Comment 4 for bug 212485

I've bumped into the same bug, the trace is a bit different but the cause could be the same:

Call Trace:
 [sunrpc:queue_delayed_work+0x51/0x70] queue_delayed_work+0x51/0x70
 [lock_timer_base+0x27/0x60] lock_timer_base+0x27/0x60
 [<f8e65195>] call_bind+0x45/0x80 [sunrpc]
 [shpchp:del_timer_sync+0xe/0x20] del_timer_sync+0xe/0x20
 [<f8e6c07c>] rpc_delete_timer+0x2c/0x50 [sunrpc]
 [<f8e6c542>] __rpc_execute+0x62/0x280 [sunrpc]
 [10295.051592] [<f8e660c2>] rpc_release_client+0x32/0x60 [sunrpc]
 [<f8e6c760>] rpc_async_schedule+0x0/0x10 [sunrpc]
 [run_workqueue+0xbf/0x160] run_workqueue+0xbf/0x160
 [worker_thread+0x0/0xe0] worker_thread+0x0/0xe0
 [worker_thread+0x84/0xe0] worker_thread+0x84/0xe0
 [<c0140b70>] autoremove_wake_function+0x0/0x40
 [worker_thread+0x0/0xe0] worker_thread+0x0/0xe0
 [kthread+0x42/0x70] kthread+0x42/0x70
 [kthread+0x0/0x70] kthread+0x0/0x70
 [kernel_thread_helper+0x7/0x10] kernel_thread_helper+0x7/0x10

 =======================
Code: ac 00 00 00 c7 44 24 08 04 9a e7 f8 c7 04 24 30 d1 e7 f8 89 44 24 04 e8 2f 89 2b c7 c7 44 24 20 a0 ff ff ff e9 0c fe ff ff 66 90 <0f> 0b eb fe 0f b7 b0 ac 00 00 00 8b 57 24 8b 4f 20 8b 5f 2c 8b
 EIP: [<f8e74540>] rpcb_getport_async+0x290/0x430 [sunrpc] SS:ESP 0068:dfb99f00
 ---[ end trace d8ca4a218e8bc80c ]---