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Fix 3-way deadlock that can happen because of ZFS and vnode lock
order reversal. thread0 (vfs_fhtovp) thread1 (vop_getattr) thread2 (zfs_recv) -------------------- --------------------- ------------------ vn_lock rrw_enter_read rrw_enter_write (hangs) rrw_enter_read (hangs) vn_lock (hangs) Submitted by: Attila Nagy <bra@fsn.hu> MFC after: 3 days
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