lor with sndstat (amd64)

[Mathew Kanner]

On Aug 26, K Chapman wrote:
> running: amd64
> 6.0-CURRENT FreeBSD 6.0-CURRENT #1: Wed Aug 25
> 23:40:19 EDT
> 
> sound from kernel config:
> device          sound
> device          "snd_via8233"
> 
> noticed this on console ater cat /dev/sndstat :
> lock order reversal
>  1st 0xffffffff805d03e0 sndstat (sndstat) @
> /usr/src/sys/dev/sound/pcm/sndstat.c:165
>  2nd 0xffffff002b61e8f0 user map (user map) @
> /usr/src/sys/vm/vm_map.c:2997
> KDB: stack backtrace:
> witness_checkorder() at witness_checkorder+0x654
> _sx_xlock() at _sx_xlock+0x51
> vm_map_lookup() at vm_map_lookup+0x44
> vm_fault() at vm_fault+0xba
> trap_pfault() at trap_pfault+0x111
> trap() at trap+0x1b5
> alltraps_with_regs_pushed() at
> alltraps_with_regs_pushed+0x5
> sndstat_read() at sndstat_read+0x8b
> spec_read() at spec_read+0x1ea
> vn_read() at vn_read+0x153
> dofileread() at dofileread+0x9a
> read() at read+0x68
> syscall() at syscall+0x4b0
> Xfast_syscall() at Xfast_syscall+0xa8
> --- syscall (3, FreeBSD ELF64, read), rip =
> 0x200689708, rsp = 0x7fffffffeab8, rbp =
> 0x7fffffffedc4 ---
> 
> saw reports of a lor with sndstat at the end of last
> year, but that seemed to have been resolved.  sound
> seems fine however... plays cd's, mp3's ok.

	Hello "K",
	I've never seen this one before, I'll take a look at this on
the weekend, but since I don't have a 8233 or and AMD64 I may not find
it.

	--Mat

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