transparent hugepages flaky on arm64 and armhf
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
High
|
Tim Gardner | ||
Trusty |
Fix Released
|
High
|
Tim Gardner | ||
Utopic |
Fix Released
|
High
|
Tim Gardner |
Bug Description
linux 3.13.0-24.46
transparent hugepages, which are configured on by default in Ubuntu, are flaky on arm64. The most evident system is that go processes reliably hang or crash. This has been observed with both building juju-core with gccgo, and running the resulting juju binaries.
The root cause of this is that get_user_pages_fast is not yet implemented on arm64 (and arm64). Patches are floating around, but haven't landed.
http://
We've verified that either applying those patches, or disabling THP via sysfs, prevents the above issues.
At minimum we should change the default boottime sysfs setting for THP to "never" until we can fix this feature properly.
Changed in linux (Ubuntu): | |
importance: | Undecided → High |
tags: | added: kernel-da-key trusty |
Changed in linux (Ubuntu Utopic): | |
status: | Fix Committed → Confirmed |
summary: |
- transparent hugepages flaky on arm64 + transparent hugepages flaky on arm64 and armhf |
Changed in linux (Ubuntu Utopic): | |
status: | Confirmed → In Progress |
This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:
apport-collect 1309221
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.