diff --git a/backport-Default-to-one-thread-if-getaffinity-returns-an-erro.patch b/backport-Default-to-one-thread-if-getaffinity-returns-an-erro.patch
new file mode 100644
index 0000000000000000000000000000000000000000..1cf5f07683104c97a8802cb0576f7c775d954013
--- /dev/null
+++ b/backport-Default-to-one-thread-if-getaffinity-returns-an-erro.patch
@@ -0,0 +1,34 @@
+From d2b4876231ac9c2e26880ebe428bfb41e60e098e Mon Sep 17 00:00:00 2001
+From: Neil Horman <nhorman@tuxdriver.com>
+Date: Wed, 19 Dec 2018 10:10:44 -0500
+Subject: [PATCH] Default to one thread if getaffinity returns an error
+
+Its possible on virt systems, for sched_getaffinity to return an error
+if the vm has cpus, but cgroup placement restricts that set to 0
+physical processors.  In that event, just default to 1 thread on cpu 0
+
+Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
+---
+ rngd_jitter.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/rngd_jitter.c b/rngd_jitter.c
+index 4e4b348..d14a3ba 100644
+--- a/rngd_jitter.c
++++ b/rngd_jitter.c
+@@ -421,7 +421,11 @@ int init_jitter_entropy_source(struct rng *ent_src)
+ 	cpus = CPU_ALLOC(i);
+ 	cpusize = CPU_ALLOC_SIZE(i);
+ 	CPU_ZERO_S(cpusize, cpus);
+-	sched_getaffinity(0, cpusize, cpus);
++	if (sched_getaffinity(0, cpusize, cpus) < 0) {
++		message(LOG_DAEMON|LOG_DEBUG, "Can not determine affinity of process, defaulting to 1 thread\n");
++		CPU_SET(0,cpus);
++	}
++
+ 	num_threads = CPU_COUNT_S(cpusize, cpus);
+ 
+ 	if (num_threads >= ent_src->rng_options[JITTER_OPT_THREADS].int_val)
+-- 
+2.17.2
+
diff --git a/rng-tools.spec b/rng-tools.spec
index 8da8fbfd1b97c288d0a360211030da9f1f46d469..9e29f71de1b4a3470bccb97ec8f3c4ce564252de 100644
--- a/rng-tools.spec
+++ b/rng-tools.spec
@@ -1,6 +1,6 @@
 Name:            rng-tools
 Version:         6.5
-Release:         1
+Release:         2
 Summary:         Random number generator daemon
 License:         GPLv2+
 URL:             https://github.com/nhorman/rng-tools
@@ -9,6 +9,7 @@ Source1:         rngd.service
 Source2:         jitterentropy-library-2.2.0.tar.gz
 
 Patch0:          jitterentropy-remove-install.patch
+Patch1:          backport-Default-to-one-thread-if-getaffinity-returns-an-erro.patch
 
 #Dependency
 BuildRequires:   gcc make gettext systemd autoconf automake
@@ -59,6 +60,9 @@ install -D -t $RPM_BUILD_ROOT%{_unitdir} -m 0644 %{SOURCE1}
 %{_mandir}/man8/rngd.8.*
 
 %changelog
+* Thu Dec 10 2020 yangzhuangzhuang <yangzhuangzhuang1@huawei.com> - 6.5-2
+- fix rngd.service coredump
+
 * Sat Aug 29 2020 Yeqing Peng <pengyeqing@huawei.com> - 6.5-1
 - since 6.6, jitterentropy-library is independed from rng-tools,
   no any entropy source will lead to rng-tools service fail.