I can add that we've received report about identical panic on FreeBSD releng/12.2 of r365436, AKA TrueNAS 12.0-RC1: https://jira.ixsystems.com/browse/NAS-107578 . So it looks a) pretty rate (one report from thousands of early adopters and none in our lab), and b) it is in stable/12 too, not only head. -- Alexander Motin