From 8426c7411bcd1c3efec6a65db98266b0cad5f62a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marko=20M=C3=A4kel=C3=A4?= <marko.makela@mariadb.com>
Date: Wed, 2 Jun 2021 08:48:09 +0300
Subject: [PATCH] MDEV-23399 fixup for MDEV-10814

buf_madvise_do_dump(): Fix a mutex release that was broken in
commit 7cffb5f6e8a231a041152447be8980ce35d2c9b8.
This function is not covered by any tests. Its only purpose is
to be called from a debugger so that buffers that would normally
be excluded from core dumps ever since
commit b600f30786816e33c1706dd36cdabf21034dc781
can be included.
---
 storage/innobase/buf/buf0buf.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/storage/innobase/buf/buf0buf.cc b/storage/innobase/buf/buf0buf.cc
index 4b0e1edd6c9..72f44ab9c32 100644
--- a/storage/innobase/buf/buf0buf.cc
+++ b/storage/innobase/buf/buf0buf.cc
@@ -1021,7 +1021,7 @@ buf_madvise_do_dump()
 		ret+= madvise(chunk->mem, chunk->mem_size(), MADV_DODUMP);
 	}
 
-	mysql_mutex_lock(&buf_pool.mutex);
+	mysql_mutex_unlock(&buf_pool.mutex);
 	return ret;
 }
 #endif