Keyboard hangs

[Sakari Jalovaara]

(Sun 3/50, SunOS 4.0.3)

Sometimes when X (MIT "example" X11R3 and X11R4) exits, the keyboard first
sends random characters and then freezes completely.  This has happened
several (10..20) times on our dozen Suns.

I have tried the following:

	kbd_mode -a			no effect
	stty sane >/dev/console		hangs
	echo foo >/dev/console		nothing appears on the console
	kill -9 [getty PID]		new getty appears, kbd still hung
	fastboot			fixes
	rsh [machine] xinit		X works; keyboard still dead when
					X exits
	rsh [machine] suntool		suntools works; keyboard still
					dead when suntools exits
	L1-A C				abort works (goes to the ROM
					monitor); keyboard still dead
					after C(ontinue)
	disconnect and reconnect
		the keyboard		no effect
	kill -9 [getty pid]; trace -p [new getty PID]
					This cures the keyboard!  Trace
					sometimes does magical things...

This might (read: "gut feeling") be streams-related; "netstat -m" reports
lots (hundreds or thousands) of allocation failures after keyboard hangs.

Has anyone else seen this?  Is there a fix?
									++sja