Re: A soft lockup in vxlan module

[Cong Wang <amwang@redhat.com>]

On Tue, 2013-08-06 at 21:13 -0700, Stephen Hemminger wrote:
> 
> Probably the flush_workqueue can just be removed and let the normal
> refcounting work. The workqueue has a reference to device and socket,
> therefore the cleanups should work correctly.

Sounds reasonable, I am testing the following patch:

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 8bf31d9..c51ef9b 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1837,8 +1837,6 @@ static void vxlan_dellink(struct net_device *dev,
struct list_head *head)
        struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
        struct vxlan_dev *vxlan = netdev_priv(dev);
 
-       flush_workqueue(vxlan_wq);
-
        spin_lock(&vn->sock_lock);
        hlist_del_rcu(&vxlan->hlist);
        spin_unlock(&vn->sock_lock);