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

write to 0xffff88808aeffb00 of 8 bytes by task 12382 on cpu 1:
 fasync_remove_entry+0xb7/0x120 fs/fcntl.c:882
 fasync_helper+0xc9/0xd6 fs/fcntl.c:981
 perf_fasync+0x64/0x90 kernel/events/core.c:6011
 __fput+0x448/0x4f0 fs/file_table.c:277
 ____fput+0x1b/0x30 fs/file_table.c:313
 task_work_run+0xf5/0x130 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2ae/0x2c0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x36e/0x390 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88808aeffb00 of 8 bytes by interrupt on cpu 0:
 kill_fasync+0x3c/0x170 fs/fcntl.c:1019
 perf_event_wakeup+0x115/0x160 kernel/events/core.c:6051
 perf_pending_event+0x129/0x170 kernel/events/core.c:6107
 irq_work_run_list+0x13e/0x190 kernel/irq_work.c:156
 irq_work_run+0x43/0x90 kernel/irq_work.c:172
 smp_irq_work_interrupt+0x3b/0xf0 arch/x86/kernel/irq_work.c:21
 irq_work_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:860
 vsscanf+0x16/0x1410 lib/vsprintf.c:3189
 sscanf+0x6c/0xa0 lib/vsprintf.c:3481
 __dev_alloc_name net/core/dev.c:1111 [inline]
 dev_alloc_name_ns+0x16d/0x390 net/core/dev.c:1145
 dev_get_valid_name+0x71/0xf0 net/core/dev.c:1180
 register_netdevice+0xf6/0xad0 net/core/dev.c:9299
 bond_newlink drivers/net/bonding/bond_netlink.c:458 [inline]
 bond_newlink+0x51/0xa0 drivers/net/bonding/bond_netlink.c:448
 __rtnl_newlink+0xbe5/0xfb0 net/core/rtnetlink.c:3319
 rtnl_newlink+0x5f/0x90 net/core/rtnetlink.c:3377
 rtnetlink_rcv_msg+0x1d0/0x4e0 net/core/rtnetlink.c:5438
 netlink_rcv_skb+0xaf/0x260 net/netlink/af_netlink.c:2477
 rtnetlink_rcv+0x22/0x30 net/core/rtnetlink.c:5456
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x390/0x4c0 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x4cf/0x8a0 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0x98/0xc0 net/socket.c:672
 ____sys_sendmsg+0x493/0x4c0 net/socket.c:2343
 ___sys_sendmsg+0xb5/0x100 net/socket.c:2397
 __sys_sendmsg+0x9b/0x150 net/socket.c:2430
 __do_sys_sendmsg net/socket.c:2439 [inline]
 __se_sys_sendmsg net/socket.c:2437 [inline]
 __x64_sys_sendmsg+0x4c/0x60 net/socket.c:2437
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12402 Comm: syz-executor.5 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================