Crash when using dict quotas with sqlite database

[Marcel Menzel]

Hello John,

I tried (until now) to get a valuable backtrace, but it seems that GDB
can't resolve all symbols.
This is what systemd-coredump is giving me:

Stack trace of thread 22359:
#0  0x0000638167eaf062 event_unref (libdovecot.so.0)
#1  0x000004a58a212151 n/a (dict)
#2  0x000004a58a211333 n/a (dict)
#3  0x000004a58a20514d n/a (dict)
#4  0x0000638167e556f2 dict_transaction_begin (libdovecot.so.0)
#5  0x000004a58a203b06 n/a (dict)
#6  0x000004a58a2045ff dict_command_input (dict)
#7  0x000004a58a202a31 n/a (dict)
#8  0x000004a58a202b35 n/a (dict)
#9  0x0000638167eaacfd io_loop_call_io (libdovecot.so.0)
#10 0x0000638167eac635 io_loop_handler_run_internal (libdovecot.so.0)
#11 0x0000638167eaadc7 io_loop_handler_run (libdovecot.so.0)
#12 0x0000638167eaaf68 io_loop_run (libdovecot.so.0)
#13 0x0000638167e1b36a master_service_run (libdovecot.so.0)
#14 0x000004a58a202300 main (dict)
#15 0x0000638167a17223 __libc_start_main (libc.so.6)
#16 0x000004a58a2023fe _start (dict)

GDB's "bt full" won't give anything more here, I might compile Dovecot
with debug symbols enabled as soon as I have a little more time:

(gdb) bt full
#0  0x0000638167eaf062 in event_unref () from
/usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#1  0x000004a58a212151 in ?? ()
No symbol table info available.
#2  0x000004a58a211333 in ?? ()
No symbol table info available.
#3  0x000004a58a20514d in ?? ()
No symbol table info available.
#4  0x0000638167e556f2 in dict_transaction_begin () from
/usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#5  0x000004a58a203b06 in ?? ()
No symbol table info available.
#6  0x000004a58a2045ff in dict_command_input ()
No symbol table info available.
#7  0x000004a58a202a31 in ?? ()
No symbol table info available.
#8  0x000004a58a202b35 in ?? ()
No symbol table info available.
#9  0x0000638167eaacfd in io_loop_call_io () from
/usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#10 0x0000638167eac635 in io_loop_handler_run_internal () from
/usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#11 0x0000638167eaadc7 in io_loop_handler_run () from
/usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#12 0x0000638167eaaf68 in io_loop_run () from
/usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#13 0x0000638167e1b36a in master_service_run () from
/usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#14 0x000004a58a202300 in main ()
No symbol table info available.

- Marcel

Am 03.02.2019 um 09:08 schrieb John Fawcett:
> On 01/02/2019 20:40, Marcel Menzel wrote:
>> Hello,
>>
>>
>> After I configured a SQLite backed dict quota backend, the dict process
>> crashes every time a quota operation is happening.
>>
>> SQLite: 3.26.0
>>
>> Dovecot: 2.3.4 (0ecbaf23d)
>>
>> Linux: 4.20.4.a-1-hardened #1 SMP PREEMPT Fri Jan 25 01:24:51 CET 2019
>> x86_64 GNU/Linux (Arch Linux)
>>
>> Filesystem: BTRFS
>>
>>
>> I can't get any debug output from Dovecot, even after setting log_debug
>> = cat:* event:* source:* field:*=*
>>
>> dovecot[6457]: dict(6687): Debug: sqlite: Finished query 'BEGIN
>> TRANSACTION' in 0 msecs
>> dovecot[6457]: dict(6687): Fatal: master: service(dict): child 6687
>> killed with signal 11 (core dumped)
>>
>>
>> I've attached the output of dovecot -n and the coredump file from
>> systemd-coredump.
>>
>>
>> Kind regards,
>>
>> Marcel Menzel
>>
> Any chance of posting a backtrace?
>
> John
>