linux-kernel - Re: [BUG] WARNING: at fs/sysfs/dir.c:455 sysfs_add

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Message-ID: <s5hipvsnumx.wl%tiwai@suse.de>
Date:	Wed, 09 Mar 2011 17:09:10 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Greg KH <gregkh@...e.de>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	alsa-devel@...a-project.org
Subject: Re: [BUG] WARNING: at fs/sysfs/dir.c:455 sysfs_add_one+0x83/0x95

At Wed, 9 Mar 2011 07:53:09 -0800,
Greg KH wrote:
> 
> On Wed, Mar 09, 2011 at 10:39:49AM -0500, Steven Rostedt wrote:
> > Not sure who to send this to, but last night on v2.6.38-rc8 ktest
> > triggered this warning:
> > 
> > 
> > [   32.062538] YM3812 and OPL-3 driver Copyright (C) by Hannu Savolainen, Rob Hooft 1993-1996
> > [   32.071305] PM: Adding info for No Bus:timer
> > [   32.075864] PM: Adding info for platform:snd_dummy.0^M
> > [   32.081232] PM: Adding info for No Bus:card0
> > [   32.085853] PM: Adding info for No Bus:pcmC0D0p
> > [   32.090650] PM: Adding info for No Bus:pcmC0D0c
> > [   32.095667] PM: Adding info for No Bus:dsp
> > [   32.099918] ------------[ cut here ]------------
> > [   32.104531] WARNING: at /home/rostedt/work/autotest/nobackup/linux-test.git/fs/sysfs/dir.c:455 sysfs_add_one+0x83/0x95()
> > [   32.115379] Hardware name:         
> > [   32.118859] sysfs: cannot create duplicate filename '/dev/char/14:4'
> 
> Two modules wanted to create the same minor number, that's not good.
> 
> 14:4 is the OSS /dev/audio node.

Are they modules or built-in?

> > [   32.125197] Modules linked in:
> > [   32.128255] Pid: 1, comm: swapper Not tainted 2.6.38-rc8-test #1
> > [   32.134247] Call Trace:^M
> > [   32.136693]  [<c044d095>] ? warn_slowpath_common+0x7c/0x91
> > [   32.142168]  [<c0552d35>] ? sysfs_add_one+0x83/0x95
> > [   32.147036]  [<c0552d35>] ? sysfs_add_one+0x83/0x95
> > [   32.151904]  [<c044d135>] ? warn_slowpath_fmt+0x33/0x35
> > [   32.157120]  [<c0552d35>] ? sysfs_add_one+0x83/0x95
> > [   32.161989]  [<c055393d>] ? sysfs_do_create_link+0xdf/0x181^M
> > [   32.167550]  [<c073637f>] ? vsnprintf+0x22c/0x266
> > [   32.172246]  [<c0553a0f>] ? sysfs_create_link+0x17/0x1c
> > [   32.177462]  [<c0950ce4>] ? device_add+0x183/0x573
> > [   32.182245]  [<c0958474>] ? device_pm_init+0x5d/0x61
> > [   32.187200]  [<c09510eb>] ? device_register+0x17/0x1a
> > [   32.192243]  [<c0951165>] ? device_create_vargs+0x77/0x98
> > [   32.197631]  [<c09511b3>] ? device_create+0x2d/0x2f
> > [   32.202501]  [<c0dc5caa>] ? sound_insert_unit+0x1ba/0x1d5
> > [   32.207891]  [<c0dc5e8e>] ? register_sound_special_device+0x103/0x11c
> > [   32.214319]  [<c0dd7875>] ? snd_register_oss_device+0x10a/0x169
> > [   32.220229]  [<c0de6cd6>] ? register_oss_dsp+0x62/0xb5
> 
> Yup, sound subsystem...

Yep ;)

> > This was for a 386 build. I could give a .config and full dmesg if
> > needed.
> 
> I think the sound developers (now on CC: would probably like to see
> that.)

I guess it's a long-standing issue.  The dead old OSS driver creates
/dev/audio and /dev/dspW by itself without coping with sound_core
module.


Takashi
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