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From: Ivan Voras <ivoras@freebsd.org>
Date: Thu, 25 Feb 2010 01:23:44 +0100
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Cc: freebsd-net@freebsd.org
Subject: Re: 8-stable crashes in vmware (possible em driver issue?)
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Ivan Voras wrote:
> I have a fairly recent 8-stable machine running under VMWare ESXi 3.5 
> (amd64 guest), which apparently crashes every few days from the same 
> causes:
> 
> em0: discard frame w/o packet header
> em0: discard frame w/o packet header
> em0: discard frame w/o packet header
> Panic string: sbsndptr: sockbuf 0xffffff007cca8c20 and mbuf 
> 0xffffff00490a6400 clashing

In case someone is interested or has an idea - on this machine I have 
multiple crashed cores with similarily strange problems all connected 
with networking and/or the em driver:

1)
em0: watchdog timeout -- resetting
Fatal trap 12: page fault while in kernel mode
current process         = 0 (em0 taskq)

2)
em0: watchdog timeout -- resetting
Fatal trap 9: general protection fault while in kernel mode
current process         = 1219 (slapd)

3)
em0: discard frame w/o packet header
panic: sbdrop

I'm scratching my head about the #2 above - I don't think trap#9 is usual.