lib/PublicInbox/DSKQXS.pm | 2 ++

diff --git a/lib/PublicInbox/DSKQXS.pm b/lib/PublicInbox/DSKQXS.pm
index 7141b1317f96d87ebae12fb4417df1e52ffd6da5..4114a6af2f55f5374836ea8a948fc3cb0efdbb51 100644
--- a/lib/PublicInbox/DSKQXS.pm
+++ b/lib/PublicInbox/DSKQXS.pm
@@ -107,6 +107,8 @@ 	if ($op == EPOLL_CTL_MOD) {
 		$kq->EV_SET($fd, EVFILT_READ, kq_flag(EPOLLIN, $ev));
 		eval { $kq->EV_SET($fd, EVFILT_WRITE, kq_flag(EPOLLOUT, $ev)) };
 	} elsif ($op == EPOLL_CTL_DEL) {
+		use Carp ();
+		$kq // Carp::confess("nokq $fd");
 		$kq->EV_SET($fd, EVFILT_READ, EV_DISABLE);
 		eval { $kq->EV_SET($fd, EVFILT_WRITE, EV_DISABLE) };
 	} else { # EPOLL_CTL_ADD