github-actions[bot] opened a new issue, #2625: URL: https://github.com/apache/iceberg-rust/issues/2625
> Missing `Sync` bound on `PyCFunction::new_closure` closures | Details | | | ------------------- | ---------------------------------------------- | | Package | `pyo3` | | Version | `0.28.3` | | URL | [https://github.com/PyO3/pyo3/pull/6096](https://github.com/PyO3/pyo3/pull/6096) | | Date | 2026-06-11 | | Patched versions | `>=0.29.0` | `PyCFunction::new_closure` (and the temporary `new_closure_bound` complement in the 0.21–0.22 series) required the supplied closure to be `Send + 'static` but not `Sync`. The resulting `PyCFunction` is a Python callable that can be invoked from any Python thread, which means the closure may be called concurrently from multiple threads, and needs a `Sync` bound to prevent possible data races. The problem exists under all Python versions but is particularly vulnerable under the newer free-threaded Python variant, which do not have serial execution imposed by the Global Interpreter Lock. Under releases protected by the GIL, the ability to "detach" from the Python interpreter temporarily inside the closure (e.g. by `Python::detach`) makes it possible for interleaved and/or concurrent execution of various portions of the closure. PyO3 0.29.0 added a `Sync` bound to close this thread-safety bug. See [advisory page](https://rustsec.org/advisories/RUSTSEC-2026-0177.html) for additional details. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
