On 21.12.2011, at 18.38, hydra wrote: > I suspect, that dovecot v2.0.16 under Linux (tested on Gentoo 3.0.4 > Hardened, Gentoo 3.0.6, Gentoo 3.1.4) causes 100% cpu utilization when > index.cache is broken and doveadm is lanched. Dovecot uses LDAP as the > userdb and provides IMAP and LDA. Because each user has a quota, the > doveadm's expunge functionality is used to get rid of old trashed mail. > > The mail log: > Dec 12 07:38:59 www dovecot: imap(user): Error: Corrupted index cache file > /var/data/mail/domain.tld/user/mail/dovecot.index.cache: invalid record size
OK.. > Mail is stored on ext4 and flush will use all of the CPU capacity like this: > load average: 4.00, 4.01, 4.05 > > ps: > root 26401 98.2 0.0 0 0 ? R Dec20 1369:49 > [flush-253:1] That's a kernel process.. > I suspect, that this is something to do with Dovecot, because after > deleting the dovecot.index.cache file, everything went back to normal. When > this happens, I cannot unmount the drive nor a system reboot works. That's a kernel bug.. I think you're thinking it the wrong way: Dovecot isn't causing your system to break. Your system is causing Dovecot to break. Faulty hardware or faulty kernel.
