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Re: help debugging a segfault

From: Eli Zaretskii
Subject: Re: help debugging a segfault
Date: Tue, 18 Oct 2016 08:45:19 +0300

> Date: Mon, 17 Oct 2016 13:16:33 -0700 (PDT)
> From: Sam Halliday <>
> Despite being very stable since I installed it when released, Emacs 25.1 has 
> started to segfault on me this week in a hard-to-reproduce manner.
> I use ArchLinux and I recompiled with debugging symbols to obtain a detailed 
> core dump / crash log.
> But this is all I got when running with gdb until it crashed:
> =============================
> Thread 1 "emacs" received signal SIGSEGV, Segmentation fault.
> re_search_2 (bufp=bufp@entry=0xc2d460 <searchbufs+2912>, 
> str1=str1@entry=0x597b790 <error: Cannot access memory at address 0x597b790>, 
> size1=size1@entry=0, 
>     str2=str2@entry=0x597b790 <error: Cannot access memory at address 
> 0x597b790>, size2=65565, startpos=646, startpos@entry=623, range=509, 
>     regs=0xc2c8d0 <search_regs>, stop=1155) at regex.c:4464
> 4464                int len = BYTES_BY_CHAR_HEAD (*p);
> =============================

Sounds like another case of bug#24358, see

and the following discussion.  Your OS is also the same as reported
there, which increases the probability of this being the same issue.

If you ever succeed in getting meaningful data about the crash, or
some way of reproducing it, please post to

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