[Bug 193965] New: [zfs] zpool coredump on import

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193965

            Bug ID: 193965
           Summary: [zfs] zpool coredump on import
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: will at worrbase.com

I had a pool with 3 mirrors, a single floating disk in a RAID-0 and an SSD that
was both a cache and a log device. I got a new drive, and wanted to mirror the
single disk (bringing me up to four mirrors) and remove the SSD.

I booted normally and did a zpool remove tank gpt/log and zpool remove tank
gpt/cache. I powered off to install the hard disk. I booted with the new disk
attached and the SSD detached, and the machine kernel panicked. I removed the
disk and reattached the SSD as normal, and the machine panicked again. I
removed both the new disk and the SSD, and the machine still panicked.

I booted into mfsbsd (10, still). I did a zpool import -R /a tank (after a
mkdir /a, of course). This caused a coredump in zpool (see
https://imgur.com/25yAdon). The coredump is available here:
http://kefka.worrbase.com/zpool.core

Finally, I did a zpool import -F -n -R /a tank, and the pool imported
successfully.

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