git: kernel - Fix one-cycle MP race in vshouldmsync()
commit aed76ef1f778cc4185ddd699631316d05d6811b6
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date: Sun Sep 12 10:30:38 2010 -0700
kernel - Fix one-cycle MP race in vshouldmsync()
* vshouldmsync() is the mntvnode fast function, which is called without
any vnode lock. vp->v_object can thus get ripped out from under the
scan function.
Hold vmobj_token through the scan so any pointer accessed via
v_object remains stable (even if no longer related to the vnode
due to the race).
Reported-by: swildner
Summary of changes:
sys/kern/vfs_mount.c | 7 +++++++
sys/kern/vfs_subr.c | 14 ++++++++++----
2 files changed, 17 insertions(+), 4 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/aed76ef1f778cc4185ddd699631316d05d6811b6
--
DragonFly BSD source repository