syzbot

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BUG: KCSAN: data-race in netlink_recvmsg / netlink_recvmsg

read to 0xffff888104ed2338 of 8 bytes by task 24160 on cpu 1:
 netlink_recvmsg+0xee/0x740 net/netlink/af_netlink.c:1978
 sock_recvmsg_nosec net/socket.c:995 [inline]
 sock_recvmsg net/socket.c:1013 [inline]
 __sys_recvfrom+0x1db/0x2a0 net/socket.c:2169
 __do_sys_recvfrom net/socket.c:2187 [inline]
 __se_sys_recvfrom net/socket.c:2183 [inline]
 __x64_sys_recvfrom+0x74/0x90 net/socket.c:2183
 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

write to 0xffff888104ed2338 of 8 bytes by task 24154 on cpu 0:
 netlink_recvmsg+0x12c/0x740 net/netlink/af_netlink.c:1979
 sock_recvmsg_nosec net/socket.c:995 [inline]
 sock_recvmsg net/socket.c:1013 [inline]
 __sys_recvfrom+0x1db/0x2a0 net/socket.c:2169
 __do_sys_recvfrom net/socket.c:2187 [inline]
 __se_sys_recvfrom net/socket.c:2183 [inline]
 __x64_sys_recvfrom+0x74/0x90 net/socket.c:2183
 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: 0x0000000000000000 -> 0x0000000000001000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 24154 Comm: syz-executor.2 Not tainted 6.2.0-rc3-syzkaller-00060-gc757fc92a3f7-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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