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  1. JGroups
  2. JGRP-2552

NullPointerException in GMS caused by FD_SOCK

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Details

    • Bug
    • Resolution: Done
    • Major
    • 5.1.7, 4.2.13
    • 4.2.12
    • None
    • False
    • False
    • Undefined

    Description

      FD_SOCK passes it's suspected_mbrs collection up in the SUSPECT event instead of making a copy.

      If another thread changes the suspected_mbrs collection while GMS is handling the SUSPECT event, GMS may insert a null element in the Request array, causing a NullPointerException:

      java.lang.NullPointerException
	at java.base/java.util.Objects.requireNonNull(Objects.java:221)
	at java.base/java.util.concurrent.ConcurrentLinkedQueue.offer(ConcurrentLinkedQueue.java:355)
	at java.base/java.util.concurrent.ConcurrentLinkedQueue.add(ConcurrentLinkedQueue.java:283)
	at org.jgroups.protocols.pbcast.ViewHandler._add(ViewHandler.java:206)
	at org.jgroups.protocols.pbcast.ViewHandler.add(ViewHandler.java:70)
	at org.jgroups.protocols.pbcast.GMS.up(GMS.java:853)
	at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:247)
	at org.jgroups.stack.Protocol.up(Protocol.java:299)
	at org.jgroups.protocols.pbcast.NAKACK2.up(NAKACK2.java:583)
	at org.jgroups.protocols.FD_SOCK.suspect(FD_SOCK.java:501)
	at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:261)
	at org.jgroups.protocols.MERGE3.up(MERGE3.java:281)
	at org.jgroups.protocols.Discovery.up(Discovery.java:300)
	at org.jgroups.protocols.TP.passMessageUp(TP.java:1400)
	at org.jgroups.util.SubmitToThreadPool$SingleLoopbackHandler.run(SubmitToThreadPool.java:72)

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          causes

          Bug - A problem that impairs or prevents the functions of the product. ISPN-12954 AsyncBackupTest.destroy sometimes hangs

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • New

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            People

              rhn-engineering-bban Bela Ban
              dberinde@redhat.com Dan Berindei (Inactive)
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              Dates

                Created:
                Updated:
                Resolved: