linux-kernel - Re: lockdep warning in urb.c:363 usb_submit

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Date:   Mon, 23 Mar 2020 17:29:34 +0000
From:   Qais Yousef <qais.yousef@....com>
To:     Oliver Neukum <oneukum@...e.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: lockdep warning in urb.c:363 usb_submit_urb

Hi Oliver

On 03/23/20 16:36, Oliver Neukum wrote:
> Am Montag, den 23.03.2020, 14:38 +0000 schrieb Qais Yousef:
> > Hi
> > 
> > I've hit the following lockdep warning when I trigger hibernate on arm64
> > platform (Juno-r2)
> > 
> > 
> > 	echo suspend > /sys/power/disk
> > 	echo disk > /sys/power/state
> > 
> > I only had a usb flash drive attached to it. Let me know if you need more info.
> 
> Hi,
> 
> that is not a lockdep issue, but the hub driver is not properly killing
> its URB presumably. Yet, the driver looks correct to me. Please use
> the additional patch and activate dynamic debugging for usbcore.

First time I use dynamic debugging, hopefully I've done correctly.


	echo "file drivers/usb/* +p" > /sys/kernel/debug/dynamic_debug/control

	$REPRODUCE

	cat /sys/kernel/debug/dynamic_debug/control | grep usb > usb.debug

usb.debug is attached.

Thanks

--
Qais Yousef

View attachment "usb.debug" of type "text/plain" (146872 bytes)