Re: Emacs seems awfully unstable on OS X lately

[Harald Hanche-Olsen]

Well, after a day of testing I am inclined to blame revision 109972
for the instability on OS X. At least, I get crashes with that
revision and later ones, and so far I haven't seen any crashes with
earlier revisions. I am running on revision 109971 now. I'll probably
have to use it for several hours before I can feel confident in this
conclusion, however.

Now I know nothing about Objective C, but the added code in nsterm.m
doesn't look to me like something that would cause crashes.

However that may be, I managed to provoke a crash with gdb attached,
but didn't get a useful backtrace; only this:

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000011
0x00007fff8fc7ae90 in objc_msgSend ()
(gdb) back
#0  0x00007fff8fc7ae90 in objc_msgSend ()
#1  0x0000000000000000 in ?? ()

The backtrace supplied by the OS X crash reporter is a lot more
informative, I suppose. I supply it below.

- Harald


Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib              0x00007fff89aa782a __kill + 10
1   org.gnu.Emacs                       0x00000001000ad57e 
fatal_error_backtrace + 254 (emacs.c:332)
2   org.gnu.Emacs                       0x00000001000ca6e3 emacs_abort + 19
3   org.gnu.Emacs                       0x000000010019ca2d ns_term_shutdown + 
125
4   org.gnu.Emacs                       0x00000001000adbba shut_down_emacs + 
250 (emacs.c:2066)
5   org.gnu.Emacs                       0x00000001000ad531 
fatal_error_backtrace + 177 (emacs.c:315)
6   org.gnu.Emacs                       0x00000001000afc3e handle_fatal_signal 
+ 14
7   org.gnu.Emacs                       0x00000001000ca953 
handle_on_main_thread + 131 (sysdep.c:1551)
8   libsystem_c.dylib                   0x00007fff90ebccfa _sigtramp + 26
9   libobjc.A.dylib                     0x00007fff8fc7ae90 objc_msgSend + 16
10  org.gnu.Emacs                       0x000000010019a1d2 ns_update_begin + 
146 (nsterm.m:644)
11  org.gnu.Emacs                       0x000000010000ade5 update_frame + 213 
(dispnew.c:3187)
12  org.gnu.Emacs                       0x0000000100042668 redisplay_internal + 
4696 (xdisp.c:13559)
13  org.gnu.Emacs                       0x00000001000bd7da read_char + 8410 
(keyboard.c:2496)
14  org.gnu.Emacs                       0x00000001000c07d1 read_key_sequence + 
7521
15  org.gnu.Emacs                       0x00000001000c2278 command_loop_1 + 
5192 (keyboard.c:1498)
16  org.gnu.Emacs                       0x0000000100129226 
internal_condition_case + 294 (eval.c:1320)
17  org.gnu.Emacs                       0x00000001000c0e0e command_loop_2 + 62 
(keyboard.c:1194)
18  org.gnu.Emacs                       0x000000010012932b internal_catch + 219 
(eval.c:1076)
19  org.gnu.Emacs                       0x00000001000c28cd recursive_edit_1 + 
301 (keyboard.c:1158)
20  org.gnu.Emacs                       0x00000001000e09da read_minibuf + 2346 
(minibuf.c:686)
21  org.gnu.Emacs                       0x00000001000dde65 
Fread_from_minibuffer + 245 (minibuf.c:988)
22  org.gnu.Emacs                       0x00000001000ddfce Fread_string + 110 
(minibuf.c:1053)
23  org.gnu.Emacs                       0x00000001001277c7 Ffuncall + 1047 
(eval.c:2825)
24  org.gnu.Emacs                       0x000000010015ff08 exec_byte_code + 
1992 (bytecode.c:898)
25  org.gnu.Emacs                       0x000000010012aa62 funcall_lambda + 930 
(eval.c:3041)
26  org.gnu.Emacs                       0x0000000100127857 Ffuncall + 1191 
(eval.c:2858)
27  org.gnu.Emacs                       0x0000000100124854 Fcall_interactively 
+ 6004 (callint.c:853)
28  org.gnu.Emacs                       0x0000000100127793 Ffuncall + 995 
(eval.c:2816)
29  org.gnu.Emacs                       0x000000010012abe6 call3 + 38 
(eval.c:2634)
30  org.gnu.Emacs                       0x00000001000c1475 command_loop_1 + 
1605 (keyboard.c:1634)
31  org.gnu.Emacs                       0x0000000100129226 
internal_condition_case + 294 (eval.c:1320)
32  org.gnu.Emacs                       0x00000001000c0e0e command_loop_2 + 62 
(keyboard.c:1194)
33  org.gnu.Emacs                       0x000000010012932b internal_catch + 219 
(eval.c:1076)
34  org.gnu.Emacs                       0x00000001000c2890 recursive_edit_1 + 
240 (keyboard.c:1173)
35  org.gnu.Emacs                       0x00000001000b2e9d Frecursive_edit + 
237 (keyboard.c:857)
36  org.gnu.Emacs                       0x00000001000afb8c main + 6316 
(emacs.c:1660)
37  org.gnu.Emacs                       0x00000001000018a4 start + 52