why multiple xdm ? and why do they hang ?

From: Lucio Chiappetti <lucio_at_ifctr.mi.cnr.it>
Date: Fri, 13 Dec 1996 17:50:27 +0100 (MET)

It happens occasionally mainly on one of our three Alphas that after the user
logs out, the login window hangs (characters entered at the keyboard do not
appear and one cannot log in on the console).

This happens often on our 200/100, and sometimes on one of the 255/233 and
never on my 255/233. I believe the thing is related to a particular user
(student) who uses the public 200/100 and sometimes the 255/233 of his
advisor, more than to the machine. The thing seem to happen after HE has
logged out.

He is not particularly computer-skilled so whatever he does is not done
voluntarily.

Today the thing happened again and before rebooting the machine (the only way
I know of clearing the problem) I noticed that ...

  ... there are two instances of xdm running on that particular machine
  (one with a very low pid, and the other one with a higher pid and Xdec
  etc. as children)

I tried killing the higher pid xdm, and then the lower pid one, but in both
cases that did not unlock the keyboard (killing the first one also killed Xdec
but did not restart it, as it usually happens after a regular logout in our
configuration).

1) is it normal to have two xdm at one time ?
2) can this cause the keyboard hang ?
3) or what else can be the cause ?
4) how can this be cured / prevented ?

BTW, all machines have DU 3.2

TIA

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Received on Fri Dec 13 1996 - 18:05:42 NZDT

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