Upon visiting https://competitions.codalab.org Konqueror 4.14.26 immediately segfaults. It offers to produce a backtrace for me, but it's been stuck on "Generating backtrace… (this may take some time)" (using 100% CPU) for five minutes now. If it ever terminates, I'll attach the backtrace. Otherwise, consider this to be a hang as well as a crash…
15 minutes and it still claims to be generating the backtrace. I'm just going to kill it. I tried opening the same page on another machine with Konqueror 4.14.8 and it worked fine.
No longer reproducible for me when visiting the live version of https://competitions.codalab.org with Konqueror 20.08.1.