Unfortunately (this some kind of Murphy on bugs) now I can't find an easy was to reproduce the bug, however downloading various things (mostly eg from gmail.com when mail with attachment arrives and I want to download and save that) does that. I can't exactly know how can I produce backtrace when no fatal signal arrives which would interrupt the running program. So I'm attaching a backtrace now, the first one issues after attaching the running process, the second one after some time (after "continue") when I send a STOP signal to the epiphany process. Hope it helps, if no, please suggest some better method for me.
** Attachment added: "Backtrace" http://librarian.launchpad.net/4923462/gdb-epiphany.txt -- 100% CPU usage after a download on AMD64 https://launchpad.net/bugs/66814 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs