tc90522 0-0018: Toshiba TC90522 attached. usb 4-1: 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 5.9.0-rc1-syzkaller #0 Not tainted -------------------------------------------- kworker/1:6/3128 is trying to acquire lock: ffff8881c5cb8230 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_lock_bus include/linux/i2c.h:765 [inline] ffff8881c5cb8230 (i2c_register_adapter){+.+.}-{0:0}, at: __i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline] ffff8881c5cb8230 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_transfer+0x1d3/0x3e0 drivers/i2c/i2c-core-base.c:2106 but task is already holding lock: ffff8881c7d8e5c8 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_lock_bus include/linux/i2c.h:765 [inline] ffff8881c7d8e5c8 (i2c_register_adapter){+.+.}-{0:0}, at: __i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline] ffff8881c7d8e5c8 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_transfer+0x1d3/0x3e0 drivers/i2c/i2c-core-base.c:2106 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/1:6/3128: #0: ffff8881d886a938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8881d886a938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8881d886a938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8881d886a938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8881d886a938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8881d886a938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x82b/0x15f0 kernel/workqueue.c:2240 #1: ffff8881abbc7da8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x85f/0x15f0 kernel/workqueue.c:2244 #2: ffff8881d44df218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:784 [inline] #2: ffff8881d44df218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c5/0x4390 drivers/usb/core/hub.c:5522 #3: ffff8881d9331218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:784 [inline] #3: ffff8881d9331218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:887 #4: ffff8881a90881a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:784 [inline] #4: ffff8881a90881a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:887 #5: ffff8881d928e198 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:784 [inline] #5: ffff8881d928e198 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:887 #6: ffff8881c7d8e5c8 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_lock_bus include/linux/i2c.h:765 [inline] #6: ffff8881c7d8e5c8 (i2c_register_adapter){+.+.}-{0:0}, at: __i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline] #6: ffff8881c7d8e5c8 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_transfer+0x1d3/0x3e0 drivers/i2c/i2c-core-base.c:2106 stack backtrace: CPU: 1 PID: 3128 Comm: kworker/1:6 Not tainted 5.9.0-rc1-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+0x149/0x3a6 kernel/locking/lockdep.c:4426 lock_acquire+0x183/0x950 kernel/locking/lockdep.c:5005 __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:765 [inline] __i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline] i2c_transfer+0x1d3/0x3e0 drivers/i2c/i2c-core-base.c:2106 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:2049 i2c_transfer+0x1e6/0x3e0 drivers/i2c/i2c-core-base.c:2110 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+0x6f4/0x890 drivers/i2c/i2c-core-base.c:528 really_probe+0x291/0xde0 drivers/base/dd.c:553 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:738 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:844 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:912 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb51/0x1c70 drivers/base/core.c:2930 i2c_new_client_device+0x58c/0xa60 drivers/i2c/i2c-core-base.c:920 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+0x291/0xde0 drivers/base/dd.c:553 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:738 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:844 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:912 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb51/0x1c70 drivers/base/core.c:2930 usb_set_configuration+0xf05/0x18a0 drivers/usb/core/message.c:2032 usb_generic_driver_probe+0xba/0xf2 drivers/usb/core/generic.c:239 usb_probe_device+0xd9/0x250 drivers/usb/core/driver.c:272 really_probe+0x291/0xde0 drivers/base/dd.c:553 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:738 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:844 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:912 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb51/0x1c70 drivers/base/core.c:2930 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 process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0x82b/0x1120 kernel/workqueue.c:2417 kthread+0x392/0x470 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 dvb_pll: probe of 1-0060 failed with error -12 usb 4-1: USB disconnect, device number 78 usb 4-1: new high-speed USB device number 79 using dummy_hcd usb 4-1: Using ep0 maxpacket: 8 usb 4-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 usb 4-1: config 0 interface 0 altsetting 0 endpoint 0x81 has invalid wMaxPacketSize 0 usb 4-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor, different from the interface descriptor's value: 9 usb 4-1: New USB device found, idVendor=1e7d, idProduct=2d5a, bcdDevice= 0.00 usb 4-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 4-1: config 0 descriptor?? usbhid 4-1:0.0: can't add hid device: -71 usbhid: probe of 4-1:0.0 failed with error -71 usb 4-1: USB disconnect, device number 79 usb 4-1: new high-speed USB device number 80 using dummy_hcd usb 4-1: Using ep0 maxpacket: 8 usb 4-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 usb 4-1: config 0 interface 0 altsetting 0 endpoint 0x81 has invalid wMaxPacketSize 0 usb 4-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor, different from the interface descriptor's value: 9 usb 4-1: New USB device found, idVendor=1e7d, idProduct=2d5a, bcdDevice= 0.00 usb 4-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 4-1: config 0 descriptor?? usbhid 4-1:0.0: can't add hid device: -71 usbhid: probe of 4-1:0.0 failed with error -71 usb 4-1: USB disconnect, device number 80 usb 4-1: new high-speed USB device number 81 using dummy_hcd usb 4-1: device descriptor read/64, error 18 usb 4-1: device descriptor read/64, error 18 usb 4-1: new high-speed USB device number 82 using dummy_hcd usb 4-1: device descriptor read/64, error 18 usb 4-1: device descriptor read/64, error 18 usb usb4-port1: attempt power cycle usb 4-1: new high-speed USB device number 83 using dummy_hcd usb 4-1: Using ep0 maxpacket: 16 usb 4-1: config index 0 descriptor too short (expected 58986, got 36) usb 4-1: config 161 has too many interfaces: 201, using maximum allowed: 32 usb 4-1: config 161 has an invalid descriptor of length 0, skipping remainder of the config usb 4-1: config 161 has 1 interface, different from the descriptor's value: 201 usb 4-1: config 161 has no interface number 0 usb 4-1: too many endpoints for config 161 interface 8 altsetting 62: 58, using maximum allowed: 30 usb 4-1: config 161 interface 8 altsetting 62 has 0 endpoint descriptors, different from the interface descriptor's value: 58 usb 4-1: config 161 interface 8 has no altsetting 0 usb 4-1: New USB device found, idVendor=66ba, idProduct=92dc, bcdDevice= 5.ea usb 4-1: New USB device strings: Mfr=0, Product=0, SerialNumber=238 usb 4-1: SerialNumber: syz usb 4-1: USB disconnect, device number 83 usb 5-1: new high-speed USB device number 80 using dummy_hcd usb 5-1: New USB device found, idVendor=05d8, idProduct=810a, bcdDevice=d5.bd usb 5-1: New USB device strings: Mfr=2, Product=0, SerialNumber=0 usb 5-1: Manufacturer: syz usb 5-1: config 0 descriptor?? dvb-usb: found a 'Artec T1 USB2.0' in warm state. dvb-usb: bulk message failed: -22 (3/0) dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer. dvbdev: DVB: registering new adapter (Artec T1 USB2.0) usb 5-1: media controller created dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered. dvb-usb: bulk message failed: -22 (6/0) dvb-usb: no frontend was attached by 'Artec T1 USB2.0' input: IR-receiver inside an USB DVB receiver as /devices/platform/dummy_hcd.4/usb5/5-1/input/input41