[Dovecot] POP3: Panic: Trying to allocate 0 bytes

14 Apr 2014


      Hi,
today I upgraded one of our dovecot servers from 2.117 to version 2.2.12 under Debian Squeeze.
After the upgrade I got many of the following errors for pop3 users.
My logfile shows:
...
Apr 14 09:28:05 mailstore dovecot: pop3(user@domain.net pid:39688 session:): Panic: Trying to allocate 0 bytes
Apr 14 09:28:05 mailstore dovecot: pop3(user@domain.net pid:39688 session:): Error: Raw backtrace:
/usr/lib/dovecot/libdovecot.so.0(+0x6bb0a) [0x7f1ae9a18b0a] -> /usr/lib/dovecot/libdovecot.
so.0(+0x6bb86) [0x7f1ae9a18b86] -> /usr/lib/dovecot/libdovecot.so.0(i_error+0) [0x7f1ae99d1e8f] -> /usr/lib/dovecot/libdovecot.so.0(+0x8148b)
[0x7f1ae9a2e48b] -> dovecot/pop3() [0x4077f0] -> dovecot/pop3(client_command_execute+0x9d) [0x4
07d0d] -> dovecot/pop3(client_handle_input+0x80) [0x405810] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x4e) [0x7f1ae9a28d2e] ->
/usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0xaf) [0x7f1ae9a29e9f] -> /usr/lib/do
vecot/libdovecot.so.0(io_loop_handler_run+0x9) [0x7f1ae9a28db9] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x7f1ae9a28e38] ->
/usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7f1ae99d6c43] -> dovecot/pop3(main+0x2
57) [0x404a67] -> /lib/libc.so.6(__libc_start_main+0xfd) [0x7f1ae9669c8d] -> dovecot/pop3() [0x4045b9]
Apr 14 09:28:05 mailstore dovecot: pop3(user@domain.net pid:39688 session:): Fatal: master: service(pop3): child 39688 killed with
signal 6 (core dumps disabled)
....
Have you any idea what the error could be?
As this is a production server I switched back to version 2.1.17.
Many thanks
Urban Loesch
doveconf -n:
# 2.2.12 (978871ca81e7): /etc/dovecot/dovecot.conf
# OS: Linux 3.4.67-vs2.3.3.9-rol-em64t-efigpt x86_64 Debian 6.0.9 ext4
auth_cache_negative_ttl = 0
auth_cache_size = 40 M
auth_cache_ttl = 1 weeks
auth_mechanisms = plain login
auth_verbose = yes
deliver_log_format = msgid=%m: %$ %p %w
disable_plaintext_auth = no
login_trusted_networks = $INTERNAL_IPS
mail_gid = mailstore
mail_location = mdbox:/home/vmail/%d/%n:INDEX=/home/dovecotindex/%d/%n
mail_log_prefix = "%s(%u pid:%p session:<%{session}>): "
mail_plugins = " quota mail_log notify zlib"
mail_uid = mailstore
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags
copy include variables body enotify environment mailbox date ihave imapflags notify
mdbox_rotate_size = 10 M
namespace inbox {
inbox = yes
location =
mailbox Drafts {
special_use = \Drafts
}
mailbox Junk {
special_use = \Junk
}
mailbox Sent {
special_use = \Sent
}
mailbox "Sent Items" {
special_use = \Sent
}
mailbox "Sent Messages" {
special_use = \Sent
}
mailbox Trash {
special_use = \Trash
}
prefix =
separator = /
type = private
}
passdb {
args = /etc/dovecot/dovecot-sql-account.conf
driver = sql
}
plugin {
mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename
mail_log_fields = uid box msgid size from
mail_log_group_events = no
quota = dict:Storage used::file:%h/dovecot-quota
quota_rule2 = Trash:storage=+100M
quota_warning = storage=95%% quota-warning 95 %u
quota_warning2 = storage=80%% quota-warning 80 %u
sieve = ~/.dovecot.sieve
sieve_dir = ~/sieve
sieve_extensions = +notify +imapflags
sieve_max_redirects = 10
zlib_save = gz
zlib_save_level = 9
}
protocols = imap pop3 lmtp sieve
service auth {
unix_listener auth-userdb {
group = mailstore
mode = 0660
user = root
}
}
service imap-login {
inet_listener imap {
port = 143
}
process_limit = 256
process_min_avail = 25
service_count = 1
}
service imap {
process_limit = 256
process_min_avail = 25
service_count = 1
}
service lmtp {
inet_listener lmtp {
address = *
port = 24
}
unix_listener /var/spool/postfix/private/dovecot-lmtp {
group = postfix
mode = 0666
user = postfix
}
}
service pop3-login {
inet_listener pop3 {
port = 110
}
process_limit = 256
process_min_avail = 25
service_count = 1
}
service pop3 {
process_limit = 256
process_min_avail = 25
service_count = 1
}
service quota-warning {
executable = script /usr/local/rol/dovecot/quota-warning.sh
unix_listener quota-warning {
user = mailstore
}
user = mailstore
}
ssl = no
ssl_cert = 
mail_max_userip_connections = 40
mail_plugins = " quota mail_log notify zlib imap_quota imap_zlib"
}
protocol pop3 {
mail_plugins = " quota mail_log notify zlib"
pop3_logout_format = bytes_sent=%o top=%t/%p, retr=%r/%b, del=%d/%m, size=%s uidl_hash=%u session=<%{session}>
pop3_reuse_xuidl = yes
}