Dig: is anyone familiar with this unexpected output?

I was playing around with the dig command and received some unexpected output. Because I’m not familiar with it I thought I’d ask if anyone else has seen it before and can tell me to what it’s referring. Samples below:

add 0x55b5a8f2f8b8 size 32 file …/crypto/lhash/lhash.c line 109 mctx 0x55b5a8e6ca40
add 0x55b5a8f28778 size 40 file …/crypto/buffer/buffer.c line 35 mctx 0x55b5a8e6ca40
add 0x55b5a8eb2178 size 592 file …/crypto/err/err.c line 689 mctx 0x55b5a8e6ca40
add 0x55b5a8eb93f8 size 20 file …/crypto/init.c line 66 mctx 0x55b5a8e6ca40
add 0x7f72e1c17010 size 56 file …/…/…/lib/isc/heap.c line 88 mctx 0x55b5a8dcf140
add 0x7f72e1c18010 size 224 file …/…/…/…/lib/isc/unix/socket.c line 4632 mctx 0x55b5a8dcf140
add 0x7f72e1c12230 size 32 file …/…/…/lib/isc/log.c line 1068 mctx 0x55b5a8dcf140