Hello,

I rebuilt mariadb and dovecot with debug symbols. The backtrace is this:

Program terminated with signal SIGABRT, Aborted. #0 0x00007fb040e0cd7f in raise () from /usr/lib/libc.so.6 (gdb) bt full #0 0x00007fb040e0cd7f in raise () from /usr/lib/libc.so.6 No symbol table info available. #1 0x00007fb040df7672 in abort () from /usr/lib/libc.so.6 No symbol table info available. #2 0x00007fb040e4f878 in __libc_message () from /usr/lib/libc.so.6 No symbol table info available. #3 0x00007fb040e5618a in malloc_printerr () from /usr/lib/libc.so.6 No symbol table info available. #4 0x00007fb040e57b27 in _int_free () from /usr/lib/libc.so.6 No symbol table info available. #5 0x00007fb04114db89 in mysql_close (mysql=0x5592728448e0) at /usr/src/debug/mariadb-10.3.12/libmariadb/libmariadb/mariadb_lib.c:1940 p = <optimized out> #6 mysql_close (mysql=0x5592728448e0) at /usr/src/debug/mariadb-10.3.12/libmariadb/libmariadb/mariadb_lib.c:1913 p = <optimized out> #7 0x00005592724e2dac in driver_sqlpool_disconnect (_db=0x559272843be0) at driver-sqlpool.c:590 conn__foreach_end = 0x559272844090 db = 0x559272843be0 conn = 0x559272844080 #8 0x00005592724d78fc in db_sql_unref (_conn=0x55927283b5e8) at db-sql.c:128 conn = 0x559272843818 #9 0x00005592724cf89c in userdb_deinit (userdb=0x55927283b5c0) at userdb.c:191 idx = 0 __func__ = "userdb_deinit" #10 0x00005592724afbb9 in auth_deinit (auth=0x55927283b320) at auth.c:335 passdb = <optimized out> userdb = 0x55927283b4e0 passdb = <optimized out> userdb = <optimized out> #11 auths_deinit () at auth.c:433 auth__foreach_end = 0x559272842e18 auth = 0x559272842e10 #12 0x00005592724ae664 in main_deinit () at main.c:271 l = <optimized out> l = <optimized out> l_end = <optimized out> #13 main (argc=<optimized out>, argv=<optimized out>) at main.c:398 c = <optimized out> (gdb)

My dovecot -n output is this:

0 « root » /home/smirky/stuff/ABS/dovecot # dovecot -n # 2.3.4 (0ecbaf23d): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.4 (60b0f48d) # OS: Linux 5.0.0-rc2-mainline x86_64 Arch Linux # Hostname: archy dict { quotadict = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext } mail_home = /home/vmail/%d/%u mail_location = maildir:~ mail_plugins = quota 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 i ndex ihave duplicate mime foreverypart extracttext imapsieve vnd.dovecot.imapsieve namespace inbox { inbox = yes location = mailbox Drafts { auto = create special_use = \Drafts } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { auto = no special_use = \Sent } mailbox Spam { auto = subscribe special_use = \Junk } mailbox Trash { auto = subscribe special_use = \Trash } prefix = } passdb { args = /etc/dovecot/dovecot-sql.conf driver = sql } plugin { imapsieve_mailbox1_before = file:/etc/dovecot/sieve/report-spam.sieve imapsieve_mailbox1_causes = COPY imapsieve_mailbox1_name = Spam imapsieve_mailbox2_before = file:/etc/dovecot/sieve/report-ham.sieve imapsieve_mailbox2_causes = COPY imapsieve_mailbox2_from = Junk imapsieve_mailbox2_name = * quota = dict:User quota::proxy::quotadict quota_rule2 = Trash:storage=+10%% quota_warning = storage=95%% quota-warning 95 %u quota_warning2 = storage=80%% quota-warning 80 %u quota_warning3 = -storage=100%% quota-warning below 100 %u sieve_before = /etc/dovecot/sieve/filter.sieve sieve_global_extensions = +vnd.dovecot.pipe sieve_pipe_bin_dir = /etc/dovecot/sieve sieve_plugins = sieve_imapsieve sieve_extprograms } protocols = imap pop3 sieve service auth-worker { unix_listener auth-worker { group = vmail mode = 0666 user = vmail } } service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } user = root } service dict { unix_listener dict { group = vmail mode = 0660 user = vmail } user = root } service imap-login { inet_listener imap { address = 127.0.0.1 } } service managesieve-login { inet_listener sieve { port = 4190 } } service pop3-login { inet_listener pop3 { address = 127.0.0.1 } } service quota-warning { executable = script /usr/local/bin/quota-warning.sh unix_listener quota-warning { group = vmail mode = 0660 user = vmail } user = vmail } service stats { unix_listener stats-reader { group = vmail mode = 0660 user = vmail } unix_listener stats-writer { group = vmail mode = 0660 user = vmail } } ssl_cert =

BOGOMIL VASILEV For contacts, use this e-mail. My GPG key is 646F3ABF6E457336 Website: HTTPS://WWW.SMIRKY.NET/

On 2019-01-20 13:22, Stephan Bosch wrote:

Op 20/01/2019 om 10:50 schreef Bogomil Vasilev via dovecot:

...

Hello,

I have started having issues with auth-worker. Dovecot version:

0 « root » ~ # dovecot --version 2.3.4 (0ecbaf23d) 0 « root » ~ # pacman -Q dovecot dovecot 2.3.4-2

OS: Arch Linux

From /var/log/mail.log:

Jan 20 11:31:29 archy dovecot[23070]: auth-worker: Fatal: master: service(auth-worker): child 9885 killed with signal 6 (core not dumped pable to 2)

• https://dovecot.org/bugreport.html#coredumps - set /proc/sys/fs/suid_dum

From dmesg:

[42113.729398] auth[8134]: segfault at 5579d8e1c8e0 ip 00005579d8e1c8e0 sp 00007ffd44ab0df8 error 15 [42113.729406] Code: 00 00 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 02 00 00 00 00 00 00 00 20 7a af 07 e3 7f 00 00 <40> f4 b5 07 e3 7f 00 00 31 a0 00 00 00 00 00 00 e0 9f df d8 79 55

This started happening on January 18th, after I upgraded Dovecot from "2.3.4-1" to "2.3.4-2". The package was rebuilt from our package maintainer due to bumping MariaDB from 10.1.x to 10.3.x. Before that, I did not have any issues at all. However, I don't see any impact from this error too, at least not for now. I made a coredump as the error suggests and I'm pasting it here, as per the bugreport rules:

0 « root » ~ # gdb /usr/lib/dovecot/auth /home/smirky/dovecot.dump GNU gdb (GDB) 8.2.1 Copyright (C) 2018 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-pc-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/auth...(no debugging symbols found)...done. [New LWP 9549] [Thread debugging using libthread_db enabled] Using host libthread_db library "/usr/lib/libthread_db.so.1". Core was generated by `dovecot/auth -w'. Program terminated with signal SIGABRT, Aborted. #0 0x00007fe1bb8ead7f in raise () from /usr/lib/libc.so.6 (gdb) bt full #0 0x00007fe1bb8ead7f in raise () from /usr/lib/libc.so.6 No symbol table info available. #1 0x00007fe1bb8d5672 in abort () from /usr/lib/libc.so.6 No symbol table info available. #2 0x00007fe1bb92d878 in __libc_message () from /usr/lib/libc.so.6 No symbol table info available. #3 0x00007fe1bb93418a in malloc_printerr () from /usr/lib/libc.so.6 No symbol table info available. #4 0x00007fe1bb935b27 in _int_free () from /usr/lib/libc.so.6 No symbol table info available. #5 0x00007fe1bbc2bb89 in mysql_close () from /usr/lib/libmariadb.so.3 No symbol table info available. #6 0x0000563481946dac in ?? () No symbol table info available. #7 0x000056348193b8fc in db_sql_unref () No symbol table info available. #8 0x000056348193389c in userdb_deinit () No symbol table info available. #9 0x0000563481913bb9 in auths_deinit () No symbol table info available. #10 0x0000563481912664 in main () No symbol table info available. (gdb)

The way I see it, indeed it is highly-likely to be related to the MariaDB version bump, but I cannot be entirely sure if it's not a bug in Dovecot, discovered by this bump. Please let me know if you need any other info, related to my setup.

It is very hard to be sure. Dovecot could be using the MariaDB API wrong (e.g., calling mysql_close() more than once) causing it to call abort().

You should install debug symbols for Dovecot and perhaps also MariaDB to obtain a useful gdb backtrace. Now, it has no symbol table for any of the function calls.

In most cases is useful to also provide your configuration (output from dovecot -n).

Regards,

Stephan.

Hello Aki,

This patch seems to have done the trick - hopefully it works fine and doesn't mask the problem. From the patch content, I see that it's from 4th of December. Is there a reason why this hasn't made it yet into upstream? Did you come across this bug on your own and patch it temporarily?

Best regards,

BOGOMIL VASILEV For contacts, use this e-mail. My GPG key is 646F3ABF6E457336 Website: HTTPS://WWW.SMIRKY.NET/

On 2019-01-20 15:11, Aki Tuomi wrote:

Can you try if
https://github.com/dovecot/core/commit/3c5101ffdd2a8115e03ed7180d53578765dea... helps?

Aki On 20 January 2019 at 15:05 Bogomil Vasilev via dovecot < dovecot@dovecot.org> wrote:

Hello,

I rebuilt mariadb and dovecot with debug symbols. The backtrace is this:

Program terminated with signal SIGABRT, Aborted. #0 0x00007fb040e0cd7f in raise () from /usr/lib/libc.so.6 (gdb) bt full #0 0x00007fb040e0cd7f in raise () from /usr/lib/libc.so.6 No symbol table info available. #1 0x00007fb040df7672 in abort () from /usr/lib/libc.so.6 No symbol table info available. #2 0x00007fb040e4f878 in __libc_message () from /usr/lib/libc.so.6 No symbol table info available. #3 0x00007fb040e5618a in malloc_printerr () from /usr/lib/libc.so.6 No symbol table info available. #4 0x00007fb040e57b27 in _int_free () from /usr/lib/libc.so.6 No symbol table info available. #5 0x00007fb04114db89 in mysql_close (mysql=0x5592728448e0) at /usr/src/debug/mariadb-10.3.12/libmariadb/libmariadb/mariadb_lib.c:1940 p = <optimized out> #6 mysql_close (mysql=0x5592728448e0) at /usr/src/debug/mariadb-10.3.12/libmariadb/libmariadb/mariadb_lib.c:1913 p = <optimized out> #7 0x00005592724e2dac in driver_sqlpool_disconnect (_db=0x559272843be0) at driver-sqlpool.c:590 conn__foreach_end = 0x559272844090 db = 0x559272843be0 conn = 0x559272844080 #8 0x00005592724d78fc in db_sql_unref (_conn=0x55927283b5e8) at db-sql.c:128 conn = 0x559272843818 #9 0x00005592724cf89c in userdb_deinit (userdb=0x55927283b5c0) at userdb.c:191 idx = 0 __func__ = "userdb_deinit" #10 0x00005592724afbb9 in auth_deinit (auth=0x55927283b320) at auth.c:335 passdb = <optimized out> userdb = 0x55927283b4e0 passdb = <optimized out> userdb = <optimized out> #11 auths_deinit () at auth.c:433 auth__foreach_end = 0x559272842e18 auth = 0x559272842e10 #12 0x00005592724ae664 in main_deinit () at main.c:271 l = <optimized out> l = <optimized out> l_end = <optimized out> #13 main (argc=<optimized out>, argv=<optimized out>) at main.c:398 c = <optimized out> (gdb)

My dovecot -n output is this:

0 « root » /home/smirky/stuff/ABS/dovecot # dovecot -n # 2.3.4 (0ecbaf23d): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.4 (60b0f48d) # OS: Linux 5.0.0-rc2-mainline x86_64 Arch Linux # Hostname: archy dict { quotadict = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext } mail_home = /home/vmail/%d/%u mail_location = maildir:~ mail_plugins = quota 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 i ndex ihave duplicate mime foreverypart extracttext imapsieve vnd.dovecot.imapsieve namespace inbox { inbox = yes location = mailbox Drafts { auto = create special_use = \Drafts } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { auto = no special_use = \Sent } mailbox Spam { auto = subscribe special_use = \Junk } mailbox Trash { auto = subscribe special_use = \Trash } prefix = } passdb { args = /etc/dovecot/dovecot-sql.conf driver = sql } plugin { imapsieve_mailbox1_before = file:/etc/dovecot/sieve/report-spam.sieve imapsieve_mailbox1_causes = COPY imapsieve_mailbox1_name = Spam imapsieve_mailbox2_before = file:/etc/dovecot/sieve/report-ham.sieve imapsieve_mailbox2_causes = COPY imapsieve_mailbox2_from = Junk imapsieve_mailbox2_name = * quota = dict:User quota::proxy::quotadict quota_rule2 = Trash:storage=+10%% quota_warning = storage=95%% quota-warning 95 %u quota_warning2 = storage=80%% quota-warning 80 %u quota_warning3 = -storage=100%% quota-warning below 100 %u sieve_before = /etc/dovecot/sieve/filter.sieve sieve_global_extensions = +vnd.dovecot.pipe sieve_pipe_bin_dir = /etc/dovecot/sieve sieve_plugins = sieve_imapsieve sieve_extprograms } protocols = imap pop3 sieve service auth-worker { unix_listener auth-worker { group = vmail mode = 0666 user = vmail } } service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } user = root } service dict { unix_listener dict { group = vmail mode = 0660 user = vmail } user = root } service imap-login { inet_listener imap { address = 127.0.0.1 } } service managesieve-login { inet_listener sieve { port = 4190 } } service pop3-login { inet_listener pop3 { address = 127.0.0.1 } } service quota-warning { executable = script /usr/local/bin/quota-warning.sh unix_listener quota-warning { group = vmail mode = 0660 user = vmail } user = vmail } service stats { unix_listener stats-reader { group = vmail mode = 0660 user = vmail } unix_listener stats-writer { group = vmail mode = 0660 user = vmail } } ssl_cert =

---

BOGOMIL VASILEV For contacts, use this e-mail. My GPG key is 646F3ABF6E457336 Website: HTTPS://WWW.SMIRKY.NET/

On 2019-01-20 13:22, Stephan Bosch wrote:

Op 20/01/2019 om 10:50 schreef Bogomil Vasilev via dovecot:

Hello,

I have started having issues with auth-worker. Dovecot version:

0 « root » ~ # dovecot --version 2.3.4 (0ecbaf23d) 0 « root » ~ # pacman -Q dovecot dovecot 2.3.4-2

OS: Arch Linux

From /var/log/mail.log:

Jan 20 11:31:29 archy dovecot[23070]: auth-worker: Fatal: master: service(auth-worker): child 9885 killed with signal 6 (core not dumped pable to 2)

• https://dovecot.org/bugreport.html#coredumps - set /proc/sys/fs/suid_dum

From dmesg:

[42113.729398] auth[8134]: segfault at 5579d8e1c8e0 ip 00005579d8e1c8e0 sp 00007ffd44ab0df8 error 15 [42113.729406] Code: 00 00 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 02 00 00 00 00 00 00 00 20 7a af 07 e3 7f 00 00 <40> f4 b5 07 e3 7f 00 00 31 a0 00 00 00 00 00 00 e0 9f df d8 79 55

This started happening on January 18th, after I upgraded Dovecot from "2.3.4-1" to "2.3.4-2". The package was rebuilt from our package maintainer due to bumping MariaDB from 10.1.x to 10.3.x. Before that, I did not have any issues at all. However, I don't see any impact from this error too, at least not for now. I made a coredump as the error suggests and I'm pasting it here, as per the bugreport rules:

0 « root » ~ # gdb /usr/lib/dovecot/auth /home/smirky/dovecot.dump GNU gdb (GDB) 8.2.1 Copyright (C) 2018 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-pc-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/auth...(no debugging symbols found)...done. [New LWP 9549] [Thread debugging using libthread_db enabled] Using host libthread_db library "/usr/lib/libthread_db.so.1". Core was generated by `dovecot/auth -w'. Program terminated with signal SIGABRT, Aborted. #0 0x00007fe1bb8ead7f in raise () from /usr/lib/libc.so.6 (gdb) bt full #0 0x00007fe1bb8ead7f in raise () from /usr/lib/libc.so.6 No symbol table info available. #1 0x00007fe1bb8d5672 in abort () from /usr/lib/libc.so.6 No symbol table info available. #2 0x00007fe1bb92d878 in __libc_message () from /usr/lib/libc.so.6 No symbol table info available. #3 0x00007fe1bb93418a in malloc_printerr () from /usr/lib/libc.so.6 No symbol table info available. #4 0x00007fe1bb935b27 in _int_free () from /usr/lib/libc.so.6 No symbol table info available. #5 0x00007fe1bbc2bb89 in mysql_close () from /usr/lib/libmariadb.so.3 No symbol table info available. #6 0x0000563481946dac in ?? () No symbol table info available. #7 0x000056348193b8fc in db_sql_unref () No symbol table info available. #8 0x000056348193389c in userdb_deinit () No symbol table info available. #9 0x0000563481913bb9 in auths_deinit () No symbol table info available. #10 0x0000563481912664 in main () No symbol table info available. (gdb)

The way I see it, indeed it is highly-likely to be related to the MariaDB version bump, but I cannot be entirely sure if it's not a bug in Dovecot, discovered by this bump. Please let me know if you need any other info, related to my setup. It is very hard to be sure. Dovecot could be using the MariaDB API wrong (e.g., calling mysql_close() more than once) causing it to call abort().

You should install debug symbols for Dovecot and perhaps also MariaDB to obtain a useful gdb backtrace. Now, it has no symbol table for any of the function calls.

In most cases is useful to also provide your configuration (output from dovecot -n).

Regards,

Stephan.

Aki Tuomi

Hello Stephan,

Great, that's fine. However, I don't see how your link is related to my issue. Anyway, the patch works. Hope it makes it to upstream soon.

Best regards,

BOGOMIL VASILEV For contacts, use this e-mail. My GPG key is 646F3ABF6E457336 Website: HTTPS://WWW.SMIRKY.NET/

On 2019-01-20 19:07, Stephan Bosch wrote:

Op 20/01/2019 om 15:30 schreef Bogomil Vasilev via dovecot:

...

Hello Aki,

This patch seems to have done the trick - hopefully it works fine and doesn't mask the problem. From the patch content, I see that it's from 4th of December. Is there a reason why this hasn't made it yet into upstream?

It is still being tested in QA (other stuff came first). It is internally tracked as DOV-2826, which merged to master.

...

Did you come across this bug on your own and patch it temporarily?

Bug was seen earlier here: https://www.dovecot.org/pipermail/dovecot/2018-November/113627.html

Regards,

Stephan.

Best regards,

---

BOGOMIL VASILEV For contacts, use this e-mail. My GPG key is 646F3ABF6E457336 Website: HTTPS://WWW.SMIRKY.NET/

On 2019-01-20 15:11, Aki Tuomi wrote:

Can you try if https://github.com/dovecot/core/commit/3c5101ffdd2a8115e03ed7180d53578765dea... helps?

Aki On 20 January 2019 at 15:05 Bogomil Vasilev via dovecot < dovecot@dovecot.org> wrote:

Hello,

I rebuilt mariadb and dovecot with debug symbols. The backtrace is this:

Program terminated with signal SIGABRT, Aborted. #0 0x00007fb040e0cd7f in raise () from /usr/lib/libc.so.6 (gdb) bt full #0 0x00007fb040e0cd7f in raise () from /usr/lib/libc.so.6 No symbol table info available. #1 0x00007fb040df7672 in abort () from /usr/lib/libc.so.6 No symbol table info available. #2 0x00007fb040e4f878 in __libc_message () from /usr/lib/libc.so.6 No symbol table info available. #3 0x00007fb040e5618a in malloc_printerr () from /usr/lib/libc.so.6 No symbol table info available. #4 0x00007fb040e57b27 in _int_free () from /usr/lib/libc.so.6 No symbol table info available. #5 0x00007fb04114db89 in mysql_close (mysql=0x5592728448e0) at /usr/src/debug/mariadb-10.3.12/libmariadb/libmariadb/mariadb_lib.c:1940 p = <optimized out> #6 mysql_close (mysql=0x5592728448e0) at /usr/src/debug/mariadb-10.3.12/libmariadb/libmariadb/mariadb_lib.c:1913 p = <optimized out> #7 0x00005592724e2dac in driver_sqlpool_disconnect (_db=0x559272843be0) at driver-sqlpool.c:590 conn__foreach_end = 0x559272844090 db = 0x559272843be0 conn = 0x559272844080 #8 0x00005592724d78fc in db_sql_unref (_conn=0x55927283b5e8) at db-sql.c:128 conn = 0x559272843818 #9 0x00005592724cf89c in userdb_deinit (userdb=0x55927283b5c0) at userdb.c:191 idx = 0 __func__ = "userdb_deinit" #10 0x00005592724afbb9 in auth_deinit (auth=0x55927283b320) at auth.c:335 passdb = <optimized out> userdb = 0x55927283b4e0 passdb = <optimized out> userdb = <optimized out> #11 auths_deinit () at auth.c:433 auth__foreach_end = 0x559272842e18 auth = 0x559272842e10 #12 0x00005592724ae664 in main_deinit () at main.c:271 l = <optimized out> l = <optimized out> l_end = <optimized out> #13 main (argc=<optimized out>, argv=<optimized out>) at main.c:398 c = <optimized out> (gdb)

My dovecot -n output is this:

0 « root » /home/smirky/stuff/ABS/dovecot # dovecot -n # 2.3.4 (0ecbaf23d): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.4 (60b0f48d) # OS: Linux 5.0.0-rc2-mainline x86_64 Arch Linux # Hostname: archy dict { quotadict = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext } mail_home = /home/vmail/%d/%u mail_location = maildir:~ mail_plugins = quota 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 i ndex ihave duplicate mime foreverypart extracttext imapsieve vnd.dovecot.imapsieve namespace inbox { inbox = yes location = mailbox Drafts { auto = create special_use = \Drafts } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { auto = no special_use = \Sent } mailbox Spam { auto = subscribe special_use = \Junk } mailbox Trash { auto = subscribe special_use = \Trash } prefix = } passdb { args = /etc/dovecot/dovecot-sql.conf driver = sql } plugin { imapsieve_mailbox1_before = file:/etc/dovecot/sieve/report-spam.sieve imapsieve_mailbox1_causes = COPY imapsieve_mailbox1_name = Spam imapsieve_mailbox2_before = file:/etc/dovecot/sieve/report-ham.sieve imapsieve_mailbox2_causes = COPY imapsieve_mailbox2_from = Junk imapsieve_mailbox2_name = * quota = dict:User quota::proxy::quotadict quota_rule2 = Trash:storage=+10%% quota_warning = storage=95%% quota-warning 95 %u quota_warning2 = storage=80%% quota-warning 80 %u quota_warning3 = -storage=100%% quota-warning below 100 %u sieve_before = /etc/dovecot/sieve/filter.sieve sieve_global_extensions = +vnd.dovecot.pipe sieve_pipe_bin_dir = /etc/dovecot/sieve sieve_plugins = sieve_imapsieve sieve_extprograms } protocols = imap pop3 sieve service auth-worker { unix_listener auth-worker { group = vmail mode = 0666 user = vmail } } service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } user = root } service dict { unix_listener dict { group = vmail mode = 0660 user = vmail } user = root } service imap-login { inet_listener imap { address = 127.0.0.1 } } service managesieve-login { inet_listener sieve { port = 4190 } } service pop3-login { inet_listener pop3 { address = 127.0.0.1 } } service quota-warning { executable = script /usr/local/bin/quota-warning.sh unix_listener quota-warning { group = vmail mode = 0660 user = vmail } user = vmail } service stats { unix_listener stats-reader { group = vmail mode = 0660 user = vmail } unix_listener stats-writer { group = vmail mode = 0660 user = vmail } } ssl_cert =

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BOGOMIL VASILEV For contacts, use this e-mail. My GPG key is 646F3ABF6E457336 Website: HTTPS://WWW.SMIRKY.NET/

On 2019-01-20 13:22, Stephan Bosch wrote:

Op 20/01/2019 om 10:50 schreef Bogomil Vasilev via dovecot:

Hello,

I have started having issues with auth-worker. Dovecot version:

0 « root » ~ # dovecot --version 2.3.4 (0ecbaf23d) 0 « root » ~ # pacman -Q dovecot dovecot 2.3.4-2

OS: Arch Linux

From /var/log/mail.log:

Jan 20 11:31:29 archy dovecot[23070]: auth-worker: Fatal: master: service(auth-worker): child 9885 killed with signal 6 (core not dumped pable to 2)

• https://dovecot.org/bugreport.html#coredumps - set /proc/sys/fs/suid_dum

From dmesg:

[42113.729398] auth[8134]: segfault at 5579d8e1c8e0 ip 00005579d8e1c8e0 sp 00007ffd44ab0df8 error 15 [42113.729406] Code: 00 00 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 02 00 00 00 00 00 00 00 20 7a af 07 e3 7f 00 00 <40> f4 b5 07 e3 7f 00 00 31 a0 00 00 00 00 00 00 e0 9f df d8 79 55

This started happening on January 18th, after I upgraded Dovecot from "2.3.4-1" to "2.3.4-2". The package was rebuilt from our package maintainer due to bumping MariaDB from 10.1.x to 10.3.x. Before that, I did not have any issues at all. However, I don't see any impact from this error too, at least not for now. I made a coredump as the error suggests and I'm pasting it here, as per the bugreport rules:

0 « root » ~ # gdb /usr/lib/dovecot/auth /home/smirky/dovecot.dump GNU gdb (GDB) 8.2.1 Copyright (C) 2018 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-pc-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/auth...(no debugging symbols found)...done. [New LWP 9549] [Thread debugging using libthread_db enabled] Using host libthread_db library "/usr/lib/libthread_db.so.1". Core was generated by `dovecot/auth -w'. Program terminated with signal SIGABRT, Aborted. #0 0x00007fe1bb8ead7f in raise () from /usr/lib/libc.so.6 (gdb) bt full #0 0x00007fe1bb8ead7f in raise () from /usr/lib/libc.so.6 No symbol table info available. #1 0x00007fe1bb8d5672 in abort () from /usr/lib/libc.so.6 No symbol table info available. #2 0x00007fe1bb92d878 in __libc_message () from /usr/lib/libc.so.6 No symbol table info available. #3 0x00007fe1bb93418a in malloc_printerr () from /usr/lib/libc.so.6 No symbol table info available. #4 0x00007fe1bb935b27 in _int_free () from /usr/lib/libc.so.6 No symbol table info available. #5 0x00007fe1bbc2bb89 in mysql_close () from /usr/lib/libmariadb.so.3 No symbol table info available. #6 0x0000563481946dac in ?? () No symbol table info available. #7 0x000056348193b8fc in db_sql_unref () No symbol table info available. #8 0x000056348193389c in userdb_deinit () No symbol table info available. #9 0x0000563481913bb9 in auths_deinit () No symbol table info available. #10 0x0000563481912664 in main () No symbol table info available. (gdb)

The way I see it, indeed it is highly-likely to be related to the MariaDB version bump, but I cannot be entirely sure if it's not a bug in Dovecot, discovered by this bump. Please let me know if you need any other info, related to my setup. It is very hard to be sure. Dovecot could be using the MariaDB API wrong (e.g., calling mysql_close() more than once) causing it to call abort().

You should install debug symbols for Dovecot and perhaps also MariaDB to obtain a useful gdb backtrace. Now, it has no symbol table for any of the function calls.

In most cases is useful to also provide your configuration (output from dovecot -n).

Regards,

Stephan.

Aki Tuomi