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Sun, 27 Jan 2019 14:32:08 -0800

Have had two or three more instances of this oom-killer behavior.  Today
we also had an incident where the system really DID run out of memory,
but oom-killer did not kick in.  I noticed the box being sluggish and
disk churning, so I started system monitor and watched it happen. One of
the firefox web containers was using up 11+ GB of memory. There was no
available core memory, no available swap, and pretty soon desktop froze.
Was unable to switch to a non-desktop pty or do anything, disk churning
away relentlessly. Waited a little while, and then used the reset button
on the box to reboot.

After that happened, we've installed upstream kernel and are running it
right now.

$> cat /proc/version 
Linux version 5.0.0-050000rc1-generic (kernel@tangerine) (gcc version 8.2.0 
(Ubuntu 8.2.0-12ubuntu1)) #201901062130 SMP Mon Jan 7 02:32:47 UTC 2019

So far, unable to induce an oom-killer anomaly.

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https://bugs.launchpad.net/bugs/1811093

Title:
  Bogus "Out of Memory" compiz invoked oom-killer

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  This has happened five times in the past week (four times in the past
  36 hours):

    kernel: compiz invoked oom-killer:

  There is plenty of free core memory and almost no swap in use when it
  happens.  This is Xenial with kernel version is 4.4.0-141, which
  contains fix to previously reported bug #1655842 "Out of Memory"
  oom-killer bug.  I only have one week of logs to go by, which contain
  five occurrences.  It has happened four times in the past 36 hours.
  Sometimes it happens right after logging into the unity / lighdm
  desktop (three out of five times), but not always.  In four out of
  five occurrences a postgres job was running and oom-killer killed
  postgres.  In the one other instance, postgres was quietly idle in the
  background and oom-killer killed Thunderbird.  Kernel messages in
  syslog from five occurrences:

  compiz invoked oom-killer: gfp_mask=0x24040c0, order=3, oom_score_adj=0
  compiz invoked oom-killer: gfp_mask=0x24040c0, order=3, oom_score_adj=0
  compiz invoked oom-killer: gfp_mask=0x24040c0, order=2, oom_score_adj=0
  compiz invoked oom-killer: gfp_mask=0x24040c0, order=2, oom_score_adj=0
  compiz invoked oom-killer: gfp_mask=0x24040c0, order=3, oom_score_adj=0

  Additional info:

  $> lsb_release -rd
  Description:  Ubuntu 16.04.5 LTS
  Release:      16.04

  $> cat /proc/version_signature
  Ubuntu 4.4.0-141.167-generic 4.4.162

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