Status update: I've gotten started on finding the regression via git-
bisect. I was able to reproduce the bug on 2.6.27 vanilla, and unable to
do so on 2.6.22 vanilla. I'm currently down to just under seven thousand
candidate commits left. The whole thing is rather complicated by the
fact that configuration options change between kernel versions, which
has made me a bit leery of the possibility of actually isolating the
code change that introduces the bug.

Also, older kernel versions seem to cause X to die every so often, and
even apart from that, testing is slow, because finding out if a kernel
is bad or not is like the Halting Problem--I can only get a "yes"
answer, never a definitive "no".

-- 
Linux kernel 2.6.24-12 lockup
https://bugs.launchpad.net/bugs/204996
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