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Date:      Fri, 18 Oct 2002 16:16:06 +0100
From:      Ian Dowse <iedowse@maths.tcd.ie>
To:        Chris BeHanna <behanna@zbzoom.net>
Cc:        FreeBSD-Stable <stable@freebsd.org>
Subject:   Re: FFS Panic in 4.7 
Message-ID:   <200210181616.aa29895@salmon.maths.tcd.ie>
In-Reply-To: Your message of "Fri, 18 Oct 2002 09:10:06 EDT." <20021018090248.U667-300000@topperwein.dyndns.org> 

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In message <20021018090248.U667-300000@topperwein.dyndns.org>, Chris BeHanna wr
ites:
>    The triggering event was an attempt to dereference a null vnode
>pointer at /usr/src/sys/ufs/ffs/ffs_vfsops.c, line 996.  I've attached
>my kernel config and a dmesg.

>#3  0xc02f3bcc in trap_fatal (frame=0xddce3d48, eva=999176615)

Note that the `eva=999176615' above means that it was not a NULL
dereference - gdb is probably just confused about the value of `vp'.
The values of `eva' and `tf_eax' suggest that in fact it was trying
to dereference `ip', but `ip' contained the junk value 0x3b8e3977.
That could indicate some kind of memory corruption...

What does `p *mp->mnt_nvnodelist.tqh_first' print?

Ian

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