Hi! I've got the following report while fuzzing the kernel with syzkaller. On commit 3e0cc09a3a2c40ec1ffb6b4e12da86e98feccb11 (4.14-rc5+). usb 1-1: New USB device found, idVendor=2040, idProduct=c602 usb 1-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0 usb 1-1: Product: a usb 1-1: dvb_usb_v2: found a 'HCW 126xxx' in warm state usb 1-1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer dvbdev: DVB: registering new adapter (HCW 126xxx) usb 1-1: media controller created dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered. usb 1-1: selecting invalid altsetting 1 set interface failed INFO: trying to register non-static key. the code is fine but needs lockdep annotation. turning off the locking correctness validator. CPU: 0 PID: 24 Comm: kworker/0:1 Not tainted 4.14.0-rc5-43687-g06ab8a23e0e6 #545 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:16 dump_stack+0x292/0x395 lib/dump_stack.c:52 register_lock_class+0x6c4/0x1a00 kernel/locking/lockdep.c:769 __lock_acquire+0x244/0x3610 kernel/locking/lockdep.c:3377 lock_acquire+0x259/0x620 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 __mutex_lock+0x18e/0x1a60 kernel/locking/mutex.c:893 mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:908 mxl111sf_ctrl_msg+0x93/0x1f0 drivers/media/usb/dvb-usb-v2/mxl111sf.c:69 mxl111sf_write_reg+0xc9/0x170 drivers/media/usb/dvb-usb-v2/mxl111sf.c:126 mxl1x1sf_soft_reset+0x69/0x1a0 drivers/media/usb/dvb-usb-v2/mxl111sf-phy.c:56 mxl111sf_lg2160_frontend_attach+0x27b/0x9e0 drivers/media/usb/dvb-usb-v2/mxl111sf.c:521 mxl111sf_frontend_attach_mh+0x1c/0x20 drivers/media/usb/dvb-usb-v2/mxl111sf.c:977 dvb_usbv2_adapter_frontend_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:655 dvb_usbv2_adapter_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:818 dvb_usbv2_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:881 dvb_usbv2_probe+0x143d/0x32f0 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:992 usb_probe_interface+0x35d/0x8e0 drivers/usb/core/driver.c:361 really_probe drivers/base/dd.c:413 driver_probe_device+0x610/0xa00 drivers/base/dd.c:557 __device_attach_driver+0x230/0x290 drivers/base/dd.c:653 bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463 __device_attach+0x26b/0x3c0 drivers/base/dd.c:710 device_initial_probe+0x1f/0x30 drivers/base/dd.c:757 bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523 device_add+0xd0b/0x1660 drivers/base/core.c:1835 usb_set_configuration+0x104e/0x1870 drivers/usb/core/message.c:1932 generic_probe+0x73/0xe0 drivers/usb/core/generic.c:174 usb_probe_device+0xaf/0xe0 drivers/usb/core/driver.c:266 really_probe drivers/base/dd.c:413 driver_probe_device+0x610/0xa00 drivers/base/dd.c:557 __device_attach_driver+0x230/0x290 drivers/base/dd.c:653 bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463 __device_attach+0x26b/0x3c0 drivers/base/dd.c:710 device_initial_probe+0x1f/0x30 drivers/base/dd.c:757 bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523 device_add+0xd0b/0x1660 drivers/base/core.c:1835 usb_new_device+0x7b8/0x1020 drivers/usb/core/hub.c:2457 hub_port_connect drivers/usb/core/hub.c:4903 hub_port_connect_change drivers/usb/core/hub.c:5009 port_event drivers/usb/core/hub.c:5115 hub_event+0x194d/0x3740 drivers/usb/core/hub.c:5195 process_one_work+0xc73/0x1d90 kernel/workqueue.c:2119 worker_thread+0x221/0x1850 kernel/workqueue.c:2253 kthread+0x363/0x440 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 usb 1-1: dvb_usb_v2: usb_bulk_msg() failed=-22 error writing reg: 0xff, val: 0x00 dvb_usb_mxl111sf: probe of 1-1:1.0 failed with error -22
