Head of thread on recent RCU updates:
http://lkml.org/lkml/2011/6/8/321

from that:

4.      Restore checks for blocking within RCU read-side critical
sections under CONFIG_PROVE_RCU.

More commentary about that here:
https://lkml.org/lkml/2011/6/4/115
http://lkml.org/lkml/2011/6/8/354
http://paulmck.livejournal.com/27219.html
http://kernel.org/pub/linux/kernel/people/paulmck/Answers/RCU/RCUdp.html

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https://bugs.launchpad.net/bugs/793796

Title:
  2.6.38-10 panic after ejecting drive

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