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73416ba
(Get the code!)
Apparmor seems less likely to be the cause, as does any of Ubuntu's "sauce" patches. I have a report from someone who is using a completely stock kernel who has seen this bug on 2.6.28, 2.6.28.4, and 2.6.29-rc6 (which if confirmed rules out my "most likely fix" in comment #27 above). Since apparmor isn't in a stock mainstream kernel, it now looks like the problem may have been fixed sometime between 2.6.28-rc6 and 2.6.28-rc8.
(I would appreciate if others could confirm this, though --- since at least some people seem to be able to trigger this very easily, others seem to only trigger this on order of once a month or so. So if one of you Gentle Readers who have been able to reliably reproduce this hang can check to see whether or not it is present in stock 2.6.29-rc6, and but is apparently fixed in 2.6.29-rc8, I would be most grateful for the independent confirmation.)
Thanks to all who have been helping to work this bug!