[Bugs] [Bug 1613512] New: Backport glusterfs-client memory leak fix to 3.12.x

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1613512

            Bug ID: 1613512
           Summary: Backport glusterfs-client memory leak fix to 3.12.x
           Product: GlusterFS
           Version: 3.12
         Component: glusterd
          Severity: high
          Assignee: bugs at gluster.org
          Reporter: totalworlddomination at gmail.com
                CC: bugs at gluster.org
   External Bug ID: Red Hat Bugzilla 1593826



Description of problem:

For the past 1-2 weeks, we've experienced major memory leaks in the
glusterfs-client, resulting in glusterfs consuming whatever RAM is available
until the machine dies.

Version-Release number of selected component (if applicable):

glusterfs-client 3.12.12-ubuntu1~xenial1

How reproducible:

Leave a k8s pod running with a small MySQL database and over a few days the
associated glusterfs mount will grown to use all the free RAM.

Steps to Reproduce:

The bug has apparently been spotted and a patch committed:

https://bugzilla.redhat.com/show_bug.cgi?id=1593826#c24

https://review.gluster.org/#/c/20437/

Actual results:

Consuming ram until it OOM or kills the machine.

Expected results:

Consume a normal amount of RAM according to the configured cache performance
flags.

Additional info:

As suggested, I'm opening this issue to track a backport of the 
  Change-Id: If4cc4c2db075221b9ed731bacb7cc035f7007c5b back into 3.12.x branch.

Cheers!

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