Commit 7281a665 authored Oct 20, 2016 by Andrey Vagin Committed by David S. Miller Oct 23, 2016

net: allow to kill a task which waits net_mutex in copy_new_ns



net_mutex can be locked for a long time. It may be because many
namespaces are being destroyed or many processes decide to create
a network namespace.

Both these operations are heavy, so it is better to have an ability to
kill a process which is waiting net_mutex.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent d65f2fa6

net/core/net_namespace.c

+8 −1

Original line number	Diff line number	Diff line
		@@ -379,7 +379,14 @@ struct net *copy_net_ns(unsigned long flags,

		get_user_ns(user_ns);

		mutex_lock(&net_mutex);
		rv = mutex_lock_killable(&net_mutex);
		if (rv < 0) {
		net_free(net);
		dec_net_namespaces(ucounts);
		put_user_ns(user_ns);
		return ERR_PTR(rv);
		}

		net->ucounts = ucounts;
		rv = setup_net(net, user_ns);
		if (rv == 0) {