dovecot lmtp thinks that "disk quota exceeded" is "internal error"

[Sami Ketola]

> On 13 Nov 2018, at 21.06, Arkadiusz Miśkiewicz <arekm at maven.pl> wrote:
> 
> On 13/11/2018 15:54, Arkadiusz Miśkiewicz wrote:
>> 
>> 2.2.36 (not migrated to 2.3 yet) reports such problem:
>> 
>>> Nov 13 15:50:58 mbox dovecot: lmtp(xxx): session=<ACYRCtLk6ltiEQAALZVUYQ>, Error: open(/var/mail/xxx/mailboxes.lock1bf6ad16b7b8b703) failed: Disk quota exceeded
>>> Nov 13 15:50:58 mbox dovecot: lmtp(xxx): session=<ACYRCtLk6ltiEQAALZVUYQ>, Error: Couldn't create mailbox list lock /var/mail/xxx/mailboxes.lock: file_create_locked(/var/mail/xxx/mailboxes.lock) failed: safe_mkstemp(/var
>>> /mail/xxx/mailboxes.lock) failed: Disk quota exceeded
>>> Nov 13 15:50:58 mbox dovecot: lmtp(xxx): session=<ACYRCtLk6ltiEQAALZVUYQ>, msgid=<db663455902e1b3faa53f344dc353870 at xxx>: save failed to open mailbox INBOX.Spam: Internal error occurred. Refer to server log for more informat
>>> ion. [2018-11-13 15:50:58]
>> 
>> Looks a bug to me since disk exceeded is not a internal error. Shouldn't
>> lmtp return over quota info instead of error?
>> 
> 
> Just to confirm - dovecot 2.3.3 - the same behaviour, internal error

Dovecot can't create the lock file and it's treated as internal error. Why do you think that it should not be treated as such?

Sami