+++ This bug was initially created as a clone of Bug #1722131 +++

Description of problem:
During In-service upgrade, glusterd on upgraded node crashed with a backtrace, when 'gluster vol status' command is issued from non-upgraded nodes.
Upgrade scenario is from glusterfs-5 or lower to glusterfs-6


Version-Release number of selected component (if applicable):
glusterfs 5 to glusterfs 6 upgrade

How reproducible:
3/3

Steps to Reproduce:
1. On three nodes cluster(N1, N2, N3), Create 2020 volumes of replicate(1X3) and started them (Brick-mux enabled)
2. Mounted 3 volumes and running continuous IO from 3 different clients.
3. Upgraded node N1.
4. While heal is going on node N1, Ran 'gluster volume status' on node N2 which is yet to upgrade.
 

Actual results:
glusterd crashed with a backtrace no backtrace seen. 

[2019-06-19 11:13:56.506826] I [MSGID: 106499] [glusterd-handler.c:4497:__glusterd_handle_status_volume] 0-management: Received status volume req for volume testvol_-997
[2019-06-19 11:13:56.512662] I [MSGID: 106499] [glusterd-handler.c:4497:__glusterd_handle_status_volume] 0-management: Received status volume req for volume testvol_-998
[2019-06-19 11:13:56.518409] I [MSGID: 106499] [glusterd-handler.c:4497:__glusterd_handle_status_volume] 0-management: Received status volume req for volume testvol_-999
[2019-06-19 11:14:37.732442] E [MSGID: 101005] [dict.c:2852:dict_serialized_length_lk] 0-dict: value->len (-1162167622) < 0 [Invalid argument]
[2019-06-19 11:14:37.732483] E [MSGID: 106130] [glusterd-handler.c:2633:glusterd_op_commit_send_resp] 0-management: failed to get serialized length of dict
pending frames:
frame : type(0) op(0)
patchset: git://git.gluster.org/glusterfs.git
signal received: 11
time of crash: 
2019-06-19 11:14:37
configuration details:
argp 1
backtrace 1
dlfcn 1
libpthread 1
llistxattr 1
setfsid 1
spinlock 1
epoll.h 1
xattr.h 1
st_atim.tv_nsec 1
package-string: glusterfs 6.0
/lib64/libglusterfs.so.0(+0x27240)[0x7f7b5c38a240]
/lib64/libglusterfs.so.0(gf_print_trace+0x334)[0x7f7b5c394c64]
/lib64/libc.so.6(+0x363f0)[0x7f7b5a9c63f0]
/lib64/libpthread.so.0(pthread_mutex_lock+0x0)[0x7f7b5b1cad00]
/lib64/libglusterfs.so.0(__gf_free+0x12c)[0x7f7b5c3b64cc]
/lib64/libglusterfs.so.0(+0x1b889)[0x7f7b5c37e889]
/usr/lib64/glusterfs/6.0/xlator/mgmt/glusterd.so(+0x478f8)[0x7f7b504c58f8]
/usr/lib64/glusterfs/6.0/xlator/mgmt/glusterd.so(+0x44514)[0x7f7b504c2514]
/usr/lib64/glusterfs/6.0/xlator/mgmt/glusterd.so(+0x1d19e)[0x7f7b5049b19e]
/usr/lib64/glusterfs/6.0/xlator/mgmt/glusterd.so(+0x24dce)[0x7f7b504a2dce]
/lib64/libglusterfs.so.0(+0x66610)[0x7f7b5c3c9610]
/lib64/libc.so.6(+0x48180)[0x7f7b5a9d8180]
---------

Expected results:
glusterd should not crash