KCSAN: data-race in __sock_set_timestamps / pfkey_recvmsg

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 509a1542 Merge tag '5.10-rc6-smb3-fixes' of git://git.samb..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1549c19d500000
kernel config: https://syzkaller.appspot.com/x/.config?x=c949fed53798f819
dashboard link: https://syzkaller.appspot.com/bug?extid=a1a81ddcddcfc944ee91
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project.git 913f6005669cfb590c99865a90bc51ed0983d09d)
CC: [da...@davemloft.net ku...@kernel.org linux-...@vger.kernel.org net...@vger.kernel.org]

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a1a81d...@syzkaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in __sock_set_timestamps / pfkey_recvmsg

write to 0xffff888021e19860 of 8 bytes by task 28076 on cpu 0:
__sock_set_timestamps+0x2e/0x150 net/core/sock.c:751
sock_setsockopt+0xc8f/0x1ef0 net/core/sock.c:987
__sys_setsockopt+0x326/0x450 net/socket.c:2128
__do_sys_setsockopt net/socket.c:2143 [inline]
__se_sys_setsockopt net/socket.c:2140 [inline]
__x64_sys_setsockopt+0x62/0x70 net/socket.c:2140
do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888021e19860 of 8 bytes by task 28080 on cpu 1:
sock_recv_ts_and_drops include/net/sock.h:2455 [inline]
pfkey_recvmsg+0x1a3/0x370 net/key/af_key.c:3718
____sys_recvmsg+0x15d/0x310 include/linux/uio.h:234
___sys_recvmsg net/socket.c:2618 [inline]
do_recvmmsg+0x4b3/0x990 net/socket.c:2718
__sys_recvmmsg net/socket.c:2799 [inline]
__do_sys_recvmmsg net/socket.c:2820 [inline]
__se_sys_recvmmsg net/socket.c:2813 [inline]
__x64_sys_recvmmsg+0xe6/0x150 net/socket.c:2813
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: 1 PID: 28080 Comm: syz-executor.4 Not tainted 5.10.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.