mmap() Error, Invalid Argument - Double slash in path?

[Aki Tuomi]

> On December 2, 2017 at 5:36 PM GE Junk <junk.ge at planetmorgan.net> wrote:
> 
> 
> I get a ton of these mmap() errors in the log. I noticed there's a 
> double slash before Maildir. Is this normal? Config error? Dovecot bug?
> 
> dovecot: imap(email at email.net): Error: mmap() failed with file 
> /shares/email/vmail/vmail1/email.net/e/m/a/email-2017.02.25.08.09.39//Maildir/dovecot.index.cache: 
> Invalid argument
> 
> I'm running dovecot version 2.2.22
> 
> Thanks
> Eric

Most likely the file system does not support mmap. Is it some remote filesystem, such as NFS? You probably can get better results by disabling mmap from dovecot.

Aki