This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed- bionic'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-bionic -- 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 : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
