[Bug 227631] panic: vputx: usecount not zero for vnode

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227631

Edward Tomasz Napierala <trasz at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |trasz at FreeBSD.org

--- Comment #6 from Edward Tomasz Napierala <trasz at FreeBSD.org> ---
The crash seems to be triggered by ctladm(8) trying to remove a LUN, and
looking at core.0, it seems there are several ctladm instances running.  Is it
possible that two instances are trying to manipulate the same LUN?  If so, this
might be what triggers the problem.  There might be unsufficient locking in the
CTL block backend.

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