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From: "palves at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug gdb/26754] Race condition when resuming threads and one does an
 exec
Date: Thu, 19 Nov 2020 23:52:58 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26754

--- Comment #8 from Pedro Alves <palves at redhat dot com> ---
>> I would prefer to preserve gdb thread id =3D=3D 1 before / after exec,
>> but that's a GDB concern, not a kernel interface concern.
> I don't understand what you mean here.

If we delete the zombie leader in reaction to PTRACE_EVENT_EXEC_BEGIN, then
when we get the PTRACE_EVENT_EXEC, we'll create a new thread for the new
leader, and that will end up with a GDB tid !=3D 1.

   1.1     main ()
 * 1.2     thread()

and after exec we have:

 * 1.3     main ()

I'm thinking that it would be better to end up with:

 * 1.1     main ()

Similar to how if a non-threaded program execs, the main thread's thread nu=
mber
doesn't change.

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