================================================================== BUG: KCSAN: data-race in ip_finish_output2 / ip_finish_output2 read to 0xffff888124f35418 of 8 bytes by interrupt on cpu 0: sock_confirm_neigh include/net/sock.h:1949 [inline] ip_finish_output2+0x3ab/0xe40 net/ipv4/ip_output.c:226 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x23a/0x490 net/ipv4/ip_output.c:290 ip_finish_output+0x41/0x160 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_output+0xdf/0x210 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:436 [inline] ip_local_out+0x74/0x90 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x3a8/0xa40 net/ipv4/ip_output.c:532 ip_queue_xmit+0x45/0x60 include/net/ip.h:237 __tcp_transmit_skb+0xe81/0x1d60 net/ipv4/tcp_output.c:1169 __tcp_send_ack+0x246/0x300 net/ipv4/tcp_output.c:3696 tcp_send_ack+0x34/0x40 net/ipv4/tcp_output.c:3702 __tcp_ack_snd_check+0xd9/0x4f0 net/ipv4/tcp_input.c:5241 tcp_rcv_established+0xce9/0xf50 net/ipv4/tcp_input.c:5672 tcp_v4_do_rcv+0x381/0x4e0 net/ipv4/tcp_ipv4.c:1561 tcp_v4_rcv+0x19dc/0x1bb0 net/ipv4/tcp_ipv4.c:1942 write to 0xffff888124f35418 of 8 bytes by task 7224 on cpu 1: sock_confirm_neigh include/net/sock.h:1950 [inline] ip_finish_output2+0x3d6/0xe40 net/ipv4/ip_output.c:226 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x23a/0x490 net/ipv4/ip_output.c:290 ip_finish_output+0x41/0x160 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_output+0xdf/0x210 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:436 [inline] ip_local_out+0x74/0x90 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x3a8/0xa40 net/ipv4/ip_output.c:532 ip_queue_xmit+0x45/0x60 include/net/ip.h:237 __tcp_transmit_skb+0xe81/0x1d60 net/ipv4/tcp_output.c:1169 tcp_transmit_skb net/ipv4/tcp_output.c:1185 [inline] tcp_write_xmit+0x9f3/0x3080 net/ipv4/tcp_output.c:2440 __tcp_push_pending_frames+0x7b/0x1d0 net/ipv4/tcp_output.c:2616 tcp_push+0x1e9/0x3d0 net/ipv4/tcp.c:724 tcp_sendmsg_locked+0x1d1e/0x1f30 net/ipv4/tcp.c:1403 tcp_sendmsg+0x39/0x60 net/ipv4/tcp.c:1434 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 7224 Comm: sshd Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================