[PLUG] What could this mean?

[John Jason Jordan]

On booting (Grub line has "quiet no splash") I suddenly got a couple
screenfuls of the following:

udevd[2216] add-to-rules: unknown 'attrs{idProduct}'

The same line repeated for about a screenful worth on shutdown, but
after restarting, shutting down, and restarting a few times, it now
happens only on bootup. In spite of what appears to be an error
message, the computer seems to operate fine.

Whatever it means, it was caused by something in the following: Edgy
amd64 announced that I had half a dozen upgrades. I was applying the
upgrades with Synaptic when the computer locked up -- dead keyboard and
mouse, no disk activity. I had to hit the power button.

When Grub came back up I decided to run memtest. I have never done this
before, but I recently ran into a webpage suggesting that memory might
be a cause of lockups -- and I have one original 256 MB stick and one 1
GB replacement stick. Maybe there is a memory mismatch or something. So
I ran memtest one pass, a little over an hour. No errors, so I went
ahead and booted. That is when the above message suddenly appeared.

Google tells me that udevd is some kind of utility, but I don't
understand what it does. And the rest of it is in Greek. But if I
understood it I bet I would know what is wrong and have a fair chance
of fixing it.