Re: pg11.5: ExecHashJoinNewBatch: glibc detected...double free orcorruption (!prev)

On Mon, Aug 26, 2019 at 12:01 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
> Justin Pryzby <pryzby@telsasoft.com> writes:
> > On Mon, Aug 26, 2019 at 12:45:24PM -0400, Tom Lane wrote:
> >> However ... there is some pretty interesting info at
> >> https://bugzilla.redhat.com/show_bug.cgi?id=1338673
> >> suggesting that compiling with a late-model gcc against older RHEL6
> >> headers could result in bad code.  I wonder whether the reporters'
> >> servers were built using such a configuration.  (Although the linkage,
> >> if any, to this report still wouldn't be very clear.)
>
> > I can tell it was compiled using
> > version | PostgreSQL 11.5 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23), 64-bit
>
> Ah, that appears to be the default compiler for RHEL6, so that theory
> is out the window.  It's still interesting that we're only seeing this
> reported from RHEL6 ... maybe there's something specific to the code
> that this gcc version generates?

FWIW, I've got the same compiler (which is natural, we are likely
using the same packaging):
PostgreSQL 9.6.12 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.4.7 20120313
(Red Hat 4.4.7-23), 64-bit

merlin