[<0>] __wait_rcu_gp+0x116/0x120
[<0>] synchronize_rcu+0xba/0xd0
[<0>] key_garbage_collector+0x16f/0x430
[<0>] process_one_work+0x1e8/0x3c0
[<0>] worker_thread+0x50/0x3b0
[<0>] kthread+0xd9/0x100
[<0>] ret_from_fork+0x22/0x30
