System V is Crashing
Alan Fargusson
alan at drivax.UUCP
Wed Aug 28 03:31:59 AEST 1985
> By using crash(1m) I discovered zillions of entries in the callout array
> which were to restart the printer's tty driver. I can't remember the
> exact circumstances, but I know that the callouts looked suspect and the
> use of fill characters (add OFILL to tio.c_oflag above) for delays rather
> than callouts cured the problem immediately.
I had forgotten about that one. There is a bug in the DZ driver (dz.c)
in dzproc. The case T_OUTPUT there is a line like:
if (tp->t_state & (BUSY|TTSTOP))
It should be:
if (tp->t_state & (TIMEOUT|BUSY|TTSTOP))
I told someone at AT&T about it over a year ago, but I don't think they
wanted to know.
--
Alan Fargusson.
{ ihnp4, amdahl, mot }!drivax!alan
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