Date: Mon, 14 Jul 2008 16:52:46 -0600 From: James Gritton <jamie@gritton.org> To: freebsd-virtualization@freebsd.org Subject: IFNET_WLOCK missing from if_reassign_common Message-ID: <487BD8BE.1040609@gritton.org>
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[-- Attachment #1 --]
In testing jail_set_vimage, I found that moving a network interface
cause a assertion failure in ifnet_setbyindex. It turns out that
if_reassign_common in kern_vimage.c should be locking IFNET_WLOCK. I'm
including a patch that locks it in the same way it's done in if_alloc
(which seems to be the inspiration for much of this code).
- Jamie
[-- Attachment #2 --]
--- ov/src/sys/kern/kern_vimage.c Wed Jul 9 14:14:03 2008
+++ src/sys/kern/kern_vimage.c Mon Jul 14 16:44:18 2008
@@ -283,10 +283,12 @@
do {
INIT_VNET_NET(curvnet);
+ IFNET_WLOCK();
ifnet_setbyindex(ifp->if_index, NULL);
/* XXX: should be locked with if_findindex() */
while (V_if_index > 0 && ifnet_byindex(V_if_index) == NULL)
V_if_index--;
+ IFNET_WUNLOCK();
} while (0);
CURVNET_SET_QUIET(new_vnet);
@@ -309,7 +311,9 @@
V_if_index = ifp->if_index;
if (V_if_index >= V_if_indexlim)
if_grow();
+ IFNET_WLOCK();
ifnet_setbyindex(ifp->if_index, ifp);
+ IFNET_WUNLOCK();
/* Rename the ifnet */
if (new_vnet == ifp->if_home_vnet) {
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