[v3.2.24] ct: endless loop when initializing netfilter/ct cache

[Holger Eitzenberger]

Hi Thomas,

> That makes sense. Insertion through pickup became exponetionally
> more expensive.
> 
> The right thing to do here is to introduce a flag to disable the
> dup check for individual caches and even cache types such as CT
> which do not require the dup check at all.

Yes, the insert is O(n^2) since introducing dup check.  With
thousands of conntracks it is currently unusable.

If you want I can cook an RFC path for that.

 /Holger