These pernet_operations also look closed in themself.
Exit method touch only per-net structures, so it's
safe to execute them for several net namespaces in parallel.

Signed-off-by: Kirill Tkhai <ktk...@virtuozzo.com>
---
 net/netfilter/nfnetlink_cttimeout.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/net/netfilter/nfnetlink_cttimeout.c 
b/net/netfilter/nfnetlink_cttimeout.c
index 95b04702a655..6819300f7fb7 100644
--- a/net/netfilter/nfnetlink_cttimeout.c
+++ b/net/netfilter/nfnetlink_cttimeout.c
@@ -586,6 +586,7 @@ static void __net_exit cttimeout_net_exit(struct net *net)
 static struct pernet_operations cttimeout_ops = {
        .init   = cttimeout_net_init,
        .exit   = cttimeout_net_exit,
+       .async  = true,
 };
 
 static int __init cttimeout_init(void)

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