9fce266679
MNT_VNODE_FOREACH_ALL() is supposed to avoid returning doomed vnodes, but the VI_DOOMED check it used was done without the vnode interlock held, so it could race with a concurrent vgone(). Submitted by: Don Morris <don.morris@isilon.com> Reviewed by: kib, mckusick MFC after: 1 week Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D12704
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