When we hit an error from sendmsg() called via:
smbd_smb2_flush_send_queue() from smbd_smb2_break_send()

We'll end up in smbXsrv_pending_break_done() and
smbXsrv_pending_break_submit() returning NT_STATUS_ABANDONED
in order to indicate that there's no more valid channel/transport
connection remaining for the smbXsrv_client.

In that case smbd stays for ever most likely sitting
in epoll_wait().