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[Launchpad Bug Tracker <1073688@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

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

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https://bugs.launchpad.net/bugs/1073688

Title:
  Kernel crash when unplugging ExpressCard-to-USB adaptor

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  This is a somewhat complex problem and seems to be the combination of
  two separate bugs, one present in 12.04 (kernel 3.2.0-32-generic) and
  another new in 12.10 (kernel 3.5.0-17-generic).  The problem is seen
  when unplugging an Encore Electronics ENPUH-302 ExpressCard-to-USB
  adaptor, with a generic USB thumb drive attached, from a 64-bit Intel
  Atom system.

  On 12.04, I see this message logged 20 seconds after removing the
  card: "xhci_hcd 0000:0b:00.0: Timeout while waiting for configure
  endpoint command".  If I plug the card in again during that 20
  seconds, it is not recognized (dmesg says only "pciehp
  0000:00:1c.3:pcie04: Card present on Slot(35)").

  On 12.10, the problem is worse.  The same message ("Timeout while
  waiting ...") is logged 20 seconds after removing the card.  If I plug
  the card in again during that 20 seconds, I see an additional message
  that was not printed in 12.04: "pciehp 0000:00:1c.3:pcie04: >Device
  0000:0b:00.0 already exists at 0000:0b:00, cannot hot-add".  If I then
  unplug the card, the kernel dumps a crash report (a page fault
  triggered by pci_stop_bus_device()) to the screen and the system
  freezes.

  Attached are the following logs:

  12.04/dmesg-boot.log: dmesg output when booting system with (Ubuntu 12.04)
  12.04/dmesg-insert.log: dmesg output when plugging ExpressCard in-out-in-out (Ubuntu 12.04)
  12.04/lspci-out.log: "lspci -tv" output without ExpressCard inserted (Ubuntu 12.04)
  12.04/lspci-in.log: "lspci -tv" output with ExpressCard inserted (Ubuntu 12.04)
  12.10/dmesg-boot.log: dmesg output when booting system with (Ubuntu 12.10)
  12.10/dmesg-insert.log: dmesg output when plugging ExpressCard in-out-in (Ubuntu 12.10)
  12.10/lspci-out.log: "lspci -tv" output without ExpressCard inserted (Ubuntu 12.10)
  12.10/lspci-in.log: "lspci -tv" output with ExpressCard inserted (Ubuntu 12.10)
  12.10/kernel-dump.png: snapshot of monitor showing kernel crash dump (Ubuntu 12.10)

  The testing system is the following Kontron COM on a custom board:
  http://us.kontron.com/products/computeronmodules/com+express/com+express+compact/comecpv2.html

  Let me know if you need any more info.

  John Lindgren
  --- 
  Architecture: amd64
  DistroRelease: Ubuntu 12.10
  MarkForUpload: True
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
  Uname: Linux 3.5.0-17-generic x86_64
  UserGroups:

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