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BUG: KCSAN: data-race in __perf_event_overflow / fasync_remove_entry

write to 0xffff88809ad4af00 of 8 bytes by task 4554 on cpu 1:
 fasync_remove_entry+0xb7/0x120 fs/fcntl.c:882
 fasync_helper+0xc9/0xd6 fs/fcntl.c:981
 perf_fasync+0x64/0x90 kernel/events/core.c:6011
 __fput+0x448/0x4f0 fs/file_table.c:277
 ____fput+0x1b/0x30 fs/file_table.c:313
 task_work_run+0xf5/0x130 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2ae/0x2c0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x36e/0x390 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88809ad4af00 of 8 bytes by interrupt on cpu 0:
 __perf_event_overflow+0x116/0x200 kernel/events/core.c:8438
 perf_swevent_hrtimer+0x261/0x280 kernel/events/core.c:9822
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x271/0x600 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x226/0x490 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline]
 smp_apic_timer_interrupt+0xd8/0x270 arch/x86/kernel/apic/apic.c:1144
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 jhash2 include/linux/jhash.h:128 [inline]
 hash_futex+0x73/0x150 kernel/futex.c:388
 queue_lock kernel/futex.c:2304 [inline]
 futex_wait_setup+0xad/0x210 kernel/futex.c:2757
 futex_wait+0x14a/0x400 kernel/futex.c:2806
 do_futex+0xe2/0x1820 kernel/futex.c:3882
 __do_sys_futex kernel/futex.c:3943 [inline]
 __se_sys_futex kernel/futex.c:3911 [inline]
 __x64_sys_futex+0x2dc/0x410 kernel/futex.c:3911
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4676 Comm: syz-executor.4 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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