New subject: imap segfaults when using antispam plugin, and moving mail to an 'unsure' folder.

12 Aug 2015


      I put up a question on serverfault first, which has the details,
including a stack trace:
http://serverfault.com/questions/713687/dovecot-antispam-error-storing-mail
.  Details also copied below.
Is this a known bug?  If I built dovecot from source rather than using
the Ubuntu 14.04 packages, would I expect that to help?  Are there any
configuration details that might be relevant?  (dovecot -n output shown
Any help much appreciated.
Andrew McNaughton
Details on the serverfault page repeated below, plus a little more.

Ubuntu 14.04.3   x86_64
Running inside lxc-docker 1.7.0
dovecot-imapd 1:2.2.9-1ubuntu2
dovecot-antispam 2.0+20130822-2build1
Filesystem is via docker, so aufs is involved, and under that on the
host systems is ext4

I know mail is not supposed to be moved into a mailbox of type 'unsure'.
The server should refuse this action. What actually happens though is
that the imap process throws an error and dies:
Aug 12 17:53:07 255c7fc2d2f0 imap: antispam:
mailbox_is_unsure(Review-Classification): 1
Aug 12 17:53:07 255c7fc2d2f0 dovecot: imap(user@example.com): Panic:
file mail-storage.c: line 2141 (mailbox_copy): assertion failed:
(!ctx->unfinished)
Aug 12 17:53:07 255c7fc2d2f0 dovecot: imap(user@example.com): Error: Raw
backtrace: /usr/lib/dovecot/libdovecot.so.0(+0x5e271) [0x7f718e7dd271]
-> /usr/lib/dovecot/libdovecot.so.0(+0x5e34e) [0x7f718e7dd34e] ->
/usr/lib/dovecot/libdovecot.so.0(i_fatal+0) [0x7f718e798a9e] ->
/usr/lib/dovecot/libdovecot-storage.so.0(+0x7196f) [0x7f718eab896f] ->
/usr/lib/dovecot/libdovecot-storage.so.0(mailbox_move+0x15)
[0x7f718eab8985] -> dovecot/imap(+0xded5) [0x7f718ef84ed5] ->
dovecot/imap(command_exec+0x3c) [0x7f718ef8f6dc] ->
dovecot/imap(+0x176cf) [0x7f718ef8e6cf] -> dovecot/imap(+0x17785)
[0x7f718ef8e785] -> dovecot/imap(client_handle_input+0x125)
[0x7f718ef8eaa5] -> dovecot/imap(client_input+0x75) [0x7f718ef8ee35] ->
/usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x27) [0x7f718e7ed247]
-> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0xd7)
[0x7f718e7edfd7] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x38)
[0x7f718e7ecde8] ->
/usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13)
[0x7f718e79dc93] -> dovecot/imap(main+0x2c4) [0x7f718ef832f4] ->
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7f718e3dbec5]
-> dovecot/imap(+0xc460) [0x7f718ef83460]
Aug 12 17:53:07 255c7fc2d2f0 dovecot: imap(user@example.com): Fatal:
master: service(imap): child 58 killed with signal 6 (core dumped)

root@8ec9579667fc:/# gdb /usr/lib/dovecot/imap /tmp/61
GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/lib/dovecot/imap...Reading symbols from
/usr/lib/debug//usr/lib/dovecot/imap...done.
done.
[New LWP 61]
Core was generated by `dovecot/imap'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007f5dd5394cc9 in __GI_raise (sig=sig@entry=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:56
56      ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt full
#0  0x00007f5dd5394cc9 in __GI_raise (sig=sig@entry=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:56
resultvar = 0
pid = 61
selftid = 61
#1  0x00007f5dd53980d8 in __GI_abort () at abort.c:89
save_stage = 2
act = {__sigaction_handler = {sa_handler = 0x800, sa_sigaction =
0x800}, sa_mask = {__val = {140041026109520, 178, 140041026077952, 512,
140040990095251, 140041026077952, 140041026077952, 512,
140040990087565, 140734823456136, 140040990231826, 140041026077952,
140734823456040, 0,
140040990231929, 140041026077952}}, sa_flags = -713567062,
sa_restorer = 0x7fff6128dd01}
sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f5dd5781298 in default_fatal_finish (type=<optimized out>,
status=status@entry=0) at failures.c:192
backtrace = 0x7f5dd79d0538
"/usr/lib/dovecot/libdovecot.so.0(+0x5e271) [0x7f5dd5781271] ->
/usr/lib/dovecot/libdovecot.so.0(+0x5e34e) [0x7f5dd578134e] ->
/usr/lib/dovecot/libdovecot.so.0(i_fatal+0) [0x7f5dd573ca9e] ->
/usr/lib/d"...
#3  0x00007f5dd578134e in i_internal_fatal_handler (ctx=0x7fff6128dd70,
format=<optimized out>, args=<optimized out>) at failures.c:653
status = 0
#4  0x00007f5dd573ca9e in i_panic (format=format@entry=0x7f5dd5ab1e68
"file %s: line %d (%s): assertion failed: (%s)") at failures.c:264
ctx = {type = LOG_TYPE_PANIC, exit_status = 0, timestamp = 0x0}
args = {{gp_offset = 40, fp_offset = 48, overflow_arg_area =
0x7fff6128de60, reg_save_area = 0x7fff6128dda0}}
#5  0x00007f5dd5a5c96f in mailbox_copy (_ctx=<optimized out>,
mail=mail@entry=0x7f5dd79ffbc0) at mail-storage.c:2141
ctx = 0x7f5dd7a043e0
t = 0x7f5dd79fdf00
keywords = 0x0
pvt_flags = 0
real_mail = <optimized out>
ret = -1
__FUNCTION__ = "mailbox_copy"
#6  0x00007f5dd5a5c985 in mailbox_move (_ctx=<optimized out>,
mail=0x7f5dd79ffbc0) at mail-storage.c:2153
ctx = 0x7f5dd7a043e0
#7  0x00007f5dd5f28ed5 in fetch_and_copy (copy_count_r=<synthetic
pointer>, src_uidset_r=<synthetic pointer>, search_args=<optimized out>,
src_trans_r=0x7fff6128df18, t=<optimized out>, move=true,
client=0x7f5dd79ee440) at cmd-copy.c:67
search_ctx = 0x7f5dd79ff920
src_trans = 0x7f5dd79fec10
srcset_ctx = {str = 0x7f5dd79d0350, first_uid = 0, last_uid =
4294967295}
ret = 1
save_ctx = 0x0
mail = 0x7f5dd79ffbc0
copy_count = 1
src_uidset = 0x7f5dd79d0350
#8  cmd_copy_full (cmd=0x7f5dd79eee70, move=<optimized out>) at
cmd-copy.c:123
client = 0x7f5dd79ee440
dest_storage = <optimized out>
destbox = 0x7f5dd79f8d10
t = 0x7f5dd79fdf00
src_trans = 0x7f5dd573d029 <t_pop_check+9>
search_args = 0x7f5dd79f73a0
messageset = 0x7f5dd79dbc10 "76"
mailbox = 0x7f5dd79dbc18 "Review-Classification"
src_uidset = <optimized out>
sync_flags = (unknown: 0)
imap_flags = (unknown: 0)
changes = {pool = 0x7f5dd79d0350, uid_validity = 0, saved_uids =
{arr = {buffer = 0x1, element_size = 140040986301132}, v = 0x1,
v_modifiable = 0x1},
ignored_modseq_changes = 3617438728, changed = 93,
no_read_perm = 127}
msg = <optimized out>
ret = <optimized out>
__FUNCTION__ = "cmd_copy_full"
#9  0x00007f5dd5f336dc in command_exec (cmd=0x7f5dd79eee70) at
imap-commands.c:158
hook = 0x7f5dd79d90d0
ret = <optimized out>
#10 0x00007f5dd5f326cf in client_command_input (cmd=0x7f5dd79eee70) at
imap-client.c:780
client = 0x7f5dd79ee440
command = <optimized out>
__FUNCTION__ = "client_command_input"
#11 0x00007f5dd5f32785 in client_command_input (cmd=0x7f5dd79eee70) at
imap-client.c:841
client = 0x7f5dd79ee440
command = <optimized out>
__FUNCTION__ = "client_command_input"
#12 0x00007f5dd5f32aa5 in client_handle_next_command
(remove_io_r=<synthetic pointer>, client=0x7f5dd79ee440) at
imap-client.c:879
No locals.
#13 client_handle_input (client=client@entry=0x7f5dd79ee440) at
imap-client.c:891
_data_stack_cur_id = 3
remove_io = false
handled_commands = false
__FUNCTION__ = "client_handle_input"
#14 0x00007f5dd5f32e35 in client_input (client=0x7f5dd79ee440) at
imap-client.c:933
cmd = 0x7f5dd79e5ae0
output = 0x7f5dd79eeca0
bytes = 39
__FUNCTION__ = "client_input"
#15 0x00007f5dd5791247 in io_loop_call_io (io=0x7f5dd79eed90) at
ioloop.c:388
ioloop = 0x7f5dd79d8720
t_id = 2
#16 0x00007f5dd5791fd7 in io_loop_handler_run
(ioloop=ioloop@entry=0x7f5dd79d8720) at ioloop-epoll.c:220
ctx = 0x7f5dd79d93b0
list = 0x7f5dd79dade0
io = <optimized out>
tv = {tv_sec = 1799, tv_usec = 999178}
events_count = <optimized out>
msecs = <optimized out>
ret = 1
i = 0
call = <optimized out>
__FUNCTION__ = "io_loop_handler_run"
#17 0x00007f5dd5790de8 in io_loop_run (ioloop=0x7f5dd79d8720) at
ioloop.c:412
__FUNCTION__ = "io_loop_run"
#18 0x00007f5dd5741c93 in master_service_run (service=0x7f5dd79d85b0,
callback=<optimized out>) at master-service.c:566
No locals.
#19 0x00007f5dd5f272f4 in main (argc=1, argv=0x7f5dd79d8390) at main.c:400
set_roots = {0x7f5dd614aa00 <imap_setting_parser_info>, 0x0}
login_set = {auth_socket_path = 0x7f5dd79d0048 "\001",
postlogin_socket_path = 0x0, postlogin_timeout_secs = 60,
callback = 0x7f5dd5f3c0f0 <login_client_connected>,
failure_callback = 0x7f5dd5f3be20 <login_client_failed>,
request_auth_token = 1}
service_flags = <optimized out>
storage_service_flags = <optimized out>
username = 0x0
c = <optimized out>

root@8ec9579667fc:/# dovecot -n
2.2.9: /etc/dovecot/dovecot.conf
OS: Linux 3.13.0-43-generic x86_64 Ubuntu 14.04.3 LTS ext4
auth_debug = yes
auth_verbose = yes
disable_plaintext_auth = no
first_valid_gid = 150
first_valid_uid = 150
last_valid_gid = 150
last_valid_uid = 150
mail_debug = yes
mail_gid = vmail
mail_location =
maildir:/var/vmail/%d/%n/Maildir:INDEX=/var/vmail/%d/%n/Maildir/indexes
mail_uid = vmail
namespace inbox {
inbox = yes
location =
mailbox Attention-Not-Required {
auto = subscribe
special_use = \Junk
}
mailbox Attention {
auto = subscribe
}
mailbox Drafts {
auto = subscribe
special_use = \Drafts
}
mailbox Review-Classification {
auto = subscribe
}
mailbox Sent {
auto = subscribe
special_use = \Sent
}
mailbox Trash {
auto = subscribe
special_use = \Trash
}
prefix =
}
passdb {
args = /etc/dovecot/dovecot-sql.conf.ext
driver = sql
}
plugin {
antispam_backend = dspam
antispam_debug_target = syslog
antispam_dspam_args = --deliver=;--user;%u;
antispam_dspam_binary = /usr/bin/dspam
antispam_signature = X-DSPAM-Signature
antispam_signature_missing = error
antispam_spam = Attention-Not-Required
antispam_trash = Trash
antispam_unsure = Review-Classification
antispam_verbose_debug = 1
mail_log_events = delete undelete expunge copy mailbox_delete
mailbox_rename
mail_log_fields = uid box msgid size
sieve = ~/.dovecot.sieve
sieve_dir = ~/sieve
}
postmaster_address = postmaster@example.net
protocols = " imap lmtp"
service lmtp {
inet_listener lmtp {
address = 127.0.0.1
port = 24
}
user = vmail
}
ssl_cert = </etc/dovecot/dovecot.crt
ssl_key = </etc/dovecot/private/dovecot.key
ssl_protocols = TLSv1.2 TLSv1.1 TLSv1 !SSLv3 !SSLv2
userdb {
args = /etc/dovecot/dovecot-sql.conf.ext
driver = sql
}
protocol lmtp {
mail_plugins = " sieve"
}
protocol lda {
mail_plugins = " sieve"
}
protocol imap {
mail_plugins = " antispam"
}

imap segfaults when using antispam plugin, and moving mail to an 'unsure' folder.

Andrew McN

2.2.9: /etc/dovecot/dovecot.conf

OS: Linux 3.13.0-43-generic x86_64 Ubuntu 14.04.3 LTS ext4

Andrew McN

2.2.9: /etc/dovecot/dovecot.conf

OS: Linux 3.13.0-43-generic x86_64 Ubuntu 14.04.3 LTS ext4

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