glm-5.3-flash
e3d7f6f3f2
- alkcall requirement 0.10.0 -> 0.10.1 (same-family version-only bump: the adoption-window ordering fix, private fix surface, no type alktty touches); lockfiles updated in both the root and fuzz workspaces - AGENTS.md pin refreshed from the stale 0.9.0 note Verification: cargo test 113 default / 137 all-features (unchanged from the 0.8.0 baseline); fuzz corpus replay 9 green; clippy stable + wasm (-D warnings); fmt; doc; wasm32-unknown-unknown check; publish dry run (43 files)
alktty fuzzing
cargo-fuzz targets for the wire-facing parse surfaces. The design and
operating rules live in docs/plans/fuzzing.md (adopted from alkcall's
docs/research/fuzzing.md); this README is the operational cheat-sheet.
Layout
fuzz_targets/— nightly-onlyfuzz_target!binaries (thin wrappers).shared/— stable-toolchain library holding the invariant logic; the corpus replay tests run here on plaincargo test.corpus/<target>/— committed seeds (regenerate withpython3 fuzz/gen_fuzz_seeds.py).artifacts/— gitignored crash/oom/timeout artifacts + campaign logs.
Targets
| Target | Drives |
|---|---|
chunk_frame |
ChunkReader/ChunkWriter (5-byte chunk codec, ADR-001) |
negotiation_frame |
NegotiationReader/NegotiationWriter + NegotiateRequest + error_response_bytes + the cross-codec peek-disambiguation seam |
control_json |
ControlMessage::from_slice/to_json + signal_from_name |
session_opseq |
the producer session pump (drive_session_pre_negotiated) + a fuzz-local mock backend — the stateful op-sequence target (ADR-004/ADR-005 invariants; the alkcall-bug-class hunt) |
Running a campaign — always detached
Agent sessions must never run fuzzing in the foreground (an OOM in a target can take down the session host; see docs/plans/fuzzing.md §3). Use the detached runner:
fuzz/run-detached.sh chunk_frame
# poll:
tail -n 50 fuzz/artifacts/chunk_frame-*.log
ls fuzz/artifacts/chunk_frame/
pgrep -f "cargo fuzz run chunk_frame"
FUZZ_RUNTIME_SECS=1800 fuzz/run-detached.sh negotiation_frame for a
longer campaign. The runner pins -fork=1 -rss_limit_mb=2048 -malloc_limit_mb=2048 -timeout=25 and detaches via setsid + nohup.
Corpus replay (the standing fuzz gate)
cargo test --manifest-path fuzz/shared/Cargo.toml
Replays every committed seed through the same invariant functions the fuzzer runs, on stable, no nightly needed. Part of the release verification checklist (AGENTS.md).
Toolchain notes
rust-toolchain.toml pins nightly for this subtree only (llvm-tools
required by cargo-fuzz); the crate itself stays on stable at MSRV 1.88.
cargo fuzz build must be run with the fuzz dir as CWD or trust the
toolchain file (rustup resolves per directory).
Run campaigns before releases and after touching src/wire.rs,
src/negotiation.rs, src/control.rs, the adapter, or the session pump.
session_opseq notes
The op-sequence target is inherently slower than the byte-format targets
(each input drives a full tokio session with bounded reads and yields —
tens of exec/s per worker, not millions). That is expected: the value is
state-space exploration, not throughput. It uses tokio::time::timeout
internally, so the nightly target needs the --features time tokio
surface already present via the shared crate's deps — no extra flags.
Its invariants (kill-on-Drop, exit-chunk-is-last, sentinel/FIFO
semantics) are the ones unit tests assert individually; the fuzzer
explores interleavings no example test can enumerate.