Index: sys/kern/vfs_bio.c
===================================================================
--- sys/kern/vfs_bio.c
+++ sys/kern/vfs_bio.c
@@ -3609,23 +3609,25 @@
 		size = vp->v_mount->mnt_stat.f_iosize;
 	off = (vm_ooffset_t)blkno * (vm_ooffset_t)vp->v_mount->mnt_stat.f_iosize;
 
-	VM_OBJECT_RLOCK(obj);
 	for (toff = 0; toff < vp->v_mount->mnt_stat.f_iosize; toff += tinc) {
-		m = vm_page_lookup(obj, OFF_TO_IDX(off + toff));
+		m = vm_page_grab_unlocked(obj, OFF_TO_IDX(off + toff),
+		    VM_ALLOC_NORMAL | VM_ALLOC_SBUSY | VM_ALLOC_IGN_SBUSY |
+		    VM_ALLOC_NOCREAT);
 		if (!m)
 			goto notinmem;
 		tinc = size;
 		if (tinc > PAGE_SIZE - ((toff + off) & PAGE_MASK))
 			tinc = PAGE_SIZE - ((toff + off) & PAGE_MASK);
 		if (vm_page_is_valid(m,
-		    (vm_offset_t) ((toff + off) & PAGE_MASK), tinc) == 0)
+		    (vm_offset_t) ((toff + off) & PAGE_MASK), tinc) == 0) {
+			vm_page_sunbusy(m);
 			goto notinmem;
+		}
+		vm_page_sunbusy(m);
 	}
-	VM_OBJECT_RUNLOCK(obj);
 	return 1;
 
 notinmem:
-	VM_OBJECT_RUNLOCK(obj);
 	return (0);
 }