69-mixxx-usb-uaccess.rules causes long boot time Ubuntu 24.04

[mrbrico]

Bug Description

After upgrading to Ubuntu 24.04 boot times increased to around 4 minutes, I tracked this down to the above, commenting out KERNEL=="hiddev*", NAME="usb/%k", GROUP="uaccess" fixed the extremely long boot times.

By default this is enabled in the udev rule /usr/lib/udev/rules.d/69-mixxx-usb-uaccess.rules

Only some distribuions require the below

KERNEL=="hiddev*", NAME="usb/%k", GROUP="uaccess"

Maybe default this should be commented out and enabled if needed...?

Version

2.4.1

OS

Ubuntu 24.04

[acolombier]

Hi @mrbrico , I haven't yet moved to 24.04 (waiting for the July SP).
Would you be able to provide some system logs to try and narrow down the problem?

[mrbrico]

Hi Antoine, I certainly do not mind running any tests and grabbing the logs for you... I can un comment the udev rule... would you just like the system log? Thanks for all your hard work on mixxx

[mrbrico]

log_messages_udev_disabled.log
log_messages_udev_enabled.log

with the 1 min delay between the following when the rule is enabled
19:24:31 kernel: iwlwifi 0000:00:14.3: WRT: Invalid buffer destination
19:23:35 kernel: Console: switching to colour frame buffer device 240x75

[acolombier]

Thanks for the logs and the kind words.

I'm not sure there is enough info to narrow down this bug. Could you try the following:

• Enable the udev rule
• Reload udev (sudo udevadm control --reload-rules && sudo udevadm trigger)
• Reboot (make sure the problem is still there)
• Run sudo journalctl --boot=-1 and share that. This will include both dmesg and systemd logs (which should be used to run udev daemon)

In the meantime, I have just checked on my end (PopOS 22.04) with sudo systemctl status udev.service and spotted that in the logs:

hiddev4: /usr/lib/udev/rules.d/69-mixxx-usb-uaccess.rules:61 Only network interfaces can be renamed, ignoring NAME="usb/%k".

I will look if I can fix that!
Edit: already tracked as #12526

[mrbrico]

Journalctl boot log with the rule enabled...
journalctl_boot.log

This error is what lead me to comment out the line in the rule...
systemd-udevd[506]: /usr/lib/udev/rules.d/69-mixxx-usb-uaccess.rules:61 Unknown group 'uaccess', ignoring.

[acolombier]

Yeah, this rule seems to be quite out of date, but that warning should block the system.

I can see you've started the reboot at 20:04:42 and the system rebooted at 20:04:46, does that mean you were unable to reproduce the issue this time?
Also, do you use a HID controller with Mixxx?

[mrbrico]

The delay is still there when the rule is enabled, its about 1 min delay now though... if I disable boot quiet in grub I can see systemd just stop for about 1 min before continuing. I could not find anything obvious in the logs and just went through errors I saw that may have affected boot time, plymouth / app amour /network manager until I tried the udev error above..

The system log shows the delay but not why, like it just stops for 1 min
19:24:31 kernel: iwlwifi 0000:00:14.3: WRT: Invalid buffer destination
19:23:35 kernel: Console: switching to colour frame buffer device 240x75

I use A&H k2 controllers or NI x1 controllers, also testing with serato dvs.. I never had the pioneer xdj 1000 mk2's working

[acolombier]

Thanks for the details.
I will try to reproduce this in a VM soon and report my findings.