F15: named using 90+% cpu

[John Wendel]

On 01/07/2012 03:26 PM, sean darcy wrote:
> On 01/07/2012 06:07 PM, John Wendel wrote:
>> On 01/07/2012 10:28 AM, sean darcy wrote:
>>> I've a recursive nameserver under no load taking 90% or more of the
>>> cpu. I've restarted, no joy.
>>>
>>> There's an rsync task in the background, but nothing else.
>>>
>>> What's going on?
>>>
>>> sean
>>>
>>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
>>> 12766 named 20 0 237m 27m 2732 S 90.7 2.8 1352:27 named
>>>
>>>
>>> [snip]
>>
>> strace -p <PID>, might give you a clue.
>>
>> John
>>
>>
>
> Here's strace. Left it running for about a minute. What could this mean?
>
> strace  -p 12766
> Process 12766 attached - interrupt to quit
> rt_sigsuspend([]^C <unfinished ...>
> Process 12766 detached
>
> sean
>
Since it isn't making any system calls (which would show up in strace), 
it must be in a tight loop in the code. Time to attach a debugger, but 
to get anything meaningful, you would need to be running a version of 
the program compiled with debugging enabled.  Maybe someone smarter than 
me can offer some more useful advice.

Regards,

John