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

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Date:   Tue, 24 Mar 2020 10:08:38 +0100
From:   Oliver Neukum <oneukum@...e.de>
To:     Qais Yousef <qais.yousef@....com>
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

Am Montag, den 23.03.2020, 17:29 +0000 schrieb Qais Yousef:
> Hi Oliver

Hi,

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

I am afraid not.

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

Overkill but correct. +mpf would be even better

> 	$REPRODUCE

Good

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

No.

/sys/kernel/debug/dynamic_debug/control holds the collection of the
messages that may be triggered, but it does not tell you which messages
are triggered and in which order. The triggered messages end up
in syslog. So you would use 'dmesg'
I am afraid you redid the test correctly and then threw away the
result.
Could you redo it and just attach the output of dmesg?

	Sorry
		Oliver