[Bug 56927] New: msys2-64/cygwin64: rsync fails with 'Socket operation on non-socket'

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=56927

Bug ID: 56927
           Summary: msys2-64/cygwin64: rsync fails with 'Socket operation
                    on non-socket'
           Product: Wine
           Version: 9.12
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: winsock
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 76749
  --> https://bugs.winehq.org/attachment.cgi?id=76749
Notes to reproduce, a backtrace in cygwin/wine.

I tried to check if bug #19858 is still an issue.
Unfortunately I hit a rsync call which fails:

$ rsync -aq --delete-before dir-a dir-b
  rsync: [Receiver] Failed to dup/close: Socket operation on non-socket (108)
  rsync error: error in IPC code (code 14) at pipe.c(157) [Receiver=3.2.7]
  rsync: connection unexpectedly closed (0 bytes received so far) [sender]
  rsync error: error in rsync protocol data stream (code 12) at io.c(231)

It looks like rsync forks a child process, and the child tries then to close
the derived socket, which cannot be found in closesocket/socket_list_remove.

This seems kind of similar to bug #54995.