[Bug gdb/21221] gdb hangs while stepping an empty loop

["luis.machado at arm dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21221

--- Comment #21 from Luis Machado <luis.machado at arm dot com> ---
Thanks for the input. That behavior sounds like a different bug in gdb. When in
motion, gdb should always be interruptible so that you don't run into
situations like this.

There isn't much gdb can do about the tight loops themselves, but there should
be a graceful way out of it with the interruption.

In the past there used to be a race condition between gdb sending the interrupt
request and the remote replying with a stop reply, and then gdb for some reason
used to disregard the interrupt request and proceed with the motion (issuing
stepi/continue over and over again).

I'll have to play with this a bit more to see if I can reproduce the same
situation.

Unrelated, but I did notice the black magic debugging stub is still using ACK
packets though. If it isn't dealing with unreliable communication channels,
that can be dropped.

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