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I am in a bit of a problem reporting mood today, so here's another report.

I was upgrading a system like I usually do, using ZFS boot environments.
First, I activated a new BE with bectl activate -t.
The I rebooted and to my surprise the boot was to the bootfs BE, not to the 
temporary activated one.
Also, bectl list showed that the new BE still had the temporary activation.

It was as if loader.efi completely ignored presence of the next-boot 
configuration.  The configuration was neither honored nor cleared.

I examined the serial console log for any potential clues but couldn't find 
anything unusual except for one message:
   ZFS: i/o error - all block copies unavailable
   ZFS: can't read MOS of pool tank

But tank is *not* the boot/root pool, it's purely a data pool.
Still, I wonder if that error could have unintended consequences for next-boot.

Here is a bigger log snippet, just in case:
Consoles: EFI console
ZFS: i/o error - all block copies unavailable
ZFS: can't read MOS of pool tank
     Reading loader env vars from /efi/freebsd/loader.env
Setting currdev to disk0p1:
FreeBSD/amd64 EFI loader, Revision 3.0

    Command line arguments: loader.efi
    Image base: 0x7f0e1000
    EFI version: 2.40
    EFI Firmware: American Megatrends (rev 5.11)
    Console: efi (0x20000000)
    Load Path: \EFI\FREEBSD\LOADER.EFI
    Load Device: 
PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)/SAS(0x4433221104000000,0x0,0x1,SATA,External,Direct,0,0x0)/HD(1,GPT,1783F6B9-13FF-11EE-89E9-002590DCD8F9,0x28,0x82000)
    BootCurrent: 0000
    BootOrder: 0000[*] 0001 0005 0004 0003 0002
    BootInfo Path: 
HD(1,GPT,1783F6B9-13FF-11EE-89E9-002590DCD8F9,0x28,0x82000)/\EFI\FREEBSD\LOADER.EFI
Ignoring Boot0000: Only one DP found
Trying ESP: 
PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)/SAS(0x4433221104000000,0x0,0x1,SATA,External,Direct,0,0x0)/HD(1,GPT,1783F6B9-13FF-11EE-89E9-002590DCD8F9,0x28,0x82000)
Setting currdev to disk0p1:
Trying: 
PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)/SAS(0x4433221104000000,0x0,0x1,SATA,External,Direct,0,0x0)/HD(2,GPT,2418C833-13FF-11EE-89E9-002590DCD8F9,0x82028,0x800)
Setting currdev to disk0p2:
Trying: 
PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)/SAS(0x4433221104000000,0x0,0x1,SATA,External,Direct,0,0x0)/HD(3,GPT,31227754-13FF-11EE-89E9-002590DCD8F9,0x82828,0x1000000)
Setting currdev to disk0p3:
Trying: 
PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)/SAS(0x4433221104000000,0x0,0x1,SATA,External,Direct,0,0x0)/HD(4,GPT,357485B5-13FF-11EE-89E9-002590DCD8F9,0x1082828,0x1C143120)
Setting currdev to zfs:zroot/ROOT/default:
Loading /boot/defaults/loader.conf
Loading /boot/defaults/loader.conf
Loading /boot/device.hints
Loading /boot/loader.conf
Loading /boot/loader.conf.local

-- 
Andriy Gapon