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

Public bug reported:

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")

** Affects: linux (Ubuntu)
Importance: Medium
Assignee: Joseph Salisbury (jsalisbury)
Status: Triaged

** Affects: linux (Ubuntu Xenial)
Importance: Medium
Assignee: Joseph Salisbury (jsalisbury)
Status: Triaged

** Affects: linux (Ubuntu Bionic)
Importance: Medium
Assignee: Joseph Salisbury (jsalisbury)
Status: Triaged

** Affects: linux (Ubuntu Cosmic)
Importance: Medium
Assignee: Joseph Salisbury (jsalisbury)
Status: Triaged

** Affects: linux (Ubuntu Disco)
Importance: Medium
Assignee: Joseph Salisbury (jsalisbury)
Status: Triaged


** Tags: bionic cosmic disco kernel-hyper-v xenial

** Changed in: linux (Ubuntu)
Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu)
Status: New => Triaged

** Also affects: linux (Ubuntu Cosmic)
Importance: Undecided
Status: New

** Also affects: linux (Ubuntu Disco)
Importance: Medium
Assignee: Joseph Salisbury (jsalisbury)
Status: Triaged

** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New

** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New

** Changed in: linux (Ubuntu Cosmic)
Status: New => Triaged

** Changed in: linux (Ubuntu Bionic)
Status: New => Triaged

** Changed in: linux (Ubuntu Xenial)
Status: New => Triaged

** Changed in: linux (Ubuntu Cosmic)
Importance: Undecided => Medium

** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Medium

** Changed in: linux (Ubuntu Xenial)
Importance: Undecided => Medium

** Changed in: linux (Ubuntu Cosmic)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Xenial)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

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https://bugs.launchpad.net/bugs/1807757

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

Status in linux package in Ubuntu:
Triaged
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:
Triaged

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()")


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")

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