On 26/05/16 23:39, James wrote:
Daniel Frey gmail.com> writes:
It appears to be udev. Somewhere along in its stupid detection it
decides to process USB devices before sata ports, thusly randomly
renaming the boot drive to something else in the process.
It took me forever to figure this out, I eventually had a lightbulb
moment and used my phone to record video of it booting, then slowing it
down, as when the kernel panics you can't scroll back up to see WTF
happened.
Kernel crash dumps might help [1]
This is an older machine, but I'm not convinced it's the motherboard
doing this. I've checked the boot order in the BIOS. I've also tried
setting and unsetting "BIOS order determines boot disk" in the kernel
config and it made no difference.
You might want to 'emerge -1 sys-apps/hwids'
What eventually fixed it was building USB as modules. (Another kludge!)
There are numerous 'usb sniffers' that capture data. Some clue
might be found using a usb sniffer.
I have no custom udev rules, the only rules I could find were in
/lib/udev/rules.d:
I use sys-fs/eudev. ymmv.
Does anyone have any explanation for this daft behaviour or know where I
should look?
I have multiple machines and it's only this one that has this problem,
which happened after a world update long ago.
If you have a similar setup on similar hardware, then 'diff' the (dmesg)
boot log files for any differences and analyze.
hth,
James
[1] https://wiki.gentoo.org/wiki/Kernel_Crash_Dumps
I had similar problems. Fixed them permanently by using disk labels on
all partitions on all computers.
