Cowboy issue with kernel 5.16

I have a strange (low level) issue with Cowboy since I upgraded to kernel 5.16.

I am cross posting here because it could be an important one, and I think it deserves some more visibility.

To summarize, phoenix app does not serve static file anymore with kernel 5.16, and I traced it back to cowboy.


After investigations it seems to be caused by ZFS. Some regression with kernel 5.16. So if you have this combo, do not update to 5.16 yet.