** Also affects: linux-azure-4.15 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-azure-4.15 (Ubuntu Bionic)
Status: New => In Progress
** Changed in: linux-azure-4.15 (Ubuntu Bionic)
Importance: Undecided => Medium
** Changed in: linux-azure-4.15 (Ubuntu Bionic)
Assignee: (unassigned) => Tim Gardner (timg-tpi)
** Description changed:
[SRU Justification]
+
+ SF#00308239
[Impact]
A soft lockup is happening to Azure cloud customers due to a bug in
netvsc_poll.
Ubuntu 4.15.0-1103 has CONFIG_NET_POLL_CONTROLLER=y in kernel config
file, there is a bug in netvsc that may cause CPU lockup with
POLL_CONTROLLER. This bug has been fixed by the following patch:
commit 2a7f8c3b1d3feedee3aa319ac220cbde3725b5d5 ("hv_netvsc: remove
ndo_poll_controller")
This commit is in mainline as of 4.20-rc1.
Microsoft would like to request this patch in 4.15 based Azure kernels.
[Test Plan]
Run high stress network traffic on an Azure instance.
[Where problems could occur]
There could be a decrease in performance or dropped packets due to NAPI not
being able to keep up.
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https://bugs.launchpad.net/bugs/1924314
Title:
netvsc may cause CPU lockup
Status in linux package in Ubuntu:
Incomplete
Status in linux-azure-4.15 package in Ubuntu:
New
Status in linux source package in Bionic:
In Progress
Status in linux-azure-4.15 source package in Bionic:
In Progress
Bug description:
[SRU Justification]
SF#00308239
[Impact]
A soft lockup is happening to Azure cloud customers due to a bug in
netvsc_poll.
Ubuntu 4.15.0-1103 has CONFIG_NET_POLL_CONTROLLER=y in kernel config
file, there is a bug in netvsc that may cause CPU lockup with
POLL_CONTROLLER. This bug has been fixed by the following patch:
commit 2a7f8c3b1d3feedee3aa319ac220cbde3725b5d5 ("hv_netvsc: remove
ndo_poll_controller")
This commit is in mainline as of 4.20-rc1.
Microsoft would like to request this patch in 4.15 based Azure
kernels.
[Test Plan]
Run high stress network traffic on an Azure instance.
[Where problems could occur]
There could be a decrease in performance or dropped packets due to NAPI not
being able to keep up.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1924314/+subscriptions
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