Re: [PATCH bpf v5 07/12] bpf: sockmap, incorrectly handling copied_seq

kernel test robot
2023-04-06T04:51:52Z

Hi John,

kernel test robot noticed the following build errors:

[auto build test ERROR on bpf/master]

url: https://github.com/intel-lab-lkp/linux/commits/John-Fastabend/bpf-sockmap-pass-skb-ownership-through-read_skb/20230406-090237
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master
patch link: https://lore.kernel.org/r/20230406010031.3354-8-john.fastabend%40gmail.com
patch subject: [PATCH bpf v5 07/12] bpf: sockmap, incorrectly handling copied_seq
config: nios2-randconfig-r024-20230403 (https://download.01.org/0day-ci/archive/20230406/202304061211.MxmUvLOR-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/intel-lab-lkp/linux/commit/4fe1333c965d96cc2aee2e018a5219a7c8b2c0c5
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review John-Fastabend/bpf-sockmap-pass-skb-ownership-through-read_skb/20230406-090237
git checkout 4fe1333c965d96cc2aee2e018a5219a7c8b2c0c5
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=nios2 olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=nios2 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304061211.MxmUvLOR-lkp@intel.com/

All errors (new ones prefixed by >>):

nios2-linux-ld: net/core/skmsg.o: in function `sk_psock_verdict_apply':
>> net/core/skmsg.c:1062: undefined reference to `tcp_eat_skb'
net/core/skmsg.c:1062:(.text+0x1348): relocation truncated to fit: R_NIOS2_CALL26 against `tcp_eat_skb'
>> nios2-linux-ld: net/core/skmsg.c:1056: undefined reference to `tcp_eat_skb'
net/core/skmsg.c:1056:(.text+0x1470): relocation truncated to fit: R_NIOS2_CALL26 against `tcp_eat_skb'
nios2-linux-ld: net/core/skmsg.o: in function `sk_psock_verdict_recv':
net/core/skmsg.c:1216: undefined reference to `tcp_eat_skb'
net/core/skmsg.c:1216:(.text+0x14c4): relocation truncated to fit: R_NIOS2_CALL26 against `tcp_eat_skb'

vim +1062 net/core/skmsg.c

986
987 static int sk_psock_verdict_apply(struct sk_psock *psock, struct sk_buff *skb,
988 int verdict)
989 {
990 struct sk_psock_work_state *state;
991 struct sock *sk_other;
992 int err = 0;
993 u32 len, off;
994
995 switch (verdict) {
996 case __SK_PASS:
997 err = -EIO;
998 sk_other = psock->sk;
999 if (sock_flag(sk_other, SOCK_DEAD) ||
1000 !sk_psock_test_state(psock, SK_PSOCK_TX_ENABLED)) {
1001 skb_bpf_redirect_clear(skb);
1002 goto out_free;
1003 }
1004
1005 skb_bpf_set_ingress(skb);
1006
1007 /* We need to grab mutex here because in-flight skb is in one of
1008 * the following states: either on ingress_skb, in psock->state
1009 * or being processed by backlog and neither in state->skb and
1010 * ingress_skb may be also empty. The troublesome case is when
1011 * the skb has been dequeued from ingress_skb list or taken from
1012 * state->skb because we can not easily test this case. Maybe we
1013 * could be clever with flags and resolve this but being clever
1014 * got us here in the first place and we note this is done under
1015 * sock lock and backlog conditions mean we are already running
1016 * into ENOMEM or other performance hindering cases so lets do
1017 * the obvious thing and grab the mutex.
1018 */
1019 mutex_lock(&psock->work_mutex);
1020 state = &psock->work_state;
1021
1022 /* If the queue is empty then we can submit directly
1023 * into the msg queue. If its not empty we have to
1024 * queue work otherwise we may get OOO data. Otherwise,
1025 * if sk_psock_skb_ingress errors will be handled by
1026 * retrying later from workqueue.
1027 */
1028 if (skb_queue_empty(&psock->ingress_skb) && likely(!state->skb)) {
1029 len = skb->len;
1030 off = 0;
1031 if (skb_bpf_strparser(skb)) {
1032 struct strp_msg *stm = strp_msg(skb);
1033
1034 off = stm->offset;
1035 len = stm->full_len;
1036 }
1037 err = sk_psock_skb_ingress_self(psock, skb, off, len);
1038 }
1039 if (err < 0) {
1040 spin_lock_bh(&psock->ingress_lock);
1041 if (sk_psock_test_state(psock, SK_PSOCK_TX_ENABLED)) {
1042 skb_queue_tail(&psock->ingress_skb, skb);
1043 schedule_delayed_work(&psock->work, 0);
1044 err = 0;
1045 }
1046 spin_unlock_bh(&psock->ingress_lock);
1047 if (err < 0) {
1048 skb_bpf_redirect_clear(skb);
1049 mutex_unlock(&psock->work_mutex);
1050 goto out_free;
1051 }
1052 }
1053 mutex_unlock(&psock->work_mutex);
1054 break;
1055 case __SK_REDIRECT:
> 1056 tcp_eat_skb(psock->sk, skb);
1057 err = sk_psock_skb_redirect(psock, skb);
1058 break;
1059 case __SK_DROP:
1060 default:
1061 out_free:
> 1062 tcp_eat_skb(psock->sk, skb);
1063 skb_bpf_redirect_clear(skb);
1064 sock_drop(psock->sk, skb);
1065 }
1066
1067 return err;
1068 }
1069

--
0-DAY CI Kernel Test Service