I updated my main amd64 workstation to r332158 from something much
earlier (mid Jan).

Upon reboot, all seemed well.  However, I later realized that the vmm.ko
module was not loaded at boot, because bhyve PCI passthru did not
work.  My loader.conf looks like (I'm passing a USB interface through):


# Tune ZFS Arc Size - Change to adjust memory used for disk cache

The problem seems "random".  I rebooted into single-user to
see if somehow, vmm.ko was loaded at boot and something
was unloading vmm.ko.  However, on this boot it was loaded.  I then
^D'ed and continued to multi-user, where X failed to start because
this time, the nvidia modules were not loaded.  (but nvidia had
been loaded on the 1st boot).

So it *seems* like different modules are randomly not loaded by the
loader, at boot.   The ZFS config is:


        NAME        STATE     READ WRITE CKSUM
        tank        ONLINE       0     0     0
          mirror-0  ONLINE       0     0     0
            ada0p2  ONLINE       0     0     0
            da3p2   ONLINE       0     0     0
          mirror-1  ONLINE       0     0     0
            ada1p2  ONLINE       0     0     0
            da0p2   ONLINE       0     0     0
          da2s1d    ONLINE       0     0     0

The data drives in the pool are all exactly like this:

=>        34  9767541101  ada0  GPT  (4.5T)
          34           6        - free -  (3.0K)
          40      204800     1  efi  (100M)
      204840  9763209216     2  freebsd-zfs  (4.5T)
  9763414056     4096000     3  freebsd-swap  (2.0G)
  9767510056       31079        - free -  (15M)

There is about 1.44T used in the pool.  I have no idea
how ZFS mirrors work, but I'm wondering if somehow this
is a 2T problem, and there are issues with blocks on
difference sides of the mirror being across the 2T boundary.

Sorry to be so vague.. but this is the one machine I *don't* have
a serial console on, so I don't have good logs.


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