Molecule AI Dev Engineer B (MiniMax)
b903926afe
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The TestRecoverPanic_RecoversFromPanicInGoroutine test had a
concurrent read/write on a shared bytes.Buffer that the -race
detector flagged intermittently on the repo-wide `go test -race`
step (advisory, non-blocking — but reds the -race lane on every Go
PR).
Two compounding root causes:
1. WRONG LIFO DEFER ORDER. The defer block was:
defer recoverPanic("test_goroutine")
defer close(done)
LIFO runs close(done) FIRST, then recoverPanic — meaning the
test's <-done unblock happens BEFORE recoverPanic's log.Printf
writes to the buffer. The test then reads buf.String() while
the goroutine is still writing. The test comment explicitly
described the correct order ("any defer close(done) placed
BEFORE the recoverPanic defer fires") but the code didn't
match the comment. Fix: swap the defer order so close(done) is
registered first, recoverPanic last — LIFO now runs the log
write first, then signals done.
2. NO CROSS-GOROUTINE SYNCHRONIZATION ON THE BUFFER. The standard
log package holds its own internal mutex around calls to
io.Writer.Write, but that mutex only serializes concurrent
WRITERS — it does NOT synchronize with the test's
buf.String() READ from a separate goroutine. Even with the
LIFO fix, the race detector needs an explicit happens-before
edge between the Write and the String() read. Fix: wrap
bytes.Buffer in a syncBuffer type with a sync.Mutex guarding
both Write and String. Defense in depth — if a future change
ever moves the defers back to the wrong order, the mutex
still serializes the access.
TestVerifyPanic_NoopOnNormalReturn got the same treatment (same
syncBuffer, same corrected defer order) for uniformity and
future-proofing — its normal-return path is no-op so it didn't
race in practice, but keeping the pattern uniform means a future
test author doesn't have to re-derive the safe pattern.
Test surface: TEST-ONLY change (no production code). go test
./internal/middleware/ passes (no -race in this sandbox — no
gcc/cgo — but the LIFO + mutex combination is race-free by
construction).