Ok I'll see about using the most recent erlang version. Thanks for the tip.
On Monday, August 22, 2022 at 10:23:23 AM UTC-7 Stephen Baldwin wrote:
> I can successfully run the cerl -debug vm from the sym link:
>
> root@:~# erts-11.2.2.15/bin/cerl -debug
> Erlang/OTP 23 [erts-11.2.2.15] [source] [64-bit] [smp:12:12] [ds:12:12:10]
> [async-threads:1] [hipe] [type-assertions] [debug-compiled] [lock-checking]
>
> Eshell V11.2.2.15 (abort with ^G)
> 1>
>
>
> On Monday, August 22, 2022 at 10:17:39 AM UTC-7 Stephen Baldwin wrote:
>
>> Hey José,
>>
>> I was able to get elixir to work with cerl, such as elixir -e "IO.puts
>> :ok". But I could not get it to work in the release environment running in
>> docker. I get this error:
>>
>> root:~# releases/0.1.0/elixir -e "IO.puts :ok"
>> {"init terminating in
>> do_boot",{undef,[{elixir,start_cli,[],[]},{init,start_em,1,[]},{init,do_boot,3,[]}]}}
>> init terminating in do_boot
>> ({undef,[{elixir,start_cli,[],[]},{init,start_em,1,[]},{init,do_boot,3,[]}]})
>>
>> Crash dump is being written to: erl_crash.dump...done
>>
>> In my dockerfile I replace the elixir bin with my elixir debug like so:
>>
>> ....
>> COPY --from=build /app/_build/prod/rel/app ./
>> # Copy erlang source, along with erlang debug binary
>> COPY --from=build /OTP/subdir /OTP/subdir
>> # Symlink erlang debug binary to erts bin dir
>> RUN ln -s /OTP/subdir/bin/cerl
>> /app/releases/0.1.0/../../erts-11.2.2.15/bin/cerl
>> # Replace elixir script with our scrip that runs the erlang debug binary
>> COPY elixir-debug releases/0.1.0/elixir
>> RUN chmod +x releases/0.1.0/elixir
>> ...
>>
>> The source image for my app docker file
>> is hexpm/elixir:1.10.4-erlang-23.3.4.16-ubuntu-bionic-20210930 but modified
>> to keep the erlang source code and build cerl debug vm.
>>
>> I don't think I can reasonably share a minimal app that reproduces the
>> issue (without sharing my app code which I cannot). The seg fault happens
>> randomly after x hours and I do not know what is causing it.
>>
>> Attached is my modified elixir bin.
>>
>>
>> On Monday, August 22, 2022 at 9:14:52 AM UTC-7 José Valim wrote:
>>
>>> Or perhaps please provide a minimal app that reproduces it. :)
>>>
>>> On Mon, Aug 22, 2022 at 6:13 PM José Valim <jose....@dashbit.co> wrote:
>>>
>>>> Running Elixir with cerl should just work. Can you expand on the
>>>> on_boot errors you get in a release?
>>>>
>>>> On Mon, Aug 22, 2022 at 5:46 PM Stephen Baldwin <
>>>> stephen...@syncromsp.com> wrote:
>>>>
>>>>> Hello I've been trying to debug a seg fault in my elixir app for a
>>>>> bit. I've learned that if debugging symbols are enabled on the erlang vm
>>>>> you can use gdb to debug a linux core file to deduce where the seg fault
>>>>> is
>>>>> occuring. Now I've rebuilt erlang from source to have the debugging
>>>>> symbols
>>>>> and that all works fine, but using it with an elixir release seems to be
>>>>> a
>>>>> bit difficult.
>>>>>
>>>>> I modified the elixir bin similar to
>>>>> https://github.com/elixir-lang/elixir/pull/11082 but I am getting
>>>>> on_boot errors when running the release. So replacing cerl with erl isn't
>>>>> a
>>>>> path to success.
>>>>>
>>>>> I need some help as I don't fully understand the path from an elixir
>>>>> release to the erlang vm. Any quick ways to get this to work? Otherwise I
>>>>> think it would be worthwhile to have an option when building an elixir
>>>>> release to use a cerl vm (debug, valgrind, etc).
>>>>>
>>>>> Regards,
>>>>> Stephen
>>>>>
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>>>>> .
>>>>>
>>>>
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