In version 1.89, I saw in dmesg.2 after I lost contact with this NFS filesystem:

> xfs_force_shutdown(lvm(58,2),0x8) called from line 1070 of file xfs_trans.c. Re
> turn address = 0xc025674b
> Filesystem "lvm(58,2)": Corruption of in-memory data detected. Shutting down fi
> lesystem: lvm(58,2)
> Please umount the filesystem, and rectify the problem(s)

Restarting the system cleared up the problem, but is there any other way to prevent this? I suspect, but am not sure, that this may have happened again, and so repeats on the timescale of ~50 days.