f - release the forward_htlc lock in process_pending_htlc_forwards

Author: ViktorTigerstrom

lightning/src/ln/channelmanager.rs

@@ -3098,7 +3098,10 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
 			let mut channel_state_lock = self.channel_state.lock().unwrap();
 			let channel_state = &mut *channel_state_lock;
 
-			for (short_chan_id, mut pending_forwards) in self.forward_htlcs.lock().unwrap().drain() {
+			let mut forward_htlcs = HashMap::new();
+			mem::swap(&mut forward_htlcs, &mut self.forward_htlcs.lock().unwrap().drain().collect());
+
+			for (short_chan_id, mut pending_forwards) in forward_htlcs {
 				if short_chan_id != 0 {
 					let forward_chan_id = match channel_state.short_to_chan_info.get(&short_chan_id) {
 						Some((_cp_id, chan_id)) => chan_id.clone(),