cannot remove lock from HTAB

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Hi all,
I'm not able to reproduce it anymore but I seen this after a
deadlock detection involving a subtransaction:

ERROR: deadlock detected
DETAIL: Process 31330 waits for ShareLock on transaction 570; blocked by process 31328.
Process 31328 waits for ShareLock on transaction 572; blocked by process 31330.
regression=# abort;
WARNING: cannot remove lock from HTAB
ROLLBACK

I don't have any HTAB around!!

Basically this is what I did:

begin; begin;
update record 1; savepoint a;
~ update record 2;
update record 2;
~ update record 1;
~ <dead lock detected>

I hope that looking at the code is possible understand what the problem is
( if exists ).

Regards
Gaetano Mendola

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