Comment 0 for bug 1807757

Microsoft has identified a multiple-NIC-deadlock issue on Hyper-V VMs. This bug is fixed by the following commit, which is in mainline as of v4.20-rc6:
37c2578c0c40 ("Drivers: hv: vmbus: Offload the handling of channels to two workqueues")

A second commit is also needed to prevent a deadlock with single NIC VMs. This commit is in mainline as of 4.19-rc3:
e04e7a7bbd4b ("hv_netvsc: Fix a deadlock by getting rtnl lock earlier in netvsc_probe()")

linux-azure, Bionic, Cosmic and Disco(4.15+ kernels) require the following two dependent commits:
4.19-rc1 - 50229128727f ("Drivers: hv: vmbus: Fix the offer_in_progress in vmbus_process_offer()")
4.19-rc4 - 6712cc9c2211 ("vmbus: don't return values for uninitalized channels")

Xenial(4.14 and older kernels) require the following four dependent commits:
4.15-rc1 - c2e5df616e1a ("vmbus: add per-channel sysfs info")
4.15-rc6 - 869b5567e12f ("vmbus: unregister device_obj->channels_kset")
4.19-rc1 - 50229128727f ("Drivers: hv: vmbus: Fix the offer_in_progress in vmbus_process_offer()")
4.19-rc4 - 6712cc9c2211 ("vmbus: don't return values for uninitalized channels")