Hi,

I upgraded three machines from Devuan ascii to Devuan beowulf. Now one
of these machines has non-deterministic problems during startup that
look like being related to eudev. As that machine was originally
derived by cloning the hard-disk of another machine that works fine, I
suspect this issue is not a general configuration problem that I caused.

That machine previously worked flawlessly with Devuan ASCII.

The symptoms are as follows:

This happens around half the times I reboot the machine. In the other
half of the cases everything works as usual. However, if it fails, this
happens:

- during startup, the LVM init.d-script hangs for a very long time
repeatedly outputting errors of the form

WARNING: Device /dev/xxx not initialized in udev database even after
waiting 10000000 microseconds.

- none of the alsa sound driver modules is loaded during boot, so I
end up with a Desktop that does not support audio

- the amdgpu module is not loaded, so not 3-D acceleration

Comparing dmesg output between successful startup and failed startup,
the following markedly differs:

In both cases, the line 'udevd[558]: starting eudev-3.2.7' appears twice
in the dmesg output. Differences happen after the second time it is
printed. In the "failed boot" case it merely outputs

xxxx udevd[558]: starting eudev-3.2.7
xxxx lp: driver loaded but no devices found
xxxx ppdev: user-space parallel port driver

In the succesful case it outputs a whole lot of ACPI-related stuff and
loads the sound-related modules:

xxxx udevd[560]: starting eudev-3.2.7
xxxx acpi_cpufreq: overriding BIOS provided _PSD data
xxxx input: Power Button as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input6
xxxx ACPI: Power Button [PWRB]
xxxx input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input7
xxxx ACPI: Power Button [PWRF]
xxxx ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
xxxx acpi device:00: registered as cooling_device4
xxxx input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input8
xxxx sp5100_tco: SP5100/SB800 TCO WatchDog Timer Driver
xxxx sp5100-tco sp5100-tco: Using 0xfeb00000 for watchdog MMIO address
xxxx sp5100-tco sp5100-tco: initialized. heartbeat=60 sec (nowayout=0)
[..]
xxxx input: PC Speaker as /devices/platform/pcspkr/input/input9
xxxx udevd[626]: failed to execute '/lib/udev/mtp-probe' 'mtp-probe
/sys/devices/pci0000:00/0000:00:10.0/usb2/2-3 2 3': No such file or
directory
[..]
xxxx ACPI Error: Needed [Buffer/String/Package], found [Integer]
000000003089d4ef (20180810/exresop-560)
[..]
xxxx snd_hda_intel 0000:00:01.1: Force to non-snoop mode
xxxx kvm: disabled by bios
xxxx MCE: In-kernel MCE decoding enabled.
xxxx input: HDA ATI HDMI HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:01.1/sound/card0/input11
[..]

Any ideas what is happening here and how to workaround it? Or any ideas
how to further diagnose this problem?

Thanks for any help,

cheers,

David