vsz_limit is 18,447 PB

[Dan Langille]

I encountered this error on FreeBSD 9.3 with dovecot2-2.2.13_3

Short version; vsz_limit is 18,447 PB and it ran out of RAM.  Suggestions for change?

Sep  6 03:39:32 mailjail dovecot: imap(dan): Panic: file imap-fetch.c: line 556 (imap_fetch_more): assertion failed: (ctx->client->output_cmd_lock == NULL || ctx->client->output_cmd_lock == cmd)
Sep  6 03:39:32 mailjail dovecot: imap(dan): Fatal: master: service(imap): child 71153 killed with signal 6 (core not dumped - set service imap { drop_priv_before_exec=yes })
Sep  6 03:59:41 mailjail dovecot: imap(dan): Fatal: pool_system_realloc(2097152): Out of memory
Sep  6 03:59:41 mailjail dovecot: imap(dan): Fatal: master: service(imap): child 67732 returned error 83 (Out of memory (service imap { vsz_limit=256 MB }, you may need to increase it) - set CORE_OUTOFMEM=1 environment to get core dump)

Background: I’m in the only user on this system, but this server is accessed by my phone, my laptop, my tablet, and perhaps a web interface.

Here are the non-default values:

$ doveconf -n
# 2.2.13: /usr/local/etc/dovecot/dovecot.conf
# OS: FreeBSD 9.3-RELEASE amd64  
auth_mechanisms = plain login
first_valid_gid = 1001
first_valid_uid = 1001
mail_location = maildir:~/Maildir
mail_max_userip_connections = 80
mail_privileged_group = mail
passdb {
 args = scheme=SHA512-CRYPT /var/db/dovecot.users
 driver = passwd-file
}
protocols = imap
service imap-login {
 inet_listener imap {
   address = 10.0.0.1
 }
 inet_listener imaps {
   port = 0
 }
}
ssl = required
ssl_ca = </usr/local/etc/ssl/ca.pem
ssl_cert = </usr/local/etc/ssl/server.pem
ssl_key = </usr/local/etc/ssl/mailjail.example.org.nopassword.key
userdb {
 args = /var/db/dovecot.users
 driver = passwd-file
}
verbose_proctitle = yes
verbose_ssl = yes


But there are some interesting values when I look at the output of doveconf.  Specifically, vsz_limit is 18,447 PB… yeah, that’s pretty big.

service imap-login {
 chroot = login
 client_limit = 0
 drop_priv_before_exec = no
 executable = imap-login
 extra_groups = 
 group = 
 idle_kill = 0
 inet_listener imap {
   address = 10.0.0.1
   port = 143
   reuse_port = no
   ssl = no
 }
 inet_listener imaps {
   address = 
   port = 0
   reuse_port = no
   ssl = yes
 }
 privileged_group = 
 process_limit = 0
 process_min_avail = 0
 protocol = imap
 service_count = 1
 type = login
 user = $default_login_user
 vsz_limit = 18446744073709551615 B
}

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