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

[Dima Ryazanov]

It also prevents the system from suspending:

Aug  7 20:31:29 dima-xps kernel: [28554.059134] Freezing of tasks failed after 20.00 seconds (1 tasks refusing to freeze, wq_busy=0):
Aug  7 20:31:29 dima-xps kernel: [28554.059203] gedit           D 0000000000000001     0  6819      1 0x00800004
Aug  7 20:31:29 dima-xps kernel: [28554.059207]  ffff8800546d9a18 0000000000000082 ffffffff81079fbb ffff88006725dc00
Aug  7 20:31:29 dima-xps kernel: [28554.059211]  ffff8800546d9fd8 ffff8800546d9fd8 ffff8800546d9fd8 0000000000013780
Aug  7 20:31:29 dima-xps kernel: [28554.059214]  ffff8800b30f0000 ffff88006725dc00 ffff8800546d9a28 ffff8801150d3b60
Aug  7 20:31:29 dima-xps kernel: [28554.059218] Call Trace:
Aug  7 20:31:29 dima-xps kernel: [28554.059225]  [<ffffffff81079fbb>] ? recalc_sigpending+0x1b/0x50
Aug  7 20:31:29 dima-xps kernel: [28554.059230]  [<ffffffff816579cf>] schedule+0x3f/0x60
Aug  7 20:31:29 dima-xps kernel: [28554.059235]  [<ffffffff81278c15>] request_wait_answer+0x85/0x230
Aug  7 20:31:29 dima-xps kernel: [28554.059238]  [<ffffffff8108aa50>] ? add_wait_queue+0x60/0x60
Aug  7 20:31:29 dima-xps kernel: [28554.059241]  [<ffffffff81278e35>] fuse_request_send+0x75/0xb0
Aug  7 20:31:29 dima-xps kernel: [28554.059244]  [<ffffffff8127d56d>] fuse_dentry_revalidate+0x14d/0x280
Aug  7 20:31:29 dima-xps kernel: [28554.059248]  [<ffffffff8118485b>] do_lookup+0x18b/0x310
Aug  7 20:31:29 dima-xps kernel: [28554.059251]  [<ffffffff8129c8ac>] ? security_inode_permission+0x1c/0x30
Aug  7 20:31:29 dima-xps kernel: [28554.059254]  [<ffffffff811851d8>] link_path_walk+0x138/0x870
Aug  7 20:31:29 dima-xps kernel: [28554.059256]  [<ffffffff8118641d>] ? path_init+0x2ed/0x3c0
Aug  7 20:31:29 dima-xps kernel: [28554.059259]  [<ffffffff81186548>] path_lookupat+0x58/0x750
Aug  7 20:31:29 dima-xps kernel: [28554.059263]  [<ffffffff81318db7>] ? __strncpy_from_user+0x27/0x60
Aug  7 20:31:29 dima-xps kernel: [28554.059266]  [<ffffffff81186c71>] do_path_lookup+0x31/0xc0
Aug  7 20:31:29 dima-xps kernel: [28554.059268]  [<ffffffff81187779>] user_path_at_empty+0x59/0xa0
Aug  7 20:31:29 dima-xps kernel: [28554.059273]  [<ffffffff811b6152>] ? fsnotify+0x1c2/0x2a0
Aug  7 20:31:29 dima-xps kernel: [28554.059276]  [<ffffffff81659bc5>] ? _raw_spin_lock_irq+0x15/0x20
Aug  7 20:31:29 dima-xps kernel: [28554.059278]  [<ffffffff811877d1>] user_path_at+0x11/0x20
Aug  7 20:31:29 dima-xps kernel: [28554.059282]  [<ffffffff8117c80a>] vfs_fstatat+0x3a/0x70
Aug  7 20:31:29 dima-xps kernel: [28554.059284]  [<ffffffff8117c85e>] vfs_lstat+0x1e/0x20
Aug  7 20:31:29 dima-xps kernel: [28554.059287]  [<ffffffff8117c9fa>] sys_newlstat+0x1a/0x40
Aug  7 20:31:29 dima-xps kernel: [28554.059289]  [<ffffffff81177ba0>] ? vfs_write+0x110/0x180
Aug  7 20:31:29 dima-xps kernel: [28554.059292]  [<ffffffff81177e87>] ? sys_write+0x67/0x90
Aug  7 20:31:29 dima-xps kernel: [28554.059295]  [<ffffffff81661ec2>] system_call_fastpath+0x16/0x1b
Aug  7 20:31:29 dima-xps kernel: [28554.059319] 
Aug  7 20:31:29 dima-xps kernel: [28554.059320] Restarting tasks ...

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to fuse in Ubuntu.
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)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/fuse/+bug/1032334/+subscriptions