linux-kernel - Re: Wierdness - linux-next KVM patch breaks Dell Latitude D820, KVM not in kernel

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Date:	Sat, 12 Sep 2009 16:55:33 -0400
From:	Valdis.Kletnieks@...edu
To:	Avi Kivity <avi@...hat.com>, Beth Kon <eak@...ibm.com>,
	rostedt@...dmis.org, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Wierdness - linux-next KVM patch breaks Dell Latitude D820, KVM not in kernel

On Wed, 09 Sep 2009 14:59:12 EDT, Valdis.Kletnieks@...edu said:

> So hopefully excluding kvm.git I'll track down the *original* hang...
> 
> Wish me luck. ;)

And luck was not to be had.  Apparently 'git bisect skip' has some bad O(n**2)
issues - I tried to exclude the kvm.git tree, and it ended up running literally
overnight with no signs of stopping (see the gory details here:
https://bugzilla.redhat.com/show_bug.cgi?id=522599 )  Now, I probably *could*
cobble up something to do the skip as a series of little 20-40 commit skips,
but that's just getting nuts. ;)

Given that I'm having little luck bisecting this issue in linux-next and
we're now into the merge window, does anybody have a *better* idea than letting
the issue get into Linus's tree around -rc1, and hope that bisects more nicely
than linux-next did, so -rc2 has a fix for it?

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