Hi All,

          This is to seek help on a strange issue that we are observing. We 
recently did a minor upgrade of Tomcat from 9.0.30 to 9.0.31, in our 
application, in order to address vulnerability in AJP connector. Ever since 
then we have started seeing upload failures with our upload servlet when 
processing large files. Small files do get uploaded, but when we upload large 
files and we do Multipart file upload, we are randomly and yet consistently 
seeing that we get the following exception.

[org.apache.commons.fileupload.FileUploadBase$IOFileUploadException: Processing 
of multipart/form-data request failed. Stream ended unexpectedly



       Caused by: 
org.apache.commons.fileupload.MultipartStream$MalformedStreamException: Stream 
ended unexpectedly



        at java.io.InputStream.read(InputStream.java:101)

        at org.apache.commons.fileupload.util.Streams.copy(Streams.java:100)

        at org.apache.commons.fileupload.util.Streams.copy(Streams.java:70)


          It appears that the connection is getting reset in the middle of the 
upload, but the client is very much up and we get PR_CONNECT_RESET_ERROR on the 

           My code on the server side is as simple as

            DiskFileItemFactory factory = new DiskFileItemFactory();

            ServletFileUpload fileUpload = new ServletFileUpload(factory);

            List fileItems = fileUpload.parseRequest(originalRequest);

      We would like to know if anyone else has observed this and if there is 
any way we can debug this further. When I try to attach and debug, the upload 
however seems to go through fine and is only failing when I am not attached to 
the process. Any help / suggestions would be much appreciated.



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