Thread: BUG #15003: pg_terminate_backend does not work

The following bug has been logged on the website:

Bug reference:      15003
Logged by:          Sigitas Vysniauskas
Email address:      sigutis@gmail.com
PostgreSQL version: 9.6.5
Operating system:   centos-release-7-4.1708.el7.centos.x86_64
Description:

pg_terminate_backend returns true, but it does not terminates backend.

pg_stat_activity:
application_name - "pg_cron"
client_addr - "::1"
state - "active"
query - "select sync_devices_run()"

PostgreSQL 9.6.5 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5
20150623 (Red Hat 4.8.5-11), 64-bit

On Thu, 11 Jan 2018 08:43:27 +0000
PG Bug reporting form <noreply@postgresql.org> wrote:

> pg_terminate_backend returns true, but it does not terminates backend.
>
> query - "select sync_devices_run()"

Does the function sync_devices_run() do any sort of IO other than database
queries? pg_terminate_backend() can only terminate queries that are running
postgresql code, so if the function is making a blocking system call for
example, network IO pg_terminate_backend() can't do anything.


-dg

-- 
David Gould                                   daveg@sonic.net
If simplicity worked, the world would be overrun with insects.