From owner-freebsd-current@freebsd.org  Wed Feb  5 09:12:07 2020
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From: =?UTF-8?Q?Stefan_E=c3=9fer?= <se@freebsd.org>
Subject: Panic in gptzfsboot?
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Date: Wed, 5 Feb 2020 10:12:04 +0100
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I have just re-built world and kernel and get a boot failure:

panic: free: guard2 fail @ 0x412f6c50 + 513 from unknown:0
--> Press a key in the console to reboot <--

I'll try to boot from a memory stick, now, but wanted to let
others know, that there seems to be a problem with the latest
UMA code which may cause a boot failure at this early stage.

STefan