Re: [HACKERS] ERROR: btree scan list trashed ??

Adriaan Joubert <a(dot)joubert(at)albourne(dot)com> writes:
> OK, I've dropped my user-defined type index and it hasn't made any
> difference. I've had quite a few of the following again:

> UPDATE TasksIds SET qstate=8::bit1 where task=358 and id=5654
> ERROR: btree scan list trashed; can't find 0x1401744a0

> I've got a lot of logging switched on, and these do not seem to be
> preceded by errors. Since patching it the system seems to recover ok, so
> I'm wondering whether this could be a caching issue. I think I will just
> lock all tables in their entirety now, and see whether that fixes it
> (there goes my MVCC performance boost 8-(). I still think it has
> something to do with concurrent access to the indices.

Let us know whether going to full locking makes any difference.

I am currently wondering whether this is a porting issue (64-bit vs
32-bit pointers). If it only happens on 64-bit platforms, that would
explain why we haven't seen many similar reports. Unfortunately,
that theory provides little useful guidance about where to look :-(

regards, tom lane