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BUG: KCSAN: data-race in __perf_event_overflow / fasync_remove_entry

read to 0xffff888119ea52f8 of 8 bytes by interrupt on cpu 1:
 __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
 ip_mtu_locked include/net/ip.h:408 [inline]
 ip_mtu_locked include/net/ip.h:404 [inline]
 ipv4_mtu net/ipv4/route.c:1315 [inline]
 ipv4_mtu+0x212/0x250 net/ipv4/route.c:1302
 dst_mtu include/net/dst.h:199 [inline]
 sctp_dst_mtu include/net/sctp/sctp.h:592 [inline]
 sctp_transport_pmtu+0xc3/0x260 net/sctp/transport.c:241
 sctp_transport_route+0xfe/0x1e0 net/sctp/transport.c:304
 sctp_assoc_add_peer+0x322/0x7f0 net/sctp/associola.c:652
 sctp_process_param net/sctp/sm_make_chunk.c:2524 [inline]
 sctp_process_init+0xc10/0x1620 net/sctp/sm_make_chunk.c:2345
 sctp_sf_do_unexpected_init net/sctp/sm_statefuns.c:1541 [inline]
 sctp_sf_do_unexpected_init.isra.0+0x549/0xa70 net/sctp/sm_statefuns.c:1441
 sctp_sf_do_5_2_1_siminit+0x3e/0x60 net/sctp/sm_statefuns.c:1670
 sctp_do_sm+0xc2/0x2ef0 net/sctp/sm_sideeffect.c:1152
 sctp_assoc_bh_rcv+0x291/0x3e0 net/sctp/associola.c:1048
 sctp_inq_push+0x107/0x1a0 net/sctp/inqueue.c:80
 sctp_backlog_rcv+0x112/0x7a0 net/sctp/input.c:344
 sk_backlog_rcv include/net/sock.h:950 [inline]
 __release_sock+0x135/0x1e0 net/core/sock.c:2439
 release_sock+0x61/0x160 net/core/sock.c:2955
 sctp_wait_for_connect+0x21c/0x330 net/sctp/socket.c:9167
 __sctp_connect+0x5af/0x670 net/sctp/socket.c:1226
 sctp_connect net/sctp/socket.c:4841 [inline]
 sctp_inet_connect+0xd7/0x120 net/sctp/socket.c:4856
 __sys_connect+0x1e9/0x250 net/socket.c:1828
 __do_sys_connect net/socket.c:1839 [inline]
 __se_sys_connect net/socket.c:1836 [inline]
 __x64_sys_connect+0x4c/0x60 net/socket.c:1836
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff888119ea52f8 of 8 bytes by task 8088 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: 8088 Comm: syz-executor.4 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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