tc90522 0-0018: Toshiba TC90522 attached. usb 6-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)... dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered. ============================================ WARNING: possible recursive locking detected 5.8.0-rc3-syzkaller #0 Not tainted -------------------------------------------- kworker/0:4/3039 is trying to acquire lock: ffff8881c4e38230 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_lock_bus include/linux/i2c.h:757 [inline] ffff8881c4e38230 (i2c_register_adapter){+.+.}-{0:0}, at: __i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline] ffff8881c4e38230 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_transfer+0x1d3/0x3e0 drivers/i2c/i2c-core-base.c:1978 but task is already holding lock: ffff8881d2b5a5c8 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_lock_bus include/linux/i2c.h:757 [inline] ffff8881d2b5a5c8 (i2c_register_adapter){+.+.}-{0:0}, at: __i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline] ffff8881d2b5a5c8 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_transfer+0x1d3/0x3e0 drivers/i2c/i2c-core-base.c:1978 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(i2c_register_adapter); lock(i2c_register_adapter); *** DEADLOCK *** May be due to missing lock nesting notation 7 locks held by kworker/0:4/3039: #0: ffff8881d8866538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8881d8866538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8881d8866538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8881d8866538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8881d8866538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8881d8866538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x82b/0x15f0 kernel/workqueue.c:2240 #1: ffff8881aa81fda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x85f/0x15f0 kernel/workqueue.c:2244 #2: ffff8881d4502218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline] #2: ffff8881d4502218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c5/0x4390 drivers/usb/core/hub.c:5522 #3: ffff8881d55fb218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline] #3: ffff8881d55fb218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x430 drivers/base/dd.c:850 #4: ffff8881c986c1a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline] #4: ffff8881c986c1a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x430 drivers/base/dd.c:850 #5: ffff8881d9bfb198 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline] #5: ffff8881d9bfb198 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x430 drivers/base/dd.c:850 #6: ffff8881d2b5a5c8 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_lock_bus include/linux/i2c.h:757 [inline] #6: ffff8881d2b5a5c8 (i2c_register_adapter){+.+.}-{0:0}, at: __i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline] #6: ffff8881d2b5a5c8 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_transfer+0x1d3/0x3e0 drivers/i2c/i2c-core-base.c:1978 stack backtrace: CPU: 0 PID: 3039 Comm: kworker/0:4 Not tainted 5.8.0-rc3-syzkaller #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+0xf6/0x16e lib/dump_stack.c:118 print_deadlock_bug kernel/locking/lockdep.c:2391 [inline] check_deadlock kernel/locking/lockdep.c:2432 [inline] validate_chain kernel/locking/lockdep.c:3202 [inline] __lock_acquire.cold+0x162/0x3f8 kernel/locking/lockdep.c:4380 lock_acquire+0x183/0x940 kernel/locking/lockdep.c:4959 __rt_mutex_lock kernel/locking/rtmutex.c:1469 [inline] rt_mutex_lock_nested+0x41/0x60 kernel/locking/rtmutex.c:1482 i2c_lock_bus include/linux/i2c.h:757 [inline] __i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline] i2c_transfer+0x1d3/0x3e0 drivers/i2c/i2c-core-base.c:1978 tc90522_master_xfer.part.0+0x67d/0xc10 drivers/media/dvb-frontends/tc90522.c:708 tc90522_master_xfer+0x35/0x50 drivers/media/dvb-frontends/tc90522.c:643 __i2c_transfer+0x52e/0x1850 drivers/i2c/i2c-core-base.c:1921 i2c_transfer+0x1e6/0x3e0 drivers/i2c/i2c-core-base.c:1982 dvb_pll_attach+0x22c/0x900 drivers/media/dvb-frontends/dvb-pll.c:816 dvb_pll_probe+0x101/0x16c drivers/media/dvb-frontends/dvb-pll.c:884 i2c_device_probe+0x6d1/0x970 drivers/i2c/i2c-core-base.c:402 really_probe+0x291/0xc90 drivers/base/dd.c:525 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:701 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:807 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x28d/0x430 drivers/base/dd.c:873 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb09/0x1b40 drivers/base/core.c:2680 i2c_new_client_device+0x58c/0xa60 drivers/i2c/i2c-core-base.c:794 dvb_module_probe+0xf9/0x240 drivers/media/dvb-core/dvbdev.c:987 friio_tuner_attach+0x12b/0x1d0 drivers/media/usb/dvb-usb-v2/gl861.c:457 dvb_usbv2_adapter_frontend_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:676 [inline] dvb_usbv2_adapter_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:805 [inline] dvb_usbv2_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:866 [inline] dvb_usbv2_probe.cold+0x2f4d/0x308b drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:981 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:374 really_probe+0x291/0xc90 drivers/base/dd.c:525 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:701 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:807 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x28d/0x430 drivers/base/dd.c:873 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb09/0x1b40 drivers/base/core.c:2680 usb_set_configuration+0xf05/0x18a0 drivers/usb/core/message.c:2032 usb_generic_driver_probe+0xba/0xf2 drivers/usb/core/generic.c:241 usb_probe_device+0xd9/0x250 drivers/usb/core/driver.c:272 really_probe+0x291/0xc90 drivers/base/dd.c:525 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:701 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:807 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x28d/0x430 drivers/base/dd.c:873 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb09/0x1b40 drivers/base/core.c:2680 usb_new_device.cold+0x71d/0xfd4 drivers/usb/core/hub.c:2554 hub_port_connect drivers/usb/core/hub.c:5208 [inline] hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] port_event drivers/usb/core/hub.c:5494 [inline] hub_event+0x2361/0x4390 drivers/usb/core/hub.c:5576 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x392/0x470 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 dvb_pll: probe of 1-0060 failed with error -12 usb 6-1: USB disconnect, device number 55 usb 6-1: new high-speed USB device number 56 using dummy_hcd usb 6-1: Using ep0 maxpacket: 8 usb 6-1: config 0 has an invalid descriptor of length 0, skipping remainder of the config usb 6-1: config 0 interface 0 altsetting 0 has an invalid endpoint with address 0x0, skipping usb 6-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor, different from the interface descriptor's value: 9 usb 6-1: New USB device found, idVendor=0926, idProduct=7333, bcdDevice= 0.40 usb 6-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 6-1: config 0 descriptor?? usb 6-1: string descriptor 0 read error: -71 usbhid 6-1:0.0: couldn't find an input interrupt endpoint usb 6-1: USB disconnect, device number 56 usb 5-1: USB disconnect, device number 53 usb 5-1: ath9k_htc: USB layer deinitialized usb 5-1: new high-speed USB device number 54 using dummy_hcd usb 5-1: New USB device found, idVendor=0cf3, idProduct=9271, bcdDevice= 1.08 usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 5-1: Product: syz usb 5-1: Manufacturer: syz usb 5-1: SerialNumber: syz usb 5-1: ath9k_htc: Firmware ath9k_htc/htc_9271-1.4.0.fw requested usb 5-1: ath9k_htc: Transferred FW: ath9k_htc/htc_9271-1.4.0.fw, size: 51008 ath9k_htc 5-1:1.0: ath9k_htc: Target is unresponsive ath9k_htc: Failed to initialize the device