groupmonitor.lua is sometimes faulty

[gjniewenhuijse]

i See a lot of drops.

* string: sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode ref pointer drops
88: 0100007F:EAD0 FFFFFF7F:1A40 01 00000000:00000000 00:00000000 00000000 0 0 492 2 cf9c6f00 0
111: 0100007F:03E7 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 500 2 cf9c7400 0
113: 00000000:14E9 00000000:0000 07 00000000:00000000 00:00000000 00000000 65534 0 1148 2 cf32ef00 2401
148: 0100007F:0B0C 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 836 2 cf9c7900 0
159: 0100007F:2717 00000000:0000 07 00000000:00000B00 00:00000000 00000000 0 0 914 2 cf9c6500 0
180: FFFFFF7F:1A2C 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 993 2 cf32e280 0
200: FFFFFF7F:1A40 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 65729512 2 cc8b6f00 0
200: FFFFFF7F:1A40 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 1020 2 cf32ea00 0
200: FFFFFF7F:1A40 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 1015 2 cf32ec80 663
200: FFFFFF7F:1A40 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 1006 2 cf32e780 0
200: FFFFFF7F:1A40 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 998 2 cf32e500 0
200: FFFFFF7F:1A40 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 960 2 cf32e000 0
200: FFFFFF7F:1A40 00000000:0000 07 00000000:00050180 00:00000000 00000000 0 0 938 2 cf9c6280 6853867
200: FFFFFF7F:1A40 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 837 2 cf9c7b80 0
200: FFFFFF7F:1A40 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 507 2 cf9c7680 0
200: FFFFFF7F:1A40 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 491 2 cf9c6c80 0
200: FFFFFF7F:1A40 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 485 2 cf9c6780 66
223: 00000000:0E57 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 494 2 cf9c7180 0
241: 0100007F:8B69 FFFFFF7F:04B0 01 00000000:00000000 00:00000000 00000000 0 0 486 2 cf9c6a00 0