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From: Tejun Heo <tj@kernel.org>
To: Sanan Hasanov <sanan.hasanou@gmail.com>,
	jiangshanlai@gmail.com, linux-kernel@vger.kernel.org
Cc: syzkaller@googlegroups.com, contact@pgazz.com,
	Marcel Holtmann <marcel@holtmann.org>,
	Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
	linux-bluetooth@vger.kernel.org
Subject: Re: WARNING in delayed_work_timer_fn
Date: Mon, 29 Jun 2026 08:51:37 -1000	[thread overview]
Message-ID: <1793c0326127168c468d0e363723f55e@kernel.org> (raw)
In-Reply-To: <6a3eeec7.ade5411d.badf0.e138@mx.google.com>

Hello,

> workqueue: cannot queue hci_conn_timeout on wq hci4
> WARNING: kernel/workqueue.c:2271 at __queue_work+0xd2b/0xff0

conn->disc_work (hci_conn_timeout) is a delayed work item queued on
hdev->workqueue. Its timer expires after the workqueue has started being
torn down, so __queue_work() refuses to queue it and warns.

Arguably this is a shortcoming in workqueue, but as it stands a delayed work
item has to be canceled explicitly before the workqueue it's queued on is
destroyed. disc_work needs to be canceled on the Bluetooth side before
hdev->workqueue is torn down.

Thanks.

--
tejun

      reply	other threads:[~2026-06-29 18:51 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-26 21:27 WARNING in delayed_work_timer_fn sanan.hasanou
2026-06-29 18:51 ` Tejun Heo [this message]

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