We had the same problem. Reboot with an older kernel (2.6.18-274.17.1.el5 works for us). It is known bug of RHEL, see this bugzilla:

https://bugzilla.redhat.com/show_bug.cgi?id=681578

Regards

Javier

On Thu, 29 Mar 2012 10:15:32 +0200 (CEST), FABIO FERRARI wrote:

Good morning, we have 2 Redhat Enterprise 5.7 machines, they are a cluster with some mail services in it (postfix and dovecot 2).

The version of dovecot is dovecot-2.0.1-1_118.el5 (installed via rpm).

From last week we have this dovecot problem: suddenly dovecot doesn't accept any new connections, the dovecot.log file reports lines like these

Mar 15 12:38:54 secchia dovecot: imap: Panic: epoll_ctl(add, 5) failed: Invalid argument Mar 15 12:38:54 secchia dovecot: imap: Error: Raw backtrace:

/usr/lib64/dovecot/libdovecot.so.0 [0x36ea436de0] ->

/usr/lib64/dovecot/libdovecot.so.0 [0x36ea436e3a] -> /usr/lib64/dovecot/

libdovecot.so.0 [0x36ea4362e8] ->

/usr/lib64/dovecot/libdovecot.so.0(io_loop_handle_add+0x118)

[0x36ea441498] -> /usr/lib64/dovecot/libdovecot.so.0(io_add+0x8f)

[0x36ea440b7f] -> /usr/li

b64/dovecot/libdovecot.so.0(master_service_init_finish+0x1c6)

[0x36ea430c16] -> dovecot/imap(main+0x10a) [0x41773a] ->

/lib64/libc.so.6(__libc_start_main+0xf4) [0x36ea01d994] -> dovecot/

imap [0x408179]

Mar 15 12:38:54 secchia dovecot: master: Error: service(imap): child 14514 killed with signal 6 (core dumps disabled) Mar 15 12:38:54 secchia dovecot: master: Error: service(imap): command startup failed, throttling Mar 15 12:39:50 secchia dovecot: imap-login: Error: master(imap): Auth request timed out (received 0/12 bytes) Mar 15 12:39:51 secchia dovecot: imap-login: Error: master(imap): Auth request timed out (received 0/12 bytes)

Mar 15 12:39:51 secchia dovecot: imap-login: Error: master(imap): Auth

request timed out (received 0/12 bytes)

Mar 15 12:39:52 secchia dovecot: imap-login: Error: net_connect_unix(imap) failed: Resource temporarily unavailable Mar 15 12:39:52 secchia dovecot: imap-login: Error: net_connect_unix(imap) failed: Resource temporarily unavailable Mar 15 12:39:52 secchia dovecot: imap-login: Error: master(imap): Auth request timed out (received 0/12 bytes) Mar 15 12:39:53 secchia dovecot: imap-login: Error: net_connect_unix(imap)

failed: Resource temporarily unavailable

Mar 15 12:39:53 secchia dovecot: imap-login: Error: net_connect_unix(imap) failed: Resource temporarily unavailable Mar 15 12:39:54 secchia dovecot: imap-login: Error: net_connect_unix(imap) failed: Resource temporarily unavailable Mar 15 12:39:54 secchia dovecot: imap: Error: Login client disconnected too early Mar 15 12:39:54 secchia dovecot: imap: Error: Login client disconnected too early Mar 15 12:39:54 secchia dovecot: imap: Error: Login client disconnected too early Mar 15 12:39:54 secchia dovecot: imap: Error: Login client disconnected too early

Mar 15 12:39:55 secchia dovecot: imap: Panic: epoll_ctl(add, 5) failed:

Invalid argument

and the kern.log file reports

Mar 15 12:38:52 secchia kernel: dlm: closing connection to node 1 Mar 15 12:39:04 secchia kernel: lpfc 0000:83:00.0: 1:(0):2753 PLOGI failure DID:010400 Status:x9/x32900 Mar 15 12:39:04 secchia kernel: lpfc 0000:03:00.0: 0:(0):2753 PLOGI failure DID:010400 Status:x9/x32900

Mar 15 12:41:14 secchia kernel: lpfc 0000:03:00.0: 0:(0):2753 PLOGI

failure DID:010400 Status:x9/x32900

Mar 15 12:41:15 secchia kernel: lpfc 0000:83:00.0: 1:(0):2753 PLOGI failure DID:010400 Status:x9/x32900 Mar 15 12:42:11 secchia kernel: dlm: got connection from 1

can you help us?

thanks in advance

Fabio Ferrari