#FreeBSD upgrade from 11 to 12 weekend-destroying gotcha: If your zfs-root geli passphrase has runs of uppercase letters, you can't use the caps lock key anymore because it counts as a keystroke now, & your system won't boot past the new kernel.
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One of the #FreeBSD maintainers replied on birdsite to my upgrade woes a few weeks ago, and I forgot to remark here what became of it: This is apparently a regression, and I have a bug open on it. https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240760
