[Bug gdb/26876] gdb error: internal-error: Unknown CFA rule when debugging the linux kernel with qemu

["vincent at bernat dot im" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26876

Vincent Bernat <vincent at bernat dot im> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vincent at bernat dot im

--- Comment #15 from Vincent Bernat <vincent at bernat dot im> ---
I am running into the same bug with 10.2. I am running gdb from Nix:

```
gdb$  show version
GNU gdb (GDB) 10.2
Copyright (C) 2021 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 "x86_64-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".
gdb$  show configuration
This GDB was configured as follows:
   configure --host=x86_64-unknown-linux-gnu --target=x86_64-unknown-linux-gnu
             --with-auto-load-dir=$debugdir:$datadir/auto-load
            
--with-auto-load-safe-path=$debugdir:$datadir/auto-load:/nix/store/0kiykyrnrpfhmjwxwx89kxr20hmf5304-gcc-10.3.0-lib
             --with-expat
            
--with-gdb-datadir=/nix/store/wx014fbhv8ssxbn076skz4rwn55qcgpd-gdb-10.2/share/gdb
(relocatable)
            
--with-jit-reader-dir=/nix/store/wx014fbhv8ssxbn076skz4rwn55qcgpd-gdb-10.2/lib/gdb
(relocatable)
             --without-libunwind-ia64
             --without-lzma
             --without-babeltrace
             --with-intel-pt
             --with-mpfr
             --without-xxhash
            
--with-python=/nix/store/nki9ywqzbvz68vr75kn2r7g1q84f5agy-python3-3.9.6
            
--with-python-libdir=/nix/store/nki9ywqzbvz68vr75kn2r7g1q84f5agy-python3-3.9.6/lib
             --without-debuginfod
             --without-guile
             --disable-source-highlight
            
--with-separate-debug-dir=/nix/store/wx014fbhv8ssxbn076skz4rwn55qcgpd-gdb-10.2/lib/debug
(relocatable)

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

And I am running QEMU 6.1:

```
 22:46 ❱ qemu-system-x86_64 --version
QEMU emulator version 6.1.0 (Debian 1:6.1+dfsg-1)
Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers
```

Also when running `lx-symbols`:

```
gdb$  lx-symbols
loading vmlinux
../../gdb/dwarf2/frame.c:1085: internal-error: Unknown CFA rule.
A problem internal to GDB has been detected,
```

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