================================================================== BUG: KCSAN: data-race in wg_packet_send_staged_packets / wg_packet_send_staged_packets write to 0xffff88802033aa08 of 4 bytes by task 9036 on cpu 0: wg_cpumask_next_online drivers/net/wireguard/queueing.h:134 [inline] wg_queue_enqueue_per_device_and_peer drivers/net/wireguard/queueing.h:153 [inline] wg_packet_create_data drivers/net/wireguard/send.c:326 [inline] wg_packet_send_staged_packets+0x5d5/0x990 drivers/net/wireguard/send.c:396 wg_packet_send_keepalive+0xea/0x100 drivers/net/wireguard/send.c:239 wg_receive_handshake_packet drivers/net/wireguard/receive.c:193 [inline] wg_packet_handshake_receive_worker+0x302/0x440 drivers/net/wireguard/receive.c:220 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275 worker_thread+0x635/0xb90 kernel/workqueue.c:2421 kthread+0x1fd/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 read to 0xffff88802033aa08 of 4 bytes by task 9553 on cpu 1: wg_cpumask_next_online drivers/net/wireguard/queueing.h:130 [inline] wg_queue_enqueue_per_device_and_peer drivers/net/wireguard/queueing.h:153 [inline] wg_packet_create_data drivers/net/wireguard/send.c:326 [inline] wg_packet_send_staged_packets+0x592/0x990 drivers/net/wireguard/send.c:396 wg_packet_send_keepalive+0xea/0x100 drivers/net/wireguard/send.c:239 wg_receive_handshake_packet drivers/net/wireguard/receive.c:193 [inline] wg_packet_handshake_receive_worker+0x302/0x440 drivers/net/wireguard/receive.c:220 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275 worker_thread+0x635/0xb90 kernel/workqueue.c:2421 kthread+0x1fd/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 9553 Comm: kworker/1:4 Not tainted 5.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: wg-kex-wg2 wg_packet_handshake_receive_worker ==================================================================