3524035-1-max.kellermann@ionos.com/
https://lore.kernel.org/netfs/20250210223144.3481766-1-max.kellermann@ionos.com/
The fourth bug (that got no reviews so far) is here (this one affects
master as well):
https://lore.kernel.org/netfs/20250228123602.2140459-1-max.kellermann@ionos.com/

Max