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Date:      Mon, 20 Jan 2003 22:45:03 -0800
From:      Juli Mallett <>
To:        Cameron Grant <>,
Subject:   pcm panic (dsp_write nonbusy channel)
Message-ID:  <>

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lock order reversal
 1st 0xc12602c0 pcm0:play:0 (pcm channel) @ ../../../dev/sound/pcm/sound.c:191
  2nd 0xc1260440 pcm0 (sound cdev) @ ../../../dev/sound/pcm/sound.c:163
acquiring duplicate lock of same type: "pcm channel"
 1st pcm0:record:0 @ ../../../dev/sound/pcm/dsp.c:328
 2nd pcm0:play:0 @ ../../../dev/sound/pcm/dsp.c:335
Expensive timeout(9) function: 0xc0244c80(0xc0a06e00) 0.001034076
Expensive timeout(9) function: 0xc024da60(0) 0.001427603
panic: dsp_write: nonbusy channel

#13 0xc01d61c1 in dsp_write ()
#14 0xc0200911 in spec_write ()
#15 0xc0200313 in spec_vnoperate ()
#16 0xc0292d27 in vn_write ()
#17 0xc025ed74 in dofilewrite ()
#18 0xc025ec1b in write ()
#19 0xc0347d52 in syscall ()
#20 0xc03393ed in Xint0x80_syscall ()

At the time I was listening to an mp3 in a loop.
Juli Mallett <>
AIM: BSDFlata -- IRC: juli on EFnet.
OpenDarwin, Mono, FreeBSD Developer.
ircd-hybrid Developer, EFnet addict.
FreeBSD on MIPS-Anything on FreeBSD.

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