D27522.diff
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	Index: head/sys/kern/kern_descrip.c
	===================================================================
	--- head/sys/kern/kern_descrip.c
	+++ head/sys/kern/kern_descrip.c
	@@ -2466,9 +2466,13 @@
	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);
	+ /*
	+ * Serialize with threads iterating over the table, if any.
	+ */
	+ if (refcount_load(&fdp->fd_holdcnt) > 1) {
	+ FILEDESC_XLOCK(fdp);
	+ FILEDESC_XUNLOCK(fdp);
	+ }

	lastfile = fdlastfile_single(fdp);
	for (i = 0; i <= lastfile; i++) {