[Beowulf] RHEL7 kernel update for L1TF vulnerability breaks RDMA

Chris Samuel chris at csamuel.org
Mon Sep 10 15:15:16 PDT 2018

On Tuesday, 11 September 2018 1:25:55 AM AEST Peter St. John wrote:

> I had wanted to say that such a bug would be caught by compiling with some
> reasonalbe warning level; but I think I was wrong.

Interesting - looks like it depends on your GCC version, 7.3.0 catches it with -Wall here:

chris at quad:/tmp$ gcc -Wall test.c -o test
test.c: In function ‘main’:
test.c:6:2: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation]
  if ( test );
test.c:7:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘if’
   printf ( "hello\n" );

> 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. :-)

All the best,
 Chris Samuel  :  http://www.csamuel.org/  :  Melbourne, VIC

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