by scanning PROC structures of all running backend.

PROC structure (it's for new TransactionIdIsInProgress func).

and to InvalidTransactionId in CommitTransaction & AbortTransaction
(it's for new TransactionIdIsInProgress func).

"may be used before being set" warnings.

memory allocation for ItemPointerData of heap' tuple is useless
because of FormRetrieveIndexResult makes neccessary palloc.

memory allocation for ItemPointerData of heap' tuple is useless

because of FormRetrieveIndexResult makes neccessary palloc.

memory allocation for ItemPointerData of heap' tuple is useless
because of FormRetrieveIndexResult makes neccessary palloc.

D'Arcy J.M. Cain                           |  Democracy is three wolves

D'Arcy J.M. Cain                           |  Democracy is three wolves

When an acl item is added or updated the new entry is deleted if it has no
permissions and the acl array is shrinked. This is is done by decrementing
the number of items without updating the corresponding array size.
The array with the incorrect size is later read by pg_aclcheck and the entry
count is used to allocate a new array while the array size is used to copy
the old one. This causes a memory corruption and a backend crash.
This happens only to normal user as the administrator bypasses acl checks.
Massimo Dal Zotto