usb 2-1: USB disconnect, device number 6 ===================================================== BUG: KMSAN: uninit-value in __mutex_lock_slowpath+0x2c/0x30 kernel/locking/mutex.c:1338 CPU: 0 PID: 11917 Comm: kworker/0:4 Not tainted 5.3.0-rc7+ #0 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+0x13a/0x2b0 mm/kmsan/kmsan_report.c:108 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250 mutex_optimistic_spin kernel/locking/mutex.c:623 [inline] __mutex_lock_common kernel/locking/mutex.c:933 [inline] __mutex_lock+0x18fc/0x1980 kernel/locking/mutex.c:1077 __mutex_lock_slowpath+0x2c/0x30 kernel/locking/mutex.c:1338 mutex_lock+0x5d/0x80 kernel/locking/mutex.c:258 iowarrior_disconnect+0x133/0x3e0 drivers/usb/misc/iowarrior.c:878 usb_unbind_interface+0x3a2/0xdd0 drivers/usb/core/driver.c:423 __device_release_driver drivers/base/dd.c:1120 [inline] device_release_driver_internal+0x911/0xd20 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:2339 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:150 [inline] kmsan_internal_poison_shadow+0x53/0x100 mm/kmsan/kmsan.c:134 kmsan_slab_free+0x8d/0x100 mm/kmsan/kmsan_hooks.c:123 slab_free_freelist_hook mm/slub.c:1472 [inline] slab_free mm/slub.c:3038 [inline] kfree+0x4c1/0x2db0 mm/slub.c:3980 device_release+0xfb/0x380 drivers/base/core.c:1068 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 drivers/base/core.c:2264 [inline] device_unregister+0x63/0x80 drivers/base/core.c:2372 usb_remove_ep_devs+0x7e/0xe0 drivers/usb/core/endpoint.c:215 remove_intf_ep_devs drivers/usb/core/message.c:1116 [inline] usb_disable_device+0x41a/0x1150 drivers/usb/core/message.c:1240 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 =====================================================