==================================================================
BUG: KCSAN: data-race in fasync_remove_entry / perf_swevent_hrtimer

write to 0xffff8880a306f300 of 8 bytes by task 15472 on cpu 0:
 fasync_remove_entry+0xd5/0x140 fs/fcntl.c:884
 fasync_helper+0x92/0xc0 fs/fcntl.c:983
 perf_fasync+0x5a/0x80 kernel/events/core.c:6190
 __fput+0x420/0x460 fs/file_table.c:278
 ____fput+0x11/0x20 fs/file_table.c:314
 task_work_run+0x8e/0x110 kernel/task_work.c:123
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:216 [inline]
 __prepare_exit_to_usermode+0x1c6/0x230 arch/x86/entry/common.c:246
 __syscall_return_slowpath+0x47/0x60 arch/x86/entry/common.c:329
 do_syscall_64+0x5d/0xb0 arch/x86/entry/common.c:368
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880a306f300 of 8 bytes by interrupt on cpu 1:
 __perf_event_overflow kernel/events/core.c:8748 [inline]
 perf_swevent_hrtimer+0x378/0x4a0 kernel/events/core.c:10130
 __run_hrtimer+0x154/0x4b0 kernel/time/hrtimer.c:1520
 __hrtimer_run_queues kernel/time/hrtimer.c:1584 [inline]
 hrtimer_interrupt+0x37c/0xa40 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0xa3/0x280 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_apic_timer_interrupt+0x80/0xd0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596
 outb arch/x86/include/asm/io.h:334 [inline]
 outb_p arch/x86/include/asm/io.h:334 [inline]
 vga_io_w include/video/vga.h:209 [inline]
 setop drivers/video/fbdev/vga16fb.c:150 [inline]
 vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1162 [inline]
 vga16fb_imageblit+0x61a/0xff0 drivers/video/fbdev/vga16fb.c:1260
 bit_putcs+0xe20/0xed0 drivers/video/fbdev/core/bitblit.c:86
 fbcon_putcs+0x5d1/0x5f0 drivers/video/fbdev/core/fbcon.c:1362
 fbcon_redraw+0x25e/0x310 drivers/video/fbdev/core/fbcon.c:1840
 fbcon_scroll+0x672/0x3190 drivers/video/fbdev/core/fbcon.c:1978
 con_scroll+0x3cb/0x4e0 drivers/tty/vt/vt.c:637
 lf drivers/tty/vt/vt.c:1483 [inline]
 do_con_write+0x15c9/0x6b10 drivers/tty/vt/vt.c:2781
 con_write+0x20/0x40 drivers/tty/vt/vt.c:3159
 process_output_block drivers/tty/n_tty.c:595 [inline]
 n_tty_write+0x743/0xae0 drivers/tty/n_tty.c:2333
 do_tty_write drivers/tty/tty_io.c:962 [inline]
 tty_write+0x3fc/0x5e0 drivers/tty/tty_io.c:1046
 __vfs_write+0x69/0x340 fs/read_write.c:495
 vfs_write+0x19b/0x350 fs/read_write.c:559
 ksys_write+0xce/0x180 fs/read_write.c:612
 __do_sys_write fs/read_write.c:624 [inline]
 __se_sys_write fs/read_write.c:621 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:621
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 15477 Comm: syz-executor.5 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================