bug#51110: Native-comp leaks fds open on /dev/ptmx

[Andrea Corallo <akrl@sdf.org>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Stephen Gildea <stepheng+emacs@gildea.com>
>> cc: Andrea Corallo <akrl@sdf.org>, 51110@debbugs.gnu.org
>> Date: Sat, 09 Oct 2021 10:01:43 -0700
>> 
>> Apparently what's happening is that Emacs forks off a child Emacs to do
>> the compile and allocates a pty to the child.  These ptys are not
>> closed until the compile completes.  It seems Emacs needs to better
>> manage the number of simultaneous open ptys.  Or at least be able to
>> wait and retry if an open fails.
>
> Emacs limits the number of these background processes, see
> native-comp-async-jobs-number.  (The value zero means use half of the
> number of execution units available in the system's processor.)  So we
> generally shouldn't have more than that number of open pipes at any
> given time.  For the obvious reasons they cannot be closed until the
> sub-process exits.

Is there any action we need/can take on this bug?

Thanks

  Andrea