Re: help debugging a segfault

[Sam Halliday]

On Monday, 17 October 2016 21:16:35 UTC+1, Sam Halliday  wrote:
> 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);
... 
> Could anybody please shed some light on what could be going wrong? I also 
> have a core dump file but I have no idea what to do with it, I've never used 
> gdb in anger.

Typing "bt" when loading the coredump gives

(gdb) bt
#0  0x00007fe8cbfabf5f in ?? ()
#1  0x00000000005da106 in mapcar1 (leni=11, vals=<optimized out>, fn=40, 
seq=498) at fns.c:2494
#2  0xffffffffffffffff in ?? ()
#3  0xffffffffffffffff in ?? ()
#4  0xffffffffffffffff in ?? ()
#5  0xffffffffffffffff in ?? ()
#6  0xffffffffffffffff in ?? ()
#7  0xffffffffffffffff in ?? ()
#8  0xffffffffffffffff in ?? ()
#9  0x000000000000000b in ?? ()
#10 0x00000000004ee994 in Finternal_merge_in_global_face (face=2, 
frame=12113136) at xfaces.c:3669
#11 0x0000000000000000 in ?? ()