My gut feeling tells me that there is a bug that sometimes leads to crash and sometimes not (similar to "use after free"), and that that bug is not necessarily in camera-ui2 itself. Having a coredump from such a crash is way more easier and (usually) brings way more information (even if the crash happens rarely) than putting g_debug() in every function camera-ui2 consist of. Not to say that UI (camera-ui2) is the cherry on the top, there is a pile of libs involved as well. Also keep in mind that adding such log capabilities will change the memory layout of the application, so it may become impossible to recreate the crash or instabilities.