I found some semi-recent messages related to this in 9.0.x, but wanted to confirm for anybody searching that the same issue exists in 9.2.x. It crashes for me with a similar backtrace as [Laurentius Purba’s][1]. The same fix/workaround applies as well: Compile libxml2 without the “threads” option.
If I’m understanding the explanations correctly, the issue is that libxml2+threads expects something to be initialized by the calling program (postgres), but since the program isn’t multithreaded, this doesn’t happen. It sounds like something that neither side can really fix, but if I’m wrong and any devs would like a core file, I can provide one.