linux-kernel - Re: [PATCH] btrfs: qgroup: add missing extent changeset release

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Message-ID: <20240827160341.GZ25962@suse.cz>
Date: Tue, 27 Aug 2024 18:03:41 +0200
From: David Sterba <dsterba@...e.cz>
To: Fedor Pchelkin <pchelkin@...ras.ru>
Cc: David Sterba <dsterba@...e.com>, Chris Mason <clm@...com>,
	Josef Bacik <josef@...icpanda.com>, Boris Burkov <boris@....io>,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org,
	syzbot+81670362c283f3dd889c@...kaller.appspotmail.com,
	stable@...r.kernel.org
Subject: Re: [PATCH] btrfs: qgroup: add missing extent changeset release

On Tue, Aug 27, 2024 at 06:12:43PM +0300, Fedor Pchelkin wrote:
> The extent changeset may have some additional memory dynamically allocated
> for ulist in result of clear_record_extent_bits() execution.

This can happen, as clear_record_extent_bits adds more data to the
changeset in some cases. What I don't see yet how it happens. An extent
range must be split so that a new entry is added with different bits
set. This is usual thing, but why does this happen with the quotas
disabled.