Index: head/sys/fs/pseudofs/pseudofs.c
===================================================================
--- head/sys/fs/pseudofs/pseudofs.c
+++ head/sys/fs/pseudofs/pseudofs.c
@@ -51,7 +51,7 @@
 
 static MALLOC_DEFINE(M_PFSNODES, "pfs_nodes", "pseudofs nodes");
 
-SYSCTL_NODE(_vfs, OID_AUTO, pfs, CTLFLAG_RW, 0,
+SYSCTL_NODE(_vfs, OID_AUTO, pfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
     "pseudofs");
 
 #ifdef PSEUDOFS_TRACE
Index: head/sys/fs/pseudofs/pseudofs_vncache.c
===================================================================
--- head/sys/fs/pseudofs/pseudofs_vncache.c
+++ head/sys/fs/pseudofs/pseudofs_vncache.c
@@ -54,7 +54,7 @@
 static void pfs_exit(void *arg, struct proc *p);
 static void pfs_purge_all(void);
 
-static SYSCTL_NODE(_vfs_pfs, OID_AUTO, vncache, CTLFLAG_RW, 0,
+static SYSCTL_NODE(_vfs_pfs, OID_AUTO, vncache, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
     "pseudofs vnode cache");
 
 static int pfs_vncache_entries;