[BP MB-45400 to 6.6.3] - Self-deadlock on statsMutex during /getIndexStatus

1 @ 0x4035df0 0x4046290 0x404627b 0x4045ff7 0x4082ad8 0x4820c6d 0x48344e0 0x4823f56 0x4820722 0x42e1434 0x42e330d 0x42e4884 0x42e0225 0x4063c01

#       0x4045ff6       sync.runtime_SemacquireMutex+0x46                                                                       /Users/amithk/.cbdepscache/exploded/x86_64/go-1.13.7/go/src/runtime/sema.go:71

#       0x4082ad7       sync.(*RWMutex).Lock+0x87                                                                               /Users/amithk/.cbdepscache/exploded/x86_64/go-1.13.7/go/src/sync/rwmutex.go:103

#       0x4820c6c       github.com/couchbase/indexing/secondary/manager.(*requestHandlerContext).memCacheStats+0x3c             /Users/amithk/workdir7/goproj/src/github.com/couchbase/indexing/secondary/manager/request_handler.go:579

#       0x48344df       github.com/couchbase/indexing/secondary/manager.(*requestHandlerContext).getStatsFromCache+0x59f        /Users/amithk/workdir7/goproj/src/github.com/couchbase/indexing/secondary/manager/request_handler.go:2833

#       0x4823f55       github.com/couchbase/indexing/secondary/manager.(*requestHandlerContext).getIndexStatus+0x2a05          /Users/amithk/workdir7/goproj/src/github.com/couchbase/indexing/secondary/manager/request_handler.go:732

#       0x4820721       github.com/couchbase/indexing/secondary/manager.(*requestHandlerContext).handleIndexStatusRequest+0x461 /Users/amithk/workdir7/goproj/src/github.com/couchbase/indexing/secondary/manager/request_handler.go:528

#       0x42e1433       net/http.HandlerFunc.ServeHTTP+0x43                                                                     /Users/amithk/.cbdepscache/exploded/x86_64/go-1.13.7/go/src/net/http/server.go:2007

#       0x42e330c       net/http.(*ServeMux).ServeHTTP+0x1bc                                                                    /Users/amithk/.cbdepscache/exploded/x86_64/go-1.13.7/go/src/net/http/server.go:2387

#       0x42e4883       net/http.serverHandler.ServeHTTP+0xa3                                                                   /Users/amithk/.cbdepscache/exploded/x86_64/go-1.13.7/go/src/net/http/server.go:2802

#       0x42e0224       net/http.(*conn).serve+0x874