linux-kernel - usb: warning in vhci_hcd_probe/lockdep_init

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Date:   Fri, 2 Dec 2016 15:35:44 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Valentina Manea <valentina.manea.m@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>
Subject: usb: warning in vhci_hcd_probe/lockdep_init_map

Hi!

I've got the following error report while booting the kernel with
various usb configs enabled.

On commit 2caceb3294a78c389b462e7e236a4e744a53a474 (Dec 1).

gadgetfs: USB Gadget filesystem, version 24 Aug 2004
usbip_core: USB/IP Core v1.0.0
vhci_hcd vhci_hcd: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd: new USB bus registered, assigned bus number 2
BUG: key ffff88006a7e8d18 not in .data!
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:3131
lockdep_init_map+0x60c/0x770
DEBUG_LOCKS_WARN_ON(1)[    1.567044] Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.9.0-rc7+ #58
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
 ffff88006bce6eb8 ffffffff81f96c8a ffffffff00000a02 1ffff1000d79cd6a
 ffffed000d79cd62 000000046bce6ed8 0000000041b58ab3 ffffffff8598af40
 ffffffff81f969f8 0000000000000000 0000000041b58ab3 0000000000000200
Call Trace:
 [<     inline     >] __dump_stack lib/dump_stack.c:15
 [<ffffffff81f96c8a>] dump_stack+0x292/0x398 lib/dump_stack.c:51
 [<ffffffff812b808f>] __warn+0x19f/0x1e0 kernel/panic.c:550
 [<ffffffff812b8195>] warn_slowpath_fmt+0xc5/0x110 kernel/panic.c:565
 [<ffffffff813f3efc>] lockdep_init_map+0x60c/0x770 kernel/locking/lockdep.c:3131
 [<ffffffff819e43d4>] __kernfs_create_file+0x114/0x2a0 fs/kernfs/file.c:954
 [<ffffffff819e68f5>] sysfs_add_file_mode_ns+0x225/0x520 fs/sysfs/file.c:305
 [<     inline     >] create_files fs/sysfs/group.c:64
 [<ffffffff819e8a89>] internal_create_group+0x239/0x8f0 fs/sysfs/group.c:134
 [<ffffffff819e915f>] sysfs_create_group+0x1f/0x30 fs/sysfs/group.c:156
 [<ffffffff8323de24>] vhci_start+0x5b4/0x7a0 drivers/usb/usbip/vhci_hcd.c:978
 [<ffffffff82c907ca>] usb_add_hcd+0x8da/0x1c60 drivers/usb/core/hcd.c:2867
 [<ffffffff8323bc57>] vhci_hcd_probe+0x97/0x130
drivers/usb/usbip/vhci_hcd.c:1103
 [<ffffffff827484ca>] platform_drv_probe+0x8a/0x180 drivers/base/platform.c:568
 [<     inline     >] really_probe drivers/base/dd.c:375
 [<ffffffff82741db4>] driver_probe_device+0x514/0x980 drivers/base/dd.c:515
 [<ffffffff8274260b>] __device_attach_driver+0x22b/0x290 drivers/base/dd.c:610
 [<ffffffff8273b3bc>] bus_for_each_drv+0x15c/0x200 drivers/base/bus.c:463
 [<ffffffff827415c6>] __device_attach+0x266/0x3c0 drivers/base/dd.c:667
 [<ffffffff8274270a>] device_initial_probe+0x1a/0x20 drivers/base/dd.c:714
 [<ffffffff8273ec06>] bus_probe_device+0x1e6/0x290 drivers/base/bus.c:557
 [<ffffffff82738266>] device_add+0xd06/0x1660 drivers/base/core.c:1136
 [<ffffffff82747f55>] platform_device_add+0x315/0x660
drivers/base/platform.c:408
 [<ffffffff82749ba6>] platform_device_register_full+0x396/0x4b0
drivers/base/platform.c:540
 [<     inline     >] platform_device_register_resndata
./include/linux/platform_device.h:111
 [<     inline     >] platform_device_register_simple
./include/linux/platform_device.h:140
 [<     inline     >] add_platform_device drivers/usb/usbip/vhci_hcd.c:1213
 [<ffffffff864e87aa>] vhci_hcd_init+0x215/0x305
drivers/usb/usbip/vhci_hcd.c:1254
 [<ffffffff81000696>] do_one_initcall+0xf6/0x360 init/main.c:778
 [<     inline     >] do_initcall_level init/main.c:844
 [<     inline     >] do_initcalls init/main.c:852
 [<     inline     >] do_basic_setup init/main.c:870
 [<ffffffff86424f84>] kernel_init_freeable+0x5c7/0x6a1 init/main.c:1017
 [<ffffffff84f2b7d3>] kernel_init+0x13/0x180 init/main.c:943
 [<ffffffff84f44f2a>] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:433
---[ end trace c33c7b202cf3aac8 ]---