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-rw-r--r--sys/kern/kern_conf.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/kern/kern_conf.c b/sys/kern/kern_conf.c
index 866788530e7f..a3af24a43b61 100644
--- a/sys/kern/kern_conf.c
+++ b/sys/kern/kern_conf.c
@@ -119,6 +119,8 @@ dev_free_devlocked(struct cdev *cdev)
cdp = cdev2priv(cdev);
KASSERT((cdp->cdp_flags & CDP_UNREF_DTR) == 0,
("destroy_dev() was not called after delist_dev(%p)", cdev));
+ KASSERT((cdp->cdp_flags & CDP_ON_ACTIVE_LIST) == 0,
+ ("%s: cdp %p (%s) on active list", __func__, cdp, cdev->si_name));
TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list);
}