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Tue, 15 Oct 2019 14:22:07 -0700 (PDT) Date: Tue, 15 Oct 2019 14:22:07 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000009763320594f993ee@google.com> Subject: KMSAN: uninit-value in asix_mdio_write From: syzbot To: davem@davemloft.net, glider@google.com, gregkh@linuxfoundation.org, hslester96@gmail.com, kstewart@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: c2453450 kmsan: kcov: prettify the code unpoisoning area->.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=1159ab53600000 kernel config: https://syzkaller.appspot.com/x/.config?x=3684f3c73f43899a dashboard link: https://syzkaller.appspot.com/bug?extid=7dc7c28d4577bbe55b10 compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17e7276f600000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15609b30e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+7dc7c28d4577bbe55b10@syzkaller.appspotmail.com asix 1-1:0.145 (unnamed net_device) (uninitialized): Failed to enable software MII access asix 1-1:0.145 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -71 ===================================================== BUG: KMSAN: uninit-value in asix_mdio_write+0x3fa/0x8d0 drivers/net/usb/asix_common.c:496 CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.4.0-rc3+ #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+0x14a/0x2f0 mm/kmsan/kmsan_report.c:109 __msan_warning+0x73/0xf0 mm/kmsan/kmsan_instr.c:245 asix_mdio_write+0x3fa/0x8d0 drivers/net/usb/asix_common.c:496 asix_phy_reset+0xd8/0x2d0 drivers/net/usb/asix_devices.c:208 ax88172_bind+0x780/0xbd0 drivers/net/usb/asix_devices.c:272 usbnet_probe+0x10d3/0x39d0 drivers/net/usb/usbnet.c:1730 usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361 really_probe+0xd91/0x1f90 drivers/base/dd.c:552 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430 __device_attach+0x489/0x750 drivers/base/dd.c:894 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941 bus_probe_device+0x131/0x390 drivers/base/bus.c:490 device_add+0x25b5/0x2df0 drivers/base/core.c:2201 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+0xd91/0x1f90 drivers/base/dd.c:552 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430 __device_attach+0x489/0x750 drivers/base/dd.c:894 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941 bus_probe_device+0x131/0x390 drivers/base/bus.c:490 device_add+0x25b5/0x2df0 drivers/base/core.c:2201 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@asix_mdio_write Variable was created at: asix_mdio_write+0xc7/0x8d0 drivers/net/usb/asix_common.c:480 asix_mdio_write+0xc7/0x8d0 drivers/net/usb/asix_common.c:480 ===================================================== --- 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