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Ticket Resolution Summary Owner Reporter
#5663 fixed Manual section 5>Differencing images>1 Snapshots>C thrown away needs clarification umoeller Mark Cranness
Description

The manual says this about Restore Snapshot:

The differencing images holding all the write operations since the snapshot was taken are thrown away, and the original parent images are made active again. (If you restored the "root" snapshot, then this will be the root disk images; otherwise, some other differencing image descended from it.) This effectively restores the old machine state.

This is true when deleting the 'Current' snapshot, namely the bolded immediate parent of the 'Current State'.

However, this is ambigious and unclear when deleting any other snapshot, because the term 'the snapshot' is ambigious. The user might think that the snapshot refers to the snapshot being restored (it does not) and that the entire child tree under it will be thrown away (it will not).

Instead, how about:

The differencing images associated with the current machine state are thrown away, and...

#5674 fixed BSOD when USB & Uniprocessor HAL * VT-x/AMD-V Mark Cranness
Description

Enabling USB on an existing Windows VM that did not have USB enabled causes a BSOD on the second boot after Windows has installed USB drivers.

Affects 3.1.0 r55467. The same steps do not affect 3.0.10 or 3.0.12 (There are other similar reports on Windows XP guests, but presumably on VMs that always has USB; they will not boot anymore.)

Reproduce:

Windows 2000 Server VM with NO USB controllers OR drivers installed: 'set devmgr_show_nonpresent_devices=1& start devmgmt.msc' and Uninstall any USB controllers with Device Manager.

Enable USB in VirtualBox and boot VM. Windows recognizes USB and installs drivers. Shutdown and reboot gives BSOD as below:

*** Stop: 0x0000001E (0xC0000005,0x8046ACC8,0x00000000,0x00000000)
KMODE_EXCEPTION_NOT_HANDLED
*** Address 8046ACC8 base at 80400000, DateStamp 4a781d9e - ntoskrnl.exe

... BSOD occurs (80%+ of the time) when all of these conditions are true:

  • Uniprocessor version of ntoskrnl.exe in use.
    This means 'ACPI Uniprocessor PC' HAL or 'Advanced Configuration and Power (ACPI) PC' HAL.
    (When 'ACPI Multiprocessor PC' HAL is installed, ntoskrnl.exe == ntkrnlmp.exe, and boot is OK.)
  • USB host controllers recognised in Device Manager and drivers installed.
  • Guest Additions installed. 3.0.10 or 3.1.0 beta1,2,3,release does not matter: they all BSOD.
    (If Guest Additions are not installed then boot is OK.)

Because VT-x/AMD-V is involved, my CPU might be significant: Intel Core 2 Duo E8400 E0.

Logs and more description here: http://forums.virtualbox.org/viewtopic.php?f=15&t=24753

#5824 fixed Make Close/shutdown radio button options and default selection user configurable Mark Cranness
Description

When you Close a VM a dialog appears with options to Save state, ACPI Power button, Power off, with sub-option of Restore Current Snapshot.

Once one of the options is selected, it is remembered and will be the default used next time Close is used.

This default selection has caused people to lose work, when they do not expect the default value to be used.

Typically, a user may select Power down and Restore Current Snapshot once (which selects that option as the default value). Then for some weeks they shutdown the VM using the normal guest OS shutdown commands, then weeks later use the Close feature but not check carefully enough the now default option and lose data.

Could some user configurability be added to the options, such as to set an explicit default value from the Settings dialog, or VirtualBox-wide setup options?

If the user sets an explicit default value (or an explicit "no default" value), then that default value is always used and any changed option selected when the dialog is used is forgotten: The configured default value is always used.

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