[Opensim-users] Server causing viewers to crash

[Justin Clark-Casey]

Hi Matthew.  I haven't seen this before.  However, a quick grep of the Singularity source code reveals that "syssize" 
and "whippang" are currently unused and probably dummy names used in the unpacking of particle system data 
(llpartdata.cpp).

This suggests to me that the particle system data in one of your prims has somehow become corrupt, in such a way that it 
triggers a crash in the viewer.

If you are building OpenSimulator, an extremely quick and dirty test would be to replace

update.PSBlock = data.ParticleSystem ?? Utils.EmptyBytes;

in LLClientView.CreatePrimUpdateBlock() with just

update.PSBlock = Utils.EmptyBytes;

and see if the problem goes away.  If it does, then it is a particle system issue.  Unfortunately, then it's a case of 
elimination of anything with a particle system (I think you could get a list of such prims by looking for non-empty 
ParticleSystem fields in the prims db table).

Or if we're unlucky, it could be some other bad data in building the prim packet and this is only showing up when the 
viewer tries to unpack the particle system section.

On 11/03/14 11:27, Drover, Matt wrote:
> Somehow, something has changed on my server and all viewers are crashing when they connect to my grid.
>
> I'm running opensim v0.7.6 in grid mode. I have 15 regions spanned across 5 opensim instances. All on the same pc. The
> pc is windows server 2008 r2 and is a vm.
>
> I tested many viewers, all with the same results. Here are the errors from the singulatiry viewer log.
>
> 2014-03-10T14:20:23Z WARNING: LLDataPackerBinaryBuffer::verifyLength: Buffer overflow in BinaryBuffer length verify,
> field name crc!
>
> 2014-03-10T14:20:23Z WARNING: LLDataPackerBinaryBuffer::verifyLength: Current pos: 0 Buffer size: 1 Data size: 4
>
> 2014-03-10T14:20:23Z WARNING: LLDataPackerBinaryBuffer::verifyLength: Buffer overflow in BinaryBuffer length verify,
> field name syssize!
>
> 2014-03-10T14:20:23Z WARNING: LLDataPackerBinaryBuffer::verifyLength: Current pos: 0 Buffer size: 1 Data size: 4
>
> 2014-03-10T14:20:23Z WARNING: LLDataPackerBinaryBuffer::verifyLength: Buffer overflow in BinaryBuffer length verify,
> field name whippang!
>
> 2014-03-10T14:20:23Z WARNING: LLDataPackerBinaryBuffer::verifyLength: Current pos: 4 Buffer size: 1 Data size: 1
>
> 2014-03-10T14:20:23Z WARNING: LLDataPackerBinaryBuffer::verifyLength: Buffer overflow in BinaryBuffer length verify,
> field name whippang!
>
> 2014-03-10T14:20:23Z WARNING: LLDataPackerBinaryBuffer::verifyLength: Current pos: 5 Buffer size: 1 Data size: 1
>
> 2014-03-10T14:20:23Z WARNING: LLDataPackerBinaryBuffer::verifyLength: Buffer overflow in BinaryBuffer length verify,
> field name whippang!
>
> 2014-03-10T14:20:23Z WARNING: LLDataPackerBinaryBuffer::verifyLength: Current pos: 6 Buffer size: 1 Data size: 1
>
> 2014-03-10T14:20:23Z WARNING: LLDataPackerBinaryBuffer::verifyLength: Buffer overflow in BinaryBuffer length verify,
> field name whippang!
>
> The last 2 lines repeat about 1000 more times then the viewer crashes.
>
> Any ideas?
>
> *Matthew Drover
> *Programmer Consultant
>
> Immersive Technology
> Distance Education, Learning and Teaching Support
>
>
>
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>


-- 
Justin Clark-Casey (justincc)
OSVW Consulting
http://justincc.org
http://twitter.com/justincc