Public bug reported:
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)
** Affects: fwupd (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug artful
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https://bugs.launchpad.net/bugs/1753655
Title:
fwupd doesn't release hidraw devices
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