On Mon, Jun 10, 2019 at 9:39 AM Ilya Maximets <i.maximets@xxxxxxxxxxx> wrote: > > Device that bound to XDP socket will not have zero refcount until the > userspace application will not close it. This leads to hang inside > 'netdev_wait_allrefs()' if device unregistering requested: > > # ip link del p1 > < hang on recvmsg on netlink socket > > > # ps -x | grep ip > 5126 pts/0 D+ 0:00 ip link del p1 > > # journalctl -b > > Jun 05 07:19:16 kernel: > unregister_netdevice: waiting for p1 to become free. Usage count = 1 > > Jun 05 07:19:27 kernel: > unregister_netdevice: waiting for p1 to become free. Usage count = 1 > ... Thanks. I hit the same issue quite often when using veth driver to test AF_XDP. > > Fix that by implementing NETDEV_UNREGISTER event notification handler > to properly clean up all the resources and unref device. > > This should also allow socket killing via ss(8) utility. > > Fixes: 965a99098443 ("xsk: add support for bind for Rx") > Signed-off-by: Ilya Maximets <i.maximets@xxxxxxxxxxx> > --- Tested-by: William Tu <u9012063@xxxxxxxxx>
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