[Bug gdb/18216] New: displaced step+deliver signal, while another thread also needs to step over breakpoint, crashes gdb on hardware step targets

["palves at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18216

            Bug ID: 18216
           Summary: displaced step+deliver signal, while another thread
                    also needs to step over breakpoint, crashes gdb on
                    hardware step targets
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: palves at redhat dot com

gdb crashes on hardware step targets, if when we start resuming the target "in
proceed", there are multiple threads that needs to step over a breakpoint, and
we start a displaced set and deliver a signal at the same time (e.g.,
queue-signal), while _another_ thread also needs to step over breakpoint.

This is exact same use case that is mishandled on software single-step (see bug
18214) but it's like a funny mirror: on only happens with displaced stepping.

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