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[Bug 1556471] Re: Connecting an Osprey 2 Mini (USB cellular wireless router) sometimes causes an endless reset loop or a kernel panic


OK, testing on the most recent mainstream kernel, 4.5.0, is now
complete. The Ubuntu and kernel version:

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 15.10
Release:	15.10
Codename:	wily
$ uname -a
Linux tundra 4.5.0-040500-generic #201603140130 SMP Mon Mar 14 05:32:22 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

The bug is partially fixed, and partially present:
- The reset loops still occur intermittently when the device is connected.
- However, unplugging the device during a reset loop no longer causes a kernel panic or hang. (There isn't any observable "action that happens instead"; the device stops resetting but that isn't surprising, given that it's no longer physically connected to the computer.)

I have used both fixed-upstream and exists-upstream tags because there
is still a bug with recognising the device upstream, but the worst
symptom (the panic) appears to have been fixed, leaving only a more
minor symptom. (This is the same behaviour that I observed when running
Ubuntu Vivid.) If this is incorrect, feel free to correct the tags.

The syslog from this boot, on which I plugged and unplugged the device
repeatedly, is attached.

** Attachment added: "syslog for repeated connection and disconnection on a mainstream kernel"

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

** Tags added: kernel-fixed-upstream kernel-fixed-upstream-3.5

** Tags added: kernel-bug-exists-upstream kernel-bug-exists-upstream-3.5

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  Connecting an Osprey 2 Mini (USB cellular wireless router) sometimes
  causes an endless reset loop or a kernel panic

Status in linux package in Ubuntu:

Bug description:
  Steps to reproduce (happens > 50% of the time, but not every time):

  Turn on an Osprey 2 Mini, and connect it to a USB port via a USB cable
  while both the device and computer are on (i.e. hotplug).

  Observed symptoms:
  - sometimes the Osprey 2 Mini goes into an endless reset loop (visible as the LEDs on the front of the device flashing rapidly), being reset approximately every 200ms; on such occasions, the Ubuntu user interface often reacts as though I'd inserted an audio CD containing corrupted data (e.g. via repeatedly adding an "Audio CD" icon to the launcher and then removing it, and putting up dialog boxes complaining about failure to read the data).
  - sometimes the kernel panics (often some time after the reset loop starts, perhaps up to 10 seconds); when this happens there was always or nearly always a reset loop occurring beforehand.
  - sometimes the device resets once or not at all, then works as expected (showing up as a network interface, and allowing me to communicate to the Internet with a wired connection); I'm currently using an Osprey 2 Mini for this purpose right now.

  The kernel panics lock up the entire system (forcing a hard power
  off). lt-Sysrq commands don't work in this state (even though I have
  them enabled), and sometimes the Caps Lock light flashes repeatedly.
  The logs end some time before the panic occurs.


  The reset loops also occurred when I was using Ubuntu vivid. The
  kernel panics only happened after an upgrade to wily. Output of lsusb
  -v is attached.

  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
   /dev/snd/controlC0:  ais523     6233 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 15.10
  HibernationDevice: RESUME=UUID=bfbc4bf8-2e40-4799-bbef-9c5044c87007
  InstallationDate: Installed on 2014-06-03 (648 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Hewlett-Packard HP Pavilion 15 Notebook PC
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-32-generic.efi.signed root=UUID=e92d655d-cf36-4d45-90e7-30a0f9d0949e ro quiet splash
  ProcVersionSignature: Ubuntu 4.2.0-32.37-generic 4.2.8-ckt4
   linux-restricted-modules-4.2.0-32-generic N/A
   linux-backports-modules-4.2.0-32-generic  N/A
   linux-firmware                            1.149.3
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  Tags:  wily
  Uname: Linux 4.2.0-32-generic x86_64
  UpgradeStatus: Upgraded to wily on 2016-02-18 (22 days ago)
  UserGroups: adm audio cdrom dip lpadmin plugdev sambashare sudo wireshark
  _MarkForUpload: True
  dmi.bios.date: 12/04/2013
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.42
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: 2186
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 35.12
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnInsyde:bvrF.42:bd12/04/2013:svnHewlett-Packard:pnHPPavilion15NotebookPC:pvr098B110000404100000620180:rvnHewlett-Packard:rn2186:rvr35.12:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP Pavilion 15 Notebook PC
  dmi.product.version: 098B110000404100000620180
  dmi.sys.vendor: Hewlett-Packard

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