Public bug reported:
Ubuntu kernels should default transparent_hugepages to enabled=madvise,
not enabled=always
(this corresponds to TRANSPARENT_HUGEPAGE_MADVISE=y in .config).
I've blogged about this at some length here:
https://blog.nelhage.com/post/transparent-hugepages/ but here is a
summary
These patches have landed in v4.5rc3 squashed as
65376df582174ffcec9e6471bf5b0dd79ba05e4a (v4.5-rc3~15^2~9). Is that
sufficient, or should I reping once 4.5 final is out?
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htt
Public bug reported:
/proc/$pid/maps experienced a significant performance regression for
processes with large numbers of threads between Precise and Trusty due
to an upstream bug. This behavior is currently blocking my ability to
upgrade to Trusty, as we depend on applications with with 10s of
th
One more note to anyone else trying to debug this: I can reproduce quite
reliably by copying a 3GiB file from S3 onto a gp2 EBS volume using `aws
s3 cp`.
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Some further debugging: On my t2.micro test case, the machine comes up
with 9 memory devices, the last of which is offline at boot. Bringing
that device online by hand (with the udev rules disabled) triggers the
bug.
# echo online > /sys/devices/system/memory/memory8/state
So something about brin
I did some experimentation, and I can reproduce @oystein-gisnas's result
that nuking that file from `/lib/udev/rules.d/` and rebooting fixes the
issue.
However, removing that file and restarting udev does *not* seem to fix
the issue. So I suspect the problem is not with udev, but rather with
some
I may or may not have time to do the bisect any time soon, but based on
some log-diving, I strongly suspect
https://github.com/torvalds/linux/commit/013cdf1088d7235da9477a2375654921d9b9ba9f
or the related refactors of being the commit that introduced this
regression.
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Reproduced on
$ uname -a
Linux packer-vmware-iso 4.4.0-040400rc6-generic #201512202030 SMP Mon Dec 21
01:32:09 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
** Tags added: kernel-bug-exists-upstream kernel-bug-exists-upstream-4.4-rc6
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apport information
** Attachment added: "UdevLog.txt"
https://bugs.launchpad.net/bugs/1445664/+attachment/4539017/+files/UdevLog.txt
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https://bugs.launchpad.net/bugs/1445
apport information
** Attachment added: "WifiSyslog.txt"
https://bugs.launchpad.net/bugs/1445664/+attachment/4539018/+files/WifiSyslog.txt
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apport information
** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/1445664/+attachment/4539016/+files/UdevDb.txt
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apport information
** Attachment added: "ProcModules.txt"
https://bugs.launchpad.net/bugs/1445664/+attachment/4539015/+files/ProcModules.txt
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apport information
** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/1445664/+attachment/4539014/+files/ProcInterrupts.txt
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apport information
** Attachment added: "ProcCpuinfo.txt"
https://bugs.launchpad.net/bugs/1445664/+attachment/4539012/+files/ProcCpuinfo.txt
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apport information
** Attachment added: "Lspci.txt"
https://bugs.launchpad.net/bugs/1445664/+attachment/4539011/+files/Lspci.txt
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apport information
** Attachment added: "ProcEnviron.txt"
https://bugs.launchpad.net/bugs/1445664/+attachment/4539013/+files/ProcEnviron.txt
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apport information
** Attachment added: "CurrentDmesg.txt"
https://bugs.launchpad.net/bugs/1445664/+attachment/4539010/+files/CurrentDmesg.txt
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apport information
** Tags added: apport-collected trusty
** Description changed:
I have a development environment that uses Vagrant with NFS shares to a
Trusty development VM from OS X laptops.
After the upgrade to the HWE kernel 3.16, installing Ruby gems into the
NFS mount inside t
** Attachment added: "/proc/zoneinfo from the same machine"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1497428/+attachment/4529727/+files/zoneinfo.txt
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Hi @ddstreet, thanks for the update.
We unfortunately weren't able to reproduce this on your test kernel, and
have since moved to a newer kernel version for other reasons.
However, I can confirm that on the affected machine types, and only the
affected machine type, we see a memory range in `/pro
Hey,
We're also seeing this issue on a production system, and have been
around 1/week for a while now. We may be able to boot that test kernel
for experimentation purposes – would that still be useful?
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Public bug reported:
I have a development environment that uses Vagrant with NFS shares to a
Trusty development VM from OS X laptops.
After the upgrade to the HWE kernel 3.16, installing Ruby gems into the
NFS mount inside the VM failed because of install(1) failing with
permission errors. Debugg
To be clear, I can easily workaround in my environment by not using the
HWE kernel (there's no need for it inside a VM), but this is still a
regression that may affect other people and presumably future Ubuntu
releases.
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