[Qemu-devel] [Bug 1185888] [NEW] -device nec-usb-xhci (usb 3) breaks VM snapshots

[Guido De Rosa]

Public bug reported:

Enabling the USB 3.0 controller apparently breaks "live" snapshotting.

To reproduce:

    $ qemu-system-x86_64 -device nec-usb-xhci vm.qcow2

then, at the Monitor:

    (qemu) savevm
    Error -22 while writing VM
    (qemu) 

Instead, if I remove -device nec-usb-xhci from the cmdline, everything
works fine.

Some QEMU and OS info:

    $ qemu-system-x86_64 -version
    QEMU emulator version 1.5.0, Copyright (c) 2003-2008 Fabrice Bellard

    $ uname -a
    Linux localhost 3.2.0-4-amd64 #1 SMP Debian 3.2.41-2 x86_64 GNU/Linux

The same also happens with 1.4.2. All compiled from source, not Debiabn
package (btw, this *also* happens with distro packages/older versions).

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: snapshot usb usb3

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https://bugs.launchpad.net/bugs/1185888

Title:
  -device nec-usb-xhci (usb 3) breaks VM snapshots

Status in QEMU:
  New

Bug description:
  Enabling the USB 3.0 controller apparently breaks "live" snapshotting.

  To reproduce:

      $ qemu-system-x86_64 -device nec-usb-xhci vm.qcow2

  then, at the Monitor:

      (qemu) savevm
      Error -22 while writing VM
      (qemu) 

  Instead, if I remove -device nec-usb-xhci from the cmdline, everything
  works fine.

  Some QEMU and OS info:

      $ qemu-system-x86_64 -version
      QEMU emulator version 1.5.0, Copyright (c) 2003-2008 Fabrice Bellard

      $ uname -a
      Linux localhost 3.2.0-4-amd64 #1 SMP Debian 3.2.41-2 x86_64 GNU/Linux

  The same also happens with 1.4.2. All compiled from source, not
  Debiabn package (btw, this *also* happens with distro packages/older
  versions).

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