rpc: tighter shutdown synchronization in client subscription #22597#955
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gzliudan merged 1 commit intoXinFinOrg:dev-upgradefrom Apr 24, 2025
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…#22597 This fixes a rare issue where the client subscription forwarding loop would attempt send on the subscription's channel after Unsubscribe has returned, leading to a panic if the subscription channel was already closed by the user. Example: sub, _ := client.Subscribe(..., channel, ...) sub.Unsubscribe() close(channel) The race occurred because Unsubscribe called quitWithServer to tell the forwarding loop to stop sending on sub.channel, but did not wait for the loop to actually come down. This is fixed by adding an additional channel to track the shutdown, on which Unsubscribe now waits. Fixes ethereum#22322
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benjamin202410
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geth: ethereum#22597
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