GNU bug report logs - #21688
25.0.50; abort in regex.c during "align"

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#21802: closed (25.0.50; segfault in regex.c triggered by an
 isearch)
Date: Wed, 25 Nov 2015 08:11:03 +0000

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Your message dated Wed, 25 Nov 2015 00:10:25 -0800
with message-id <56556CF1.6030800 <at> cs.ucla.edu>
and subject line Re: [Emacs-diffs] emacs-25 8e84823: Revert regexp reentrancy abort patch
has caused the debbugs.gnu.org bug report #21688,
regarding 25.0.50; segfault in regex.c triggered by an isearch
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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21688: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=21688
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From: Dima Kogan <dima <at> secretsauce.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.50; segfault in regex.c triggered by an isearch
Date: Sun, 01 Nov 2015 01:36:45 -0800

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Hi. I'm running a recent emacs built from git:

  https://github.com/emacs-mirror/emacs/commit/6e2a402

I'm on a Debian machine, running the GTK build of emacs. Segfault
recipe:

1. emacs -Q /tmp/feedgnuplot (source attached)
2. M-x cperl-mode
3. C-s last if /^exit/ C-s

   Type out the string "last if /^exit/". It may crash while you're
   typing it, or it may reach the end of the string in the match on line
   431. Hit C-s again after you typed it. If it didn't crash already,
   the extra C-s makes it crash.

I haven't done any debugging other than to look at the backtrace.
Relevant chunks:

    #0  0x00007ffff03f8107 in __GI_raise (sig=sig <at> entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
    #1  0x00007ffff03f94e8 in __GI_abort () at abort.c:89
    #2  0x000000000053c3e5 in re_match_2_internal (bufp=bufp <at> entry=0xb93fc0, string1=string1 <at> entry=0x28bbca0 "#!/usr/bi:HiRes qw( usleep gettimeofday tv_interval );\nuse IO::Handle;\nuse List::Util qw( "..., size1=size1 <at> entry=0, strinrnings;\nuse Getopt::Long;\nuse Time::HiRes qw( usleep gettimeofday tv_interval );\nuse IO::Handle;\nuse List::Util
    #3  0x0000000000543b52 in re_search_2 (bufp=bufp <at> entry=0xb93fc0, str1=str1 <at> entry=0x28bbca0 "#!/usr/bin/perl\n\npackeep gettimeofday tv_interval );\nuse IO::Handle;\nuse List::Util qw( "..., size1=size1 <at> entry=0, str2=str2 <at> entry=0x2:Long;\nuse Time::HiRes qw( usleep gettimeofday tv_interval );\nuse IO::Handle;\nuse List::Util qw( "..., size2=siz
    #4  0x0000000000539522 in search_buffer (string=string <at> entry=42306836, pos=<optimized out>, pos_byte=<optimized out
        at search.c:1265
    #5  0x0000000000539e8f in search_command (string=42306836, bound=<optimized out>, noerror=44160, count=<optimized o
    #6  0x000000000053a08b in Fre_search_forward (regexp=<optimized out>, bound=<optimized out>, noerror=<optimized out

The significant-looking pieces are in regex.c and search.c.

[feedgnuplot (application/octet-stream, attachment)]

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>, 21688-done <at> debbugs.gnu.org
Subject: Re: [Emacs-diffs] emacs-25 8e84823: Revert regexp reentrancy abort
 patch
Date: Wed, 25 Nov 2015 00:10:25 -0800

Stefan Monnier wrote:
> I think Bug#21688 can be re-closed.

Thanks, reclosing.

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