[Bug 235856] FreeBSD freezes on AWS EC2 t3 machines

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235856

--- Comment #51 from Colin Percival <cperciva at FreeBSD.org> ---
(In reply to mail from comment #50)

Hi Ruben,

Thanks!  This is consistent with my current understanding, which is that the
patch I provided fixes the data structure corruption issues (which showed up as
some of the more "interesting" warnings and also sometimes as kernel panics).

The timeouts and freezing appear to be due to the ENA driver having trouble
allocating jumbo mbuf clusters during low-memory conditions.  Can you check
"sysctl -a | grep mjum_alloc_fail" (ideally, log it every minute and see if it
jumps around the times you see hanging)?

I have a patch which I believe fixes this which I'd be happy to share if you
want to try something experimental -- we're still discussing details about the
best way to address this, though.

Colin

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