[Bug 249258] OpenZFS kstat.zfs.misc.dbufs extremely large

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249258

            Bug ID: 249258
           Summary: OpenZFS kstat.zfs.misc.dbufs extremely large
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: ltning-freebsd at anduin.net

Anything depending on the output of 'sysctl -a' or 'sysctl
kstat.zfs.misc.dbufs' will effectively hang 'forever' on my system, and
reportedly others too. The system in question is running a poudriere jail,
which builds a few hundred packages every night.

System is a 8-core 256GB system; resource congestion is not an issue.

E.g. Puppet will be useless on this system, since 'sysctl -a' is run during
fact collection.

Suggestion: Do not gather/output kstat.zfs.misc.dbufs unless specifically
requested.

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