[Bug 1823721] Re: systemctl fstrim.timer freeze computer with a SSD on a dual boot system Windows 10/Ubuntu 18.04

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: systemd (Ubuntu)
       Status: New => Confirmed

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Title:
  systemctl fstrim.timer freeze computer with a SSD  on a dual boot
  system Windows 10/Ubuntu 18.04

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  The default systemctl fstrim.timer on Ubuntu 18.04 entirely freeze the
  computer once a week (usually on Monday midnight) in the case of a
  dual boot system installed on a SSD (Windows/Ubuntu) due to high IO
  overhead. I also had several freeze at boot due to the same problem.

  When the freeze occur I can open a tty terminal and type the command
  iotop to see the process which use that amount of IO. It was mount
  .ntfs-3g which point to my mount point to my Windows 10 install on my
  SSD.

  When the freeze occur the system is not responsive for about 10-15
  minutes.

  I solved my issue by disabling the fstrim.timer entirely with this
  command:

  sudo systemctl disable fstrim.timer

  I can reproduce the problem on my installation by launching the
  fstrim-timer:

  sudo systemctl start fstrim.timer

  Imediately after launching fstrim.timer, iotop display this line at
  top, with my Windows 10 mount point:

    TID  PRIO  USER     DISK READ  DISK WRITE  SWAPIN     IO>    COMMAND
    893 be/4 root        0.00 B/s    0.00 B/s  0.00 % 99.10 % mount.ntfs-3g /dev/sda1 /media/systeme_windows -o rw,noatime,noexec,nosuid,nodev,gid=100,uid=1000,nls=utf8,windows_names,umask=002,user

  And a few minutes later:

    TID  PRIO  USER     DISK READ  DISK WRITE  SWAPIN     IO>    COMMAND
  20077 be/4 root        0.00 B/s    0.00 B/s  0.00 % 99.45 % fstrim -av

  ----
  Systemd 237-3ubuntu10.19
  Ubuntu 18.04.2
  Linux 4.18.0-17-generic

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