From owner-freebsd-mips@FreeBSD.ORG  Fri May 20 17:53:39 2011
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From: Juli Mallett <jmallett@FreeBSD.org>
Date: Fri, 20 May 2011 10:53:18 -0700
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To: Andrew Duane <aduane@juniper.net>
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Subject: Re: Two repeatable panics on CURRENT
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On Fri, May 20, 2011 at 10:46, Andrew Duane <aduane@juniper.net> wrote:
> I'm almost finished bringing up -CURRENT on my octeon blade, but have two=
 perfectly repeatable panics that I could use some help sorting out.
> [...]
> Also, when I halt the system:
>
> =A0 =A0 =A0 =A0Waiting (max 60 seconds) for system process `vnlru' to sto=
p...done
> =A0 =A0 =A0 =A0Waiting (max 60 seconds) for system process `bufdaemon' to=
 stop...done
> =A0 =A0 =A0 =A0Waiting (max 60 seconds) for system process `syncer' to st=
op...
> =A0 =A0 =A0 =A0Syncing disks, vnodes remaining...0 0 timed out
> =A0 =A0 =A0 =A0All buffers synced.
> =A0 =A0 =A0 =A02: lock order reversal:
> =A0 =A0 =A0 =A00 =A01st 0x9800000001e23bd8 ufs (ufs) @ /aduane/FreeBSDCur=
rent/src/sys/kern/vfs_mount.c:1190 3
> =A0 =A0 =A0 =A02nd 0x9800000001eaa458 devfs (devfs) @ /aduane/FreeBSDCurr=
ent/src/sys/kern/vfs_subr.c:0 2134
>
> This is with WITNESS turned on. I may turn it off for now, but does someo=
ne know about this?

Does the system actually panic after that?  That reversal is, I think,
at least very close to being harmless.