It fails to stop rngd. It just shows warnings when stop rngd such as by:

$ systemctl stop rngd.service

but stalls shutdown untill daemon rngd is killed.

Backport patch to fix the issue.

Upstream-Status: Backport [https://bugzilla.redhat.com/show_bug.cgi?id=1690364#c8]

Signed-off-by: Kai Kang <kai.kang@windriver.com>
---
diff --git a/rngd_jitter.c b/rngd_jitter.c
index 54070ae..7a69bf9 100644
--- a/rngd_jitter.c
+++ b/rngd_jitter.c
@@ -280,7 +280,7 @@ static void *thread_entropy_task(void *data)
 
 		/* Write to pipe */
 		written = 0;
-		while(written != me->buf_sz) {
+		while(me->active && written != me->buf_sz) {
 			message(LOG_DAEMON|LOG_DEBUG, "Writing to pipe\n");
 			ret = write(me->pipe_fd, &tmpbuf[written], me->buf_sz - written);
 			message(LOG_DAEMON|LOG_DEBUG, "DONE Writing to pipe with return %ld\n", ret);