tree: https://git.kernel.org/pub/scm/linux/kernel/git/dborkman/bpf.git pr/bpf-tc-misc3 head: 97bdeecb686906dd717fee42dc8f4ecaf6237abc commit: 97bdeecb686906dd717fee42dc8f4ecaf6237abc [10/10] bpf: add redirect_neigh helper as redirect drop-in config: i386-randconfig-a011-20200917 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): git checkout 97bdeecb686906dd717fee42dc8f4ecaf6237abc # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ld: net/core/filter.o: in function `___neigh_lookup_noref': ld: net/core/filter.o: in function `bpf_out_neigh_v6': ld: net/core/filter.o: in function `ip6_route_output': # https://git.kernel.org/pub/scm/linux/kernel/git/dborkman/bpf.git/commit/?... git remote add dborkman https://git.kernel.org/pub/scm/linux/kernel/git/dborkman/bpf.git git fetch --no-tags dborkman pr/bpf-tc-misc3 git checkout 97bdeecb686906dd717fee42dc8f4ecaf6237abc vim +289 include/net/neighbour.h 60395a20ffd741 Eric W. Biederman 2015-03-03 279 60395a20ffd741 Eric W. Biederman 2015-03-03 280 static inline struct neighbour *___neigh_lookup_noref( 60395a20ffd741 Eric W. Biederman 2015-03-03 281 struct neigh_table *tbl, 60395a20ffd741 Eric W. Biederman 2015-03-03 282 bool (*key_eq)(const struct neighbour *n, const void *pkey), 60395a20ffd741 Eric W. Biederman 2015-03-03 283 __u32 (*hash)(const void *pkey, 60395a20ffd741 Eric W. Biederman 2015-03-03 284 const struct net_device *dev, 60395a20ffd741 Eric W. Biederman 2015-03-03 285 __u32 *hash_rnd), 60395a20ffd741 Eric W. Biederman 2015-03-03 286 const void *pkey, 60395a20ffd741 Eric W. Biederman 2015-03-03 287 struct net_device *dev) 60395a20ffd741 Eric W. Biederman 2015-03-03 288 { 60395a20ffd741 Eric W. Biederman 2015-03-03 @289 struct neigh_hash_table *nht = rcu_dereference_bh(tbl->nht); 60395a20ffd741 Eric W. Biederman 2015-03-03 290 struct neighbour *n; 60395a20ffd741 Eric W. Biederman 2015-03-03 291 u32 hash_val; 60395a20ffd741 Eric W. Biederman 2015-03-03 292 60395a20ffd741 Eric W. Biederman 2015-03-03 293 hash_val = hash(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift); 60395a20ffd741 Eric W. Biederman 2015-03-03 294 for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); 60395a20ffd741 Eric W. Biederman 2015-03-03 295 n != NULL; 60395a20ffd741 Eric W. Biederman 2015-03-03 296 n = rcu_dereference_bh(n->next)) { 60395a20ffd741 Eric W. Biederman 2015-03-03 297 if (n->dev == dev && key_eq(n, pkey)) 60395a20ffd741 Eric W. Biederman 2015-03-03 298 return n; 60395a20ffd741 Eric W. Biederman 2015-03-03 299 } 60395a20ffd741 Eric W. Biederman 2015-03-03 300 60395a20ffd741 Eric W. Biederman 2015-03-03 301 return NULL; 60395a20ffd741 Eric W. Biederman 2015-03-03 302 } 60395a20ffd741 Eric W. Biederman 2015-03-03 303 :::::: The code at line 289 was first introduced by commit :::::: 60395a20ffd74166ea373ea91418d6f98fa7fdfb neigh: Factor out ___neigh_lookup_noref :::::: TO: Eric W. Biederman <ebiederm(a)xmission.com&gt; :::::: CC: David S. Miller <davem(a)davemloft.net&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org