On 06/11/2014 03:46 PM, Eric W. Biederman wrote:
> ip netns add also performs a bind mount so we get into all of the vfs
> level locking as well.

It's actually quite a bit worse than that as ip netns exec creates a new
mount namespace as well.  That being said, the vfs issues have been
healthily mitigated by a number of recent patches by Al Viro to
fs/namespace.c.

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