[Dovecot] Re: Dovecot hangs randomly

[Jacob Elder]

Our logs are filled with messages like this:

Jul 30 09:53:57 chatham dovecot-auth: Login process has too old  
(124s) requests, killing it.
Jul 30 09:56:17 chatham dovecot-auth: Login process has too old  
(124s) requests, killing it.
Jul 30 09:57:17 chatham dovecot-auth: Login process has too old  
(124s) requests, killing it.
Jul 30 09:58:17 chatham dovecot-auth: Login process has too old  
(124s) requests, killing it.
Jul 30 09:58:52 chatham dovecot-auth: Login process has too old  
(122s) requests, killing it.
Jul 30 10:01:51 chatham dovecot: login: received another "not  
listening" notification (if you can't login at all, see src/lib/ 
fdpass.c)
Jul 30 10:02:17 chatham dovecot-auth: Login process has too old  
(124s) requests, killing it.
Jul 30 10:03:52 chatham dovecot-auth: Login process has too old  
(122s) requests, killing it.
Jul 30 10:07:07 chatham dovecot-auth: Login process has too old  
(124s) requests, killing it.
Jul 30 10:07:07 chatham dovecot-auth: Login process has too old  
(124s) requests, killing it.
Jul 30 10:07:07 chatham dovecot-auth: Login process has too old  
(125s) requests, killing it.
Jul 30 10:07:17 chatham dovecot-auth: Login process has too old  
(123s) requests, killing it.
Jul 30 10:07:52 chatham dovecot-auth: Login process has too old  
(123s) requests, killing it.
Jul 30 10:09:07 chatham dovecot: Killed with signal 15
Jul 30 10:09:07 chatham dovecot-auth: I/O leak: 0x8054940 (13)
Jul 30 10:09:07 chatham dovecot-auth: I/O leak: 0x8054940 (15)
Jul 30 10:09:07 chatham dovecot-auth: I/O leak: 0x8054940 (16)
Jul 30 10:09:07 chatham dovecot-auth: I/O leak: 0x8054940 (18)
Jul 30 10:09:07 chatham dovecot-auth: I/O leak: 0x8054940 (24)
Jul 30 10:09:07 chatham dovecot-auth: I/O leak: 0x8054940 (7)
Jul 30 10:09:07 chatham dovecot-auth: I/O leak: 0x8054940 (10)
Jul 30 10:09:07 chatham dovecot-auth: I/O leak: 0x8054940 (11)
Jul 30 10:09:07 chatham dovecot-auth: I/O leak: 0x8054940 (17)
Jul 30 10:09:07 chatham dovecot-auth: I/O leak: 0x8054940 (27)
Jul 30 10:09:07 chatham dovecot-auth: I/O leak: 0x8054940 (20)
Jul 30 10:09:07 chatham dovecot-auth: I/O leak: 0x8054940 (22)
Jul 30 10:09:07 chatham dovecot-auth: I/O leak: 0x8054940 (23)
Jul 30 10:09:07 chatham dovecot-auth: I/O leak: 0x8054940 (29)
Jul 30 10:09:07 chatham dovecot-auth: I/O leak: 0x8054940 (30)

Can anyone decipher this?

--
Jacob Elder



On Jul 28, 2005, at 12:19 PM, Jacob Elder wrote:

> I have been run into a weird problem with dovecot. We have 4  
> identical servers running dovecot, serving both IMAP and POP3  
> clients. Every few hours, clients start timing out after the PASS  
> command. Here is what the process tree looks like at that time:
>
>  6718 ?        Ss     0:00 /usr/sbin/dovecot
> 6719 ?        S      0:00  \_ dovecot-auth
> 6881 ?        S      0:00  |   \_ dovecot-auth
> 6883 ?        S      0:00  |   \_ dovecot-auth
> 6890 ?        S      0:00  |   \_ dovecot-auth
> 6928 ?        S      0:00  |   \_ dovecot-auth
> 6929 ?        S      0:00  |   \_ dovecot-auth
> 6934 ?        S      0:00  |   \_ dovecot-auth
> 6936 ?        S      0:00  |   \_ dovecot-auth
> 6939 ?        S      0:00  |   \_ dovecot-auth
> 6720 ?        S      0:00  \_ imap-login
> 6721 ?        S      0:00  \_ imap-login
> 6722 ?        S      0:00  \_ imap-login
> 6782 ?        S      0:00  \_ pop3-login
> 6808 ?        S      0:00  \_ pop3-login
> 6884 ?        S      0:00  \_ pop3-login
> 6885 ?        S      0:00  \_ pop3-login
> 6886 ?        S      0:00  \_ pop3-login
> 6887 ?        S      0:00  \_ pop3-login
> 6888 ?        S      0:00  \_ pop3-login
> 6889 ?        S      0:00  \_ pop3-login
> 6931 ?        S      0:00  \_ pop3-login
> 6937 ?        S      0:00  \_ pop3-login
> 6940 ?        S      0:00  \_ pop3-login
>
> After running invoke-rc.d dovecot stop, the process tree looks like  
> this:
>
> 6782 ?        S      0:00 pop3-login
> 6808 ?        S      0:00 pop3-login
> 6881 ?        S      0:00 dovecot-auth
> 6883 ?        S      0:00 dovecot-auth
> 6884 ?        S      0:00 pop3-login
> 6885 ?        S      0:00 pop3-login
> 6886 ?        S      0:00 pop3-login
> 6887 ?        S      0:00 pop3-login
> 6889 ?        S      0:00 pop3-login
> 6890 ?        S      0:00 dovecot-auth
> 6928 ?        S      0:00 dovecot-auth
> 6929 ?        S      0:00 dovecot-auth
> 6931 ?        S      0:00 pop3-login
> 6934 ?        S      0:00 dovecot-auth
> 6936 ?        S      0:00 dovecot-auth
> 6939 ?        S      0:00 dovecot-auth
>
> If I run "killall -9 dovecot-auth pop3-login; invoke-rc.d dovecot  
> start", service resumes for a few hours. This happens both on 2.6.8  
> and 2.4.27. This is Debian testing, 512 MB RAM, about 20 users per  
> server. We use libnss-ldap and libpam-ldap for all users other than  
> root. Samba, SSH, saslauthd (for Postfix), login, etc all work as  
> expected. There is a 5th server that is identical to the other 4  
> except is NOT using libpam-ldap, and dovecot does not hang on this  
> machine. Any ideas?
>
> --
> Jacob Elder
>
>
>
>