SL Baur <steve(a)xemacs.org&gt; writes: Well, you have to overwrite one very specific word in the address space, that's the only possibility. This is the only piece of data the functions depend on. None of the used functions uses malloc() or other dangerous functions. I know about the problems with wild running programs and the functions are designed for these cases. I think it is worthwhile looking into this since, as initially mentioned, the C backtrace currently possible is useless. -- ---------------. drepper at gnu.org ,-. 1325 Chesapeake Terrace Ulrich Drepper \ ,-------------------' \ Sunnyvale, CA 94089 USA Cygnus Solutions `--' drepper at cygnus.com `------------------------