[<0>] do_wait+0x1c7/0x230
[<0>] kernel_wait4+0xa6/0x140
[<0>] __do_sys_wait4+0x83/0x90
[<0>] do_syscall_64+0x52/0x170
[<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9