andygrove opened a new issue, #3499:
URL: https://github.com/apache/datafusion-comet/issues/3499
## Summary
The Miri CI workflow is failing on all branches since `nightly-2026-02-12`
with:
```
error: failed to run custom build command for `quote v1.0.44`
Caused by:
process didn't exit successfully: `.../cargo-miri runner
.../build-script-build` (exit status: 1)
--- stderr
fatal error: file ".../build-script-build" contains outdated or invalid
JSON; try `cargo clean`
```
## Root Cause
This is a confirmed upstream regression in cargo, **not** an issue with our
code.
- **Cause**:
[rust-lang/cargo#16599](https://github.com/rust-lang/cargo/pull/16599) ("Add
`host.runner` for wrapping host build target executions") was included in the
cargo submodule update
[rust-lang/rust#152240](https://github.com/rust-lang/rust/pull/152240) that
shipped with `nightly-2026-02-12`. It accidentally applies `host.runner` to
build script executions even when `host-config` is not enabled, causing
`cargo-miri` to misinterpret build script binaries as JSON metadata.
- **Upstream tracking**:
[rust-lang/miri#4855](https://github.com/rust-lang/miri/issues/4855) (filed by
dtolnay)
- **Fix**:
[rust-lang/cargo#16631](https://github.com/rust-lang/cargo/pull/16631) is
already merged in cargo. It will ship once the cargo submodule is updated in
rust-lang/rust and a new nightly is published.
## Evidence
| Run | Nightly | Result |
|-----|---------|--------|
|
[21918971946](https://github.com/apache/datafusion-comet/actions/runs/21918971946)
| `nightly-2026-02-11` (9e79395f9) | Passed build |
|
[21929153302](https://github.com/apache/datafusion-comet/actions/runs/21929153302)
| `nightly-2026-02-12` (7057231bd) | Failed with JSON error |
|
[21928770209](https://github.com/apache/datafusion-comet/actions/runs/21928770209)
| `nightly-2026-02-12` (7057231bd) | Failed with JSON error |
## Proposed Fix
Pin the nightly version in `.github/workflows/miri.yml` to
`nightly-2026-02-11` until the upstream fix ships in a new nightly:
```diff
- name: Install Miri
run: |
- rustup toolchain install nightly --component miri
- rustup override set nightly
+ rustup toolchain install nightly-2026-02-11 --component miri
+ rustup override set nightly-2026-02-11
cargo miri setup
```
Once a fixed nightly is available, we should unpin back to `nightly`.
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