I could narrow the reason of the segfault down. The segfault occurs only if virtual-layout is set to "js" in /etc/mediatomb/config.xml. It does not occur if it is set to "disabled" or "builtin".
If virtual-layout is set to "js" the segfault in my setup occurs if and only if the "copyObject" function is used as described at http://mediatomb.cc/pages/scripting#id2809739. As most of mediatomb's users can probably work around using copyObject, I downgraded this bug's severity to normal. Nevertheless, a segfault without a proper error message should be fixed and with the given information and the additional information, that the bug occurred with version 0.12.1-3 and probably not with version 0.12.1-2, it should be easily fixable.
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