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[Jon-o Addleman <jono@xxxxxxxxx>]

And it appears I've spoken too soon again - I had the exact same crash
happen (the 2nd stack track in the log above) using the 3.16 kernel that
used to work well! That kernel didn't have the first trace though, so it
does work somewhat better than newer ones.

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https://bugs.launchpad.net/bugs/1177394

Title:
  USB  sequence errors in snd_usb_usx2y

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Using kernel 3.8.0.19.35, when I plug in my Tascam us-122 usb audio
  device, the log fills up with many of the following messages as soon
  as the firmware is loaded:

  May  5 18:40:31 scaph kernel: [64138.774214] Sequence Error!(hcd_frame=391894 ep=10out;wait=391892,frame=391890).
  May  5 18:40:31 scaph kernel: [64138.774214] Most probably some urb of usb-frame 391892 is still missing.
  May  5 18:40:31 scaph kernel: [64138.774214] Cause could be too long delays in usb-hcd interrupt handling.

  The device seems to initialize properly, but any attempt to actually
  use it (starting jackd for example) results in a few more of those
  messages in the log, and the program fails to connect to the device.

  This is very similar to a bug that cropped up several years ago -
  here's a thread I made on the alsa-user list back in 2006 (!) about
  that one: http://www.mail-archive.com/alsa-
  user@xxxxxxxxxxxxxxxxxxxxx/msg18003.html That bug was fixed in  2.6.18
  so I don't know if it might be actually related or not.

  In any case, I've temporarily solved the issue by downgrading to
  quantal's kernel, 3.5.0-28, which doesn't have the bug.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-generic 3.8.0.19.35
  ProcVersionSignature: Ubuntu 3.5.0-28.48-generic 3.5.7.9
  Uname: Linux 3.5.0-28-generic i686
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jono       1741 F.... pulseaudio
  Date: Tue May  7 09:31:02 2013
  HibernationDevice: RESUME=UUID=21e8f32e-d542-4900-ac9c-2ade76ed3084
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: LENOVO 170237U
  MarkForUpload: True
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-28-generic root=UUID=860958bf-acf0-48eb-abb6-acd3022e5a9c ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-28-generic N/A
   linux-backports-modules-3.5.0-28-generic  N/A
   linux-firmware                            1.106
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2013-04-13 (23 days ago)
  WifiSyslog:
   
  WpaSupplicantLog:
   
  dmi.bios.date: 03/31/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7BETD8WW (2.19 )
  dmi.board.name: 170237U
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr7BETD8WW(2.19):bd03/31/2011:svnLENOVO:pn170237U:pvrThinkPadX60s:rvnLENOVO:rn170237U:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 170237U
  dmi.product.version: ThinkPad X60s
  dmi.sys.vendor: LENOVO

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