[Bug 1152186] [NEW] possible fuse crash and inaccessible mounted filesystem

[mosteo]

Public bug reported:

I use heavily encfs and sshfs filesystems. Since 12.10 I observe
regularly that mounted filesystems go awry but remain mounted, and files
within them are not accessible. The obvious symptom is listing the
folder in which they're mounted. In the following example an encfs is
mounted in a folder named 'dropbox':

$ ls -lF
ls: cannot access dropbox: Transport endpoint is not connected
total 16K
d????????? ? ?    ?       ?            ? dropbox/
-rwxr-xr-x 1 jano jano  937 mar  6 10:39 fixlinks*

There is the dropbox folder and the the regular file fixlinks, for
comparison, which is in the same folder.

Sometimes the folder can be unmounted simply with sudo umount <folder>,
others it is necessary to use -l (lazy unmount).

I suspected encfs could be responsible, until I saw this with a sshfs
filesystem. Still, I've been able to locate any log or crash message to
confirm that fuse is the culprit. Any indications on how to debug this
further are welcome.

This tends to happen once a day, but it seems that heavy access (e.g.,
doing a find in the root of the fs) tends to favor its occurrence.

I'm sorry if this has been already reported but searching for
'd?????????' seems futile in google.

$ lsb_release -rd
Description:	Ubuntu 12.10
Release:	12.10
$ apt-cache policy fuse
fuse:
  Installed: 2.9.0-1ubuntu2

** Affects: fuse (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1152186

Title:
  possible fuse crash and inaccessible mounted filesystem

Status in “fuse” package in Ubuntu:
  New

Bug description:
  I use heavily encfs and sshfs filesystems. Since 12.10 I observe
  regularly that mounted filesystems go awry but remain mounted, and
  files within them are not accessible. The obvious symptom is listing
  the folder in which they're mounted. In the following example an encfs
  is mounted in a folder named 'dropbox':

  $ ls -lF
  ls: cannot access dropbox: Transport endpoint is not connected
  total 16K
  d????????? ? ?    ?       ?            ? dropbox/
  -rwxr-xr-x 1 jano jano  937 mar  6 10:39 fixlinks*

  There is the dropbox folder and the the regular file fixlinks, for
  comparison, which is in the same folder.

  Sometimes the folder can be unmounted simply with sudo umount
  <folder>, others it is necessary to use -l (lazy unmount).

  I suspected encfs could be responsible, until I saw this with a sshfs
  filesystem. Still, I've been able to locate any log or crash message
  to confirm that fuse is the culprit. Any indications on how to debug
  this further are welcome.

  This tends to happen once a day, but it seems that heavy access (e.g.,
  doing a find in the root of the fs) tends to favor its occurrence.

  I'm sorry if this has been already reported but searching for
  'd?????????' seems futile in google.

  $ lsb_release -rd
  Description:	Ubuntu 12.10
  Release:	12.10
  $ apt-cache policy fuse
  fuse:
    Installed: 2.9.0-1ubuntu2

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