Date: Fri, 2 Mar 2001 15:33:07 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Jonathan Lemon <jlemon@flugsvamp.com> Cc: Mike Tancsa <mike@sentex.net>, Bosko Milekic <bmilekic@technokratis.com>, stable@FreeBSD.ORG, jlemon@flugsvamp.com, phk@critter.freebsd.dk Subject: Re: Continued panics on a recent STABLE machine Message-ID: <200103022333.f22NX7H10972@earth.backplane.com> References: <01a101c0a1ea$77a64b20$becbca18@jehovah> <4.2.2.20010228114855.03d28be0@marble.sentex.net> <4.2.2.20010301151110.01de4650@marble.sentex.net> <200103022307.f22N76Z10552@earth.backplane.com> <20010302171910.J25974@prism.flugsvamp.com>
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:That being said, my suspicion is that something is writing one word
:past the end of the (physically contigious) previous mbuf. This would
:be caused by something screwing up a length calculation in the kernel,
:or if a network driver just happened to DMA in a bit of extra garbage
:at the end of a network packet.
:
:To test this theory, I'm using the following patch to leave a bit of
:unused space at the end of the mbuf. So far, the site that was having
:problems hasn't crashed yet, but the jury is still out.
:--
:Jonathan
Ok. A real test of this suspicion would be to augment your patch
to zero out the pad area and then panic if it detects non-zero data
there.
-Matt
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