lntest: wait for ChanUpdate req to be fully processed before sending another #9574
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ellemouton
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…another Before this commit, it was possible for a request to be sent on the `chanWatchRequests` channel in `WaitForChannelPolicyUpdate` and then for the `ticker.C` case to select _before_ the `eventChan` select gets triggered when the `topologyWatcher` closes the `eventChan` in its call to `handlePolicyUpdateWatchRequest`. This could lead to a "close of a closed channel" panic. To fix this, this commit ensures that we only move on to the next iteration of the select statement in `WaitForChannelPolicyUpdate` once the request sent on `chanWatchRequests` has been fully handled.
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yyforyongyu
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Mar 5, 2025
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Before this commit, it was possible for a request to be sent on the
chanWatchRequestschannel inWaitForChannelPolicyUpdateand then for theticker.Ccase to select before theeventChanselect gets triggered when thetopologyWatchercloses theeventChanin its call tohandlePolicyUpdateWatchRequest. This could lead to a "close of a closed channel" panic.To fix this, this commit ensures that we only move on to the next iteration of the select statement in
WaitForChannelPolicyUpdateonce the request sent onchanWatchRequestshas been fully handled.See this build for an instance of where this panic was triggered.