I found a workaround:
The bug seems to originate from the Oxygen GTK engine and only appears
at the first run of Gimp, some initialization function I think
(user_install_dialog_new ff. in the stack trace).
When I changed the widget style in KDE control center (GTK styles in
Application Appearance) from "oxygen-gtk" to "simple" , I could start
Gimp without a crash. After changing back to "oxygen-gtk", starting Gimp
doesn't crash anymore.
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https://bugs.launchpad.net/bugs/778414
Title:
gimp crashes on starting (segfault)
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