Subject: port-mac68k/7870: Keystrokes duplicated on console in system under heavy load
To: None <>
From: None <>
List: netbsd-bugs
Date: 06/27/1999 17:06:12
>Number:         7870
>Category:       port-mac68k
>Synopsis:       Keystrokes duplicated on console in system under heavy load
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    port-mac68k-maintainer (NetBSD/mac68k Portmaster)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jun 27 17:05:00 1999
>Originator:     Bob Nestor
>Release:        Release 1.4 mac68k
NetBSD pluto 1.4 NetBSD 1.4 (GENERICSBC) #0: Sat May  8 20:55:03 PDT 1999     root2@c610:/usr/src/sys/arch/mac68k/compile/GENERICSBC mac68k

console keyboard input is sometimes duplicated when the system is under heavy Serial load?  Typing "abc" will sometimes show up as "aabbc".
The problem may also occur with other non-serial interrupt load on the system.
Allen Briggs reports being able to duplicate the problem as follows:
"Q700 under heavy disk and reasonable ethernet
load (20MB machine with two disks running about 12 copies of
'ls -lasR / > /dev/null 2>&1 &' and a 'ping -n -s 32760 xx.xx.xx.xx')."
He is running with the new AU/X interrupt scheme, my system is running with
the interrupt scheme in the 1.4 release kernel.

Provide a heavy interrupt load on the system with Serial Port activity,
ethernet, disk, etc. Editing a file on the console will usually show the
problem, although it doesn't occur with every keystroke.  I'm seeing it
happen in about one out of 50 keystrokes.