From owner-cvs-all  Mon Mar 17 15:41:39 2003
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To: Jeff Roberson <jroberson@chesapeake.net>
Cc: Poul-Henning Kamp <phk@phk.freebsd.dk>, dwmalone@FreeBSD.org,
	El Vampiro <vampiro@rootshell.ru>,
	"Evgueni V. Gavrilov" <aquatique@rusunix.org>,
	Mike Makonnen <mtm@identd.net>, src-committers@FreeBSD.org,
	cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
Subject: Re: kern/42277 
In-Reply-To: Your message of "Mon, 17 Mar 2003 16:22:05 EST."
             <20030317162051.R66343-100000@mail.chesapeake.net> 
Date: Mon, 17 Mar 2003 15:41:27 -0800
From: Kirk McKusick <mckusick@beastie.mckusick.com>
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	Date: Mon, 17 Mar 2003 16:22:05 -0500 (EST)
	From: Jeff Roberson <jroberson@chesapeake.net>
	To: Poul-Henning Kamp <phk@phk.freebsd.dk>
	cc: Kirk McKusick <mckusick@mckusick.com>, <dwmalone@FreeBSD.org>,
	   El Vampiro <vampiro@rootshell.ru>,
	   "Evgueni V. Gavrilov" <aquatique@rusunix.org>,
	   Mike Makonnen <mtm@identd.net>, <src-committers@FreeBSD.org>,
	   <cvs-src@FreeBSD.org>, <cvs-all@FreeBSD.org>
	Subject: Re: kern/42277 
	X-ASK-Info: Whitelist match

	UMA has a facility to track the previous owner of the memory.
	Assuming that is the problem I could give you a way to cache this
	information so we can print it out when we detect corruption.  I
	can work on this tonight.  What is the repro?

	Cheers,
	Jeff

I have not had any success in reproducing the problem on my machines,
but I am mostly running on 5.X these days. Evgueni V. Gavrilov (copied
on this message) seems to be able to produce the problem about once a
day on his machines. He is also very willing to help out by testing
patches and sending back reports. So, if you are able to provide him
with a patch to collect the information, I am sure that he will run it
and send back the results. He and I have already gone through all the
128-byte structures reported by `vmstat -m' looking for ones with a
short at 64-bytes and found no viable candidates. So, I was feeling 
rather stuck. But it sounds like you have a viable way of tracking
this down.

	Kirk McKusick

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