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Date: Sat, 25 Jun 2011 02:26:45 +0400
From: Andrey Chernov <ache@FreeBSD.ORG>
To: "Justin T. Gibbs" <gibbs@FreeBSD.ORG>
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Cc: current@FreeBSD.ORG, "Kenneth D. Merry" <ken@FreeBSD.ORG>,
	Eir Nym <eirnym@gmail.com>,
	Kostik Belousov <kostikbel@gmail.com>, will@FreeBSD.ORG
Subject: Re: Exactly that commit (was Re: Latest -current 100% hang at the
 late boot stage)
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On Fri, Jun 24, 2011 at 04:20:24PM -0400, Justin T. Gibbs wrote:
> Instead, I believe that either one of the GEOM taste methods is leaking an
> access reference (so cdclose() is not called), or the CD driver is failing
> to release the hold semaphore during probing.  Setting kern.geom.debugflags
> to '4' will trace the access calls and allow the GEOM side to be ruled out.
> If GEOM is exonerated, we can add tracing to cam_perihp_(un)hold to track
> this down further.

No problem. I just set kern.geom.debugflags=4 in loader.conf and here is 
new photo (with recent kernel, no patches):
http://img803.imageshack.us/img803/4679/25062011006.jpg
I skip all noisy parts related to ada0 and ada1 partitions probes.
As you can see, only 3 cd0-related geom call issued, right before cd1 
probe shown. Strange thing is that I see no single cd1-related geom 
call, but it may be because of hang.

-- 
http://ache.vniz.net/