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 ]---
** Changed in: linux (Ubuntu)
Sourcepackagename: None => linux
Importance: Undecided => Critical
Status: New => Confirmed
--
kernel bug rpc nfs client
https://bugs.launchpad.net/bugs/212485
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