============================= WARNING: suspicious RCU usage 5.11.0-rc1-syzkaller #0 Not tainted ----------------------------- net/wireless/reg.c:144 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 5 locks held by kworker/1:2/1484: #0: ffff888103f6c538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888103f6c538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888103f6c538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888103f6c538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888103f6c538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888103f6c538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x871/0x1580 kernel/workqueue.c:2246 #1: ffffc90006d27da8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1580 kernel/workqueue.c:2250 #2: ffff8881092b6218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:725 [inline] #2: ffff8881092b6218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c5/0x42d0 drivers/usb/core/hub.c:5537 #3: ffff888140dd9218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:725 [inline] #3: ffff888140dd9218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:894 #4: ffff88810da141a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:725 [inline] #4: ffff88810da141a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:894 stack backtrace: CPU: 1 PID: 1484 Comm: kworker/1:2 Not tainted 5.11.0-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:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 get_wiphy_regdom net/wireless/reg.c:144 [inline] get_wiphy_regdom+0xc3/0xd0 net/wireless/reg.c:142 wiphy_apply_custom_regulatory+0x234/0x360 net/wireless/reg.c:2574 _rtl_regd_init_wiphy drivers/net/wireless/realtek/rtlwifi/regd.c:343 [inline] rtl_regd_init+0x36d/0x760 drivers/net/wireless/realtek/rtlwifi/regd.c:421 rtl_init_core+0x83e/0x1a30 drivers/net/wireless/realtek/rtlwifi/base.c:539 rtl_usb_probe.cold+0x76b/0xac1 drivers/net/wireless/realtek/rtlwifi/usb.c:1060 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396 really_probe+0x291/0xde0 drivers/base/dd.c:561 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:745 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:851 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:919 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbc4/0x1d90 drivers/base/core.c:3091 usb_set_configuration+0x113c/0x1910 drivers/usb/core/message.c:2164 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293 really_probe+0x291/0xde0 drivers/base/dd.c:561 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:745 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:851 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:919 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbc4/0x1d90 drivers/base/core.c:3091 usb_new_device.cold+0x71d/0xfe9 drivers/usb/core/hub.c:2555 hub_port_connect drivers/usb/core/hub.c:5223 [inline] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] port_event drivers/usb/core/hub.c:5509 [inline] hub_event+0x2348/0x42d0 drivers/usb/core/hub.c:5591 process_one_work+0x98d/0x1580 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x38c/0x460 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 rtl8192cu: Loading firmware rtlwifi/rtl8192cufw_TMSC.bin usb 5-1: USB disconnect, device number 100 usb 5-1: new high-speed USB device number 101 using dummy_hcd usb 5-1: Using ep0 maxpacket: 8 usb 5-1: config 1 interface 0 altsetting 0 endpoint 0x1 has invalid maxpacket 1792, setting to 1024 usb 5-1: config 1 interface 0 altsetting 0 bulk endpoint 0x1 has invalid maxpacket 1024 usb 5-1: config 1 interface 0 altsetting 0 bulk endpoint 0x82 has invalid maxpacket 65 usb 5-1: config 1 interface 0 altsetting 0 has 2 endpoint descriptors, different from the interface descriptor's value: 18 usb 5-1: New USB device found, idVendor=0525, idProduct=a4a8, bcdDevice= 0.07 usb 5-1: New USB device strings: Mfr=0, Product=250, SerialNumber=0 usb 5-1: Product: syz hub 5-1:1.0: bad descriptor, ignoring hub hub: probe of 5-1:1.0 failed with error -5 usblp 5-1:1.0: usblp0: USB Bidirectional printer dev 101 if 0 alt 0 proto 3 vid 0x0525 pid 0xA4A8 usb 5-1: USB disconnect, device number 101 usblp0: removed usb 6-1: USB disconnect, device number 53 usb 6-1: ath9k_htc: USB layer deinitialized usb 6-1: new high-speed USB device number 54 using dummy_hcd usb 6-1: Using ep0 maxpacket: 16 usb 6-1: unable to get BOS descriptor or descriptor too short usb 6-1: config 1 has an invalid descriptor of length 0, skipping remainder of the config usb 6-1: config 1 has 1 interface, different from the descriptor's value: 3 usb 6-1: config 1 interface 0 altsetting 0 has 1 endpoint descriptor, different from the interface descriptor's value: 0 usb 6-1: Duplicate descriptor for config 1 interface 0 altsetting 0, skipping usb 6-1: New USB device found, idVendor=1d6b, idProduct=0101, bcdDevice= 0.40 usb 6-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 6-1: Product: syz usb 6-1: Manufacturer: syz usb 6-1: SerialNumber: syz usb 6-1: 0:2 : does not exist usb 6-1: USB disconnect, device number 54 usb 5-1: USB disconnect, device number 105 usb 5-1: new high-speed USB device number 106 using dummy_hcd usb 5-1: Using ep0 maxpacket: 8 usb 5-1: New USB device found, idVendor=eb2a, idProduct=17de, bcdDevice=b7.d4 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: config 0 descriptor?? usb 5-1: can't set config #0, error -71 usb 5-1: USB disconnect, device number 106