[zeromq-dev] UDP Multicast - Problem with large message sizes?

[Stephan Opfer]

Found this one: https://github.com/zeromq/libzmq/issues/2009

Is it still not fixed? According to github it needs stacktraces. Should 
I post mine there?

On 09.09.19 21:09, Stephan Opfer wrote:
> Hi all,
>
> when I try to send large messages (~65kB) via UDP Multicast (per draft 
> API, RADIO/DISH), I instantly get
>
> Bad file descriptor (src/epoll.cpp:113)
> #0  0x7faad868ee90 in /usr/lib/x86_64-linux-gnu/libzmq.so.5 (?+0x0)
> #1  0x7faad868e870 in /usr/lib/x86_64-linux-gnu/libzmq.so.5 (?+0x0)
> #2  0x7faad86d72f0 in /usr/lib/x86_64-linux-gnu/libzmq.so.5 (?+0x0)
> #3  0x7faad86d8740 in /usr/lib/x86_64-linux-gnu/libzmq.so.5 (?+0x0)
> #4  0x7faad86d73d0 in /usr/lib/x86_64-linux-gnu/libzmq.so.5 (?+0x0)
> #5  0x7faad8692370 in /usr/lib/x86_64-linux-gnu/libzmq.so.5 (?+0x0)
> #6  0x7faad868e120 in /usr/lib/x86_64-linux-gnu/libzmq.so.5 (?+0x0)
> #7  0x7faad86d3440 in /usr/lib/x86_64-linux-gnu/libzmq.so.5 (?+0x0)
> #8  0x7faad75b46db in /lib/x86_64-linux-gnu/libpthread.so.0 
> (start_thread+0xdb)
> #9  0x7faad699e8c8 in /lib/x86_64-linux-gnu/libc.so.6 (clone+0x3f)
>
> Is it known, that the draft API has Problems with large message sizes?
>
> What does the assertion in line epoll.cpp:113 actually check and what 
> could be the reason to make it fail?
>
> Do you need a MWE in order to investigate it? I probably can create a 
> simple main, that reproduces this error.
>
> Last remark (not 100% sure about this): If I reduce the message size 
> to ~2kB, it takes several of these message (~254) to get this error, 
> but the number of messages seems to be always the same.
>
> Greetings
>
>   Stephan
>
>
-- 
Distributed Systems Research Group
Stephan Opfer  T. +49 561 804-6283  F. +49 561 804-6277
Univ. Kassel,  FB 16,  Wilhelmshöher Allee 73,  D-34121 Kassel
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