[Samba] SMBD using nearly 100 percent CPU

[Ryan Steele]

Andy,

Luckily, the client this was happening to's contract ran out.  I haven't 
had the problem with any other clients, but I suspect it had something 
to do with the kernel it was running on...that was the only thing that 
differed between the boxes that did and didn't work.  (It was an older 
kernel...2.6.5 or something)  I never had a chance to ultimately 
determine the root cause...but my advice would be to attach an strace to 
the process(es) that is/are spinning out of control and see what it's 
hanging on.  In the online book Samba3 By Example (Google that) it has a 
chapter on stracing smbd processes.  Hope that helps.

Best,
Ryan

andy liebman wrote:
> Over the past few months, I have seen many postings here about runaway 
> smbd processes with Samba versions 3.0.20 and above. Personally, it 
> never happened to me until today. Also, I have stuck with Samba 3.0.13 
> on most of my machines because of THIS reported issue and a couple of 
> other issues that I have experienced.
>
> However, I have a machine running RIGHT NOW where smbd has gone out of 
> control. This machine is running 3.0.20b. If it would help, and if 
> somebody could tell me exactly -- and I mean exactly -- what to do on 
> my machine to capture information that might help explain what is 
> going on, I would be happy to collect the information.
>
> But, it has to be in the next couple of hours. It is 8:30 am Friday in 
> Boston, MA USA. I have to reboot the machine to use it in about 3 hours.
>
> Note that rpc.statd also seems to be out of control. Don't know if it 
> is related.
>
> Andy Liebman
>
> Here's what TOP looks like:
>
> Tasks: 170 total,   2 running, 168 sleeping,   0 stopped,   0 zombie
> Cpu(s): 12.6% us, 34.1% sy,  0.0% ni, 20.3% id,  0.0% wa,  0.0% hi, 
> 33.1% si
> Mem:   2075844k total,  2019784k used,    56060k free,     7668k buffers
> Swap:  1012052k total,     2556k used,  1009496k free,  1820308k cached
>
>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>  4743 root      25   0  8664 2164 1416 R 99.7  0.1 621:48.83 smbd
>  2569 root      15   0  1692  688  584 S 58.8  0.0 323:00.52 rpc.statd
>  4928 andrew    15   0 13604  11m 1592 S  0.7  0.6   0:10.55 Xvnc
> 11509 andrew    16   0 27520  12m   9m S  0.3  0.6   0:01.64 konsole
>     1 root      16   0  1560  536  472 S  0.0  0.0   0:00.70 init
>     2 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 migration/0
>     3 root      34  19     0    0    0 S  0.0  0.0   0:00.00 ksoftirqd/0
>     4 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 migration/1
>     5 root      34  19     0    0    0 S  0.0  0.0   0:00.00 ksoftirqd/1
>     6 root      10  -5     0    0    0 S  0.0  0.0   0:00.09 events/0
>     7 root      10  -5     0    0    0 S  0.0  0.0   0:05.15 events/1
>     8 root      11  -5     0    0    0 S  0.0  0.0   0:00.01 khelper
>     9 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 kthread
>    12 root      20  -5     0    0    0 S  0.0  0.0   0:00.00 kacpid
>   124 root      10  -5     0    0    0 S  0.0  0.0   0:00.05 kblockd/0
>   125 root      10  -5     0    0    0 S  0.0  0.0   0:00.05 kblockd/1
>   167 root      15   0     0    0    0 S  0.0  0.0   3:42.50 pdflush