Index: ./common/linux/linux_work.c
===================================================================
RCS file: /cvsroot/src/sys/external/bsd/common/linux/linux_work.c,v
retrieving revision 1.43
diff -p -u -r1.43 linux_work.c
--- ./common/linux/linux_work.c	27 Aug 2018 15:25:43 -0000	1.43
+++ ./common/linux/linux_work.c	5 Mar 2019 08:27:01 -0000
@@ -111,6 +111,7 @@ SDT_PROBE_DEFINE1(sdt, linux, work, flus
 SDT_PROBE_DEFINE1(sdt, linux, work, flush__done,
     "struct workqueue_struct *"/*wq*/);
 
+static bool workqueue_key_initialized __read_mostly;
 static specificdata_key_t workqueue_key __read_mostly;
 
 struct workqueue_struct	*system_wq __read_mostly;
@@ -124,6 +125,20 @@ atomic_cas_uintptr(volatile uintptr_t *p
 	return (uintptr_t)atomic_cas_ptr(p, (void *)old, (void *)new);
 }
 
+static int
+linux_workqueue_preinit(void)
+{
+	int error;
+
+	if (workqueue_key_initialized)
+		return 0;
+	error = lwp_specific_key_create(&workqueue_key, NULL);
+	if (error)
+		return error;
+	workqueue_key_initialized = true;
+	return 0;
+}
+
 /*
  * linux_workqueue_init()
  *
@@ -135,7 +150,7 @@ linux_workqueue_init(void)
 {
 	int error;
 
-	error = lwp_specific_key_create(&workqueue_key, NULL);
+	error = linux_workqueue_preinit();
 	if (error)
 		goto fail0;
 
@@ -164,6 +179,7 @@ fail4: __unused
 fail3:	destroy_workqueue(system_long_wq);
 fail2:	destroy_workqueue(system_wq);
 fail1:	lwp_specific_key_delete(workqueue_key);
+	workqueue_key_initialized = false;
 fail0:	KASSERT(error);
 	return error;
 }
@@ -181,6 +197,7 @@ linux_workqueue_fini(void)
 	destroy_workqueue(system_long_wq);
 	destroy_workqueue(system_wq);
 	lwp_specific_key_delete(workqueue_key);
+	workqueue_key_initialized = false;
 }
 
 /*
@@ -202,6 +219,10 @@ alloc_ordered_workqueue(const char *name
 
 	KASSERT(flags == 0);
 
+	error = linux_workqueue_preinit();
+	if (__predict_false(error != 0))
+		return NULL;
+
 	wq = kmem_zalloc(sizeof(*wq), KM_SLEEP);
 
 	mutex_init(&wq->wq_lock, MUTEX_DEFAULT, IPL_VM);