[Bug 250954] ptrace(): weird ordering between inheriting debug registers and reporting a new thread

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250954

--- Comment #11 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to Michał Górny from comment #10)
And again I do not understand what you are complaining about.

We stop target before new thread returns to userspace.  This is the moment
where
TDB_BORN or TBD_SCX are checked.  So if you are tracing either syscall exits
or forks you get stop with SIGTRAP and pl_flag PL_FLAG_BORN.  More, I believe
that pl_lwpid is set to the lwpid of the new thread.

At that stop, you can set whatever registers in the newborn thread.

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