vlx

vlx

[Debug BEAM VM] How can I debug Segmentation fault from 3rd party lib?

Hello,

first a bit of context:

I am using Elixir with Kafka extensively.

Lib for connecting to Kafka I am using is GitHub - silviucpp/erlkaf: Erlang kafka driver based on librdkafka · GitHub

It depends on a well known C++ Kafka driver GitHub - confluentinc/librdkafka: The Apache Kafka C/C++ library · GitHub

librdkafka works great most of the time, but sometimes on startup it throws Segmentation fault errors, and I would like to debug the C++ code.

Question:

Is there a way to compile the BEAM VM with C debug flags and connect it to some C debugger (prob not gdb but something for LLVM, right?)

I am using Mac with i7 Intel proc, installed Erlang and Elixir with asdf.

Tnx in advance,
Vlx

Most Liked

jhogberg

jhogberg

Erlang Core Team

If I’m reading the docs right, asdf uses kerl under the hood, so you should be able to pass kerl options when installing:

$ export KERL_BUILD_DEBUG_VM="true"
$ asdf install erlang <version>

You should then be able to use cerl -debug -lldb to start LLDB with the debug emulator.

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