SIGSEGV with libpq and rust:alpine3.13, but not alpine:3.13

kpcyrd commented 3 years ago

I found a segfault when using postgres on the rust docker images that I can't reproduce with rustc from the official alpine images:

Binary built on alpine:* images (3.13 and edge):

foo_1  | [*] Trying to cause segfault
foo_1  | [+] No segfault! Result is: ERR (but that's ok)

Binary built on rust:alpine3.13 image:

foo_1  | [*] Trying to cause segfault
alpine-pq-repro_foo_1 exited with code 139

The debian based rust container and compiling/running it on Arch Linux works fine.

I have a minimal reproducer, to reproduce it run docker-compose up --build, the required files are:

Dockerfile

#FROM alpine:edge # works
#FROM alpine:3.13 # works
FROM rust:alpine3.13

RUN apk add cargo postgresql-dev
WORKDIR /app
COPY . .
RUN cargo build --release
ENTRYPOINT ["/app/target/release/alpine-pq-sigsegv-repro"]

src/main.rs

use diesel::PgConnection;
use diesel::Connection;

fn main() {
    println!("[*] Trying to cause segfault");
    let r = PgConnection::establish("postgres://postgres:postgres@127.0.0.1/asdf");
    println!("[+] No segfault! Result is: {}", if r.is_ok() { "OK" } else { "ERR (but that's ok)" });
}

Cargo.toml

[package]
name = "alpine-pq-sigsegv-repro"
version = "0.1.0"
authors = ["user"]
edition = "2018"

[dependencies]
diesel = { version = "1.4", features = ["postgres"] }

docker-compose.yml

---
version: "3.9"
services:
  foo:
    build: .

Cargo.lock (optional)

```toml # This file is automatically @generated by Cargo. # It is not intended for manual editing. [[package]] name = "alpine-pq-sigsegv-repro" version = "0.1.0" dependencies = [ "diesel", ] [[package]] name = "bitflags" version = "1.2.1" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693" [[package]] name = "byteorder" version = "1.4.3" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610" [[package]] name = "diesel" version = "1.4.6" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "047bfc4d5c3bd2ef6ca6f981941046113524b9a9f9a7cbdfdd7ff40f58e6f542" dependencies = [ "bitflags", "byteorder", "diesel_derives", "pq-sys", ] [[package]] name = "diesel_derives" version = "1.4.1" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "45f5098f628d02a7a0f68ddba586fb61e80edec3bdc1be3b921f4ceec60858d3" dependencies = [ "proc-macro2", "quote", "syn", ] [[package]] name = "pq-sys" version = "0.4.6" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "6ac25eee5a0582f45a67e837e350d784e7003bd29a5f460796772061ca49ffda" dependencies = [ "vcpkg", ] [[package]] name = "proc-macro2" version = "1.0.27" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "f0d8caf72986c1a598726adc988bb5984792ef84f5ee5aa50209145ee8077038" dependencies = [ "unicode-xid", ] [[package]] name = "quote" version = "1.0.9" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "c3d0b9745dc2debf507c8422de05d7226cc1f0644216dfdfead988f9b1ab32a7" dependencies = [ "proc-macro2", ] [[package]] name = "syn" version = "1.0.72" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "a1e8cdbefb79a9a5a65e0db8b47b723ee907b7c7f8496c76a1770b5c310bab82" dependencies = [ "proc-macro2", "quote", "unicode-xid", ] [[package]] name = "unicode-xid" version = "0.2.2" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3" [[package]] name = "vcpkg" version = "0.2.13" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "025ce40a007e1907e58d5bc1a594def78e5573bb0b1160bc389634e8f12e4faa" ```

sfackler commented 3 years ago

This sounds like https://github.com/rust-lang/compiler-team/issues/422.

kpcyrd commented 3 years ago

Likely, I modified the Dockerfile like this;

FROM rust:alpine3.13
ENV RUSTFLAGS="-C target-feature=-crt-static"

RUN apk add cargo postgresql-dev
WORKDIR /app
COPY . .
RUN cargo build --release
ENTRYPOINT ["/app/target/release/alpine-pq-sigsegv-repro"]

And now it's working;

Recreating alpine-pq-repro_foo_1 ... done
Attaching to alpine-pq-repro_foo_1
foo_1  | [*] Trying to cause segfault
foo_1  | [+] No segfault! Result is: ERR (but that's ok)
alpine-pq-repro_foo_1 exited with code 0
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rust-lang / docker-rust