I think I understand the waste of sockets. If bad codes open a socket for reading or writing without close, here leave some useless socket fd here.
But in your case, I want to understand what the kind of bad codes is. I restart swift-init, but find something seems clean.
I restart swif with swift-init main start -n. With a pstree here, (worker is default 1):
─tmux(55319)─┬─bash(55411)───keystone-all(64641)
        │                  └─bash(62276)───swift-init(47727)─┬─swift-proxy-ser(47728)───swift-proxy-ser(47800)
        │                                                                                     ├─swift-container(47729)───swift-container(47798)
        │                                                                                     ├─swift-container(47730)───swift-container(47797)
        │                                                                                     ├─swift-container(47731)───swift-container(47799)
        │                                                                                     ├─swift-container(47732)───swift-container(47790)
        │                                                                                     ├─swift-account-s(47733)───swift-account-s(47782)
        │                                                                                     ├─swift-account-s(47734)───swift-account-s(47768)
        │                                                                                     ├─swift-account-s(47735)───swift-account-s(47805)
        │                                                                                     ├─swift-account-s(47736)───swift-account-s(47793)
        │                                                                                     ├─swift-object-se(47737)───swift-object-se(47788)
        │                                                                                     ├─swift-object-se(47738)───swift-object-se(47770)
        │                                                                                     ├─swift-object-se(47739)───swift-object-se(47796)
        │                                                                                     └─swift-object-se(47740)───swift-object-se(47787)
Use process of proxy-server as example:
swift-init's fd:
lrwx------ 1 swift swift 64 Mar 15 13:35 0 -> /dev/pts/5
lrwx------ 1 swift swift 64 Mar 15 13:35 1 -> /dev/pts/5
lrwx------ 1 swift swift 64 Mar 15 13:35 2 -> /dev/pts/5
proxy-server's fd:
lrwx------ 1 swift swift 64 Mar 15 13:37 0 -> /dev/null
lrwx------ 1 swift swift 64 Mar 15 13:37 1 -> /dev/null
lrwx------ 1 swift swift 64 Mar 15 13:37 2 -> /dev/pts/5
lrwx------ 1 swift swift 64 Mar 15 13:37 3 -> socket:[456183]
lrwx------ 1 swift swift 64 Mar 15 13:37 4 -> socket:[456199]
lrwx------ 1 swift swift 64 Mar 15 13:37 5 -> socket:[456290]
lrwx------ 1 swift swift 64 Mar 15 13:37 6 -> socket:[456291]
lrwx------ 1 swift swift 64 Mar 15 13:37 7 -> socket:[456292]
fd of proxy's worker;
lrwx------ 1 swift swift 64 Mar 15 13:37 0 -> /dev/null
lrwx------ 1 swift swift 64 Mar 15 13:37 1 -> /dev/null
lrwx------ 1 swift swift 64 Mar 15 13:37 2 -> /dev/pts/5
lrwx------ 1 swift swift 64 Mar 15 13:37 3 -> socket:[456183]
lrwx------ 1 swift swift 64 Mar 15 13:37 4 -> socket:[456303]
lrwx------ 1 swift swift 64 Mar 15 13:37 5 -> socket:[456304]
lrwx------ 1 swift swift 64 Mar 15 13:37 7 -> socket:[456292]
lrwx------ 1 swift swift 64 Mar 15 13:37 8 -> socket:[456295]

only 456292 is avail, which binds (0.0.0.0:8080, 0.0.0.0:0)

now, is any fd wasted? Besides unavailable socket.