syzbot

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BUG: KCSAN: data-race in inet_bind_hash / inet_send_prepare

write to 0xffff88807bfae2ce of 2 bytes by task 22514 on cpu 1:
 inet_bind_hash+0x1e/0xa0 net/ipv4/inet_hashtables.c:95
 inet_csk_get_port+0x962/0xa30 net/ipv4/inet_connection_sock.c:401
 __inet_bind+0x3eb/0x620 net/ipv4/af_inet.c:528
 inet_bind+0xb0/0xd0 net/ipv4/af_inet.c:457
 __sys_bind+0x1fd/0x2a0 net/socket.c:1656
 __do_sys_bind net/socket.c:1667 [inline]
 __se_sys_bind net/socket.c:1665 [inline]
 __x64_sys_bind+0x3d/0x50 net/socket.c:1665
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88807bfae2ce of 2 bytes by task 22544 on cpu 0:
 inet_send_prepare+0x21/0x210 net/ipv4/af_inet.c:802
 inet_sendmsg+0x29/0x80 net/ipv4/af_inet.c:814
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:671 [inline]
 __sys_sendto+0x2ae/0x380 net/socket.c:1992
 __do_sys_sendto net/socket.c:2004 [inline]
 __se_sys_sendto net/socket.c:2000 [inline]
 __x64_sys_sendto+0x74/0x90 net/socket.c:2000
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22544 Comm: syz-executor.4 Not tainted 5.9.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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