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

read to 0xffff8880a4abd6f8 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
 get_current arch/x86/include/asm/current.h:15 [inline]
 get_ctx kernel/kcsan/core.c:175 [inline]
 is_atomic kernel/kcsan/core.c:180 [inline]
 should_watch kernel/kcsan/core.c:211 [inline]
 check_access kernel/kcsan/core.c:465 [inline]
 __tsan_read4+0xd1/0x100 kernel/kcsan/core.c:595
 reg_copy_dfs_chan_state net/wireless/reg.c:2665 [inline]
 wiphy_share_dfs_chan_state net/wireless/reg.c:2692 [inline]
 wiphy_all_share_dfs_chan_state+0x24c/0x3f0 net/wireless/reg.c:2707
 wiphy_regulatory_register+0xa3/0x150 net/wireless/reg.c:3782
 wiphy_register+0x12f2/0x17d0 net/wireless/core.c:895
 ieee80211_register_hw+0xcb5/0x1ea0 net/mac80211/main.c:1136
 mac80211_hwsim_new_radio+0x12d2/0x1ac0 drivers/net/wireless/mac80211_hwsim.c:3031
 hwsim_new_radio_nl+0x63d/0x890 drivers/net/wireless/mac80211_hwsim.c:3586
 genl_family_rcv_msg+0x4ae/0x9f0 net/netlink/genetlink.c:629
 genl_rcv_msg+0x8f/0x100 net/netlink/genetlink.c:654
 netlink_rcv_skb+0xb0/0x260 net/netlink/af_netlink.c:2477
 genl_rcv+0x32/0x50 net/netlink/genetlink.c:665
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x354/0x430 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x456/0x770 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:637 [inline]
 sock_sendmsg+0x9f/0xc0 net/socket.c:657
 ___sys_sendmsg+0x59d/0x5d0 net/socket.c:2311
 __sys_sendmsg+0xa0/0x160 net/socket.c:2356
 __do_sys_sendmsg net/socket.c:2365 [inline]
 __se_sys_sendmsg net/socket.c:2363 [inline]
 __x64_sys_sendmsg+0x51/0x70 net/socket.c:2363
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8880a4abd6f8 of 8 bytes by task 27626 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: 27626 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
==================================================================