Stack unwinding for green threads

[Christian Biesinger]

On Fri, Jul 3, 2020 at 4:51 AM Botond Dénes <bdenes@scylladb.com> wrote:
>
> Hi,
>
> I'm working on Scylla [1], an application which is built using the
> seastar framework [2]. This framework provides green threads [3] that
> have their own stacks. These threads are created with `setcontext()`
> and later we switch in/out using `setjmp()`/`longjmp()`.
>
> We have a collection of python scripts [4] to help debug Scylla, among
> these we have a utility command which allows switching in/out of these
> green threads in gdb. This command basically (tries) to emulate
> `setjmp()`/`longjmp()` in python, saving and restoring registers. There
> are several problems with this method. For starters it crashes gdb for
> some time now

It may be worth filing a bug for that at
https://sourceware.org/bugzilla/, crashing GDB sounds like a bug.

Christian