Re: Incomplete freezing when truncating a relation during vacuum

Noah Misch <noah@leadboat.com> schrieb:
>On Sun, Dec 01, 2013 at 06:56:10PM +0100, Andres Freund wrote:
>> On 2013-12-01 12:49:40 -0500, Noah Misch wrote:
>> > This system had multiple problems, a missing pg_subtrans file and a
>missing
>> > TOAST chunk for pg_attribute.  I don't see a pg_clog problem
>connecting it to
>> > the freeze bug at hand.
>> 
>> Those all sound like possible problems caused by the bug, no?
>
>pg_subtrans has a lifecycle unrelated to datfrozenxid.  I am not aware
>of a
>mechanism connecting that problem to the bug at hand.

TransactinIdIsInProgress returns true for future xids. Which triggers the use of XactLockTableWait. Which then does
SubtransGetParentof a far future xid...
 

Andres

-- 
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Andres Freund                       http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services