Getting the exact same OSMesa setup as someone who has this working on many processors could help to confirm this.
A possibility is that when run on the compute nodes open gl libraries other than the one you expect are used. That can cause a strange crash. I have seen it before. If you're not doing it, prepend your mesa path to LD_LIBRARY_PATH before you launch pvserver.
I always used OSMesa configured with mesa configs. eg. "make linux", installed in my home directory, as long as I set LD_LIBRARY_PATH I never have had any troubles.
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