emacs -Q
C-x C-f /tmp/tmp.c (should be in c-mode)
Copy the following c code and paste it to the new buffer, then
emacs freezes.
-------------xxxx-----------------
LONG Rounding(
IN PRTMP_ADAPTER pAd,
IN LONG Integer,
IN LONG Fraction,
IN LONG DenominatorOfTssiRatio)
-------------xxxx---------------