[zeromq-dev] Assertion failed: Address already in use

[Matthias Kluwe]

Hi!

I tried the current master today: Same result, except that the assertion
moved to line 323 in tcp_connecter.cpp.

Just a side note: Although I did have the feeling that you "should not
do" what my test code does, I did write that in purpose to see what
problems I might run into. In fact, it was *meant* to provoke an error
(to test some code of mine, and to see what kind of diagnostic I'd be
able to provide).

Matthias

Am 04.06.2014 11:09, schrieb Pieter Hintjens:
> It may well be a Windows issue.
> 
> You're right that the exception should not be escaping. It's also a
> strange error to get in the tcp_connector... Could you test again with
> the current master, and perhaps we can dig in to see what's happening.
> 
> -Pieter
> 
> On Wed, Jun 4, 2014 at 7:33 AM, Matthias Kluwe <mkluwe at gmail.com> wrote:
>> Obviously it is. I won't really do this in real code.
>>
>> I just was surprised by the uncaught exception escaping from the library.
>>
>> Perhaps this is a Windows specific issue. The test code runs for hours on my
>> Ubuntu box.
>>
>> Am 03.06.2014 22:43 schrieb "Pieter Hintjens" <ph at imatix.com>:
>>
>>> It's poor design to bind on the same port over and over like this.
>>> There are timing dependent tear-downs that will hit. E.g. as long as
>>> there's a pending connection, the bound address won't be free for new
>>> binds.
>>>
>>>
>>> On Tue, Jun 3, 2014 at 10:40 PM, Matthias Kluwe <mkluwe at gmail.com> wrote:
>>>> Hi!
>>>>
>>>> I'm experiencing an unexpected error when using and tearing down a ZMQ
>>>> context in a rapid sequence. I tried this with Windows XP using ZeroMQ
>>>> 4.04.
>>>>
>>>> Test code is as follows (using a "fresh" REQ-REP connection once in a
>>>> loop):
>>>>
>>>>     #include "zmq.h"
>>>>     #include <string.h>
>>>>
>>>>     int c_send_receive() {
>>>>         char buf[ 4 ];
>>>>
>>>>         void *ctx = zmq_ctx_new();
>>>>         if ( ctx == 0 ) return 0;
>>>>
>>>>         void *rep = zmq_socket( ctx, ZMQ_REP );
>>>>         if ( rep == 0 ) return 0;
>>>>         if ( zmq_bind( rep, "tcp://*:5555" ) == -1 ) return 0;
>>>>
>>>>         void *req = zmq_socket( ctx, ZMQ_REQ );
>>>>         if ( req == 0 ) return 0;
>>>>         if ( zmq_connect( req, "tcp://localhost:5555" ) == -1 )
>>>>             return 1;
>>>>
>>>>         if ( zmq_send( req, "MSG", 3, 0 ) == -1 ) return 0;
>>>>         memset( buf, 0, 4 );
>>>>         if ( zmq_recv( rep, buf, 3, 0 ) == -1 ) return 0;
>>>>         if ( strcmp( "MSG", buf ) != 0 ) return 0;
>>>>
>>>>         if ( zmq_close( rep ) == -1 ) return 0;
>>>>         if ( zmq_close( req ) == -1 ) return 0;
>>>>         if ( zmq_ctx_term( ctx ) == -1 ) return 0;
>>>>
>>>>         return 1;
>>>>     }
>>>>
>>>>     int main() {
>>>>         while ( c_send_receive() );
>>>>     }
>>>>
>>>> The code above tries to check for all error code (hopefully), but it
>>>> fails throwing the following exception:
>>>>
>>>> Assertion failed: Address already in use
>>>> (..\..\..\src\tcp_connecter.cpp:284)
>>>>
>>>> I guess this is due to ZeroMQ encountering some unexpected condition.
>>>>
>>>> Regards,
>>>> Matthias