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BUG: KCSAN: data-race in prandom_seed / prandom_u32

write to 0xffff888237c28860 of 8 bytes by task 1913 on cpu 0:
 siprand_u32 lib/random32.c:372 [inline]
 prandom_u32+0x13e/0x190 lib/random32.c:387
 prandom_u32_max include/linux/prandom.h:96 [inline]
 wg_timers_data_sent+0x46/0x100 drivers/net/wireguard/timers.c:150
 wg_packet_create_data_done drivers/net/wireguard/send.c:257 [inline]
 wg_packet_tx_worker+0x1b4/0x360 drivers/net/wireguard/send.c:276
 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

read to 0xffff888237c28860 of 8 bytes by task 1966 on cpu 1:
 prandom_seed+0x103/0x270 lib/random32.c:440
 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: 0x3716a427e76936ea -> 0x00c68b13365bb3ca

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1966 Comm: kworker/1:6 Not tainted 5.18.0-rc7-syzkaller-00121-g3d7285a335ed-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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