check the vardir/log directory for a file that is approx. 2 gig. The problem is related to debug being left on and a file is approx. 2 gig. The process is trying to write to the file. move the log.opo log.ocap or log.ord file to a new name and restart the process.
If the process continues to run you can unset the debug by typing the line for the process.
sp_ctrl> set param SP_OPO_DEBUG_FLAG 0x00000000
sp_ctrl> set param SP_ORD_DEBUG_FLAG 0x00000000
sp_ctrl> set param SP_OCT_DEBUG_FLAG 0x00000000
sp_ctrl> activate param
the process will now need to be stopped and started for the debug to be unset.