crash in sg_alloc_table_chained

[Trapp, Darren]

Gents,

I am using 4.10rc4 kernel with the FC-NVME transport to format a partition on a remote nvme device.  I’ve created a partition on the device, but when I try and create a FS via:

Mkfs –t ext3 /dev/nvme0n1p1

I get a crash in sg_alloc_table_chained at the BUG_ON(!nents).  It is called from nvme_fc_map_data:
	        ret = sg_alloc_table_chained(&freq->sg_table, rq->nr_phys_segments,
                        freq->sg_table.sgl);

 In this case, rq->nr_phys_segments is 0.  For reference blk_rq_payload_bytes returned 0x10.

Any ideas what is going on?  


Darren