[erlang-questions] How to diagnose stuck Erlang node

Kirill Zaborsky <>
Mon Nov 28 11:01:17 CET 2011

I'm using halfword emulator on 64bit Ubuntu Server
And the process state is not "waiting" but "running". Previous crash dumps
show the same program counter value (and user_drv in running state)

Kind regards,
Kirill Zaborsky

2011/11/28 Dennis Novikov <>

> On Mon, 28 Nov 2011 08:44:42 +0200, Kirill Zaborsky <>
> wrote:
>  Trying to fins any workaround to this "stuck node" scenario I've upgraded
>> to R14B04 and turned on "heart".
>> But recently  the node once again stopped responding. And heart did not
>> assume it to be stuck although I could not contact it.
>> I've tried to to get a crashdump with 'kill -USR1' but it appeared that
>> once again crash dump was truncated. Does heart kills "dead" erlang node?
>> And the only thing that could be seen from the crash dump that the only
>> running process was user_drv (just like in previous times) with program
>> counter equal to "user_drv:server_loop/5 + 48". Is it possible to find out
>> what exactly does it stands for?
> Waiting on receive in that function. And you are observing this on a
> 32-bit VM.
> --
> WBR,
>  DN
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