Re: [Chromium-users] segmentation fault in crserver.

[Brian P. <bri...@tu...>]

James Supancic wrote:
> segmentation fault in crserver.
> 
> I am attempting to run Sauerbraten using Chromium. I have two nVidia and 
> two ATI render SPUs.
> All four render SPUs crash, I was able to get the following stack trace 
> from the ATI SPUs.
> /lib/libpthread.so.0[0xb7ab5e87]
> [0xffffe420]
> /usr/X11R6/lib/modules/dri/fglrx_dri.so(__glim_R300TCLDrawElements+0xb5b)[0xb735e87b]
> /usr/X11R6/lib/modules/dri/fglrx_dri.so(__glim_R300TCLDrawElements+0x129)[0xb735de49]
> /usr/X11R6/lib/modules/dri/fglrx_dri.so(__glim_R300TCLDrawElements+0x129)[0xb735de49]
> /opt/cr/lib/Linux/libcrserver_crunpacker_copy.so(crUnpackExtendDrawElements+0x7b)[0xb7dfca5f]
> /opt/cr/lib/Linux/libcrserver_crunpacker_copy.so[0xb7dfbf8c]
> /opt/cr/lib/Linux/libcrserver_crunpacker_copy.so(crUnpack+0x9ed)[0xb7df8693]
> /opt/cr/bin/Linux/crserver[0x805657e]
> /opt/cr/bin/Linux/crserver[0x805669f]
> /opt/cr/bin/Linux/crserver[0x8056789]
> /opt/cr/bin/Linux/crserver[0x80567c7]
> /opt/cr/bin/Linux/crserver[0x804a537]
> /opt/cr/bin/Linux/crserver[0x804a092]
> /lib/libc.so.6(__libc_start_main+0xa6)[0xb7be23a6]
> /opt/cr/bin/Linux/crserver[0x8049fd1]
> 
> The stacktrace from the nVidia SPUs is much less interesting:
> /lib/libpthread.so.0[0xb7afcf37]
> [0xffffe420]
> 
> I have noticed that by commenting out
> cr_unpackDispatch.DrawElements( mode, count, type, (void *) indices);
> in the function crUnpackExtendedDrawElements in the file unpack_arrays.c 
> and rebuilding Chromium I am able to eliminate the segfaults (the 
> application still doesn't work, I get some output, but other things are 
> missing). Using gdb I was able to determine that none of my other 
> applications cause the crUnpackExtendedDrawElements function to be called.
> 
> Is something wrong with crUnpackExtendedDrawElements?

crUnpackExtendedDrawElements() should only be getting used if you're 
using server-side vertex arrays via the GL_ARB_vertex_buffer_object 
extension.  Are you?

Otherwise, we're probably packing/sending DrawElements() by mistake. 
What kind of config file are you using?  Tilesort?

-Brian