syzbot

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BUG: KCSAN: data-race in netlink_getname / netlink_insert

write to 0xffff888148e59b10 of 4 bytes by task 4261 on cpu 0:
 netlink_insert+0xe8/0x900 net/netlink/af_netlink.c:583
 netlink_autobind+0xae/0x160 net/netlink/af_netlink.c:845
 netlink_sendmsg+0x444/0x760 net/netlink/af_netlink.c:1884
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 __sys_sendto+0x22d/0x2d0 net/socket.c:2117
 __do_sys_sendto net/socket.c:2129 [inline]
 __se_sys_sendto net/socket.c:2125 [inline]
 __x64_sys_sendto+0x74/0x90 net/socket.c:2125
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888148e59b10 of 4 bytes by task 4262 on cpu 1:
 netlink_getname+0xcd/0x1a0 net/netlink/af_netlink.c:1133
 __sys_getsockname+0x11d/0x1b0 net/socket.c:2026
 __do_sys_getsockname net/socket.c:2041 [inline]
 __se_sys_getsockname net/socket.c:2038 [inline]
 __x64_sys_getsockname+0x3e/0x50 net/socket.c:2038
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000 -> 0xd4e73b54

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4262 Comm: syz-executor.1 Not tainted 6.1.0-rc4-syzkaller-00294-geb037f16f7e8-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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