Jenkins experiences a performance degradation or hangs.
Analysis of the
thread-dump.txt or slow request files from a Support Bundle, or full thread dumps generated by
jenkinshangWithJstack.sh (Linux), or
getThreadDumps.bat (Windows) shows one or more threads with a thread stack in socketRead() to an external resource as shown in the following snippets:
16019msec elapsed in Handling GET /jenkins/job/xxxxxxx/xxxxx/ from xx.xxx.xx.xxx java.net.SocketInputStream.socketRead0(Native Method) java.net.SocketInputStream.socketRead(SocketInputStream.java:116) java.net.SocketInputStream.read(SocketInputStream.java:171) java.net.SocketInputStream.read(SocketInputStream.java:141)
"Connecting to ldap://xx.xxx.xxx:xxxx/ : Handling GET / from xxx.xx.xx.xxx" java.lang.Thread.State: RUNNABLE at java.net.SocketInputStream.socketRead0(Native Method) at java.net.SocketInputStream.socketRead(SocketInputStream.java:116) at java.net.SocketInputStream.read(SocketInputStream.java:170) at java.net.SocketInputStream.read(SocketInputStream.java:141)
The issue is not caused by Jenkins. The specific external resource that Jenkins is expecting a response from should be investigated to confirm that it responds to the request in an acceptable amount of time.