Active threads waiting on IPC / messagequeuesend

From: Benjamin Leis <benleis1(at)gmail(dot)com>
To: pgsql-admin(at)lists(dot)postgresql(dot)org
Subject: Active threads waiting on IPC / messagequeuesend
Date: 2023-11-10 20:04:31
Message-ID: CADP9qHvBGvO_L+G-rG6McAmAdFzLa2Z-scbYi-dOWpduWHbuLw@mail.gmail.com
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I'm looking at a pg_stat_activity dump where there are a group of active
threads stuck for a long time in MessageQueueSend

7:52.394089+00 | IPC | MessageQueueSend | active |
| 27406510 | -5892847938856697008 | SELECT ....

Does this mean they are blocked on clients reading data or does it
represent something blocking on the server side?
Thanks
Ben

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