================================================================== BUG: KCSAN: data-race in wg_packet_send_staged_packets / wg_packet_send_staged_packets read to 0xffff8881335f6b28 of 4 bytes by task 4496 on cpu 1: wg_cpumask_next_online drivers/net/wireguard/queueing.h:127 [inline] wg_queue_enqueue_per_device_and_peer drivers/net/wireguard/queueing.h:173 [inline] wg_packet_create_data drivers/net/wireguard/send.c:320 [inline] wg_packet_send_staged_packets+0x614/0xae0 drivers/net/wireguard/send.c:388 wg_packet_send_keepalive+0xe2/0x100 drivers/net/wireguard/send.c:239 wg_receive_handshake_packet drivers/net/wireguard/receive.c:186 [inline] wg_packet_handshake_receive_worker+0x449/0x5f0 drivers/net/wireguard/receive.c:213 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0x465/0x990 kernel/workqueue.c:3335 worker_thread+0x526/0x730 kernel/workqueue.c:3416 kthread+0x1d1/0x210 kernel/kthread.c:388 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 write to 0xffff8881335f6b28 of 4 bytes by task 1096 on cpu 0: wg_cpumask_next_online drivers/net/wireguard/queueing.h:130 [inline] wg_queue_enqueue_per_device_and_peer drivers/net/wireguard/queueing.h:173 [inline] wg_packet_create_data drivers/net/wireguard/send.c:320 [inline] wg_packet_send_staged_packets+0x6f9/0xae0 drivers/net/wireguard/send.c:388 wg_packet_send_keepalive+0xe2/0x100 drivers/net/wireguard/send.c:239 wg_receive_handshake_packet drivers/net/wireguard/receive.c:186 [inline] wg_packet_handshake_receive_worker+0x449/0x5f0 drivers/net/wireguard/receive.c:213 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0x465/0x990 kernel/workqueue.c:3335 worker_thread+0x526/0x730 kernel/workqueue.c:3416 kthread+0x1d1/0x210 kernel/kthread.c:388 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 value changed: 0xffffffff -> 0x00000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1096 Comm: kworker/0:11 Tainted: G W 6.9.0-rc3-syzkaller-00023-g2c71fdf02a95 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: wg-kex-wg2 wg_packet_handshake_receive_worker ================================================================== kernel write not supported for file /uhid (pid: 1096 comm: kworker/0:11) hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: unknown main item tag 0x0 hid-generic 0000:0000:0000.0035: hidraw0: HID v0.00 Device [syz0] on syz1