ref: 1a02a458839fd85ff58856a666918db1d111adec
parent: 18a50d04ac1587ad8119feffcc1fa9f7b9b90c6d
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Wed Jan 1 02:39:17 EST 2014
kernel: nil check, exited procs handling in postnote() make sure not to dereference Proc* nil pointer. this can potentially happen from devip which has code like: if(er->read4p) postnote(er->read4p, 1, "unbind", 0); the process it is about to kill can zero er->read4p at any time, so there is the possibility of the condition to be true and then er->read4p becoming nil. check if the process has already exited (p->pid == 0) in postnote() under p->debug qlock.