High Setting up a BGP Link State session with a router able to advertise IPv6 prefix causes BGPDocumentedException which in turn close the BGP session. Then, ODL try to setup again the BGP session which ended for the same reason going into an infinite loop of BGP session open / close until the BGP peer is removed. Karaf log contains the following error:
2022-07-04T09:30:09,800 | ERROR | epollEventLoopGroup-5-1 | BGPDocumentedException | 221 - org.opendaylight.bgpcep.bgp-parser-api - 0.17.0.SNAPSHOT | Error = MALFORMED_ATTR_LIST org.opendaylight.protocol.bgp.parser.BGPDocumentedException: Could not parse BGP attributes. at org.opendaylight.protocol.bgp.parser.impl.message.BGPUpdateMessageParser.parseAttributes(BGPUpdateMessageParser.java:205) [bundleFile:?] at org.opendaylight.protocol.bgp.parser.impl.message.BGPUpdateMessageParser.parseMessageBody(BGPUpdateMessageParser.java:155) [bundleFile:?] at org.opendaylight.protocol.bgp.parser.impl.message.BGPUpdateMessageParser.parseMessageBody(BGPUpdateMessageParser.java:66) [bundleFile:?] at org.opendaylight.protocol.bgp.parser.spi.pojo.SimpleMessageRegistry.parseBody(SimpleMessageRegistry.java:32) [bundleFile:?] at org.opendaylight.protocol.bgp.parser.spi.AbstractMessageRegistry.parseMessage(AbstractMessageRegistry.java:66) [bundleFile:?] at org.opendaylight.protocol.bgp.rib.impl.BGPByteToMessageDecoder.decode(BGPByteToMessageDecoder.java:47) [bundleFile:?] at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:507) [bundleFile:4.1.69.Final] at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:446) [bundleFile:4.1.69.Final] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276) [bundleFile:4.1.69.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [bundleFile:4.1.69.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [bundleFile:4.1.69.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [bundleFile:4.1.69.Final] at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324) [bundleFile:4.1.69.Final] at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:311) [bundleFile:4.1.69.Final] at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:432) [bundleFile:4.1.69.Final] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276) [bundleFile:4.1.69.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [bundleFile:4.1.69.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [bundleFile:4.1.69.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [bundleFile:4.1.69.Final] at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) [bundleFile:4.1.69.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [bundleFile:4.1.69.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [bundleFile:4.1.69.Final] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) [bundleFile:4.1.69.Final] at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:795) [bundleFile:4.1.69.Final] at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe$1.run(AbstractEpollChannel.java:425) [bundleFile:4.1.69.Final] at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164) [bundleFile:4.1.69.Final] at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469) [bundleFile:4.1.69.Final] at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:384) [bundleFile:4.1.69.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986) [bundleFile:4.1.69.Final] at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [bundleFile:4.1.69.Final] at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [bundleFile:4.1.69.Final] at java.lang.Thread.run(Thread.java:829) [?:?] Caused by: java.lang.IndexOutOfBoundsException: dstIndex: 0 at io.netty.buffer.UnsafeByteBufUtil.getBytes(UnsafeByteBufUtil.java:484) ~[bundleFile:4.1.69.Final] at io.netty.buffer.PooledUnsafeDirectByteBuf.getBytes(PooledUnsafeDirectByteBuf.java:130) ~[bundleFile:4.1.69.Final] at io.netty.buffer.AbstractUnpooledSlicedByteBuf.getBytes(AbstractUnpooledSlicedByteBuf.java:243) ~[bundleFile:4.1.69.Final] at io.netty.buffer.AbstractByteBuf.readBytes(AbstractByteBuf.java:896) ~[bundleFile:4.1.69.Final] at org.opendaylight.protocol.util.Ipv4Util.prefixForByteBuf(Ipv4Util.java:141) ~[bundleFile:?] at org.opendaylight.protocol.util.Ipv4Util.prefixForByteBuf(Ipv4Util.java:125) ~[bundleFile:?] at org.opendaylight.protocol.bgp.linkstate.impl.tlvs.ReachTlvParser.parseTlvBody(ReachTlvParser.java:37) ~[bundleFile:?] at org.opendaylight.protocol.bgp.linkstate.impl.tlvs.ReachTlvParser.parseTlvBody(ReachTlvParser.java:26) ~[bundleFile:?] at org.opendaylight.protocol.bgp.linkstate.spi.pojo.SimpleNlriTypeRegistry.parseTlv(SimpleNlriTypeRegistry.java:205) ~[bundleFile:?] at org.opendaylight.protocol.bgp.linkstate.spi.pojo.SimpleNlriTypeRegistry.parseSubTlvs(SimpleNlriTypeRegistry.java:212) ~[bundleFile:?] at org.opendaylight.protocol.bgp.linkstate.impl.nlri.AbstractPrefixNlriParser.parsePrefixDescriptor(AbstractPrefixNlriParser.java:50) ~[bundleFile:?] at org.opendaylight.protocol.bgp.linkstate.impl.nlri.AbstractPrefixNlriParser.parseObjectType(AbstractPrefixNlriParser.java:37) ~[bundleFile:?] at org.opendaylight.protocol.bgp.linkstate.spi.AbstractNlriTypeCodec.parseTypeNlri(AbstractNlriTypeCodec.java:24) ~[bundleFile:?] at org.opendaylight.protocol.bgp.linkstate.spi.pojo.SimpleNlriTypeRegistry.parseNlriType(SimpleNlriTypeRegistry.java:175) ~[bundleFile:?] at org.opendaylight.protocol.bgp.linkstate.impl.nlri.LinkstateNlriParser.parseNlri(LinkstateNlriParser.java:98) ~[bundleFile:?] at org.opendaylight.protocol.bgp.linkstate.impl.nlri.LinkstateNlriParser.parseNlri(LinkstateNlriParser.java:130) ~[bundleFile:?] at org.opendaylight.protocol.bgp.parser.spi.pojo.SimpleNlriRegistry.parseMpReach(SimpleNlriRegistry.java:232) ~[bundleFile:?] at org.opendaylight.protocol.bgp.parser.impl.message.update.MPReachAttributeParser.parseAttribute(MPReachAttributeParser.java:42) ~[bundleFile:?] at org.opendaylight.protocol.bgp.parser.spi.pojo.SimpleAttributeRegistry.parseAttributes(SimpleAttributeRegistry.java:172) ~[bundleFile:?] at org.opendaylight.protocol.bgp.parser.impl.message.BGPUpdateMessageParser.parseAttributes(BGPUpdateMessageParser.java:202) ~[bundleFile:?] ... 31 more
This is due to ReachTlvParser class in org.opendaylight.protocol.bgp.linkstate.impl.tlvs package which not properly handle IPv6 prefix in parseTlvBody method.