> On 12/12/2024 17:00 EET Ewald Dieterich via dovecot <dovecot@dovecot.org>
> wrote:
>
>
> I'm running Dovecot 2.3.21 with the mdbox mailbox format. I lose mails
> (with an asterisk, see below) when I'm doing the following in 2 IMAP
> sessions:
>
> Session 1: Create a folder, save a mail and select it:
>
> . create folder
> . append folder {1}
> . select folder
> * 1 EXISTS
> * OK [UIDVALIDITY 1734013510] UIDs valid
>
> Session 2: Delete the folder, create it again, save a mail in it, check
> the number of messages and the uidvalidity:.
>
> . delete folder
> . create folder
> . append folder {1}
> . status folder (messages uidvalidity)
> * STATUS folder (MESSAGES 1 UIDVALIDITY 1734013511)
>
> Everything is as expected until here, the uidvalidity was increased by
> 1, which makes sense.
>
> Session 1: Just do a noop
>
> . noop
> * BYE IMAP session state is inconsistent, please relogin.
>
> Dovecot notices that something is wrong and closes the connection. This
> error is logged:
>
> Error: Mailbox folder: Corrupted transaction log file
> /var/spool/dovecot/user/mailboxes/folder/dbox-Mails/dovecot.index.log
> seq 2: indexid changed: 1734011270 -> 1734011403 (sync_offset=0)
>
> Session 2: Check the folder again:
>
> . status folder (messages uidvalidity)
> * STATUS folder (MESSAGES 0 UIDVALIDITY 1734013512)
>
> The mail is gone, uidvalidity was again increased by 1, so this is a new
> folder.
>
> I think the problem is that the folder's transaction log is deleted in
> session 1 in mail_transaction_log_file_open() when Dovecot notices
> discrepancies in what it expects:
>
> if (ret == 0) {
> /* corrupted */
> if (index->readonly) {
> /* don't delete */
> } else {
> i_unlink_if_exists(file->filepath);
> }
> *reason_r = "File is corrupted";
> return 0;
> }
>
> This basically recreates the folder, so now it's empty.
>
> Here's the asterisk: I know that technically the mail isn't lost because
> it's still in the storage file and can be recovered. But it's still
> ugly. And when I copy a mail from another folder instead of appending
> it, I can't recover it for the folder because the information that the
> mail was copied is definitely lost.
>
> Can this be fixed in Dovecot?
Hi!
Thank you for your bug report, we'll take a look. Does the folder recover if
you run doveadm force-resync?
Aki
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