GNU bug report logs - #79228
30.1.90; native--compile-async sentinel can error if threads are running

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Andrea Corallo <acorallo <at> gnu.org>
Cc: sbaugh <at> janestreet.com, johnw <at> gnu.org, 79228 <at> debbugs.gnu.org
Subject: bug#79228: 30.1.90; native--compile-async sentinel can error if threads are running
Date: Sat, 30 Aug 2025 10:31:30 +0300

Ping!  Andrea, could you please look into this?

> Cc: johnw <at> gnu.org, 79228 <at> debbugs.gnu.org
> Date: Wed, 13 Aug 2025 14:41:46 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> > Cc: John Wiegley <johnw <at> gnu.org>
> > Date: Tue, 12 Aug 2025 17:56:29 -0400
> > From:  Spencer Baugh via "Bug reports for GNU Emacs,
> >  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> > 
> > 
> > Other threads can run pending_funcalls if they call
> > accept-process-output.  This should probably not be allowed.
> > 
> > A specific bug is that the C core calls native--compile-async using
> > pending_funcalls.  If that runs on another thread, then the processes
> > created in native--compile-async are locked to that other thread.  Then
> > the sentinels for those processes error when they call
> > accept-process-output on the processes while on yet another thrad.  Or
> > something like that; the sentinels were definitely erroring with the
> > "Attempt to accept output from process %s locked to thread %s" error.
> > 
> > This can be reproduced somewhat reliably by causing the C code to start
> > async native compilation while there are other threads running.  Sorry
> > for not making a full reproduction, but I think it's fairly
> > self-explanatory, and having pending_funcalls run on other threads is
> > clearly wrong.
> 
> Can't say I understood the scenario, but then I'm not an expert on
> native-compilation's low-level details.  Adding Andrea, in the hope
> that he understands better.
> 
> (How can native--compile-async run "on another thread"?)
> 
> 
> 
> 

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