================================================================== BUG: KCSAN: data-race in wg_packet_send_staged_packets / wg_packet_send_staged_packets read to 0xffff88812997ea48 of 4 bytes by interrupt 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_expired_send_persistent_keepalive+0x38/0x50 drivers/net/wireguard/timers.c:141 call_timer_fn+0x2e/0x240 kernel/time/timer.c:1410 expire_timers+0x116/0x260 kernel/time/timer.c:1455 __run_timers+0x328/0x3c0 kernel/time/timer.c:1747 run_timer_softirq+0x19/0x30 kernel/time/timer.c:1760 __do_softirq+0x12c/0x2b1 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x32/0x40 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu+0xb2/0xc0 kernel/softirq.c:423 sysvec_apic_timer_interrupt+0x74/0x90 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 write to 0xffff88812997ea48 of 4 bytes by interrupt 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_expired_send_persistent_keepalive+0x38/0x50 drivers/net/wireguard/timers.c:141 call_timer_fn+0x2e/0x240 kernel/time/timer.c:1410 expire_timers+0x116/0x260 kernel/time/timer.c:1455 __run_timers+0x328/0x3c0 kernel/time/timer.c:1747 run_timer_softirq+0x19/0x30 kernel/time/timer.c:1760 __do_softirq+0x12c/0x2b1 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x32/0x40 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu+0xb2/0xc0 kernel/softirq.c:423 sysvec_apic_timer_interrupt+0x74/0x90 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline] acpi_idle_do_entry drivers/acpi/processor_idle.c:517 [inline] acpi_idle_enter+0x25b/0x2e0 drivers/acpi/processor_idle.c:648 cpuidle_enter_state+0x2bd/0x750 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x3c/0x60 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:132 [inline] cpuidle_idle_call kernel/sched/idle.c:213 [inline] do_idle+0x193/0x230 kernel/sched/idle.c:273 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:369 rest_init+0xd7/0xe0 init/main.c:721 arch_call_rest_init+0xa/0xb start_kernel+0x5a0/0x625 init/main.c:1061 secondary_startup_64_no_verify+0xb0/0xbb Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================