[Bug 206509] Separate /var partition on UEFI

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206509

            Bug ID: 206509
           Summary: Separate /var partition on UEFI
           Product: Base System
           Version: 10.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: eu9gu4 at gmail.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Installed 10.2 on a SSD in a UEFI machine. Booting nice, everything was OK
until I made a separate partition that I was intending for /var.

gpart add -a 4k -s 8G -t freebsd-ufs -l bsdvar ada4

After this step I rebooted and everything was still OK. Then I did

newfs -U -j -L bsdvar ada4p4

After this step FreeBSD does not boot:

FreeBSD EFI boot block
loader path: /boot/loader.efi
File /boot/loader.efi not found
panic: load failed

If I boot now into my Linux system and delete the newly created BSD partition,
FreeBSD boots fine again.

My drives setup is this (after creating the separate FreeBSD partition):

ada4 - 1TB HDD connected to 1st SATA port, sda1 in Linux
ada5 - 420GB SSD connected to 2nd SATA port, sda2 in Linux

ada4p1 - 16GB EFI system partition (boots all my other systems)
ada4p2 - 96GB Gentoo Linux alternate system
ada4p3 - 500GB transfer partition
ada4p4 - 8GB new created FreeBSD partition intended for /var

ada5p1 - 192GB Windows 10 partition
ada5p2 - 1GB Windows diag partition
ada5p3 - 1GB Microsoft Reserved Partition
ada5p4 - 96 GB Gentoo Linux main system
ada5p5 - 800kB EFI system partition created by FreeBSD install
ada5p6 - 64GB FreeBSD UFS partition

There are a few other hard drives in the system, fully occupied with zfs and
btrfs data file systems that are not touched by FreeBSD.

Before getting the SSD, I used to have a FreeBSD 10.2 system installed on ada4
(1st SATA disk), with separate partitions for /var, /usr/src and /usr/ports,
working just fine.

I'd really like to have my FreeBSD system up and running again, so any help
will be very appreciated.

Eugen

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