On Sat, 16 Oct 2010, Bjoern A. Zeeb wrote:
Author: bz Date: Sat Oct 16 19:53:22 2010 New Revision: 213932 URL: http://svn.freebsd.org/changeset/base/213932Log: MfP4 CH182763 (original version): Make it harder to exploit certain in_control() related races between the intiial lookup at the beginning and the time we will remove the entry from the lists by re-checking that entry is still in the list before trying to remove it. (*) It is believed that with the current code and locking strategy we cannot completely fix all race.
Just as a follow-up: a couple of weeks ago I spent too much time on this to come to that conclusion. Try running 3 or more parallel ifconfig loops adding and removing the very same address and it's only matter of seconds. In case someone is interested I have a way huger patch of unknown state around but it's always only shifiting the problem. A possibly better fix to change the locking strategy is currently under discussion.
Reported by: Nima Misaghian (nima_misa hotmail.com) on net@ 20100817 Tested by: Nima Misaghian (nima_misa hotmail.com) (original version) PR: kern/146250 Submitted by: Mikolaj Golub (to.my.trociny gmail.com) (different version) MFC after: 1 week Modified: head/sys/netinet/in.c
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