[Samba] too many open files

[Stefan Schäfer]

Am 15.04.2014 11:36, schrieb David Disseldorp:
> On Tue, 15 Apr 2014 10:17:03 +0200, Stefan Schäfer wrote:
>
>> The logfile says:
>>
>> "Apr 15 02:48:37 s4ad samba[3058]: [2014/04/15 02:48:37.495691,  0]
>> ../source4/smbd/process_single.c:57(single_accept_conn
>> ection)
>> Apr 15 02:48:37 s4ad samba[3058]: [2014/04/15 02:48:37.495905,  0]
>> ../lib/util/debug.c:595(reopen_logs_internal)
>> Apr 15 02:48:37 s4ad samba[3058]:   Unable to open new log file
>> '/var/log/samba/log.samba': Too many open files
>> Apr 15 02:48:37 s4ad samba[3058]:   single_accept_connection: accept:
>> NT_STATUS_TOO_MANY_OPENED_FILES
>> Apr 15 02:48:38 s4ad samba[3058]: [2014/04/15 02:48:38.496541,  0]
>> ../source4/smbd/process_single.c:57(single_accept_conn
>> ection)"
>>
>> The last two message repeats many times until reboot.
>>
>> It happens just when samba tries to open a new connection to its logfile.
>>
>> Any ideas? Further information needed?
> Looks like you've hit EMFILE. I'd suggest checking the list of fd's used
> by the process with "ls -l /proc/$pid/fd". That should help you
> determine whether the error is due to an fd leak somewhere.
>
> "cat /proc/$pid/limits" will also show you the "Max open files" limits
> for the process, which you may wish to raise.
>
> Cheers, David
Hello,

I found out, that it's one of the samba (not smbd) processes which cause 
the problem.

During normal behavior all samba processes have between 23 and 59 open 
fd's. The one with the most open fd's has a lot  of open sockets.

The limit is set to 1024:

cat /proc/3070/limits |grep files
Max open files            1024                 8192 files

My customer allways rebooted the system if the problem happens. This 
(very early) morning i had a look at the system before anyone could 
reboot it. There was a lot of "to many open file" entries in the log and 
there was one samba process who had 1025 open fd's most of them sockets.

I just restart the samba daemon and the problem was gone. After restart 
I had a look to the limits an now it says:

cat /proc/16041/limits |grep files
Max open files            16384                16384 files

After rebooting the whole machine the limit is 1024 and after restarting 
samba it is raised to 16384. Is this normal?

At first I thought that the problem comes more and more often, but it 
seems that with a limit of 1024 it happens every night and with a limit 
of 16384 it happens round about every two month, but allways over night.

Is there any chance to find out wether this is a samba bug or caused by 
an external problem?

Regards

Stefan

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