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Commit 350d6591 authored by Eric Dumazet's avatar Eric Dumazet Committed by Greg Kroah-Hartman
Browse files

net: avoid weird emergency message 



[ Upstream commit d7c04b05c9ca14c55309eb139430283a45c4c25f ]

When host is under high stress, it is very possible thread
running netdev_wait_allrefs() returns from msleep(250)
10 seconds late.

This leads to these messages in the syslog :

[...] unregister_netdevice: waiting for syz_tun to become free. Usage count = 0

If the device refcount is zero, the wait is over.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Reported-by: default avatarsyzbot <syzkaller@googlegroups.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a5f56b52

net/core/dev.c

+1 −1
Original line number Diff line number Diff line
@@ -7499,7 +7499,7 @@ static void netdev_wait_allrefs(struct net_device *dev) 


		refcnt = netdev_refcnt_read(dev);



		if (time_after(jiffies, warning_time + 10 * HZ)) {

		if (refcnt && time_after(jiffies, warning_time + 10 * HZ)) {

			pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",

				 dev->name, refcnt);

			warning_time = jiffies;