[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 #3 from Konstantin Belousov <kib at FreeBSD.org> ---
Generally if you using PT_LWPINFO, you should use it after each reported stop.
I am not sure, in your test, which stop occurs when the thread is created,
it could be earlier than you call to PT_LWPINFO.

And then, since you use pid and not tid for ptrace(), it is relatively
random which thread new dbregs are applied.

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