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Dissector bug, protocol AMQP

asked 2020-07-08 08:12:44 +0000

MarkSy gravatar image

I'm seeing this error in Wireshark - 3.2.5 (v3.2.5-0-ged20ddea8138) - on Windows 10 x64.

> Advanced Message Queueing Protocol
>     Length: 24
>         [Expert Info (Error/Malformed): Bad frame length]
>             [Bad frame length]
>             [Severity level: Error]
>             [Group: Malformed]
>     Doff: 195
>     Type: Unknown (91)
>     Channel: 31392 [Dissector bug, protocol AMQP:
> C:\buildbot\builders\wireshark-3.2-64\windows-2019-x64\build\epan\dissectors\packet-tcp.c:3750:failed assertion "proto_desegment && pinfo->can_desegment"]
>     [Expert Info (Error/Malformed): C:\buildbot\builders\wireshark-3.2-64\windows-2019-x64\build\epan\dissectors\packet-tcp.c:3750:failed assertion "proto_desegment &&pinfo->can_desegment"]
>         [C:\buildbot\builders\wireshark-3.2-64\windows-2019-x64\build\epan\dissectors\packet-tcp.c:3750:failed assertion "proto_desegment &&pinfo->can_desegment"]
>         [Severity level: Error]
>         [Group: Malformed]

The AMQP messages are coming from an Apache QPID server - I was using Wireshark to diagnose why my receiver process wasn't reporting any messages so this may be related.

Any suggestions about ways forward?

Thanks,

Mark

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answered 2020-07-08 08:32:26 +0000

grahamb gravatar image

The place for bugs is over at the Wireshark Bugzilla. Attaching a capture that illustrates the issue helps immensely.

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I.e., "Dissector bug" means exactly what it says - there's a bug in Wireshark's dissector code.

I was using Wireshark to diagnose why my receiver process wasn't reporting any messages so this may be related.

It might be that the sending process is either 1) violating the protocol or 2) sending correct but unusual packets in a fashion that not only causes the receiver to discard the messages without reporting them bug also triggers a bug in some Wireshark code that wasn't careful enough to be able to deal with that.

But getting a "Dissector bug" report does not necessarily mean that the packet sender is making any mistakes whatsoever, so this may be completely unrelated.

Guy Harris gravatar imageGuy Harris ( 2020-07-09 02:21:38 +0000 )edit
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Asked: 2020-07-08 08:12:44 +0000

Seen: 1,902 times

Last updated: Jul 08 '20