asix 4-1:0.0 (unnamed net_device) (uninitialized): Error reading Medium Status register: ffffffb9
asix 4-1:0.0 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71
asix 4-1:0.0 (unnamed net_device) (uninitialized): Failed to enable software MII access
asix 4-1:0.0 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -71
=====================================================
BUG: KMSAN: uninit-value in asix_mdio_read+0x4ce/0xa20 drivers/net/usb/asix_common.c:460
CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 5.13.0-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+0x24c/0x2e0 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x5c/0xa0 mm/kmsan/kmsan_instr.c:197
 asix_mdio_read+0x4ce/0xa20 drivers/net/usb/asix_common.c:460
 asix_get_phyid drivers/net/usb/asix_devices.c:78 [inline]
 ax88772_bind+0xae4/0x13e0 drivers/net/usb/asix_devices.c:739
 usbnet_probe+0x1163/0x3e30 drivers/net/usb/usbnet.c:1728
 usb_probe_interface+0xfcc/0x1520 drivers/usb/core/driver.c:396
 really_probe+0xc71/0x25a0 drivers/base/dd.c:580
 driver_probe_device+0x31b/0x420 drivers/base/dd.c:763
 __device_attach_driver+0x6d8/0x8d0 drivers/base/dd.c:870
 bus_for_each_drv+0x2c8/0x3f0 drivers/base/bus.c:431
 __device_attach+0x57f/0x8a0 drivers/base/dd.c:938
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:985
 bus_probe_device+0x17e/0x3d0 drivers/base/bus.c:491
 device_add+0x2bba/0x35c0 drivers/base/core.c:3324
 usb_set_configuration+0x3872/0x3eb0 drivers/usb/core/message.c:2164
 usb_generic_driver_probe+0x138/0x300 drivers/usb/core/generic.c:238
 usb_probe_device+0x317/0x570 drivers/usb/core/driver.c:293
 really_probe+0xc71/0x25a0 drivers/base/dd.c:580
 driver_probe_device+0x31b/0x420 drivers/base/dd.c:763
 __device_attach_driver+0x6d8/0x8d0 drivers/base/dd.c:870
 bus_for_each_drv+0x2c8/0x3f0 drivers/base/bus.c:431
 __device_attach+0x57f/0x8a0 drivers/base/dd.c:938
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:985
 bus_probe_device+0x17e/0x3d0 drivers/base/bus.c:491
 device_add+0x2bba/0x35c0 drivers/base/core.c:3324
 usb_new_device+0x1bd4/0x2a30 drivers/usb/core/hub.c:2558
 hub_port_connect drivers/usb/core/hub.c:5278 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5418 [inline]
 port_event drivers/usb/core/hub.c:5564 [inline]
 hub_event+0x5a11/0x87a0 drivers/usb/core/hub.c:5646
 process_one_work+0x1219/0x1fe0 kernel/workqueue.c:2276
 worker_thread+0x10ec/0x2340 kernel/workqueue.c:2422
 kthread+0x521/0x560 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Local variable ----smsr@asix_mdio_read created at:
 asix_mdio_read+0x95/0xa20 drivers/net/usb/asix_common.c:448
 asix_mdio_read+0x95/0xa20 drivers/net/usb/asix_common.c:448
=====================================================