From: Robert Haas <rhaas@postgresql.org>
Date: Thu, 23 Sep 2021 15:36:53 +0000 (-0400)
Subject: lock the buffer
X-Git-Url: http://git.postgresql.org/gitweb/static/gitweb.js?a=commitdiff_plain;h=477ec606b2af3127a00d01a104d13c8163c9bdcb;p=users%2Frhaas%2Fpostgres.git

lock the buffer
---

diff --git a/src/backend/access/conveyor/conveyor.c b/src/backend/access/conveyor/conveyor.c
index c8200083a0..5e50e64754 100644
--- a/src/backend/access/conveyor/conveyor.c
+++ b/src/backend/access/conveyor/conveyor.c
@@ -422,8 +422,11 @@ ConveyorBeltGetNewPage(ConveyorBelt *cb, CBPageNo *pageno)
 								errmsg_internal("next block should be %u but relation has only %u blocks",
 												next_blkno, nblocks));
 				else if (next_blkno == nblocks)
+				{
 					buffer = ReadBufferExtended(cb->cb_rel, cb->cb_fork,
 												P_NEW, RBM_NORMAL, NULL);
+					LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
+				}
 				UnlockRelationForExtension(cb->cb_rel, ExclusiveLock);
 			}