FYI: RIP: 0010:[<ffffffff8122f04f>] [<ffffffff8122f04f>] cfq_free_io_context+0x18/0x34

[Roland McGrath]

That is fixed upstream in commit f362b73244fb16ea4ae127ced1467dd8adaa7733.
If that's not already queued for 2.6.35-stable, then it probably should be.

Thanks,
Roland