Re: ERROR: invalid memory alloc request size <a_big_number_here>

Greg Stark <gsstark(at)mit(dot)edu> writes:
> Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:
>> We'd have to make sure zero is never the *correct* value of the offset,
>> but that just means wasting one word, which seems no problem.

> In theory it's possible for only half the word to be written or even to have
> outright garbage show up. In practice I think there are no actual
> architectures where this can really happen though.

Not an issue, because we have a lock around the read or write of the
slru buffer page. The problem is that there's no lock continuously held
through the creation of a multixact entry, and we don't really wish to
add one ...

regards, tom lane