Recently I've encountered a strange crash while calling elog(ERROR, "...")
after the WaitForBackgroundWorkerShutdown() function. It turns out that
_returns_ inside the PG_TRY()..PG_CATCH() block are *highly* undesirable,
since they leave PG_exception_stack pointing to a local struct in a dead
frame, which is an obvious UB. I've attached a patch which fixes this behavior
in the aforementioned function, but there might be more errors like that
elsewhere.
--
Dmitry Ivanov
Postgres Professional: http://www.postgrespro.com
Russian Postgres Company
