Asset never generate 100% when it is large >2000 lines

Hi,

My large css and javasripts always stopped when it is large (roughly
2000 lines of CSS/JS).

I am using less-rails-bootstrap.

Anyway, the problem is not limited to less files. My another css
required normal .css also have the problem.

Any pointer will be appreciated.

Oh, I just found that the problem happened only when my nginx gzip is
on!

But I don't know why.

Arthur