diff --git a/sys/fs/pseudofs/pseudofs.h b/sys/fs/pseudofs/pseudofs.h
--- a/sys/fs/pseudofs/pseudofs.h
+++ b/sys/fs/pseudofs/pseudofs.h
@@ -31,6 +31,7 @@
 #ifndef _PSEUDOFS_H_INCLUDED
 #define _PSEUDOFS_H_INCLUDED
 
+#include <sys/_sx.h>
 #include <sys/jail.h>
 
 /*
@@ -189,8 +190,9 @@
  * pfs_info: describes a pseudofs instance
  *
  * The pi_mutex is only used to avoid using the global subr_unit lock
- * for unrhdr.  The rest of struct pfs_info is only modified during
- * vfs_init() and vfs_uninit() of the consumer filesystem.
+ * for unrhdr, and the pi_mountlock is used to coordinate initialization of the
+ * consumer filesystem on first ount.  The rest of struct pfs_info is only
+ * modified during pi_init() and pi_uninit() of the consumer filesystem.
  */
 struct pfs_info {
 	char			 pi_name[PFS_FSNAMELEN];
@@ -198,6 +200,7 @@
 	pfs_init_t		 pi_uninit;
 
 	/* members below this line are initialized at run time */
+	struct sx		 pi_mountlock;
 	struct pfs_node		*pi_root;
 	struct mtx		 pi_mutex;
 	struct unrhdr		*pi_unrhdr;
@@ -249,7 +252,7 @@
 int		 pfs_root	(struct mount *mp, int flags,
 				 struct vnode **vpp);
 int		 pfs_statfs	(struct mount *mp, struct statfs *sbp);
-int		 pfs_init	(struct pfs_info *pi, struct vfsconf *vfc);
+int		 pfs_vfsinit	(struct pfs_info *pi, struct vfsconf *vfc);
 int		 pfs_uninit	(struct pfs_info *pi, struct vfsconf *vfc);
 
 /*
@@ -276,9 +279,9 @@
 #define PSEUDOFS(name, version, flags)					\
 									\
 static struct pfs_info name##_info = {					\
-	#name,								\
-	name##_init,							\
-	name##_uninit,							\
+	.pi_name = #name,						\
+	.pi_init = name##_init,						\
+	.pi_uninit = name##_uninit,					\
 };									\
 									\
 static int								\
@@ -287,8 +290,8 @@
 }									\
 									\
 static int								\
-_##name##_init(struct vfsconf *vfc) {					\
-	return (pfs_init(&name##_info, vfc));				\
+_##name##_vfsinit(struct vfsconf *vfc) {				\
+	return (pfs_vfsinit(&name##_info, vfc));			\
 }									\
 									\
 static int								\
@@ -298,7 +301,7 @@
 									\
 static struct vfsops name##_vfsops = {					\
 	.vfs_cmount =		pfs_cmount,				\
-	.vfs_init =		_##name##_init,				\
+	.vfs_init =		_##name##_vfsinit,			\
 	.vfs_mount =		_##name##_mount,			\
 	.vfs_root =		pfs_root,				\
 	.vfs_statfs =		pfs_statfs,				\
diff --git a/sys/fs/pseudofs/pseudofs.c b/sys/fs/pseudofs/pseudofs.c
--- a/sys/fs/pseudofs/pseudofs.c
+++ b/sys/fs/pseudofs/pseudofs.c
@@ -41,12 +41,15 @@
 #include <sys/mutex.h>
 #include <sys/proc.h>
 #include <sys/sbuf.h>
+#include <sys/sx.h>
 #include <sys/sysctl.h>
 #include <sys/vnode.h>
 
 #include <fs/pseudofs/pseudofs.h>
 #include <fs/pseudofs/pseudofs_internal.h>
 
+static int pfs_init(struct pfs_info *pi, struct vfsconf *vfc);
+
 static MALLOC_DEFINE(M_PFSNODES, "pfs_nodes", "pseudofs nodes");
 
 SYSCTL_NODE(_vfs, OID_AUTO, pfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
@@ -382,10 +385,18 @@
 pfs_mount(struct pfs_info *pi, struct mount *mp)
 {
 	struct statfs *sbp;
+	int error = 0;
 
 	if (mp->mnt_flag & MNT_UPDATE)
 		return (EOPNOTSUPP);
 
+	sx_xlock(&pi->pi_mountlock);
+	if (pi->pi_root == NULL)
+		error = pfs_init(pi, mp->mnt_vfc);
+	sx_xunlock(&pi->pi_mountlock);
+	if (error != 0)
+		return (error);
+
 	MNT_ILOCK(mp);
 	mp->mnt_flag |= MNT_LOCAL;
 	mp->mnt_kern_flag |= MNTK_NOMSYNC;
@@ -454,9 +465,21 @@
 }
 
 /*
- * Initialize a pseudofs instance
+ * Initialize pseudofs synchronization bits.  These will generally be needed
+ * in order to avoid problems with parallel mounting of pseudofs consumers.
  */
 int
+pfs_vfsinit(struct pfs_info *pi, struct vfsconf *vfc)
+{
+
+	sx_init(&pi->pi_mountlock, "pfs mountlock");
+	return (0);
+}
+
+/*
+ * Initialize a pseudofs instance
+ */
+static int
 pfs_init(struct pfs_info *pi, struct vfsconf *vfc)
 {
 	struct pfs_node *root;
@@ -490,15 +513,21 @@
 int
 pfs_uninit(struct pfs_info *pi, struct vfsconf *vfc)
 {
-	int error;
+	if (pi->pi_root != NULL) {
+		int error;
+
+		error = (pi->pi_uninit)(pi, vfc);
+		if (error != 0)
+			return (error);
+
+		pfs_destroy(pi->pi_root);
+		pi->pi_root = NULL;
+		pfs_fileno_uninit(pi);
+	}
 
-	pfs_destroy(pi->pi_root);
-	pi->pi_root = NULL;
-	pfs_fileno_uninit(pi);
 	if (bootverbose)
 		printf("%s unregistered\n", pi->pi_name);
-	error = (pi->pi_uninit)(pi, vfc);
-	return (error);
+	return (0);
 }
 
 /*
diff --git a/sys/modules/pseudofs/Makefile b/sys/modules/pseudofs/Makefile
--- a/sys/modules/pseudofs/Makefile
+++ b/sys/modules/pseudofs/Makefile
@@ -13,7 +13,7 @@
 		pfs_unmount	\
 		pfs_root	\
 		pfs_statfs	\
-		pfs_init	\
+		pfs_vfsinit	\
 		pfs_uninit	\
 		pfs_create_dir	\
 		pfs_create_file	\