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Date: Mon, 07 Oct 2019 12:19:06 -0700 From: syzbot <syzbot+a631ec9e717fb0423053@...kaller.appspotmail.com> To: allison@...utok.net, davem@...emloft.net, glider@...gle.com, gregkh@...uxfoundation.org, kstewart@...uxfoundation.org, linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, netdev@...r.kernel.org, opensource@...ayne.com, swinslow@...il.com, syzkaller-bugs@...glegroups.com, tglx@...utronix.de Subject: KMSAN: uninit-value in asix_mdio_read Hello, syzbot found the following crash on: HEAD commit: 1e76a3e5 kmsan: replace __GFP_NO_KMSAN_SHADOW with kmsan_i.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=10327cc3600000 kernel config: https://syzkaller.appspot.com/x/.config?x=f03c659d0830ab8d dashboard link: https://syzkaller.appspot.com/bug?extid=a631ec9e717fb0423053 compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12e9a3db600000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=167fcefb600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+a631ec9e717fb0423053@...kaller.appspotmail.com asix 1-1:0.78 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71 asix 1-1:0.78 (unnamed net_device) (uninitialized): Failed to send software reset: ffffffb9 asix 1-1:0.78 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71 asix 1-1:0.78 (unnamed net_device) (uninitialized): Failed to enable software MII access asix 1-1:0.78 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -71 ===================================================== BUG: KMSAN: uninit-value in asix_mdio_bus_read+0xbc/0xe0 drivers/net/usb/ax88172a.c:31 CPU: 0 PID: 2919 Comm: kworker/0:2 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 asix_mdio_read+0x3e9/0x8f0 drivers/net/usb/asix_common.c:461 asix_mdio_bus_read+0xbc/0xe0 drivers/net/usb/ax88172a.c:31 __mdiobus_read+0x106/0x3d0 drivers/net/phy/mdio_bus.c:563 mdiobus_read+0xbd/0x110 drivers/net/phy/mdio_bus.c:640 get_phy_id drivers/net/phy/phy_device.c:785 [inline] get_phy_device+0x331/0x8a0 drivers/net/phy/phy_device.c:819 mdiobus_scan+0x91/0x760 drivers/net/phy/mdio_bus.c:527 __mdiobus_register+0x86d/0xca0 drivers/net/phy/mdio_bus.c:426 ax88172a_init_mdio drivers/net/usb/ax88172a.c:105 [inline] ax88172a_bind+0xcc5/0xf80 drivers/net/usb/ax88172a.c:243 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 worker_thread+0x111b/0x2460 kernel/workqueue.c:2415 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 Local variable description: ----smsr@...x_mdio_read Variable was created at: asix_mdio_read+0xa0/0x8f0 include/linux/netdevice.h:2180 asix_mdio_bus_read+0xbc/0xe0 drivers/net/usb/ax88172a.c:31 ===================================================== --- 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@...glegroups.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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