[SOLVED] udev crashes when adding devices

Telumehtar · 02-06-2018, 02:37 PM

I have a ThinkPad W520 which crashes, when I add devices via udev.

It is possibly a hardware issue, since it started suddenly a couple of years ago, without any apparent reason. I was running Slackware 14.0 at the time, but switching to 13.37 fixed it, and I have been running 13.37 since.

Now, I have just installed a fresh copy of 14.2, and determined that udev is the cause of the problem. By only adding specific devices via udev, I have managed to get network and graphics working, but I am still working on audio and a lot of minor devices.

Currently, it is just a trial and error process: I add some devices and check, whether the system crashes. For instance, the following will provoke a crash only after the last line:

Code:

root@bor:~# lspci
01:00.0 VGA compatible controller: NVIDIA Corporation GF108GLM [Quadro 1000M] (rev a1)
01:00.1 Audio device: NVIDIA Corporation GF108 High Definition Audio Controller (rev a1)
03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] (rev 34)
root@bor:~# udevadm trigger --action=add --property-match='DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0*'
root@bor:~# udevadm trigger --action=add --property-match='DEVPATH=/devices/pci0000:00/0000:00:1c.1/0000:03:00.0*'
root@bor:~# udevadm trigger --action=add --property-match='DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.1*'

However, since it all worked in 13.37, it is not JUST a hardware issue. I gather that disabling udev altogether is rather difficult. Is there an alternative way to get the audio working, or does anybody have an idea what is going on?

abga · 02-06-2018, 06:50 PM

Have a look on this (for inspiration):
https://askubuntu.com/questions/6411...ound-card-hdmi

Note that there are many reports about some Nvidia drivers versions crashing the system and you should try to play with a different version than the one you're using now - I'm not sure the one you used on 13.37 will still work in 14.2 an its new kernel.

keefaz · 02-06-2018, 07:07 PM

Maybe set udev_log="debug" in /etc/udev/udev.conf
Then check /var/log/debug, possibly /var/log/syslog too

Telumehtar · 02-07-2018, 03:04 AM

Thanks for your suggestions.

I have tried starting udev after starting X (twm), and it seems to work. I have tried twice with working sound and no crashes, and it works in X even if I include all devices.

I have absolutely no idea why this should make any difference. The audio driver is probably above suspicion, but I will try to look at the udev log to see if I can find the source of the problem.

For now I will just mark this as solved, but if anybody has an idea as to what is going on, I would like to know.