WebKit crashes on linux-sh4

My program with QWebView crashes when i try to use document.location in JS. I tryed to localize the problem, and and that’s what I got:

document.location=“http://…”; works
doc.write(document.location); fails
doc.write(typeof(document.location.href)); document.location = ‘http://www.foo.com/’; fails
doc.write(document.location.href); document.location = ‘http://www.foo.com/’; fails
doc.location.href = ‘http://www.foo.com/’; fails
doc.write(document.location.href); works
doc.write(typeof(document.location.href)); works

Sorry, but forum parser eats document-dot-write.

When my program crashes it receives a SIGBUS or SIGSEGV from the system. On Qt 4.7.2 all works fine, but webkit it that version has memory leaks.