bug#18501: 24.3.93; OS X; crash in free() when calling macfont_close()

[Jim Radford]

I often see Emacs use 100% of my CPU after closing emacsclient-opened
windows.  Here's a backtrace when I connect to the looping process.

* thread #1: tid = 0x149297, 0x0000000100142d8b Emacs`hash_lookup [inlined] 
AREF(array=4391639061) at lisp.h:1356, queue = 'com.apple.main-thread', stop 
reason = EXC_BAD_ACCESS (code=1, address=0x30ecf2338)
* frame #0: 0x0000000100142d8b Emacs`hash_lookup [inlined] 
AREF(array=4391639061) at lisp.h:1356
  frame #1: 0x0000000100142d8b Emacs`hash_lookup [inlined] 
HASH_INDEX(h=0x0000000101818990) at lisp.h:1844
  frame #2: 0x0000000100142d8b Emacs`hash_lookup(h=0x0000000101818990, 
key=4370859418, hash=<unavailable>) + 59 at fns.c:3807
  frame #3: 0x00000001000874f2 
Emacs`code_convert_string(string=140734799784416, coding_system=4370859418, 
dst_object=4320145514, encodep=false, nocopy=<unavailable>, norecord=true) + 
194 at coding.c:9450
  frame #4: 0x00000001000ecf8e Emacs`Fexpand_file_name(name=<unavailable>, 
default_directory=<unavailable>) + 878 at fileio.c:1176
  frame #5: 0x00000001000eccfe Emacs`Fexpand_file_name(name=4319204161, 
default_directory=<unavailable>) + 222 at fileio.c:981
  frame #6: 0x00000001000f3e7e Emacs`Fdo_auto_save(no_message=<unavailable>, 
current_only=4320145466) + 286 at fileio.c:5560
  frame #7: 0x00000001000b789f Emacs`shut_down_emacs(sig=6, stuff=4320145466) + 
239 at emacs.c:2026
  frame #8: 0x00000001000b7699 Emacs`terminate_due_to_signal(sig=6, 
backtrace_limit=40) + 89 at emacs.c:362
  frame #9: 0x00000001000d6436 Emacs`deliver_fatal_thread_signal [inlined] 
handle_fatal_signal(sig=6) + 134 at sysdep.c:1630
  frame #10: 0x00000001000d642f Emacs`deliver_fatal_thread_signal [inlined] 
deliver_thread_signal + 119 at sysdep.c:1604
  frame #11: 0x00000001000d63b8 
Emacs`deliver_fatal_thread_signal(sig=<unavailable>) + 8 at sysdep.c:1642
  frame #12: 0x00007fff8d11a5aa libsystem_platform.dylib`_sigtramp + 26
  frame #13: 0x00007fff8bb1c867 libsystem_kernel.dylib`__pthread_kill + 11
  frame #14: 0x00007fff90cbeb1a libsystem_c.dylib`abort + 125
  frame #15: 0x00007fff90b0f07f libsystem_malloc.dylib`free + 411
  frame #16: 0x00000001001c6108 Emacs`macfont_close(font=<unavailable>) + 280 
at macfont.m:2631
  frame #17: 0x000000010011be9d Emacs`Fgarbage_collect [inlined] cleanup_vector 
+ 38 at alloc.c:2935
  frame #18: 0x000000010011be77 Emacs`Fgarbage_collect [inlined] sweep_vectors 
+ 572 at alloc.c:2986
  frame #19: 0x000000010011bc3b Emacs`Fgarbage_collect [inlined] gc_sweep + 239 
at alloc.c:6721
  frame #20: 0x000000010011bb4c Emacs`Fgarbage_collect + 6172 at alloc.c:5650
  frame #21: 0x0000000100170c1a Emacs`exec_byte_code [inlined] maybe_gc + 1338 
at lisp.h:4564

In GNU Emacs 24.3.93.1 (x86_64-apple-darwin13.3.0, NS apple-appkit-1265.21)
Configured using:
 `configure --with-ns'