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 ...

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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

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