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0e1f616
(Get the code!)
That is sadly not an option. LTS-backport kernel has a spectacular and easy to repeat Oops when namespaces are used. See #843892.
It is not guaranteed by the kernel (it certainly wasn't in 2.6.32) that namespaces would be created and deleted instantly and without undue system pressure. It seems to me that the bug is in applications which think this can be done. As an example, in 2.6.32 creating 1000 interfaces and deleting them takes a huge time on delete due to RCU sync issues. If a userspace program did this, prompted by an external user, our response would not be to disable creation and deletion of interfaces. Rather we'd fix the userspace program not to do it.