[petsc-dev] potential bug with MPI_Win_fence() in openmpi-1.8.4

[Jeff Squyres (jsquyres)]

Oops -- that was a mistake from George when he committed the fix, and I just propagated that mistake into the v1.8 pull request.  I'll fix it there, at least.  But the master commit message is unfortunately going to have to stay wrong.  :-(


> On Apr 30, 2015, at 2:59 PM, Matthew Knepley <knepley at gmail.com> wrote:
> 
> On Fri, May 1, 2015 at 4:55 AM, Jeff Squyres (jsquyres) <jsquyres at cisco.com> wrote:
> Thank you!
> 
> George reviewed your patch and adjusted it a bit.  We applied it to master and it's pending to the release series (v1.8.x).
> 
> Was this identified by IBM?
> 
>   https://github.com/open-mpi/ompi/commit/015d3f56cf749ee5ad9ea4428d2f5da72f9bbe08
> 
>      Matt
>  
> Would you mind testing a nightly master snapshot?  It should be in tonight's build:
> 
>     http://www.open-mpi.org/nightly/master/
> 
> 
> 
> > On Apr 30, 2015, at 12:50 AM, Satish Balay <balay at mcs.anl.gov> wrote:
> >
> > OpenMPI developers,
> >
> > We've had issues (memory errors) with OpenMPI - and code in PETSc
> > library that uses MPI_Win_fence().
> >
> > Vagrind shows memory corruption deep inside OpenMPI function stack.
> >
> > I'm attaching a potential patch that appears to fix this issue for us.
> > [the corresponding valgrind trace is listed in the patch header]
> >
> > Perhaps there is a more appropriate fix for this memory corruption. Could
> > you check on this?
> >
> > [Sorry I don't have a pure MPI test code to demonstrate this error -
> > but a PETSc test example code consistantly reproduces this issue]
> >
> > Thanks,
> > Satish<openmpi-1.8.4.patch>
> 
> 
> --
> Jeff Squyres
> jsquyres at cisco.com
> For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
> 
> 
> 
> 
> -- 
> What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
> -- Norbert Wiener


-- 
Jeff Squyres
jsquyres at cisco.com
For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/