Core dump during UID Search

[Bert JW Regeer]

It happened again:

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This GDB was configured as "amd64-marcel-freebsd"...(no debugging symbols found)...
Core was generated by `imap: [xistence at 0x58.com 2601:282:4301:befc:955c:10da:bfcb:2b3a UID SEARCH]'.
Program terminated with signal 6, Aborted.
#0  0x0000000011c0c47a in ?? ()
(gdb) bt
#0  0x0000000011c0c47a in ?? ()
#1  0x0000000011c0c444 in ?? ()
#2  0x0000000000018891 in cmd_store ()
#3  0x0000000011c0c3b9 in ?? ()
#4  0x0000000012216808 in ?? ()
#5  0x0000000000000005 in ?? ()
#6  0xffffffdf00000000 in ?? ()
#7  0xffffffffffffffff in ?? ()
#8  0x00007fffffffffff in ?? ()
#9  0x0000000000000005 in ?? ()
#10 0x00007fffffffe240 in ?? ()
#11 0x000000001189c6f6 in ?? ()
#12 0x0000000012355e28 in ?? ()
#13 0x00000000122de048 in ?? ()
#14 0x0000000000000000 in ?? ()

I really wish I could get some better backtrace information, but unfortunately this is it :-(

> On Nov 15, 2018, at 17:17, Bert JW Regeer <xistence at 0x58.com> wrote:
> 
> Hey all,
> 
> I keep finding core dumps of the IMAP process on my FreeBSD 11.2, however the backtrace is not very useful:
> 
> Core was generated by `imap: [xistence at 0x58.com 2601:282:4301:befc:1cfb:807f:e527:5a3b UID SEARCH]'.
> Program terminated with signal 6, Aborted.
> #0  0x0000000011c0c47a in ?? ()
> (gdb) bt
> #0  0x0000000011c0c47a in ?? ()
> #1  0x0000000011c0c444 in ?? ()
> #2  0x00000000000188b0 in cmd_store ()
> #3  0x0000000011c0c3b9 in ?? ()
> #4  0x0000000012216810 in ?? ()
> #5  0x0000000000000005 in ?? ()
> #6  0xffffffdf00000000 in ?? ()
> #7  0xffffffffffffffff in ?? ()
> #8  0x00007fffffffffff in ?? ()
> #9  0x0000000000000005 in ?? ()
> #10 0x00007fffffffe240 in ?? ()
> #11 0x000000001189c6f6 in ?? ()
> #12 0x0000000012355e28 in ?? ()
> #13 0x00000000122de048 in ?? ()
> #14 0x0000000000000000 in ?? ()
> (gdb)
> 
> I am sorry that I haven't been able to find any more information or figure out what is going on :-(
> 
> doveconf -n output follows:
> 
> doveconf -n
> # 2.3.2.1 (0719df592): /usr/local/etc/dovecot/dovecot.conf
> # Pigeonhole version 0.5.2 (7704de5e)
> # OS: FreeBSD 11.2-RELEASE-p4 amd64
> # Hostname: juxi.0x58.com
> auth_mechanisms = plain login
> first_valid_gid = 127
> first_valid_uid = 127
> hostname = butler.0x58.com
> last_valid_gid = 127
> last_valid_uid = 127
> lmtp_save_to_detail_mailbox = yes
> login_greeting = Assume the position.
> mail_gid = 127
> mail_home = /usr/local/vmail/domains/%d/%n
> mail_location = maildir:~/Maildir/
> mail_plugins = " quota trash zlib virtual "
> mail_uid = 127
> 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 duplicate
> namespace butler {
>  hidden = no
>  list = yes
>  location = virtual:/usr/local/vmail/virtual:LAYOUT=maildir++:INDEX=~/virtual
>  mailbox All {
>    auto = subscribe
>    special_use = \All
>  }
>  mailbox Flagged {
>    auto = subscribe
>    special_use = \Flagged
>  }
>  prefix = [Butler]/
>  separator = /
>  subscriptions = yes
>  type = private
> }
> namespace inbox {
>  inbox = yes
>  location =
>  mailbox Drafts {
>    special_use = \Drafts
>  }
>  mailbox Junk {
>    auto = subscribe
>    special_use = \Junk
>  }
>  mailbox Sent {
>    special_use = \Sent
>  }
>  mailbox "Sent Messages" {
>    special_use = \Sent
>  }
>  mailbox Trash {
>    special_use = \Trash
>  }
>  prefix =
>  separator = /
>  subscriptions = yes
> }
> passdb {
>  args = scheme=CRYPT username_format=%u /usr/local/vmail/domains/%d/passwd
>  driver = passwd-file
> }
> plugin {
>  fts = squat
>  quota = maildir:User quota
>  quota_rule = *:storage=5G
>  quota_rule2 = Trash:storage=+100M
>  quota_rule3 = Deleted Messages:storage=+100M
>  recipient_delimiter = +
>  sieve = ~/.dovecot.sieve
>  sieve_dir = ~/sieve
>  stats_refresh = 30 secs
> }
> postmaster_address = postmaster at butler.0x58.com
> protocols = imap lmtp sieve
> service auth {
>  unix_listener /var/spool/postfix/private/auth {
>    group = postfix
>    mode = 0666
>    user = postfix
>  }
>  unix_listener auth-userdb {
>    group = vmail
>    mode = 0666
>    user = vmail
>  }
> }
> service imap {
>  drop_priv_before_exec = yes
> }
> service lmtp {
>  unix_listener /var/spool/postfix/private/dovecot-lmtp {
>    group = postfix
>    mode = 0666
>    user = postfix
>  }
> }
> service managesieve-login {
>  inet_listener sieve {
>    port = 4190
>  }
> }
> service stats {
>  fifo_listener stats-mail {
>    mode = 0600
>    user = vmail
>  }
> }
> ssl_cert = </usr/home/letsencrypt/letsencrypt.sh/certs/butler.0x58.com/fullchain.pem
> ssl_cipher_list = HIGH:!SSLv2:!RC4:!3DES:!aNULL:@STRENGTH
> ssl_dh =  # hidden, use -P to show it
> ssl_key =  # hidden, use -P to show it
> ssl_prefer_server_ciphers = yes
> userdb {
>  args = username_format=%u /usr/local/vmail/domains/%d/passwd
>  default_fields = quota_rule=*:storage=3G
>  driver = passwd-file
> }
> verbose_proctitle = yes
> verbose_ssl = yes
> protocol lmtp {
>  mail_plugins = " quota trash zlib virtual sieve"
> }
> protocol lda {
>  mail_plugins = " quota trash zlib virtual sieve"
> }
> protocol imap {
>  mail_plugins = " quota trash zlib virtual fts fts_squat imap_quota imap_zlib"
> }