[Bug 1753655] Re: fwupd doesn't release hidraw devices

[Mario Limonciello]

This bug has been fixed in the fwupd 1.1.1 release that's now in cosmic.

** Changed in: fwupd (Ubuntu)
       Status: Triaged => Fix Released

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Title:
  fwupd doesn't release hidraw devices

Status in fwupd package in Ubuntu:
  Fix Released

Bug description:
  fwupd doesn't release hidraw devices for unplugged peripherals,
  causing the kernel to keep allocating new hidraw devices until it hits
  HIDRAW_MAX_DEVICES.

  Steps to reproduce:
  1. Ensure that fwupd.service is running
  2. Plug in a Logitech Unifying Receiver (or any other thing that creates a hidraw device that fwupd recognizes)
  3. Unplug it.
  4. Repeat 2 and 3, and note that the allocated hidraw device number keeps increasing.
  5. HIDRAW_MAX_DEVICES=64, so after /dev/hidraw64 is hit, no new hidraw devices can be allocated until fwupd is restarted
  6. Check the list of hidraw devices being held by fwupd:

  % sudo lsof -p $(pidof fwupd) -n | grep hidraw
  fwupd   15027 root   16u      CHR              246,6      0t0 83682527 /dev/hidraw6 (deleted)
  fwupd   15027 root   30u      CHR              246,7      0t0 83769950 /dev/hidraw7 (deleted)
  fwupd   15027 root   31u      CHR             246,11      0t0 83771266 /dev/hidraw11 (deleted)
  fwupd   15027 root   33u      CHR              246,8      0t0 83778056 /dev/hidraw8 (deleted)
  fwupd   15027 root   34u      CHR             246,13      0t0 83779740 /dev/hidraw13 (deleted)
  fwupd   15027 root   39u      CHR              246,9      0t0 83912152 /dev/hidraw9 (deleted)
  fwupd   15027 root   41u      CHR             246,10      0t0 83916478 /dev/hidraw10 (deleted)
  fwupd   15027 root   43u      CHR             246,12      0t0 83918049 /dev/hidraw12 (deleted)
  fwupd   15027 root   45u      CHR             246,14      0t0 83923588 /dev/hidraw14 (deleted)
  fwupd   15027 root   47u      CHR             246,15      0t0 83927517 /dev/hidraw15 (deleted)
  fwupd   15027 root   48u      CHR             246,19      0t0 83928356 /dev/hidraw19 (deleted)
  fwupd   15027 root   50u      CHR             246,16      0t0 83935331 /dev/hidraw16 (deleted)
  fwupd   15027 root   57u      CHR             246,17      0t0 83953052 /dev/hidraw17 (deleted)
  fwupd   15027 root   59u      CHR             246,18      0t0 83953650 /dev/hidraw18 (deleted)
  fwupd   15027 root   61u      CHR             246,24      0t0 83955207 /dev/hidraw24

  7. Restart fwupd.service.
  8. Note that the newly created /dev/hidraw device is now back to a small number.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: fwupd 0.9.7-2ubuntu1
  Uname: Linux 4.14.12-hyper1+ x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Tue Mar  6 13:42:00 2018
  SourcePackage: fwupd
  UpgradeStatus: Upgraded to artful on 2017-11-04 (121 days ago)

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