Release RLock before calling MaybeAdd to avoid deadlock
Release RLock before calling MaybeAdd to avoid deadlock

Fixes #3694

vivekmenezes/cockroach,vivekmenezes/cockroach,glycerine/cockroach,petermattis/cockroach,nieyy/cockroach,maxlang/cockroach,marcuswestin/cockroach,vaibhavarora/cockroach,sunya123/cockroach,il9ue/cockroach,nieyy/cockroach,sunya123/cockroach,bg451/cockroach,cockroachdb/cockroach,cuongdo/cockroach,maxlang/cockroach,vaibhavarora/cockroach,arjun4084346/cockroach,arjun4084346/cockroach,vaibhavarora/cockroach,marcuswestin/cockroach,petermattis/cockroach,veteranlu/cockroach,maxlang/cockroach,paperstreet/cockroach,paperstreet/cockroach,marcuswestin/cockroach,vivekmenezes/cockroach,glycerine/cockroach,sunya123/cockroach,bg451/cockroach,nieyy/cockroach,maxlang/cockroach,nieyy/cockroach,il9ue/cockroach,marcuswestin/cockroach,cockroachdb/cockroach,arjun4084346/cockroach,vaibhavarora/cockroach,maxlang/cockroach,maxlang/cockroach,bg451/cockroach,petermattis/cockroach,cuongdo/cockroach,cockroachdb/cockroach,cuongdo/cockroach,il9ue/cockroach,vivekmenezes/cockroach,cockroachdb/cockroach,vivekmenezes/cockroach,marcuswestin/cockroach,cuongdo/cockroach,sunya123/cockroach,vaibhavarora/cockroach,cockroachdb/cockroach,sunya123/cockroach,marcuswestin/cockroach,cuongdo/cockroach,cockroachdb/cockroach,bg451/cockroach,paperstreet/cockroach,paperstreet/cockroach,marcuswestin/cockroach,arjun4084346/cockroach,petermattis/cockroach,paperstreet/cockroach,cockroachdb/cockroach,arjun4084346/cockroach,nieyy/cockroach,veteranlu/cockroach,sunya123/cockroach,glycerine/cockroach,veteranlu/cockroach,veteranlu/cockroach,bg451/cockroach,cuongdo/cockroach,glycerine/cockroach,glycerine/cockroach,glycerine/cockroach,petermattis/cockroach,cuongdo/cockroach,sunya123/cockroach,nieyy/cockroach,arjun4084346/cockroach,vaibhavarora/cockroach,maxlang/cockroach,maxlang/cockroach,bg451/cockroach,arjun4084346/cockroach,paperstreet/cockroach,il9ue/cockroach,bg451/cockroach,glycerine/cockroach,veteranlu/cockroach,veteranlu/cockroach,il9ue/cockroach,petermattis/cockroach,vivekmenezes/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,cockroachdb/cockroach,vivekmenezes/cockroach,nieyy/cockroach,veteranlu/cockroach,nieyy/cockroach,paperstreet/cockroach,petermattis/cockroach,il9ue/cockroach,cuongdo/cockroach,petermattis/cockroach,sunya123/cockroach,glycerine/cockroach,vaibhavarora/cockroach,veteranlu/cockroach,marcuswestin/cockroach,vaibhavarora/cockroach,il9ue/cockroach,il9ue/cockroach,paperstreet/cockroach