The branch main has been updated by kib:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=26af9f72f7cb162abeced8b7e444800b601e5017

commit 26af9f72f7cb162abeced8b7e444800b601e5017
Author:     Konstantin Belousov <[email protected]>
AuthorDate: 2021-01-31 19:01:17 +0000
Commit:     Konstantin Belousov <[email protected]>
CommitDate: 2021-02-12 01:02:22 +0000

    ffs_unlock: assert that IN_ENDOFF is not leaked past locked scope
    
    This catches both missed processing of IN_ENDOFF and missed application
    of VOP_VPUT_PAIR() after VOP that created an entry in the directory.
    
    Reviewed by:    chs, mckusick
    Tested by:      pho
    MFC after:      2 weeks
    Sponsored by:   The FreeBSD Foundation
---
 sys/ufs/ffs/ffs_vnops.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/ufs/ffs/ffs_vnops.c b/sys/ufs/ffs/ffs_vnops.c
index 38511647c502..1dfdf5182a42 100644
--- a/sys/ufs/ffs/ffs_vnops.c
+++ b/sys/ufs/ffs/ffs_vnops.c
@@ -591,6 +591,9 @@ ffs_unlock_debug(struct vop_unlock_args *ap)
                        VI_UNLOCK(vp);
                }
        }
+       KASSERT(vp->v_type != VDIR || vp->v_vnlock->lk_recurse != 0 ||
+           (ip->i_flag & IN_ENDOFF) == 0,
+           ("ufs dir vp %p ip %p flags %#x", vp, ip, ip->i_flag));
 #ifdef DIAGNOSTIC
        if (VOP_ISLOCKED(vp) == LK_EXCLUSIVE && ip != NULL &&
            vp->v_vnlock->lk_recurse == 0)
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