On 2. Feb 2026, at 12.31, Christian Kivalo via dovecot <[email protected]> 
wrote:
> 
> 
> 
> On 2026-02-02 09:09, Timo Sirainen via dovecot wrote:
>> Hi,
>> On 26. Jan 2026, at 14.13, Christian Kivalo via dovecot 
>> <[email protected]> wrote:
>>> the ipad logged in again and caused ~100 panics. Logging with 
>>> log_debug=category==imap or category=sieve.
>>> I can provide the coredump if needed.
>> A core dump for this crash would be helpful, since it's not easily 
>> reproducible. Please send it to me privately [email protected] 
>> <mailto:[email protected]> using the tarball generated by 
>> dovecot-sysreport --core /path/to/core.
> 
> Hi,
> I sent you the dovecot-sysreport tarball.

Thanks. I can now reproduce. The crash happens (at least) when:
 * imapsieve action is for COPY
 * source message has no $HasAttachment or $HasNoAttachment flags
 * mail_attachment_detection_options contains add-flags (nowadays the default)

So for now the workaround would be to set mail_attachment_detection_options to 
empty value. Or trigger some doveadm command to update attachment flags to all 
existing mails (I think doveadm fetch imap.bodystructure or maybe body.1 would 
work).

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