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When an upload has been started (i.e. STOR has been executed and its first response has been sent) but no data has yet been transmitted, closing the control connection will not close the data connection.
The data connection will be closed whenever any data arrives as glftpd will then realize that the control connection is gone.
Sending ABOR will not work either in this case, since ABOR for some reason only triggers when data is received on the data connection, so as long as no data is received the ABOR will hang. This is in itself another bug.