Greetings,

I got the below dmesg and the first bad commit is

commit 6229dddfed2f129a6e002daaafd8c6b5d7f4f982
Author:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
AuthorDate: Sat Dec 7 11:44:16 2013 -0700
Commit:     Bjorn Helgaas <bhelgaas@google.com>
CommitDate: Sat Dec 7 11:44:16 2013 -0700

    PCI: Export MSI mode in sysfs using attributes, not kobjects
    
    The PCI MSI sysfs code is a mess with kobjects for things that don't
    really need to be kobjects.  This patch creates attributes dynamically
    for the MSI interrupts instead of using kobjects.
    
    [bhelgaas: This also fixes a problem reported by Veaceslav (see link
    below): calling pci_enable_msi() too soon after pci_disable_msi() can fail
    with "sysfs: cannot create duplicate filename '.../msi_irqs' because the
    msi_irqs kset was still active.  This can happen with various module
    unload/reload and bonding scenarios.]
    
    Note, this removes a directory from the current MSI interrupt sysfs
    code:
    
      old MSI kobjects:
        pci_device
           └── msi_irqs
               └── 40
                   └── mode
    
      new MSI attributes:
        pci_device
           └── msi_irqs
               └── 40
    
    As there was only one file "mode" with the kobject model, the interrupt
    number is now a file that returns the "mode" of the interrupt (msi vs.
    msix).
    
    [bhelgaas: Neil confirmed that this sysfs change doesn't affect irqbalance
    because it only cares about the *names* of the entries in msi_irqs/; it
    doesn't care whether those entries are files or directories.  It may break
    other programs that depend on sysfs layout.]
    
    Link: http://lkml.kernel.org/r/1379382464-7920-1-git-send-email-vfalico@redhat.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
    Reviewed-by: Veaceslav Falico <vfalico@redhat.com>
    Acked-by: Neil Horman <nhorman@tuxdriver.com>

+----------------------------------------------------------------+----+
|                                                                |    |
+----------------------------------------------------------------+----+
| boot_successes                                                 | 0  |
| boot_failures                                                  | 19 |
| BUG:key_not_in.data                                            | 17 |
| WARNING:CPU:PID:at_kernel/locking/lockdep.c:lockdep_init_map() | 17 |
| inconsistent_SOFTIRQ-ON-W-IN-SOFTIRQ-W_usage                   | 2  |
+----------------------------------------------------------------+----+

[    2.212293] virtio-pci 0000:00:04.0: irq 40 for MSI/MSI-X
[    2.213913] virtio-pci 0000:00:04.0: irq 41 for MSI/MSI-X
[    2.215595] BUG: key ffff8800192a6ad0 not in .data!
[    2.217058] ------------[ cut here ]------------
[    2.218474] WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:2987 lockdep_init_map+0x127/0x462()
[    2.221519] DEBUG_LOCKS_WARN_ON(1)
[    2.222162] Modules linked in:
[    2.224095] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.13.0-rc3-00182-g31e0787 #882
[    2.226345] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011                       
[    2.227632]  0000000000000002 ffff88001e6d5968 ffffffff81ae4fad ffff88001e6d59b0
[    2.229933]  ffff88001e6d59a0 ffffffff81071e22 ffffffff810ae405 ffff8800192a6ad0
[    2.232245]  ffff8800192dd8d0 0000000000000000 0000000000000000 ffff88001e6d5a00
[    2.234549] Call Trace:
[    2.235418]  [<ffffffff81ae4fad>] dump_stack+0x4d/0x66
[    2.236638]  [<ffffffff81071e22>] warn_slowpath_common+0x7f/0x98
[    2.237962]  [<ffffffff810ae405>] ? lockdep_init_map+0x127/0x462
[    2.239292]  [<ffffffff81071e87>] warn_slowpath_fmt+0x4c/0x4e   
[    2.240585]  [<ffffffff810ae405>] lockdep_init_map+0x127/0x462
[    2.241894]  [<ffffffff811d19a2>] ? sysfs_new_dirent+0x8f/0x111
[    2.243216]  [<ffffffff811d0d5a>] sysfs_add_file_mode_ns+0x66/0xb4
[    2.244570]  [<ffffffff811d2b97>] internal_create_group+0x153/0x1de
[    2.245942]  [<ffffffff811d2c35>] sysfs_create_group+0x13/0x15     
[    2.247259]  [<ffffffff811d2df9>] sysfs_create_groups+0x27/0x64
[    2.248577]  [<ffffffff814ac79e>] populate_msi_sysfs+0x165/0x17d
[    2.249906]  [<ffffffff814ad8bd>] pci_enable_msix+0x2de/0x36b   
[    2.251205]  [<ffffffff81519bd1>] vp_request_msix_vectors+0xc6/0x217
[    2.252585]  [<ffffffff81519dca>] vp_try_to_find_vqs+0xa8/0x41f
[    2.253913]  [<ffffffff815f83c0>] ? virtblk_probe+0x9a/0x572
[    2.255198]  [<ffffffff8151a290>] vp_find_vqs+0x35/0x8d     
[    2.256443]  [<ffffffff815f78d8>] init_vq+0x3f/0x61
[    2.257618]  [<ffffffff815f793d>] ? virtblk_restore+0x43/0x43
[    2.258913]  [<ffffffff815f844c>] virtblk_probe+0x126/0x572  
[    2.260183]  [<ffffffff81517acf>] virtio_dev_probe+0xbc/0xfa
[    2.261477]  [<ffffffff815db6b6>] driver_probe_device+0x9d/0x1b8
[    2.262804]  [<ffffffff815db86f>] __driver_attach+0x61/0x83
[    2.264078]  [<ffffffff815db80e>] ? __device_attach+0x3d/0x3d
[    2.265379]  [<ffffffff815d9cb6>] bus_for_each_dev+0x80/0x8a
[    2.266664]  [<ffffffff815db1fd>] driver_attach+0x1e/0x20
[    2.267914]  [<ffffffff815dae9c>] bus_add_driver+0x10e/0x1d8
[    2.269197]  [<ffffffff815dbe11>] driver_register+0x8e/0xca
[    2.270473]  [<ffffffff81517db2>] register_virtio_driver+0x2b/0x2d
[    2.271829]  [<ffffffff823f75c3>] init+0x53/0x85
[    2.272972]  [<ffffffff823f7570>] ? init_cryptoloop+0x2a/0x2a
[    2.274270]  [<ffffffff8100029a>] do_one_initcall+0x84/0x11a
[    2.275556]  [<ffffffff8108e91e>] ? parse_args+0x189/0x249
[    2.276820]  [<ffffffff823aaf5c>] kernel_init_freeable+0x1d9/0x25f
[    2.278162]  [<ffffffff823aa759>] ? do_early_param+0x88/0x88
[    2.279446]  [<ffffffff81ad17d9>] ? rest_init+0xcd/0xcd     
[    2.280668]  [<ffffffff81ad17e7>] kernel_init+0xe/0x104
[    2.281896]  [<ffffffff81af8b7c>] ret_from_fork+0x7c/0xb0
[    2.283147]  [<ffffffff81ad17d9>] ? rest_init+0xcd/0xcd
[    2.284374] ---[ end trace bd4d220a7a045ff3 ]---
[    2.285538] BUG: key ffff8800192a7278 not in .data!

git bisect start 31e078736811963afecfe7305a51541cbed8e6a6 374b105797c3d4f29c685f3be535c35f5689b30e --
git bisect  bad 77380abb5fc9d79b8158698e52a9abb3de00057c  # 11:58      0-      1  Merge 'pci/pci/misc' into devel-xian-x86_64-201312130852
git bisect good ef7aa32df0138c4022db9fdccb6a193f54389330  # 12:44     22+      1  Merge 'pci/pci/deletion' into devel-xian-x86_64-201312130852
git bisect good b2267e7c13a843935d3688f93bd197b82b871568  # 13:05     22+      0  Merge 'pci/pci/host-imx6' into devel-xian-x86_64-201312130852
git bisect  bad 13de796cf8665bed3dcbf7ac1dc03a17ba479633  # 13:27      0-      2  PCI/portdrv: Remove superfluous name cast
git bisect  bad 6229dddfed2f129a6e002daaafd8c6b5d7f4f982  # 13:29      0-      4  PCI: Export MSI mode in sysfs using attributes, not kobjects
git bisect good 045cc22e53a1a0caaa9a0b6b64246d2690049906  # 13:50     22+      0  PCI: Clear NumVFs when disabling SR-IOV in sriov_init()
# first bad commit: [6229dddfed2f129a6e002daaafd8c6b5d7f4f982] PCI: Export MSI mode in sysfs using attributes, not kobjects
git bisect good 045cc22e53a1a0caaa9a0b6b64246d2690049906  # 14:33     66+      0  PCI: Clear NumVFs when disabling SR-IOV in sriov_init()
git bisect  bad 31e078736811963afecfe7305a51541cbed8e6a6  # 14:33      0-     19  Merge 'net/master' into devel-xian-x86_64-201312130852
git bisect good b81f81f9d450c0e92bfd746df2364d110784c97c  # 14:54     66+     66  Revert "PCI: Export MSI mode in sysfs using attributes, not kobjects"
git bisect good 8d2763770c34e8ed771f0be86760eb4485febc05  # 15:19     66+      0  Merge branch 'akpm' (fixes from Andrew)
git bisect  bad 1a63d5777d237952bb06f1a2481c3acc366aeb8d  # 15:20      0-      9  Add linux-next specific files for 20131213

Thanks,
Fengguang