[Dovecot] dovecot: child 1690 (auth-worker) killed with signal 11

[Thomas Zajic]

Hi there,

I've been seeing this for quite a while now, but only today finally got
off my lazy you-know-what and did a backtrace. Here's the requested info
as per http://dovecot.org/bugreport.html:


* Dovecot version

[root at airframe]:~# dovecot --version
1.0.3


* Operating system or Linux distribution name

Slackware 10.2, both kernel 2.6.21.3 and dovecot self-compiled


* CPU architecture (x86 or something else?)

x86 (AMD Athlon XP 3200+)


* Filesystem you used (especially if you use NFS or not)

ext3, local (no NFS)


* Some kind of description of what you were doing and with what IMAP client.

Thunderbird 2.0.0.4   (also happened with earlier versions)
mail-notification-4.1 ("    "        "    "       "       )


* If the problem can be reproduced, it helps a lot if you can tell how.

Happens in almost regular intervals, not sure when exactly though. Usually
when doing something in TB again (deleting or moving mails) after it has
been sitting idling for a while. From the log files going back to July 22nd:

[root at airframe]:~# grep "dovecot: child .* (auth-worker) killed with signal 11" /var/log/maillog* | wc -l
258

TB is configured to use TLS and secure authentication, use IDLE, and 5
cached server connections. Mail Notification is configured to use TLS,
and to autodetect both the authentication mechanism and IDLE availability.


* Dovecot configuration with dovecot -n

[root at airframe]:~# dovecot -n
# 1.0.3: /usr/local/etc/dovecot.conf
login_dir: /usr/local/var/run/dovecot/login
login_executable: /usr/local/libexec/dovecot/imap-login
login_greeting_capability: yes
verbose_proctitle: yes
mail_location: maildir:/home/%u/Maildir:INBOX=/home/%u/Maildir/.INBOX
mail_debug: yes
fsync_disable: yes
maildir_copy_with_hardlinks: yes
mail_drop_priv_before_exec: yes
auth default:
  mechanisms: plain digest-md5 cram-md5
  debug: yes
  passdb:
    driver: shadow
    args: blocking=yes
  passdb:
    driver: passwd-file
    args: /usr/local/etc/dovecot-passwd
  userdb:
    driver: passwd
    args: blocking=yes


* Backtrace

[root at airframe]:~# gdb /usr/local/libexec/dovecot/dovecot-auth /usr/local/stow/dovecot-data/var/run/dovecot/core
GNU gdb 6.3
[...]
Core was generated by `dovecot-auth -w'.
Program terminated with signal 11, Segmentation fault.
[...]
(gdb) bt full
#0  0x00000000 in ?? ()
No symbol table info available.
#1  0x08056954 in auth_worker_handle_passl (client=0x8089e18, id=3, 
    args=0x808a082 "user=zlatko-mail\tservice=IMAP\tlip=192.168.1.3\trip=192.168.1.1\tsecured=1") at auth-worker-client.c:242
        auth_request = (struct auth_request *) 0x808a3f0
        credentials_str = 0x2 <Address 0x2 out of bounds>
#2  0x08056c15 in auth_worker_handle_line (client=0x8089e18, 
    line=0x808a078 "PASSL\t1\t2\tuser=zlatko-mail\tservice=IMAP\tlip=192.168.1.3\trip=192.168.1.1\tsecured=1") at auth-worker-client.c:326
        id = 3
#3  0x08056ca7 in auth_worker_input (context=0x8085ac8) at auth-worker-client.c:359
        client = (struct auth_worker_client *) 0x8089e18
        line = 0x808a076 "3\tPASSL\t1\t2\tuser=zlatko-mail\tservice=IMAP\tlip=192.168.1.3\trip=192.168.1.1\tsecured=1"
        ret = 118
#4  0x0806b841 in io_loop_handler_run (ioloop=0x80851a8) at ioloop-poll.c:199
        ctx = (struct ioloop_handler_context *) 0x80851d0
        pollfd = (struct pollfd *) 0x80851f0
        tv = {tv_sec = 1, tv_usec = 999620}
        io = (struct io *) 0x8089f88
        t_id = 2
        msecs = 134765256
        ret = 0
        call = true
#5  0x0806ae89 in io_loop_run (ioloop=0x80851a8) at ioloop.c:329
No locals.
#6  0x0805a04b in main (argc=2, argv=0xbfa36e98) at main.c:321
        foreground = false
(gdb) 


Please let me know if you need any additional info (log snippets, etc.).

Thanks,
Thomas
-- 
=-------------------------------------------------------------------------=
- Thomas "ZlatkO" Zajic  <zlatko at gmx.at>   Linux-2.6.21 & Thunderbird-2.0 -
-  "It is not easy to cut through a human head with a hacksaw."  (M. C.)  -
=-------------------------------------------------------------------------=