Opened 13 years ago

Closed 8 years ago

#8298 closed defect (fixed)

VBoxSVC.exe and VirtualBox.exe load VBoxC.dll several times per second [FIXED IN SVN]

Reported by: Bjoern Hoehrmann Owned by:
Component: other Version: VirtualBox 4.0.2
Keywords: Cc:
Guest type: other Host type: other


I've noticed strange drive access patterns when running VirtualBox 4.0.2 on Windows Server 2008 (a clean install with only service packs and updates applied) and used Microsoft's Process Monitor to see what's going on. It turns out that VBoxSVC.exe and VirtualBox.exe load VBoxC.dll several times per second, read a couple of bytes and then close the file again. This happens with 4.0.2 and 3.2.12, it does *not* happen with 3.1.0 which is the version I've used so far. This only happens when a guest is running (a linux version in my case, I've not tried any other). If no guest is running the file is not loaded again and again.

Attachments (1)

Logfile.PML (221.8 KB ) - added by ianxxx 9 years ago.
Procmon log

Download all attachments as: .zip

Change History (8)

comment:1 by Nikolay Igotti, 13 years ago

I can confirm this behavior, and it seems (from stack trace in Process Monitor) that this behavior is result of COM marshalling/demarshalling process (when remote object is created or maybe called). I'm unsure why you consider that being a bug, and also curious if you see similar behavior with other out-of-process COM servers?

comment:2 by gaborca, 12 years ago

"I'm unsure why you consider that being a bug"

I also noticed this behaviour, because I've got a relatively old harddrive, I keep hearing the seek sounds while I run VirtualBox, so I think it wears the device. It keeps reading the same few hundred bytes all the time.

comment:3 by theallmighty, 10 years ago

same for the latest at moment 4.3.10 r93012 high load once a perioud, checked in the guest (winxp) - nothing happens, checked with procmon on host - constant "read file" operation on vboxc.dll

comment:4 by sunlover, 10 years ago

theallmighty, please attach the procmon log. I could not reproduce the problem.

comment:5 by Mihai Hanor, 10 years ago

This is how the stack looks like, for a VirtualBox.exe thread, when it opens/closes VBoxC.dll:

And VBoxSVC:

by ianxxx, 9 years ago

Attachment: Logfile.PML added

Procmon log

comment:6 by ianxxx, 9 years ago

Same problem here with Virtualbox 5.0.12

I did attach Procmon log.

comment:7 by bird, 8 years ago

Resolution: fixed
Status: newclosed
Summary: VBoxSVC.exe and VirtualBox.exe load VBoxC.dll several times per secondVBoxSVC.exe and VirtualBox.exe load VBoxC.dll several times per second [FIXED IN SVN]

Another developer and I noticed this behavior some years ago and finding it kind of excessive as well. We suspect VBoxC.dll is being opened for reading/checking the type library so COM can make an object in VBoxSVC.exe accessible to a client process.

Thanks to ianxxx bringing this up again. Reminded me to spend some time completing a hopeful solution to this behavior. We are testing it and hope to ship it in the next major release of VirtualBox (sorry, won't appear in 5.0.x, too risky).

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