Re: LOR on AMD64

On Tue, 16 Aug 2005, Filippo Natali wrote:

> I have the same problem described here:
>
> http://lists.freebsd.org/pipermail/freebsd-current/2005-June/051157.html
>
> but on my machine I obtain the attached LOR instead of a panic, and the CPU
> runs at 100%.
>
> lock order reversal
>  1st 0xffffff003d684600 pcm0 (sound cdev) _at_ /usr/src/sys/modules/sound/sound/../../../dev/sound/pcm/dsp.c:214
>  2nd 0xffffffff8081e860 Giant (Giant) _at_ /usr/src/sys/kern/kern_synch.c:236
> KDB: stack backtrace:
> witness_checkorder() at witness_checkorder+0x4ba
> _mtx_lock_flags() at _mtx_lock_flags+0x4a
> msleep() at msleep+0x28a
> kmem_malloc() at kmem_malloc+0x22f
> uma_large_malloc() at uma_large_malloc+0x45
> malloc() at malloc+0x12b
> sndbuf_remalloc() at sndbuf_remalloc+0x97
> chn_setblocksize() at chn_setblocksize+0x1d0
> chn_tryspeed() at chn_tryspeed+0x13b
> chn_tryformat() at chn_tryformat+0xe7
> chn_setformat() at chn_setformat+0x20
> chn_reset() at chn_reset+0xdb
> dsp_open() at dsp_open+0x20a
> devfs_open() at devfs_open+0x256
> VOP_OPEN_APV() at VOP_OPEN_APV+0x74
> vn_open_cred() at vn_open_cred+0x38c
> kern_open() at kern_open+0xfd
> open() at open+0x25
> syscall() at syscall+0x4b2
> Xfast_syscall() at Xfast_syscall+0xa8
> --- syscall (5, FreeBSD ELF64, open), rip = 0x801ad87fc, rsp = 0x7fffffffa748, rbp = 0x1 ---
>
> %uname -a
> FreeBSD ulby.hq.netwing.it 6.0-BETA2 FreeBSD 6.0-BETA2 #0: Fri Aug 12 10:52:32
> CEST 2005     root_at_ulby.hq.netwing.it:/usr/obj/usr/src/sys/GENERIC  amd64

I added the LOR as #129
	http://sources.zabbadoz.net/freebsd/lor.html#129

-- 
Bjoern A. Zeeb				bzeeb at Zabbadoz dot NeT