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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1421057

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: trusty

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https://bugs.launchpad.net/bugs/1421057

Title:
  BUG: unable to handle kernel NULL pointer dereference at
  (null)

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 3.13.0-45.74-generic 3.13.11-ckt13

  [25164.310618] usb 7-2: USB disconnect, device number 2
  [25164.310819] BUG: unable to handle kernel NULL pointer dereference at           (null)
  [25164.310875] IP: [<ffffffffa02d0142>] snd_info_disconnect+0x22/0xd0 [snd]
  [25164.310925] PGD 0 
  [25164.310941] Oops: 0000 [#1] SMP 
  [25164.310966] Modules linked in: ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp bridge stp llc ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables ctr ccm dm_crypt nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache eeepc_wmi asus_wmi sparse_keymap intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel snd_hda_codec_hdmi kvm arc4 snd_hda_codec_realtek dm_multipath scsi_dh crct10dif_pclmul ath9k crc32_pclmul ath9k_common ath9k_hw snd_hda_intel snd_usb_audio snd_hda_codec ath ghash_clmulni_intel snd_usbmidi_lib aesni_intel mac80211 snd_hwdep snd_seq_midi aes_x86_64 snd_seq_midi_event lrw gf128mul glue_helper ablk_helper snd_rawmidi cryptd cfg80211 serio_raw snd_pcm snd_seq lpc_ich snd_page_alloc shpchp snd_seq_device snd_timer snd mei_me mei soundcore mac_hid nls_iso8859_1 lp parport ses enclosure raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid0 multipath linear raid1 usb_storage mxm_wmi i915 psmouse i2c_algo_bit e1000e firewire_ohci drm_kms_helper ahci firewire_core libahci drm ptp crc_itu_t pps_core video wmi
  [25164.311800] CPU: 1 PID: 71 Comm: khubd Not tainted 3.13.0-45-generic #74-Ubuntu
  [25164.311841] Hardware name: System manufacturer System Product Name/P8Z77-V PRO, BIOS 1708 11/09/2012
  [25164.311891] task: ffff8807f4b30000 ti: ffff8807f4b26000 task.ti: ffff8807f4b26000
  [25164.311932] RIP: 0010:[<ffffffffa02d0142>]  [<ffffffffa02d0142>] snd_info_disconnect+0x22/0xd0 [snd]
  [25164.311993] RSP: 0018:ffff8807f4b27ad8  EFLAGS: 00010207
  [25164.312023] RAX: 0000000000000000 RBX: 02ffff0000000000 RCX: 000000018020000a
  [25164.312062] RDX: ffffea001fc85d40 RSI: 000000008020000a RDI: ffffea001fc85c28
  [25164.312101] RBP: ffff8807f4b27af0 R08: 0000000000000000 R09: 0000000000000001
  [25164.312140] R10: ffffea001fcbe480 R11: ffffffff8122a08d R12: ffffea001fc85cb0
  [25164.312178] R13: ffffea001fc85c28 R14: ffff8807f031b240 R15: 0000000000000000
  [25164.312217] FS:  0000000000000000(0000) GS:ffff88081fa40000(0000) knlGS:0000000000000000
  [25164.312261] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [25164.312293] CR2: 0000000000000000 CR3: 0000000001c0e000 CR4: 00000000001407e0
  [25164.312332] Stack:
  [25164.312345]  02ffff0000000000 ffff8807f0250048 ffff8807f024ffc0 ffff8807f4b27b18
  [25164.312395]  ffffffffa02d0162 ffffea001fc85d40 ffff8807f025bbc8 ffff8807f025bb40
  [25164.312443]  ffff8807f4b27b40 ffffffffa02d0162 ffff8807f025b5d8 ffff8807ef138748
  [25164.312491] Call Trace:
  [25164.312519]  [<ffffffffa02d0162>] snd_info_disconnect+0x42/0xd0 [snd]
  [25164.312561]  [<ffffffffa02d0162>] snd_info_disconnect+0x42/0xd0 [snd]
  [25164.312602]  [<ffffffffa02d0162>] snd_info_disconnect+0x42/0xd0 [snd]
  [25164.312644]  [<ffffffffa02d11f6>] snd_info_card_disconnect+0x46/0x60 [snd]
  [25164.312688]  [<ffffffffa02ce86d>] snd_card_disconnect+0x13d/0x1e0 [snd]
  [25164.312731]  [<ffffffffa05254f8>] usb_audio_disconnect+0x98/0x1d0 [snd_usb_audio]
  [25164.312776]  [<ffffffff8154b3e4>] usb_unbind_interface+0x64/0x1c0
  [25164.312813]  [<ffffffff8149766f>] __device_release_driver+0x7f/0xf0
  [25164.312849]  [<ffffffff81497703>] device_release_driver+0x23/0x30
  [25164.312884]  [<ffffffff81496f88>] bus_remove_device+0x108/0x180
  [25164.312919]  [<ffffffff81493a39>] device_del+0x129/0x1c0
  [25164.312951]  [<ffffffff81548dc0>] usb_disable_device+0xb0/0x290
  [25164.312987]  [<ffffffff8153d80d>] usb_disconnect+0xad/0x200
  [25164.313020]  [<ffffffff81540395>] hub_port_connect_change+0xd5/0xb50
  [25164.313057]  [<ffffffff815477c4>] ? usb_control_msg+0xd4/0x110
  [25164.313094]  [<ffffffff815412e4>] hub_events+0x4d4/0xa30
  [25164.313126]  [<ffffffff81541875>] hub_thread+0x35/0x160
  [25164.313159]  [<ffffffff810ab0b0>] ? prepare_to_wait_event+0x100/0x100
  [25164.313196]  [<ffffffff81541840>] ? hub_events+0xa30/0xa30
  [25164.313228]  [<ffffffff8108b572>] kthread+0xd2/0xf0
  [25164.313257]  [<ffffffff8108b4a0>] ? kthread_create_on_node+0x1c0/0x1c0
  [25164.313295]  [<ffffffff817318bc>] ret_from_fork+0x7c/0xb0
  [25164.313326]  [<ffffffff8108b4a0>] ? kthread_create_on_node+0x1c0/0x1c0
  [25164.313362] Code: e9 67 ff ff ff 0f 1f 40 00 0f 1f 44 00 00 55 48 89 e5 41 55 49 89 fd 41 54 4c 8d a7 88 00 00 00 53 48 8b 87 88 00 00 00 4c 39 e0 <48> 8b 18 75 0f eb 21 0f 1f 80 00 00 00 00 48 89 d8 48 89 d3 48 
  [25164.313614] RIP  [<ffffffffa02d0142>] snd_info_disconnect+0x22/0xd0 [snd]
  [25164.313660]  RSP <ffff8807f4b27ad8>
  [25164.313680] CR2: 0000000000000000
  [25164.467559] ---[ end trace 55c6f127d180b7ea ]---

  System uptime 7h42m. (Reboot caused by power failure.)
  Bug triggered by powering on external USB sound card (Benchmark DAC2 in USB2.0 mode)
  lsusb -v is now hanging

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