VirtualBox

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Ticket Resolution Summary Owner Reporter
#9067 obsolete Linux kernel warnings when trying to remount a shared folder Eugene
Description

When I try to remount a shared folder on a Linux guest, it fails and the guest kernel issues several warnings that may indicate that some problem has occured. The steps to reproduce are as follows:

First I mount a shared folder "vbshare" to /mnt/shared:

#> mount -t vboxsf vbshare /mnt/shared

So far so good. Now I try to remount it read only:

#> mount -t vboxsf -o remount,ro vbshare /mnt/shared 
/sbin/mount.vboxsf: mounting failed with the error: Invalid argument

In the system log on the guest there are several warnings triggered in the kernel during the execution of sf_read_super_26() (see the attached system.log file for details):

  • WARNING: at /build/buildd/linux-2.6.38/fs/sysfs/dir.c:455 sysfs_add_one+0xc8/0xf0()

Hardware name: VirtualBox sysfs: cannot create duplicate filename '/devices/virtual/bdi/vboxsf-vbshare'

  • kobject_add_internal failed for vboxsf-vbshare with -EEXIST, don't try to register things with the same name in the same directory.
  • And 3 more.

At the end, the log shows that sf_read_super_aux() returned -EINVAL (-22) and mounting failed indeed.

Guest: Ubuntu 11.04 x64, kernel 2.6.38-8-generic, this problem showed up on other systems too.
Host: Windows XP SP3

#9603 fixed NULL pointer dereference in vboxdrv on the host when shutting a guest OS down Eugene
Description

Host OS: OpenSUSE Linux 11.3 32-bit
Guest OS: the problem was observed with different guest Linux systems including Mandriva 2010 and Fedora 12
VirtualBox 4.1.2 installed from the recommended repository

Sometimes when I shutdown the guest system, a NULL pointer dereference occurs in vboxdrv at rtR0MemObjLinuxFreePages+0x14/0x90 (see the relevant portion of the system log attached).

The guest system itself seems to be shut down correctly.

The problem does not reproduce each time I shutdown a guest OS. Among several dozens of VM shutdowns I did this week, I saw this problem only twice.

The host system has no hardware virtualization support, so nested paging is not used among other things. PAE is not enabled for the guest systems either. Therefore, it is probably not related to bug #7930 as I thought earlier.

May be it is nothing but there is a probably interesting thing in the system log. It looks like the problem occured before the network interface finished cleaning up. Before the oops report, there is a message:

[75613.447367] device vboxnet0 entered promiscuous mode

and after the report - the following message:

[85715.717558] device vboxnet0 left promiscuous mode

Attached is the portion of the system log, the VM log (F12_VBox.log) and the VM configuration (F12.xml).

#2042 fixed Add VDI immutable setting to the GUI Tomasz Szlagowski
Description

Let's say I've got 512 MB ram and want to try 3 different linux livecds. To be able to work with them, I need to add a virtual disk and create a swap partition on it. I create such a disk and add it to one of the 3 virtual machines (each for different mounted iso).

Currently it's impossible to add the same disk to another machine without releasing it first (correct me if I'm wrong).

I've got 3 options:
a) create 3 disks, - waste of disk space
b) have 1 machine and change the iso to mount every time i want another distro, - pain in the ass
c) release and reattach the disk every time i want another distro. - pain in the ass

What I'd like to see in VirtualBox:
Instead of not allowing to attach an already attached disk, give a warning that you shouldn't do that. When running a machine with such shared disk give an error (when the disk is used by another one) or a warning (if it isn't).

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