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Date: Thu, 22 Nov 2007 09:25:51 +0800
From: David Xu <davidxu@FreeBSD.org>
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To: Doug Barton <dougb@FreeBSD.org>
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Cc: attilio@FreeBSD.org, FreeBSD Current <freebsd-current@FreeBSD.org>,
	rwatson@FreeBSD.org
Subject: Re: boot-time crash in today's -current,
	and other threading problems
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Doug Barton wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: RIPEMD160
> 
> I'm spamming everyone who's had fingers in the threading code lately
> since I can't seem to find a specific commit that looks guilty.
> 
> On 19 Nov. I updated my -current system and noticed a regression where
> alpine (a new version of the pine mail client that uses threads) would
> crash while opening my mail folders with a sig 6. I figured I'd wait a
> day or two since it was obvious that there was some work going on with
> threads, and other things were working.
> 
> Today I upgraded again, and the new kernel crashes on startup.
> Traceback is below. Suggestions welcome.
> 
> Doug
> 
> ...

A sub-function was added to umtx code in kernel, it is not available in
old kernel, but the change should not cause kernel to panic.
you might have to rebuild and reinstall the world.

Regards,
David Xu