On 8/20/25 14:49, Genes Lists via dovecot wrote:
Is it possible the errno came from elsewhere somehow?

The error is reproducible, and only happens with this account (in ~6 weeks of log files). For this account, it happens from different client machines, and MUAs.

Does this have auth_debug = yes?

Yes, hence the verbosity.

Any chance you can run a test with current release 2.4.1 or git head to
see if it exhibits similar issues?

It's a production machine. And since the recent comments here give me the impression that 2.4 should really have been called 3.0 Alpha, I think I'll pass.

Not a dovecot dev, but if were me and debug logs did not reveal enough,
  I'd add some debugging print statements to src/lib/ipwd.c (thats where
the 2.4.x call to getpwnam_r() is) to try figure out what is actually
happening. I did not look to see how similar the old 2.3.x code is to
2.4.

Thanks, I'll have a look at the code.

Cheerio,
Hauke

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