There is bz953776 that is partly about socket.close.  That regressed comparing rhel8 to rhel7, and it doesn't seem to be fixed upstream yet.  Not sure if it is fixable, since it smells like a dwarf quality problem:

=======
 8.0 Server x86_64 # stap -P  -vp4 -e 'probe socket.close { print(protocol) }'
Pass 1: parsed user script and 479 library scripts using 185108virt/76308res/8788shr/67208data kb, in 540usr/70sys/613real ms.
semantic error: while processing probe kernel.function("sock_release@net/socket.c:616") from: socket.close from: socket.close

semantic error: failed to retrieve location attribute for 'sock' [man error::dwarf]: identifier '$sock' at /usr/share/systemtap/tapset/linux/socket.stp:713:29
        dieoffset: 0x89c9c19 from /usr/lib/debug/lib/modules/4.18.0-40.el8.x86_64/vmlinux
        function: sock_release at net/socket.c:618:2 inlined by kernel_accept at net/socket.c:3254:3
        source:         protocol = @_sock_prot_num($sock)
                                                   ^
        in expansion of macro: operator '@sock' at /usr/share/systemtap/tapset/linux/socket.stp:39:5
        source:         ( &@sock[0] ? ( @sock->sk ? @sock->sk->sk_protocol : -1 ) : -1 )
                           ^
        in expansion of macro: operator '@_sock_prot_num' at /usr/share/systemtap/tapset/linux/socket.stp:713:13
        source:         protocol = @_sock_prot_num($sock)
                                   ^

semantic error: failed to retrieve location attribute for 'sock' [man error::dwarf]: identifier '$sock' at :713:29
        dieoffset: 0x89c9c19 from /usr/lib/debug/lib/modules/4.18.0-40.el8.x86_64/vmlinux
        function: sock_release at net/socket.c:618:2 inlined by kernel_accept at net/socket.c:3254:3
        source:         protocol = @_sock_prot_num($sock)
                                                   ^
        in expansion of macro: operator '@sock' at /usr/share/systemtap/tapset/linux/socket.stp:39:5
        source:         ( &@sock[0] ? ( @sock->sk ? @sock->sk->sk_protocol : -1 ) : -1 )
                           ^
        in expansion of macro: operator '@_sock_prot_num' at /usr/share/systemtap/tapset/linux/socket.stp:713:13
        source:         protocol = @_sock_prot_num($sock)
                                   ^

Pass 2: analyzed script: 13 probes, 3 functions, 1 embed, 8 globals using 240588virt/133192res/10432shr/122688data kb, in 2300usr/130sys/2439real ms.
Pass 2: analysis failed.  [man error::pass2]
(1)  8.0 Server x86_64 # 
=======

I think the original bug is mostly x86_64 related.  On rhel7 this used to work on non ppc* arches.