[Bug build/31281] [gdb] intrusive_list.h:329: internal-error: push_back: Assertion elem_node->prev == INTRUSIVE_LIST_UNLINKED_VALUE failed.

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31281

--- Comment #15 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #11)
> (In reply to Simon Marchi from comment #9)
> > The D.191606 bit adds an offset of 8 (this becomes apparent at the expand
> > rtl dump file).  That also happens to be the offset of the inherited
> > intrusive list node, see:
> > ...
> > class thread_info : public refcounted_object,
> >                     public intrusive_list_node<thread_info>
> > ...
> > and:
> > ...
> > (gdb) p (void *) &thread.next - (void *) thread
> > $13 = 8
> > ...
> 
> And following that logic, by flipping the order here:
> ...
> diff --git a/gdb/gdbthread.h b/gdb/gdbthread.h
> index e7035d40ad4..3167bf31945 100644
> --- a/gdb/gdbthread.h
> +++ b/gdb/gdbthread.h
> @@ -246,8 +246,8 @@ using private_thread_info_up =
> std::unique_ptr<private_thread_info>;
>  
>     The intrusive_list_node base links threads in a per-inferior list.  */
>  
> -class thread_info : public refcounted_object,
> -                   public intrusive_list_node<thread_info>
> +class thread_info : public intrusive_list_node<thread_info>,
> +                   public refcounted_object
>  {
>  public:
>    explicit thread_info (inferior *inf, ptid_t ptid);
> ...
> we change the offset from 8 to 0, and ... the test-case passes.

Posted this as workaround:
https://sourceware.org/pipermail/gdb-patches/2024-January/206218.html

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