==================================================================
BUG: KCSAN: data-race in exit_signals / kthread_unpark

write to 0xffff88813952102c of 4 bytes by task 21366 on cpu 0:
 exit_signals+0x118/0x550 kernel/signal.c:2865
 do_exit+0x197/0x15e0 kernel/exit.c:781
 kthread+0x213/0x230 kernel/kthread.c:294
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff88813952102c of 4 bytes by task 3791 on cpu 1:
 to_kthread kernel/kthread.c:83 [inline]
 kthread_unpark+0x1f/0x150 kernel/kthread.c:536
 kthread_stop+0xa6/0x2c0 kernel/kthread.c:619
 usb_stor_release_resources drivers/usb/storage/usb.c:815 [inline]
 release_everything+0x3e/0x150 drivers/usb/storage/usb.c:882
 usb_stor_disconnect+0x119/0x120 drivers/usb/storage/usb.c:1088
 usb_unbind_interface+0x178/0x530 drivers/usb/core/driver.c:458
 __device_release_driver drivers/base/dd.c:1156 [inline]
 device_release_driver_internal+0x348/0x4c0 drivers/base/dd.c:1187
 device_release_driver+0x15/0x20 drivers/base/dd.c:1210
 bus_remove_device+0x1c6/0x210 drivers/base/bus.c:533
 device_del+0x400/0x8f0 drivers/base/core.c:3421
 usb_disable_device+0x224/0x3a0 drivers/usb/core/message.c:1413
 usb_disconnect+0x206/0x4b0 drivers/usb/core/hub.c:2218
 hub_port_connect drivers/usb/core/hub.c:5074 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5363 [inline]
 port_event drivers/usb/core/hub.c:5509 [inline]
 hub_event+0x1371/0x2b60 drivers/usb/core/hub.c:5591
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 process_scheduled_works kernel/workqueue.c:2337 [inline]
 worker_thread+0x7df/0xa70 kernel/workqueue.c:2423
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3791 Comm: kworker/1:2 Not tainted 5.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
==================================================================
usb 5-1: new high-speed USB device number 14 using dummy_hcd
usb 5-1: Using ep0 maxpacket: 8
usb 5-1: config 0 interface 0 altsetting 0 bulk endpoint 0xE has invalid maxpacket 768
usb 5-1: config 0 interface 0 altsetting 0 endpoint 0x82 has invalid wMaxPacketSize 0
usb 5-1: config 0 interface 0 altsetting 0 bulk endpoint 0x82 has invalid maxpacket 0
usb 5-1: New USB device found, idVendor=054c, idProduct=002b, bcdDevice= 1.0b
usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 5-1: config 0 descriptor??
ums-isd200 5-1:0.0: USB Mass Storage device detected
scsi host1: usb-storage 5-1:0.0
usb 5-1: USB disconnect, device number 14
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
bridge0: port 1(bridge_slave_0) entered blocking state
bridge0: port 1(bridge_slave_0) entered forwarding state
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
bridge0: port 2(bridge_slave_1) entered blocking state
bridge0: port 2(bridge_slave_1) entered forwarding state
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bond: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bond: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready