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authorHans Schillstrom <hans@schillstrom.com>2011-10-11 10:54:35 +0900
committerPablo Neira Ayuso <pablo@netfilter.org>2011-10-12 18:32:15 +0200
commitae1d48b23d5e79efbcf0cef4f0ebb9742361af59 (patch)
treeee357eda6a7a031be2756133a9f31be325081f21 /include/net/ip_vs.h
parent98d9ae841ad620045d653fb05764e4a899f42dbd (diff)
IPVS netns shutdown/startup dead-lock
ip_vs_mutext is used by both netns shutdown code and startup and both implicit uses sk_lock-AF_INET mutex. cleanup CPU-1 startup CPU-2 ip_vs_dst_event() ip_vs_genl_set_cmd() sk_lock-AF_INET __ip_vs_mutex sk_lock-AF_INET __ip_vs_mutex * DEAD LOCK * A new mutex placed in ip_vs netns struct called sync_mutex is added. Comments from Julian and Simon added. This patch has been running for more than 3 month now and it seems to work. Ver. 3 IP_VS_SO_GET_DAEMON in do_ip_vs_get_ctl protected by sync_mutex instead of __ip_vs_mutex as sugested by Julian. Signed-off-by: Hans Schillstrom <hans@schillstrom.com> Acked-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: Simon Horman <horms@verge.net.au> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'include/net/ip_vs.h')
-rw-r--r--include/net/ip_vs.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 1aaf915656f3..8fa4430f99c1 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -900,6 +900,7 @@ struct netns_ipvs {
volatile int sync_state;
volatile int master_syncid;
volatile int backup_syncid;
+ struct mutex sync_mutex;
/* multicast interface name */
char master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];