Cyrus cannot restart

A strange disaster after years of flawless Cyrus work.

After replacing an expiring certificate, I had to reload Cyrus IMAP 
3.12.1 on FreeBSD 14.3-RELEASE-p7. Unfortunately, this time Cyrus has 
shut down and refuses to start without a clear reason:

> *couldn't dup fd 0: Bad file descriptor*

The last lines from maillog:

> Dec 22 18:30:00 … cyrus/imap[51173]: graceful shutdown
> Dec 22 18:30:00 … cyrus/imap[6908]: graceful shutdown
> Dec 22 18:30:00 … cyrus/imap[40383]: graceful shutdown
> Dec 22 18:30:00 … cyrus/notify[4142]: graceful shutdown
> Dec 22 18:30:00 … cyrus/imap[42239]: graceful shutdown
> Dec 22 18:30:00 … cyrus/imap[40389]: graceful shutdown
> Dec 22 18:30:00 … cyrus/imap[40141]: graceful shutdown
> Dec 22 18:30:00 … cyrus/idled[4144]: graceful shutdown
> Dec 22 18:30:00 … cyrus/imap[40407]: graceful shutdown
> Dec 22 18:30:00 … cyrus/master[4127]: All children have exited, 
> closing down
> Dec 22 18:30:01 … master[67928]: couldn't dup fd 0: Bad file descriptor
> Dec 22 18:30:01 … master[67928]: exiting
> Dec 22 18:30:01 … username[67932]: /usr/local/etc/rc.d/imapd: WARNING: 
> failed to
> start cyrus_imapd
> Dec 22 18:30:43 … master[68279]: couldn't dup fd 0: Bad file descriptor
> Dec 22 18:30:43 … master[68279]: exiting
> Dec 22 18:30:43 … usernam[68283]: /usr/local/etc/rc.d/imapd: WARNING: 
> failed to
> start cyrus_imapd

debug.log no errors at all, the last line is:

> Dec 22 18:30:00 … cyrus/master[4127]: ready for work

What “couldn't dup fd 0: Bad file descriptor” mean, where to look for 
the snag, how to fix it?

Vladas

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Cyrus: Info
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