Cannot use RUST for ARM Graviton2 Lambda

[Aleksandr-Filichkin]

Hi Everyone,

I'm trying to deploy RUST lambda for ARM lambda. I was able to compile the code for target 'aarch64-unknown-linux-gnu', but during invocation, I see such an error:
/var/task/bootstrap: line 3: 9 Segmentation fault (core dumped) ./app END RequestId: 048e5e8c-538a-4447-b917-b46414c3d377 REPORT RequestId: 048e5e8c-538a-4447-b917-b46414c3d377 Duration: 212.24 ms Billed Duration: 257 ms Memory Size: 256 MB Max Memory Used: 37 MB Init Duration: 44.59 ms XRAY TraceId: 1-616e7dfc-07e7e2237a96edf63c5b43e7 SegmentId: 2d628b5e454f8dee Sampled: true RequestId: 048e5e8c-538a-4447-b917-b46414c3d377 Error: Runtime exited with error: exit status 139Runtime.ExitError

All code you can find here (https://github.com/Aleksandr-Filichkin/aws-lambda-runtimes-performance/blob/arm-lambda/rust-aws-lambda/Dockerfile.arm)

The code works for the non-arm Lambda

[brainstorm]

Hello @Aleksandr-Filichkin, my example code runs fine on ARM64 sans MUSL and it does not segfault, take a peek, happy to guide you through if there's something unclear?:

https://github.com/umccr/s3-rust-noodles-bam

I just use a very thin mod of the provided.al2 official image: https://github.com/umccr/s3-rust-noodles-bam/blob/master/Dockerfile-provided.al2

I was tempted to send you a PR when I saw your benchmarking since I'm interested in seeing the performance of ARM64 Rust lambdas with native vs MUSL static wrapping, but I'm glad to see you are actively tackling it already, keen to see the results :)

/cc @nmoutschen

[simonvandel]

@Aleksandr-Filichkin

The docker image you are using to build the rust code uses glibc 2.28 as seen here https://github.com/docker-library/repo-info/blob/a1ebff8be128ff3af7692c79f98ffb7ece0cec63/repos/rust/local/1.54.md#dpkg-source-package-glibc228-10

But Afaikt Amazon Linux 2 only has 2.26 https://aws.amazon.com/amazon-linux-2/release-notes/

You can try building the rust code in a docker image based directly on Amazon Linux 2, so that you are certain that the Glibc version is compatible. You can get the latest rust compiler using rustup.

[simonvandel]

I just tried RUSTFLAGS='-C target-cpu=neoverse-n1' cross build --release --target aarch64-unknown-linux-gnu which successfully runs on Lambda. This is using the https://github.com/rust-embedded/cross tool build, which internally uses Ubuntu 16.04 (https://github.com/rust-embedded/cross/blob/master/docker/Dockerfile.aarch64-unknown-linux-gnu#L1). This is libc 2.19 - I don't know how many ARM specifc optimizations went into that version - later libc's might be faster.

[brainstorm]

Interesting @simonvandel, thanks for sharing! ... where can I find a list for that target-cpu flag? Crossing fingers so that it supports Apple Silicon (see aws-samples/serverless-rust-demo#2 (comment)).

[simonvandel]

where can I find a list for that target-cpu flag?

See https://doc.rust-lang.org/rustc/codegen-options/index.html#target-cpu

[brainstorm]

Thanks, pretty much any sensible ARM-like cpu on rustc --print target-cpus fails in the same way, I'll continue investigating in briansmith/ring#1332 (comment) and followups.

[coltonweaver]

Hey! Have you given the latest README steps a shot? I was able to compile and run examples on ARM using Docker (on Apple silicon).

[nmoutschen]

Hey @Aleksandr-Filichkin !

I see that you've made changes in your repository, so I will close this issue assuming that you made it work. Feel free to reopen with a status update if it's not the case.