Corrupted sizes in cache once again

[Stuart Henderson]

On 2023-02-02, Tim Evers <te-ml-ext at artfiles.de> wrote:
>
> Am 02.02.23 um 16:23 schrieb Aki Tuomi:
>> For bug reports, we do ask that you try to reproduce it with 2.3.20 (current latest), you can get packages from https://repo.dovecot.org/ and would be nice if you can provide steps to reproduce this issue.
>>
>> Also please see https://www.dovecot.org/bugreport-mail/ if you have not yet.
>>
>> Aki
>
> This is not a bug report (yet) - I am asking for ideas to narrow down 
> the issue myself. I would not expect something this obvious and 
> prevalent being a bug in a 10+ years old subsystem (zlib).

Some of the errors seen that were fixed in the period that I mentioned
looked *exactly* like this.