[erlang-questions] Fwd: phantom ports in erlang:ports()

Patrik Nyblom <>
Tue Nov 13 17:19:37 CET 2012


Sounds like a bug allright.

Please send all relevant information, including platform, any special 
conditions (nif's, drivers whatnot) and any relevant logs etc to 
erlang_bugs or directly to me.

Cheers,
Patrik

On 11/13/2012 12:35 PM, Tim Watson wrote:
> Hi guys - can anyone answer this (below) please?
>
> Begin forwarded message:
>
>> From: Matthias Radestock <>
>> Subject: phantom ports in erlang:ports()
>> Date: 12 November 2012 18:37:47 GMT
>> To: 
>>
>> I've got a customer system, running R15B02, which encountered system_limit errors when accepting tcp connections.
>>
>> 'lsof' indicates that there are just a few hundred file descriptors in use. However, erlang:ports() returns 1010 entries. For the majority of these ports:
>> - erlang:port_info(Port) returns 'undefined'
>> - port_close(Port) fails with 'badarg'
>> - exit(Port, die) doesn't make them go away
>>
>> These ports have been in that state for days.
>>
>> Does anybody have any clue what's going on here?
>>
>> Is there any way to find out more about these ports? Looks like ctrl-c'ing in the emulator shell would allow me to get more info with the 'o' option. Unfortunately the customer's emulator is running detached, so that won't work.
>>
>> Regards,
>>
>> Matthias.
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