Messages in this thread | | | From | Linus Torvalds <> | Date | Sat, 11 Apr 2020 13:07:48 -0700 | Subject | Re: [GIT PULL] Please pull proc and exec work for 5.7-rc1 |
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On Sat, Apr 11, 2020 at 12:15 PM Bernd Edlinger <bernd.edlinger@hotmail.de> wrote: > > But won't the dead thread's lifetime overlap the new thread's lifetime > from the tracer's POV?
What new thread?
execve() doesn't create any new thread.
But yes, an external tracer could see the (old) thread that did execve() do new system calls before it sees the (other old) thread that was a zombie.
But that is already somethign that can happen, simply because the events aren't ordered. The whole issue is that the zombie thread already died, but the tracer just didn't bother to read that state change.
So it's not that the dead thread somehow _dies_ after the execve(). It already died.
It's just that whoever is to reap it (or traces it) just hasn't cared to read the status of that thing yet.
Linus
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