[Beowulf] RHEL7 kernel update for L1TF vulnerability breaks RDMA
engwalljonathanthereal at gmail.com
Sun Aug 19 13:32:26 PDT 2018
I am not shocked that my previous message may have been removed. There is a bit of brute science involved as well. A false burst may seem to tune a network. A properly timed burst is more effective in gaining authorization. You don't need magic code to leverage a network you just need to generate request that is swifter to answer than drop.
Your own configurations can be to blame. Suppose you require a percentage of answered to blocked requests. You open that door.
Suppose you want a specific set up time, whatever it is the shorter the better. When those connections go underutilized you may have a smoking gun.
Any fans of NPTEL? A lecture I watched today was quite synchronised.
Earlier I should have written so NOT do this...
You would also be looking for many many symlinks for users who exploit the network itself, I am on!y trying to help and don't know for a fact or do any of these sorts of things.
On August 18, 2018, at 4:57 AM, Chris Samuel <chris at csamuel.org> wrote:
On 18/8/18 8:47 pm, Jörg Saßmannshausen wrote:
> Hi Chris,
> 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
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
As Kilian wrote in the Lustre bug quoting his RHEL bug:
— 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
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
Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC
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