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NIF debugging with GDB/Valgrind

#debugging#nif
solanav

solanav

NIF debugging with GDB/Valgrind

Hello there!

I’m currently trying to find a memory leak in a NIF I have written in C.

I have found some resources as to how to run erlang NIFs with valgrind. I already compiled the Erlang VM and I can now run cerl with -valgrind and -gdb.

Are there any resources on Elixir specific NIF debugging that I’m missing? Is there a setup that has worked for you? Any guide, manual, book, video, etc. would be very helpful.

Thanks!

5 comments
#debugging#nif
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Marked As Solved

akash-akya

akash-akya

Last I tried, I had to modify elixir script.

  • update erl path here to use your compiled cerl
  • pass -valgrind flag here
set -- "$ERTS_BIN$ERL_EXEC" -valgrind -pa "$SCRIPT_PATH"/../lib/*/ebin $ELIXIR_ERL_OPTIONS $ERL "$@"
3
Post #6

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garazdawi

garazdawi

Erlang Core Team

Use a debug emulator. Besides that it is just normal C debugging tactics.

3
Post #3
garazdawi

garazdawi

Erlang Core Team

I don’t know how iex works, so you will have to find someone that does.

I would try to look and see what arguments iex passes to erl when it starts and then pass those to cerl instead.

1
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