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bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs
From: |
Michael Welsh Duggan |
Subject: |
bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs |
Date: |
Mon, 29 Mar 2021 10:06:43 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Eli Zaretskii <eliz@gnu.org> writes:
>> From: Michael Welsh Duggan <mwd@md5i.com>
>> Cc: Michael Welsh Duggan <mwd@cert.org>, Eli Zaretskii <eliz@gnu.org>,
>> "mwd@md5i.com" <mwd@md5i.com>, "schwab@linux-m68k.org"
>> <schwab@linux-m68k.org>, "47244@debbugs.gnu.org" <47244@debbugs.gnu.org>
>> Date: Wed, 24 Mar 2021 22:19:35 -0400
>>
>> > --- a/src/buffer.c
>> > +++ b/src/buffer.c
>> > @@ -2151,6 +2151,9 @@ set_buffer_internal_1 (register struct buffer *b)
>> >
>> > BUFFER_CHECK_INDIRECTION (b);
>> >
>> > + if (!BUFFER_LIVE_P (b))
>> > + error ("Selecting deleted buffer");
>> > +
>> > old_buf = current_buffer;
>> > current_buffer = b;
>> > last_known_column_point = -1; /* Invalidate indentation cache. */
>>
>> Okay. Building now and will run until...something happens? Should I be
>> expecting an Emacs error from this?
>
> Yes.
>
>> Should I breakpoint the error() clause?
>
> Better put a breakpoint on this call to 'error' instead, because
> 'error' could be called for unrelated reasons, and it could be caught
> -- you don't want those cases.
I have now hit this breakpoint. Backtrace included. xbacktrace was
empty. I'll leave the gdb session up for forensics.
#0 set_buffer_internal_2 (b=0x5555578f43d8) at ../../master/src/buffer.c:2155
old_buf = 0x555555593480 <_start>
tail = XIL(0)
#1 0x0000555555713f28 in set_buffer_internal_1 (b=0x1)
at ../../master/src/buffer.c:2141
#2 0x00005555556e4ec6 in set_buffer_internal (b=0x5555578f43d8)
at ../../master/src/buffer.h:1184
#3 0x00005555556e6b21 in command_loop_1 () at ../../master/src/keyboard.c:1289
cmd = XIL(0x7fffffffde10)
keybuf =
{XIL(0), XIL(0x7ffff2c27c1d), XIL(0x555555765cd4), XIL(0x11cf6b0),
XIL(0x7fffffffdd70), XIL(0x55555579e20b), XIL(0x11cf6b0), XIL(0x7ffff257e4c4),
XIL(0x555559de7123), XIL(0x7ffff2c27c1d), XIL(0x7ffff2c27c1d),
XIL(0x555559de7123), XIL(0x7ffff257e4c4), XIL(0x11cf6b0), XIL(0), XIL(0),
XIL(0x555555cc5f80), XIL(0), XIL(0), XIL(0x7fffffffdd70), XIL(0x5555556e3c73),
XIL(0xffffddc0), XIL(0x555555cc5f80), XIL(0), XIL(0), XIL(0x7fffffffdda0),
XIL(0x555555797d03), make_fixnum(0), XIL(0x7fffffffdde0), XIL(0x55555579b3f4)}
i = 1
prev_modiff = 0
prev_buffer = 0x0
already_adjusted = false
#4 0x000055555579afef in internal_condition_case
(bfun=0x5555556e690c <command_loop_1>, handlers=XIL(0x90),
hfun=0x5555556e60a8 <cmd_error>) at ../../master/src/eval.c:1439
val = XIL(0x5555556e3c73)
c = 0x555555dc13e0
#5 0x00005555556e65d4 in command_loop_2 (ignore=XIL(0))
at ../../master/src/keyboard.c:1094
val = make_fixnum(0)
#6 0x000055555579a7fd in internal_catch
(tag=XIL(0xd9e0), func=0x5555556e65a7 <command_loop_2>, arg=XIL(0))
at ../../master/src/eval.c:1189
val = XIL(0xd9e0)
c = 0x555555daa710
#7 0x00005555556e6573 in command_loop () at ../../master/src/keyboard.c:1073
#8 0x00005555556e5c79 in recursive_edit_1 ()
at ../../master/src/keyboard.c:720
count = 1
val = XIL(0x7fffffffdf50)
#9 0x00005555556e5dfc in Frecursive_edit () at ../../master/src/keyboard.c:789
count = 0
buffer = XIL(0)
#10 0x00005555556e2829 in main (argc=2, argv=0x7fffffffe1b8)
at ../../master/src/emacs.c:2050
stack_bottom_variable = 0x7ffff617e053
no_loadup = false
junk = 0x0
dname_arg = 0x0
ch_to_dir = 0x0
original_pwd = 0x0
dump_mode = 0x0
skip_args = 1
temacs = 0x0
attempt_load_pdump = true
rlim = {
rlim_cur = 10022912,
rlim_max = 18446744073709551615
}
lc_all = 0x0
sockfd = -1
module_assertions = false
--
Michael Welsh Duggan
(mwd@cert.org)
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, (continued)
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, martin rudalics, 2021/03/23
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/03/23
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Eli Zaretskii, 2021/03/23
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, martin rudalics, 2021/03/24
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/03/24
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, martin rudalics, 2021/03/24
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/03/24
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Eli Zaretskii, 2021/03/25
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs,
Michael Welsh Duggan <=
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Eli Zaretskii, 2021/03/29
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/03/29
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Eli Zaretskii, 2021/03/29
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Eli Zaretskii, 2021/03/29
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Eli Zaretskii, 2021/03/29
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, martin rudalics, 2021/03/29
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/03/29
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, martin rudalics, 2021/03/29
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/03/29
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, martin rudalics, 2021/03/30