This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1819504 and then change the status of the bug to 'Confirmed'. If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'. This change has been made by an automated script, maintained by the Ubuntu Kernel Team. ** Changed in: linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-gcp in Ubuntu. https://bugs.launchpad.net/bugs/1819504 Title: tcmu user space crash results in kernel module hang. Status in linux package in Ubuntu: Incomplete Status in linux-gcp package in Ubuntu: Invalid Status in linux source package in Bionic: In Progress Status in linux-gcp source package in Bionic: In Progress Bug description: With the 4.15.0 kernel version used in bionic GCP/GKE, if the tcmu user space code crashes while handling a netlink message from the kernel, the kernel module will be stuck waiting for the response. This situation can only be resolved with a server reboot. === SRU Justification === [Impact] With this particular user-space crash in the current Ubuntu image it results in a hang hobbles the entire physical server. [Fix] The request is for Canonical to backport the patch https://patchwork.kernel.org/patch/10319623/ to the bionic 4.15.0 kernel [** CORRECTION: See comment #2 ***] There were a number of mainline upstream commits to apply as part of the backport [Test] unavailable [Regression Potential] Low. it's all mainline commits, and affects only that driver. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1819504/+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