Re: [openflowplugin-dev] openflowjava IOB Exception in netvirt csit

Tomáš Slušný <tomas.slusny@...>


thanks for your response, it helped me to probably find cause of this issue. Issue is that set-field action deserializer in single layer serialization is not skipping padding at end of set-field action, so then it have some left-over zeros, and based on logs it then tries to deserialize OutputAction (what type is 0) but body does not match, so it fails. I will try to make fix for this as soon as possible. But until then, with single-layer-serialization disabled it will work.



Od: Jamo Luhrsen <jluhrsen@...>
Odoslané: piatok, 12. mája 2017 6:42
Komu: Tomáš Slušný; openflowplugin-dev@...; openflowjava-dev@...; netvirt-dev@...
Predmet: Re: [openflowplugin-dev] openflowjava IOB Exception in netvirt csit

I spent some time trying to figure this out (too much probably...) :) and correct me if
I'm wrong but this IOBE is coming from a flow that already exists on the switch and not
one we are trying to program. I do notice in a test I did that the IOBE comes every
~3s which I think is our default polling of operational.

anyway, I *think* narrowed down the exact test case that introduces this, and then compared
the flow table before and after that test case. The only difference are these two flows:

 cookie=0x8000006, duration=0.810s, table=21, n_packets=0, n_bytes=0, priority=10,ip,metadata=0x30d52/0xfffffe
 cookie=0x8000006, duration=0.810s, table=26, n_packets=0, n_bytes=0, priority=5,ip,metadata=0x30d52/0xfffffe

full flow table here [0]

I am only able to check these things with our CSIT stuff. I tried to manually create a flow that
looks like the table=26 flow above (via NB rest) but couldn't figure it out. I think my trouble
was trying to give a mask to the metadata.

Anything help?

I didn't try with serialization disabled yet, as that is gonna take some time to figure out
how to toggle it with our CSIT.



On 05/10/2017 01:04 AM, Tomáš Slušný wrote:
> Hi Jamo,
> can you please try if this issue also occurs with single-layer serialization disabled? Here is link to wiki on how to disable
> it:
> Also, can you send dump of flows (or ideally only that single flow that is failing when OFP is tryining to deserialize it)
> from ovs?
> Regards,
> Tomas
> -----------------------------------------------------------------------------------------------------------------------------
> *Od:* Jamo Luhrsen <jluhrsen@...>
> *Odoslané:* utorok, 9. mája 2017 21:24
> *Komu:* openflowplugin-dev@...; openflowjava-dev@...; netvirt-dev@...
> *Predmet:* [openflowplugin-dev] openflowjava IOB Exception in netvirt csit

> Hi OFP, OFJ, Netvirt,
> I'm debugging some failures in netvirt CSIT and saw an exception I don't remember
> seeing before (not that it's new, I just haven't seen it. although I dig at these
> things daily)
> 2017-05-09 15:52:45,124 | WARN  | entLoopGroup-7-5 | OFDecoder                        | 268 -
> org.opendaylight.openflowjava.openflow-protocol-impl - 0.9.0.SNAPSHOT | Message deserialization failed
> java.lang.IndexOutOfBoundsException: readerIndex(166) + length(4) exceeds writerIndex(166): UnpooledSlicedByteBuf(ridx: 166,
> widx: 166, cap: 166/166, unwrapped: PooledUnsafeDirectByteBuf(ridx: 13896, widx: 13896, cap: 16384))
>         at io.netty.buffer.AbstractByteBuf.checkReadableBytes0([117:io.netty.buffer:4.1.8.Final]
>         at io.netty.buffer.AbstractByteBuf.readInt([117:io.netty.buffer:4.1.8.Final]
>         at io.netty.buffer.AbstractByteBuf.readUnsignedInt([117:io.netty.buffer:4.1.8.Final]
> There are a lot of them (~1200) over a 90m system test job.
> I don't know yet if they are related to the failures I am debugging, but something is not right.
> Any comments? Need a bug?
> here is the full karaf log:
> Thanks,
> JamO
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> TomášSlušný
> Software Developer
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Tomáš Slušný
Software Developer
PANTHEON technologies s.r.o.
Janka Kráľa 9, 974 01 Banská Bystrica
Tel / +421 220 665 111
MAIL / tomas.slusny@...

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