Incident Dossier

Socket reused after error

Mid-response errors do not put the connection in a usable state — bytes remain in the receive buffer. The pool returns the socket to the idle list anyway, and the next caller reads those leftover bytes as if they were the new response. The bug only surfaces when an upstream error happens to coincide with another request on the same keep-alive.

Initial failing signalErrored socket with buffered bytes is reusedExpected behavior: an errored socket with buffered data is closed and not handed back · actual behavior: the pool returns the same socket for the next acquire

Progress

1Reproduce the bugRun checks

2Edit the fixOpen

3Pass checksOpen

4Submit fixOpen

Reproduction Steps

Run npm test.
Inspect the failing assertion about an errored socket being returned for reuse.
Trace what reportError does to the socket and what release puts back on the pool.
Mark the socket closed and drain its buffer on error; skip closed sockets on acquire.

Focus Mode

Start

src/socket-pool.js

Likely area

src/socket-pool.js

Challenge Coach

Hints reveal broad direction first, then narrow toward the suspect path without showing hidden tests or exact solution code.

TopicNetwork & Connectivity

DifficultyHard

Est. time25 min

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Evidence Map

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workspace

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