[Bug 224944] ZFS boot on Raspberry Pi 2 broken between 11.0 and 11.1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224944

            Bug ID: 224944
           Summary: ZFS boot on Raspberry Pi 2 broken between 11.0 and
                    11.1
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: cyr.k at me.com

Have been using root ZFS on my Raspberry Pi 2 with FreeBSD 11.0 for quite some
time (standard Raspberry MSDOS loader partition, then a small UFS containing
only kernel /boot, then everything else in a ZFS pool, over GELI if that's
somehow important).

After trying to update the kernel to 11.1 the system panics during its boot
process with the message:
"thread 0x.... terminating with rrw lock 0x.... held"

Just using the same SD card and rewriting /boot with the files from 11.0 fixes
this.

All the kernel/system binaries are taken straight from the
FreeBSD-11.0(/11.1)-RELEASE-arm-armv6-RPI2.img.xz images from the official FTP,
extracted to manually gpart'ed / formatted disks of course.

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