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BUG: KCSAN: data-race in __perf_event_overflow / fasync_remove_entry

write to 0xffff8880a3c8eb00 of 8 bytes by task 18959 on cpu 1:
 fasync_remove_entry+0xb7/0x120 fs/fcntl.c:884
 fasync_helper+0xc9/0xd6 fs/fcntl.c:983
 perf_fasync+0x64/0x90 kernel/events/core.c:6187
 __fput+0x455/0x500 fs/file_table.c:277
 ____fput+0x1b/0x30 fs/file_table.c:313
 task_work_run+0xba/0x120 kernel/task_work.c:123
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2ae/0x2c0 arch/x86/entry/common.c:165
 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

read to 0xffff8880a3c8eb00 of 8 bytes by interrupt on cpu 0:
 __perf_event_overflow+0x116/0x200 kernel/events/core.c:8738
 perf_swevent_hrtimer+0x261/0x280 kernel/events/core.c:10120
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x271/0x600 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x226/0x490 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline]
 smp_apic_timer_interrupt+0xd8/0x270 arch/x86/kernel/apic/apic.c:1138
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 __sanitizer_cov_trace_pc+0x3b/0x50 kernel/kcov.c:192
 vmx_read_guest_seg_base+0x63/0x180 arch/x86/kvm/vmx/vmx.c:740
 vmx_get_segment arch/x86/kvm/vmx/vmx.c:3112 [inline]
 vmx_get_segment+0x12a/0x340 arch/x86/kvm/vmx/vmx.c:3098
 kvm_get_segment arch/x86/kvm/x86.c:5343 [inline]
 emulator_get_segment+0x61/0x370 arch/x86/kvm/x86.c:6150
 __linearize arch/x86/kvm/emulate.c:735 [inline]
 __do_insn_fetch_bytes+0xed/0x450 arch/x86/kvm/emulate.c:901
 x86_decode_insn+0xf77/0x2bc0 arch/x86/kvm/emulate.c:5171
 x86_emulate_instruction+0x525/0x11d0 arch/x86/kvm/x86.c:6796
 kvm_mmu_page_fault+0x1c7/0xac0 arch/x86/kvm/mmu/mmu.c:5495
 handle_ept_violation+0x1ce/0x430 arch/x86/kvm/vmx/vmx.c:5196
 vmx_handle_exit+0x1de/0xfe0 arch/x86/kvm/vmx/vmx.c:5980
 vcpu_enter_guest+0xc00/0x3740 arch/x86/kvm/x86.c:8481
 vcpu_run arch/x86/kvm/x86.c:8544 [inline]
 kvm_arch_vcpu_ioctl_run+0x281/0xd60 arch/x86/kvm/x86.c:8766
 kvm_vcpu_ioctl+0x70b/0x9d0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3138
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x101/0x150 fs/ioctl.c:763
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x47/0x60 fs/ioctl.c:770
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 18963 Comm: syz-executor.0 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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