[erlang-questions] Seeing inet:start_timer badarg crash

[Vince Foley]

This is excellent info, thanks so much!

On Fri, Oct 12, 2018 at 6:39 PM Dominic Morneau <dmorneau@REDACTED> wrote:

> Hi Vince,
>
> That’s a bug introduced in:
> https://github.com/erlang/otp/pull/1694
>
> It happens when using an epmd_module that doesn’t implement the optional
> address_please callback.
>
> You can work around it by implementing address_please inside your
> EpmdClient module exactly like this:
>
> https://github.com/erlang/otp/blob/OTP-21.0.3/lib/kernel/src/erl_epmd.erl#L174
>
> Then inet_tcp_dist will pick up your implementation rather than the
> default case, which is broken because inet.getaddr/3’s last argument is not
> an address family, it’s a timeout:
>
> https://github.com/erlang/otp/blob/OTP-21.0.3/lib/kernel/src/inet_tcp_dist.erl#L450
>
> https://github.com/erlang/otp/blob/OTP-21.0.3/lib/kernel/src/inet_tcp_dist.erl#L289
>
> Dominic
>
> 2018年10月12日(金) 5:58 Vince Foley <vincefoley@REDACTED>:
>
>> Hello there, I'm seeing some crashes in my logs since updating to OTP 21
>> that I can't quite track down...
>>
>> The exit value looks like this:
>>
>> {
>>   :badarg,
>>   [
>>     {:erlang, :start_timer, [:inet, #PID<0.17713.363>, :inet], []},
>>     {:inet, :start_timer, 1, [file: 'inet.erl', line: 1763]},
>>     {:inet, :getaddr, 3, [file: 'inet.erl', line: 591]},
>>     {:inet_tcp_dist, :do_setup, 7, [file: 'inet_tcp_dist.erl', line: 289]}
>>   ]
>> }
>>
>> It looks like something is going wrong in the distributed node connection
>> system. The result that I can see from this is that the nodes are no longer
>> able to connect to each other.
>>
>> I am using a mechanism other than the standard `epmd` to discover the
>> other nodes, so I'm wondering if a detail changed that I have to adapt to.
>> I'm using `-epmd_module`. The mechanism I'm using is described in this
>> article:
>>
>>
>> https://www.erlang-solutions.com/blog/erlang-and-elixir-distribution-without-epmd.html
>>
>> That might be related but I don't quite see how. Does anyone have any
>> ideas what might be happening here?
>>
>> Thanks!
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>
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