Re: Emacs seems awfully unstable on OS X lately

[Jan Djärv]

Hello.

16 sep 2012 kl. 02:47 skrev Harald Hanche-Olsen <address@hidden>:

> 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.
> 

I see craches also, but haven't been able to reproduce it when running with gdb.

> 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 ?? ()
> 

This usually means that an object was freed and after that someone tried to 
send it a signal (i.e. method call).

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

Actually it is informative, the memory isn't handeled right in this case. I'll 
figure out a solution and check in a fix.

Thanks,

        Jan D.

> - 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