syzbot

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BUG: KCSAN: data-race in netlink_dump / netlink_recvmsg

write to 0xffff88812da01359 of 1 bytes by task 9089 on cpu 0:
 netlink_dump+0x648/0x710 net/netlink/af_netlink.c:2305
 netlink_recvmsg+0x420/0x750 net/netlink/af_netlink.c:1995
 sock_recvmsg_nosec net/socket.c:1019 [inline]
 sock_recvmsg net/socket.c:1040 [inline]
 ____sys_recvmsg+0x156/0x310 net/socket.c:2722
 ___sys_recvmsg net/socket.c:2764 [inline]
 do_recvmmsg+0x2e5/0x710 net/socket.c:2858
 __sys_recvmmsg net/socket.c:2937 [inline]
 __do_sys_recvmmsg net/socket.c:2960 [inline]
 __se_sys_recvmmsg net/socket.c:2953 [inline]
 __x64_sys_recvmmsg+0xe2/0x160 net/socket.c:2953
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88812da01359 of 1 bytes by task 9100 on cpu 1:
 netlink_recvmsg+0x3b4/0x750 net/netlink/af_netlink.c:1993
 sock_recvmsg_nosec+0x4c/0x80 net/socket.c:1019
 ____sys_recvmsg+0x2db/0x310 net/socket.c:2720
 ___sys_recvmsg net/socket.c:2764 [inline]
 do_recvmmsg+0x2e5/0x710 net/socket.c:2858
 __sys_recvmmsg net/socket.c:2937 [inline]
 __do_sys_recvmmsg net/socket.c:2960 [inline]
 __se_sys_recvmmsg net/socket.c:2953 [inline]
 __x64_sys_recvmmsg+0xe2/0x160 net/socket.c:2953
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x01 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9100 Comm: syz-executor.0 Not tainted 6.4.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
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