[alsa-devel] [snd_msnd_init] WARNING: CPU: 0 PID: 1 at fs/sysfs/dir.c:486 sysfs_warn_dup+0x7d/0xa0()

[Takashi Iwai]

At Tue, 12 Nov 2013 16:35:36 +0800,
Fengguang Wu wrote:
> 
> On Tue, Nov 12, 2013 at 09:14:49AM +0100, Takashi Iwai wrote:
> > At Tue, 12 Nov 2013 08:11:04 +0800,
> > Fengguang Wu wrote:
> > > 
> > > Greetings,
> > > 
> > > I got this warning when booting a kernel with the attached kconfig.
> > > 
> > > [    5.073253] kobject: 'msnd-pinnacle.7' (cec33408): kobject_release, parent   (null) (delayed)
> > > [    5.074347] kobject: 'msnd-pinnacle' (cecd4980): kobject_release, parent cf3ad9b0 (delayed)
> > > [    5.075576] ------------[ cut here ]------------
> > > [    5.076200] WARNING: CPU: 0 PID: 1 at fs/sysfs/dir.c:486 sysfs_warn_dup+0x7d/0xa0()
> > > [    5.077434] sysfs: cannot create duplicate filename '/bus/isa/drivers/msnd-pinnacle'
> > > [    5.078422] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.12.0-wl-05537-gf1c1073 #242
> > > [    5.079529] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
> > > [    5.080418]  00000000 00000000 cb857d74 c17a4989 cb857db4 cb857da4 c10944ba c1a23264
> > > [    5.081680]  cb857dd0 00000001 c1a231f8 000001e6 c11c051d c11c051d c0025000 000001e6
> > > [    5.083104]  c0025000 cb857dbc c109452e 00000009 cb857db4 c1a23264 cb857dd0 cb857de0
> > > [    5.084361] Call Trace:
> > > [    5.084745]  [<c17a4989>] dump_stack+0x4b/0x98
> > > [    5.085463]  [<c10944ba>] warn_slowpath_common+0x7a/0xa0
> > > [    5.086182]  [<c11c051d>] ? sysfs_warn_dup+0x7d/0xa0
> > > [    5.086785]  [<c11c051d>] ? sysfs_warn_dup+0x7d/0xa0
> > > [    5.087397]  [<c109452e>] warn_slowpath_fmt+0x2e/0x30
> > > [    5.087980]  [<c11c051d>] sysfs_warn_dup+0x7d/0xa0
> > > [    5.088621]  [<c11c0569>] sysfs_add_one+0x29/0x40
> > > [    5.089230]  [<c11c0648>] create_dir+0x58/0xa0
> > > [    5.089797]  [<c11c0a1d>] sysfs_create_dir_ns+0xfd/0x120
> > > [    5.090709]  [<c12343c2>] kobject_add_internal+0xc2/0x240
> > > [    5.091505]  [<c1179fbb>] ? kfree+0x7b/0x210
> > > [    5.092211]  [<c1233fc2>] ? kobject_set_name_vargs+0x42/0x60
> > > [    5.092978]  [<c123458d>] kobject_init_and_add+0x4d/0x60
> > > [    5.093706]  [<c13e108a>] bus_add_driver+0x7a/0x200
> > > [    5.094351]  [<c1c1c729>] ? snd_msnd_init+0x49/0x49
> > > [    5.095085]  [<c13ebbb0>] ? isa_bus_remove+0x30/0x30
> > > [    5.095817]  [<c1c1c729>] ? snd_msnd_init+0x49/0x49
> > > [    5.096521]  [<c13e285f>] driver_register+0xaf/0xf0
> > > [    5.097136]  [<c10c4492>] ? preempt_count_sub+0xf2/0x150
> > > [    5.097795]  [<c13ebca6>] isa_register_driver+0x26/0x160
> > > [    5.098534]  [<c1c1c6e0>] ? alsa_card_gusextreme_init+0x14/0x14
> > > [    5.099423]  [<c17b3f20>] ? _raw_spin_unlock+0x50/0x60
> > > [    5.100093]  [<c1c1c729>] ? snd_msnd_init+0x49/0x49
> > > [    5.100715]  [<c1c1c73b>] snd_msnd_init+0x12/0x49
> > > [    5.101336]  [<c1bd3bb3>] do_one_initcall+0x90/0x155
> > > [    5.102207]  [<c10d00e0>] ? put_prev_task_fair+0x130/0x490
> > > [    5.102891]  [<c123ecfd>] ? strlen+0xd/0x20
> > > [    5.103490]  [<c1bd3500>] ? do_early_param+0x5e/0x7a
> > > [    5.104164]  [<c10b4a6c>] ? parse_args+0x1ec/0x330
> > > [    5.104746]  [<c17b3fa8>] ? _raw_spin_unlock_irqrestore+0x78/0x90
> > > [    5.105526]  [<c1bd3e18>] kernel_init_freeable+0x1a0/0x23f
> > > [    5.106240]  [<c1bd351c>] ? do_early_param+0x7a/0x7a
> > > [    5.106961]  [<c179bbcb>] kernel_init+0xb/0x150
> > > [    5.107566]  [<c17b5937>] ret_from_kernel_thread+0x1b/0x28
> > > [    5.108356]  [<c179bbc0>] ? rest_init+0xc0/0xc0
> > > [    5.109054] ---[ end trace f2f06bffaee363dd ]---
> > > [    5.109705] ------------[ cut here ]------------
> > 
> > The patch below should fix the issue.
> 
> Thanks for the quick fix! Takashi, you may directly push it to your
> tree (to some temp branch if not sure) and I'll then check the test
> results. :)

Yep, done.


thanks,

Takashi