Repeated crashes in 6.3-PRERELEASE

[Frank Mayhar]

On Sat, 2007-12-29 at 11:28 -0800, Frank Mayhar wrote:
> This is on a very recent -stable (like, as of just a couple of days
> ago).  Doing nothing in particular, ZERO_COPY_SOCKETS _not_ specified in
> the config.  This has happened twice this morning; if it happens again
> I'll drop back to my older kernel, built back in May.

Sigh.  In the last three days I've had no fewer than four crashes:  This
one, another just like it that I didn't get a dump for, a "Fatal trap
12: page fault while in kernel mode" in buf_splay():

#27 0xffffffff802e2cb4 in buf_splay (lblkno=0, xflags=2 '\002', root=0x9000)
    at /usr/src/sys/kern/vfs_subr.c:1339
#28 0xffffffff802e2e08 in buf_vlist_remove (bp=0xffffffffa1919340)
    at /usr/src/sys/kern/vfs_subr.c:1371
#29 0xffffffff802e4dab in brelvp (bp=0xffffffffa1919340)
    at /usr/src/sys/kern/vfs_subr.c:1502
#30 0xffffffff802d28f1 in getnewbuf (slpflag=0, slptimeo=0, size=2, 
    maxsize=16384) at /usr/src/sys/kern/vfs_bio.c:1801

(where bp->b_left is 0x9000)

and a "panic: backgroundwritedone: lost buffer."  I have a dump for each
of the three unique scenarios.  At the moment I've dropped back to the
older kernel and am keeping my fingers crossed that it will run okay.
I'm beginning to suspect hardware, although as two of the three are in
the buf code there might be a problem there...  If it continues with the
older kernel then it is most likely hardware but if not then there's a
problem.

Has anyone else encountered anything like this in 6.3-PRERELEASE?
-- 
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