Re: [Dovecot] maildir_file_do(/var/admhome/user/Maildir) racing
On 14.5.2007, at 17.54, Ralf Hildebrandt wrote: One, just one (!) of our users gets: May 14 16:47:17 postamt dovecot: imap-login: Login: user=username, method=PLAIN, rip=141.42.x.y, lip=ip.of.the.server May 14 16:47:17 postamt dovecot: imap-login: Login: user=username, method=PLAIN, rip=141.42.x.y, lip=ip.of.the.server May 14 16:47:17 postamt dovecot: IMAP(username): maildir_file_do(/ var/admhome/username/Maildir) racing This happens at every login? I thought I'd never see this racing error. It means that Dovecot tried to some operation to a maildir file. But the operation failed, because the file was just renamed (eg. flag changed). So it located the file again, and found it. Then it tried the operation again, but it failed the same way. This was tried 10 times until it gave this racing error. I think it's a bit unlikely that the filename was changing that fast. So there's probably a bug somewhere.. Could get strace output from those two logins and send them to me? You can do this with eg.: mail_executable = /usr/local/bin/run-imap.sh run-imap.sh: #!/bin/sh exec strace -tt -s 1000 -o /tmp/imap.$USER.`time +%u`.$$.log /usr/ local/libexec/dovecot/imap PGP.sig Description: This is a digitally signed message part
Re: [Dovecot] maildir_file_do(/var/admhome/user/Maildir) racing
* Timo Sirainen [EMAIL PROTECTED]: This happens at every login? I thought I'd never see this racing error. I found the reason: The User had a symlink in his $HOME/Maildir/cur, which pointed to a NON-existing file :( Courier-IMAP ignored that, dovecot bailed out. I removed the bogus symlink and all is well now. It means that Dovecot tried to some operation to a maildir file. Yep. -- Ralf Hildebrandt (i.A. des IT-Zentrums) [EMAIL PROTECTED] Charite - Universitätsmedizin BerlinTel. +49 (0)30-450 570-155 Gemeinsame Einrichtung von FU- und HU-BerlinFax. +49 (0)30-450 570-962 IT-Zentrum Standort CBFsend no mail to [EMAIL PROTECTED]
Re: [Dovecot] maildir_file_do(/var/admhome/user/Maildir) racing
On Tue, 2007-05-15 at 11:48 +0200, Ralf Hildebrandt wrote: * Timo Sirainen [EMAIL PROTECTED]: This happens at every login? I thought I'd never see this racing error. I found the reason: The User had a symlink in his $HOME/Maildir/cur, which pointed to a NON-existing file :( I've changed Dovecot's behavior now also: x fetch * body imap(tss): Error: Maildir: Symlink destination doesn't exist: /home/tss/Maildir/cur/dgdgd * 40 FETCH (BODY (text plain NIL NIL NIL 7bit 0 0 NIL NIL NIL)) x OK Fetch completed. So it logs an error but still goes ahead without disconnecting the client. signature.asc Description: This is a digitally signed message part
Re: [Dovecot] maildir_file_do(/var/admhome/user/Maildir) racing
* Timo Sirainen [EMAIL PROTECTED]: I've changed Dovecot's behavior now also: x fetch * body imap(tss): Error: Maildir: Symlink destination doesn't exist: /home/tss/Maildir/cur/dgdgd * 40 FETCH (BODY (text plain NIL NIL NIL 7bit 0 0 NIL NIL NIL)) x OK Fetch completed. So it logs an error but still goes ahead without disconnecting the client. Great! Thank you. Success story: We were using courier-imap with 9000 User accounts here at Charite and yesterday I switched to dovecot for imap, imaps and pop3s. The load dropped from 50-60 to 2 (!) during noon. Excellent! -- Ralf Hildebrandt (i.A. des IT-Zentrums) [EMAIL PROTECTED] Charite - Universitätsmedizin BerlinTel. +49 (0)30-450 570-155 Gemeinsame Einrichtung von FU- und HU-BerlinFax. +49 (0)30-450 570-962 IT-Zentrum Standort CBFsend no mail to [EMAIL PROTECTED]
Re: [Dovecot] maildir_file_do(/var/admhome/user/Maildir) racing
Hello Ralf, Ralf Hildebrandt [EMAIL PROTECTED], [20070515 - 12:37:36] * Timo Sirainen [EMAIL PROTECTED]: I've changed Dovecot's behavior now also: x fetch * body imap(tss): Error: Maildir: Symlink destination doesn't exist: /home/tss/Maildir/cur/dgdgd * 40 FETCH (BODY (text plain NIL NIL NIL 7bit 0 0 NIL NIL NIL)) x OK Fetch completed. So it logs an error but still goes ahead without disconnecting the client. Great! Thank you. Success story: We were using courier-imap with 9000 User accounts here at Charite and yesterday I switched to dovecot for imap, imaps and pop3s. The load dropped from 50-60 to 2 (!) during noon. Excellent! Are you willing to elaborate a bit about your setup, hardware, config, etc? This would be good to know what mailsystem is behind that values :-) Thanks Stephan
Re: [Dovecot] maildir_file_do(/var/admhome/user/Maildir) racing
* Stephan Holl [EMAIL PROTECTED]: Are you willing to elaborate a bit about your setup, hardware, config, etc? This would be good to know what mailsystem is behind that values :-) Debian/testing, hand-rolled 2.6.21.1-NOHZ-SMP kernel The users are stored in /etc/passwd (for historical reasons (don't ask)) Dual Xeon 2.8GHz with 3GB RAM 1,8TB mailstore (ext3, external SCSI RAID) -- Ralf Hildebrandt (i.A. des IT-Zentrums) [EMAIL PROTECTED] Charite - Universitätsmedizin BerlinTel. +49 (0)30-450 570-155 Gemeinsame Einrichtung von FU- und HU-BerlinFax. +49 (0)30-450 570-962 IT-Zentrum Standort CBFsend no mail to [EMAIL PROTECTED]
