Three follow-ups the review caught in the stray-capture rewrite, plus a cost
undercount shared with the log ledger.
Seal the stray fragment list into blocks past MAX_PENDING_CHUNKS, mirroring the
fd-3 reader: a program pacing single-byte os.write(1, ...) calls otherwise
accumulates one live Buffer per write, and the per-object overhead no byte
count sees exhausts the host heap far below the budget.
Flush the residual by its running SERIALIZED cost (serializedBufferCost, a
per-byte lower bound) rather than raw byte count: a control-char-dense
newline-free flood serializes several-fold, so a raw-byte threshold let it grow
to a full budget's worth of raw bytes — up to ~6x what the ledger admits —
before flushStray concat/decoded the whole ~256 MiB residual at once.
Charge a lone surrogate its full six escaped bytes (\uXXXX under ES2019
well-formed JSON.stringify) in both jsonStringCostUpTo and serializedBufferCost,
not the three bytes Buffer.byteLength reports for U+FFFD: a forged log frame
flooding \ud800 escapes was undercharged by half and admitted ~2x maxLogBytes.
Key the sync-spawn leak assertion off the exact bootstrap path from the mocked
spawn's argv, immune to a sibling worker's concurrent staging. Refresh the
stale load-check comment that named the replaced JSON.stringify mechanism.
Add lone-surrogate, stray-sealing, and companion regression tests (per-file
100% coverage); update the Agent Note and zh pair.
The line-aggregating stray capture from the previous round regressed three
ways the review caught. Rewrite it on the fd-3 reader's raw-Buffer-chunk
shape: accumulate chunks with a byte counter and split on the raw 0x0a byte,
so a large newline-free write no longer re-copies the residual and re-scans
from index 0 per chunk (both O(N^2)). Meter each admitted entry by serialized
cost through a new jsonStringCostUpTo that walks to the cap and stops, so a
near-budget control-char-dense line never allocates the sixfold-inflated
JSON.stringify result the old ledger did (the critical: ~1.6 GiB transient
under a large maxLogBytes). Flush the residual explicitly in the closeDeadline
handler before it destroys the streams, so a setsid escapee's path (which
fires no end) does not drop a leader's final newline-free diagnostic.
Harden the sync-spawn leak assertion to a set difference against a pre-run
snapshot, immune to a parallel worker's concurrent tmpdir create/delete.
Decline the round-2 request to enforce the fd-3 ceiling per-frame: the counter
check must precede Buffer.concat to prevent ~2x memory doubling (two
regression tests assert this), and the batch-edge false reject it would fix is
reachable only at a maxLogBytes/maxValueBytes configured within one pipe read
of the 256 MiB ceiling, far past the defaults. Documented at the check and in
the note Alternatives.
Add flood, NUL-flood, short-escape, and closeDeadline-flush regression tests
(restoring per-file 100% coverage); update the Agent Note and zh pair.
Wrap spawn and the fd-3 narrowing so a synchronous throw (ENAMETOOLONG on
an over-PATH_MAX pythonBin, EMFILE) removes the run's staging directory and
resolves the same worker-exit class as the async error event, instead of
rejecting run() and leaking the directory.
Aggregate native stdout/stderr by real newline rather than by Node data
chunk: logs entries are joined with "\n" downstream, so a newline-free
write larger than one pipe read no longer reads back with spurious breaks.
The ledger still bounds a newline-free flood.
Track a running scan offset in both frame readers so a large frame
accumulated across chunks is scanned once, not re-scanned from 0 per chunk.
Reword the deadline hard-bound v8-ignore to state its real environment
dependence (PID-1-doesn't-reap container, zombie survivor) and cross-ref
the note's rejected signal-0 alternative; fix settle comments that quoted
the pre-qualification teardown contract; document the capMessage vs
_cap_message billing split on both sides; guard the dispose-after-resolve
heartbeat assertion against a vacuous 0===0 pass; reuse
_TRUNCATION_MARKER_BYTES; note the abandoned-call pending-entry bound.
Update the Agent Note Decision/Testing/Alternatives/Consequences for the
above and record the confirmed-empty finalize as a second honest
fail-before exception; sync the zh pair.
Land the PythonCodeRuntime implementation on top of the fd-3 protocol
seam: python3 -I per run, binding namespace over fd 3, RLIMIT_CPU/AS,
wall-clock timer, and SIGTERM->grace->SIGKILL process-group teardown,
with the real-subprocess integration suite.
Fixes three defects surfaced on the source PR's review before they ship:
- boot-write failure resolved a worker-exit through finish()/settle()
that read wallTimer/onAbort/live in their TDZ, rejecting run() instead;
the boot write now runs after those bindings and the v8-ignore that hid
the branch is removed.
- log capture serialized against settlement with no lock while model
daemon threads keep writing; LogBuffer now owns one shared re-entrant
lock taken by write/flush_line/push.
- the fd-3 line residual was a subarray view pinning the whole joined
frame; it is copied into a right-sized Buffer via detachResidual so
pendingBytes measures what is retained.
Chinesezjc