Fix bad order of syscalls causing high CPU usage

Resolves: #2002186

db-5.3.28-mmap-high-cpu-usage.patch

@@ -0,0 +1,19 @@
+Author: Filip Januš <fjanus@redhat.com>
+Date: 6 Sep 2021
+Related: https://bugzilla.redhat.com/show_bug.cgi?id=1992402
+Patch was created based on the discussion in the previous link
+diff -ur db-5.3.28/src/os/os_map.c db_patch/src/os/os_map.c
+--- db-5.3.28/src/os/os_map.c	2013-09-09 17:35:09.000000000 +0200
++++ db_patch/src/os/os_map.c	2021-09-09 07:33:12.027328265 +0200
+@@ -213,7 +213,10 @@
+ 	if (rp->max < rp->size)
+ 		rp->max = rp->size;
+ 	if (ret == 0 && F_ISSET(infop, REGION_CREATE)) {
+-		if (F_ISSET(dbenv, DB_ENV_REGION_INIT))
++
++		rp->size = rp->max;
++
++        if (F_ISSET(dbenv, DB_ENV_REGION_INIT))
+ 			ret = __db_file_write(env, infop->fhp,
+ 			    rp->size / MEGABYTE, rp->size % MEGABYTE, 0x00);
+ 		else

libdb.spec

@@ -5,7 +5,7 @@
 Summary: The Berkeley DB database library for C
 Name: libdb
 Version: 5.3.28
-Release: 51%{?dist}
+Release: 52%{?dist}
 Source0: http://download.oracle.com/berkeley-db/db-%{version}.tar.gz
 Source1: http://download.oracle.com/berkeley-db/db.1.85.tar.gz
 # For mt19937db.c
@@ -58,6 +58,7 @@ Patch39: libdb-5.3.21-trickle_cpu.patch
 Patch40: db-5.3.28_cve-2019-2708.patch
 # Downstream covscan patch
 Patch41: db-5.3.28-fix-CWE-686-398.patch
+Patch42: db-5.3.28-mmap-high-cpu-usage.patch
 
 URL: http://www.oracle.com/database/berkeley-db/
 License: BSD and LGPLv2 and Sleepycat
@@ -229,6 +230,7 @@ popd
 %patch39 -p1
 %patch40 -p1 -b .cve-2019-2708
 %patch41 -p1
+%patch42 -p1
 
 cd dist
 ./s_config
@@ -390,6 +392,11 @@ mv man/* ${RPM_BUILD_ROOT}%{_mandir}/man1
 %{_includedir}/%{name}/dbsql.h
 
 %changelog
+* Mon Sep 13 2021 Filip Januš <fjanus@redhat.com> - 5.3.28-52
+- Bad order of sys calls cause high CPU usage
+- Related: #2002186
+- Patch no. 42 was added
+
 * Mon Aug 09 2021 Mohan Boddu <mboddu@redhat.com> - 5.3.28-51
 - Rebuilt for IMA sigs, glibc 2.34, aarch64 flags
   Related: rhbz#1991688