[Beowulf] RHEL7 kernel update for L1TF vulnerability breaks RDMA

Jörg Saßmannshausen sassy-work at sassy.formativ.net
Fri Aug 17 13:22:08 PDT 2018

Hi all,

I came across the 'foreshadow' problem 2 days ago. 

This is what I got back from my colleagues:


This is more a performance investigation though but I thought I might add a 
bit more information to the whole problem.

All the best


Am Freitag, 17. August 2018, 07:54:03 BST schrieb Kilian Cavalotti:
> Hi Chris,
> On Thu, Aug 16, 2018 at 10:05 PM, Chris Samuel <chris at csamuel.org> wrote:
> > There's 6 CVE's addressed in that update from the look of it, so it might
> > not be the L1TF fix itself that has triggered it.
> > 
> > https://access.redhat.com/errata/RHSA-2018:2384
> That's true: RH mentioned an "embargo'd security fix" but didn't refer
> to L1TF explicitly (which I think is not under embargo anymore).
> As the reporter of the issue on the Whamcloud JIRA, I also have to
> apologize for initially pointing fingers at Lustre, it didn't cross my
> mind that this kind of whole RDMA stack breakage would have slipped
> past Red Hat's QA.
> Cheers,

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