JDK-8238376 : test/jdk/java/nio/channels/DatagramChannel/Loopback.java failing on multi-homed systems
  • Type: Bug
  • Component: core-libs
  • Sub-Component: java.nio
  • Affected Version: 15
  • Priority: P2
  • Status: Closed
  • Resolution: Fixed
  • Submitted: 2020-02-03
  • Updated: 2021-07-05
  • Resolved: 2020-02-10
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JDK 15
15 b10Fixed
Related Reports
Relates :  
JDK-8236184 - (dc) IP_MULTICAST_* and IP_TOS socket options not effective
Description
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)
...
Comments
URL: https://hg.openjdk.java.net/jdk/jdk/rev/6a82085fc61d User: alanb Date: 2020-02-10 12:58:19 +0000
10-02-2020
This is a test issue. The test joins the multicast group on one interface and sends to the group using the interface selected by the system. We need to update the test to set the outgoing interface. The test systems in the CI don't run into this as they seem to have only be connected to one network.
09-02-2020