I'm writing an extension running on background workers and found get_database_name() causes SEGV and found internally resource owner was wet to NULL. Could anybody let me know how it happens and how I can use this function. Argument to get_database_name() looks correct.
I think the main question is answered; if the advice given does not help please supply your code and a backtrace from the crash obtained from a core file.
However, this reminds me of something. I'd like to make our syscache/relcache/catcache and all snapshot access functions Assert(IsTransactionState()); directly or at key locations. That'd make these mistakes much more obvious - and as bgworkers become a more popular way to write code for PostgreSQL that's going to be important.
Similarly, it might make sense to assert that we have a valid snapshot in the SPI, which we don't presently do for read-only SPI calls. I recall that one biting me repeatedly when I was learning this stuff.
