[Dovecot] Segfault problem when using TWO dovecot servers!

[Adam M. Dunn]

Forgive me if this gets submitted twice.  I had issues signing up for the
listserv but I think I'm strait now.



Hi all,
  I just started working with Dovecot and I'd like to use it for my
organization, but I've run into a little problem.  So far I love it and it
does what I need.  One thing we need is to be able to write to multiple
mailbox formats on a per user basis (mbox or Maildir), and it does just
that.  I want users to be able to choose their format, and I can let it
autodetect for me.  The way I do that is I have Maildrop filters check for
the presence of a ~Maildir, and if it finds that it writes to it, 
otherwise it writes to ~mbox.  Dovecot is the only IMAP server I've found
to read either or without hard coding one or the other in the config file.


The problem:
We also want failover.  Mail/home directories are NFS mounted.  I was
planning to setup two dovecot servers, and noticed that whenever one
server writes its temp files to the mail directory, if another server
tries to read it you get a segfault and the child process fails and dies.
So it basically looks like only one server can own the files, and it won't
share.  I considered trying to set the INDEX option on the mail boxes to
write local indexes, but if I try to specify something like:
default_mail_env = INDEX=/var/indexes/%d/%n, it doesn't work.  Sure I can
make it work by putting in a mailbox format before the INDEX, but then I
can't use the autodetect which I need.

Here's the syslog error:

kernel: imap[13689]: segfault at 00007fffffe38000 rip 00002aaaaad3823f rsp 00007fffffe351f0 error 4


Any solutions?  I really need this to work badly, or we may have to
rethink our entire mail strategy.  I'm also using the latest version
1.0beta3.  

I considered namespaces, but correct me if I'm wrong, you can't setup
two namespaces and have it pick the first mailbox format available like
the autodetect feature does.  I tried seting up namespaces for both mbox
and Maildir, but it just creates both.



Please help someone.  I need a solution to present to my boss, even if
that means we have to run one server until the bug is fixed in the next
version.



Thanks,
Adam