** Also affects: linux (Ubuntu Utopic)
Importance: High
Assignee: Tim Gardner (timg-tpi)
Status: Fix Committed
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https://bugs.launchpad.net/bugs/1309221
Title:
transparent hugepages flaky on arm64
Status in “linux” package in Ubuntu:
Fix Committed
Status in “linux” source package in Trusty:
Fix Committed
Status in “linux” source package in Utopic:
Fix Committed
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://comments.gmane.org/gmane.linux.ports.arm.kernel/299268
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.
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