[Bug 1807757] Re: Drivers: hv: vmbus: Offload the handling of channels to two workqueues

** Description changed:

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()")

+ The Disco development release has been rebased to upstream 4.19, so no
+ prereqs are needed, only commit 37c2578c0c40.

- linux-azure, Bionic, Cosmic and Disco(4.15+ kernels) require the following two dependent commits:
+ linux-azure, Bionic and Cosmic(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")

** Changed in: linux (Ubuntu Disco)
Status: Triaged => In Progress

--
You received this bug notification because you are subscribed to linux
in Ubuntu.
Matching subscriptions: Bgg, Bmail, Nb
https://bugs.launchpad.net/bugs/1807757

Title:
Drivers: hv: vmbus: Offload the handling of channels to two workqueues

Status in linux package in Ubuntu:
In Progress
Status in linux source package in Xenial:
Triaged
Status in linux source package in Bionic:
Triaged
Status in linux source package in Cosmic:
Triaged
Status in linux source package in Disco:
In Progress

Bug description:
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()")

The Disco development release has been rebased to upstream 4.19, so no
prereqs are needed, only commit 37c2578c0c40.

linux-azure, Bionic and Cosmic(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")

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1807757/+subscriptions