Bug#568381: debconf segfauls with DEBIAN_FRONTEND=text

[Frans Pop <elendil@planet.nl>]

On Thursday 04 February 2010, Martin Michlmayr wrote:
> Marko Jung reported that d-i segfaults when you use
> DEBIAN_FRONTEND=text.  I can reproduce this.

I've traced this to Colin's commit that adds the "passthrough" frontend 
(r59807). If I revert that the text frontend works fine again.

It may possibly have something to do with the progress bar STEP increasing 
to a value higher than the specified maximum, but that's a guess.

Someone more at home in C than I will have to look deeper than that.

Colin, do you have time?

Cheers,
FJP