linux-kernel - Re: [PATCH] block: Fix page refcounts for unaligned buffers in __bio_release

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Message-ID: <20240229225630.GA460680@bobdog.home.arpa>
Date: Thu, 29 Feb 2024 15:56:30 -0700
From: Greg Edwards <gedwards@....com>
To: Tony Battersby <tonyb@...ernetics.com>
Cc: Jens Axboe <axboe@...nel.dk>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>, Hannes Reinecke <hare@...e.de>,
	Keith Busch <kbusch@...nel.org>, linux-mm <linux-mm@...ck.org>,
	linux-block@...r.kernel.org,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] block: Fix page refcounts for unaligned buffers in
 __bio_release_pages()

On Thu, Feb 29, 2024 at 01:08:09PM -0500, Tony Battersby wrote:
> Fix an incorrect number of pages being released for buffers that do not
> start at the beginning of a page.
>
> Fixes: 1b151e2435fc ("block: Remove special-casing of compound pages")
> Cc: stable@...r.kernel.org
> Signed-off-by: Tony Battersby <tonyb@...ernetics.com>
> ---

This resolves the QEMU hugetlb issue I noted earlier today here [1].
I tested it on 6.1.79, 6.8-rc6 and linux-next-20240229.  Thank you!

Feel free to add a:

Tested-by: Greg Edwards <gedwards@....com>

[1] https://lore.kernel.org/linux-block/20240229182513.GA17355@bobdog.home.arpa/