[Bug 252553] Kernel panic on big network and IO load

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252553

            Bug ID: 252553
           Summary: Kernel panic on big network and IO load
           Product: Base System
           Version: 12.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: dmilith at me.com

Hello.

I struggle with very annoying KP one of my dedicated servers.

Long story short - it's i7 8 cores, 64GiBs RAM machine with ELK server
(Elasticsearch 5.6 + Kibana 5.6 + Logstash 5.6), which gathers application logs
from our 350+ external hosts

Let's say - it's under heavy network and IO load. I'm also using ZFS on root
with sync=disabled on datasets (this way after a panic we lose only some part
of logs and whole ES index doesn't get corrupted).
System has 64G swap on ZFS enabled, but it never gets really filled.

Every 5-6 hours, (sometimes 5-6 days…) kernel just panics there.
Yesterday I build new, fresh 12.2 kernel with NETDUMP feature enabled, and did
setup of netdumpd on our second dedicated machine.

In effect, I woke up and have some information from minidump with some info
what's causing the panic (hopefully):

https://gist.github.com/dmilith/9606ebf422ae1770b42d9e23f1116c7b

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