[<ffffffff8101b9f4>] save_stack_trace_tsk+0x24/0x50 [<ffffffff8123cd54>] proc_pid_stack+0xa4/0xf0 [<ffffffff8123e616>] proc_single_show+0x66/0xa0 [<ffffffff811f0b99>] seq_read+0xb9/0x420 [<ffffffff811c8407>] vfs_read+0xb7/0x1a0 [<ffffffff811c8801>] sys_read+0x51/0xb0 [<ffffffff8156f3e7>] system_call_fastpath+0x35/0x3a [<ffffffffffffffff>] 0xffffffffffffffff