** Changed in: linux-azure-4.15 (Ubuntu Bionic)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Invalid
** Changed in: linux (Ubuntu Bionic)
Assignee: Tim Gardner (timg-tpi) => (unassigned)
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
Invalid
Status in linux-azure-4.15 source package in Bionic:
Fix Committed
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
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : [email protected]
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
