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BUG: KCSAN: data-race in __perf_event_overflow / fasync_remove_entry

write to 0xffff8880a46deef8 of 8 bytes by task 755 on cpu 1:
 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

read to 0xffff8880a46deef8 of 8 bytes by interrupt on cpu 0:
 __perf_event_overflow+0x11d/0x200 kernel/events/core.c:8192
 perf_swevent_hrtimer+0x261/0x280 kernel/events/core.c:9576
 __run_hrtimer kernel/time/hrtimer.c:1514 [inline]
 __hrtimer_run_queues+0x274/0x5f0 kernel/time/hrtimer.c:1576
 hrtimer_interrupt+0x22a/0x480 kernel/time/hrtimer.c:1638
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0xdc/0x280 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 find_watchpoint kernel/kcsan/core.c:106 [inline]
 check_access kernel/kcsan/core.c:453 [inline]
 __tsan_read4+0x65/0x100 kernel/kcsan/core.c:595
 netlink_has_listeners+0x109/0x170 net/netlink/af_netlink.c:1357
 xfrm_acquire_is_on include/net/xfrm.h:1741 [inline]
 xfrm_is_alive+0x7b/0xc0 net/xfrm/xfrm_user.c:3313
 km_is_alive net/xfrm/xfrm_state.c:2254 [inline]
 xfrm_state_find+0x1273/0x27c0 net/xfrm/xfrm_state.c:1109
 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2391 [inline]
 xfrm_tmpl_resolve+0x21e/0x890 net/xfrm/xfrm_policy.c:2436
 xfrm_resolve_and_create_bundle+0x9d/0x12d0 net/xfrm/xfrm_policy.c:2727
 xfrm_lookup_with_ifid+0x1b7/0x1310 net/xfrm/xfrm_policy.c:3050
 xfrm_lookup net/xfrm/xfrm_policy.c:3174 [inline]
 xfrm_lookup_route+0x44/0x100 net/xfrm/xfrm_policy.c:3185
 ip6_dst_lookup_flow+0xde/0x120 net/ipv6/ip6_output.c:1159
 rawv6_sendmsg+0x82c/0x21e0 net/ipv6/raw.c:928
 inet_sendmsg+0x6d/0x90 net/ipv4/af_inet.c:807
 sock_sendmsg_nosec net/socket.c:637 [inline]
 sock_sendmsg+0x9f/0xc0 net/socket.c:657
 ___sys_sendmsg+0x2b7/0x5d0 net/socket.c:2311
 __sys_sendmmsg+0x123/0x350 net/socket.c:2413
 __do_sys_sendmmsg net/socket.c:2442 [inline]
 __se_sys_sendmmsg net/socket.c:2439 [inline]
 __x64_sys_sendmmsg+0x64/0x80 net/socket.c:2439
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 757 Comm: syz-executor.0 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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