syzbot

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BUG: KCSAN: data-race in packet_do_bind / packet_sendmsg

read to 0xffff8880b0a37cc8 of 2 bytes by task 14066 on cpu 0:
 packet_snd net/packet/af_packet.c:2849 [inline]
 packet_sendmsg+0x134d/0x3b60 net/packet/af_packet.c:2990
 sock_sendmsg_nosec net/socket.c:639 [inline]
 sock_sendmsg+0x9f/0xc0 net/socket.c:659
 __sys_sendto+0x21f/0x320 net/socket.c:1985
 __do_sys_sendto net/socket.c:1997 [inline]
 __se_sys_sendto net/socket.c:1993 [inline]
 __x64_sys_sendto+0x89/0xb0 net/socket.c:1993
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8880b0a37cc8 of 2 bytes by task 14052 on cpu 1:
 packet_do_bind+0x4c6/0x630 net/packet/af_packet.c:3131
 packet_bind+0xab/0xf0 net/packet/af_packet.c:3205
 __sys_bind+0x1df/0x220 net/socket.c:1649
 __do_sys_bind net/socket.c:1660 [inline]
 __se_sys_bind net/socket.c:1658 [inline]
 __x64_sys_bind+0x4c/0x60 net/socket.c:1658
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 14052 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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