Tested Ubuntu 4.4.0-63.84-generic 4.4.44 on a desktop system with a
workload which previously led to Chrome processes being OOM-killed.
Situation with 4.4.0-62-generic: between 8 and 54 processes OOM-killed per
24-hour period
Situation with 4.4.0-63-generic: no OOM-kills during 46 hours of
** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial
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https://bugs.launchpad.net/bugs/1655842
Title:
"Out of memory" errors after upgrade to
Testing...
Enabled proposed (https://wiki.ubuntu.com/Testing/EnableProposed).
Installed kernel packages:
# apt-get install -s -t xenial-proposed 'linux-headers-4.4.0.63$'
'linux-headers-4.4.0.63-generic$' 'linux-image-4.4.0.63-generic$'
'linux-image-extra-4.4.0.63-generic$'
Rebooted.
# cat
Verified with the test script of #5. Kernel in -proposed solves the
problem.
Steps used:
1. Verified that release kernel 4.4.0-24-generic still had the problem.
2. Verified that kernel 4.4.0.25 from -proposed contains the resolution:
# apt-get install -s -t xenial-proposed
Hope the SRU will be accepted quickly. Should be the case, since this
issue causes loss of user data as applications will have no reason to
retry files writes under out of space conditions.
Thanks for the quick and professional cooperation!
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Another 24 error-free hours on the server with the test kernel running
the MySQL/Icinga2 combination and creating btrfs snapshots every 5
minutes.
I'd like to add that this server, which previously experienced frequent false
ENOSPC conditions with the Xenial release kernel, used a fairly plain
The Xenial test kernel with a pick of 4da2e26 resolves the bug, no
negative side effects were encountered.
With the Xenial release kernel, there were 18 MySQL server crashes in a
24 hour period due to false ENOSPC indications. With the test kernel,
not a single crash occured in a 24 hour period.
I have now installed the kernel image on a server which previously
experienced MySQL crashes every 1 to 2 hours. The server uses MySQL for
an Icinga2 monitoring database (so it's frequently writing) and is
configured to create btrfs snapshots every 5 minutes.
# cat /proc/version
Linux version
There is no matching report in /var/crash. The bug is already diagnosed
and fixed upstream, and may be reproduced with the information provided
in https://patchwork.kernel.org/patch/7967161/
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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You received this bug
Public bug reported:
Kernel 4.4 introduced a btrfs bug where a process writing a file while a
snapshot creation is underway will receive a false ENOSPC error (No
space left on device), even while there is plenty of free space on the
file system. On systems where snapshots are created frequently,
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