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So, yes it is all fault of abrt and Pulseaudio. When the backtrace was regenerated from the coredump via plain
gdb -nx --batch -ex 'thread apply all backtrace' \
empathy coredump >emapthy-backtrace-coredump 2>/dev/null
it shows clearly that the crash is in pulseaudio.
This bug appears to have been reported against 'rawhide' during the Fedora 12 development cycle.
Changing version to '12'.
More information and reason for this action is here:
http://fedoraproject.org/wiki/BugZappers/HouseKeeping