syzbot

usb 1-1: USB disconnect, device number 2
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BUG: KMSAN: uninit-value in __device_release_driver drivers/base/dd.c:1089 [inline]
BUG: KMSAN: uninit-value in device_release_driver_internal+0x5ee/0xd20 drivers/base/dd.c:1151
CPU: 1 PID: 49 Comm: kworker/1:1 Not tainted 5.3.0-rc3+ #17
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x162/0x2d0 mm/kmsan/kmsan_report.c:109
 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:294
 __device_release_driver drivers/base/dd.c:1089 [inline]
 device_release_driver_internal+0x5ee/0xd20 drivers/base/dd.c:1151
 device_release_driver+0x4b/0x60 drivers/base/dd.c:1174
 bus_remove_device+0x4bf/0x670 drivers/base/bus.c:556
 device_del+0xcd5/0x1d10 drivers/base/core.c:2288
 usb_disable_device+0x567/0x1150 drivers/usb/core/message.c:1241
 usb_disconnect+0x51e/0xd60 drivers/usb/core/hub.c:2199
 hub_port_connect drivers/usb/core/hub.c:4949 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
 port_event drivers/usb/core/hub.c:5359 [inline]
 hub_event+0x3fd0/0x72f0 drivers/usb/core/hub.c:5441
 process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269
 worker_thread+0x111b/0x2460 kernel/workqueue.c:2415
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:187 [inline]
 kmsan_internal_poison_shadow+0x53/0xa0 mm/kmsan/kmsan.c:146
 kmsan_slab_free+0x8d/0x100 mm/kmsan/kmsan_hooks.c:195
 slab_free_freelist_hook mm/slub.c:1472 [inline]
 slab_free mm/slub.c:3038 [inline]
 kfree+0x4c1/0x2db0 mm/slub.c:3980
 usb_release_interface+0x105/0x120 drivers/usb/core/message.c:1633
 device_release+0xe2/0x380 drivers/base/core.c:1060
 kobject_cleanup lib/kobject.c:693 [inline]
 kobject_release lib/kobject.c:722 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x38d/0x480 lib/kobject.c:739
 put_device+0x51/0x70 drivers/base/core.c:2213
 klist_devices_put+0x50/0x70 drivers/base/bus.c:797
 klist_put lib/klist.c:221 [inline]
 klist_del+0x1fe/0x2f0 lib/klist.c:230
 bus_remove_device+0x4a0/0x670 drivers/base/bus.c:552
 device_del+0xcd5/0x1d10 drivers/base/core.c:2288
 usb_disable_device+0x567/0x1150 drivers/usb/core/message.c:1241
 usb_disconnect+0x51e/0xd60 drivers/usb/core/hub.c:2199
 hub_port_connect drivers/usb/core/hub.c:4949 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
 port_event drivers/usb/core/hub.c:5359 [inline]
 hub_event+0x3fd0/0x72f0 drivers/usb/core/hub.c:5441
 process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269
 worker_thread+0x111b/0x2460 kernel/workqueue.c:2415
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355
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