Comment # 31 on bug 1200461 from Mike DeMicco

(In reply to Thomas Blume from comment #29)
> (In reply to Mike DeMicco from comment #28)
> > FYI, there was a change to dracut-functions.sh that invoked "udevadm info
> > -a." Older versions of this shell script do not do this (e.g., the 15.3
> > version of Leap, vs. latter versions). This is the change that caused the
> > problem on my system.
> 
> Ok, still, 'updevadm info -a' should not hang your computer.
> Unfortunately, the udev debug logs didn't make it into the dmesg output.
> But I've found a resource conflict with your i/o controller:
> 
> -->
> [   13.209692] ACPI Warning: SystemIO range
> 0x0000000000000428-0x000000000000042F conflicts with OpRegion
> 0x000000000000042C-0x000000000000042D (\GP2C) (20211217/utaddress-204)
> [   13.209701] ACPI: OSL: Resource conflict; ACPI support missing from
> driver?
> [   13.211431] lpc_ich: Resource conflict(s) found affecting gpio_ich
> --<
> 
> Such conflicting resources could probably cause a system hang when they are
> accessed by udevadm via sysfs.

When I Google this error, I get a lot of hits. Mostly say the error message is
informative and harmless and bugs were closed saying the same.