usb 1-1: 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 5.7.0-rc1-syzkaller #0 Not tainted -------------------------------------------- kworker/1:0/17 is trying to acquire lock: ffff8881cd594230 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_lock_bus include/linux/i2c.h:765 [inline] ffff8881cd594230 (i2c_register_adapter){+.+.}-{0:0}, at: __i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline] ffff8881cd594230 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_transfer+0x1d3/0x3e0 drivers/i2c/i2c-core-base.c:2002 but task is already holding lock: ffff8881cc86e5c8 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_lock_bus include/linux/i2c.h:765 [inline] ffff8881cc86e5c8 (i2c_register_adapter){+.+.}-{0:0}, at: __i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline] ffff8881cc86e5c8 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_transfer+0x1d3/0x3e0 drivers/i2c/i2c-core-base.c:2002 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/1:0/17: #0: ffff8881d8919d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8881d8919d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8881d8919d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8881d8919d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8881d8919d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8881d8919d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8881d8919d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x844/0x1630 kernel/workqueue.c:2239 #1: ffff8881da25fdc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x878/0x1630 kernel/workqueue.c:2243 #2: ffff8881d4e40218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline] #2: ffff8881d4e40218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1be/0x43c0 drivers/usb/core/hub.c:5509 #3: ffff8881c97e0218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline] #3: ffff8881c97e0218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7b/0x390 drivers/base/dd.c:851 #4: ffff8881c97e11a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline] #4: ffff8881c97e11a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7b/0x390 drivers/base/dd.c:851 #5: ffff8881ccf20198 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline] #5: ffff8881ccf20198 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7b/0x390 drivers/base/dd.c:851 #6: ffff8881cc86e5c8 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_lock_bus include/linux/i2c.h:765 [inline] #6: ffff8881cc86e5c8 (i2c_register_adapter){+.+.}-{0:0}, at: __i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline] #6: ffff8881cc86e5c8 (i2c_register_adapter){+.+.}-{0:0}, at: i2c_transfer+0x1d3/0x3e0 drivers/i2c/i2c-core-base.c:2002 stack backtrace: CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.7.0-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+0xef/0x16e lib/dump_stack.c:118 print_deadlock_bug kernel/locking/lockdep.c:2410 [inline] check_deadlock kernel/locking/lockdep.c:2451 [inline] validate_chain kernel/locking/lockdep.c:3221 [inline] __lock_acquire.cold+0x12e/0x3ef kernel/locking/lockdep.c:4355 lock_acquire+0x18b/0x7c0 kernel/locking/lockdep.c:4934 __rt_mutex_lock kernel/locking/rtmutex.c:1471 [inline] rt_mutex_lock_nested+0x41/0x60 kernel/locking/rtmutex.c:1484 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:2002 tc90522_master_xfer.part.0+0x65c/0xbf0 drivers/media/dvb-frontends/tc90522.c:708 tc90522_master_xfer+0x35/0x4e drivers/media/dvb-frontends/tc90522.c:643 __i2c_transfer drivers/i2c/i2c-core-base.c:1945 [inline] __i2c_transfer+0x49d/0x17a0 drivers/i2c/i2c-core-base.c:1910 i2c_transfer+0x1e6/0x3e0 drivers/i2c/i2c-core-base.c:2006 dvb_pll_attach+0x228/0x850 drivers/media/dvb-frontends/dvb-pll.c:816 dvb_pll_probe+0xfe/0x174 drivers/media/dvb-frontends/dvb-pll.c:884 i2c_device_probe+0x51a/0x800 drivers/i2c/i2c-core-base.c:396 really_probe+0x290/0xac0 drivers/base/dd.c:527 driver_probe_device+0x223/0x350 drivers/base/dd.c:701 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:808 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x390 drivers/base/dd.c:874 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0x1367/0x1c20 drivers/base/core.c:2533 i2c_new_client_device+0x589/0xa70 drivers/i2c/i2c-core-base.c:784 dvb_module_probe+0xf9/0x240 drivers/media/dvb-core/dvbdev.c:986 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+0x2de1/0x2f0e drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:981 usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:374 really_probe+0x290/0xac0 drivers/base/dd.c:527 driver_probe_device+0x223/0x350 drivers/base/dd.c:701 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:808 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x390 drivers/base/dd.c:874 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0x1367/0x1c20 drivers/base/core.c:2533 usb_set_configuration+0xed4/0x1850 drivers/usb/core/message.c:2025 usb_generic_driver_probe+0x9d/0xe0 drivers/usb/core/generic.c:241 usb_probe_device+0xd9/0x230 drivers/usb/core/driver.c:272 really_probe+0x290/0xac0 drivers/base/dd.c:527 driver_probe_device+0x223/0x350 drivers/base/dd.c:701 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:808 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x390 drivers/base/dd.c:874 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0x1367/0x1c20 drivers/base/core.c:2533 usb_new_device.cold+0x552/0xf6e drivers/usb/core/hub.c:2548 hub_port_connect drivers/usb/core/hub.c:5195 [inline] hub_port_connect_change drivers/usb/core/hub.c:5335 [inline] port_event drivers/usb/core/hub.c:5481 [inline] hub_event+0x226d/0x43c0 drivers/usb/core/hub.c:5563 process_one_work+0x965/0x1630 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x326/0x430 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 dvb_pll: probe of 1-0060 failed with error -12 usbhid 1-1:0.0: couldn't find an input interrupt endpoint usb 1-1: USB disconnect, device number 2 usb 1-1: new high-speed USB device number 3 using dummy_hcd usb 1-1: Using ep0 maxpacket: 16 usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=92.73 usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-1: config 0 descriptor?? usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' 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 (774 Friio White ISDB-T USB2.0) usb 1-1: media controller created dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered. tc90522 0-0018: Toshiba TC90522 attached. usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)... dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered. dvb_pll: probe of 1-0060 failed with error -12 usbhid 1-1:0.0: couldn't find an input interrupt endpoint usb 1-1: USB disconnect, device number 3 usb 1-1: new high-speed USB device number 4 using dummy_hcd usb 1-1: Using ep0 maxpacket: 16 usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=92.73 usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-1: config 0 descriptor?? usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' 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 (774 Friio White ISDB-T USB2.0) usb 1-1: media controller created dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered. tc90522 0-0018: Toshiba TC90522 attached. usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)... dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered. dvb_pll: probe of 1-0060 failed with error -12 usbhid 1-1:0.0: couldn't find an input interrupt endpoint usb 1-1: USB disconnect, device number 4 usb 1-1: new high-speed USB device number 5 using dummy_hcd usb 1-1: Using ep0 maxpacket: 16 usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=92.73 usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-1: config 0 descriptor?? usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' 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 (774 Friio White ISDB-T USB2.0) usb 1-1: media controller created dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered. tc90522 0-0018: Toshiba TC90522 attached. usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)... dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered. dvb_pll: probe of 1-0060 failed with error -12 usbhid 1-1:0.0: couldn't find an input interrupt endpoint usb 1-1: USB disconnect, device number 5 usb 1-1: new high-speed USB device number 6 using dummy_hcd usb 1-1: Using ep0 maxpacket: 16 usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=92.73 usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-1: config 0 descriptor?? usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' 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 (774 Friio White ISDB-T USB2.0) usb 1-1: media controller created dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered. tc90522 0-0018: Toshiba TC90522 attached. usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)... dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered. dvb_pll: probe of 1-0060 failed with error -12 usbhid 1-1:0.0: couldn't find an input interrupt endpoint usb 1-1: USB disconnect, device number 6 usb 1-1: new high-speed USB device number 7 using dummy_hcd usb 1-1: Using ep0 maxpacket: 16 usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=92.73 usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-1: config 0 descriptor?? usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' 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 (774 Friio White ISDB-T USB2.0) usb 1-1: media controller created dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered. tc90522 0-0018: Toshiba TC90522 attached. usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)... dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered. dvb_pll: probe of 1-0060 failed with error -12 usbhid 1-1:0.0: couldn't find an input interrupt endpoint usb 1-1: USB disconnect, device number 7 usb 1-1: new high-speed USB device number 8 using dummy_hcd usb 1-1: Using ep0 maxpacket: 16 usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=92.73 usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-1: config 0 descriptor?? usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' 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 (774 Friio White ISDB-T USB2.0) usb 1-1: media controller created dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered. tc90522 0-0018: Toshiba TC90522 attached. usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)... dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered. dvb_pll: probe of 1-0060 failed with error -12 usbhid 1-1:0.0: couldn't find an input interrupt endpoint usb 1-1: USB disconnect, device number 8 usb 1-1: new high-speed USB device number 9 using dummy_hcd usb 1-1: Using ep0 maxpacket: 16 usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=92.73 usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-1: config 0 descriptor?? usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' 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 (774 Friio White ISDB-T USB2.0) usb 1-1: media controller created dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered. tc90522 0-0018: Toshiba TC90522 attached. usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)... dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered. dvb_pll: probe of 1-0060 failed with error -12 usbhid 1-1:0.0: couldn't find an input interrupt endpoint usb 1-1: USB disconnect, device number 9 usb 1-1: new high-speed USB device number 10 using dummy_hcd usb 1-1: Using ep0 maxpacket: 16 usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=92.73 usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-1: config 0 descriptor?? usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' 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 (774 Friio White ISDB-T USB2.0) usb 1-1: media controller created dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered. tc90522 0-0018: Toshiba TC90522 attached. usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)... dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered. dvb_pll: probe of 1-0060 failed with error -12 usbhid 1-1:0.0: couldn't find an input interrupt endpoint usb 1-1: USB disconnect, device number 10 usb 1-1: new high-speed USB device number 11 using dummy_hcd usb 1-1: Using ep0 maxpacket: 16 usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=92.73 usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-1: config 0 descriptor?? usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' 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 (774 Friio White ISDB-T USB2.0) usb 1-1: media controller created dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered. tc90522 0-0018: Toshiba TC90522 attached. usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)... dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered. dvb_pll: probe of 1-0060 failed with error -12 usbhid 1-1:0.0: couldn't find an input interrupt endpoint usb 1-1: USB disconnect, device number 11