[Dovecot] Panic in version 1.1.6

[Rob Mangiafico]

Hello,

We have seen a few of these panics in 1.1.6. It seems to happen when pine 
is being used and a POP3 check occurs at the same time (but not always), 
but I'm not positive this is always the case:

---
Nov 22 11:10:32 lexiconn2 dovecot: Panic: POP3(techjm): file istream.c: 
line 76 (i_stream_read): assertion failed: (_stream->
skip != _stream->pos)
Nov 22 11:10:32 lexiconn2 dovecot: POP3(techjm): Raw backtrace: pop3 
[0x80c38f0] -> pop3 [0x80c394a] -> pop3 [0x80c324c] -> p
op3(i_stream_read+0xda) [0x80c7dda] -> pop3 [0x80c9c6b] -> 
pop3(i_stream_read+0x2d) [0x80c7d2d] -> pop3 [0x80b9abe] -> pop3(i
_stream_read+0x2d) [0x80c7d2d] -> pop3(i_stream_read_data+0x1d) 
[0x80c7e3d] -> pop3(message_get_body_size+0x5c) [0x80be85c] -
> pop3(index_mail_init_stream+0x151) [0x8089571] -> pop3 [0x80717a2] -> 
pop3(index_mail_get_virtual_size+0x76) [0x80882b6] ->
  pop3(client_create+0x282) [0x8059c72] -> pop3(main+0x403) [0x805ba83] -> 
/lib/libc.so.6(__libc_start_main+0xdc) [0x492dec] -
> pop3 [0x8059351]

dovecot -n
# 1.1.6: /usr/local/etc/dovecot.conf
# OS: Linux 2.6.18-53.1.14.el5 i686 CentOS release 5.2 (Final)
protocols: imap imaps pop3 pop3s
ssl_cert_file: /usr/local/apache/conf/ssl.crt/lexiconn.com.cert
ssl_key_file: /usr/local/apache/conf/ssl.key/lexiconn.com.key
ssl_cipher_list: HIGH:MEDIUM:+TLSv1:!SSLv2:+SSLv3
disable_plaintext_auth: no
login_dir: /usr/local/var/run/dovecot/login
login_executable(default): /usr/local/libexec/dovecot/imap-login
login_executable(imap): /usr/local/libexec/dovecot/imap-login
login_executable(pop3): /usr/local/libexec/dovecot/pop3-login
mail_privileged_group: mail
mail_location: mbox:~/:INBOX=/var/spool/mail/%u
mail_full_filesystem_access: yes
mmap_disable: yes
fsync_disable: yes
mbox_write_locks: fcntl
mbox_very_dirty_syncs: yes
mail_executable(default): /usr/local/libexec/dovecot/imap
mail_executable(imap): /usr/local/libexec/dovecot/imap
mail_executable(pop3): /usr/local/libexec/dovecot/pop3
mail_process_size: 512
mail_plugin_dir(default): /usr/local/lib/dovecot/imap
mail_plugin_dir(imap): /usr/local/lib/dovecot/imap
mail_plugin_dir(pop3): /usr/local/lib/dovecot/pop3
pop3_uidl_format(default): %08Xu%08Xv
pop3_uidl_format(imap): %08Xu%08Xv
pop3_uidl_format(pop3): %08Xv%08Xu
pop3_client_workarounds(default):
pop3_client_workarounds(imap):
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
auth default:
   mechanisms: plain login
   username_format: %Lu
   verbose: yes
   passdb:
     driver: shadow
   userdb:
     driver: passwd
---

We've enabled core dumps to try and get a gdb backtrace the next time this 
happens.

Rob