assertion failed: (srcleft <= CHARSET_MAX_PENDING_BUF_SIZE)

21 Dec 2018


      I'm running the following:
# 2.3.4 (0ecbaf23d): /usr/local/etc/dovecot/dovecot.conf
# OS: FreeBSD 11.2-RELEASE-p4 amd64
# FS: ZFS
auth_mechanisms = plain login
auth_username_format = %Ln
listen = *
mail_location = maildir:~/Maildir
namespace inbox {
inbox = yes
location =
mailbox Drafts {
auto = subscribe
special_use = \Drafts
}
mailbox Junk {
auto = subscribe
special_use = \Junk
}
mailbox Sent {
special_use = \Sent
}
mailbox Trash {
auto = subscribe
special_use = \Trash
}
prefix =
}
passdb {
driver = pam
}
protocols = imap lmtp
service auth {
unix_listener /var/spool/postfix/private/auth {
group = postfix
mode = 0666
user = postfix
}
user = dovecot
}
service imap-login {
inet_listener imap {
port = 0
}
}
service lmtp {
unix_listener /var/spool/postfix/private/dovecot-lmtp {
group = postfix
mode = 0600
user = postfix
}
}
service stats {
unix_listener stats-reader {
group =
mode = 0600
user =
}
unix_listener stats-writer {
group = $default_internal_group
mode = 0666
user =
}
user = $default_internal_user
}
ssl_cert = 
dmesg shows:
pid 74441 (imap), uid 1002: exited on signal 6
pid 74784 (imap), uid 1002: exited on signal 6
pid 21471 (imap), uid 1002: exited on signal 6
pid 21470 (imap), uid 1002: exited on signal 6
pid 21464 (imap), uid 1002: exited on signal 6
pid 21731 (imap), uid 1002: exited on signal 6
Sometimes the dovecot process serving an user crashes. He runs mostly
airmail on macOS and samsung mail on Android.
Happens only to that particular user.
The log shows the following: (maillog)
Dec 16 14:52:35 mail dovecot: imap-login: Login: user=<USER>, method=PLAIN,
rip=79.12.201.157, lip=192.168.1.28, mpid=74779, TLS,
session=
Dec 16 14:52:39 mail dovecot: imap(USER)<74441>: Panic:
file charset-iconv.c: line 83 (charset_to_utf8_try): assertion failed:
(srcleft <= CHARSET_MAX_PENDING_BUF_SIZE)
Dec 16 14:52:39 mail dovecot: imap(USER)<74441>: Fatal:
master: service(imap): child 74441 killed with signal 6 (core not dumped -
https://dovecot.org/bugreport.html#coredumps - set service imap {
drop_priv_before_exec=yes })
I'm here if more info is needed.
Thanks for taking a look.

assertion failed: (srcleft <= CHARSET_MAX_PENDING_BUF_SIZE)

Giacomo