[<ffffffff81018a50>] save_stack_trace_tsk+0x19/0x33 [<ffffffff81147f02>] proc_pid_stack+0x74/0xc6 [<ffffffff81146895>] proc_single_show+0x4a/0x5f [<ffffffff81118bb4>] seq_read+0x18b/0x374 [<ffffffff81100124>] vfs_read+0xa2/0xe9 [<ffffffff81100455>] sys_read+0x45/0x6b [<ffffffff81357c9e>] system_call_fastpath+0x22/0x27 [<ffffffffffffffff>] 0xffffffffffffffff