Re: kern/54033: Interrupted writes can cause pty to stall

[Christos Zoulas <christos%zoulas.com@localhost>]

> On Mar 2, 2019, at 9:10 AM, matthew green <mrg%eterna.com.au@localhost> wrote:
> 
> The following reply was made to PR kern/54033; it has been noted by GNATS.
> 
> From: matthew green <mrg%eterna.com.au@localhost>
> To: gnats-bugs%NetBSD.org@localhost
> Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
>    netbsd-bugs%netbsd.org@localhost
> Subject: re: kern/54033: Interrupted writes can cause pty to stall
> Date: Sun, 03 Mar 2019 01:09:31 +1100
> 
> this may or may not be related.
> 
> some relatively small portion of the time when i run
> "cvs <something> | less" and the cvs has a lot of
> output (eg, annotate or log), and i do not let it
> complete running to completion and less having all the
> output buffered internally, by ^Z'ing back to the shell
> and doing other stuff.
> 
> sometimes that ^Z hangs and i can't use that pty again
> until i kill -9 the pipe-writing process (eg, cvs log)
> at which point, i get my shell back and less is now
> suspended with some partial input.
> 
> this was worse a few years ago and now happens only
> sometimes, vs often.  at the time, i thought the fix
> that christos had made solved my problem, but now i
> suspect it only makes it less likely to hit.
> 
> 
Can you please remind me what was the fix that I made?
Perhaps it is incomplete, or incorrect?

christos