[Bug corefiles/30273] New: Regression - "Core file format not supported"

["fthain@linux-m68k.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30273

            Bug ID: 30273
           Summary: Regression - "Core file format not supported"
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: corefiles
          Assignee: unassigned at sourceware dot org
          Reporter: fthain@linux-m68k.org
  Target Milestone: ---
              Host: m68k-linux-gnu
            Target: m68k-linux-gnu
             Build: m68k-linux-gnu

Created attachment 14780
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14780&action=edit
Sample core dump

I'm unable to open a core file with recent versions of gdb. The problem showed
up in Debian's gdb 13.1 build and I then reproduced the same failure in the
14.0.50.20230318 snapshot.

The core file itself (attached) appears to be fine as I was able to open it
with a previous gdb release (Gentoo vanilla 10.2).

I did a little investigation and found that
gdbarch->iterate_over_regset_sections == NULL for some reason. But that's as
far as I got. Please see,
https://lists.debian.org/debian-68k/2023/03/msg00012.html

# 
# /opt/gdb-14.0.50.20230318/bin/gdb --core core.0
GNU gdb (GDB) 14.0.50.20230318-git
Copyright (C) 2023 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 "m68k-unknown-linux-gnu".
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".
"/root/core.0": Core file format not supported
(gdb) 
(gdb) quit
# /opt/gdb-14.0.50.20230318/bin/gdb --configuration
This GDB was configured as follows:
   configure --host=m68k-unknown-linux-gnu --target=m68k-unknown-linux-gnu
             --with-auto-load-dir=$debugdir:$datadir/auto-load
             --with-auto-load-safe-path=$debugdir:$datadir/auto-load
             --with-expat
             --with-gdb-datadir=/opt/gdb-14.0.50.20230318/share/gdb
(relocatable)
             --with-jit-reader-dir=/opt/gdb-14.0.50.20230318/lib/gdb
(relocatable)
             --without-libunwind-ia64
             --with-lzma
             --with-babeltrace
             --without-intel-pt
             --with-xxhash
             --without-python
             --without-python-libdir
             --with-debuginfod
             --with-curses
             --without-guile
             --without-amd-dbgapi
             --disable-source-highlight
             --enable-threading
             --enable-tui
             --with-separate-debug-dir=/usr/lib/debug

("Relocatable" means the directory can be moved with the GDB installation
tree, and GDB will still find it.)


# gdb --core core.0
GNU gdb (Debian 13.1-2) 13.1
Copyright (C) 2023 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 "m68k-linux-gnu".
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".
"/root/core.0": Core file format not supported
(gdb) quit
# 
# gdb --configuration
This GDB was configured as follows:
   configure --host=m68k-linux-gnu --target=m68k-linux-gnu
             --with-auto-load-dir=$debugdir:$datadir/auto-load
             --with-auto-load-safe-path=$debugdir:$datadir/auto-load
             --with-expat
             --with-gdb-datadir=/usr/share/gdb (relocatable)
             --with-jit-reader-dir=/usr/lib/gdb (relocatable)
             --without-libunwind-ia64
             --with-lzma
             --with-babeltrace
             --without-intel-pt
             --with-mpfr
             --with-xxhash
             --with-python=/usr (relocatable)
             --with-python-libdir=/usr/lib (relocatable)
             --with-debuginfod
             --without-guile
             --enable-source-highlight
             --enable-threading
             --with-separate-debug-dir=/usr/lib/debug (relocatable)
             --with-system-gdbinit=/etc/gdb/gdbinit
             --with-system-gdbinit-dir=/etc/gdb/gdbinit.d

("Relocatable" means the directory can be moved with the GDB installation
tree, and GDB will still find it.)

# gcc --version
gcc (Debian 12.2.0-12) 12.2.0
Copyright (C) 2022 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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