Re: emacs from head segfaults when run with -nw

[Alfred M. Szmidt]

   Thanks.  It's different from what I see, but given that this seems to
   be a Heisenbug (it disappears in a non-optimized build), perhaps it is
   not surprising.

   Can you see if this is the first GC since startup?  It is for me: if
   I set a breakpoint in Fgarbage_collect, it breaks only once, and if I
   let Emacs continue from there, it crashes in a subroutine of GC.

   Also, do you get the crash in a non-optimized (-O0) build?  It's hard
   to do anything with all those "value optimized out" variables.

Yeah I do, I'll see if I can get some time to make a patch.  Here is
the backtrace of -Q -nw compiled with -ggdb3 -O0:

Program received signal SIGSEGV, Segmentation fault.
0x081a9af5 in mem_insert (start=0x8632398, end=0x86323b0, 
type=MEM_TYPE_VECTORLIKE) at alloc.c:3557
3557          c = start < c->start ? c->left : c->right;
(gdb) bt full
#0  0x081a9af5 in mem_insert (start=0x8632398, end=0x86323b0, 
type=MEM_TYPE_VECTORLIKE) at alloc.c:3557
        c = 0x3
        parent = 0x3
        x = 0x4
#1  0x081a7942 in lisp_malloc (nbytes=24, type=MEM_TYPE_VECTORLIKE) at 
alloc.c:872
        val = 0x8632398
#2  0x081a905f in allocate_vectorlike (len=4) at alloc.c:2927
        p = 0x854fe40
        nbytes = 24
#3  0x081a90c7 in allocate_vector (nslots=4) at alloc.c:2953
        v = 0x854fe40
#4  0x081a925d in Fmake_vector (length=3, init=139319498) at alloc.c:3037
        vector = 139787845
        sizei = 4
        index = 4
        p = 0x4
#5  0x081ca166 in concat (nargs=2, args=0xbfffd9b8, 
target_type=Lisp_Vectorlike, last_special=0) at fns.c:616
        val = 139787845
        tail = 139319498
        this = 140750630
        toindex = 4
        toindex_byte = 0
        result_len = 4
        result_len_byte = 4
        argnum = 2
        last_tail = 139319498
        prev = 139319498
        some_multibyte = 0
        textprops = 0x0
        num_textprops = 0
        sa_count = 16
        sa_must_free = 0
#6  0x081c9bb6 in Fvconcat (nargs=2, args=0xbfffd9b8) at fns.c:455
No locals.
#7  0x08158532 in append_key (key_sequence=140356685, key=139719522) at 
keymap.c:1444
        args = {140356685, 140750630}
#8  0x081598f2 in accessible_keymaps_1 (key=139719522, cmd=140383118, 
args=139319498, data=0xbfffdb00) at keymap.c:2192
        d = 0xbfffdb00
        maps = 141379494
        tail = 140750190
        thisseq = 140356685
        is_metized = 0
        tem = 139319498
#9  0x08156c1c in map_keymap_item (fun=0x8159702 <accessible_keymaps_1>, 
args=139319498, key=139719522, val=140425550, data=0xbfffdb00) at keymap.c:649
No locals.
#10 0x08156d35 in map_keymap_internal (map=140428622, fun=0x8159702 
<accessible_keymaps_1>, args=139319498, data=0xbfffdb00) at keymap.c:687
        binding = 140425182
        gcpro1 = {next = 0x2, var = 0x84e4e22, nvars = -1073751368}
        gcpro2 = {next = 0x855ca3e, var = 0x84e4e22, nvars = 139319498}
        gcpro3 = {next = 0xbfffda98, var = 0x81a90c7, nvars = 0}
        tail = 140425174
#11 0x08156ed4 in map_keymap (map=140428622, fun=0x8159702 
<accessible_keymaps_1>, args=139319498, data=0xbfffdb00, autoload=0) at 
keymap.c:734
        gcpro1 = {next = 0x1, var = 0x1, nvars = 3}
#12 0x08159ca6 in Faccessible_keymaps (keymap=139312462, prefix=139319498) at 
keymap.c:2283
        data = {maps = 141384662, tail = 140750190, thisseq = 140356685, 
is_metized = 0}
        thismap = 140428622
        last = 8
        maps = 141384662
        tail = 140750190
        prefixlen = 0
#13 0x0815a8e0 in where_is_internal (definition=139689282, keymaps=140495598, 
noindirect=0, nomenus=0) at keymap.c:2738
        maps = 140495614
        found = 140495590
        data = {definition = 1, this = 4, last = 135619172, last_is_meta = 
139319498, noindirect = -1073750880, sequences = -1073751080}
#14 0x0815ad24 in Fwhere_is_internal (definition=139689282, keymap=139852222, 
firstonly=139319498, noindirect=139319498, no_remap=139319498) at keymap.c:2881
        keymaps = 140495598
        sequences = 139319498
        found = 139319498
        nomenus = 0
        gcpro1 = {next = 0xbfffdc88, var = 0x81583b6, nvars = 139312462}
        gcpro2 = {next = 0x1, var = 0x8158247, nvars = 1}
        gcpro3 = {next = 0x1, var = 0x84e4d92, nvars = 139852222}
        gcpro4 = {next = 0x855f9ae, var = 0x84dd8ca, nvars = 139852214}
        gcpro5 = {next = 0x8676010, var = 0x855f9be, nvars = 2}
        remapped_sequences = 139319498
        remapped = 0
        tem = 135619172
#15 0x081c5753 in Ffuncall (nargs=3, args=0xbfffdd60) at eval.c:3038
        fun = 136678997
        original_fun = 139350282
        funcar = 0
        numargs = 2
        lisp_numargs = 140563389
        val = 139852222
        backtrace = {next = 0xbfffdfd0, function = 0xbfffdd60, args = 
0xbfffdd64, nargs = 2, evalargs = 0 '\000', debug_on_exit = 0 '\000'}
        internal_args = 0xbfffdca0
        i = 139319498
#16 0x08205e1a in Fbyte_code (bytestr=137646377, vector=137646397, maxdepth=40) 
at bytecode.c:680
        count = 15
        op = 2
        vectorp = 0x8345140
        bytestr_length = 345
        stack = {pc = 0x8371bc8 
"\034\311\312\313\"\035\311\312\314\"\036*\r\315=?\205%", top = 0xbfffdd68, 
bottom = 0xbfffdd60, byte_string = 137646377, 
          byte_string_start = 0x8371bb9 "\b\204\006", constants = 137646397, 
next = 0xbfffe1a0}
        top = 0xbfffdd60
        result = 139319498
#17 0x081c5df1 in funcall_lambda (fun=137646293, nargs=6, 
arg_vector=0xbfffe034) at eval.c:3211
        val = 139319498
        syms_left = 139319498
        next = 139689594
        count = 10
        i = 6
        optional = 1
        rest = 1
#18 0x081c58b5 in Ffuncall (nargs=7, args=0xbfffe030) at eval.c:3070
        fun = 137646293
        original_fun = 140125042
        funcar = 135954334
        numargs = 6
        lisp_numargs = 16
        val = 139319498
        backtrace = {next = 0xbfffe100, function = 0xbfffe030, args = 
0xbfffe034, nargs = 6, evalargs = 0 '\000', debug_on_exit = 0 '\000'}
        internal_args = 0x84dd8ca
        i = 6
#19 0x081c4e45 in Fapply (nargs=6, args=0xbfffe164) at eval.c:2503
        ret_ungc_val = 135984404
        i = 7
        numargs = 6
        spread_arg = 139319498
        funcall_args = 0xbfffe030
        fun = 137646293
        gcpro1 = {next = 0x81ca18a, var = 0x3, nvars = 7}
#20 0x081c55c4 in Ffuncall (nargs=7, args=0xbfffe160) at eval.c:3005
        fun = 138315245
        original_fun = 139428634
        funcar = 139587714
        numargs = 6
        lisp_numargs = 0
        val = 141834630
        backtrace = {next = 0xbfffe3c0, function = 0xbfffe160, args = 
0xbfffe164, nargs = 6, evalargs = 0 '\000', debug_on_exit = 0 '\000'}
        internal_args = 0x2
        i = -1073748956
#21 0x08205e1a in Fbyte_code (bytestr=137646153, vector=137646173, maxdepth=28) 
at bytecode.c:680
        count = 10
        op = 6
        vectorp = 0x8345060
        bytestr_length = 12
        stack = {pc = 0x8371d31 "\207", top = 0xbfffe178, bottom = 0xbfffe160, 
byte_string = 137646153, byte_string_start = 
    0x8371d26 "\304\305\b\t\306\307!\n\v&\006\207", constants = 137646173, next 
= 0xbfffe460}
        top = 0xbfffe160
        result = 139319498
#22 0x081c5df1 in funcall_lambda (fun=137646077, nargs=5, 
arg_vector=0xbfffe424) at eval.c:3211
        val = 139319498
        syms_left = 139319498
        next = 139689594
        count = 6
        i = 5
        optional = 1
        rest = 1
#23 0x081c58b5 in Ffuncall (nargs=6, args=0xbfffe420) at eval.c:3070
        fun = 137646077
        original_fun = 140125018
        funcar = 135982840
        numargs = 5
        lisp_numargs = 0
        val = 139319498
        backtrace = {next = 0xbfffe680, function = 0xbfffe420, args = 
0xbfffe424, nargs = 5, evalargs = 0 '\000', debug_on_exit = 0 '\000'}
        internal_args = 0x0
        i = -1073748252
#24 0x08205e1a in Fbyte_code (bytestr=137646873, vector=137646893, maxdepth=24) 
at bytecode.c:680
        count = 6
        op = 5
        vectorp = 0x8345330
        bytestr_length = 105
        stack = {pc = 
    0x8371b7a 
"\210\302\326\b\327\"\330\315\316\331%\210\302\326\b\332\"\333\"\210\302\326\b\334\"\335\315\316\336%\210\302\337\340\"\210\302\341\342\"\210\343\301!\031\344\345\346\211\347\350%\210\344\351\352\353\347\354%)\207",
 top = 0xbfffe434, bottom = 0xbfffe420, byte_string = 137646873, 
byte_string_start = 
    0x8371b4f 
"\302\303\304\"\210\302\305\306\"\210\302\307\310\"\210\302\311\312\"\210\302\313\314\315\316\317%\210\302\320\321\315\316\322%\210\302\323\324\315\316\325%\210\302\326\b\327\"\330\315\316\331%\210\302\326\b\332\"\333\"\210\302\326\b\334\"\335\315\316\336%\210\302\337\340\"\210\302\341\342\"\210\343\301!\031\344\345\346\211\347\350%\210\344\351\352\353\347\354%)\207",
 constants = 137646893, next = 0xbfffe710}
        top = 0xbfffe420
        result = 141895462
#25 0x081c5df1 in funcall_lambda (fun=137646853, nargs=0, 
arg_vector=0xbfffe6e4) at eval.c:3211
        val = 141895462
        syms_left = 139319498
        next = -1073748440
        count = 6
        i = 0
        optional = 0
        rest = 0
#26 0x081c58b5 in Ffuncall (nargs=1, args=0xbfffe6e0) at eval.c:3070
        fun = 137646853
        original_fun = 140091290
        funcar = 0
        numargs = 0
        lisp_numargs = 139319498
        val = 141834630
        backtrace = {next = 0xbfffe930, function = 0xbfffe6e0, args = 
0xbfffe6e4, nargs = 0, evalargs = 0 '\000', debug_on_exit = 0 '\000'}
        internal_args = 0x0
        i = -1073747564
#27 0x08205e1a in Fbyte_code (bytestr=137644633, vector=137644653, maxdepth=16) 
at bytecode.c:680
        count = 5
        op = 0
        vectorp = 0x8344a70
        bytestr_length = 128
        stack = {pc = 0x8371f48 "\210\202J", top = 0xbfffe6e0, bottom = 
0xbfffe6e0, byte_string = 137644633, byte_string_start = 
    0x8371f09 "\303 \030\t\304=\203\016", constants = 137644653, next = 
0xbfffe9d0}
        top = 0xbfffe6e0
        result = 141589224
#28 0x081c5df1 in funcall_lambda (fun=137644589, nargs=1, 
arg_vector=0xbfffe994) at eval.c:3211
        val = 139319498
        syms_left = 139319498
        next = 139735962
        count = 4
        i = 1
        optional = 1
        rest = 0
#29 0x081c58b5 in Ffuncall (nargs=2, args=0xbfffe990) at eval.c:3070
        fun = 137644589
        original_fun = 140091266
        funcar = 135982840
        numargs = 1
        lisp_numargs = 2
        val = 139319498
        backtrace = {next = 0xbfffebf0, function = 0xbfffe990, args = 
0xbfffe994, nargs = 1, evalargs = 0 '\000', debug_on_exit = 0 '\000'}
        internal_args = 0x0
        i = 112
#30 0x08205e1a in Fbyte_code (bytestr=136981529, vector=136981549, maxdepth=28) 
at bytecode.c:680
        count = 4
        op = 1
        vectorp = 0x82a2c30
        bytestr_length = 1665
        stack = {pc = 0x83c26a5 "\210\201\230", top = 0xbfffe994, bottom = 
0xbfffe990, byte_string = 136981529, byte_string_start = 
    0x83c23fb "\306 \020\307\021\n\023\307\024\310\311!\211\035\307=\204\064", 
constants = 136981549, next = 0xbfffec90}
        top = 0xbfffe990
        result = 139576473
#31 0x081c5df1 in funcall_lambda (fun=136981509, nargs=0, 
arg_vector=0xbfffec54) at eval.c:3211
        val = 139576473
        syms_left = 139319498
        next = 139571722
        count = 4
        i = 0
        optional = 0
        rest = 0
#32 0x081c58b5 in Ffuncall (nargs=1, args=0xbfffec50) at eval.c:3070
        fun = 136981509
        original_fun = 140134050
        funcar = 135982840
        numargs = 0
        lisp_numargs = 0
        val = 220
        backtrace = {next = 0xbfffef58, function = 0xbfffec50, args = 
0xbfffec54, nargs = 0, evalargs = 0 '\000', debug_on_exit = 0 '\000'}
        internal_args = 0x0
        i = 48
#33 0x08205e1a in Fbyte_code (bytestr=136978457, vector=136978477, maxdepth=24) 
at bytecode.c:680
        count = 2
        op = 0
        vectorp = 0x82a2030
        bytestr_length = 220
        stack = {pc = 0x83c31a7 
"\210*\340\341\342\"\210\343\321\344\"\211\036$;\203\251", top = 0xbfffec50, 
bottom = 0xbfffec50, byte_string = 136978457, 
          byte_string_start = 0x83c3119 "\b\203\b", constants = 136978477, next 
= 0x0}
        top = 0xbfffec50
        result = 29
#34 0x081c5df1 in funcall_lambda (fun=136978437, nargs=0, 
arg_vector=0xbfffee70) at eval.c:3211
        val = 4096
        syms_left = 139319498
        next = 30
        count = 2
        i = 0
        optional = 0
        rest = 0
#35 0x081c5aae in apply_lambda (fun=136978437, args=139319498, eval_flag=1) at 
eval.c:3135
        args_left = 139319498
        numargs = 0
        arg_vector = 0xbfffee70
        gcpro1 = {next = 0x0, var = 0x8719128, nvars = 0}
        gcpro2 = {next = 0xb8273c, var = 0xbfffef20, nvars = 10390076}
        gcpro3 = {next = 0xbfffef3c, var = 0x9d2d28, nvars = -1073746132}
        i = 0
        tem = -1073744432
#36 0x081c4a98 in Feval (form=139560030) at eval.c:2388
        fun = 136978437
        val = 0
        original_fun = 140244746
        original_args = 139319498
        funcar = 0
        backtrace = {next = 0x0, function = 0xbfffef70, args = 0xbfffee70, 
nargs = 0, evalargs = 0 '\000', debug_on_exit = 0 '\000'}
        gcpro1 = {next = 0x0, var = 0x0, nvars = 0}
        gcpro2 = {next = 0x9e34d8, var = 0x0, nvars = 0}
        gcpro3 = {next = 0x85dd628, var = 0x814c620, nvars = 0}
#37 0x0814387d in top_level_2 () at keyboard.c:1365
No locals.
#38 0x081c3388 in internal_condition_case (bfun=0x814386a <top_level_2>, 
handlers=139357474, hfun=0x81434d8 <cmd_error>) at eval.c:1490
        val = 0
        c = {tag = 139319498, val = 139319498, next = 0xbffff108, gcpro = 0x0, 
jmp = {{__jmpbuf = {-1073744432, -1073744572, -1073745164, -1073745720, 
-304938895, 
    711649054}, __mask_was_saved = 0, __saved_mask = {__val = {134538479, 
3086895784, 2, 10322301, 134536708, 3086912756, 10387396, 130431436, 27, 
3221221276, 
    10300233, 0, 429496729, 140367400, 500, 131928052, 130856801, 131935260, 
3221221172, 139242848, 139242976, 3221221812, 3221221672, 135654657, 2, 
3221221684, 
    3221221520, 0, 0, 0, 0, 0}}}}, backlist = 0x0, handlerlist = 0x0, 
lisp_eval_depth = 0, pdlcount = 2, poll_suppress_count = 1, 
interrupt_input_blocked = 0, 
          byte_stack = 0x0}
        h = {handler = 139357474, var = 139319498, chosen_clause = 130591995, 
tag = 0xbfffeff4, next = 0x0}
#39 0x081438b4 in top_level_1 () at keyboard.c:1373
No locals.
#40 0x081c2e6a in internal_catch (tag=139354546, func=0x814387f <top_level_1>, 
arg=139319498) at eval.c:1226
        c = {tag = 139354546, val = 139319498, next = 0x0, gcpro = 0x0, jmp = 
{{__jmpbuf = {-1073744432, -1073744572, -1073745164, -1073745448, -303218575, 
    709891870}, __mask_was_saved = 0, __saved_mask = {__val = {0, 0, 0, 0, 0, 
0, 0, 0, 0, 0, 130880286, 0, 0, 0, 130880286, 0, 0, 131933112, 0, 0, 139484843, 
    3221221848, 135984067, 139486890, 139484843, 139319498, 139345360, 
140955060, 136637276, 14, 22, 0}}}}, backlist = 0x0, handlerlist = 0x0, 
lisp_eval_depth = 0, 
          pdlcount = 2, poll_suppress_count = 1, interrupt_input_blocked = 0, 
byte_stack = 0x0}
#41 0x081437ed in command_loop () at keyboard.c:1328
No locals.
#42 0x081430f7 in recursive_edit_1 () at keyboard.c:950
        count = 1
        val = 134884005
#43 0x08143262 in Frecursive_edit () at keyboard.c:1012
        count = 0
        buffer = 139319498
#44 0x08141a62 in main (argc=3, argv=0xbffff674) at emacs.c:1784
        dummy = -1073744688
        stack_bottom_variable = 0 '\000'
        do_initial_setlocale = 1
        skip_args = 1
        rlim = {rlim_cur = 10485760, rlim_max = 18446744073709551615}
        no_loadup = 0
        junk = 0x0
        dname_arg = 0x0
(gdb)