Re: Mac OSX running Carbon crash with today's CVS

[Gabriel Foster <gabriel@apple.com>]

On Tuesday, April 22, 2003, at 01:05 AM, Eli Zaretskii wrote:

>> Date: Mon, 21 Apr 2003 15:21:40 -0700
>> From: Gabriel Foster <gabriel@apple.com>
>>
>> 	I'm gettting a random but fairly consistent crash on Mac OSX, built
>> from today's CVS.
>
> Are all of them in the same place in the code, i.e. during garbage
> collection?
>
>> (gdb) list
>> 4299
>> 4300    #if (GC_MARK_STACK == GC_USE_GCPROS_AS_BEFORE \
>> 4301         || GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES)
>> 4302      for (tail = gcprolist; tail; tail = tail->next)
>> 4303        for (i = 0; i < tail->nvars; i++)
>> 4304          XUNMARK (tail->var[i]);
>> 4305    #endif
>> 4306
>> 4307      unmark_byte_stack ();
>> 4308      for (backlist = backtrace_list; backlist; backlist =
>> backlist->next)
>> (gdb) print tail
>> $1 = (struct gcpro *) 0xbfffde90
>> (gdb) print tail->nvars
>> $2 = 1168308
>> (gdb) print i
>> $3 = 7289
>> (gdb)
>
> How about
>
>   (gdb) print tail->var[i]
>
> Also, please try to describe what are you doing in Emacs when these
> crashes happen.
>

In the most recent case, I had just hit the enter key.

Program received signal EXC_BAD_ACCESS, Could not access memory.
0x000c4630 in Fgarbage_collect () at alloc.c:4197
4197          if (!XMARKBIT (tail->var[i]))
(gdb) print i
$1 = 0
(gdb) print tail
$2 = (struct gcpro *) 0xbfffde20
(gdb) print *tail->var[i]
Cannot access memory at address 0x1
(gdb) print tail->var[i]
Cannot access memory at address 0x1
(gdb) print tail->var
$3 = (volatile int *) 0x1
(gdb) where
#0  0x000c4630 in Fgarbage_collect () at alloc.c:4197
#1  0x0010c60c in Fbyte_code (bytestr=275966772, vector=130, 
maxdepth=-1073757728) at bytecode.c:744
#2  0x000dca34 in funcall_lambda (fun=1108651152, nargs=3, 
arg_vector=0xbfffc404) at eval.c:2910
#3  0x000dc4f8 in Ffuncall (nargs=1381796708, args=0xbfffc400) at 
eval.c:2780
#4  0x0010c558 in Fbyte_code (bytestr=274992596, vector=3, 
maxdepth=-1073757184) at bytecode.c:709
#5  0x000dca34 in funcall_lambda (fun=1108648928, nargs=3, 
arg_vector=0xbfffc624) at eval.c:2910
#6  0x000dc4f8 in Ffuncall (nargs=1381796708, args=0xbfffc620) at 
eval.c:2780
#7  0x0010c558 in Fbyte_code (bytestr=274992596, vector=3, 
maxdepth=-1073756640) at bytecode.c:709
#8  0x000dca34 in funcall_lambda (fun=1080299968, nargs=2, 
arg_vector=0xbfffc978) at eval.c:2910
#9  0x000dc4f8 in Ffuncall (nargs=1381796708, args=0xbfffc974) at 
eval.c:2780
#10 0x000dbac8 in run_hook_with_args (nargs=3, args=0xbfffc974, 
cond=to_completion) at eval.c:2393
#11 0x000dc3a8 in Ffuncall (nargs=1381796708, args=0xbfffc970) at 
eval.c:2726
#12 0x0010c558 in Fbyte_code (bytestr=276103540, vector=3, 
maxdepth=-1073755792) at bytecode.c:709
#13 0x000dca34 in funcall_lambda (fun=1101781200, nargs=2, 
arg_vector=0xbfffcb94) at eval.c:2910
#14 0x000dc4f8 in Ffuncall (nargs=1381796708, args=0xbfffcb90) at 
eval.c:2780
#15 0x0010c558 in Fbyte_code (bytestr=303377588, vector=2, 
maxdepth=-1073755248) at bytecode.c:709
#16 0x000dca34 in funcall_lambda (fun=1101780992, nargs=1, 
arg_vector=0xbfffd2a4) at eval.c:2910
#17 0x000dc4f8 in Ffuncall (nargs=1381796708, args=0xbfffd2a0) at 
eval.c:2780
#18 0x000d9fb4 in internal_condition_case_2 (bfun=0xdc0d8 <Ffuncall>, 
nargs=2, args=0xbfffd2a0, handlers=275715844, hfun=0x16bf8 
<safe_eval_handler>) at eval.c:1418
#19 0x00016de4 in safe_call (nargs=2, args=0xbfffd2a0) at xdisp.c:1789
#20 0x00016e34 in safe_call1 (fn=1381796708, arg=275715796) at 
xdisp.c:1809
#21 0x000184f8 in handle_fontified_prop (it=0x525c8b64) at xdisp.c:2711
#22 0x00017f24 in handle_stop (it=0xbfffd560) at xdisp.c:2472
#23 0x0001c4ec in next_element_from_buffer (it=0x157608) at xdisp.c:5274
#24 0x0001b82c in get_next_display_element (it=0xbfffd560) at 
xdisp.c:4626
#25 0x0002cd50 in display_line (it=0xbfffd560) at xdisp.c:14242
#26 0x000291e4 in try_window (window=1381796708, pos={charpos = 2710, 
bytepos = 2710}) at xdisp.c:11981
#27 0x00028408 in redisplay_window (window=1101750720, 
just_this_one_p=1) at xdisp.c:11639
#28 0x000253cc in redisplay_window_1 (window=1381796708) at 
xdisp.c:10409
#29 0x000d9e40 in internal_condition_case_1 (bfun=0x25390 
<redisplay_window_1>, arg=1101750720, handlers=1349614436, hfun=0x25300 
<redisplay_window_error>) at eval.c:1374
#30 0x00024a14 in redisplay_internal (preserve_echo_area=1381796708) at 
xdisp.c:10035
#31 0x00075f00 in read_char (commandflag=1, nmaps=2, maps=0xbfffebd0, 
prev_event=275715796, used_mouse_menu=0xbfffecd4) at keyboard.c:2473
#32 0x0007e45c in read_key_sequence (keybuf=0xbfffeda0, 
bufsize=2373924, prompt=275715796, dont_downcase_last=2384204, 
can_return_switch_frame=1, fix_current_buffer=2371724) at 
keyboard.c:8583
#33 0x00073d5c in command_loop_1 () at keyboard.c:1502
#34 0x000d9cd4 in internal_condition_case (bfun=0x73918 
<command_loop_1>, handlers=275762388, hfun=0x732c8 <cmd_error>) at 
eval.c:1333
#35 0x000736f8 in command_loop_2 () at keyboard.c:1290
#36 0x000d9744 in internal_catch (tag=1381796708, func=0x736b8 
<command_loop_2>, arg=275715796) at eval.c:1094
#37 0x00073650 in command_loop () at keyboard.c:1269
#38 0x00073064 in recursive_edit_1 () at keyboard.c:985
#39 0x000731ec in Frecursive_edit () at keyboard.c:1041
#40 0x00071cc0 in main (argc=0, argv=0xbffffa44) at emacs.c:1659
#41 0x00003ae8 in _start (argc=50, argv=0x0, envp=0x2405b4) at 
/SourceCache/Csu/Csu-45/crt.c:267
#42 0x00003968 in start ()



> Thanks.