If it's any bit of helpful information, I occasionally have this issue
(on 18.04) and it is fixed by a proper shutdown and boot. It seems to
happen for me when one of the servers that I sshfs to crashes/becomes
unavailable (or something else server side) and the issue persists past
the time in which the server is back and functional.

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https://bugs.launchpad.net/bugs/1702368

Title:
  Mounted sshfs filesystems sometimes prevent suspend

Status in gnome-settings-daemon package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Triaged
Status in sshfs-fuse package in Ubuntu:
  Confirmed

Bug description:
  Using Ubuntu artful with linux-image-4.10.0-26-generic 4.10.0-26.30
  and sshfs 2.8-1. I use "sshfs -o reconnect" and often run gvim against
  a file on an sshfs filesystem.

  Sometimes when I suspend I get:

  Jul  4 20:59:08 xps kernel: [46684.608740] PM: Syncing filesystems ... done.
  Jul  4 20:59:08 xps kernel: [46684.613278] PM: Preparing system for sleep 
(mem)
  Jul  4 20:59:08 xps kernel: [46684.613788] Freezing user space processes ... 
  Jul  4 20:59:08 xps kernel: [46704.620140] Freezing of tasks failed after 
20.006 seconds (1 tasks refusing to freeze, wq_busy=0):
  Jul  4 20:59:08 xps kernel: [46704.620534] gvim            D    0 11155   
1336 0x00000004
  Jul  4 20:59:08 xps kernel: [46704.620541] Call Trace:
  Jul  4 20:59:08 xps kernel: [46704.620556]  __schedule+0x233/0x6f0
  ...
  Jul  4 20:59:08 xps kernel: [46704.620679]  
entry_SYSCALL_64_fastpath+0x1e/0xad
  ...
  Jul  4 20:59:08 xps kernel: [46704.620711] Restarting tasks ... done.

  ...and the system fails to suspend.

  AFAICT, this is https://bugzilla.redhat.com/show_bug.cgi?id=656992 and
  https://lists.debian.org/debian-kernel/2011/10/msg00412.html has an
  extensive explanation. The corresponding Debian bug was closed long
  ago due to inactivity. It isn't exactly bug 388419 though since that
  is about behaviour after resume, rather than failure to suspend.

  This affects sshfs-fuse, but it sounds like a full fix would be in the
  kernel. I wonder if it's possible to work around in userspace
  packaging in sshfs-fuse, though, by arranging some action in userspace
  before suspend?

  It seems unlikely that this will be addressed any time soon, but it'd be nice 
to keep a bug open in Launchpad so that users can have a single rallying point.
  --- 
  ApportVersion: 2.20.5-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  robie      1519 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 17.10
  HibernationDevice: RESUME=UUID=ae23a431-2f44-4c12-992a-a0da8186bfcc
  InstallationDate: Installed on 2017-05-11 (54 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170507)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 0bda:568b Realtek Semiconductor Corp. 
   Bus 001 Device 002: ID 0cf3:e300 Atheros Communications, Inc. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 13 9360
  Package: sshfs-fuse
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.10.0-26-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.10.0-26.30-generic 4.10.17
  RelatedPackageVersions:
   linux-restricted-modules-4.10.0-26-generic N/A
   linux-backports-modules-4.10.0-26-generic  N/A
   linux-firmware                             1.167
  Tags:  artful
  Uname: Linux 4.10.0-26-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip libvirt lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 01/18/2017
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.3.2
  dmi.board.name: 00GCYR
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.3.2:bd01/18/2017:svnDellInc.:pnXPS139360:pvr:rvnDellInc.:rn00GCYR:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9360
  dmi.sys.vendor: Dell Inc.

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