[Bugs] [Bug 1541930] New: A down brick is incorrectly considered to be online and makes the volume to be started without any brick available

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1541930

            Bug ID: 1541930
           Summary: A down brick is incorrectly considered to be online
                    and makes the volume to be started without any brick
                    available
           Product: GlusterFS
           Version: 3.12
         Component: replicate
          Assignee: bugs at gluster.org
          Reporter: jahernan at redhat.com
                CC: bugs at gluster.org
        Depends On: 1541038
            Blocks: 1541928, 1541929



+++ This bug was initially created as a clone of Bug #1541038 +++

Description of problem:

In a replica 2 volume, if one of the bricks is down and it reports its state
before the online one, AFR tries to find another online brick in
find_best_down_child(). Since priv->child_up array has been initialized with -1
and this function only checks if it's 0, it considers that the other brick is
alive and sends a CHILD_UP notification.

At this point the other xlators start sending requests, which fail with
ENOTCONN when they reach afr. This can cause several unexpected errors.

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


How reproducible:

It happens randomly, depending on the order in which bricks are started.

Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1541038
[Bug 1541038] A down brick is incorrectly considered to be online and makes
the volume to be started without any brick available
https://bugzilla.redhat.com/show_bug.cgi?id=1541928
[Bug 1541928] A down brick is incorrectly considered to be online and makes
the volume to be started without any brick available
https://bugzilla.redhat.com/show_bug.cgi?id=1541929
[Bug 1541929] A down brick is incorrectly considered to be online and makes
the volume to be started without any brick available
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