Segfault during emacs compile

Segfault during emacs compile

[Toke Høiland-Jørgensen]

When compiling emacs from git I get a segfault on the ./temacs command.
Running it from gdb and getting a backtrace yields (from the emacs/src dir):

$  gdb ./temacs 
GNU gdb (GDB) 7.8.1
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Reading symbols from ./temacs...done.
SIGINT is used by the debugger.
Are you sure you want to change it? (y or n) [answered Y; input not from terminal]
DISPLAY = :0
TERM = rxvt
Breakpoint 1 at 0x1114c0: file emacs.c, line 360.
Temporary breakpoint 2 at 0x12ce10: file sysdep.c, line 911.
(gdb) set args --batch --load loadup bootstrap
(gdb) run
Starting program: /home/alrua/git/emacs/src/temacs --batch --load loadup bootstrap
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
process 9093 is executing new program: /home/alrua/git/emacs/src/temacs
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Loading loadup.el (source)...
Using load-path (/home/alrua/git/emacs/lisp /home/alrua/git/emacs/lisp/emacs-lisp /home/alrua/git/emacs/lisp/language /home/alrua/git/emacs/lisp/international /home/alrua/git/emacs/lisp/textmodes /home/alrua/git/emacs/lisp/vc)
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Loading /home/alrua/git/emacs/lisp/files.el (source)...
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../lisp/minibuffer.el: `with-wrapper-hook' is an obsolete macro (as of 24.4); use a <foo>-function variable modified by `add-function'.
Loading /home/alrua/git/emacs/lisp/abbrev.el (source)...
../lisp/abbrev.el: `with-wrapper-hook' is an obsolete macro (as of 24.4); use a <foo>-function variable modified by `add-function'.
Loading /home/alrua/git/emacs/lisp/simple.el (source)...
../lisp/simple.el: `with-wrapper-hook' is an obsolete macro (as of 24.4); use a <foo>-function variable modified by `add-function'.
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Finding pointers to doc strings...
Finding pointers to doc strings...done
Dumping under the name emacs

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff02dc626 in __memcpy_avx_unaligned () from /usr/lib/libc.so.6
(gdb) bt
#0  0x00007ffff02dc626 in __memcpy_avx_unaligned () from /usr/lib/libc.so.6
#1  0x000055555571934a in memcpy (__len=<optimized out>, __src=<optimized out>, __dest=<optimized out>) at /usr/include/bits/string3.h:51
#2  unexec (new_name=0x555556bb60c8 "/home/alrua/git/emacs/src/emacs", old_name=0x555556bb60f0 "/home/alrua/git/emacs/src/temacs") at unexelf.c:1060
#3  0x0000555555661bc7 in Fdump_emacs (filename=93825015994097, symfile=93825015994065) at emacs.c:2116
#4  0x00005555556e00b5 in eval_sub (form=<optimized out>) at eval.c:2181
#5  0x00005555556e0605 in Fprogn (body=140735306793344) at eval.c:455
#6  0x00005555556e0207 in eval_sub (form=<optimized out>) at eval.c:2128
#7  0x00005555556e0207 in eval_sub (form=form@entry=93825000984726) at eval.c:2128
#8  0x0000555555707455 in readevalloop (readcharfun=93825000862690, stream=0x555555dc28f0, sourcename=93825001069473, printflag=false, unibyte=<optimized out>, readfun=93825000762226, start=93825000762226, end=93825000762226) at lread.c:1967
#9  0x0000555555707f49 in Fload (file=140735306793344, noerror=4686208, nomessage=3082340, nosuffix=93825001072880, must_suffix=93825000460736) at lread.c:1362
#10 0x00005555556e002e in eval_sub (form=form@entry=93825000984614) at eval.c:2192
#11 0x00005555556e28e3 in Feval (form=93825000984614, lexical=<optimized out>) at eval.c:1993
#12 0x00005555556dee07 in internal_condition_case (bfun=bfun@entry=0x555555665cc0 <top_level_2>, handlers=<optimized out>, hfun=hfun@entry=0x55555566ace0 <cmd_error>) at eval.c:1344
#13 0x0000555555665c9d in top_level_1 (ignore=ignore@entry=93825000762226) at keyboard.c:1214
#14 0x00005555556decd3 in internal_catch (tag=93825000809890, func=func@entry=0x555555665c30 <top_level_1>, arg=93825000762226) at eval.c:1105
#15 0x0000555555665bac in command_loop () at keyboard.c:1175
#16 0x000055555566a86d in recursive_edit_1 () at keyboard.c:786
#17 0x000055555566abf0 in Frecursive_edit () at keyboard.c:857
#18 0x0000555555585012 in main (argc=1439879616, argv=0x7fffffffde58) at emacs.c:1623

Lisp Backtrace:
"dump-emacs" (0xffffd5f0)
"progn" (0xffffd6d8)
"if" (0xffffd7b8)
"load" (0xffffdb10)
(gdb) 


This is on x86_64 Arch Linux. Any ideas as to how I go about debugging
this?

Thanks,
-Toke