syzbot

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BUG: KCSAN: data-race in wg_index_hashtable_insert / wg_index_hashtable_lookup

write to 0xffff88811a20e80c of 4 bytes by task 1056 on cpu 0:
 wg_index_hashtable_insert+0xe3/0x2b0 drivers/net/wireguard/peerlookup.c:132
 wg_noise_handshake_create_response+0x5e3/0x6b0 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+0x3e1/0x5d0 drivers/net/wireguard/receive.c:213
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3319
 worker_thread+0x582/0x770 kernel/workqueue.c:3400
 kthread+0x486/0x510 kernel/kthread.c:463
 ret_from_fork+0xda/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff88811a20e80c of 4 bytes by task 3378 on cpu 1:
 wg_index_hashtable_lookup+0x6b/0x130 drivers/net/wireguard/peerlookup.c:211
 wg_noise_handshake_consume_response+0x12a/0x840 drivers/net/wireguard/noise.c:747
 wg_receive_handshake_packet drivers/net/wireguard/receive.c:166 [inline]
 wg_packet_handshake_receive_worker+0x3ef/0x5d0 drivers/net/wireguard/receive.c:213
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3319
 worker_thread+0x582/0x770 kernel/workqueue.c:3400
 kthread+0x486/0x510 kernel/kthread.c:463
 ret_from_fork+0xda/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x7585cca5 -> 0xa3089052

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3378 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: wg-kex-wg0 wg_packet_handshake_receive_worker
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