Following myself up...looks like David Howells already fixed this in
a commit from Tuesday. The patch I posted is actually a diff against
that, which I didn't notice until now. Whoops and nevermind.
I will pursue with appropriate folks stable backports for anyone
running 2.6.18 or 2.6.19
The randomized key->serial choice algorithm introduced in 2.6.18
exposed some bugs in the handling of collisions in the rbtree of
allocated key->serials. Collisions then resulted in eventual kernel
oopses (due to rbtree corruption) once cleanup was attempted. This
patch corrects the colli
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