Date: Wed, 4 Dec 2013 07:50:18 +0000 (UTC) From: Craig Rodrigues <rodrigc@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r258912 - stable/10/sys/netpfil/ipfw Message-ID: <201312040750.rB47oICn013416@svn.freebsd.org>
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Author: rodrigc Date: Wed Dec 4 07:50:18 2013 New Revision: 258912 URL: http://svnweb.freebsd.org/changeset/base/258912 Log: MFC r258588 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(). Approved by: re (gjb) Modified: stable/10/sys/netpfil/ipfw/ip_fw_nat.c Directory Properties: stable/10/sys/ (props changed) Modified: stable/10/sys/netpfil/ipfw/ip_fw_nat.c ============================================================================== --- stable/10/sys/netpfil/ipfw/ip_fw_nat.c Wed Dec 4 07:46:53 2013 (r258911) +++ stable/10/sys/netpfil/ipfw/ip_fw_nat.c Wed Dec 4 07:50:18 2013 (r258912) @@ -674,7 +674,7 @@ 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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