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BUG: KCSAN: data-race in prandom_seed / prandom_u32

write to 0xffff888237c28850 of 8 bytes by task 1831 on cpu 0:
 siprand_u32 lib/random32.c:372 [inline]
 prandom_u32+0x11f/0x190 lib/random32.c:387
 prandom_u32_max include/linux/prandom.h:96 [inline]
 netlink_autobind+0xea/0x160 net/netlink/af_netlink.c:838
 netlink_sendmsg+0x43f/0x750 net/netlink/af_netlink.c:1884
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 __sys_sendto+0x21e/0x2c0 net/socket.c:2040
 __do_sys_sendto net/socket.c:2052 [inline]
 __se_sys_sendto net/socket.c:2048 [inline]
 __x64_sys_sendto+0x74/0x90 net/socket.c:2048
 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+0x44/0xae

read to 0xffff888237c28850 of 8 bytes by task 1912 on cpu 1:
 prandom_seed+0xd3/0x270 lib/random32.c:439
 addrconf_dad_begin net/ipv6/addrconf.c:3975 [inline]
 addrconf_dad_work+0x265/0xbb0 net/ipv6/addrconf.c:4100
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x57c16d84b66642dc -> 0x1114e8c898bebcb7

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1912 Comm: kworker/1:4 Not tainted 5.18.0-rc7-syzkaller-00119-gb015dcd62b86-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ipv6_addrconf addrconf_dad_work
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IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready