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Ticket Resolution Summary Owner Reporter
#7911 obsolete Data loss when writing to hidden file within a shared folder tliebig
Description

Setup Host: Win7 Home Premium 32bit Guest: Turnkey LAMP 11.0 RC (Ubuntu Lucid Lynx) Virtualbox: 4.0.0

Error Description: When writing to a hidden file within a shared folder from the host, Virtualbox reports permission problems and ultimately empties the file.

Steps to reproduce:

  1. Setup Guest system
  2. Install Guest addititions
  3. Create a shared folder on host and mount it in guest
  4. Create a file within the shared folder from the Host (Windows) and set it's attributes to "hidden" (filename e.g. being ".htaccess")
  5. write some data into the file through the host
  6. check the file's content through the guest (all fine)
  7. then, modify the file and try to save it
  8. upon that, the system reports an permission error
  9. when the file is opened again after that, through either the host or the guest, the file is empty
  10. to verify that the error stems from the attribute, just remove the hidden attribute through the host, and save some data into file through the guest afterwards - upon which everything works as expected.

Notice: This error has been in Virtualbox for at least one year. The new 4.0.0 caused me to reevaluate the version, unfortunately with no success. Here's hoping that someone with more knowledge than me gets hold of this ticket and manages to track down/fix the exact issue.

#6843 duplicate Boot from USB device Laurence Perkins
Description

Since it is possible to attach USB devices to the guest in "pass through" mode, it would be quite useful (to me at least) to be able to boot the guest from such a device. It would allow for easy creation/testing of bootable USB devices for a variety of purposes. Currently, in order to do this kind of thing, I have to use the raw disk option, which doesn't always seem compatible with reformatting the disk, and makes it so that the guest OS doesn't realise that it's on a thumb drive, so any optimisations it may have for such circumstances are lost.

#8861 obsolete vbox netfilter spamming log - memory allocation failures Timothe Litt
Description

2P quad-core (8 logical processors) 2 GHz 64-bit VT-enabled server with 8GB, mostly idle, running Fedora Core 14.

Installed first VM - windows server 2008 SP1 (eval kit). Used an .iso image.

VM network is bridged (using the VirtualBox bridge) - a 1Gbe interface to a 1Gbe switch. The OS sees the interface normally (e.g. there's no br* device). There is an extensive iptables filter.

syslog spammed with memory allocation failures, tracebacks and statistics.

Common thread seems to be a call to write() that sends a TCP packet that hits vboxNetFltLinuxPacketHandler [vboxnetflt], which calls skb_copy where alloc_skb fails.

Without debugging - I would guess that alloc_skb should be blocking, not complaining when it can't get memory.

Attached syslog extract is mostly a single event at 08:11:56 yesterday morning. You'll note that it continues into 08:11:57. Then there's almost a 10 sec gap before it starts again.

Log also shows removal of VirtualBox 3.2 - I never actually ran a VM with it, so I can's say if this behavior is new. You can see 4.0.6 being installed.

This did continue intermittently; I stopped the syslog extract when eth0 left promiscuous mode for the first reboot.

Later in the day, I did create another 2 VMs (Fedora); only one has been run.

Attached also are the VBox.log files for the windows server VM. Note that the oldest surviving VBox.log is somewhat later than this event, but that doesn't contain these crashes. I didn't include the other VBox.log since the first failure happened hours before the second VM was defined.

I have also seen tracebacks where CIFSSMBWrite2 is calling kernel_sendmsg, so this doesn't seem limited to user mode write()s.

I suspect that this is the reason that later in the day, other processes got unhappy enough that the entire server went unresponsive and had to be rebooted. (Unfortunately, there are no logs or dumps.)

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