[Bug 295805] KGDB 15.1 seems broken for PPC64

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295805

            Bug ID: 295805
           Summary: KGDB 15.1 seems broken for PPC64
           Product: Ports & Packages
           Version: Latest
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: volkovdablo@hotmail.com
                CC: powerpc@FreeBSD.org
                CC: powerpc@FreeBSD.org

KGDB (GDB 15.1) built from ports seems to be broken, preventing tools like
crashinfo to operate appropiately.

Using normal GDB 15.1  (with a simple program compiled with GCC), seems to work
properly:

gdb Test
GNU gdb (GDB) 15.1 [GDB v15.1 for FreeBSD]
Copyright (C) 2024 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "powerpc64-portbld-freebsd15.1".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from Test...
(gdb) b main.c:9
Breakpoint 1 at 0x10000654: file main.c, line 9.
(gdb) r
Starting program: /tmp/Test

Breakpoint 1, main () at main.c:9
9                       printf("Hello from here!\n");
(gdb) n
Hello from here!
7               for(int i = 0; i < 16; ++i)
(gdb)

Breakpoint 1, main () at main.c:9
9                       printf("Hello from here!\n");
(gdb) p i
$1 = 1

However, when I call kgdb I get:
$ kgdb
GNU gdb (GDB) 15.1 [GDB v15.1 for FreeBSD]
Copyright (C) 2024 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "powerpc64-portbld-freebsd15.1".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /boot/kernel/kernel...
Reading symbols from /usr/lib/debug//boot/kernel/kernel.debug...


Fatal signal: Segmentation fault
----- Backtrace -----
0x107f9ac7 ???
0x10965097 ???
0x10965f1f ???
0x813113863 handle_signal
        /usr/src/lib/libthr/thread/thr_sig.c:317
0x813112a93 thr_sighandler
        /usr/src/lib/libthr/thread/thr_sig.c:261
---------------------
A fatal error internal to GDB has been detected, further
debugging is not possible.  GDB will now terminate.

This is a bug, please report it.  For instructions, see:
<https://www.gnu.org/software/gdb/bugs/>.

Segmentation fault (core dumped)

When opening some crash info I get a similar output:

bm-fbsd-ppc64-javi dumped core - see /var/crash/vmcore.5

Wed Jun  3 11:48:57 JST 2026

FreeBSD bm-fbsd-ppc64-javi 15.1-RC1 FreeBSD 15.1-RC1
releng/15.1-n283533-2bf6b6559810 GENERIC  powerpc

panic: instruction storage interrupt trap

Reading symbols from /boot/kernel/kernel...
Reading symbols from /usr/lib/debug//boot/kernel/kernel.debug...


Fatal signal: Segmentation fault
----- Backtrace -----
0x107f9ac7 ???
0x10965097 ???
0x10965f1f ???
0x813113863 handle_signal
        /usr/src/lib/libthr/thread/thr_sig.c:317
0x813112a93 thr_sighandler
        /usr/src/lib/libthr/thread/thr_sig.c:261
---------------------
A fatal error internal to GDB has been detected, further
debugging is not possible.  GDB will now terminate.

This is a bug, please report it.  For instructions, see:
<https://www.gnu.org/software/gdb/bugs/>.

Segmentation fault (core dumped)


------------------------------------------------------------------------
ps -axlww

ps: invalid corefile

------------------------------------------------------------------------
...

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