Re: Avoid memory leaks during base backups

At Tue, 27 Sep 2022 11:33:56 +0530, Bharath Rupireddy  wrote in 
> On Mon, Sep 26, 2022 at 7:34 PM Tom Lane  wrote:
> > This ... seems like inventing your own shape of wheel.  The
> > normal mechanism for preventing this type of leak is to put the
> > allocations in a memory context that can be reset or deallocated
> > in mainline code at the end of the operation.
> 
> Yes, that's the typical way and the patch attached does it for
> perform_base_backup(). What happens if we allocate some memory in the
> new memory context and error-out before reaching the end of operation?
> How do we deallocate such memory?

Whoever directly or indirectly catches the exception can do that.  For
example, SendBaseBackup() seems to catch execptions from
perform_base_backup(). bbsinc_cleanup() is already resides there.

regards.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center