Re: [Dovecot] Test environment question

[Timo Sirainen]

The code has some checks that if posix_fallocate() fails with a specific errno it stops trying to use it. Maybe it hits that condition at some point. Or maybe the code just isn't called for some reason, I don't really know..

On Oct 9, 2008, at 6:45 PM, Stewart Dean wrote:

I have a call open to IBM with their Compiler group on this to see if this can't be fixed right. A side question: how come is it that this happens when the session starts up and reoccurs periodically for the first day or so...and then not again unless and until those imap process sessions are closed out

Timo Sirainen wrote:

On Fri, 2008-10-03 at 14:33 -0400, Stewart Dean wrote:

I am seeing posix_fallocate and file_set_size errmsgs in the mail syslog, but

see a pattern:


(9AM, 10/1/98) until 11AM, 10/2...and then ceased
The every ten minute message sets looked like this:

failed: Resource temporarily unavailable

1) They only happen with the /var/spool/mail inbox NOT with any of the /home folders and appear to be happening every 10 minutes from the time I started DC > Oct 1 22:30:31 egg mail:err|error dovecot: IMAP(sdean): posix_fallocate()

The main problem here is that posix_fallocate() is broken in your AIX

Dovecot detect this and silently fallback to not using it, but
apparently it can fail in more ways. I thought about adding another
check for EAGAIN, but perhaps posix_fallocate() just returns the

configure instead:

http://hg.dovecot.org/dovecot-1.1/rev/12565ef10d1c


if it's already been fixed in AIX. This looks related:
http://www-01.ibm.com/support/docview.wss?uid=isg1IY77112

(v1.0 doesn't even try to use it). My previous patch attempted to make previous errno so it can't be checked that way. So I moved the check to Alternatively you could just remove HAVE_POSIX_FALLOCATE from config.h after running configure. Or yet another way would be to try to find out

3) However, then there was the following:

on my test server:

a) If I used webmail, which accessed the production server and got the indices on my test server out of sync, I got this error message from in the mail syslog

Oct 3 12:20:23 egg mail:err|error dovecot: IMAP(sdean): mbox sync: UID inserted in the middle of mailbox /var/spool/mail/sdean (648818 > 648046, seq=1153, idx_

msgs=1187)

for some reason. This'll fix it:
http://hg.dovecot.org/dovecot-1.1/rev/a5bf7e12f3cc

v1.1 also has a bug that can cause this, although normally it should be visible only when index files aren't being used, or they're out of sync

Oct 3 12:44:58 egg mail:info dovecot: imap-login: Maximum number of connections from user+IP exceeded: user=<sdean>, method=PLAIN, rip=10.20.10.169, lip=192.24

6.229.31

Turns out I had 10+ sessions, one back from yesterday, so I killed them all and could get mail, but...about six minutes later, I had the two posix_fallocate and file_set_size errmsgs again after not having any for a day. So something about

new connections maybe causes this?

Any ideas why:

  my production DC V1.0 server

a) I am having leftover IMAP sessions on my test server? This doesn't happen on

client(s) really just left that many connections. So the choices are:

a) Increase mail_max_userip_connections setting.

b) Figure out where the sessions are from and see if you can do
something about them on the client side. In Thunderbird there's a
setting which specifies how many connections it can use.

Are you sure? Perhaps you just didn't notice them since v1.0 didn't have any limits to how many were allowed? I think it's more likely that the

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