GNU bug report logs - #22865
25.0.91; Use Proof General with emacs-25 on OS X frequent hangs coqtop

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: John Wiegley <jwiegley <at> gmail.com>
Subject: bug#22865: closed (Re: bug#22865: 25.0.91; Use Proof General with
 emacs-25 on OS X frequent hangs coqtop)
Date: Sun, 06 Mar 2016 04:58:02 +0000

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Your bug report

#22865: 25.0.91; Use Proof General with emacs-25 on OS X frequent hangs coqtop

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 22865 <at> debbugs.gnu.org.

-- 
22865: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=22865
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: John Wiegley <jwiegley <at> gmail.com>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: Clément Pit--Claudel <cpitcla <at> csail.mit.edu>,
 22865-done <at> debbugs.gnu.org, YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>
Subject: Re: bug#22865: 25.0.91;
 Use Proof General with emacs-25 on OS X frequent hangs coqtop
Date: Sat, 05 Mar 2016 20:53:27 -0800

>>>>> Paul Eggert <eggert <at> cs.ucla.edu> writes:

> Hmm, I suppose it is, though it's no longer a blocker for the release. I'll
> reopen the bug report.

Thank you, Paul.

-- 
John Wiegley                  GPG fingerprint = 4710 CF98 AF9B 327B B80F
http://newartisans.com                          60E1 46C4 BD1A 7AC1 4BA2

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From: John Wiegley <jwiegley <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.91; Use Proof General with emacs-25 on OS X frequent hangs coqtop
Date: Mon, 29 Feb 2016 18:02:35 -0800

I'm afraid this could be difficult to debug, but here is my scenario:

 1. Open a .v (Coq) file within my project.

 2. Ask Proof General to evaluate the file to the end.

 3. Before a certain definition, PG will hang waiting on a response from
    "coqtop", the evaluator. Checking the process list shows that this
    process is not doing anything.

 4. Once this happens, C-g or C-c C-c to abort the evaluation leaves me
    in a broken state where nothing can evaluate anymore. The only
    recourse is to "killall coqtop", and then attempt the evaluation
    again. However, the same definition always causes it to hang. There
    is no common factor about the definitions that I can see, but it
    happens reliably every time for each file where it does occur.

if I switch to 24.5, everything evaluates fine. It happens quite
frequently with emacs-25, but never with 24.5.

Now, this could be 25.1, or it could be Mac port vs. NeXTstep, or it
could be some other subtle interaction with my environment.

Unfortunately this will take time to narrow down, and I have to get the
Coq code written, so for now this is a placeholder and I must revert to
using 24.5. I hope to come back to this later, especially if others have
ideas on where to look.

John

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