Begin forwarded message:

From: "Jeff Squyres (jsquyres)" <[email protected]> To: Open MPI User's List <[email protected]> Date: December 19, 2014 at 8:05:19 AM CST Cc: "[email protected]" <[email protected]> Subject: Re: [petsc-maint] [OMPI users] Deadlock in OpenMPI 1.8.3 and PETSc 3.4.5

On Dec 19, 2014, at 8:58 AM, Jeff Squyres (jsquyres) <[email protected]> wrote:

...

More specifically, George's change can lead to inconsistency/incorrectness in the presence of multiple threads simultaneously executing attribute actions on a single entity.

Actually -- it's worse than I first thought. This change can lead to inconsistencies/incorrectness even with a single thread, if that thread adds or removes attributes on the same entity from which a callback is currently being invoked.

-- Jeff Squyres [email protected] For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/