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quest(m1): plan fuzz crypto, richer sim workloads, and a relay drill flake - #5785
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WalkthroughThe pull request adds documentation for proposed QUIC fuzzing and simulation coverage, and for investigating an intermittent subscription abort during an impaired relay-burst drill. It does not change implementation code. Priority: ⬇️ Low Merge Risk: 🔵 Low · up to
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The title clearly and concisely summarizes the three main planned changes: fuzz crypto, richer simulation workloads, and the relay drill flake. |
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| - **Resets**: RESET_STREAM and RESET_STREAM_AT mid-transfer. The reader | ||
| gets exactly the bytes up to the reliable size (none for RESET_STREAM), | ||
| then the reset code, and stream and connection credit come back. |
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When a plain RESET_STREAM occurs mid-transfer after the receiver has consumed some data, those bytes cannot be retracted; the absent reliable size means that no additional prefix is guaranteed, not that the reader must have received zero bytes in total. The current invariant would therefore reject valid seeds based on packet and read scheduling. Track the prefix consumed before the reset for plain resets, while requiring an exact reliable prefix only for RESET_STREAM_AT.
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Agreed. ec9de84 lets a plain RESET_STREAM end after any unmodified prefix, since bytes already read stay read, and requires at least the reliable size only for RESET_STREAM_AT.
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| - **Datagrams** interleaved with streams: each arrives at most once and | ||
| unmodified, and datagrams never stall stream progress. |
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The proposed invariant permits every datagram to disappear, because zero deliveries satisfy both “at most once” and “unmodified.” Consequently, a regression that drops all datagrams before transmission or reception would still pass all 64 cases while stream progress continues. Include lossless cases where every accepted datagram must arrive exactly once, while retaining the weaker invariant for cases with packet loss.
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Agreed. 238c2f4 adds lossless cases, with buffers sized for the workload, where every datagram must arrive, so a regression that drops them all fails. The at-most-once, unmodified invariant still covers the lossy cases.
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| ## Required | ||
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| - [Benchmarks](/quest/m1/quic/coverage/bench.md) - lands the no-op protection this replaces |
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Because Required gates starting, this quest can begin as soon as the benchmark lands, but the connection target it must switch is introduced separately by fuzz.md and does not currently exist under rs/moq-quic. Add the fuzzing quest as a prerequisite (or reverse the dependency and integrate the crypto there), otherwise this quest cannot complete within its stated scope when scheduled.
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| - The `connection` target switches to it, so injected and mutated packets | ||
| decrypt instead of being dropped at the AEAD. Today it runs about 64 | ||
| inputs/s, almost all spent in the handshake. |
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When a mutated inbound packet happens to encode a valid STREAM frame, the new no-op AEAD will admit bytes that were not written through the connected Pair. The planned connection target in quest/m1/quic/coverage/fuzz.md still asserts that all delivered bytes match what was written, so such a valid fuzz input will be minimized as a regression even though the transport behaved correctly. Split raw-packet operations from that byte-integrity oracle, or account for successfully injected frames, before switching the target to this crypto.
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Agreed. cf8b3cd scopes the delivered-bytes check to streams no injected frame touched, once injected packets decrypt; the no-panic check still covers every input.
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Merging. Codex review findings addressed on this head (cf8b3cd), then a clean Codex pass and green CI:
Quest-only change: no code, public API, or wire impact. (Written by Claude Opus 5.5) |
# Conflicts: # quest/m1/test-flakes-2/README.md
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| - A decrypted injected packet can carry a valid STREAM frame, so the | ||
| target's delivered-bytes-match-written check excludes the streams injected | ||
| frames touch; no-panic still covers every input. |
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When the no-op protection admits an injected packet containing a valid DATAGRAM frame, Event::DatagramReceived still passes its payload unconditionally to check_datagram (rs/moq-quic/src/fuzz/connection.rs:415-420,762-774), which requires the harness's eight-byte sequence number and a matching datagrams_sent entry. A valid short or unknown injected datagram therefore panics and is minimized as a false regression. Extend the accounting or exclusion to DATAGRAM frames, including corrupted queued datagrams, rather than only streams.
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Agreed. 6dceb40 widens the exclusion to DATAGRAM frames and to corrupted as well as injected packets: both the stream-bytes check and check_datagram skip what those packets touch, and no-panic still covers every input.
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# Conflicts: # quest/m1/quic/coverage/README.md
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| - **Migration**: NAT rebinding and active migration mid-workload. The | ||
| connection survives and every delivery invariant still holds. |
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When migration changes an endpoint address while an accepted DATAGRAM is queued or in flight, Pair::drive_server discards packets whose destination is the old address (rs/moq-quic/src/tests/util.rs:177-200), and QUIC DATAGRAMs are unreliable and are not retransmitted. Thus even a lossless-link migration case can legitimately miss that datagram, while “every delivery invariant” applies the exact-delivery assertion from the previous bullet and turns a valid migration into a failing seed. Either quiesce datagrams before rebinding or exempt migration-transition datagrams from the exact-delivery oracle.
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Review comments at @quest/m1/quic/coverage/fuzz-crypto.md:
- Line 26: Update the feature-boundary statement in the fuzz-crypto
documentation to clarify that test builds with a rustls provider can name the
module without the fuzz feature, while other builds require fuzz.
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quest/m1/quic/coverage/README.mdquest/m1/quic/coverage/fuzz-crypto.mdquest/m1/quic/coverage/sim-workloads.mdquest/m1/test-flakes-2/README.mdquest/m1/test-flakes-2/relay-burst-impaired.md
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# Conflicts: # quest/m1/quic/coverage/README.md
Summary
Three follow-ups from the moq-quic regression-net epic (
quest/m1/quic/coverage/) and CI:fuzz-crypto.md[S]: a fuzz-only plaintext crypto session in the hiddenfuzzmodule, so theconnectiontarget (about 64 inputs/s today, almost all TLS) skips the handshake and its injected packets decrypt. The benchmarks reuse it instead of a bench-local copy. Once injected packets decrypt, the target's stream and datagram integrity checks exclude what injected or corrupted packets touch. Ready: the fuzzing (test(quic): fuzz moq-quic like moq-net #5779) and benchmark (bench(quic): Criterion sweeps of streams, receive, routing, and wire #5812) quests it waited on have landed.sim-workloads.md[M]: the seeded simulation's random workloads add resets (RESET_STREAM and RESET_STREAM_AT), stops, bidi streams, datagrams, and migration, each with its own invariant. A plain reset may end after any unmodified prefix; RESET_STREAM_AT guarantees at least the reliable size. STOP_SENDING is checked on the sender. Lossless cases must deliver every datagram. Ready: the seeded simulation it extends landed in test(quic): seeded, impaired simulation in Pair, BBR3 by default, and property tests #5780.quest/m1/test-flakes-2/relay-burst-impaired.md[S]: the moq-relay drillbursts_cross_a_transport_peer::impairedaborted its subscription with "internal error" on build(rs): addjust rs coverageand a nightly moq-quic report #5772's io_uring job and passed on rerun; reproduce and fix at the cause.Raised by #5779 (fuzz), #5780 (seeded simulation), and #5772's CI. No code, public API, or wire impact.
Decisions
Fuzz follow-ups to plan (multi-select)
Fuzz crypto goal
Fuzz crypto location
Fuzz crypto placement
Sim follow-ups to plan (multi-select)
Sim workload ops (multi-select)
Sim workloads placement
Sim workloads size
Relay drill flake
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