On Wed, Apr 06, 2016 at 05:53:07PM -0400, Tejun Heo wrote:

Can you list applications which make use of CLONE_VM without
CLONE_THREAD? 

I ran into one two years ago or so; I forgot what it was, but it made
perf misbehave because we too had assumed this not to happen.

Eventually it turned out a newer version of that software did no longer
do this and we more or less left it at that.

But it does show that crap is out there..