Hi all, Have you seen something like the following in your worker-error.log? 20231018 07:44:06 instance-koha-worker-long_tasks: client (pid 3949888) killed by signal 13, respawning 20231019 07:21:26 instance-koha-worker-long_tasks: client (pid 4082852) killed by signal 13, respawning I found some discussion in a thread https://www.mail-archive.com/koha@lists.katipo.co.nz/msg30046.html Signal 13 would be a SIGPIPE I believe. At first, I assumed it was the connection between the background worker and RabbitMQ, but based off the RabbitMQ logs[1] that seemed unlikely. MariaDB is another possibility. Looking at its logs [2] and I see some timed out connections. I might monitor the connections between the background workers and the database tonight and see if it's related. It might also explain why it happens on my MariaDB system but not my MySQL system. Anyway, just putting out some feelers. [1] 2023-10-18 07:44:06.492400+11:00 [info] <0.30487.131> accepting STOMP connection <0.30487.131> (127.0.0.1:59120 -> 127.0.0.1:61613) 2023-10-18 07:44:06.500534+11:00 [info] <0.30487.131> closing STOMP connection <0.30487.131> (127.0.0.1:59120 -> 127.0.0.1:61613) 2023-10-18 07:44:06.510426+11:00 [info] <0.20712.130> closing STOMP connection <0.20712.130> (127.0.0.1:57508 -> 127.0.0.1:61613) 2023-10-18 07:44:08.703380+11:00 [info] <0.30518.131> accepting STOMP connection <0.30518.131> (127.0.0.1:59882 -> 127.0.0.1:61613) 2023-10-19 07:21:26.254065+11:00 [info] <0.27344.133> accepting STOMP connection <0.27344.133> (127.0.0.1:54116 -> 127.0.0.1:61613) 2023-10-19 07:21:26.259129+11:00 [info] <0.27344.133> closing STOMP connection <0.27344.133> (127.0.0.1:54116 -> 127.0.0.1:61613) 2023-10-19 07:21:26.269652+11:00 [info] <0.30518.131> closing STOMP connection <0.30518.131> (127.0.0.1:59882 -> 127.0.0.1:61613) 2023-10-19 07:21:26.660604+11:00 [info] <0.27372.133> accepting STOMP connection <0.27372.133> (127.0.0.1:46178 -> 127.0.0.1:61613) [2] Oct 18 02:08:28 awesome-host mariadbd[959]: 2023-10-18 2:08:28 6308 [Warning] Aborted connection 6308 to db: 'koha_instance' user: 'koha_instance' host: 'localhost' (Got timeout reading communication packets) Oct 18 02:15:58 awesome-host mariadbd[959]: 2023-10-18 2:15:58 6304 [Warning] Aborted connection 6304 to db: 'koha_instance' user: 'koha_instance' host: 'localhost' (Got timeout reading communication packets) Oct 18 02:16:06 awesome-host mariadbd[959]: 2023-10-18 2:16:06 6303 [Warning] Aborted connection 6303 to db: 'koha_instance' user: 'koha_instance' host: 'localhost' (Got timeout reading communication packets) Oct 18 21:10:08 awesome-host mariadbd[959]: 2023-10-18 21:10:08 6380 [Warning] Aborted connection 6380 to db: 'koha_instance' user: 'koha_instance' host: 'localhost' (Got timeout reading communication packets) Oct 19 02:21:17 awesome-host mariadbd[959]: 2023-10-19 2:21:17 6431 [Warning] Aborted connection 6431 to db: 'koha_instance' user: 'koha_instance' host: 'localhost' (Got timeout reading communication packets) Oct 19 02:24:02 awesome-host mariadbd[959]: 2023-10-19 2:24:02 6432 [Warning] Aborted connection 6432 to db: 'koha_instance' user: 'koha_instance' host: 'localhost' (Got timeout reading communication packets) David Cook Senior Software Engineer Prosentient Systems Suite 7.03 6a Glen St Milsons Point NSW 2061 Australia Office: 02 9212 0899 Online: 02 8005 0595