double free in ExecHashJoin, 9.6.12

Server is generally running pretty well, and is high volume. This
query is not new and is also medium volume. Database rebooted in
about 4 seconds with no damage; fast enough we didn't even trip alarms
(I noticed this troubleshooting another issue). We are a couple of
bug fixes releases behind but I didn't see anything obvious in the
release notes suggesting a resolved issue. Anyone have any ideas?
thanks in advance.

merlin

*** glibc detected *** postgres: rms ysconfig 10.33.190.21(36788)
SELECT: double free or corruption (!prev): 0x0000000001fb2140 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x75dee)[0x7f4fde053dee]
/lib64/libc.so.6(+0x78c80)[0x7f4fde056c80]
postgres: rms ysconfig 10.33.190.21(36788) SELECT(ExecHashJoin+0x5a2)[0x5e2d32]
postgres: rms ysconfig 10.33.190.21(36788) SELECT(ExecProcNode+0x208)[0x5cf728]
postgres: rms ysconfig 10.33.190.21(36788)
SELECT(standard_ExecutorRun+0x18a)[0x5cd1ca]
postgres: rms ysconfig 10.33.190.21(36788) SELECT[0x6e5607]
postgres: rms ysconfig 10.33.190.21(36788) SELECT(PortalRun+0x188)[0x6e67d8]
postgres: rms ysconfig 10.33.190.21(36788) SELECT[0x6e2af3]
postgres: rms ysconfig 10.33.190.21(36788) SELECT(PostgresMain+0x75a)[0x6e456a]
postgres: rms ysconfig 10.33.190.21(36788)
SELECT(PostmasterMain+0x1875)[0x6840b5]
postgres: rms ysconfig 10.33.190.21(36788) SELECT(main+0x7a8)[0x60b528]
/lib64/libc.so.6(__libc_start_main+0xfd)[0x7f4fddffcd1d]
postgres: rms ysconfig 10.33.190.21(36788) SELECT[0x46c589]

2019-07-23 09:41:41 CDT[:@]:LOG: server process (PID 18057) was
terminated by signal 6: Aborted
2019-07-23 09:41:41 CDT[:@]:DETAIL: Failed process was running:
SELECT JR.job_id as jobId,JR.job_execution_id as
jobResultId,JR.created as lastRunDate, JR.status as status,
JR.status_message as statusMessage, JR.output_format as outputFormat,
JS.schedule_name as scheduleName, JS.job_name as reportName,
JS.created_by as scheduledBy, JS.product as source FROM (SELECT
JR.job_id, MAX(JR.created) AS MaxCreated FROM job_schedule JS JOIN
job_result JR ON JR.job_id=JS.job_id WHERE (lower(JS.recepients) like
lower($1) OR lower(JS.created_by) = lower($2)) GROUP BY JR.job_id) TMP
JOIN job_result JR ON JR.job_id = TMP.job_id AND JR.created =
TMP.MaxCreated JOIN job_schedule JS ON JS.job_id = JR.job_id AND
JS.job_type='CRON'

merlin