Ubuntu 18.04, AMD Opteron, Dovecot Version 2.3.3, local file storage. I believe it's one of my users checking mail remotely via mobile - don't remember if it's an iPhone or Android.
gdb backtrace:
Reading symbols from /usr/local/libexec/dovecot/imap...done.
[New LWP 13852]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `dovecot/imap [kkhany@amfes.c'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 event_want_debug_log (event=event@entry=0x0,
source_filename=source_filename@entry=0x7efd84178aa3 "mail-storage.c",
source_linenum=source_linenum@entry=1261) at event-log.c:120
120 if (event->forced_debug)
(gdb) bt full
#0 event_want_debug_log (event=event@entry=0x0,
source_filename=source_filename@entry=0x7efd84178aa3 "mail-storage.c",
source_linenum=source_linenum@entry=1261) at event-log.c:120
ctx = {type = LOG_TYPE_DEBUG, exit_status = 0, timestamp = 0x0,
timestamp_usecs = 0, log_prefix = 0x0,
log_prefix_type_pos = 0}
#1 0x00007efd83dc0986 in event_want_debug (event=event@entry=0x0,
source_filename=source_filename@entry=0x7efd84178aa3
"mail-storage.c", source_linenum=source_linenum@entry=1261)
at event-log.c:140
No locals.
#2 0x00007efd840bf270 in mailbox_open_full
(box=box@entry=0x55704dc81058, input=input@entry=0x0) at mail-storage.c:1259
_tmp_event = 0x0
ret = <optimized out>
#3 0x00007efd840bf57a in mailbox_open_full (input=0x0,
box=0x55704dc81058) at mail-storage.c:1368
ret = <optimized out>
ret = <optimized out>
_tmp_event = <optimized out>
_data_stack_cur_id = <optimized out>
_data_stack_cur_id = <optimized out>
#4 mailbox_open (box=0x55704dc81058) at mail-storage.c:1349
No locals.
#5 0x000055704c36a31b in select_open (readonly=false,
mailbox=<optimized out>, ctx=0x55704dc13bc8) at cmd-select.c:288
client = 0x55704dc11de8
status = {messages = 1830951344, recent = 32766, unseen =
2391910144, uidvalidity = 1475818629, uidnext = 1830951424,
first_unseen_seq = 32766, first_recent_uid = 1832402502,
last_cached_seq = 32766, highest_modseq = 0,
highest_pvt_modseq = 4294967296, keywords = 0x55704dbf1380,
permanent_flags = 1280910144, flags = 21872,
permanent_keywords = false, allow_new_keywords = false,
nonpermanent_modseqs = false, no_modseq_tracking = false,
have_guids = false, have_save_guids = true, have_only_guid128
= false}
flags = <optimized out>
---Type <return> to continue, or q <return> to quit---
ret = 0
client = <optimized out>
status = <optimized out>
flags = <optimized out>
ret = <optimized out>
#6 cmd_select_full (cmd=<optimized out>, readonly=<optimized out>) at
cmd-select.c:417
client = 0x55704dc11de8
ctx = <optimized out>
args = 0x55704dbef690
list_args = 0x5d0000006e
mailbox = 0x55704dbe1540 "shared"
error = 0x55704dc11de8 ""
ret = <optimized out>
__func__ = "cmd_select_full"
#7 0x000055704c371e30 in command_exec (cmd=cmd@entry=0x55704dc13a38) at
imap-commands.c:201
hook = 0x55704dbeb0f0
finished = <optimized out>
__func__ = "command_exec"
#8 0x000055704c3701d2 in client_command_input (cmd=<optimized out>,
cmd@entry=0x55704dc13a38) at imap-client.c:1152
client = 0x55704dc11de8
command = <optimized out>
__func__ = "client_command_input"
#9 0x000055704c370274 in client_command_input (cmd=<optimized out>) at
imap-client.c:1215
client = 0x55704dc11de8
command = <optimized out>
__func__ = "client_command_input"
#10 0x000055704c370675 in client_handle_next_command
(remove_io_r=<synthetic pointer>, client=0x55704dc11de8) at
imap-client.c:1257
---Type <return> to continue, or q <return> to quit---
No locals.
#11 client_handle_input (client=0x55704dc11de8) at imap-client.c:1271
_data_stack_cur_id = 3
ret = <optimized out>
remove_io = false
ret = <optimized out>
remove_io = <optimized out>
client = 0x55704dc11de8
handled_commands = <optimized out>
_data_stack_cur_id = <optimized out>
ret = <optimized out>
remove_io = <optimized out>
_data_stack_cur_id = <optimized out>
#12 0x000055704c370ccc in client_input (client=0x55704dc11de8) at
imap-client.c:1317
cmd = 0x55704dc0bcb0
output = 0x55704dc2d150
bytes = 17
__func__ = "client_input"
#13 0x00007efd83ddae0f in io_loop_call_io (io=0x55704dc13910) at
ioloop.c:698
ioloop = 0x55704dbe9ee0
t_id = 2
__func__ = "io_loop_call_io"
#14 0x00007efd83ddc7c6 in io_loop_handler_run_internal
(ioloop=ioloop@entry=0x55704dbe9ee0) at ioloop-epoll.c:221
ctx = 0x55704dbedc00
events = <optimized out>
event = <optimized out>
list = 0x55704dc13970
---Type <return> to continue, or q <return> to quit---
io = <optimized out>
tv = {tv_sec = 1799, tv_usec = 999365}
events_count = <optimized out>
msecs = <optimized out>
ret = <optimized out>
i = 0
j = <optimized out>
call = <optimized out>
__func__ = "io_loop_handler_run_internal"
#15 0x00007efd83ddaf1c in io_loop_handler_run (ioloop=<optimized out>)
at ioloop.c:750
No locals.
#16 0x00007efd83ddb138 in io_loop_run (ioloop=0x55704dbe9ee0) at
ioloop.c:723
__func__ = "io_loop_run"
#17 0x00007efd83d50873 in master_service_run (service=0x55704dbe9d70,
callback=<optimized out>) at master-service.c:775
No locals.
#18 0x000055704c362611 in main (argc=<optimized out>, argv=<optimized
out>) at main.c:521
set_roots = {0x55704c5909a0
doveconf -n:
# 2.3.3 (dcead646b): /usr/local/etc/dovecot/dovecot.conf # Pigeonhole version 0.5.3 (f018bbab) # OS: Linux 4.15.0-43-generic x86_64 Ubuntu 18.04.1 LTS # Hostname: bubba.amfes.lan auth_cache_size = 4 k auth_master_user_separator = * auth_mechanisms = plain login default_login_user = nobody default_vsz_limit = 1 G dict { acl = mysql:/usr/local/etc/dovecot/dovecot-dict-sql.conf.ext } disable_plaintext_auth = no imap_client_workarounds = tb-extra-mailbox-sep imap_idle_notify_interval = 29 mins listen = * mail_attachment_hash = %{sha512} mail_plugins = fts fts_solr acl zlib virtual mail_prefetch_count = 10 mail_shared_explicit_inbox = yes 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 { hidden = no inbox = yes list = yes location = mailbox "Deleted Messages" { auto = no autoexpunge = 30 days special_use = \Trash } mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox INBOX/Archives { auto = no special_use = \Archive } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Items" { auto = no special_use = \Sent } mailbox "Sent Messages" { auto = no special_use = \Sent } mailbox Trash { auto = subscribe autoexpunge = 30 days special_use = \Trash } mailbox virtual/Flagged { comment = All my flagged messages special_use = \Flagged } prefix = separator = / subscriptions = yes type = private } namespace usershares { list = children location = sdbox:/var/mail/%%d/%%n/sdbox prefix = shared/%%n/ separator = / subscriptions = no type = shared } namespace virtual { list = children location = virtual:/var/mail/%d/%n/virtual prefix = virtual/ separator = / subscriptions = no } passdb { args = /usr/local/etc/dovecot/master-users driver = passwd-file master = yes } passdb { args = /usr/local/etc/dovecot/dovecot-ldap.conf.ext driver = ldap } plugin { acl = vfile:/usr/local/etc/dovecot/global-acls:cache_secs=300 acl_shared_dict = proxy::acl fts = solr fts_autoindex = yes fts_solr = break-imap-search url=http://127.0.0.1:8983/solr/dovecot/ mailbox_alias_new = Sent Messages mailbox_alias_new2 = Sent Items mailbox_alias_new3 = Deleted Messages mailbox_alias_old = Sent mailbox_alias_old2 = Sent mailbox_alias_old3 = Trash sieve = file:~/sieve;active=~/.dovecot.sieve } protocols = imap lmtp sieve service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } unix_listener auth-userdb { group = mail mode = 0600 user = vmail } } service dict { unix_listener dict { group = mail mode = 0660 user = vmail } } service imap-login { process_min_avail = 10 service_count = 1 } service imap-postlogin { executable = script-login /usr/local/etc/dovecot/post-login.sh user = $default_internal_user } service imap { executable = imap imap-postlogin } service lmtp { process_min_avail = 5 unix_listener /var/spool/postfix/private/dovecot-lmtp { group = mail mode = 0666 user = vmail } } service managesieve-login { inet_listener sieve { port = 4190 } inet_listener sieve_deprecated { port = 2000 } process_min_avail = 0 service_count = 1 } ssl_cert =
-- Daniel