Description of problem:
=======================
on a 2x(4+2) ec volume with all the md-cache settings enabled,
I brought down some bricks using forceful umount of the bricks,
I did bring up all the bricks up, however
After some iterations, while doing ls -l on the fuse mount, I hit the below error messages consistently during that period(i hit it about 5 times)

One thing to note was i saw root of the volume "/" requiring heal(as shown in heal info) when there were no actual changes or writes to the data

create about 50000 file of size 1KB on root and about 40K file of 1KB size in a directory test under the root


Was running "time ls -lt test/file.*"


[2016-12-13 06:52:44.402952] W [MSGID: 122002] [ec-common.c:71:ec_heal_report] 0-disperse-disperse-0: Heal failed [Transport endpoint is not connected]
[2016-12-13 06:52:44.403859] W [MSGID: 122053] [ec-common.c:116:ec_check_status] 0-disperse-disperse-0: Operation failed on some subvolumes (up=3F, mask=3F, remaining=0
, good=1F, bad=20)
The message "W [MSGID: 114031] [client-rpc-fops.c:2938:client3_3_lookup_cbk] 0-disperse-client-5: remote operation failed. Path: / (00000000-0000-0000-0000-000000000001
) [No such file or directory]" repeated 4 times between [2016-12-13 06:52:44.371681] and [2016-12-13 06:52:44.403964]
[2016-12-13 06:52:44.406021] W [MSGID: 122002] [ec-common.c:71:ec_heal_report] 0-disperse-disperse-0: Heal failed [Transport endpoint is not connected]
[2016-12-13 06:52:44.421467] W [MSGID: 114031] [client-rpc-fops.c:2938:client3_3_lookup_cbk] 0-disperse-client-5: remote operation failed. Path: / (00000000-0000-0000-0
000-000000000001) [No such file or directory]
[2016-12-13 06:52:44.442641] W [MSGID: 114063] [client-callback.c:110:client_cbk_cache_invalidation] 0-disperse-client-3: XDR decode of cache_invalidation failed. [Operation not permitted]
[2016-12-13 06:52:44.442720] E [socket.c:1989:__socket_read_frag] 0-rpc: wrong MSG-TYPE (22) received from 10.70.35.135:49154
[2016-12-13 06:52:44.442948] E [rpc-clnt.c:365:saved_frames_unwind] (--> /lib64/libglusterfs.so.0(_gf_log_callingfn+0x192)[0x7f4812dcc682] (--> /lib64/libgfrpc.so.0(saved_frames_unwind+0x1de)[0x7f4812b9275e] (--> /lib64/libgfrpc.so.0(saved_frames_destroy+0xe)[0x7f4812b9286e] (--> /lib64/libgfrpc.so.0(rpc_clnt_connection_cleanup+0x84)[0x7f4812b93fd4] (--> /lib64/libgfrpc.so.0(rpc_clnt_notify+0x94)[0x7f4812b94864] ))))) 0-disperse-client-3: forced unwinding frame type(GlusterFS 3.3) op(INODELK(29)) called at 2016-12-13 06:52:44.422872 (xid=0x1b92db)
[2016-12-13 06:52:44.442974] E [MSGID: 114031] [client-rpc-fops.c:1550:client3_3_inodelk_cbk] 0-disperse-client-3: remote operation failed [Transport endpoint is not connected]




However I am not able to reproduce after about 3 hours


Brick error logs on one of the nodes was as below, when the fuse errors were hit


[2016-12-13 07:34:48.825529] E [rpcsvc.c:1304:rpcsvc_submit_generic] 0-rpc-service: failed to submit message (XID: 0x20807a, Program: GlusterFS 3.3, ProgVers: 330, Proc: 40) to rpc-transport (tcp.disperse-server)
<nag> [2016-12-13 07:34:48.826196] E [server.c:202:server_submit_reply] (-->/usr/lib64/glusterfs/3.8.4/xlator/debug/io-stats.so(+0x12881) [0x7f6ed95af881] -->/usr/lib64/glusterfs/3.8.4/xlator/protocol/server.so(+0x21907) [0x7f6ed915e907] -->/usr/lib64/glusterfs/3.8.4/xlator/protocol/server.so(+0x9186) [0x7f6ed9146186] ) 0-: Reply submission failed



Version-Release number of selected component (if applicable):
=========
3.8.4-8