[Bug gdb/29941] Inferior call strlen(p) gives segfaults in GDB 13, (somewhat?) works in GDB11 and GDB12

["mark at klomp dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29941

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mark at klomp dot org

--- Comment #1 from Mark Wielaard <mark at klomp dot org> ---
The same crashes for me with gdb build from current git source on arm64.

It crashes here:

Thread 1 "gdb" received signal SIGSEGV, Segmentation fault.
0x00000055558457b8 in get_frame_arch (this_frame=...) at
/home/mark/src/binutils-gdb/gdb/frame.c:2890
2890      return frame_unwind_arch (frame_info_ptr (this_frame->next));

Turns out this_frame->next == NULL:

(gdb) print this_frame
$1 = {<intrusive_list_node<frame_info_ptr>> = {next = 0x0, prev =
0x7fffffe8d8}, m_ptr = 0x0, 
  m_cached_id = {stack_addr = 0, code_addr = 0, special_addr = 0, stack_status
= FID_STACK_INVALID, 
    code_addr_p = 0, special_addr_p = 0, artificial_depth = 0}, static
frame_list = {
    m_front = 0x5556025c00 <selected_frame>, m_back = 0x7fffffe438}}

But the first thing frame_unwind_arch does is dereference its argument:

(gdb) list
2885    /* Architecture methods.  */
2886    
2887    struct gdbarch *
2888    get_frame_arch (frame_info_ptr this_frame)
2889    {
2890      return frame_unwind_arch (frame_info_ptr (this_frame->next));
2891    }
2892    
2893    struct gdbarch *
2894    frame_unwind_arch (frame_info_ptr next_frame)
2895    {
2896      if (!next_frame->prev_arch.p)
2897        {

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