This has been observed once during same binaries run with b23 which is the first build with consolidated repository.
 
Please refer to the snippet of test output:
----------System.out:(1/19)----------
server sleeping...
----------System.err:(28/2000)----------
java.net.SocketException: Connection reset
at java.base/java.net.SocketInputStream.read(SocketInputStream.java:210)
at java.base/java.net.SocketInputStream.read(SocketInputStream.java:141)
at java.base/java.io.BufferedInputStream.fill(BufferedInputStream.java:252)
at java.base/java.io.BufferedInputStream.read1(BufferedInputStream.java:292)
at java.base/java.io.BufferedInputStream.read(BufferedInputStream.java:351)
at java.base/sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:746)
at java.base/sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:689)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1586)
at java.base/sun.net.www.protocol.http.HttpURLConnection.access$200(HttpURLConnection.java:97)
at java.base/sun.net.www.protocol.http.HttpURLConnection$9.run(HttpURLConnection.java:1483)
at java.base/sun.net.www.protocol.http.HttpURLConnection$9.run(HttpURLConnection.java:1481)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.AccessController.doPrivilegedWithCombiner(AccessController.java:793)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1480)
at java.base/java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:527)
at B6726695.test(B6726695.java:129)
at B6726695.main(B6726695.java:46)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:230)
at java.base/java.lang.Thread.run(Thread.java:844)