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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug threads/28065] FAIL:
 gdb.threads/access-mem-running-thread-exit.exp: all-stop: access mem (print
 global_var after writing again, inf=1, iter=354)
Date: Fri, 09 Jul 2021 18:57:08 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28065

--- Comment #16 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Pedro Alves from comment #14)
> This is brilliant work, Tom.  Thanks for doing all this.
>=20

Np :)

> In the standalong reproducer, you're missing a close(fd) at the end of
> get_global_var, but even with that it reproduces for me too.
>=20

Ack, thanks.

> It looks like a kernel bug to me off hand, are you thinking otherwise?

I'm not sure. I made the standalone reproducer to show to the kernel people
such that they can answer that question ;)

I read your comment about mem_rw, and looked at the code, and that seems to
make sense, but ... not my expertise, so I easily could be overlooking
something.

FWIW, I found in https://man7.org/linux/man-pages/man5/proc.5.html :
...
       /proc/[pid]/task (since Linux 2.6.0)
       ...
              In a multithreaded process, the contents of the
              /proc/[pid]/task directory are not available if the main
              thread has already terminated (typically by calling
              pthread_exit(3)).
...

So, I guess it's possible we get the "unsupported" answer.

--=20
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