Hi Kees, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git kspp/memcpy/next-20210803/v2-devel head: 4752984fc24104f399e70f99d48afa047d86a381 commit: 4752984fc24104f399e70f99d48afa047d86a381 [86/86] DEBUG find 0-element destinations config: x86_64-rhel-8.3-kselftests (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?id=4752984fc24104f399e70f99d48afa047d86a381 git remote add kees https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git git fetch --no-tags kees kspp/memcpy/next-20210803/v2-devel git checkout 4752984fc24104f399e70f99d48afa047d86a381 # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> progs/bpf_iter_netlink.c:11:9: warning: incompatible pointer types returning 'struct inode___50 *' from a function with result type 'struct inode *' [-Wincompatible-pointer-types] return &container_of(socket, struct socket_alloc, socket)->vfs_inode; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> progs/bpf_iter_netlink.c:32:4: warning: incompatible pointer types assigning to 'struct sock *' from 'struct sock___95 *' [-Wincompatible-pointer-types] s = &nlk->sk; ^ ~~~~~~~~ 2 warnings generated. -- >> progs/bpf_iter_tcp6.c:58:8: warning: incompatible pointer types assigning to 'const struct inode *' from 'struct inode___50 *' [-Wincompatible-pointer-types] inode = &container_of(sk_socket, struct socket_alloc, socket)->vfs_inode; ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ progs/bpf_iter_tcp6.c:89:7: warning: incompatible pointer types assigning to 'const struct inet_sock *' from 'const struct inet_sock___5 *' [-Wincompatible-pointer-types] inet = &icsk->icsk_inet; ^ ~~~~~~~~~~~~~~~~ >> progs/bpf_iter_tcp6.c:90:5: warning: incompatible pointer types assigning to 'const struct sock *' from 'const struct sock___39 *' [-Wincompatible-pointer-types] sp = &inet->sk; ^ ~~~~~~~~~ >> progs/bpf_iter_tcp6.c:185:23: warning: incompatible pointer types initializing 'struct request_sock *' with an expression of type 'struct request_sock___54 *' [-Wincompatible-pointer-types] struct request_sock *req = &irsk->req; ^ ~~~~~~~~~~ 4 warnings generated. -- >> progs/bpf_iter_udp6.c:26:8: warning: incompatible pointer types assigning to 'const struct inode *' from 'struct inode___50 *' [-Wincompatible-pointer-types] inode = &container_of(sk_socket, struct socket_alloc, socket)->vfs_inode; ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ progs/bpf_iter_udp6.c:54:7: warning: incompatible pointer types assigning to 'struct inet_sock *' from 'struct inet_sock___2 *' [-Wincompatible-pointer-types] inet = &udp_sk->inet; ^ ~~~~~~~~~~~~~ >> progs/bpf_iter_udp6.c:73:21: warning: incompatible pointer types passing 'struct sock___39 *' to parameter of type 'const struct sock *' [-Wincompatible-pointer-types] sock_i_ino(&inet->sk), ^~~~~~~~~ /tools/include/bpf/bpf_helpers.h:202:24: note: expanded from macro 'BPF_SEQ_PRINTF' ___bpf_fill(___param, args); \ ^~~~ /tools/include/bpf/bpf_helpers.h:189:55: note: expanded from macro '___bpf_fill' ___bpf_apply(___bpf_fill, ___bpf_narg(args))(arr, 0, args) ^~~~ /tools/include/bpf/bpf_helpers.h:187:81: note: expanded from macro '___bpf_fill12' #define ___bpf_fill12(arr, p, x, args...) arr[p] = x; ___bpf_fill11(arr, p + 1, args) ^~~~ note: (skipping 5 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) /tools/include/bpf/bpf_helpers.h:181:79: note: expanded from macro '___bpf_fill6' #define ___bpf_fill6(arr, p, x, args...) arr[p] = x; ___bpf_fill5(arr, p + 1, args) ^~~~ /tools/include/bpf/bpf_helpers.h:180:79: note: expanded from macro '___bpf_fill5' #define ___bpf_fill5(arr, p, x, args...) arr[p] = x; ___bpf_fill4(arr, p + 1, args) ^~~~ /tools/include/bpf/bpf_helpers.h:179:51: note: expanded from macro '___bpf_fill4' #define ___bpf_fill4(arr, p, x, args...) arr[p] = x; ___bpf_fill3(arr, p + 1, args) ^ progs/bpf_iter_udp6.c:17:43: note: passing argument to parameter 'sk' here static long sock_i_ino(const struct sock *sk) ^ 3 warnings generated. -- >> progs/bpf_iter_udp4.c:19:8: warning: incompatible pointer types assigning to 'const struct inode *' from 'struct inode___50 *' [-Wincompatible-pointer-types] inode = &container_of(sk_socket, struct socket_alloc, socket)->vfs_inode; ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ progs/bpf_iter_udp4.c:46:7: warning: incompatible pointer types assigning to 'struct inet_sock *' from 'struct inet_sock___2 *' [-Wincompatible-pointer-types] inet = &udp_sk->inet; ^ ~~~~~~~~~~~~~ progs/bpf_iter_udp4.c:50:7: warning: incompatible pointer types assigning to 'struct inet_sock *' from 'struct inet_sock___2 *' [-Wincompatible-pointer-types] inet = &udp_sk->inet; ^ ~~~~~~~~~~~~~ >> progs/bpf_iter_udp4.c:65:21: warning: incompatible pointer types passing 'struct sock___39 *' to parameter of type 'const struct sock *' [-Wincompatible-pointer-types] sock_i_ino(&inet->sk), ^~~~~~~~~ /tools/include/bpf/bpf_helpers.h:202:24: note: expanded from macro 'BPF_SEQ_PRINTF' ___bpf_fill(___param, args); \ ^~~~ /tools/include/bpf/bpf_helpers.h:189:55: note: expanded from macro '___bpf_fill' ___bpf_apply(___bpf_fill, ___bpf_narg(args))(arr, 0, args) ^~~~ /tools/include/bpf/bpf_helpers.h:187:81: note: expanded from macro '___bpf_fill12' #define ___bpf_fill12(arr, p, x, args...) arr[p] = x; ___bpf_fill11(arr, p + 1, args) ^~~~ note: (skipping 5 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) /tools/include/bpf/bpf_helpers.h:181:79: note: expanded from macro '___bpf_fill6' #define ___bpf_fill6(arr, p, x, args...) arr[p] = x; ___bpf_fill5(arr, p + 1, args) ^~~~ /tools/include/bpf/bpf_helpers.h:180:79: note: expanded from macro '___bpf_fill5' #define ___bpf_fill5(arr, p, x, args...) arr[p] = x; ___bpf_fill4(arr, p + 1, args) ^~~~ /tools/include/bpf/bpf_helpers.h:179:51: note: expanded from macro '___bpf_fill4' #define ___bpf_fill4(arr, p, x, args...) arr[p] = x; ___bpf_fill3(arr, p + 1, args) ^ progs/bpf_iter_udp4.c:10:43: note: passing argument to parameter 'sk' here static long sock_i_ino(const struct sock *sk) ^ 4 warnings generated. -- >> progs/bpf_iter_tcp4.c:58:8: warning: incompatible pointer types assigning to 'const struct inode *' from 'struct inode___50 *' [-Wincompatible-pointer-types] inode = &container_of(sk_socket, struct socket_alloc, socket)->vfs_inode; ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ progs/bpf_iter_tcp4.c:89:7: warning: incompatible pointer types assigning to 'const struct inet_sock *' from 'const struct inet_sock___5 *' [-Wincompatible-pointer-types] inet = &icsk->icsk_inet; ^ ~~~~~~~~~~~~~~~~ >> progs/bpf_iter_tcp4.c:90:5: warning: incompatible pointer types assigning to 'const struct sock *' from 'const struct sock___39 *' [-Wincompatible-pointer-types] sp = &inet->sk; ^ ~~~~~~~~~ >> progs/bpf_iter_tcp4.c:176:23: warning: incompatible pointer types initializing 'struct request_sock *' with an expression of type 'struct request_sock___54 *' [-Wincompatible-pointer-types] struct request_sock *req = &irsk->req; ^ ~~~~~~~~~~ 4 warnings generated. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org