stat calls on gluster mounts lockups the system

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Hi!

I have been using glusterfs since years, mainly without severe problems.

Now I have encountered a very strange behaviour, I cannot handle myself.

Run Ubuntu 14.04s in AWS.
Bricks are on EBS, replication peers are in different availability zones.

In many cases this works like charm, no problam et all, but teher's one pair of inctances just cannot setup correctly. 

Peers are connected, everithing looks fine, I can reach the mounted resources, sync works two ways.

The problem is, that applications like df, or even commandline substituion (pressingTAB) on the parent of the mount point locks up. Forever...

I can reach my data,manipulate files, if I know the exact file names.

This applies on dirs as well:

root@control2:~# ls -ltr /mnt/glu-control-share/salt
total 12
drwxrwxr-x 10 ubuntu ubuntu 4096 Jan 14  2015 xxxxxx-pillar
lrwxrwxrwx  1 root   root     29 Jan 14  2015 pillar -> xxxxxx-pillar/aws-pillar
drwxrwxr-x 25 ubuntu ubuntu 4096 Jan 16  2015 xxxxxx-saltstack
drwxrwxr-x 18 ubuntu ubuntu 4096 Jan 23  2015 states


"ls /mnt" hangs forever

mount is 
127.0.0.1:/control-share on /mnt/glu-control-share type fuse.glusterfs (rw,default_permissions,allow_other,max_read=131072)

fstab:
127.0.0.1:/control-share /mnt/glu-control-share glusterfs defaults,_netdev 0 0

heidricha@aldev-control1:~$ dpkg -l|grep gluster
ii  glusterfs-client                  3.7.5-ubuntu1~trusty1               amd64        clustered file-system (client package)
ii  glusterfs-common                  3.7.5-ubuntu1~trusty1               amd64        GlusterFS common libraries and translator modules
ii  glusterfs-server                  3.7.5-ubuntu1~trusty1               amd64        clustered file-system (server package)

heidricha@aldev-control1:~$ sudo gluster peer status
[sudo] password for heidricha: 
Number of Peers: 1

Hostname: 172.16.2.10
Uuid: f6cc9444-6221-446d-be4e-4af9e93d15ba
State: Peer in Cluster (Connected)
heidricha@aldev-control1:~$ sudo gluster peer status
Number of Peers: 1

Hostname: 172.16.2.10
Uuid: f6cc9444-6221-446d-be4e-4af9e93d15ba
State: Peer in Cluster (Connected)

heidricha@aldev-control1:~$ sudo gluster volume info
 
Volume Name: control-share
Type: Replicate
Volume ID: ef80c184-4255-40a5-bfa3-faa0b69c334c
Status: Started
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: 172.16.1.10:/mnt/ebs-lv-data/shared
Brick2: 172.16.2.10:/mnt/ebs-lv-data/shared
Options Reconfigured:
performance.readdir-ahead: on
nfs.disable: on

heidricha@aldev-control1:~$ sudo gluster volume status
Status of volume: control-share
Gluster process                             TCP Port  RDMA Port  Online  Pid
------------------------------------------------------------------------------
Brick 172.16.1.10:/mnt/ebs-lv-data/shared   49152     0          Y       2771 
Brick 172.16.2.10:/mnt/ebs-lv-data/shared   49152     0          Y       1690 
Self-heal Daemon on localhost               N/A       N/A        Y       2762 
Self-heal Daemon on 172.16.2.10             N/A       N/A        Y       1682 
 
Task Status of Volume control-share
------------------------------------------------------------------------------
There are no active volume tasks

Where to look for the problem?

Attila
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