[Bug 256934] Panic in ena driver on a t3.large ec2 instance after upgrading to 13.0

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256934

--- Comment #3 from Alex Dupre <ale@FreeBSD.org> ---
(In reply to Artur Rojek from comment #2)

The machine had plenty of CPU credits when it happened, that possibility can be
discarded.

Until now, this was the only occurrence, but it happened after 15 days of
uptime and now only other 7 days passed. I have other machines that were
upgraded at the same time and didn't suffer the issue. But before upgrading to
13.0 they never suffered any kernel panic, FWIW.

What does the `debug.lock.delay_max` param do and what value should I try?
Currently I see it at 1024.

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