[Bug 198228] zfs loader failed to load kernel from degraded mirror (disk with SMART errors)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198228

            Bug ID: 198228
           Summary: zfs loader failed to load kernel from degraded mirror
                    (disk with SMART errors)
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: bz at FreeBSD.org

After a power glitch one of the zfsroot machines in the lab did not come up
anymore.

The machine in questions had
1 SSD with freebsd-boot on it + l2arc cache
2 HDD in a ZFS mirror setup.

The first of the two HDDs (according to BIOS sort order at least), had SMART
event errors (as notified by BIOS upon boot).

While loading the loader still worked fine, loading the kernel was not possible
anymore and the twiddle went very slowly on the text segment.  We aborted after
about 8 hours.

Removing the disk with SMART error notification and the system booted back up
just fine with a degraded mirror.


Further diagnosis is no longer possible as the machine in question was needed
and the disk is going to RMA.  However ZFS loader should be able to deal with
this situation (better).  Someone with enough loader + zfs knowledge could go
and have a look and either report read errors (checksum mismatches, ...) or if
detecting a mirror trying the other source instead or providing a possibly to
more easily select which source to use (abort, print message, let user set the
variable and retry).


PS: There is also the point that ^c does not work during the time we are trying
to load entities so breaking into the loader shell was not possible, which is
somewhat unhelpful.

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