[Beowulf] RHEL7 kernel update for L1TF vulnerability breaks RDMA

Jörg Saßmannshausen sassy-work at sassy.formativ.net
Sat Aug 18 06:55:22 PDT 2018

Hi Chris,

unless there is something I miss but I read about that in 'Der Spiegel Online' 
on Wednesday 


and the link was to this page here:


So I don't really understand about "Cannot make this public, as the patch that 
caused it was due to embargo'd security fix." issue. The problem is known and I 
also noticed that Debian issued some Intel microcode patches which raised my 
awareness about a potential problem again.

Sorry, maybe I miss out something here.

All the best


Am Samstag, 18. August 2018, 21:56:52 BST schrieb Chris Samuel:
> On 18/8/18 8:47 pm, Jörg Saßmannshausen wrote:
> > Hi Chris,
> Hiya,
> > these are bad news if InfiniBand will be affected here as well as
> > that is what we need to use for parallel calculations. They make use
> > of RMDA and if that has a problem..... well, you get the idea I
> > guess.
> Oh yes, this is why I wanted to bring it to everyones attention, this
> isn't just about Lustre, it's much more widespread.
> > Has anybody contacted the vendors like Mellanox or Intel regarding
> > this?
> As Kilian wrote in the Lustre bug quoting his RHEL bug:
>      https://bugzilla.redhat.com/show_bug.cgi?id=1618452
>      — Comment #3 from Don Dutile <ddutile at redhat.com> —
>      Already reported and being actively fixed.
>      Cannot make this public, as the patch that caused it was due to
> embargo'd
>      security fix.
>      This issue has highest priority for resolution.
>      Revert to 3.10.0-862.11.5.el7 in the mean time.
>      This bug has been marked as a duplicate of bug 1616346

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