[Bug gdb/27830] Attempt to resume already running thread

["andrew.burgess at embecosm dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27830

--- Comment #3 from Andrew Burgess <andrew.burgess at embecosm dot com> ---
Created attachment 13432
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13432&action=edit
testsuite patch

Of course, once I realised that what we have is a thread that manages to be
running when it shouldn't be, then it's easy enough to get GDB to trigger an
assertion like this:

  internal-error: int finish_step_over(execution_control_state*): Assertion
`ecs->event_thread->control.trap_expected' failed.

What's happening here is the new thread, the thread that GDB isn't expecting to
be running, is hitting a stop event.  The thread then ends up inside
finish_step_over, where we make some assertions about the state of the thread
that we expect to stop.  As the thread that actually stops is not the one we
expect, things go wrong and we hit the assertion.

The attached patch adds a new testcase that exposes this issue (on
x86-64/Linux).

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