[Bug threads/20743] can't usefully "continue" due to "ptrace: No such process" after gdb switches thread (gdb7.11.1 on FreeBSD 11)

["jhb at FreeBSD dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20743

jhb at FreeBSD dot org changed:

           What    |Removed                     |Added
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                 CC|                            |jhb at FreeBSD dot org

--- Comment #2 from jhb at FreeBSD dot org ---
I can confirm this, and I have a similar patch (but using is_exited(), and
patching both of the callbacks, but asserting that we never try to do a
single-resume of an exited thread).

The reason gdb switches to new threads when they are created is that we always
report a stop when a new thread arrives.  I could change this to have it only
add the thread but not report a stop, but it gets kind of messy if you are
single-stepping across thread creation as in theory I would need to cache that
info down in the fbsd nat layer and PT_SUSPEND the new thread before doing my
own PT_CONTINUE.

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