[Dovecot] Dovecot 1.2.9 Crash, NFS

[Timo Sirainen]

On 21.3.2012, at 17.45, Müller Lukas wrote:

> Mar  6 08:26:31 mail02 dovecot: IMAP(user at example.com): fdatasync(/data/vmail/example.com/user/dovecot-uidlist) failed: Input/output error
> Mar  6 08:42:29 mail02 dovecot: IMAP(user at example.com): Maildir /data/vmail/example.com/user: Expunged message reappeared, giving a new UID (old uid=1522, file=1326961561.V15I4d8562M567017.mail02:2,Sad)
> Mar  6 08:42:29 mail02 dovecot: IMAP(user at example.com): Maildir /data/vmail/example.com/user: Expunged message reappeared, giving a new UID (old uid=1523, file=1326705103.V15I90105M613353.mail01:2,Sad)
> Mar  6 08:42:29 mail02 dovecot: IMAP(user at example.com): /data/vmail/example.com/user/dovecot-uidlist: Duplicate file entry at line 4: 1326961561.V15I4d8562M567017.mail02:2,Sad (uid 1522 -> 1598)
..

> My suspicion/speculation what happens is the following:
> Multiple users are accessing the Mailbox from their offices (all on the same server), one (or more) uses the Webmail or accesses the Mailbox from a different IP.
> Somehow this leads to problems with Locks on NFS, which leads to the crash.

Yes, most likely this is what's happening. Although your errors are more severe than what normally happens. I guess your NFS server is also partially to blame (microsecond resolution timestamps are at least helpful).

> I have no idea how to solve this problem and any help is greatly appreciated.


The only way to fully fix this is: http://wiki2.dovecot.org/Director