/dev/soiund/pcm/dsp.c: uma_zalloc with non-sleepable lock held

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Hi,

Hit this with WITNESS (today's -CURRENT).  It seems that if I play music
and have some other sound playing then the system would stop to respond.
~ Is this an known issue?

May 25 23:26:50 charlie kernel: uma_zalloc_arg: zone "16" with the
following non-sleepable locks held:
May 25 23:26:50 charlie kernel: exclusive sleep mutex pcm0 (sound cdev)
r = 0 (0xffffff00019a9c20) locked _at_
/data/src/sys/modules/sound/sound/../../../dev/sound/pcm/dsp.c:650
May 25 23:26:50 charlie kernel: KDB: stack backtrace:
May 25 23:26:50 charlie kernel: db_trace_self_wrapper() at
db_trace_self_wrapper+0x2a
May 25 23:26:50 charlie kernel: witness_warn() at witness_warn+0x248
May 25 23:26:50 charlie kernel: uma_zalloc_arg() at uma_zalloc_arg+0x334
May 25 23:26:50 charlie kernel: malloc() at malloc+0x8a
May 25 23:26:50 charlie kernel: notify() at notify+0x67
May 25 23:26:50 charlie kernel: destroy_devl() at destroy_devl+0x23b
May 25 23:26:50 charlie kernel: destroy_dev() at destroy_dev+0x19
May 25 23:26:50 charlie kernel: snd_clone_gc() at snd_clone_gc+0xc4
May 25 23:26:50 charlie kernel: snd_clone_unref() at snd_clone_unref+0x58
May 25 23:26:50 charlie kernel: dsp_close() at dsp_close+0x6d5
May 25 23:26:50 charlie kernel: devfs_close() at devfs_close+0x15c
May 25 23:26:50 charlie kernel: vn_close() at vn_close+0xb6
May 25 23:26:50 charlie kernel: vn_closefile() at vn_closefile+0x80
May 25 23:26:50 charlie kernel: devfs_close_f() at devfs_close_f+0x1a
May 25 23:26:50 charlie kernel: _fdrop() at _fdrop+0x23
May 25 23:26:50 charlie kernel: closef() at closef+0x4c
May 25 23:26:50 charlie kernel: kern_close() at kern_close+0x10d
May 25 23:26:50 charlie kernel: syscall() at syscall+0x1bf
May 25 23:26:50 charlie kernel: Xfast_syscall() at Xfast_syscall+0xab
May 25 23:26:50 charlie kernel: --- syscall (6, FreeBSD ELF64, close),
rip = 0x804651f5c, rsp = 0x7fffffffd5e8, rbp = 0x803aa53f0 ---

Cheers,
- --
** Help China's quake relief at http://www.redcross.org.cn/
|>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Xin LI <delphij_at_delphij.net>	http://www.delphij.net/
FreeBSD - The Power to Serve!
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