failed: Cached message size smaller than expected

[Michael Grant]

On Fri, Apr 02, 2021 at 04:45:36PM -0400, Michael Grant wrote:
> Every few days, my mailbox seizes up.  No mail come in to my imap clients.
> 
> I'm getting these errors over and over with my mailbox:
> 
>   Error: Mailbox INBOX: Deleting corrupted cache record uid=371208: UID 371208: Broken physical size in mailbox INBOX: read(/var/mail/mgrant) failed: Cached message size smaller than expected (17212 < 17222, box=INBOX, UID=371208)
>   Error: Mailbox INBOX: UID=371208: read(/var/mail/mgrant) failed: Cached message size smaller than expected (17212 < 17222, box=INBOX, UID=371208) (FETCH BODY[])
>   Error: Mailbox INBOX: Deleting corrupted cache record uid=371203: UID 371203: Broken physical size in mailbox INBOX: read(/var/mail/mgrant) failed: Cached message size smaller than expected (3904 < 3914, box=INBOX, UID=371203)
>   Error: Mailbox INBOX: UID=371203: read(/var/mail/mgrant) failed: Cached message size smaller than expected (3904 < 3914, box=INBOX, UID=371203) (FETCH BODY[])
> 
> My inbox is an mbox file.  I'm running dovecot installed on Debian
> Bullseye, the dovecot packages are all: 1:2.3.13+dfsg1-1
> 
> I am running sendmail and using procmail for local delivery.
> 
> I suspect, but am not certain, that this may be some locking issue
> between procmail and dovecot but I have never been able to prove
> that. The final procmail rule which appends messages to my mailbox
> looks like this, the trailing ':' causes procmail to use a lockfile:
> 
> :0:
> /var/mail/mgrant
> 
> The locking config lines in 10-mail.conf are commented, but I have
> also tried uncommenting them, did not help:
> 
> #mbox_read_locks = fcntl
> #mbox_write_locks = fcntl dotlock
> 
> Though sometimes it seems to fix itself after a few hours, the only
> way I have found to fix this quickly is to manually remove the cache
> files and restart dovecot:
> 
> rm ~/mail/.imap/INBOX/*
> systemctl restart dovecot
> 
> I am not even sure this is a locking issue.  Something definitely gets
> corrupted though. I do have several IMAP clients hitting the same
> mailbox (phone, laptop, desktop).  On the phone, I run K9 and also the
> gmail client which talks imap.  Also using thunderbird, outlook, and
> w10 mail, though typically not all at the same time.  You could
> definitely say I am stress testing this setup a bit!
> 
> Any ideas on how to resolve this?

I still see this corruption every day or so.  Anyone have any ideas how to debug this or resolve it?

Michael Grant


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