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bug#52141: 29.0.50; Crash during redisplay
From: |
Andreas Schwab |
Subject: |
bug#52141: 29.0.50; Crash during redisplay |
Date: |
Sat, 27 Nov 2021 13:01:00 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) |
On Nov 27 2021, Eli Zaretskii wrote:
>> From: Po Lu <luangruo@yahoo.com>
>> Cc: 52141@debbugs.gnu.org
>> Date: Sat, 27 Nov 2021 19:32:29 +0800
>>
>> >> #9 set_next_vectorPython Exception <class 'gdb.MemoryError'>: Cannot
>> >> access memory at address 0xfe94cc8
>> >> (p=#10 setup_on_free_list (nbytes=<optimized out>, v=0x2ce6c10) at
>> >> alloc.c:2977
>> >> #11 sweep_vectors () at alloc.c:3242
>> >> #12 0x0000000000561328 in gc_sweep () at alloc.c:7255
>> >> #13 garbage_collect () at alloc.c:6190
>> >> #14 0x0000000000561811 in maybe_garbage_collect () at alloc.c:6053
>> >> #15 0x00000000005804ad in maybe_gc () at
>> >> /home/oldosfan/emacs-dev/emacs-gc/src/lisp.h:5161
>> >> #16 eval_sub (form=0x1e753d3) at eval.c:2449
>> >> #17 0x0000000000582149 in Feval (form=0x1e753d3, lexical=<optimized out>)
>> >> at eval.c:2372
>> > ^^^^
>> > What is this form we are evaluating here? Can you show its contents?
>> > (Not that I think it is related to the crash.)
>>
>> Its type is Lisp_Cons. However, its address is invalid. Running
>> `xcons' in gdb complains:
>>
>> (gdb) xcons
>> $9 = (struct Lisp_Cons *) 0x1e753d0
>> Cannot access memory at address 0x1e753d0
>
> Hmm... and the address is very different from the one which caused the
> segfault. Strange.
There could have been several corruptions that only surfaced just now.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
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