DKG-967908 (6/21/2013)
why don’t you recycle SQL error log by exec sp_cycle_errorlog.
It's not that his error log is growing, it's that SQL is stack dumping and writing large stack dumps into the error log directory. The running out of space is a symptom, the problem is that SQL is stack dumping.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability