(Emacs version 2013-07-04)

(gdb) run -f wl
Starting program: /export/CHROOT/usr/pkgsrc/wip/emacs-current/work/emacs/src/emacs -f wl

Program received signal SIGSEGV, Segmentation fault.
[Switching to LWP 1]
0x00007f7fec4ec12a in memmove () from /usr/lib/libc.so.12
(gdb) bt
#0  0x00007f7fec4ec12a in memmove () from /usr/lib/libc.so.12
#1  0x000000000051ea45 in compact_small_strings () at /usr/include/ssp/string.h:71
#2  sweep_strings () at alloc.c:1837
#3  gc_sweep () at alloc.c:6115
#4  Fgarbage_collect () at alloc.c:5367
#5  0x0000000000533d43 in maybe_gc () at lisp.h:4320
#6  Ffuncall (nargs=<optimized out>, args=0x7f7fffff9820) at eval.c:2741
#7  0x00000000005340f5 in call1 (fn=<optimized out>, arg1=<optimized out>) at eval.c:2589
#8  0x00000000004e544b in Fget_buffer_create (buffer_or_name=<optimized out>) at buffer.c:619
#9  0x00000000004839aa in make_conversion_work_buffer (multibyte=true) at coding.c:7772
#10 code_conversion_save (with_work_buf=<optimized out>, multibyte=true) at coding.c:7823

(gdb) run -f wl
Starting program: /export/CHROOT/usr/pkgsrc/wip/emacs-current/work/emacs/src/emacs -f wl

Program received signal SIGSEGV, Segmentation fault.
[Switching to LWP 1]
compact_small_strings () at alloc.c:1906
1906              nbytes = s ? STRING_BYTES (s) : SDATA_NBYTES (from);
(gdb) bt
#0  compact_small_strings () at alloc.c:1906
#1  sweep_strings () at alloc.c:1837
#2  gc_sweep () at alloc.c:6115
#3  Fgarbage_collect () at alloc.c:5367
#4  0x0000000000533d43 in maybe_gc () at lisp.h:4320
#5  Ffuncall (nargs=<optimized out>, args=0x7f7ffffe9378) at eval.c:2741
#6 0x0000000000566835 in exec_byte_code
    (bytestr=4788563690564839285, vector=64339520,
    maxdepth=16, args_template=4611686019484352512,
    nargs=4611686018662268928, args=0x3d5bcd8) at
    bytecode.c:903
#7 0x0000000000533971 in funcall_lambda (fun=45463229,
 nargs=<optimized out>, arg_vector=0x7f7ffffe9520) at
 eval.c:3024
#8 0x0000000000533cde in Ffuncall (nargs=<optimized out>,
 args=0x7f7ffffe9518) at eval.c:2851
#9 0x0000000000566835 in exec_byte_code
    (bytestr=4788563690564839285, vector=64339520,
    maxdepth=16, args_template=4611686019484352512,
    nargs=4611686018662268928, args=0x3d5bcd8) at
    bytecode.c:903
#10 0x0000000000533971 in funcall_lambda (fun=45473989,
 nargs=<optimized out>, arg_vector=0x7f7ffffe9788) at
 eval.c:3024
#11 0x0000000000533cde in Ffuncall (nargs=<optimized out>,
 args=0x7f7ffffe9780) at eval.c:2851
#12 0x0000000000534e00 in Fapply (nargs=2, args=0x7f7ffffe9780) at eval.c:2276

gdb work/emacs/src/emacs
GNU gdb (GDB) 7.3.1
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64--netbsd".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /export/CHROOT/usr/pkgsrc/wip/emacs-current/work/emacs/src/emacs...done.
(gdb) run -f wl
Starting program: /export/CHROOT/usr/pkgsrc/wip/emacs-current/work/emacs/src/emacs -f wl

Program received signal SIGSEGV, Segmentation fault.
[Switching to LWP 1]
balance_intervals_internal (tree=0x6b6f6e6b203a6f54) at intervals.c:504
504       if (tree->left)
(gdb) bt
#0  balance_intervals_internal (tree=0x6b6f6e6b203a6f54) at intervals.c:504
#1  0x0000000000577ed2 in balance_intervals_internal (tree=0x76edfb0) at intervals.c:507
#2  0x000000000051e937 in sweep_strings () at alloc.c:1777
#3  gc_sweep () at alloc.c:6115
#4  Fgarbage_collect () at alloc.c:5367
#5  0x0000000000533d43 in maybe_gc () at lisp.h:4320
#6  Ffuncall (nargs=<optimized out>, args=0x7f7fffffa640) at eval.c:2741
#7  0x0000000000566835 in exec_byte_code (bytestr=9223372036854775807, vector=1616, maxdepth=89536936, 
    args_template=4611686019484352512, nargs=4611686018662268928, args=0xfe4e) at bytecode.c:903
#8 0x0000000000533971 in funcall_lambda (fun=37017357,
 nargs=<optimized out>, arg_vector=0x7f7fffffa7c0) at
 eval.c:3024
#9  0x0000000000533cde in Ffuncall (nargs=<optimized out>, args=0x7f7fffffa7b8) at eval.c:2851
#10 0x0000000000566835 in exec_byte_code (bytestr=9223372036854775807, vector=1616, maxdepth=89536936, 
    args_template=4611686019484352512, nargs=4611686018662268928, args=0xfe4e) at bytecode.c:903
#11 0x0000000000533971 in funcall_lambda (fun=38322741,
 nargs=<optimized out>, arg_vector=0x7f7fffffa960) at
 eval.c:3024
#12 0x0000000000533cde in Ffuncall (nargs=<optimized out>, args=0x7f7fffffa958) at eval.c:2851
#13 0x0000000000566835 in exec_byte_code (bytestr=9223372036854775807, vector=1616, maxdepth=89536936, 
    args_template=4611686019484352512, nargs=4611686018662268928, args=0xfe4e) at bytecode.c:903
#14 0x00000000005333ea in eval_sub (form=<optimized out>) at eval.c:2166