> DDB reveals hundreds (thousands?) of rpcbind processes in fstchg
> state (whatever that is),

Based on looking at the source, this means they're waiting on the
fstrans_state_cv condition variable:

kern/vfs_trans.c:       cv_init(&fstrans_state_cv, "fstchg");

That's the only occurrence of fstchg I find anywhere under (10.1's)
/usr/src/sys.

man 9 fstrans on a 10.1 machine I have a guest login on indicates that
fstrans is a subsystem which "assists file system suspension and
copy-on-write snapshots".

Further deponent sayeth not.  I'd have to start digging through code in
ways I don't now have time to in order to say more.

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