Author: rodrigc
Date: Mon Nov 25 20:20:34 2013
New Revision: 258588
URL: http://svnweb.freebsd.org/changeset/base/258588
Log:
In sys/netpfil/ipfw/ip_fw_nat.c:vnet_ipfw_nat_uninit() we call
"IPFW_WLOCK(chain);".
This lock gets deleted in sys/netpfil/ipfw/ip_fw2.c:vnet_ipfw_uninit().
Therefore, vnet_ipfw_nat_uninit() *must* be called before vnet_ipfw_uninit(),
but this doesn't always happen, because the VNET_SYSINIT order is the same
for both functions.
In sys/net/netpfil/ipfw/ip_fw2.c and sys/net/netpfil/ipfw/ip_fw_nat.c,
IPFW_SI_SUB_FIREWALL == IPFW_NAT_SI_SUB_FIREWALL ==
SI_SUB_PROTO_IFATTACHDOMAIN
and
IPFW_MODULE_ORDER == IPFW_NAT_MODULE_ORDER
Consequently, if VIMAGE is enabled, and jails are created and destroyed,
the system sometimes crashes, because we are trying to use a deleted lock.
To reproduce the problem:
(1) Take a GENERIC kernel config, and add options for: VIMAGE, WITNESS,
INVARIANTS.
(2) Run this command in a loop:
jail -l -u root -c path=/ name=foo persist vnet && jexec foo ifconfig
lo0 127.0.0.1/8 && jail -r foo
(see
http://lists.freebsd.org/pipermail/freebsd-current/2010-November/021280.html )
Fix the problem by increasing the value of IPFW_NAT_SI_SUB_FIREWALL,
so that vnet_ipfw_nat_uninit() runs after vnet_ipfw_uninit().
Modified:
head/sys/netpfil/ipfw/ip_fw_nat.c
Modified: head/sys/netpfil/ipfw/ip_fw_nat.c
==============================================================================
--- head/sys/netpfil/ipfw/ip_fw_nat.c Mon Nov 25 20:17:55 2013
(r258587)
+++ head/sys/netpfil/ipfw/ip_fw_nat.c Mon Nov 25 20:20:34 2013
(r258588)
@@ -676,7 +676,7 @@ static moduledata_t ipfw_nat_mod = {
};
/* Define startup order. */
-#define IPFW_NAT_SI_SUB_FIREWALL SI_SUB_PROTO_IFATTACHDOMAIN
+#define IPFW_NAT_SI_SUB_FIREWALL (SI_SUB_PROTO_IFATTACHDOMAIN +
1)
#define IPFW_NAT_MODEVENT_ORDER (SI_ORDER_ANY - 255)
#define IPFW_NAT_MODULE_ORDER (IPFW_NAT_MODEVENT_ORDER + 1)
#define IPFW_NAT_VNET_ORDER (IPFW_NAT_MODEVENT_ORDER + 2)
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