5810 installation report
Alan's Home for Wayward Notes File.
alan at shodha.dec.com
Tue Jan 2 06:20:26 AEST 1990
In article <9179 at cbmvax.commodore.com>, grr at cbmvax.commodore.com (George Robbins) writes:
>
> [ Lots of stuff deleted. ]
>
> Second, I've got a couple of DMB32's, but when I activated logins on a
> couple of lines (with no cables attached yet) a later caught them running
> up a bunch of CPU time. This isn't funny, but I haven't had a chance to
> try various thing and see what the system thinks it's doing.
>
> Anybody had problems with DMB32's on VAX Ultrix?
I've seen this sort of problem of nearly every version of
ULTRIX and combination of CPU and terminal controller since
the beginning of time. It goes something like this:
1. The getty with the line open, sees noise and thinks
it's someone trying to login, so it either prompts
for the user name or forks a login to let it do the
work.
2. Login searchs the password file for the noise and prompts
for a password. Even if it doesn't find a username it
asks for a password so people breaking in don't know if
the account is valid. Since the username was noise the
login is invalid, so login exits.
3. Some time later init notices that nothing is running on
on the tty line, so it starts another getty. Goto #1.
Init is (or should be) smart enough to see if this happens
with great frequency and scribbles a message to syslog,
and waits a short time before restarting the getty.
4. Symtoms: Lots of system calls, lots of time spent in
kernel mode and lots of forks.
Solution: All activeated tty lines should be connected
to terminals and the terminals should be turned on.
>
> --
> George Robbins - now working for, uucp: {uunet|pyramid|rutgers}!cbmvax!grr
> but no way officially representing arpa: cbmvax!grr at uunet.uu.net
> Commodore, Engineering Department fone: 215-431-9255 (only by moonlite)
--
Alan Rollow alan at nabeth.enet.dec.com
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