D27513.diff
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	Index: head/sys/kern/kern_descrip.c
	===================================================================
	--- head/sys/kern/kern_descrip.c
	+++ head/sys/kern/kern_descrip.c
	@@ -2463,6 +2463,13 @@
	struct file *fp;
	int i, lastfile;

	+ KASSERT(refcount_load(&fdp->fd_refcnt) == 0,
	+ ("%s: fd table %p carries references", __func__, fdp));
	+
	+ /* Serialize with threads iterating over the table. */
	+ FILEDESC_XLOCK(fdp);
	+ FILEDESC_XUNLOCK(fdp);
	+
	lastfile = fdlastfile_single(fdp);
	for (i = 0; i <= lastfile; i++) {
	fde = &fdp->fd_ofiles[i];
	@@ -2536,6 +2543,11 @@
	void
	fdescfree_remapped(struct filedesc *fdp)
	{
	+#ifdef INVARIANTS
	+ /* fdescfree_fds() asserts that fd_refcnt == 0. */
	+ if (!refcount_release(&fdp->fd_refcnt))
	+ panic("%s: fd table %p has extra references", __func__, fdp);
	+#endif
	fdescfree_fds(curthread, fdp, 0);
	}