> rivendell 541: cc foo.c -o foo
> rivendell 542: ./foo
> Start
> Segmentation fault (core dumped)
> rivendell 543:
>
> I'd say that's a pretty good indication.

 Oi, great. Thats more promising for bug hunting than my pseudo fault :)

> Program received signal SIGSEGV, Segmentation fault.
> 0x480dea04 in vfprintf_unlocked () from /usr/lib/libc.so.12
> (gdb)

 This is what I had hoped for -- vfprintf() does crash in PHP 4.3.3 when
using setlocale().

 And now? How to trace wihtin libc?

Markus Illenseer