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BUG: KCSAN: data-race in wg_packet_send_staged_packets / wg_packet_send_staged_packets

read to 0xffff888022fd1a48 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
 should_watch kernel/kcsan/core.c:265 [inline]
 check_access kernel/kcsan/core.c:631 [inline]
 __tsan_read8+0x150/0x180 kernel/kcsan/core.c:842
 find_va_links mm/vmalloc.c:551 [inline]
 insert_vmap_area+0x84/0x220 mm/vmalloc.c:707
 alloc_vmap_area+0x1109/0x1280 mm/vmalloc.c:1226
 __get_vm_area_node+0x165/0x240 mm/vmalloc.c:2080
 __vmalloc_node_range+0xb7/0x4f0 mm/vmalloc.c:2553
 alloc_thread_stack_node kernel/fork.c:244 [inline]
 dup_task_struct+0x46d/0x800 kernel/fork.c:864
 copy_process+0x3d1/0x2e70 kernel/fork.c:1938
 kernel_clone+0x14b/0x680 kernel/fork.c:2456
 __do_sys_clone kernel/fork.c:2573 [inline]
 __se_sys_clone kernel/fork.c:2557 [inline]
 __x64_sys_clone+0xc8/0xf0 kernel/fork.c:2557
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff888022fd1a48 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
 write_comp_data kernel/kcov.c:240 [inline]
 __sanitizer_cov_trace_const_cmp8+0x8c/0x90 kernel/kcov.c:291
 compound_head include/linux/page-flags.h:187 [inline]
 PageAnon include/linux/page-flags.h:484 [inline]
 page_remove_rmap+0x3d/0x2f0 mm/rmap.c:1330
 zap_pte_range+0x5af/0x13c0 mm/memory.c:1253
 zap_pmd_range mm/memory.c:1357 [inline]
 zap_pud_range mm/memory.c:1386 [inline]
 zap_p4d_range mm/memory.c:1407 [inline]
 unmap_page_range+0x560/0x660 mm/memory.c:1428
 unmap_single_vma+0x157/0x210 mm/memory.c:1473
 unmap_vmas+0xbf/0x150 mm/memory.c:1505
 exit_mmap+0x1c7/0x3b0 mm/mmap.c:3222
 __mmput+0xa2/0x220 kernel/fork.c:1079
 mmput+0x38/0x40 kernel/fork.c:1100
 exit_mm+0x2bd/0x320 kernel/exit.c:483
 do_exit+0x3c2/0x15a0 kernel/exit.c:793
 do_group_exit+0xc8/0x170 kernel/exit.c:903
 get_signal+0xf9b/0x1510 kernel/signal.c:2758
 arch_do_signal+0x25/0x260 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
 exit_to_user_mode_prepare+0xde/0x170 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:266
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22473 Comm: syz-executor.1 Not tainted 5.10.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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