** Changed in: linux (Ubuntu)
Status: Incomplete => Fix Released
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https://bugs.launchpad.net/bugs/1819504
Title:
tcmu user space crash results in kernel module hang.
Status in linux package in Ubuntu:
Fix Released
Status in linux-gcp package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Released
Status in linux-gcp source package in Bionic:
Fix Released
Status in linux source package in Cosmic:
Fix Released
Status in linux-gcp source package in Cosmic:
Fix Released
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.
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