[Bug 1032334] [NEW] FUSE sometimes freezes, making it impossible to unmount the filesystem or even kill the processes accessing it

[Dima Ryazanov]

Public bug reported:

I had a directory mounted using sshfs. When I disconnected from the
network, sshfs froze, making it impossible to unmount the directory.
"fusermount -u" complained that the filesystem was busy. "fusermount -z
-u" appeared to unmount it - but all programs that were accessing it
earlier were still frozen. Killing the "sshfs" process didn't help. I
can't even kill any of the programs that froze - they're stuck in
uninterruptible sleep.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: fuse 2.8.6-2ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-29.46+kamal5~DellXPS-generic 3.2.24
Uname: Linux 3.2.0-29-generic x86_64
ApportVersion: 2.0.1-0ubuntu11
Architecture: amd64
Date: Thu Aug  2 11:54:48 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: fuse
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/1032334

Title:
  FUSE sometimes freezes, making it impossible to unmount the filesystem
  or even kill the processes accessing it

Status in “fuse” package in Ubuntu:
  New

Bug description:
  I had a directory mounted using sshfs. When I disconnected from the
  network, sshfs froze, making it impossible to unmount the directory.
  "fusermount -u" complained that the filesystem was busy. "fusermount
  -z -u" appeared to unmount it - but all programs that were accessing
  it earlier were still frozen. Killing the "sshfs" process didn't help.
  I can't even kill any of the programs that froze - they're stuck in
  uninterruptible sleep.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: fuse 2.8.6-2ubuntu2
  ProcVersionSignature: Ubuntu 3.2.0-29.46+kamal5~DellXPS-generic 3.2.24
  Uname: Linux 3.2.0-29-generic x86_64
  ApportVersion: 2.0.1-0ubuntu11
  Architecture: amd64
  Date: Thu Aug  2 11:54:48 2012
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: fuse
  UpgradeStatus: No upgrade log present (probably fresh install)

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