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BUG: KCSAN: data-race in prandom_seed / prandom_u32

write to 0xffff88813bc28510 of 8 bytes by task 5 on cpu 0:
 siprand_u32 lib/random32.c:372 [inline]
 prandom_u32+0x104/0x1f0 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+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff88813bc28510 of 8 bytes by task 19 on cpu 1:
 prandom_seed+0xf5/0x270 lib/random32.c:441
 addrconf_dad_begin net/ipv6/addrconf.c:3939 [inline]
 addrconf_dad_work+0x258/0x1160 net/ipv6/addrconf.c:4064
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19 Comm: kworker/1:0 Not tainted 5.12.0-rc5-syzkaller #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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Bluetooth: hci1: command 0x041b tx timeout
Bluetooth: hci0: command 0x040f tx timeout