Wood, Dan wrote:
> There is a tangled web of issues here. With the community fix we get a
> corrupted page(invalid redirect ptr from indexed item). The cause of that is:
> pruneheap.c:
>
> /*
> * Check the tuple XMIN against prior XMAX, if any
> */
> if (TransactionIdIsValid(priorXmax) &&
> !TransactionIdEquals(HeapTupleHeaderGetXmin(htup),
> priorXmax))
> break;
>
> chainitems[nchain++] = offnum;
>
> The priorXmax is a multixact key share lock,
Uhh, what? That certainly shouldn't happen -- the priorXmax comes from
priorXmax = HeapTupleHeaderGetUpdateXid(htup);
so only the XID of the update itself should be reported, not a multixact
and certainly not just a tuple lock XID.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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