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/20230404-040431 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master patch link: https://lore.kernel.org/r/20230403200138.937569-8-john.fastabend%40gmail.com patch subject: [PATCH bpf v3 07/12] bpf: sockmap incorrectly handling copied_seq config: hexagon-randconfig-r041-20230403 (https://download.01.org/0day-ci/archive/20230404/202304041028.XAQryEFM-lkp@xxxxxxxxx/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 67409911353323ca5edf2049ef0df54132fa1ca7) 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/fbafbc850ec4ef5aa7e5c39d8133f291ec4c0bb8 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/20230404-040431 git checkout fbafbc850ec4ef5aa7e5c39d8133f291ec4c0bb8 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash net/core/ net/ipv4/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Link: https://lore.kernel.org/oe-kbuild-all/202304041028.XAQryEFM-lkp@xxxxxxxxx/ All error/warnings (new ones prefixed by >>): In file included from net/core/skmsg.c:4: In file included from include/linux/skmsg.h:7: In file included from include/linux/bpf.h:31: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/hexagon/include/asm/io.h:334: include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) ^ In file included from net/core/skmsg.c:4: In file included from include/linux/skmsg.h:7: In file included from include/linux/bpf.h:31: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/hexagon/include/asm/io.h:334: include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) ^ In file included from net/core/skmsg.c:4: In file included from include/linux/skmsg.h:7: In file included from include/linux/bpf.h:31: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/hexagon/include/asm/io.h:334: include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ >> net/core/skmsg.c:1056:3: error: call to undeclared function 'tcp_eat_skb'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] tcp_eat_skb(psock->sk, skb); ^ net/core/skmsg.c:1056:3: note: did you mean 'tcp_read_skb'? include/net/tcp.h:682:5: note: 'tcp_read_skb' declared here int tcp_read_skb(struct sock *sk, skb_read_actor_t recv_actor); ^ net/core/skmsg.c:1216:3: error: call to undeclared function 'tcp_eat_skb'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] tcp_eat_skb(sk, skb); ^ 6 warnings and 2 errors generated. -- In file included from net/ipv4/tcp_bpf.c:4: In file included from include/linux/skmsg.h:7: In file included from include/linux/bpf.h:31: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/hexagon/include/asm/io.h:334: include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) ^ In file included from net/ipv4/tcp_bpf.c:4: In file included from include/linux/skmsg.h:7: In file included from include/linux/bpf.h:31: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/hexagon/include/asm/io.h:334: include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) ^ In file included from net/ipv4/tcp_bpf.c:4: In file included from include/linux/skmsg.h:7: In file included from include/linux/bpf.h:31: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/hexagon/include/asm/io.h:334: include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ >> net/ipv4/tcp_bpf.c:14:6: warning: no previous prototype for function 'tcp_eat_skb' [-Wmissing-prototypes] void tcp_eat_skb(struct sock *sk, struct sk_buff *skb) ^ net/ipv4/tcp_bpf.c:14:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void tcp_eat_skb(struct sock *sk, struct sk_buff *skb) ^ static 7 warnings generated. vim +/tcp_eat_skb +1056 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 https://github.com/intel/lkp-tests
