2.6.32-rc5-git1 -- 2 locks held by cat -- running "find /sys | head-c 4" --> system hang

[Miles Lane]

2 locks held by cat/4179:
 #0:  (&p->lock){+.+.+.}, at: [<c10a3884>] seq_read+0x25/0x315
 #1:  (&dev_priv->mm.active_list_lock){+.+...}, at: [<c119a854>] i915_batchbuffer_info+0x2b/0x124
Pid: 4179, comm: cat Not tainted 2.6.32-rc5-git1 #2
Call Trace:
 [<c104874f>] ? __debug_show_held_locks+0x1e/0x20
 [<c1023fb0>] __might_sleep+0xf0/0xf7
 [<c101c393>] kmap+0x17/0x58
 [<c119a8d6>] i915_batchbuffer_info+0xad/0x124
 [<c10a39bf>] seq_read+0x160/0x315
 [<c108fb8c>] ? rw_verify_area+0x98/0xbb
 [<c10a385f>] ? seq_read+0x0/0x315
 [<c1090331>] vfs_read+0x75/0xa9
 [<c10903f9>] sys_read+0x3b/0x5d
 [<c1002a8f>] sysenter_do_call+0x12/0x36
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