bug#54458: 27.2; erc-dcc-get: Re-entering top level after C stack overflow

[Fernando de Morais <fernandodemorais.jf@gmail.com>]

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Eli Zaretskii <eliz@gnu.org> writes:

> It would help if you could reproduce the problem again, this time when
> running Emacs under GDB to begin with.  When Emacs segfaults, please
> do
>
>   (gdb) source /path/to/emacs/src/.gdbinit
>   (gdb) xbacktrace
>
> (replace /path/to/emacs/src with the directory where you have the
> Emacs source tree).  The last command will show the Lisp interpreter
> nacktrace, which will make it easier to understand where the recursion
> happens in Lisp.

Right!

I don't know if something is missing here in my build, but when I
reproduced the problem and source the .gdbinit file, as well as calling
`xbacktrace', only one line appeared as output, as can be seen in the
attached log:

    Cannot access memory at address 0x7fffff66ff4

Just in case, I saved the complete GDB log, from `run' to `xbacktrace'.

Hope it helps.

-- 
Regards,
Fernando de Morais.


[-- Attachment #2: GDB output log. --]
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Starting program: /home/fernando/Documentos/Projetos/emacs-27/src/emacs 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7ffff18a2640 (LWP 43727)]
[New Thread 0x7ffff0e58640 (LWP 43728)]
[New Thread 0x7fffeb454640 (LWP 43729)]
[New Thread 0x7fffea78f640 (LWP 43805)]
[New Thread 0x7fffe9f8e640 (LWP 43813)]
[Thread 0x7fffe9f8e640 (LWP 43813) exited]
[New Thread 0x7fffe9f8e640 (LWP 43820)]
[New Thread 0x7fffe978d640 (LWP 43823)]
[Thread 0x7fffe9f8e640 (LWP 43820) exited]
[Thread 0x7fffe978d640 (LWP 43823) exited]
[Detaching after vfork from child process 43835]
[Detaching after vfork from child process 43837]
[Detaching after vfork from child process 43838]
[Detaching after vfork from child process 43839]
[Detaching after vfork from child process 43840]
[Detaching after vfork from child process 43841]
[Detaching after vfork from child process 43842]
[Detaching after vfork from child process 43843]
[Detaching after vfork from child process 43845]
[Detaching after vfork from child process 43846]
[Detaching after vfork from child process 43847]
[Detaching after vfork from child process 43910]
[Detaching after vfork from child process 43911]
[Detaching after vfork from child process 43912]
[Detaching after vfork from child process 43914]
[Detaching after vfork from child process 43917]
[Detaching after vfork from child process 43919]
[Detaching after vfork from child process 43920]
[Detaching after vfork from child process 43921]
[Detaching after vfork from child process 43923]
[Detaching after vfork from child process 43924]
[Detaching after vfork from child process 43926]
[Detaching after vfork from child process 43927]
[New Thread 0x7fffe8e15f40 (LWP 43930)]
[Thread 0x7fffe8e15f40 (LWP 43930) exited]

Thread 1 "emacs" received signal SIGSEGV, Segmentation fault.
0x00005555559e9536 in exec_byte_code (bytestr=..., vector=..., maxdepth=..., args_template=..., nargs=0, args=0x0) at bytecode.c:372
372	  *top = vector; /* Ensure VECTOR survives GC (Bug#33014).  */
Warning: /home/fernando/Documentos/../lwlib: Arquivo ou diretório inexistente.
SIGINT is used by the debugger.
Are you sure you want to change it? (y or n) [answered Y; input not from terminal]
DISPLAY = :0
TERM = xterm-kitty
Breakpoint 1 at 0x5555557db1f9: file emacs.c, line 379.
Breakpoint 2 at 0x555555768a43: file xterm.c, line 10145.
Cannot access memory at address 0x7fffff66ff4f
quit