[Bug 283312] Kernel crash in sched_switch

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283312

--- Comment #2 from Alexey Vyskubov <alexey@ocaml.nl> ---
I did not notice anything in common between crashes. What was running at this
time was portmaster and a number of iocage jails (they are running
continuously) with Angie, Nginx, and Lighttpd. There was also a Bhyve VM with
15-CURRENT (also running continuously). All in all the system was not very
loaded. Two network interfaces (internal and external) but no routing. No IPv6.
OpenVPN (only FIB 1 goes through it). Tailscale. PF. *Maybe* the crashes
appeared when portmaster was running (portmaster -God), but I am not sure at
all.

It may be related to memory that the system is running on ZFS (it always was).
Also, just in case it has 64 Gb of swap on the SSD, it is normally empty. I
would be looking for problems earlier, if any noticeable part of it was taken.

❯ freecolor -om
             total       used       free     shared    buffers     cached
Mem:         63567      52477      11089          0          0          0
Swap:        65536          0      65536

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