[Opensim-users] Server causing viewers to crash

[Justin Clark-Casey]

On 13/03/14 01:26, Matthew Drover wrote:

It's particle effects [1].  Disabling it will stop any showing up and they have quite a few uses so wouldn't be a 
permanent solution.  This is just to get some idea of whether your problem is due to some corrupt data there or 
somewhere else.

[1] http://wiki.secondlife.com/wiki/LlParticleSystem

> Thanks, I’m looking into it now.
>
> What exactly is the ParticalSystem? If I disable it, how will me prims suffer?
>
> -Matthew
>
>
> On 2014-03-11, 4:57 PM, "Justin Clark-Casey" <jjustincc at googlemail.com> wrote:
>
>     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
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-- 
Justin Clark-Casey (justincc)
OSVW Consulting
http://justincc.org
http://twitter.com/justincc