Hi, I had this deadlock a few times, running geoserver 2.18.1 and just doing WMS and WFS requests. Java8 on Linux EL7.
You can check on the thread dump that we have a runnable thread opening a ZIP file, while all the other threads are blocked trying to get a xsd schema. Runnable thread: Full thread dump OpenJDK 64-Bit Server VM (25.292-b10 mixed mode): "localhost-startStop-2" #711 daemon prio=5 os_prio=0 tid=0x00007f3b70038000 nid=0xbb7 runnable [0x00007f3b49022000] java.lang.Thread.State: RUNNABLE at java.util.zip.ZipFile.open(Native Method) at java.util.zip.ZipFile.<init>(ZipFile.java:225) One of the blocked threads: "http-nio-15080-exec-220" #594 daemon prio=5 os_prio=0 tid=0x00007f3b78098000 nid=0x6f3 waiting for monitor entry [0x00007f3b48210000] java.lang.Thread.State: BLOCKED (on object monitor) at org.geotools.xsd.XSD.getSchema(XSD.java:184) - waiting to lock <0x00000000c2c4ef98> (a org.geoserver.wfs.xml.v1_1_0.WFS) at org.geotools.xsd.SchemaLocator.locateSchema(SchemaLocator.java:86) Are you able to check something about it? I opened an issue with an attachment: https://osgeo-org.atlassian.net/browse/GEOS-10132 Cheers, *Tiago Vieira*
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