syzbot

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BUG: KCSAN: data-race in __ip6_datagram_connect / udpv6_sendmsg

write to 0xffff88814775150c of 2 bytes by task 8382 on cpu 0:
 __ip6_datagram_connect+0x78b/0x820 net/ipv6/datagram.c:262
 ip6_datagram_connect+0x2e/0x40 net/ipv6/datagram.c:279
 inet_dgram_connect+0x114/0x1a0 net/ipv4/af_inet.c:590
 __sys_connect_file net/socket.c:2050 [inline]
 __sys_connect+0x1a1/0x1b0 net/socket.c:2067
 __do_sys_connect net/socket.c:2077 [inline]
 __se_sys_connect net/socket.c:2074 [inline]
 __x64_sys_connect+0x41/0x50 net/socket.c:2074
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff88814775150c of 2 bytes by task 8385 on cpu 1:
 udpv6_sendmsg+0x891/0x1530 net/ipv6/udp.c:1458
 inet6_sendmsg+0x63/0x80 net/ipv6/af_inet6.c:657
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x37c/0x4d0 net/socket.c:2558
 ___sys_sendmsg net/socket.c:2612 [inline]
 __sys_sendmmsg+0x269/0x500 net/socket.c:2698
 __do_sys_sendmmsg net/socket.c:2727 [inline]
 __se_sys_sendmmsg net/socket.c:2724 [inline]
 __x64_sys_sendmmsg+0x57/0x60 net/socket.c:2724
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x244e -> 0x0000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8385 Comm: syz-executor.4 Not tainted 6.6.0-syzkaller-06824-g8bc9e6515183 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
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