[Bug 210409] zfs: panic during boot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210409

            Bug ID: 210409
           Summary: zfs: panic during boot
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: kp at freebsd.org

I’m running a root-on-ZFS system and reliably see this panic during boot.
It’s a 4 disk raidz-1, no log or cache devices.

Hardware is an HP Microserver.

Likely culprit (through bisect) is r300881.
It’s now running r302028 with r300881 backed out, and booting fine.

The panic:
panic: solaris assert: refcount(count(&spa->spa_refcount) >= spa->spa_minref ||
MUTEX_HELD(&spa_namespace_lock), file:
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c, line: 863

Unfortunately I can’t get a dump, but here’s a picture of the backtrace:
https://people.freebsd.org/~kp/zfs_panic.jpg

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