Re: Investigating crash (Bug#11395) on Mac OS

[Ivan Andrus <darthandrus@gmail.com>]

On May 4, 2012, at 12:38 PM, Chong Yidong wrote:

> Ivan Andrus <darthandrus@gmail.com> writes:
> 
>> I was getting this quite regularly (about every 15 minutes) a week ago
>> (from bzr head), but after I got done traveling (Tuesday) I updated
>> and I haven't experienced it since.  I assumed someone had fixed it so
>> I didn't bother reporting it.  In the past several years it has been
>> very stable updating from bzr head every so often.  So at least for me
>> it's been very version dependent.
> 
> If this is right, there may have been a fix committed to trunk but
> missing from the release branch (since Bug#11395 was reported for the
> 24.0.96 pretest).
> 
> If you can, please try bisecting.  That would help tremendously.  The
> (so far incomplete) recipe posted by Richard Stanton in the bug page for
> Bug#11395 may help if you can reproduce it.

My attempts at bisecting were an utter failure.  First I had problems building after using bzr bisect so I decided to bisect "manually".  I was able to easily reproduce the problem with some revisions e.g. 108034 by repeatedly exporting an org file to pdf (only required 3-5 exports).  I was unable (after 10-15 exports) to reproduce the problem with other revisions e.g. 108049.  I had to leave it though, and now that I come back to it I can't reproduce the problem with revision 108034.  So there's something weird going on.

FWIW I was trying to bisect "backwards" by finding the revision where it was fixed for me.  There were far fewer commits that way since I hadn't previously updated for about a month.

>> IIRC running it under valgrind, which would be my first instinct,
>> isn't supported.
> 
> Running `valgrind ./temacs -l loadup' works for me (apart from the usual
> cloud of false positives due to GC).  But maybe it doesn't work on Mac
> OS, I dunno.


That's good to know.  But `valgrind ./emacs` wouldn't work I assume?  Anyway, I'll try it later if I can reproduce the error.

-Ivan