GNU bug report logs - #79367
31.0.50; magit-commit sometimes doesn't work if diff-hl-update-async is t

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Message #158 received at 79367 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Zhengyi Fu <i <at> fuzy.me>
Cc: sbaugh <at> janestreet.com, 79367 <at> debbugs.gnu.org, dmitry <at> gutov.dev
Subject: Re: bug#79367: 31.0.50; magit-commit sometimes doesn't work if
 diff-hl-update-async is t
Date: Sat, 06 Sep 2025 12:44:29 +0300

> From: Zhengyi Fu <i <at> fuzy.me>
> Cc: sbaugh <at> janestreet.com,  dmitry <at> gutov.dev,  79367 <at> debbugs.gnu.org
> Date: Sat, 06 Sep 2025 16:28:40 +0800
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> From: Zhengyi Fu <i <at> fuzy.me>
> >> Cc: sbaugh <at> janestreet.com,  dmitry <at> gutov.dev,  79367 <at> debbugs.gnu.org
> >> Date: Sat, 06 Sep 2025 13:35:49 +0800
> >> 
> >> Eli Zaretskii <eliz <at> gnu.org> writes:
> >> 
> >> >> From: Zhengyi Fu <i <at> fuzy.me>
> >> >> Cc: sbaugh <at> janestreet.com,  dmitry <at> gutov.dev,  79367 <at> debbugs.gnu.org
> >> >> Date: Fri, 05 Sep 2025 21:36:16 +0800
> >> >> 
> >> >> Eli Zaretskii <eliz <at> gnu.org> writes:
> >> >> 
> >> >> > Thanks, then please show the value of the offending descriptor which
> >> >> > causes the assertion violation.  For that, please run Emacs udner GDB,
> >> >> > perform the recipe that reproduces the problem, and then type these
> >> >> > GDB commands:
> >> >> >
> >> >> >  (gdb) frame 1
> >> >> >  (gdb) print p->infd
> >> >> >
> >> >> > and tell what that produces.
> >> >> 
> >> >> The p->infd value is 8.
> >> >
> >> > OK, please repeat this several times to make sure it's always 8.
> >> >
> >> > If it is, then let's try to see which code leaves the .thread field
> >> > uncleared.  Like this (please run from the src directory where you
> >> > have the 'emacs' executable you have built):
> >> >
> >> >   $ gdb ./emacs
> >> >   ...
> >> >   (gdb) break process.c:8731
> >> >   (gdb) run
> >> >
> >> > Emacs will start and stop in init_process_emacs, on line 8731 of
> >> > process.c.  Then:
> >> >
> >> >   (gdb) watch fd_callback_info[8].thread
> >> >   (gdb) commands
> >> >    > bt 5
> >> >    > continue
> >> >    > end
> >> >   (gdb) continue
> >> >
> >> > The above sets a watchpoint which will stop Emacs each time we assign
> >> > some value to fd_callback_info[8].thread, and GDB will then show the
> >> > first 5 frames of the call-stack, then continue.  Now run your recipe,
> >> > until it gets SIGABRT, and post everything GDB produced until that
> >> > point.  I hope that will tell us which code fails to clear the .thread
> >> > member.
> >> >
> >> > Thanks.
> >> 
> >> The fd is 8 when running Emacs in terminal.
> >> The fd is always 16 when running Emacs in X11.
> >
> > Thanks, please try the patch below, instead of the incorrect one I
> > asked you to try before:
> >
> > diff --git a/src/process.c b/src/process.c
> > index fa003c2..736098f 100644
> > --- a/src/process.c
> > +++ b/src/process.c
> > @@ -4831,7 +4831,11 @@ deactivate_process (Lisp_Object proc)
> >    /* Beware SIGCHLD hereabouts.  */
> >  
> >    for (i = 0; i < PROCESS_OPEN_FDS; i++)
> > -    close_process_fd (&p->open_fd[i]);
> > +    {
> > +      fd_callback_info[p->open_fd[i]].thread = NULL;
> > +      fd_callback_info[p->open_fd[i]].waiting_thread = NULL;
> > +      close_process_fd (&p->open_fd[i]);
> > +    }
> >  
> >    inchannel = p->infd;
> >    eassert (inchannel < FD_SETSIZE);
> 
> This resolves the problem. The assertion failure no longer occurs when testing with the patch.

Thanks, now installed on the master branch.

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