Jason Andryuk: > A toolstack may delete the vif frontend and backend xenstore entries > while xen-netfront is in the removal code path. In that case, the > checks for xenbus_read_driver_state would return XenbusStateUnknown, and > xennet_remove would hang indefinitely. This hang prevents system > shutdown. > > xennet_remove must be able to handle XenbusStateUnknown, and > netback_changed must also wake up the wake_queue for that state as well. > > Fixes: 5b5971df3bc2 ("xen-netfront: remove warning when unloading module")
I think this should go into stable since AFAIK the hanging network device can only be fixed by rebooting the guest. AFAICS this affects all 4.* branches since 5b5971df3bc2 got backported to them. Upstream commit c2d2e6738a209f0f9dffa2dc8e7292fc45360d61. Simon
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