D58403.diff
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	diff --git a/lib/libsys/pdfork.2 b/lib/libsys/pdfork.2
	--- a/lib/libsys/pdfork.2
	+++ b/lib/libsys/pdfork.2
	@@ -195,6 +195,8 @@
	The
	.Fa flags
	argument is reserved and must be zero.
	+Certain file descriptor types cannot be copied this way, namely
	+kqueues.
	.Pp
	The following system calls also have effects specific to process descriptors:
	.Pp
	@@ -350,6 +352,10 @@
	is not a valid file descriptor in the specified process.
	.It Bq Er ENOENT
	The specified process does not have a file descriptor table.
	+.It Bq Er EOPNOTSUPP
	+.Fa remotefd
	+refers to a file that cannot be duplicated across a process boundary,
	+such as a kqueue.
	.El
	.Sh SEE ALSO
	.Xr close 2 ,
	diff --git a/sys/kern/sys_procdesc.c b/sys/kern/sys_procdesc.c
	--- a/sys/kern/sys_procdesc.c
	+++ b/sys/kern/sys_procdesc.c
	@@ -796,9 +796,13 @@
	PROC_UNLOCK(p);
	error = fget_remote(td, p, fd, &fcaps, &fd_flags, &fp);
	if (error == 0) {
	- error = finstall_refed(td, fp, &fdr, O_CLOEXEC \|
	- ((fd_flags & FD_RESOLVE_BENEATH) != 0 ?
	- O_RESOLVE_BENEATH : 0), &fcaps);
	+ if ((fp->f_ops->fo_flags & DFLAG_PASSABLE) == 0) {
	+ error = EOPNOTSUPP;
	+ } else {
	+ error = finstall_refed(td, fp, &fdr, O_CLOEXEC \|
	+ ((fd_flags & FD_RESOLVE_BENEATH) != 0 ?
	+ O_RESOLVE_BENEATH : 0), &fcaps);
	+ }
	if (error != 0) {
	fdrop(fp, td);
	filecaps_free(&fcaps);