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BUG: KCSAN: data-race in fasync_remove_entry / kill_fasync

write to 0xffff8880a546c700 of 8 bytes by task 18255 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 0xffff8880a546c700 of 8 bytes by interrupt on cpu 1:
 kill_fasync+0x1e/0x160 fs/fcntl.c:1021
 perf_event_wakeup kernel/events/core.c:6230 [inline]
 perf_pending_event+0x258/0x300 kernel/events/core.c:6286
 irq_work_single kernel/irq_work.c:148 [inline]
 irq_work_run_list kernel/irq_work.c:170 [inline]
 irq_work_run+0xf7/0x2c0 kernel/irq_work.c:179
 __sysvec_irq_work+0x22/0xd0 arch/x86/kernel/irq_work.c:22
 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_irq_work+0x8f/0xe0 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:626
 neigh_flush_dev+0x4a0/0x550 include/linux/refcount.h:274
 __neigh_ifdown+0x39/0x2b0 net/core/neighbour.c:352
 neigh_ifdown+0x1b/0x30 net/core/neighbour.c:369
 rt6_disable_ip+0x3f2/0x420 net/ipv6/route.c:4782
 addrconf_ifdown+0x9e/0xe40 net/ipv6/addrconf.c:3677
 addrconf_notify+0x2a2/0x1e30 net/ipv6/addrconf.c:3602
 notifier_call_chain kernel/notifier.c:83 [inline]
 __raw_notifier_call_chain kernel/notifier.c:361 [inline]
 raw_notifier_call_chain+0x53/0xb0 kernel/notifier.c:368
 call_netdevice_notifiers_info net/core/dev.c:2027 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
 call_netdevice_notifiers net/core/dev.c:2053 [inline]
 dev_close_many+0x1ff/0x310 net/core/dev.c:1628
 dev_close+0xc2/0x130 net/core/dev.c:1650
 team_port_add drivers/net/team/team.c:1305 [inline]
 team_add_slave+0xff9/0x16f0 drivers/net/team/team.c:1967
 do_set_master net/core/rtnetlink.c:2476 [inline]
 do_setlink+0x8a6/0x2010 net/core/rtnetlink.c:2611
 rtnl_setlink+0x227/0x270 net/core/rtnetlink.c:2902
 rtnetlink_rcv_msg+0x71b/0x7b0 net/core/rtnetlink.c:5460
 netlink_rcv_skb+0x13e/0x240 net/netlink/af_netlink.c:2469
 rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:5478
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x5e2/0x6b0 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x6d8/0x7a0 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2352
 ___sys_sendmsg net/socket.c:2406 [inline]
 __sys_sendmsg+0x1df/0x260 net/socket.c:2439
 __do_sys_sendmsg net/socket.c:2448 [inline]
 __se_sys_sendmsg net/socket.c:2446 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2446
 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: 18259 Comm: syz-executor.0 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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