Excerpts from Andres Freund's message of lun jul 19 11:58:06 -0400 2010:
> On Monday 19 July 2010 17:26:25 Hans van Kranenburg wrote:
> > When issuing an update statement in a transaction with ~30800 levels of
> > savepoint nesting, (which is insane, but possible), postgresql segfaults
> > due to a stack overflow in the AssignTransactionId function, which
> > recursively assign transaction ids to parent transactions.
> It seems easy enough to throw a check_stack_depth() in there - survives make 
> check here.

I wonder if it would work to deal with the problem non-recursively
instead.  We don't impose subxact depth restrictions elsewhere, why
start now?

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