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BUG: KCSAN: data-race in wg_packet_send_staged_packets / wg_packet_send_staged_packets

write to 0xffff8880a5d7fa08 of 4 bytes by interrupt on cpu 0:
 wg_cpumask_next_online drivers/net/wireguard/queueing.h:141 [inline]
 wg_queue_enqueue_per_device_and_peer drivers/net/wireguard/queueing.h:160 [inline]
 wg_packet_create_data drivers/net/wireguard/send.c:321 [inline]
 wg_packet_send_staged_packets+0x8dd/0xd90 drivers/net/wireguard/send.c:393
 wg_packet_send_keepalive+0x3f/0x140 drivers/net/wireguard/send.c:237
 wg_expired_send_persistent_keepalive+0x43/0x50 drivers/net/wireguard/timers.c:141
 call_timer_fn+0x58/0x2e0 kernel/time/timer.c:1405
 expire_timers kernel/time/timer.c:1450 [inline]
 __run_timers kernel/time/timer.c:1774 [inline]
 __run_timers kernel/time/timer.c:1741 [inline]
 run_timer_softirq+0xb14/0xbd0 kernel/time/timer.c:1787
 __do_softirq+0x118/0x34a kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0xb5/0xd0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:546 [inline]
 smp_apic_timer_interrupt+0xe2/0x270 arch/x86/kernel/apic/apic.c:1140
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 get_current arch/x86/include/asm/current.h:15 [inline]
 __sanitizer_cov_trace_pc+0x9/0x50 kernel/kcov.c:186
 set_pte_at arch/x86/include/asm/paravirt.h:453 [inline]
 copy_one_pte mm/memory.c:810 [inline]
 copy_pte_range mm/memory.c:853 [inline]
 copy_pmd_range mm/memory.c:904 [inline]
 copy_pud_range mm/memory.c:938 [inline]
 copy_p4d_range mm/memory.c:960 [inline]
 copy_page_range+0xbb6/0x1a50 mm/memory.c:1022
 dup_mmap kernel/fork.c:607 [inline]
 dup_mm+0x6db/0xb50 kernel/fork.c:1363
 copy_mm kernel/fork.c:1419 [inline]
 copy_process+0x394f/0x3ab0 kernel/fork.c:2085
 _do_fork+0xf7/0x790 kernel/fork.c:2430
 __do_sys_clone+0xf9/0x130 kernel/fork.c:2585
 __se_sys_clone kernel/fork.c:2566 [inline]
 __x64_sys_clone+0x6c/0x80 kernel/fork.c:2566
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880a5d7fa08 of 4 bytes by interrupt on cpu 1:
 wg_cpumask_next_online drivers/net/wireguard/queueing.h:137 [inline]
 wg_queue_enqueue_per_device_and_peer drivers/net/wireguard/queueing.h:160 [inline]
 wg_packet_create_data drivers/net/wireguard/send.c:321 [inline]
 wg_packet_send_staged_packets+0x88c/0xd90 drivers/net/wireguard/send.c:393
 wg_packet_send_keepalive+0x3f/0x140 drivers/net/wireguard/send.c:237
 wg_expired_send_persistent_keepalive+0x43/0x50 drivers/net/wireguard/timers.c:141
 call_timer_fn+0x58/0x2e0 kernel/time/timer.c:1405
 expire_timers kernel/time/timer.c:1450 [inline]
 __run_timers kernel/time/timer.c:1774 [inline]
 __run_timers kernel/time/timer.c:1741 [inline]
 run_timer_softirq+0xb14/0xbd0 kernel/time/timer.c:1787
 __do_softirq+0x118/0x34a kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0xb5/0xd0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:546 [inline]
 smp_apic_timer_interrupt+0xe2/0x270 arch/x86/kernel/apic/apic.c:1140
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 matching_access kernel/kcsan/encoding.h:90 [inline]
 find_watchpoint kernel/kcsan/core.c:127 [inline]
 check_access kernel/kcsan/core.c:566 [inline]
 __tsan_unaligned_write8+0x30/0x110 kernel/kcsan/core.c:770
 __tlb_remove_page_size+0x63/0x1b0 mm/mmu_gather.c:81
 __tlb_remove_page include/asm-generic/tlb.h:439 [inline]
 zap_pte_range mm/memory.c:1095 [inline]
 zap_pmd_range mm/memory.c:1196 [inline]
 zap_pud_range mm/memory.c:1225 [inline]
 zap_p4d_range mm/memory.c:1246 [inline]
 unmap_page_range+0xb7f/0x1c50 mm/memory.c:1267
 unmap_single_vma+0x13c/0x1f0 mm/memory.c:1312
 unmap_vmas+0xe2/0x1b0 mm/memory.c:1344
 exit_mmap+0x13e/0x2f0 mm/mmap.c:3150
 __mmput kernel/fork.c:1085 [inline]
 mmput+0xe2/0x260 kernel/fork.c:1106
 exit_mm kernel/exit.c:479 [inline]
 do_exit+0x644/0x11e0 kernel/exit.c:782
 do_group_exit+0xae/0x1a0 kernel/exit.c:893
 get_signal+0x2a7/0x1290 kernel/signal.c:2739
 do_signal+0x2b/0x840 arch/x86/kernel/signal.c:784
 exit_to_usermode_loop+0x24a/0x2c0 arch/x86/entry/common.c:161
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:279 [inline]
 do_syscall_64+0x38b/0x3b0 arch/x86/entry/common.c:305
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10901 Comm: syz-executor.5 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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