Re: [BUG] WARNING: at fs/sysfs/dir.c:455 sysfs_add_one+0x83/0x95

[Greg KH <gregkh@suse.de>]

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.

> [   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...


> [   32.225358]  [<c046b95c>] ? sched_clock_cpu+0x16a/0x17a
> [   32.230575]  [<c04778f2>] ? mark_held_locks+0x43/0x5b
> [   32.235616]  [<c0fa124c>] ? __mutex_lock_common+0x39f/0x3c7
> [   32.241177]  [<c04776d2>] ? mark_lock+0x1e/0x1fb
> [   32.245787]  [<c04778f2>] ? mark_held_locks+0x43/0x5b
> [   32.250838]  [<c0fa0cff>] ? __mutex_unlock_slowpath+0x137/0x153
> [   32.256745]  [<c0de6d69>] ? snd_pcm_oss_register_minor+0x40/0xe3
> [   32.262737]  [<c0fa0d28>] ? mutex_unlock+0xd/0xf
> [   32.267345]  [<c0dd96b7>] ? snd_timer_dev_register+0x10d/0x117
> [   32.273165]  [<c0dd6db9>] ? snd_device_register+0x67/0xd2
> [   32.278551]  [<c07363d5>] ? sprintf+0x1c/0x1e^M
> [   32.282900]  [<c0de2db7>] ? snd_pcm_timer_init+0xba/0xef
> [   32.288201]  [<c0ddb426>] ? snd_pcm_dev_register+0x1e8/0x224
> [   32.293848]  [<c0951000>] ? device_add+0x49f/0x573
> [   32.298630]  [<c0dd6d32>] ? snd_device_register_all+0x5e/0x7e
> [   32.304363]  [<c09511b3>] ? device_create+0x2d/0x2f
> [   32.309230]  [<c0dd32d3>] ? snd_card_register+0x92/0x1af
> [   32.314531]  [<c0f87b9b>] ? snd_dummy_probe+0x322/0x3b2
> [   32.319745]  [<c0953f57>] ? platform_drv_probe+0x14/0x16
> [   32.325046]  [<c0953154>] ? driver_probe_device+0x116/0x1ed
> [   32.330606]  [<c073b414>] ? do_raw_spin_unlock+0x8f/0x94
> [   32.335906]  [<c09532c5>] ? __device_attach+0x2f/0x33^M
> [   32.340946]  [<c09524ab>] ? bus_for_each_drv+0x44/0x6e
> [   32.346073]  [<c095334e>] ? device_attach+0x61/0x7e^M
> [   32.350941]  [<c0953296>] ? __device_attach+0x0/0x33
> [   32.355895]  [<c09522e8>] ? bus_probe_device+0x23/0x38
> [   32.361023]  [<c0950f61>] ? device_add+0x400/0x573
> [   32.365805]  [<c0730ac4>] ? kobject_set_name_vargs+0x46/0x4c
> [   32.371453]  [<c0954624>] ? platform_device_add+0x139/0x182
> [   32.377015]  [<c095487d>] ? platform_device_register_resndata+0x4f/0x65
> [   32.383616]  [<c17e2210>] ? alsa_card_dummy_init+0xcc/0x121
> [   32.389177]  [<c0403096>] ? do_one_initcall+0x8c/0x161
> [   32.394305]  [<c17e2144>] ? alsa_card_dummy_init+0x0/0x121
> [   32.399780]  [<c17843cf>] ? kernel_init+0x12c/0x1c2
> [   32.404646]  [<c17842a3>] ? kernel_init+0x0/0x1c2
> [   32.409340]  [<c040a8c2>] ? kernel_thread_helper+0x6/0x10
> [   32.414782] ---[ end trace 5d9e7ab86ca08fa1 ]---
> [   32.419772] PM: Adding info for No Bus:controlC0
> [   32.424867] PM: Adding info for isa:es18xx.0
> [   32.429167] PM: Removing info for isa:es18xx.0
> 
> 
> 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.)

thanks,

greg k-h