eth/downloader: fix possible data race by inconsistent field protection #20690
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Fixed inconsistency and also potential data race in eth/downloader/queue.go:
e.g. In eth/downloader/queue.go:
q.receiptPendPoolis read/written 10 times; 9 out of 10 times it is protected by q.lock.Lock(); 1 out of 10 times it is read without a Lock, which is in func CancelReceipts() on L579.A data race may happen when
CancelReceipts()and other func likeRevoke()are called in parallel.The fix is to move lock from func
cancel()to its callerCancelReceipts().The other bugs and fixes are similar.
Note that there is an FP for eth/downloader/peer.go in PR 20650. I remove the changes in peer.go and start a new PR here.