"Qingqing Zhou" <zhouqq@cs.toronto.edu> writes:
> In md.c/RememberFsyncRequest():

> if (hash_search(pendingOpsTable, &entry, HASH_ENTER, NULL) == NULL)
> ereport(FATAL,
> (errcode(ERRCODE_OUT_OF_MEMORY),
> errmsg("out of memory")));

> pendingOpsTable uses "MdCxt" to allocate memory. So if "out of memory", we
> actually have no chance to raise the error level to FATAL. A quick fix is to
> use malloc() HASH_ALLOC method for pendingOpsTable.

"Unsafe" is a bit of an overstatement, when you evidently haven't
analyzed the consequences of either choice of error level. That is,
why is this a bug?

regards, tom lane

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