So far, no oom-killer problems with Xenial HWE in production.  Newer
kernel (Ubuntu 4.15.0-43.46~16.04.1-generic 4.15.18).  Not sure if it
matters, but still using the proprietary Nvidia driver, but it may be a
newer version.  Same version of compiz (0.9.12.3).

If you do not hear from us further, Xenial HWE channel solved the
problem.

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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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