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Message #55634
[Bug 1309221] [NEW] transparent hugepages flaky on arm64
Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1309221
Title:
transparent hugepages flaky on arm64
Status in “linux” package in Ubuntu:
New
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1309221/+subscriptions
Follow ups
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[Bug 1309221] Re: transparent hugepages flaky on arm64 and armhf
From: Launchpad Bug Tracker, 2014-10-11
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[Bug 1309221] Re: transparent hugepages flaky on arm64 and armhf
From: dann frazier, 2014-10-08
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[Bug 1309221] Re: transparent hugepages flaky on arm64 and armhf
From: dann frazier, 2014-10-08
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[Bug 1309221] Re: transparent hugepages flaky on arm64
From: dann frazier, 2014-08-26
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[Bug 1309221] Re: transparent hugepages flaky on arm64
From: Launchpad Bug Tracker, 2014-05-26
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[Bug 1309221] Re: transparent hugepages flaky on arm64
From: Tim Gardner, 2014-05-13
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[Bug 1309221] Re: transparent hugepages flaky on arm64
From: dann frazier, 2014-05-13
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[Bug 1309221] Re: transparent hugepages flaky on arm64
From: Brad Figg, 2014-05-13
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[Bug 1309221] Re: transparent hugepages flaky on arm64
From: Launchpad Bug Tracker, 2014-04-22
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[Bug 1309221] Re: transparent hugepages flaky on arm64
From: Tim Gardner, 2014-04-18
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[Bug 1309221] Re: transparent hugepages flaky on arm64
From: Joseph Salisbury, 2014-04-18
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[Bug 1309221] Re: transparent hugepages flaky on arm64
From: Joseph Salisbury, 2014-04-17
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[Bug 1309221] Missing required logs.
From: Brad Figg, 2014-04-17
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[Bug 1309221] [NEW] transparent hugepages flaky on arm64
From: dann frazier, 2014-04-17
References