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SubjectKMSAN: uninit-value in sr9800_bind
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Hello,

syzbot found the following crash on:

HEAD commit: 124037e0 kmsan: drop inlines, rename do_kmsan_task_create()
git tree: https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=10f7e0cd600000
kernel config: https://syzkaller.appspot.com/x/.config?x=f03c659d0830ab8d
dashboard link: https://syzkaller.appspot.com/bug?extid=f1842130bbcfb335bac1
compiler: clang version 9.0.0 (/home/glider/llvm/clang
80fee25776c2fb61e74c1ecb1a523375c2500b69)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=142acef3600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11811bbd600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+f1842130bbcfb335bac1@syzkaller.appspotmail.com

CoreChips 2-1:0.159 (unnamed net_device) (uninitialized): Error reading
RX_CTL register:ffffffb9
CoreChips 2-1:0.159 (unnamed net_device) (uninitialized): Failed to enable
software MII access
CoreChips 2-1:0.159 (unnamed net_device) (uninitialized): Failed to enable
hardware MII access
=====================================================
BUG: KMSAN: uninit-value in usbnet_probe+0x10ae/0x3960
drivers/net/usb/usbnet.c:1722
CPU: 1 PID: 11159 Comm: kworker/1:4 Not tainted 5.3.0-rc7+ #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+0x191/0x1f0 lib/dump_stack.c:113
kmsan_report+0x13a/0x2b0 mm/kmsan/kmsan_report.c:108
__msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250
sr_get_phyid drivers/net/usb/sr9800.c:380 [inline]
sr9800_bind+0xd39/0x1b10 drivers/net/usb/sr9800.c:800
usbnet_probe+0x10ae/0x3960 drivers/net/usb/usbnet.c:1722
usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361
really_probe+0x1373/0x1dc0 drivers/base/dd.c:552
driver_probe_device+0x1ba/0x510 drivers/base/dd.c:709
__device_attach_driver+0x5b8/0x790 drivers/base/dd.c:816
bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
__device_attach+0x489/0x750 drivers/base/dd.c:882
device_initial_probe+0x4a/0x60 drivers/base/dd.c:929
bus_probe_device+0x131/0x390 drivers/base/bus.c:514
device_add+0x25b5/0x2df0 drivers/base/core.c:2165
usb_set_configuration+0x309f/0x3710 drivers/usb/core/message.c:2027
generic_probe+0xe7/0x280 drivers/usb/core/generic.c:210
usb_probe_device+0x146/0x200 drivers/usb/core/driver.c:266
really_probe+0x1373/0x1dc0 drivers/base/dd.c:552
driver_probe_device+0x1ba/0x510 drivers/base/dd.c:709
__device_attach_driver+0x5b8/0x790 drivers/base/dd.c:816
bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
__device_attach+0x489/0x750 drivers/base/dd.c:882
device_initial_probe+0x4a/0x60 drivers/base/dd.c:929
bus_probe_device+0x131/0x390 drivers/base/bus.c:514
device_add+0x25b5/0x2df0 drivers/base/core.c:2165
usb_new_device+0x23e5/0x2fb0 drivers/usb/core/hub.c:2536
hub_port_connect drivers/usb/core/hub.c:5098 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
port_event drivers/usb/core/hub.c:5359 [inline]
hub_event+0x581d/0x72f0 drivers/usb/core/hub.c:5441
process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269
process_scheduled_works kernel/workqueue.c:2331 [inline]
worker_thread+0x189c/0x2460 kernel/workqueue.c:2417
kthread+0x4b5/0x4f0 kernel/kthread.c:256
ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355

Local variable description: ----res@sr_mdio_read
Variable was created at:
sr_mdio_read+0x78/0x360 drivers/net/usb/sr9800.c:341
sr_get_phyid drivers/net/usb/sr9800.c:379 [inline]
sr9800_bind+0xce9/0x1b10 drivers/net/usb/sr9800.c:800
=====================================================


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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