I need help very fast.

[Aiman Omary]

Dear sir
i am running the b_eff_io bench mark on a 5 node cluster under PVFS2, one
node for the I/O and the same node is server and metadata node. and the
other 4 nodes are clients. recently when i run the bench mark i get this
error messege and i don't know what it is means and what is the solution.
i hope from you that you can help me as son as you could.
note: when all the nodes were I/O nodes it was working perfect.
thanks for every body
the error is 
p0_32297:  p4_error: interrupt SIGSEGV: 11