[erlang-questions] hanging nodes

Lukas Larsson <>
Wed Aug 20 15:19:15 CEST 2014


Forgot the link to WinDbg[1].

   [1]: http://msdn.microsoft.com/en-us/windows/hardware/hh852365.aspx


On Wed, Aug 20, 2014 at 3:08 PM, Lukas Larsson <> wrote:

> Hello Vlad,
>
> This is most probably a windows only issue as the code in the stacktrace
> runs through a lot of windows specific code. I guess the easiest way would
> be if you are able to write a testcase that can reproduce the error so that
> I can debug it here. If that is not possible, maybe you can attach to the
> process and send me a windows "core file"?
>
> To do this you have to install WinDbg[1] and then do "File->Attach to a
> Process". After this you open the WinDbg console and type ".dump /ma
> c:\beam.smp.dmp" and then upload that file on a server where I can download
> it. Also I assume you have used one of the installers on erlang.org?
> Which version of windows+Erlang/OTP are you using?
>
> Lukas
>
>
> On Wed, Aug 20, 2014 at 11:18 AM, Vlad Dumitrescu <>
> wrote:
>
>> Some details: the beam process seems to have a thread that sits and does
>> something. I don't know if the following example stack helps.
>>
>> best regards,
>> Vlad
>>
>> wow64cpu.dll!TurboDispatchJumpAddressEnd+0x63b
>> wow64.dll!Wow64SystemServiceEx+0x1ce
>> wow64.dll!Wow64LdrpInitialize+0x42a
>> ntdll.dll!RtlIsDosDeviceName_U+0x23a27
>> ntdll.dll!LdrInitializeThunk+0xe
>>
>> kernel32.dll!SetEvent+0x2
>> beam.smp.dll!fd_stop+0x4f
>> beam.smp.dll!terminate_port+0x64
>> beam.smp.dll!erts_deliver_port_exit+0x225
>> beam.smp.dll!driver_failure_atom+0x93
>> beam.smp.dll!ready_output+0xa9
>> beam.smp.dll!erts_port_task_execute+0x28d
>> beam.smp.dll!schedule+0xb24
>> beam.smp.dll!_process_main+0x125
>> ntdll.dll!RtlImageNtHeader+0x716
>> beam.smp.dll!do_erts_alcu_free+0x5f
>> beam.smp.dll!erts_alcu_free_thr_spec+0x58
>> beam.smp.dll!thr_wrapper+0xa6
>> kernel32.dll!BaseThreadInitThunk+0x12
>> ntdll.dll!RtlInitializeExceptionChain+0x63
>> ntdll.dll!RtlInitializeExceptionChain+0x36
>>
>>
>>
>> On Wed, Aug 20, 2014 at 10:26 AM, Vlad Dumitrescu <>
>> wrote:
>>
>>> Hi!
>>>
>>> I have some nodes that don't want to terminate and that I can't connect
>>> to. Most of the times the nodes unregister from epmd, but even when they
>>> don't they still are inaccessible.
>>>
>>> I was hoping that by connecting to the node I can see why it is hanging,
>>> but I get the feeling that the hanging is not inside user code (because
>>> epmd detects the socket being closed, so the shutdown process is started).
>>>
>>> This is on Windows, but I have some reports for something that looks
>>> similar from Linux too.
>>> I'm not used to debugging this kind of situations, so I hope that
>>> someone has some advice for me.
>>>
>>> best regards,
>>> Vlad
>>>
>>>
>>>
>>>
>>
>> _______________________________________________
>> erlang-questions mailing list
>> 
>> http://erlang.org/mailman/listinfo/erlang-questions
>>
>>
>
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