Date: Sun, 8 Apr 2001 06:10:02 -0700 (PDT) From: David Taylor <davidt@yadt.co.uk> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/26430: -CURRENT panics on cat /dev/dsp or cat /dev/audio Message-ID: <200104081310.f38DA2i67145@freefall.freebsd.org>
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The following reply was made to PR kern/26430; it has been noted by GNATS.
From: David Taylor <davidt@yadt.co.uk>
To: FreeBSD-gnats-submit@freebsd.org
Cc:
Subject: Re: kern/26430: -CURRENT panics on cat /dev/dsp or cat /dev/audio
Date: Sun, 8 Apr 2001 14:01:58 +0100
On Sun, 08 Apr 2001, davidt@yadt.co.uk wrote:
> >Description:
>
> attempting to read from /dev/audio and /dev/dsp causes the
> kernel to panic.
>
Here's a copy of a trace from ddb:
panic: mutex pcm0:record:0 not owned at /usr/src/sys/kernl/kern_sync.c:404
Debugger("panic")
Stopped at Debugger+0x45: pushl %ebx
db> trace
Debugger(c02df07b) at Debugger+0x45
panic(c02de2a8,c0e55838,c02df840,194,4) at panic+0x70
_mtx_assert(c1658c80,9,c02df840,194) at _mtx_assert+0x4e
msleep(c1663a00,c1658c80,14c,c02d6685,1) at msleep+2a3
chn_sleep(c0e55800,c02d6685,1,4,0) at chn_sleep+0x21
chn_read(c0e55800,cecc4ef0,cecc4ef0,cecc4ef0,c0e55800) at chn_read+0x164
dsp_read(c164c800,0,cecc4ef0,20000,cece9500) at dsp_read+0x172
sndread(c036b50c,cecc4ef0,20000,c036b50c,0) at sndread+0x5b
spec_read(cecc4e80,cecc4e94,c01ec3f7,cecc4e80,cecc4ef0) at spec_read+0x74
spec_vnoperate(cecc4e80,cecc4ef0,cecc4f80,400,0) at spec_vnoperate+0x15
vn_read(c1c57a00,cecc4ef0,c2096200,0,cec1cfe0) at vn_read+0x17
dofileread(cec1cfe0,c1c57a00,3,805c000,400) at dofileread+0xb2
read(cec1cfe0,cecc4f80,bfbffb60,3,1) at read+0x3b
syscall(2f,2f,2f,1,3) at syscall+0x59d
syscall_with_err_pushed() at syscall_with_err_pushed+0x1b
db> call dumpsys
dumping to dev ad0s4b, offset 584197
dump ata0: resetting devices .. panic: mutex sched lock recursed at /usr/src/sys/kernl/kern_sync.c:855
Uptime: 1h13m41s
Dump already in progress, bailing...
Automatic reboot in 15 seconds - press a key on the console to abort
--> Press a key on the console to reboot <--
Rebooting..
--
David Taylor
davidt@yadt.co.uk
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