================================================================== BUG: KCSAN: data-race in inet_sk_diag_fill / tcp_sendmsg_locked write to 0xffff888130f523f8 of 4 bytes by task 4326 on cpu 1: sk_mem_charge include/net/sock.h:1578 [inline] skb_copy_to_page_nocache include/net/sock.h:2180 [inline] tcp_sendmsg_locked+0x1389/0x25a0 net/ipv4/tcp.c:1334 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1440 inet6_sendmsg+0x5f/0x80 net/ipv6/af_inet6.c:644 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] __sys_sendto+0x21e/0x2c0 net/socket.c:2036 __do_sys_sendto net/socket.c:2048 [inline] __se_sys_sendto net/socket.c:2044 [inline] __x64_sys_sendto+0x74/0x90 net/socket.c:2044 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888130f523f8 of 4 bytes by task 4327 on cpu 0: sk_forward_alloc_get include/net/sock.h:1303 [inline] inet_sk_diag_fill+0x4a5/0xc70 net/ipv4/inet_diag.c:274 sk_diag_fill+0x17c/0x860 net/ipv4/inet_diag.c:508 inet_diag_dump_icsk+0x93b/0xb50 net/ipv4/inet_diag.c:1142 tcp_diag_dump+0x28/0x30 net/ipv4/tcp_diag.c:184 __inet_diag_dump+0x17d/0x220 net/ipv4/inet_diag.c:1180 inet_diag_dump_compat+0xcf/0x100 net/ipv4/inet_diag.c:1288 netlink_dump+0x364/0x6b0 net/netlink/af_netlink.c:2265 __netlink_dump_start+0x3eb/0x4e0 net/netlink/af_netlink.c:2370 netlink_dump_start include/linux/netlink.h:254 [inline] inet_diag_rcv_msg_compat+0x1c4/0x1f0 net/ipv4/inet_diag.c:1322 sock_diag_rcv_msg+0x12b/0x250 netlink_rcv_skb+0x14e/0x250 net/netlink/af_netlink.c:2491 sock_diag_rcv+0x24/0x40 net/core/sock_diag.c:276 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x5fc/0x6c0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x6e1/0x7d0 net/netlink/af_netlink.c:1916 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0x39a/0x510 net/socket.c:2409 ___sys_sendmsg net/socket.c:2463 [inline] __sys_sendmsg+0x195/0x230 net/socket.c:2492 __do_sys_sendmsg net/socket.c:2501 [inline] __se_sys_sendmsg net/socket.c:2499 [inline] __x64_sys_sendmsg+0x42/0x50 net/socket.c:2499 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0010e5d0 -> 0x00103180 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 4327 Comm: syz-executor.4 Not tainted 5.16.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================