Re: Why is "osprey" dumping core in REL8_2 branch?

I wrote:
> Rémi Zara <remi_zara@mac.com> writes:
>> (gdb) info locals
>> block = 0x4395000
>> chunk = 0x4395010
>> priorfree = 0x5395020
>> chunk_size = 16777216
>> blksize = 70864912
>> (gdb) p *block
>> $5 = {aset = 0x306d10, next = 0x0, freeptr = 0x5395020 <Address  0x5395020 out of bounds>, endptr = 0x5395020
<Address0x5395020 out of bounds>}
 

> Well, that's pretty dang interesting.  If the end of the block is indeed
> out of bounds as gdb claims, that'd explain why it crashes right here
> (actually the crash would be induced by the preceding line of code,
> where it tries to store a marker byte).  But how can that be, unless
> malloc is completely broken?  And if it is, why's it only affecting the
> 8.2 branch?  I'm confused.

Whoa ... osprey just went green in the 8.2 branch, following what is
most surely an unrelated patch in vacuum.c.  Can anyone explain that?
I distrust gift horses ...
        regards, tom lane