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device: remove QueueInboundElement leak with stopped peers

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This is particularly problematic on mobile,
where there is a fixed number of elements.
If most of them leak, it'll impact performance;
if all of them leak, the device will permanently deadlock.

I have a test that detects element leaks, which is how I found this one.
There are some remaining leaks that I have not yet tracked down,
but this is the most prominent by far.

I will commit the test when it passes reliably.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder 2020-12-22 09:52:53 -08:00 committed by Jason A. Donenfeld
parent a1c265b0c5
commit b5f966ac24
1 changed files with 2 additions and 0 deletions
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2
device/receive.go
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@ -199,6 +199,8 @@ func (device *Device) RoutineReceiveIncoming(IP int, bind conn.Bind) {
if device.addToInboundAndDecryptionQueues(peer.queue.inbound, device.queue.decryption, elem) {
buffer = device.GetMessageBuffer()
}
} else {
device.PutInboundElement(elem)
}
peer.queue.RUnlock()