Dmitry Ivanov wrote:
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.
Forgot some curly braces, my bad. v2 attached.
Good catch. But in 9.6 it has been fixed by
db0f6cad4884bd4c835156d3a720d9a79dbd63a9 commit.
--
Yury Zhuravlev
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company
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