[Bugs] [Bug 1550894] New: GD2 fails to dlopen server xlator

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1550894

            Bug ID: 1550894
           Summary: GD2 fails to dlopen server xlator
           Product: GlusterFS
           Version: 4.0
         Component: core
          Keywords: Triaged
          Severity: urgent
          Priority: urgent
          Assignee: kaushal at redhat.com
          Reporter: kaushal at redhat.com
                CC: bugs at gluster.org
            Blocks: 1539842 (glusterfs-4.0.0)



Description of problem:
GD2 fails to open the server xlator to read its options. This causes GD2 to
fail to start.

The reason for this is because, server xlator uses two external function from
glusterfsd, glusterfs_mgmt_pmap_signout and glusterfs_autoscale_threads. These
functions are not resolved when dlopen tries to load the xlator, causing it to
fail with 'undefined symbol' error.

This is not a problem with normal brick operation, as the server xlator is
loaded by glusterfsd, which already has the relevant symbols defined.


Version-Release number of selected component (if applicable):
4.0.0rc1

How reproducible:
Reproducible on packaged RPMs of GlusterFS-v4.0.0rc1 on Fedora and
GlusterD2-v4.0.0rc1 always.

Steps to Reproduce:
1. On Fedora 27, install GlusterFS-v4.0.0rc1 from [1] and GlusterD2-v4.0.0rc1
2. Start glusterd2.

Actual results:

GD2 fails to start with logged error,
```
FATA[2018-02-28 15:02:53.345686] Failed to load xlator options                
error="dlopen(/usr/lib64/glusterfs/4.0.0rc1/xlator/protocol/server.so) failed;
dlerror = /usr/lib64/glusterfs/4.0.0rc1/xlator/protocol/server.so: undefined
symbol: glusterfs_mgmt_pmap_signout" source="[main.go:79:main.main]"
```


Expected results:
GD2 should not fail to start.

Additional info:


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1539842
[Bug 1539842] GlusterFS 4.0.0 tracker
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