syzbot

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BUG: KCSAN: data-race in wg_index_hashtable_insert / wg_index_hashtable_lookup

write to 0xffff888150a83afc of 4 bytes by task 3371 on cpu 1:
 wg_index_hashtable_insert+0xe3/0x2b0 drivers/net/wireguard/peerlookup.c:132
 wg_noise_handshake_create_response+0x52c/0x5e0 drivers/net/wireguard/noise.c:713
 wg_packet_send_handshake_response+0x6d/0x120 drivers/net/wireguard/send.c:94
 wg_receive_handshake_packet drivers/net/wireguard/receive.c:154 [inline]
 wg_packet_handshake_receive_worker+0x3cc/0x5d0 drivers/net/wireguard/receive.c:213
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3340
 worker_thread+0x582/0x770 kernel/workqueue.c:3421
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x149/0x290 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

read to 0xffff888150a83afc of 4 bytes by task 3656 on cpu 0:
 wg_index_hashtable_lookup+0x6b/0x130 drivers/net/wireguard/peerlookup.c:211
 wg_noise_handshake_consume_response+0x12a/0x800 drivers/net/wireguard/noise.c:747
 wg_receive_handshake_packet drivers/net/wireguard/receive.c:166 [inline]
 wg_packet_handshake_receive_worker+0x3da/0x5d0 drivers/net/wireguard/receive.c:213
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3340
 worker_thread+0x582/0x770 kernel/workqueue.c:3421
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x149/0x290 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

value changed: 0x86e8218e -> 0xba92c323

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3656 Comm: kworker/0:8 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: wg-kex-wg1 wg_packet_handshake_receive_worker
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