[Dovecot] Out of memory after upgrading to dovecot 2.0.21

Hello,

I've upgraded our servers and now dovecot seems to be running out of memory when accessing my own mailbox (and only mine, which is in a way pretty fortunate):

dovecot: imap(abelard-a): Error: mmap() failed with file /vmail/a/b/abelard-a/dovecot.index.cache: Cannot allocate memory

imap(abelard-a): Fatal: pool_system_realloc(131072): Out of memory

/vmail/a/b/abelard-a/dovecot.index.cache is 224MB big and my mailbox is 72% full of 8GB.

any idea of what is happening?

Thanks in advance,

Arnaud

-- Arnaud Abélard jabber: arnaud.abelard@univ-nantes.fr / twitter: ArnY Administrateur Système DSI Université de Nantes