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

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From: Spencer Baugh <sbaugh <at> janestreet.com>
To: 79228 <at> debbugs.gnu.org
Cc: John Wiegley <johnw <at> gnu.org>
Subject: bug#79228: 30.1.90; native--compile-async sentinel can error if threads are running
Date: Tue, 12 Aug 2025 17:56:29 -0400

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.

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