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
