dovecot - Apr 2009 - Panic: file mempool-system.c: line 104

Hello!

I have used Dovecot for more than a year without problems, but today it
just crashed with this message:

dovecot: Apr 09 21:23:38 Panic: file mempool-system.c: line 104
(pool_system_realloc): assertion failed: (old_size == (size_t)-1 || mem
== NULL || old_size <= malloc_usable_size(mem))
dovecot: Apr 09 21:23:38 Error: Raw backtrace: /usr/local/sbin/dovecot
[0x805757c] -> /usr/local/sbin/dovecot [0x8057664] ->
/usr/local/sbin/dovecot [0x80514e9] -> /usr/local/sbin/dovecot
[0x8056edb] -> /usr/local/sbin/dovecot [0x805bcc1] ->
/usr/local/sbin/dovecot [0x8055bbf] -> /usr/local/sbin/dovecot
[0x8055d3b] -> /usr/local/sbin/dovecot [0x8055d87] ->
/usr/local/sbin/dovecot [0x8062448] -> /usr/local/sbin/dovecot
[0x805aadf] -> /usr/local/sbin/dovecot [0x805a5a7] ->
/usr/local/sbin/dovecot [0x804d63a] -> /usr/local/sbin/dovecot
[0x804da67] -> /usr/local/sbin/dovecot [0x804e4ce] ->
/usr/local/sbin/dovecot [0x805a17a] -> /usr/local/sbin/dovecot
[0x805adac] -> /usr/local/sbin/dovecot [0x8059f89] ->
/usr/local/sbin/dovecot [0x8051b43] ->
/lib/libc.so.6(__libc_start_main+0xd8) [0xb7e49df8] ->
/usr/local/sbin/dovecot [0x804a451]

dovecot --version
1.1.7

It seems, than some brute force attack caused this, here some more
log:
> dovecot: Apr 09 21:23:36 Info: auth(default): client out: FAIL  1      
user=jennie
> dovecot: Apr 09 21:23:36 Info: auth(default): client out: FAIL  1      
user=jeffrey
> dovecot: Apr 09 21:23:36 Info: auth(default): client out: FAIL  1      
user=job
> dovecot: Apr 09 21:23:36 Info: auth-worker(default):
sql(jimmy,81.149.214.201): query: SELECT password FROM mailbox WHERE username =
'jimmy' AND active = '1'
> dovecot: Apr 09 21:23:36 Info: auth(default): client in: AUTH   1      
PLAIN   service=pop3    lip=195.3.144.29        rip=81.149.214.201     
lport=110       rport=34646     resp=<hidden>
> dovecot: Apr 09 21:23:36 Info: auth-worker(default):
sql(jimmy,81.149.214.201): unknown user
For now I blocked this one IP (81.149.214.201), but wondering if this
could happen again in the future?

Don`t really understand what`s the problem. I have ~2Gb of memory free,
so it can not be a out of memory issue.

Any ideas?

Thank you!

-- 
Martins Lazdans

On Thu, 2009-04-09 at 21:37 +0300, Martins Lazdans
wrote:
> Hello!
> 
> I have used Dovecot for more than a year without problems, but today it
> just crashed with this message:
> 
> dovecot: Apr 09 21:23:38 Panic: file mempool-system.c: line 104
> (pool_system_realloc): assertion failed: (old_size == (size_t)-1 || mem
> == NULL || old_size <= malloc_usable_size(mem))
Did Dovecot happen to write a core file somewhere? Should be in base_dir
(e.g. /var/run/dovecot)? A gdb backtrace would be helpful.

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No, there is no core dumps. I believe I can somehow enable to dump core?

Timo Sirainen wrote:
> On Thu, 2009-04-09 at 21:37 +0300, Martins Lazdans wrote:
>> Hello!
>>
>> I have used Dovecot for more than a year without problems, but today it
>> just crashed with this message:
>>
>> dovecot: Apr 09 21:23:38 Panic: file mempool-system.c: line 104
>> (pool_system_realloc): assertion failed: (old_size == (size_t)-1 || mem
>> == NULL || old_size <= malloc_usable_size(mem))
> 
> Did Dovecot happen to write a core file somewhere? Should be in base_dir
> (e.g. /var/run/dovecot)? A gdb backtrace would be helpful.
> 
-- 
Martins Lazdans