> On 18 Aug 2026, at 19:44, Álvaro Herrera <[email protected]> wrote: > > On 2026-Aug-18, Tom Lane wrote: > >> # +ERROR: could not register background process >> # +HINT: You may need to increase "max_worker_processes". >> >> test_shm_mq itself hasn't changed meaningfully in ages, >> so it seems like some recent change somewhere else has increased >> the probability of not being able to get a worker process. >> Maybe autovacuum is eating too many workers? Any thoughts? > > Hm, autovacuum does not use workers from the bgworker pool AFAIK. > Repack concurrently does. However, I don't think we use repack > concurrently anywhere in the standard tests; we only run it in the > test_decoding and injection_point tests, which have separate instances.
Online checksums also use bgworkers but it too should not be running here, and looking at it I didn't see evidence of it interfering. I'll have another look in the morning with fresh eyes. -- Daniel Gustafsson
