markj
3579270d7e
Avoid dropping the topology lock in gmirror's dumpconf implementation. ...
Doing so introduces races which can lead to a use-after-free when
grabbing a snapshot of the GEOM mesh.
To ensure that a mirror's disk list remains stable, change its locking
protocol: both the softc lock and the topology lock are now required
to modify the list, so either lock is sufficient for traversal.
Tested by: pho
MFC after: 2 weeks
Sponsored by: Dell EMC Isilon
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3579270d7e