[Bug 1768778] [NEW] "mount -a" mounts cifs shares multiple times

[Peet Whittaker]

Public bug reported:

This is pretty much a duplicate of this report: https://bugs.debian.org
/cgi-bin/bugreport.cgi?bug=589218

Output of 'grep "cifs" /etc/fstab':

//network/path  /mnt/backups  cifs
dom=xyz,username=xyz,password=xyz,iocharset=utf8,sec=ntlm,vers=3.0  0  0

If I run 'mount -a' and then 'grep "cifs" /etc/mtab' I see 1 entry:

//network/path /mnt/backups cifs
rw,relatime,vers=3.0,sec=ntlmssp,cache=strict,username=xyz,domain=xyz,uid=0,noforceuid,gid=0,noforcegid,addr=10.0.0.238,file_mode=0755,dir_mode=0755,nounix,serverino,mapposix,rsize=1048576,wsize=1048576,echo_interval=60,actimeo=1
0 0

However, if I then re-run 'mount -a' and 'grep "cifs" /etc/mtab' I then
see 2 (duplicated) entries:

//network/path /mnt/backups cifs rw,relatime,vers=3.0,sec=ntlmssp,cache=strict,username=xyz,domain=xyz,uid=0,noforceuid,gid=0,noforcegid,addr=10.0.0.238,file_mode=0755,dir_mode=0755,nounix,serverino,mapposix,rsize=1048576,wsize=1048576,echo_interval=60,actimeo=1 0 0
//network/path /mnt/backups cifs rw,relatime,vers=3.0,sec=ntlmssp,cache=strict,username=xyz,domain=xyz,uid=0,noforceuid,gid=0,noforcegid,addr=10.0.0.238,file_mode=0755,dir_mode=0755,nounix,serverino,mapposix,rsize=1048576,wsize=1048576,echo_interval=60,actimeo=1 0 0

Running 'mount -a' further times just adds additional duplicate entries
into etc/mtab.

This means that in order to un-mount the folder, I have to run 'umount
/mnt/backups' multiple times (as many times as it is duplicated in
/etc/mtab to be precise).

Adding a trailing slash to the remote network path (i.e.
//network/path/) as suggested in the linked bug report makes no
difference (I still get duplicated entries in /etc/mtab).

-- SYSTEM INFO --

Description:    Ubuntu 16.04.4 LTS
Release:        16.04

Linux 4.4.0-122-generic #146-Ubuntu SMP Mon Apr 23 15:34:04 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux

cifs-utils:
  Installed: 2:6.4-1ubuntu1.1
  Candidate: 2:6.4-1ubuntu1.1
  Version table:
 *** 2:6.4-1ubuntu1.1 500
        500 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     2:6.4-1ubuntu1 500
        500 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

** Affects: cifs-utils (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1768778

Title:
  "mount -a" mounts cifs shares multiple times

Status in cifs-utils package in Ubuntu:
  New

Bug description:
  This is pretty much a duplicate of this report:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=589218

  Output of 'grep "cifs" /etc/fstab':

  //network/path  /mnt/backups  cifs
  dom=xyz,username=xyz,password=xyz,iocharset=utf8,sec=ntlm,vers=3.0  0
  0

  If I run 'mount -a' and then 'grep "cifs" /etc/mtab' I see 1 entry:

  //network/path /mnt/backups cifs
  rw,relatime,vers=3.0,sec=ntlmssp,cache=strict,username=xyz,domain=xyz,uid=0,noforceuid,gid=0,noforcegid,addr=10.0.0.238,file_mode=0755,dir_mode=0755,nounix,serverino,mapposix,rsize=1048576,wsize=1048576,echo_interval=60,actimeo=1
  0 0

  However, if I then re-run 'mount -a' and 'grep "cifs" /etc/mtab' I
  then see 2 (duplicated) entries:

  //network/path /mnt/backups cifs rw,relatime,vers=3.0,sec=ntlmssp,cache=strict,username=xyz,domain=xyz,uid=0,noforceuid,gid=0,noforcegid,addr=10.0.0.238,file_mode=0755,dir_mode=0755,nounix,serverino,mapposix,rsize=1048576,wsize=1048576,echo_interval=60,actimeo=1 0 0
  //network/path /mnt/backups cifs rw,relatime,vers=3.0,sec=ntlmssp,cache=strict,username=xyz,domain=xyz,uid=0,noforceuid,gid=0,noforcegid,addr=10.0.0.238,file_mode=0755,dir_mode=0755,nounix,serverino,mapposix,rsize=1048576,wsize=1048576,echo_interval=60,actimeo=1 0 0

  Running 'mount -a' further times just adds additional duplicate
  entries into etc/mtab.

  This means that in order to un-mount the folder, I have to run 'umount
  /mnt/backups' multiple times (as many times as it is duplicated in
  /etc/mtab to be precise).

  Adding a trailing slash to the remote network path (i.e.
  //network/path/) as suggested in the linked bug report makes no
  difference (I still get duplicated entries in /etc/mtab).

  -- SYSTEM INFO --

  Description:    Ubuntu 16.04.4 LTS
  Release:        16.04

  Linux 4.4.0-122-generic #146-Ubuntu SMP Mon Apr 23 15:34:04 UTC 2018
  x86_64 x86_64 x86_64 GNU/Linux

  cifs-utils:
    Installed: 2:6.4-1ubuntu1.1
    Candidate: 2:6.4-1ubuntu1.1
    Version table:
   *** 2:6.4-1ubuntu1.1 500
          500 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       2:6.4-1ubuntu1 500
          500 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

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