==================================================================
BUG: KCSAN: data-race in __dev_queue_xmit / __dev_queue_xmit

write to 0xffff8880a1e6d884 of 4 bytes by task 12129 on cpu 0:
 __netif_tx_unlock include/linux/netdevice.h:4045 [inline]
 __dev_queue_xmit+0x1270/0x1810 net/core/dev.c:4055
 dev_queue_xmit+0x1e/0x30 net/core/dev.c:4085
 packet_snd net/packet/af_packet.c:2979 [inline]
 packet_sendmsg+0x1eaf/0x3ac0 net/packet/af_packet.c:3004
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0x98/0xc0 net/socket.c:672
 ____sys_sendmsg+0x207/0x4c0 net/socket.c:2362
 ___sys_sendmsg+0xb5/0x100 net/socket.c:2416
 __sys_sendmmsg+0x10e/0x310 net/socket.c:2506
 __do_sys_sendmmsg net/socket.c:2535 [inline]
 __se_sys_sendmmsg net/socket.c:2532 [inline]
 __x64_sys_sendmmsg+0x60/0x80 net/socket.c:2532
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880a1e6d884 of 4 bytes by task 12132 on cpu 1:
 __dev_queue_xmit+0xb23/0x1810 net/core/dev.c:4040
 dev_queue_xmit+0x1e/0x30 net/core/dev.c:4085
 packet_snd net/packet/af_packet.c:2979 [inline]
 packet_sendmsg+0x1eaf/0x3ac0 net/packet/af_packet.c:3004
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0x98/0xc0 net/socket.c:672
 ____sys_sendmsg+0x207/0x4c0 net/socket.c:2362
 ___sys_sendmsg+0xb5/0x100 net/socket.c:2416
 __sys_sendmmsg+0x10e/0x310 net/socket.c:2506
 __do_sys_sendmmsg net/socket.c:2535 [inline]
 __se_sys_sendmmsg net/socket.c:2532 [inline]
 __x64_sys_sendmmsg+0x60/0x80 net/socket.c:2532
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 12132 Comm: syz-executor.4 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================