GNU bug report logs - #27585
segfault when evaluating a file containing only backticks

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Message #67 received at 27585-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Steve Kemp <steve <at> steve.org.uk>
Cc: 27585-done <at> debbugs.gnu.org
Subject: Re: bug#27585: segfault when evaluating a file containing only
 backticks
Date: Fri, 14 Jul 2017 05:09:34 -0700

[Message part 1 (text/plain, inline)]

Thanks for reporting the bug. I reproduced the problem on Fedora 26 x86-64, 
fixed it in master by applying the attached patch, and am boldly marking the bug 
as fixed.

As Eli and Daniel mentioned, this area of Emacs cannot be 100% reliable and to 
some extent is indeed a "ticking time bomb". That being said, the problem in 
this particular case was that Emacs had a bad heuristic for guessing whether a 
segmentation violation address was due to stack overflow on GNU/Linux. This bad 
heuristic has been in place for years without anybody reporting it. It's good 
that we fixed this bug (though I hope "normal" users never notice the bug fix :-).

[0001-Improve-stack-overflow-heuristic-on-GNU-Linux.patch (text/x-patch, attachment)]

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