Hello,

I believe I have found a bug in the O3 cpu model. I have simply adjusted the 
renameWidth from 8 to 16 in src/cpu/o3/O3CPU.py. Doing this causes the commit 
unit to seg fault at line 1286 in src/cpu/o3/commit_impl.hh.

It appears the fromRename buffer size is incorrect (value of 55356032). This is 
causing the loop to access invalid locations in the fromRename buffer.

This is with the latest gem5-stable.

command line: build/ALPHA/gem5.debug configs/example/se.py --cpu-type=detailed 
--caches -c $BENCHMARK

Thanks,
Jordan

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