Servus
I can confirm, that remooving bad pixel from 600D raw-files is a problem. dcraw (ufraw) fails, darktable too. The only prog here on Linux is RawTherapee, that succeed, But this cannot be used for dual-iso pics, because the romooval has to be done before interpolation, I guess.
I looked at the code of cr2hdr and saw, that the badpix-remooval funktion only works on the dark lines of the pic. That´s not enough for 600D. So I changed the code for to work with the bright side of life

too and compiled the module new,
With this test-change all badpix are remooved! Only on the border of the image some new ones are created, what is no problem for cutting out in postprocessing.
In my eyes, this function should be extended, to work with the whole image. And it would be fine to append this function to raw2dng and mlv_dump.
Edgar