When removing a rule with an objref expression and the object it references in the same batch, it will return EBUSY. The backported commit has a Fixes line for one of the commits recently backported.
Pablo Neira Ayuso (1): netfilter: nf_tables: bogus EBUSY in helper removal from transaction
net/netfilter/nft_objref.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-)