[Dovecot] lmtp: Error: mmap failed with file ... dovecot.index.cache: Cannot allocate memory

[David Jonas]

Hello,

I have a mailbox with an ungodly number of small messages in it. When
new messages are delivered lmtp kicks up an error like the one below. I
tried raising the vsz_limit for lmtp but that didn't see to help. Any
ideas (besides deleting 400k messages)? Thanks!

dovecot: lmtp(6068, u...@example.com): Error: mmap() failed with file
/home/vmail/domains/example.com/user/Maildir/dovecot.index.cache: Cannot
allocate memory

# ls -lah dovecot.index.cache
-rw------- 1 vmail vmail 128M Jul 29 20:16 dovecot.index.cache

# doveadm mailbox status -u u...@example.com all inbox
INBOX messages=434118 recent=59848 uidnext=434119 uidvalidity=1293568548
unseen=432625 highestmodseq=14023 vsize=1329486283
guid=f8d48232244a1a4dfe2e0000cb0ad7e0

# doveconf -n
...
default_vsz_limit = 256 M
service lmtp {
  inet_listener lmtp {
    port = 24
  }
  vsz_limit = 256 M
}

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