cam_periph_mapmem: attempt to map 2779097930 bytes, which is greater than 65536

I've just upgraded to 11-CURRENT and noticed a couple of new 
cam_periph_mapmem warnings in the dmesg output:

Trying to mount root from zfs:zroot []...
WARNING: attempt to domain_add(netgraph) after domainfinalize()
cam_periph_mapmem: attempt to map 2779097930 bytes, which is greater 
than 65536
cam_periph_mapmem: attempt to map 2779097930 bytes, which is greater 
than 65536

If it's relevant, the disks I have installed are:

ses0 at ahciem0 bus 0 scbus6 target 0 lun 0
ses0: <AHCI SGPIO Enclosure 1.00 0001> SEMB S-E-S 2.00 device
ses0: SEMB SES Device
ada0 at ahcich0 bus 0 scbus0 target 0 lun 0
ada0: <ST750LX003-1AC154 SM12> ATA-8 SATA 3.x device
ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada0: Command Queueing enabled
ada0: 715404MB (1465149168 512 byte sectors: 16H 63S/T 16383C)
ada0: Previously was known as ad4
ada1 at ahcich1 bus 0 scbus1 target 0 lun 0
ada1: <ST31000340NS MA0D> ATA-8 SATA 2.x device
ada1: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada1: Command Queueing enabled
ada1: 953869MB (1953525168 512 byte sectors: 16H 63S/T 16383C)
ada1: Previously was known as ad6
ada2 at ahcich2 bus 0 scbus2 target 0 lun 0
ada2: <ST31000340NS MA08> ATA-8 SATA 2.x device
ada2: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada2: Command Queueing enabled
ada2: 953869MB (1953525168 512 byte sectors: 16H 63S/T 16383C)
ada2: Previously was known as ad8
ada3 at ahcich4 bus 0 scbus4 target 0 lun 0
ada3: <ST31000340NS MA0D> ATA-8 SATA 2.x device
ada3: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada3: Command Queueing enabled
ada3: 953869MB (1953525168 512 byte sectors: 16H 63S/T 16383C)
ada3: Previously was known as ad12

-- 
Bruce Cran