[Bug 1262329] [NEW] Large file read errors with cifs

[Peter Jones]

Public bug reported:

This relates to reading files from a Netgear NAS server on a local
network. I am running on a desktop PC, originally with ubuntu 12.x
subsequently updated to 13.10.

Under 12.x I mounted sections of the NAS server as Windows shares using
samba and everything worked fine.

When I upgraded to 13.10 (via 13.04?) I found that the NAS was not
mounting. On investigation I found that samba was no longer supported
and that I should use cifs. The was no warning that this was going to
happen before or during the upgrade.

The shares mounted  OK and things were fine with normal docs. However
with photos and large files reading failed with errors like
'Input/output error". Transfers were fine on other pcs connected to the
NAS server. The error occurs both with nautilus and cp in a bash shell.
Sometime it is OK on a reboot but soon becomes corrupt.

On searching for possible solutions there seemed to be one possibility
related to 'optimistic locking' but I could not make it work.

The mount instructions in /etc/fstab are of the form:

//nas1/photos /media/photos_nas1 cifs sec=ntlm,credentials=/home/peter/.nas1cred
entials,uid=1000,gid=1000,cache=none

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

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https://bugs.launchpad.net/bugs/1262329

Title:
  Large file read errors with cifs

Status in “cifs-utils” package in Ubuntu:
  New

Bug description:
  This relates to reading files from a Netgear NAS server on a local
  network. I am running on a desktop PC, originally with ubuntu 12.x
  subsequently updated to 13.10.

  Under 12.x I mounted sections of the NAS server as Windows shares
  using samba and everything worked fine.

  When I upgraded to 13.10 (via 13.04?) I found that the NAS was not
  mounting. On investigation I found that samba was no longer supported
  and that I should use cifs. The was no warning that this was going to
  happen before or during the upgrade.

  The shares mounted  OK and things were fine with normal docs. However
  with photos and large files reading failed with errors like
  'Input/output error". Transfers were fine on other pcs connected to
  the NAS server. The error occurs both with nautilus and cp in a bash
  shell. Sometime it is OK on a reboot but soon becomes corrupt.

  On searching for possible solutions there seemed to be one possibility
  related to 'optimistic locking' but I could not make it work.

  The mount instructions in /etc/fstab are of the form:

  //nas1/photos /media/photos_nas1 cifs sec=ntlm,credentials=/home/peter/.nas1cred
  entials,uid=1000,gid=1000,cache=none

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