Index: head/devel/libgtop/files/patch-sysdeps_freebsd_procmap.c
===================================================================
--- head/devel/libgtop/files/patch-sysdeps_freebsd_procmap.c	(revision 522970)
+++ head/devel/libgtop/files/patch-sysdeps_freebsd_procmap.c	(revision 522971)
@@ -1,124 +1,131 @@
---- sysdeps/freebsd/procmap.c.orig	2017-08-07 18:43:41.000000000 -0400
-+++ sysdeps/freebsd/procmap.c	2019-12-26 16:37:29.791528000 -0500
+--- sysdeps/freebsd/procmap.c.orig	2017-08-07 22:43:41 UTC
++++ sysdeps/freebsd/procmap.c
 @@ -52,6 +52,8 @@
  #include <sys/mount.h>
  #include <ufs/ufs/quota.h>
  #include <ufs/ufs/inode.h>
 +#include <ufs/ufs/extattr.h>
 +#include <ufs/ufs/ufsmount.h>
  #include <fs/devfs/devfs.h>
  #if (__FreeBSD_version >= 600006) || defined(__FreeBSD_kernel__)
  #include <fs/devfs/devfs_int.h>
-@@ -95,6 +97,8 @@
+@@ -95,12 +97,14 @@ _glibtop_sysdeps_freebsd_dev_inode (glibtop *server, s
          struct cdev_priv priv;
  #if __FreeBSD_version < 800039
          struct cdev si;
 +#else
 +        struct ufsmount um;
  #endif
  
          *inum = 0;
-@@ -231,6 +235,32 @@
+         *dev = 0;
+ 
+-        if (kvm_read (server->machine->kd, (gulong) &vnode->v_tag,
++        if (kvm_read (server->machine->kd, (gulong) &vnode->v_lock.lock_object.lo_name,
+  	             (char *) &tagptr, sizeof (tagptr)) != sizeof (tagptr) ||
+             kvm_read (server->machine->kd, (gulong) tagptr,
+ 		     (char *) tagstr, sizeof (tagstr)) != sizeof (tagstr))
+@@ -231,6 +235,32 @@ _glibtop_init_proc_map_p (glibtop *server)
          server->sysdeps.proc_map = _glibtop_sysdeps_proc_map;
  }
  
 +static int
 +vm_map_reader(void *token, vm_map_entry_t addr, vm_map_entry_t dest)
 +{
 +	kvm_t *kd;
 +
 +	kd = (kvm_t *)token;
 +	return (kvm_read (kd, (gulong) addr, dest, sizeof(*dest)) == sizeof(*dest));
 +}
 +
 +#if (__FreeBSD_version < 1300062)
 +typedef int vm_map_entry_reader(void *token, vm_map_entry_t addr,
 +    vm_map_entry_t dest);
 +
 +static inline vm_map_entry_t
 +vm_map_entry_read_succ(void *token, struct vm_map_entry *const clone,
 +     vm_map_entry_reader reader)
 +{
 +	vm_map_entry_t next;
 +
 +	next = clone->next;
 +	if (!reader (token, next, clone))
 +		return (NULL);
 +	return (next);
 +}
 +#endif
 +
  /* Provides detailed information about a process. */
  
  glibtop_map_entry *
-@@ -238,13 +268,12 @@
+@@ -238,13 +268,12 @@ glibtop_get_proc_map_p (glibtop *server, glibtop_proc_
                          pid_t pid)
  {
          struct kinfo_proc *pinfo;
 -        struct vm_map_entry entry, *first;
 +        struct vm_map_entry entry;
          struct vmspace vmspace;
          struct vm_object object;
          GArray *maps;
          struct vnode vnode;
 -        int count;
 -        int update = 0;
 +        int i, count;
  
          memset (buf, 0, sizeof (glibtop_proc_map));
  
-@@ -273,16 +302,6 @@
+@@ -273,16 +302,6 @@ glibtop_get_proc_map_p (glibtop *server, glibtop_proc_
                  return NULL;
          }
  
 -        first = vmspace.vm_map.header.next;
 -
 -        if (kvm_read (server->machine->kd,
 -                        (gulong) vmspace.vm_map.header.next,
 -                        (char *) &entry, sizeof (entry)) != sizeof (entry)) {
 -                glibtop_warn_io_r (server, "kvm_read (entry)");
 -		glibtop_suid_leave (server);
 -                return NULL;
 -        }
 -
          /* Walk through the `vm_map_entry' list ... */
  
          /* I tested this a few times with `mmap'; as soon as you write
-@@ -292,21 +311,17 @@
+@@ -292,21 +311,17 @@ glibtop_get_proc_map_p (glibtop *server, glibtop_proc_
          maps = g_array_sized_new(FALSE, FALSE, sizeof(glibtop_map_entry),
                                   vmspace.vm_map.nentries);
  
 -        do {
 +	entry = vmspace.vm_map.header;
 +        for (i = 0; i < vmspace.vm_map.nentries; i++) {
                  glibtop_map_entry *mentry;
                  guint64 inum, dev;
                  guint len;
  
 -                if (update) {
 -                        if (kvm_read (server->machine->kd,
 -                                        (gulong) entry.next,
 -                                        (char *) &entry, sizeof (entry)) != sizeof (entry)) {
 -                                glibtop_warn_io_r (server, "kvm_read (entry)");
 -                                continue;
 -                        }
 -                } else {
 -                        update = 1;
 -                }
 +		if (!vm_map_entry_read_succ(server->machine->kd, &entry, vm_map_reader)) {
 +			glibtop_warn_io_r (server, "kvm_read (entry)");
 +			glibtop_suid_leave (server);
 +			return NULL;
 +		}
  
                  if (entry.eflags & (MAP_ENTRY_IS_SUB_MAP))
                          continue;
-@@ -377,7 +392,7 @@
+@@ -377,7 +392,7 @@ glibtop_get_proc_map_p (glibtop *server, glibtop_proc_
                  if (entry.protection & VM_PROT_EXECUTE)
                          mentry->perm |= GLIBTOP_MAP_PERM_EXECUTE;
  
 -        } while (entry.next != first);
 +        }
  
          glibtop_suid_leave (server);