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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Alan Pope ㋛, this bug report is being closed due to your last comment
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/966151/comments/11
regarding you no longer have the hardware immediately accessible. You
are welcome to reopen this report if it becomes immediately accessible.
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** Changed in: linux (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/966151

Title:
  Kernel oops when unplugging USB devices

Status in The Linux Kernel:
  Incomplete
Status in “linux” package in Ubuntu:
  Invalid

Bug description:
  I have a keyboard and USB wifi dongle attached to a USB hub which is attached via a cable to my PC.
  I noticed the keyboard stopped responding so reached for the USB hub and unplugged it.
  Instantly got a kernel oops screen.

   [ 9881.300460] usb 1-1.1.4: USB disconnect, device number 6
  [ 9881.300462] usb 1-1.1.4.3: USB disconnect, device number 7
  [ 9881.302713] usb 1-1.1.4: clear tt 1 (0070) error -71
  [ 9881.558614] usb 1-1.1.4.4: USB disconnect, device number 8
  [ 9881.797709] BUG: unable to handle kernel NULL pointer dereference at 00000000000000a8
  [ 9881.797750] IP: [<ffffffffa02766e4>] r8712_read32+0x14/0x20 [r8712u]
  [ 9881.797785] PGD 0 
  [ 9881.797796] Oops: 0000 [#1] SMP 
  [ 9881.797814] CPU 5 
  [ 9881.797824] Modules linked in: ip6table_filter ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter pci_stub vboxpci(O) ipt_MASQUERADE vboxnetadp(O) iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables vboxnetflt(O) x_tables vboxdrv(O) bridge stp snd_hda_codec_hdmi snd_hda_codec_realtek rfcomm bnep bluetooth binfmt_misc snd_hda_intel snd_hda_codec snd_ctxfi uvcvideo videodev v4l2_compat_ioctl32 i915 snd_usb_audio snd_hwdep snd_usbmidi_lib snd_seq_midi r8712u(C) snd_pcm joydev drm_kms_helper snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device drm snd lp i2c_algo_bit soundcore ppdev snd_page_alloc video shpchp parport_pc parport mei(C) psmouse mac_hid serio_raw r8169 usbhid hid btrfs zlib_deflate libcrc32c [last unloaded: kvm]
  [ 9881.798213] 
  [ 9881.798223] Pid: 1225, comm: wlan1 Tainted: G         C O 3.2.0-20-generic #32-Ubuntu MSI MS-7680/H61M-E23 (MS-7680)
  [ 9881.798268] RIP: 0010:[<ffffffffa02766e4>]  [<ffffffffa02766e4>] r8712_read32+0x14/0x20 [r8712u]
  [ 9881.798308] RSP: 0018:ffff88022f659e10  EFLAGS: 00010246
  [ 9881.798330] RAX: 0000000000000000 RBX: ffff880219ab38a0 RCX: 0000000000000005
  [ 9881.798359] RDX: 0000000000000000 RSI: 0000000010250370 RDI: 0000000000000048
  [ 9881.798387] RBP: ffff88022f659e10 R08: ffff88022f658000 R09: 000000000000035a
  [ 9881.798415] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8802308b8780
  [ 9881.798443] R13: 000000000000001d R14: ffff8802308b8dd8 R15: ffff8802315fee00
  [ 9881.798472] FS:  0000000000000000(0000) GS:ffff88023fb40000(0000) knlGS:0000000000000000
  [ 9881.798504] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  [ 9881.798527] CR2: 00000000000000a8 CR3: 0000000001c05000 CR4: 00000000000406e0
  [ 9881.798554] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  [ 9881.798582] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
  [ 9881.798611] Process wlan1 (pid: 1225, threadinfo ffff88022f658000, task ffff88023085dbc0)
  [ 9881.798643] Stack:
  [ 9881.798652]  ffff88022f659e40 ffffffffa026f5b8 ffff88022f659e50 ffff880036e20dc0
  [ 9881.798689]  ffff8802308b8780 ffff8802308b8e08 ffff88022f659e80 ffffffffa026f659
  [ 9881.798726]  0000000000000286 ffff8802308b8e18 ffff88022f659e80 ffff8802308b8780
  [ 9881.798763] Call Trace:
  [ 9881.798781]  [<ffffffffa026f5b8>] r871x_internal_cmd_hdl+0x98/0xe0 [r8712u]
  [ 9881.798811]  [<ffffffffa026f659>] cmd_hdl_filter+0x59/0x120 [r8712u]
  [ 9881.798841]  [<ffffffffa026f899>] r8712_cmd_thread+0xb9/0x250 [r8712u]
  [ 9881.798870]  [<ffffffffa026f7e0>] ? r8712_fw_cmd_data+0x50/0x50 [r8712u]
  [ 9881.798898]  [<ffffffff8108a45c>] kthread+0x8c/0xa0
  [ 9881.798922]  [<ffffffff81666674>] kernel_thread_helper+0x4/0x10
  [ 9881.798947]  [<ffffffff8108a3d0>] ? flush_kthread_worker+0xa0/0xa0
  [ 9881.798973]  [<ffffffff81666670>] ? gs_change+0x13/0x13
  [ 9881.798993] Code: 48 8b 87 40 07 00 00 48 8d 78 48 ff 90 a0 00 00 00 5d c3 0f 1f 40 00 55 48 89 e5 66 66 66 66 90 48 8b 87 40 07 00 00 48 8d 78 48 <ff> 90 a8 00 00 00 5d c3 0f 1f 40 00 55 48 89 e5 66 66 66 66 90 
  [ 9881.799134] RIP  [<ffffffffa02766e4>] r8712_read32+0x14/0x20 [r8712u]
  [ 9881.799157]  RSP <ffff88022f659e10>
  [ 9881.799167] CR2: 00000000000000a8
  [ 9881.864461] ---[ end trace c202cdf2a0fe8bfd ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-20-generic 3.2.0-20.32
  ProcVersionSignature: Ubuntu 3.2.0-20.32-generic 3.2.12
  Uname: Linux 3.2.0-20-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices: aplay: device_list:252: no soundcards found...
  ApportVersion: 1.95-0ubuntu1
  Architecture: amd64
  ArecordDevices: arecord: device_list:252: no soundcards found...
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  Date: Tue Mar 27 12:38:40 2012
  HibernationDevice: RESUME=UUID=9b3ebbe4-b26e-41d8-935f-7a88c47ea356
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120102)
  MachineType: MSI MS-7680
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-20-generic root=UUID=3d53ca44-6af4-422d-b1b0-adf30c679a2f ro quiet splash vt.handoff=7
  RfKill:
   
  SourcePackage: linux
  StagingDrivers: r8712u mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/23/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V10.8
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H61M-E23 (MS-7680)
  dmi.board.vendor: MSI
  dmi.board.version: 2.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 2.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV10.8:bd05/23/2011:svnMSI:pnMS-7680:pvr2.0:rvnMSI:rnH61M-E23(MS-7680):rvr2.0:cvnMSI:ct3:cvr2.0:
  dmi.product.name: MS-7680
  dmi.product.version: 2.0
  dmi.sys.vendor: MSI

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