Panic: file istream-seekable.c: line 226

26 Nov 2020


      Hi,
I have a lot of Panic in my logs.
They happen almost every day and never on the same user.
When it happens, the mail is not distributed (it's always lda).
I discovered it because my Sympa server had a lot of users in error.
The last error (below) was a local user sending a mail to 10 users : 3
of them
never get the email.
I've looked into my logs and discovered it started after the upgrade
from 2.2.27 to 2.3.4 in february. I'm on Debian.
This week, I installed the dovecot repo and upgraded to the very last
and same thing. The error below happened after the latest upgrade.
An example :
Nov 25 11:33:07 mx.igf.cnrs.fr dovecot:
lda(username_hidden)<4653>: Panic: file
istream-seekable.c: line 230 (read_from_buffer): assertion failed:
(*ret_r > 0)
Nov 25 11:33:07 mx.igf.cnrs.fr dovecot:
lda(sebastien.granier)<4653>: Error: Raw
backtrace: /usr/lib/dovecot/libdovecot.so.0(backtrace_append+0x3d)
[0x7f49a56d4eed] -> /usr/lib/dovecot/libdovecot.so.0(backtrace_get+0x1e)
[0x7f49a56d500e] -> /usr/lib/dovecot/libdovecot.so.0(+0xf465b)
[0x7f49a56de65b] -> /usr/lib/dovecot/libdovecot.so.0(+0xf46c1)
[0x7f49a56de6c1] -> /usr/lib/dovecot/libdovecot.so.0(+0x514a6)
[0x7f49a563b4a6] -> /usr/lib/dovecot/libdovecot.so.0(+0x53cfb)
[0x7f49a563dcfb] -> /usr/lib/dovecot/libdovecot.so.0(+0x1074a1)
[0x7f49a56f14a1] -> /usr/lib/dovecot/libdovecot.so.0(+0x1078f6)
[0x7f49a56f18f6] -> /usr/lib/dovecot/libdovecot.so.0(i_stream_stat+0x34)
[0x7f49a56eaab4] -> /usr/lib/dovecot/libdovecot-storage.so.0(+0xb1396)
[0x7f49a5852396] -> /usr/lib/dovecot/libdovecot-storage.so.0(+0xb1472)
[0x7f49a5852472] ->
/usr/lib/dovecot/libdovecot-storage.so.0(mail_get_physical_size+0x38)
[0x7f49a57ef0c8] -> /usr/lib/dovecot/libdovecot-lda.so.0(+0x4005)
[0x7f49a5907005] ->
/usr/lib/dovecot/libdovecot-lda.so.0(mail_deliver_init+0x141)
[0x7f49a5908101] -> /usr/lib/dovecot/deliver(main+0x879)
[0x562d1c0e6f99] ->
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb) [0x7f49a543e09b]
-> /usr/lib/dovecot/deliver(_start+0x2a) [0x562d1c0e76ea]
My configuration :
dovecot -n
# 2.3.11.3 (502c39af9): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.11 (6c69c917)
# OS: Linux 4.19.0-9-amd64 x86_64 Debian 10.6
# Hostname: mx.igf.cnrs.fr
auth_username_format =
disable_plaintext_auth = no
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
mail_location = maildir:~/maildir
mail_plugins = fts
mail_privileged_group = mail
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 index ihave duplicate mime foreverypart
extracttext
namespace inbox {
inbox = yes
location =
mailbox Ads {
auto = subscribe
}
mailbox Drafts {
special_use = \Drafts
}
mailbox Junk {
special_use = \Junk
}
mailbox Sent {
special_use = \Sent
}
mailbox "Sent Messages" {
special_use = \Sent
}
mailbox Trash {
special_use = \Trash
}
prefix =
separator = .
type = private
}
passdb {
driver = pam
}
plugin {
sieve = file:~/sieve;active=~/.dovecot.sieve
sieve_after = /etc/dovecot/sieve.d
}
protocols = " imap sieve pop3 sieve"
service auth {
unix_listener /var/spool/postfix/private/auth {
group = postfix
mode = 0666
user = postfix
}
}
service imap-login {
process_min_avail = 16
service_count = 0
}
service managesieve-login {
inet_listener sieve {
port = 4190
}
}
service stats {
unix_listener stats-reader {
group = dovecot
mode = 0666
user = root
}
unix_listener stats-writer {
group = dovecot
mode = 0666
user = root
}
}
ssl_cert = 
Thanks,
--
Eric Mauger | Administrateur système et réseau
IGF UMR5203 | https://www.igf.cnrs.fr