cygwin update hang on autorebase

[Xie, Wei]

I tried to update my cygwin in win7 64 bit DELL optiplex 7020 desktop 
but the process hang after downloading the update. I manually kill each 
bash.exe process and it can move to the next step but will continue 
hang. I also tried to have a complete fresh installation, the process 
hang at autorebase. After killing the dash.exe, the process hang at post 
install stage.

Thanks
--Wei
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