The problem was integrating the PHP plugin (nsapi ?) on Netscape/iPlanet webserver on AIX. Not the most common set up, I agree, but it was claimed to be 'supported'. Yea, I looked at the backtraces myself, but since im not a dev I couldnt get much useful info out of it, apart from the fact that the backtrace looked exactly the same over different versions of PHP. If there were specific requirements of using libfoo.so.14 instead of libfoo.so.15, then the devs could have made an effort to point me in that direction, instead of just saying over and over: 'oh, you are using an outdated version of PHP now, 3 months after you submitted your last backtrace. Now go do it again with the newest release'. Which then got the exact same results. And even if it would have 'obviously' been a problem with my compiler/linker/debugger (GCC on AIX), then it would have been helpful if the devs would have given me suggestions on what else to try besides: 'use the latest php version', even though the code that core dumped hasnt changed in eons. PHP devs suck.