From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: kvm-85 sometimes not starting on 2.6.30-rc5
Date: Sat, 23 May 2009 19:20:01 +0200
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Cc: Nikola Ciprich <extmaillist@linuxbox.cz>,
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To: Avi Kivity <avi@redhat.com>
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On Sun, May 17, 2009 at 11:27:42PM +0300, Avi Kivity wrote:
> Andrea, looks like the mother of all locks below.

eheh yes that really is the mother of all locks ;).

So the thing is, like BUG says MAX_LOCK_DEPTH is too low, to fix you
should rebuild after increasing it in include/linux/sched.h to say 96.

Likely somebody changed qemu-kvm over time in a way that allocates
more vmas than before.