test/jdk/java/nio/channels/DatagramChannel/Loopback.java

This test was introduced in JDK-8236184, it timeout/failed (reproducible) on linux-x64 when IP_MULTICAST_LOOP enabled.

"AgentVMThread" #252 prio=5 os_prio=0 cpu=12.40ms elapsed=1204.92s tid=0x00007f50083d4800 nid=0xeebc runnable [0x00007f4e118d6000]
   java.lang.Thread.State: RUNNABLE
at sun.nio.ch.DatagramChannelImpl.receive0(java.base@15-ea/Native Method)
at sun.nio.ch.DatagramChannelImpl.receiveIntoNativeBuffer(java.base@15-ea/DatagramChannelImpl.java:746)
at sun.nio.ch.DatagramChannelImpl.receive(java.base@15-ea/DatagramChannelImpl.java:724)
at sun.nio.ch.DatagramChannelImpl.untrustedReceive(java.base@15-ea/DatagramChannelImpl.java:581)
at sun.nio.ch.DatagramChannelImpl.receive(java.base@15-ea/DatagramChannelImpl.java:554)
at Loopback.test(Loopback.java:124)
at Loopback.main(Loopback.java:81)
...