[<ffffffff8101b014>] save_stack_trace_tsk+0x24/0x50
[<ffffffff8122e464>] proc_pid_stack+0xa4/0xf0
[<ffffffff81230554>] proc_single_show+0x64/0xa0
[<ffffffff811e30c2>] seq_read+0xf2/0x410
[<ffffffff811ba515>] vfs_read+0xb5/0x1a0
[<ffffffff811ba911>] sys_read+0x51/0xb0
[<ffffffff81554961>] tracesys+0x93/0xb9
[<ffffffffffffffff>] 0xffffffffffffffff