The git commit hash is 6f7e916a6c80df11bf169587913fb0443f6b5490
(I'm replying this email by the phone, not convenient to view the git log
date for this hash.

On Sun, Feb 2, 2025, 14:52 Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Eval EXEC <execvy@gmail.com>
> > Date: Sun, 02 Feb 2025 12:57:20 +0800
> >
> > (gdb) source /home/exec/Projects/
> git.savannah.gnu.org/git/emacs/src/.gdbinit
> > warning: /home/exec/Projects/
> git.savannah.gnu.org/git/emacs-build/../lwlib: No such file or directory
> > 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 = tmux-256color
> > Breakpoint 1 at 0x5b5f92: file /home/exec/Projects/
> git.savannah.gnu.org/git/emacs/src/emacs.c, line 432.
> > Breakpoint 2 at 0x583d75: file /home/exec/Projects/
> git.savannah.gnu.org/git/emacs/src/xterm.c, line 27122.
> > (gdb) bt full
> > #0  XCAR (c=XIL(0x7f6c4a7bc7f3)) at /home/exec/Projects/
> git.savannah.gnu.org/git/emacs/src/lisp.h:1562
> > No locals.
> > #1  Fdelq (elt=XIL(0x7f6c358427fb), list=XIL(0x7f6c35842813)) at
> /home/exec/Projects/git.savannah.gnu.org/git/emacs/src/fns.c:2103
> >         tem = <optimized out>
> >         li = {
> >           tortoise = XIL(0x7f6c4a7bc7f3),
> >           max = 8,
> >           n = 0,
> >           q = 8
> >         }
> >         prev = XIL(0x7f6c35871db3)
> >         tail = XIL(0x7f6c4a7bc7f3)
> > #2  0x0000000000695af7 in remove_process (proc=XIL(0x7f6c2a3ef8ed)) at
> /home/exec/Projects/git.savannah.gnu.org/git/emacs/src/process.c:962
> >         pair = <optimized out>
> > #3  0x00000000006a19ca in status_notify
> (deleting_process=0x7f6c2a3ef8e8, wait_proc=0x0) at /home/exec/Projects/
> git.savannah.gnu.org/git/emacs/src/process.c:7881
> >         symbol = <optimized out>
> >         p = 0x7f6c2a3ef8e8
> >         proc = XIL(0x7f6c2a3ef8ed)
> >         tail = XIL(0x7f6c2a2de583)
> >         msg = XIL(0x7f6c34d11854)
> >         got_some_output = -1
> > #4  0x0000000000698fb7 in Fdelete_process (process=XIL(0x7f6c2a3ef8ed))
> at /home/exec/Projects/git.savannah.gnu.org/git/emacs/src/process.c:1128
> >         p = 0x7f6c2a3ef8e8
> >         mess = false
> > #5  0x00000000006a690c in kill_buffer_processes (buffer=XIL(0)) at
> /home/exec/Projects/git.savannah.gnu.org/git/emacs/src/process.c:8418
> >         tail = XIL(0x7f6c2a2de583)
> >         proc = <optimized out>
> > #6  0x00000000005b48ec in shut_down_emacs (sig=sig@entry=11,
> stuff=stuff@entry=XIL(0)) at /home/exec/Projects/
> git.savannah.gnu.org/git/emacs/src/emacs.c:3148
> >         tpgrp = <optimized out>
> >         fmt = "Fatal error %d: "
> > #7  0x00000000005b6027 in terminate_due_to_signal (sig=11,
> backtrace_limit=40) at /home/exec/Projects/
> git.savannah.gnu.org/git/emacs/src/emacs.c:453
> > No locals.
> > #8  0x00000000005da311 in handle_fatal_signal (sig=sig@entry=11) at
> /home/exec/Projects/git.savannah.gnu.org/git/emacs/src/sysdep.c:1799
> > No locals.
> > #9  0x00000000005d6194 in deliver_thread_signal (handler=0x5da303
> <handle_fatal_signal>, sig=11) at /home/exec/Projects/
> git.savannah.gnu.org/git/emacs/src/sysdep.c:1791
> >         old_errno = <optimized out>
> > #10 deliver_fatal_thread_signal (sig=sig@entry=11) at
> /home/exec/Projects/git.savannah.gnu.org/git/emacs/src/sysdep.c:1811
> > No locals.
> > #11 0x00000000005d61c3 in handle_sigsegv (sig=11, siginfo=<optimized
> out>, arg=<optimized out>) at /home/exec/Projects/
> git.savannah.gnu.org/git/emacs/src/sysdep.c:1949
> >         fatal = <optimized out>
> > #12 <signal handler called>
> > No symbol table info available.
> > #13 0x00007f6cc3cde86b in kill () from
> /nix/store/nqb2ns2d1lahnd5ncwmn6k84qfd7vx2k-glibc-2.40-36/lib/libc.so.6
> > No symbol table info available.
> > #14 0x00000000007928f9 in sigHandle ()
> > No symbol table info available.
> > #15 <signal handler called>
> > No symbol table info available.
> > #16 0x0000000000628fa0 in indirect_function (object=XIL(0)) at
> /home/exec/Projects/git.savannah.gnu.org/git/emacs/src/data.c:2563
> > No locals.
>
> Very strange, this SIGSEGV:
>
>   indirect_function (Lisp_Object object)
>   {
>     while (SYMBOLP (object) && !NILP (object))
>       object = XSYMBOL (object)->u.s.function;
>     return object;
>   }
>
> If indirect_function is called with nil, it should just return nil.
> Why does it segfault?
>
> What happens next is that we shut down Emacs, and something happens
> when we are deleting a process object:
>
> > #0  XCAR (c=XIL(0x7f6c4a7bc7f3)) at /home/exec/Projects/
> git.savannah.gnu.org/git/emacs/src/lisp.h:1562
> > No locals.
> > #1  Fdelq (elt=XIL(0x7f6c358427fb), list=XIL(0x7f6c35842813)) at
> /home/exec/Projects/git.savannah.gnu.org/git/emacs/src/fns.c:2103
> >         tem = <optimized out>
> >         li = {
> >           tortoise = XIL(0x7f6c4a7bc7f3),
> >           max = 8,
> >           n = 0,
> >           q = 8
> >         }
> >         prev = XIL(0x7f6c35871db3)
> >         tail = XIL(0x7f6c4a7bc7f3)
> > #2  0x0000000000695af7 in remove_process (proc=XIL(0x7f6c2a3ef8ed)) at
> /home/exec/Projects/git.savannah.gnu.org/git/emacs/src/process.c:962
> >         pair = <optimized out>
> > #3  0x00000000006a19ca in status_notify
> (deleting_process=0x7f6c2a3ef8e8, wait_proc=0x0) at /home/exec/Projects/
> git.savannah.gnu.org/git/emacs/src/process.c:7881
>
> Why did it stop inside XCAR?  And I don't see MPS involved anywhere,
> so this could be some problem unrelated to the igc branch.
>
> Maybe someone else has an idea how to debug this further.
>
> Btw, your sources seem to be outdated.  When did you sync with the Git
> repository?
>