Public bug reported: 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 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. ** Affects: linux-gcp (Ubuntu) Importance: Undecided Status: New ** Affects: linux-gcp (Ubuntu Bionic) Importance: Undecided Status: New ** Also affects: linux-gcp (Ubuntu Bionic) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1819504 Title: tcmu user space crash results in kernel module hang. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-gcp/+bug/1819504/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
