linux-kernel - Re: 2.6.38-rc3 regression on parisc: segfaults

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Message-Id: <20110204161706.B544B4DF4@hiauly1.hia.nrc.ca>
Date:	Fri, 4 Feb 2011 11:17:06 -0500 (EST)
From:	"John David Anglin" <dave@...uly1.hia.nrc.ca>
To:	carlos@...temhalted.org (Carlos O'Donell)
Cc:	dave.anglin@...-cnrc.gc.ca, mroos@...ux.ee,
	linux-parisc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: 2.6.38-rc3 regression on parisc: segfaults

> > This is possibly the infamous COW bug.
> 
> The COW bug that is triggered by a COW from an LWS-CAS? The solution
> to which is to use locks around the LWS-CAS even on UP? I'd forgotten
> about this issue actually, I should push that patch out to James.

I was actually thinking of the fork/clone race for which there are various
testcases on the wiki.  The aptitude segv is with a SMP kernel, so I don't
think this is the UP LWS_CAS issue.  However, I agree you should push
the change.

Dave
-- 
J. David Anglin                                  dave.anglin@...-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6602)
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