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BUG: KCSAN: data-race in fasync_remove_entry / kill_fasync

read to 0xffff8880a48f26f8 of 8 bytes by interrupt on cpu 1:
 kill_fasync+0x3f/0x180 fs/fcntl.c:1019
 perf_event_wakeup+0x11f/0x160 kernel/events/core.c:5957
 perf_pending_event+0x12d/0x170 kernel/events/core.c:6013
 irq_work_run_list+0xea/0x140 kernel/irq_work.c:165
 irq_work_run+0x48/0xa0 kernel/irq_work.c:180
 smp_irq_work_interrupt+0x3f/0x100 arch/x86/kernel/irq_work.c:21
 irq_work_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:861
 matching_access kernel/kcsan/encoding.h:89 [inline]
 find_watchpoint kernel/kcsan/core.c:106 [inline]
 check_access kernel/kcsan/core.c:453 [inline]
 __tsan_write_range+0x33/0x100 kernel/kcsan/core.c:607
 format_decode+0x2ca/0xb10 lib/vsprintf.c:2320
 vsnprintf+0xc9/0xb40 lib/vsprintf.c:2462
 audit_log_vformat+0x205/0x490 kernel/audit.c:1855
 audit_log_format+0x76/0xb0 kernel/audit.c:1889
 audit_seccomp+0x123/0x1a0 kernel/auditsc.c:2615
 seccomp_log kernel/seccomp.c:674 [inline]
 __seccomp_filter+0x4ce/0xf30 kernel/seccomp.c:874
 __secure_computing+0xb4/0x210 kernel/seccomp.c:937
 syscall_trace_enter+0x215/0x740 arch/x86/entry/common.c:117
 do_syscall_64+0x29d/0x370 arch/x86/entry/common.c:286
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8880a48f26f8 of 8 bytes by task 20600 on cpu 0:
 fasync_remove_entry+0xba/0x120 fs/fcntl.c:882
 fasync_helper+0xcf/0xdc fs/fcntl.c:981
 perf_fasync+0x6c/0xa0 kernel/events/core.c:5917
 __fput+0x46a/0x520 fs/file_table.c:277
 ____fput+0x1f/0x30 fs/file_table.c:313
 task_work_run+0xf6/0x130 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2b4/0x2c0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x353/0x370 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 20600 Comm: syz-executor.1 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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