From 39b8cc991fe31ee8df8b0fee467bbd9800fcc1c5 Mon Sep 17 00:00:00 2001
From: Fujii Masao <fujii@postgresql.org>
Date: Sat, 4 Feb 2017 03:18:13 +0900
Subject: [PATCH] Be sure to release LogicalRepLauncherLock in DROP
 SUBSCRIPTION command.

Previously DROP SUBSCRIPTION command forgot to release the lock at all.

Original patches by Kyotaro Horiguchi and Michael Paquier,
but I didn't use them.
Discussion: http://postgr.es/m/20170201.173623.66249355.horiguchi.kyotaro@lab.ntt.co.jp
---
 src/backend/commands/subscriptioncmds.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/backend/commands/subscriptioncmds.c b/src/backend/commands/subscriptioncmds.c
index 3b708075653..4353e14e1bd 100644
--- a/src/backend/commands/subscriptioncmds.c
+++ b/src/backend/commands/subscriptioncmds.c
@@ -514,6 +514,8 @@ DropSubscription(DropSubscriptionStmt *stmt)
 	/* Kill the apply worker so that the slot becomes accessible. */
 	logicalrep_worker_stop(subid);
 
+	LWLockRelease(LogicalRepLauncherLock);
+
 	/* Remove the origin tracking if exists. */
 	snprintf(originname, sizeof(originname), "pg_%u", subid);
 	originid = replorigin_by_name(originname, true);
-- 
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