The backtrace looked quite similar to the one in this bug report:
https://bugs.webkit.org/show_bug.cgi?id=110017
But that should be fixed since two years.:\
OTOH, I cannot reproduce a crash on the sites mentioned in that bug report. So it’s probably not related. (or the sites have changed…)
The crash happens in akregator (where I first noticed it), in rekonq and in konqueror.
All of them use libQtWebKit4.
Recently, I have been doing the login with akregator, and reading the forum with rekonq. I guess I can switch konqueror to KHTML, turn off adblock in konqueror, and go back to using akregator to login (it seems to be using konqueror or konqueror settings behind the scenes), and read the forums with rekonq which will still use WebKit.
You could also switch back to WebKit in Konqueror after logging in, or only switch to KHTML for logging in via the “View” menu.
Akregator uses the “KDE service association” for text/html (i.e. either khtml or kwebkitpart, which you can configure in Konqueror’s settings), just like Konqueror does.
So yes, it does use the “konqueror settings” for the HTML engine.
Something changed since Monday. I’m not sure what.
Probably. I cannot tell when I last tried to login using WebKit.
Still, WebKit shouldn’t crash.
I tried with other WebKit based browsers (rekonq5 and epiphany), and couldn’t reproduce the crash there, so it seems to be specific to QtWebKit4 (maybe it’s just too old? :P)
Unfortunately Qt4 is not really in development any more AFAIK (although I think there will still be a final bugfix release), and WebKit is even deprecated in Qt5 as they added Chromium’s engine (which was originally based on WebKit) recently instead, so I’m not really confident that this has a chance to be fixed…