Description of problem:
Mount process hangs if the remote file server is unavailable.

Version-Release number of selected component (if applicable):
3.12.6 and 3.8.13

How reproducible:
I can only reproduce this in our production environment and it happens 100% of the time there.  Every testing environment i've tried works as expected.


Steps to Reproduce:
1. mount -t glusterfs glusterfs.example.com:/volume-name /mnt/test


Actual results:
Process hangs and has to be sent a SIGKILL.


Expected results:
Process ends and returns "Mount failed. Please check the log file for more details"


Additional info:
Log information

[2018-09-07 19:56:06.533943] E [MSGID: 101075] [common-utils.c:294:gf_resolve_ip6] 0-resolver: getaddrinfo failed (Name or service not known)
[2018-09-07 19:56:06.534061] E [name.c:262:af_inet_client_get_remote_sockaddr] 0-glusterfs: DNS resolution failed on host glusterfs.example.com
[2018-09-07 19:56:06.535370] I [timer.c:212:gf_timer_registry_init] (-->/usr/lib64/libglusterfs.so.0(+0x36bb6) [0x7fba8ad51bb6] -->/usr/lib64/libgfrpc.so.0(rpc_clnt_reconnect+0x11f) [0x7fba8ab0f56f] -->/usr/lib64/libglusterfs.so.0(gf_timer_call_after+0x238) [0x7fba8ad51958] ) 0-timer: ctx cleanup started
[2018-09-07 19:56:06.535587] E [timer.c:44:gf_timer_call_after] (-->/usr/lib64/libglusterfs.so.0(+0x36bb6) [0x7fba8ad51bb6] -->/usr/lib64/libgfrpc.so.0(rpc_clnt_reconnect+0x11f) [0x7fba8ab0f56f] -->/usr/lib64/libglusterfs.so.0(gf_timer_call_after+0x280) [0x7fba8ad519a0] ) 0-timer: !reg
[2018-09-07 19:56:06.535777] E [rpc-clnt.c:433:rpc_clnt_reconnect] 0-glusterfs: Error adding to timer event queue


OS is Centos6.6