git: kernel - Fix a few MP races against process status

Matthew Dillon dillon at
Sat Mar 5 16:08:45 PST 2011

commit 0d78b86e0a2315042ff35cf013868289cb1c7acf
Author: Matthew Dillon <dillon at>
Date:   Sat Mar 5 16:05:20 2011 -0800

    kernel - Fix a few MP races against process status
    * proc->p_token is required when traversing p->p_lwp_tree.
    * Reorder lwp insertion on lwp_fork() so scan races see a whole lwp
      instead of a partially initialized one.
    * Check for NULL p->p_pgrp and friends when only using proc_token to
      scan the process list to deal with new processes that are still in the
      middle of being fork()'d.
    Reported-by: Peter Avalos <peter at>,
    	     Antonio Huete Jimenez <tuxillo at>

Summary of changes:
 sys/kern/kern_fork.c  |   25 +++++++++++++------------
 sys/kern/kern_proc.c  |   28 +++++++++++++++++++++-------
 sys/kern/kern_synch.c |   25 ++++++++++++++++---------
 3 files changed, 50 insertions(+), 28 deletions(-)

DragonFly BSD source repository

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