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[Jelmer Vernooij <1116393@xxxxxxxxxxxxxxxxxx>]

This is a bug in the linux cifsfs kernel module.

** Package changed: cifs-utils (Ubuntu) => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1116393

Title:
  Navigating folders which include network shares in the folder
  structure can cause an application to freeze

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  The following is from Launchpad Questions:

  My CIFS network mount under Ubuntu 11.10 (Oneiric Ocelot) will freeze
  without much obvious reason. Idling for an extensive time is the only
  thing I can think of. Found many similar reports, eg:

  http://www.centos.org/modules/newbb/print.php?form=1&topic_id=35154&forum=55&order=ASC&start=0
  http://serverfault.com/questions/307636/virtualbox-running-fedora-15-keeps-losing-its-cifs-mount-of-a-windows-share

  My symptom is, I am able to mount the CIFS Network drive fine. I can
  write to it and read from it, for quite a while. The problem is that
  eventually the mount will become inaccessible from linux.

  When that happens I can't run ls /mnt/z. Even sudo umount -l
  /mnt/zdoesn't work. In fact, when I run those commands they lock up
  the shell in which they were run.

  dmesg gives the following error

  [   72.250743] CIFS VFS: default security mechanism requested.  The default security mechanism will be upgraded from ntlm to ntlmv2 in kernel release 3.1
  [  126.807829] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro,commit=0
  [  288.336825] hrtimer: interrupt took 4463392 ns
  [ 2036.256098] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro,commit=0
  [ 3622.991531] CIFS VFS: Server corpfs1 has not responded in 300 seconds. Reconnecting...
  [ 4722.294174] CIFS VFS: Unexpected lookup error -512
  [ 4782.585254] CIFS VFS: Unexpected lookup error -512
  [ 4855.705273] CIFS VFS: Unexpected lookup error -512

  The reason that I suspect that idling for an extensive time is the
  culprit is that I can see that the system seems to have recovered from
  some kind of sleep mode, and remounting my prime HD (sda1). But I'm
  not sure.

  Here are more info of my system:

  $ uname -rm
  3.0.0-17-generic x86_64

  $ modinfo /lib/modules/3.0.0-17-generic/kernel/fs/cifs/cifs.ko
  filename:       /lib/modules/3.0.0-17-generic/kernel/fs/cifs/cifs.ko
  version:        1.74
  . . .
  vermagic:       3.0.0-17-generic SMP mod_unload modversions

  The ubuntu is running under virtualbox on my Windows 7 machine. the
  network is always working on the Windows side.

  Just logging what I am experiencing, and understand that there may not be any solution.
  ------------------------------------------------------------------------------------------

  My own experience is that when downloading files using Opera and
  trying to navigate the file system in order to find the directory in
  which I wish to save the file, freezes Opera. If I try to open or save
  a file using a text editor, say gVim, then a similar problem is
  encountered. The freeze doesn't happen every time. I can't seem to
  work out why I experience a freeze only some of the time. Any freeze
  may last several minutes.

  I am only seeing this with Kubuntu 12.10 and 13.04. I did  not see
  this with Ubuntu/Kubuntu 12.04.

  Disconnecting my NAS drive allows me to open and save files to any
  directory without any freezing at all.

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