[Beowulf] Fwd: RHEL7 kernel update for L1TF vulnerability breaks RDMA

Michael Di Domenico mdidomenico4 at gmail.com
Tue Sep 11 04:49:53 PDT 2018

meant to send this to the list not just ryan

---------- Forwarded message ---------
From: Michael Di Domenico <mdidomenico4 at gmail.com>
Date: Tue, Sep 11, 2018 at 7:48 AM
Subject: Re: [Beowulf] RHEL7 kernel update for L1TF vulnerability breaks RDMA
To: <novosirj at rutgers.edu>

On Mon, Sep 10, 2018 at 7:18 PM Ryan Novosielski <novosirj at rutgers.edu> wrote:
> > On Sep 10, 2018, at 18:15, Chris Samuel <chris at csamuel.org> wrote:
> >
> >> So I guess I have to forgive the software engineer who fat-fingered that
> >> semicolon. Of course I've done worse.
> >
> > Oh yes, same here too!   There but for... and all that. :-)
> So we’ve learned what, here, that RedHat doesn’t test the RDMA stack at all?

i'm not sure the test path was that simple.  I updated my machines to
the rhel 11.6 kernel.  i was able to use IPoIB but was not able to use
Lustre.  so while the ultimate fix was a semi-colon, the failure code
path i believe is/was more complicated.

what this tells me is that there's probably more bugs in the IB stack
then anyone thinks

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