[<ffffffff8101aa54>] save_stack_trace_tsk+0x24/0x50 [<ffffffff8120ff94>] proc_pid_stack+0xa4/0xf0 [<ffffffff81212ea6>] proc_single_show+0x66/0xa0 [<ffffffff811c7e09>] seq_read+0xb9/0x420 [<ffffffff811a1fe7>] vfs_read+0xb7/0x1a0 [<ffffffff811a2331>] sys_read+0x51/0xb0 [<ffffffff81564357>] system_call_fastpath+0x35/0x3a [<ffffffffffffffff>] 0xffffffffffffffff