Ceph » rgw

From Asish Singh:

• Description of problem:

Whenever the psuedo path contains an empty directory "//" (Example : s3://myfiles/new_data//new.pdf), accessing the files results in nfs-ganesha service aborting with SIGNAL 6.
In s3 namespace "//" is empty directory whereas in FS namespace "//" would be treated as "/" and not as an empty dir.

In 'audit.log' :
------
type=ANOM_ABEND msg=audit(1552413839.195:40148): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=system_u:system_r:ganesha_t:s0 pid=7325 comm="ganesha.nfsd" reason="memory violation" sig=6
------

In 'messages' :
------
Mar 12 23:42:30 ceph-a1 abrt-hook-ccpp: Process 8654 (ganesha.nfsd) of user 0 killed by SIGABRT - dumping core
Mar 12 23:42:35 ceph-a1 abrt-hook-ccpp: Failed to create core_backtrace: waitpid failed: No child processes
Mar 12 23:42:35 ceph-a1 systemd: nfs-ganesha.service: main process exited, code=killed, status=6/ABRT
Mar 12 23:42:35 ceph-a1 systemd: Unit nfs-ganesha.service entered failed state.
Mar 12 23:42:35 ceph-a1 systemd: nfs-ganesha.service failed.
------

• Version-Release number of selected component (if applicable):
  RHCS 3.2z1
  nfs-ganesha.x86_64-2.7.1-3.el7cp
  nfs-ganesha-rgw.x86_64-2.7.1-3.el7cp

• How reproducible:
  Always

• Steps to Reproduce:
  1. Create an s3 directory without any name and upload a file it it : # s3cmd put /bin/ceph s3://myfiles/new_data//new.pdf

2. Configure nfs-ganesha and mount the user to access bucket 'myfiles'. # mount -t nfs -o nfsvers=4.1,noauto,soft,sync,proto=tcp <IP>:/ /mnt

3. Try accessing the file under the directory without the name : # ls -l /mnt/myfiles/new_data//new.pdf

• Actual results:
  nfs-ganesha aborts with signal 6.

• Expected results:
  nfs-ganesha can error out and should handle it gracefully.

• Additional info:
  The name convention in s3 namespace is not correct and while using nfs-ganesha, we should make sure that Customer's do not have such directories without any name.
  The data isn't correct. However, nfs-ganesha shouldn't abort but should error out handle gracefully.