[Samba] Many "smbd" process with "D" uninterruptible sleep status

[Stéphane PURNELLE]

Monday I got the same problem but in other situation.

We have 2 physical server (node1 et node2) and a software Lifekeeper 
(software doing HA, network raid and failover)

Monday : node2 crash
Lifekeeper do a auto-failover and all service start on node1
but node1 take high loading for unknow reason and samba not responding 
correctly.
And I see the same case than you, many smbd process in state D.

solution : hardware reset of server.

I'm afraid because we plan to replace these servers by new servers with 
samba 4 with same configuration.
I don't know if this issue is due to number of client who try to reconnect 
or other thing.

best regards

        Stéphane

-----------------------------------
Stéphane PURNELLE                         Admin. Systèmes et Réseaux 
Service Informatique       Corman S.A.           Tel : 00 32 (0)87/342467

samba-bounces at lists.samba.org wrote on 17/10/2013 09:06:22:

> De : Simon Wang <simonnn.wang at gmail.com>
> A : samba at lists.samba.org, 
> Date : 17/10/2013 09:06
> Objet : [Samba] Many "smbd" process with "D" uninterruptible sleep 
status
> Envoyé par : samba-bounces at lists.samba.org
> 
> I got a samba server(Linux) to store some data in my PC(windows)
> frequently.  And last night I found that samba can't work. After logined 
to
> samba server and found that there's 91 smbd processes with status "D"
> totally.
> # ps
>     169 root         0        SW   [pdflush]
>     170 root         0        DW   [pdflush]
> ....
> 29534 simon  20608 D    /sbin/smbd -D
> 29548 root       2792 D    /bin/sync
> 30160 simon  20608 D    /sbin/smbd -D
> 30474 simon  20608 D    /sbin/smbd -D
> 30496 simon  18676 D    /sbin/smbd -D
> 30673 simon  20504 D    /sbin/smbd -D
> 30810 simon  20504 D    /sbin/smbd -D
> 31302 simon  20608 D    /sbin/smbd -D
> 31965 simon  20608 D    /sbin/smbd -D
> 32288 simon  20608 D    /sbin/smbd -D
> ...
> And after 5 mins the result of "ps" is the same.
> 
> The result of "top" shows below. The load average is VERY HIGHT and CPU 
is
> busy for io.
> # top
> Mem: 366504K used, 143900K free, 0K shrd, 14216K buff, 293224K cached
> CPU:  1.7% usr  3.5% sys  0.0% nic  0.0% idle 92.9% io  1.7% irq  0.0% 
sirq
> Load average: 103.10 103.03 102.65 1/149 5614
> PID  PPID USER     STAT   VSZ %MEM %CPU COMMAND
>  5532  3325 root     R     3000  0.5  3.5 top
>  2421     1 simon  D    20712  4.0  0.0 /sbin/smbd -D
>   594     1 simon  D    20712  4.0  0.0 /sbin/smbd -D
>  4130     1 simon  D    20712  4.0  0.0 /sbin/smbd -D
>  1261     1 simon  D    20608  4.0  0.0 /sbin/smbd -D
> 23452     1 simon  D    20608  4.0  0.0 /sbin/smbd -D
> 30474     1 simon  D    20608  4.0  0.0 /sbin/smbd -D
> 21641     1 simon  D    20608  4.0  0.0 /sbin/smbd -D
>  9053     1 simon  D    20608  4.0  0.0 /sbin/smbd -D
>  3068     1 simon  D    20608  4.0  0.0 /sbin/smbd -D
> 
> After reboot, the samba works fine. Until now I cannot reproduce yet.
> I can't figure out what's going on.
> Is it kind of bugs in kernel or samba?
> Does pdflush crash first, then affect smbd and sync to crash?
> 
> Please help,
> Thanks very much.
> 
> 
> I used some options in smb.conf:
>   max smbd process = 100
>   max connections = 100
> 
> Linux Samba Server:
>   Linux 2.6.31.8
>   Samba 3.5.6
>   Software RAID 1
> 
> 
> Simon
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