[<0>] __wait_rcu_gp+0x126/0x130
[<0>] synchronize_rcu_normal+0x12f/0x1a0
[<0>] key_garbage_collector+0x17c/0x410
[<0>] process_one_work+0x196/0x3c0
[<0>] worker_thread+0x281/0x3a0
[<0>] kthread+0x104/0x110
[<0>] ret_from_fork+0x2b/0x50
