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Date: Sat, 9 Aug 2003 22:13:57 +0400
From: Dmitry Sivachenko <mitya@cavia.pp.ru>
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Subject: LOR in pcm
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Hello!

I have Chaintech Apogee 7VGL motherboard with on-board CMedia 8738 audio chip.
Kernel identifies it as follows:
pcm0: <CMedia CMI8738> port 0xe400-0xe4ff irq 10 at device 19.0 on pci0

I am running very recent -current.

When I am watching movies in mplayer, I get on the console from time to time:

lock order reversal
 1st 0xc4021c40 pcm0 (sound softc) @ /usr/src/sys/dev/sound/pci/cmi.c:520
 2nd 0xc402c4c0 pcm0:play:0 (pcm channel) @ /usr/src/sys/dev/sound/pcm/channel.c
:440
Stack backtrace:
backtrace(c03503c2,c402c4c0,c4045154,c03420f5,c03421cf) at backtrace+0x17
witness_lock(c402c4c0,8,c03421cf,1b8,c) at witness_lock+0x672
_mtx_lock_flags(c402c4c0,0,c03421cf,1b8,800000c1) at _mtx_lock_flags+0xba
chn_intr(c4045100,c,10000,208,c4021b80) at chn_intr+0x2f
cmi_intr(c4045280,0,c034b2ba,215,c405f1e4) at cmi_intr+0xa0
ithread_loop(c4045200,d6947d48,c034b12c,30e,0) at ithread_loop+0x182
fork_exit(c01ef870,c4045200,d6947d48) at fork_exit+0xcf
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xd6947d7c, ebp = 0 ---

I could provide additional information if needed.