[Bug 248050] Keeps handle to loaded kernel module twice?

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248050

            Bug ID: 248050
           Summary: Keeps handle to loaded kernel module twice?
           Product: Base System
           Version: 12.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: dmilith at me.com

Basically:

kldstat | grep -c dtrace # returns "0", no kernel modules loaded yet
kldload dtrace # ok
kldload dtraceall # ok
kldstat | grep -c dtrace # returns "2" - two matching kernel modules loaded -
all ok.


And here's the issue:

kldunload dtrace # ok - shouldn't be ok. dtrace module is still loaded at this
point but command returns 0 - success
kldstat | grep -c dtrace # returns "2" again.

kldunload dtrace # causes (expected) fail:

kldunload: can't unload file: Device busy

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