Bug 33792

Summary:	lockdep trace when unplugging usb audio (.39rc4)
Product:	Drivers	Reporter:	Maciej Rutecki (maciej.rutecki)
Component:	Sound(ALSA)	Assignee:	Jaroslav Kysela (perex)
Status:	RESOLVED CODE_FIX
Severity:	normal	CC:	james, maciej.rutecki, rjw, tiwai
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.39-rc4	Subsystem:
Regression:	Yes	Bisected commit-id:
Bug Depends on:
Bug Blocks:	27352

Description Maciej Rutecki 2011-04-21 17:30:43 UTC

Subject    : lockdep trace when unplugging usb audio (.39rc4)
Submitter  : Dave Jones <davej@redhat.com>
Date       : 2011-04-19 18:07
Message-ID : 20110419180745.GA438@redhat.com
References : http://marc.info/?l=linux-kernel&m=130323648920431&w=2

This entry is being used for tracking a regression from 2.6.38. Please don't
close it until the problem is fixed in the mainline.

Comment 1 James Hogan 2011-05-12 21:46:36 UTC

I see this when suspending my laptop in 2.6.39-rc7. I've seen these warnings since 2.6.39-rc2 (didn't try rc1), although I can't remember if exactly the same warning. Don't see any warnings in 2.6.38.

Is it worth me spending the time to try and bisect it, or is the problem obvious from the log?

Comment 2 James Hogan 2011-05-15 07:04:06 UTC

I just saw this exact same circular locking warning on v2.6.38

Comment 3 Rafael J. Wysocki 2011-05-15 09:16:25 UTC

OK, suppose it's a post-2.6.37 regression.

Comment 4 Takashi Iwai 2013-11-13 17:31:36 UTC

The race must have been already fixed in the upstream.