Description of problem:

mount fails silently (return code 0, nothing reported) under certain error conditions.

The particular condition which reproduces this was where a client machine wrongly had 3.2.5 installed, and was trying to talk to a 3.3.1 server. If you look in gluster client logs, you see "XDR decoding error".

However the mount command showed no error, and the return code from mount was 0, so there was no indication of any problem (except that the mount didn't actually take place of course)

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

Linux ar48 3.2.0-34-generic #53-Ubuntu SMP Thu Nov 15 10:48:16 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
Ubuntu 12.04 LTS x86_64
client: glusterfs-3.2.5 from Ubuntu repo
server: glusterfs-3.3.1 from semiosis PPA

How reproducible:

100%

Steps to Reproduce:
1. configure server running glusterfs-3.3.1
2. configure client with glusterfs-3.2.5
3. mount -t glusterfs server1:/data /gluster/data
  
Actual results:

mount returns to the command line, echo $? shows 0

Expected results:

Error message to be displayed, and echo $? to show value >0

Additional info:

$ tail /var/log/glusterfs/gluster-data.log 
...
[2012-12-11 10:37:18.18194] I [glusterfsd.c:1493:main] 0-/usr/sbin/glusterfs: Started running /usr/sbin/glusterfs version 3.2.5
[2012-12-11 10:37:18.40878] E [glusterfsd-mgmt.c:621:mgmt_getspec_cbk] 0-glusterfs: XDR decoding error
[2012-12-11 10:37:18.40932] E [glusterfsd-mgmt.c:695:mgmt_getspec_cbk] 0-mgmt: failed to fetch volume file (key:/data)
[2012-12-11 10:37:18.41051] W [glusterfsd.c:727:cleanup_and_exit] (-->/usr/lib/libgfrpc.so.0(rpc_clnt_notify+0x7d) [0x7f2856e5084d] (-->/usr/lib/libgfrpc.so.0(rpc_clnt_handle_reply+0xa5) [0x7f2856e4fec5] (-->/usr/sbin/glusterfs(mgmt_getspec_cbk+0x2fd) [0x7f28574e7e3d]))) 0-: received signum (0), shutting down
[2012-12-11 10:37:18.41074] I [fuse-bridge.c:3727:fini] 0-fuse: Unmounting '/gluster/data'.