Test cases:
 - compiler/loopopts/superword/TestAliasingFuzzer.java#vanilla
 - compiler/loopopts/superword/TestAliasingFuzzer.java#random-flags

The main logs show e.g.

Output and diagnostic info for process 85024 was saved into 'pid-85024-output.log'

Code Generation: 1.2900121
Code Compilation: 12.093837
Running Tests: 109.559235
----------System.err:(3/35)----------

JavaTest Message: Test complete.

result: Error. "driver" action timed out with a timeout of 120 seconds on agent 42

The timeout handler logs and crash dumps show nothing. The driver process appears to be executing no test code at all and the main threads is doing I/O:

"tid": "3",
            "time": "2025-09-04T18:28:03.735156Z",
            "name": "main",
            "state": "RUNNABLE",
            "stack": [
              "java.base\/sun.nio.ch.Net.poll(Native Method)",
              "java.base\/sun.nio.ch.NioSocketImpl.park(NioSocketImpl.java:190)",
              "java.base\/sun.nio.ch.NioSocketImpl.timedRead(NioSocketImpl.java:279)",
              "java.base\/sun.nio.ch.NioSocketImpl.implRead(NioSocketImpl.java:302)",
              "java.base\/sun.nio.ch.NioSocketImpl.read(NioSocketImpl.java:354)",
              "java.base\/sun.nio.ch.NioSocketImpl$1.read(NioSocketImpl.java:798)",
              "java.base\/java.net.Socket$SocketInputStream.implRead(Socket.java:981)",
              "java.base\/java.net.Socket$SocketInputStream.read(Socket.java:971)",
              "java.base\/java.io.BufferedInputStream.fill(BufferedInputStream.java:289)",
              "java.base\/java.io.BufferedInputStream.read(BufferedInputStream.java:308)",
              "java.base\/java.io.FilterInputStream.read(FilterInputStream.java:71)",
              "com.sun.javatest.regtest.agent.AgentServer.run(AgentServer.java:238)",
              "com.sun.javatest.regtest.agent.AgentServer.main(AgentServer.java:71)"

Suspicion is that this could be a test harness and/or infra issue as we have seen similar odd timeouts.