[vbox-dev] Guests abort when resizing

Perry Halbert phalbert at cox.net
Wed Jul 25 07:21:39 PDT 2012

gdb shows:

Program terminated with signal 11, Segmentation fault.
#0  0x00007f717ea0f4e2 in VNCServerImpl::VRDEUpdate 
(hServer=0x7f7178002bc0, uScreenId=<optimized out>, 
pvUpdate=0x7f7153fe0338, cbUpdate=<optimized out>) at 

libvncserver0 =

Dump is over 200MB.  Needless to say this is going to take sometime for 
me to figure out.  I can ftp it to appsdev if you like.

On 07/25/2012 07:00 AM, Klaus Espenlaub wrote:
> On 24.07.2012 03:12, Perry Halbert wrote:
>> Update. I turned off the remote display and this solved the issue.
>> I use VNC and build the extension pack which has been working really well.
>> So is there a way to get this back to operational status or do I need to
>> switch back to VRDP?
> My suspicion is that the VM process crashes... can you enable core dumps
> to see if this hypothesis is right, or run the VM process directly in
> gdb? You build everything yourself, so it shouldn't be a problem to have
> the debug info available. Could be that your libvncserver is newer and
> has a slightly incompatible API somewhere.
> I've tried a similar setup (VBox trunk, matching GA, VNC enabled, VT-x
> disabled), but I couldn't get any crashes. Used a different guest OS and
> a different linux distro on the host, but this shouldn't really have a
> significant influence. Tried with and without a VNC viewer connected.
> I guess that you run the VM in the GUI, because I wasn't able to find a
> VNC viewer which would trigger resizes when its window is resized.
> Any obvious patterns for the resize resolution (we removed a "multiple
> of 4" restriction for the horizontal resolution recently) which causes
> crashes? Does it ever survive a resize?
> Klaus
>> On 07/23/2012 06:27 PM, Perry Halbert wrote:
>>> Strange issue this time.
>>> Latest batch of builds, not sure exactly when, but within the last
>>> week. When resizing the guest (mouse click drag) it aborts. Nothing in
>>> the guests log file (no shut down, resize information, or reason it
>>> just stops recording) or syslog of the guest. Just like you pulled the
>>> plug. Only indication is the main manager shows aborted.
>>> Host Ubuntu 12.04 x86_64 (no VT-x)
>>> Guest Ubuntu 12.04 X86_32 with PAE
>>> Everything else works good, including all new features, well except it
>>> is really slow and has been for some time, but usable to test with.
>>> I increased the vRAM to 64MB from 12MB but that does not seem to be
>>> the issue.
>>> I removed Version matching GAs and installed 4.1.18, but no change so
>>> I don't think it is the GAs.
>>> Turned off 3D so that is not the issue.
>>> Note: I do not see this on a matching Ubuntu host with VT-x.
>>> Didn't I say strange?
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