asix 1-1:0.188 (unnamed net_device) (uninitialized): Failed to enable software MII access asix 1-1:0.188 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -71 asix 1-1:0.188 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71 asix 1-1:0.188 (unnamed net_device) (uninitialized): Failed to enable software MII access asix 1-1:0.188 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -71 ============================= WARNING: suspicious RCU usage syzkaller #0 Not tainted ----------------------------- drivers/net/phy/phy_device.c:1944 suspicious rcu_dereference_protected() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 locks held by kworker/1:2/991: 5, last CPU#1: #0: ffff8880222b2140 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #0: ffff8880222b2140 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffff8880222b2140 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline] #0: ffff8880222b2140 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479 #1: ffffc90004c8fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #1: ffffc90004c8fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #1: ffffc90004c8fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline] #1: ffffc90004c8fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479 #2: ffff888029ef21d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline] #2: ffff888029ef21d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4d30 drivers/usb/core/hub.c:5912 #3: ffff888079fed1d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline] #3: ffff888079fed1d8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450 drivers/base/dd.c:1073 #4: ffff888021ba21a0 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline] #4: ffff888021ba21a0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450 drivers/base/dd.c:1073 stack backtrace: CPU: 1 UID: 0 PID: 991 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Workqueue: usb_hub_wq hub_event Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6972 phy_detach+0x219/0x550 drivers/net/phy/phy_device.c:1944 phylink_connect_phy+0x1dc/0x300 drivers/net/phy/phylink.c:2267 ax88772_init_phy+0xe3/0x390 drivers/net/usb/asix_devices.c:714 ax88772_bind+0x9cb/0xe50 drivers/net/usb/asix_devices.c:925 usbnet_probe+0xab3/0x2ad0 drivers/net/usb/usbnet.c:1808 usb_probe_interface+0x788/0xe50 drivers/usb/core/driver.c:399 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:706 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620 device_add+0x7d7/0xb80 drivers/base/core.c:3776 usb_set_configuration+0x1ad8/0x2180 drivers/usb/core/message.c:2268 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 usb_probe_device+0x1c3/0x3b0 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:706 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620 device_add+0x7d7/0xb80 drivers/base/core.c:3776 usb_new_device+0x9aa/0x1690 drivers/usb/core/hub.c:2708 hub_port_connect drivers/usb/core/hub.c:5580 [inline] hub_port_connect_change drivers/usb/core/hub.c:5720 [inline] port_event drivers/usb/core/hub.c:5884 [inline] hub_event+0x28e8/0x4d30 drivers/usb/core/hub.c:5966 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 asix 1-1:0.188 (unnamed net_device) (uninitialized): Could not connect PHY asix 1-1:0.188: probe with driver asix failed with error -22 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: 32 usb 1-1: New USB device found, idVendor=17ef, idProduct=7203, bcdDevice=2e.36 usb 1-1: config 0 has an invalid interface number: 188 but max is 0 usb 1-1: config 0 has no interface number 0 usb 1-1: config 0 interface 188 altsetting 0 bulk endpoint 0x82 has invalid maxpacket 32 usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-1: Product: syz usb 1-1: Manufacturer: syz usb 1-1: SerialNumber: syz usb 1-1: config 0 descriptor?? asix 1-1:0.188 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -32 asix 1-1:0.188 (unnamed net_device) (uninitialized): Error reading RX_CTL register: ffffffe0 asix 1-1:0.188 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -32 asix 1-1:0.188 (unnamed net_device) (uninitialized): Error reading Medium Status register: ffffffe0 asix 1-1:0.188 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71 asix 1-1:0.188 (unnamed net_device) (uninitialized): Failed to enable hardware MII access asix 1-1:0.188 (unnamed net_device) (uninitialized): Could not register MDIO bus (err -5) asix 1-1:0.188: probe with driver asix failed with error -5 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: 32 usb 1-1: New USB device found, idVendor=17ef, idProduct=7203, bcdDevice=2e.36 usb 1-1: config 0 has an invalid interface number: 188 but max is 0 usb 1-1: config 0 has no interface number 0 usb 1-1: config 0 interface 188 altsetting 0 bulk endpoint 0x82 has invalid maxpacket 32 usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-1: Product: syz usb 1-1: Manufacturer: syz usb 1-1: SerialNumber: syz usb 1-1: config 0 descriptor?? asix 1-1:0.188 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -32 asix 1-1:0.188 (unnamed net_device) (uninitialized): Error reading RX_CTL register: ffffffe0 asix 1-1:0.188 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -32 asix 1-1:0.188 (unnamed net_device) (uninitialized): Error reading Medium Status register: ffffffe0 asix 1-1:0.188 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -32 asix 1-1:0.188 (unnamed net_device) (uninitialized): Failed to read reg index 0x0002: -32 asix 1-1:0.188 (unnamed net_device) (uninitialized): Could not register MDIO bus (err -5) asix 1-1:0.188: probe with driver asix failed with error -5