tmjoen

tmjoen

Building Elixir/Erlang linux/amd64 application image on Apple Silicon

I have a multi stage docker file and building the node assets works fine with both --platform linux/arm64 and linux/amd64. I can make the elixir/erlang image work with --platform linux/arm64, but when I try linux/amd64 qemu blows up:

FROM --platform=linux/amd64 hexpm/elixir:1.12.3-erlang-24.1.5-ubuntu-focal-20210325 AS deps

ARG MIX_ENV=prod
ARG HEX_MIRROR_URL=https://repo.hex.pm

RUN /usr/local/bin/mix local.hex --force && \
    /usr/local/bin/mix local.rebar --force

RUN apt-get -qq update && apt-get install -y \
    git \
    unzip \
    build-essential \
    wget \
    sudo

WORKDIR /opt/app

COPY config/ ./config
COPY mix.exs mix.lock /opt/app/

RUN mix deps.get --only $MIX_ENV

Results in

#12 [2/6] RUN /usr/local/bin/mix local.hex --force &&     /usr/local/bin/mix local.rebar --force
#12 sha256:690d11d4149aae5005ba9d4f6d1bfcb55259a6efa519068eac1913c8c5c6a1a1
#12 1.540 qemu: uncaught target signal 11 (Segmentation fault) - core dumped
#12 1.546 Segmentation fault
#12 ERROR: executor failed running [/bin/sh -c /usr/local/bin/mix local.hex --force &&     /usr/local/bin/mix local.rebar --force]: exit code: 139

Anyone else getting this problem? Or found a way around it?

Thanks for reading!

Marked As Solved

dom

dom

The crash happens when JIT is enabled. Disabling the JIT, using pre-JIT Erlang (23.x or older), or using an old OS that doesn’t have a version of gcc recent enough to support C++17 (required to compile the JIT) will work around it.

Also Liked

tmjoen

tmjoen

Some more digging here. It’s not OTP24 that fails, it is OTP24 on some distros:

OTP24 on Ubuntu Focal FAILS (hexpm/elixir:1.13.0-rc.1-erlang-24.1.5-ubuntu-focal-20210325)
OTP24 on Ubuntu Bionic FAILS (hexpm/elixir:1.13.0-rc.1-erlang-24.1.5-ubuntu-bionic-20210325)
OTP24 on Ubuntu Xenial WORKS (hexpm/elixir:1.13.0-rc.1-erlang-24.1.5-ubuntu-xenial-20210114)
OTP24 on Debian Stretch WORKS (hexpm/elixir:1.13.0-rc.1-erlang-24.1.5-debian-stretch-20210902)
OTP24 on Debian Bullseye FAILS (hexpm/elixir:1.13.0-rc.1-erlang-24.1.5-debian-bullseye-20210902)
OTP24 on Alpine 3.14.2 FAILS (hexpm/elixir:1.13.0-rc.1-erlang-24.1.5-alpine-3.14.2)

tmjoen

tmjoen

Not really.

I raised an issue on the docker for mac github, but it was closed and deferred to qemu.

There is a new qemu version out, but it hasn’t been picked up by docker yet (afaict)

jhogberg

jhogberg

Erlang Core Team

This is due to a bug in qemu, see Erlang/OTP 25 JIT on AArch64 fails in user mode emulation (#1034) · Issues · QEMU / QEMU · GitLab.

Older images most likely work because they don’t provide a C++ compiler capable of compiling the JIT, making it fall back to the interpreter.

dom

dom

I wish I knew! I also have that problem and I don’t know how to debug it :sweat_smile:

Klohto

Klohto

It’s been handled poorly. Hopefully this time the issue might stay open so at least we learn where the culprit is or how to work around it Yet Another QEMU Segmentation Fault Issue · Issue #6261 · docker/for-mac · GitHub

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