diff --git a/WHATS_NEW b/WHATS_NEW
index 62395b6f0..84f0f20d9 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,7 @@
 Version 2.02.07 - 
 =================================
+  Add mutex to dmeventd_mirror to avoid concurrent execution.
+  Fix vgreduce --removemissing to return success if VG is already consistent.
   Fix return code if VG specified on command line is not found.
   Fix PV tools to include orphaned PVs in default output again.
   Fixed unaligned access when using clvm.
diff --git a/daemons/dmeventd/plugins/mirror/dmeventd_mirror.c b/daemons/dmeventd/plugins/mirror/dmeventd_mirror.c
index 0d615a5ce..b4623a376 100644
--- a/daemons/dmeventd/plugins/mirror/dmeventd_mirror.c
+++ b/daemons/dmeventd/plugins/mirror/dmeventd_mirror.c
@@ -31,6 +31,8 @@
 #define ME_INSYNC    1
 #define ME_FAILURE   2
 
+static pthread_mutex_t _lock = PTHREAD_MUTEX_INITIALIZER;
+
 /* FIXME: We may need to lock around operations to these */
 static int register_count = 0;
 static struct dm_pool *mem_pool = NULL;
@@ -150,6 +152,10 @@ void process_event(const char *device, enum dm_event_type event)
 	char *target_type = NULL;
 	char *params;
 
+	if (pthread_mutex_trylock(&_lock)) {
+		syslog(LOG_NOTICE, "Another thread is handling an event.  Waiting...");
+		pthread_mutex_lock(&_lock);
+	}
 	/* FIXME Move inside libdevmapper */
 	if (!(dmt = dm_task_create(DM_DEVICE_STATUS))) {
 		syslog(LOG_ERR, "Unable to create dm_task.\n");
@@ -204,6 +210,7 @@ void process_event(const char *device, enum dm_event_type event)
  fail:
 	if (dmt)
 		dm_task_destroy(dmt);
+	pthread_mutex_unlock(&_lock);
 }
 
 int register_device(const char *device)
diff --git a/dmeventd/mirror/dmeventd_mirror.c b/dmeventd/mirror/dmeventd_mirror.c
index 0d615a5ce..b4623a376 100644
--- a/dmeventd/mirror/dmeventd_mirror.c
+++ b/dmeventd/mirror/dmeventd_mirror.c
@@ -31,6 +31,8 @@
 #define ME_INSYNC    1
 #define ME_FAILURE   2
 
+static pthread_mutex_t _lock = PTHREAD_MUTEX_INITIALIZER;
+
 /* FIXME: We may need to lock around operations to these */
 static int register_count = 0;
 static struct dm_pool *mem_pool = NULL;
@@ -150,6 +152,10 @@ void process_event(const char *device, enum dm_event_type event)
 	char *target_type = NULL;
 	char *params;
 
+	if (pthread_mutex_trylock(&_lock)) {
+		syslog(LOG_NOTICE, "Another thread is handling an event.  Waiting...");
+		pthread_mutex_lock(&_lock);
+	}
 	/* FIXME Move inside libdevmapper */
 	if (!(dmt = dm_task_create(DM_DEVICE_STATUS))) {
 		syslog(LOG_ERR, "Unable to create dm_task.\n");
@@ -204,6 +210,7 @@ void process_event(const char *device, enum dm_event_type event)
  fail:
 	if (dmt)
 		dm_task_destroy(dmt);
+	pthread_mutex_unlock(&_lock);
 }
 
 int register_device(const char *device)