Sample
once_cell 1.21.4: Ensure OnceCell::wait under parking_lot feature does not prematurely return uninitialized memory when an initializer panics
Verified sample for cargo once_cell 1.21.4: Ensure OnceCell::wait under parking_lot feature does not prematurely return uninitialized memory when an…
sha256:aa670fbfe7d7615096a4cc1bf4da208ff59177e8e9774a7ce78b2ca5082aa8e9
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
rust linux x64 rust rust cargo
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| rust 1 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-16 |
| rust 1 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-18 |
Case
HOW- Goal
- Ensure OnceCell::wait under parking_lot feature does not prematurely return uninitialized memory when an initializer panics
- Packages
- Symbols
-
- once_cell::sync::OnceCell::wait
- once_cell::sync::OnceCell::get_or_try_init
- once_cell::sync::OnceCell::get_or_init
- Environment
- rust
- Created
- 2026-08-16T08:11:50Z
Contract
- assert OnceCell::wait under parking_lot feature stays parked across a panicking get_or_try_init until a retry succeeds
- assert multiple concurrent OnceCell::wait threads re-park when an initializer unwinds and reliably observe the value once completed
- assert OnceCell::get_or_try_init leaves the cell uninitialized after a panic, allowing subsequent initializers to run
Files
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs