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Subject: bug#61284: [rust] Segfault when trying to download dependencies using Cargo
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# Segfault when trying to build Rust binary using cargo and a dependency

## Description

As soon as I add a dependency to `Cargo.toml` I get a segfault when I in so=
me way try to build the binary.

## Expected behavior

When running `cargo build` after having added a dependency on `rand =3D "0.=
8.3"` in the example below Cargo should download the `rand` package (`rust-=
rand` in Guix).

## Actual behavior

The build process halts with a segmentation fault.

### Steps to reproduce

Create an environment with the command `guix shell --manifest=3Dmanifest.sc=
m` and there `manifest.scm` contains

```
(specifications->manifest (list "rust"
                                "rust-analyzer"
                                "rust-cargo"))
```

and then run the commands

$ cargo new mve
Created binary (application) `mve` package

$ cd mve/

mve $ cargo build
   Compiling mve v0.1.0 (/home/a12l/Long-Term/TRPL/mve)
    Finished dev [unoptimized + debuginfo] target(s) in 0.56s

mve $ echo 'rand =3D "0.8.3"' >> Cargo.toml

mve $ cargo build
    Updating crates.io index
Segmentation fault (core dumped)

## My system

I'm running Guix on a NixOS 22.11 machine, by having added `https://github.=
com/foo-dogsquared/nix-overlay-guix` to my system configuration.

Thanks!
--
Albin Otterh=C3=A4ll

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Subject: bug#61284: Acknowledgement ([rust] Segfault when trying to
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Subject: bug#61284: [rust] Segfault when trying to download dependencies using Cargo
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> 
> mve $ cargo build
>     Updating crates.io index
> Segmentation fault (core dumped)

I am very new to Guix System - just installed it this
morning.

However, I seem to have had the same issue today,
and apparently found a workaroung.

I tried to run it under strace and it indicated that
apparently it segfaults when it tries to find and
parse several git config files, especially
$HOME/.gitconfig .

Found on the web multiple suggestions that these config
files might be faulty - but I could not find any fault
in my file.

Instead, I found a workaround that might help you:

I set the environment variable

export CARGO_NET_GIT_FETCH_WITH_CLI=true

which changes the way in which cargo uses git.
With this, it works for me.

On top of that, I had further errors with cargo 
which might or might not be unrelated, when doing a
"cargo build". There it looks like rust-cargo and
rustc-1.82.0 are somehow out of sync, leading cargo to
query rustc for a profile option which is not supported by
rustc (print-split-debuginfo). Roughly, it is failing
with this error message, which relates to a much older
version:

https://github.com/kbknapp/cargo-outdated/issues/355

But, *both* errors only happen on my new Guix System
installation, not in Guix package manager on top
of Debian 12 with the same rust-cargo version.

I'll make a separate bug tracking entry for that one
(I need to capture the output and check the version
numbers again).

I suspicion I have is that actually one of rustc or
cargo might actually refer to an out-dated version,
causing a mismatch. Perhaps because of an ci glitch.

Perhaps it is informative to check the installed
version with "cargo -vV" ? One important point
is surely to not mix up manually installed binaries
and the Guix-installed ones... but I am still new
and confused by all this.

--

Johannes Nix

Last modified: Sat, 2 Aug 2025 06:30:02 UTC

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