Note to all: If you are running Dovecot on a system where any of the mailboxes are nfs v4 mounted from a RHEL (or derivative) server DO NOT upgrade that server to an unpatched 2.6.18-164 kernel, it is very broken at this time. Not only will Dovecot fail but you're likely to have a myriad of other problems.

https://bugzilla.redhat.com/show_bug.cgi?id=523797 https://bugzilla.redhat.com/show_bug.cgi?id=524520

On Mon, 2009-10-05 at 10:30 -0400, vwc72283@voicenet.com wrote:

...

So, it is reproducible. Now, if you take O_EXCL out it works even for the user: .. Why I suddenly get the behavior I don't know. Clearly its not deliver, but deliver tries to do something that behaves badly on this system.

I've no idea. Never heard of O_EXCL failing in that way. You could always just remove the O_EXCL uses from Dovecot sources, Dovecot doesn't rely on them.