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由 Ilya Maximets 提交于
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 ... 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: 965a9909 ("xsk: add support for bind for Rx") Signed-off-by: NIlya Maximets <i.maximets@samsung.com> Acked-by: NJonathan Lemon <jonathan.lemon@gmail.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
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