100% cpu usage on CentOS/RHEL 6

[Amol Kulkarni]

Hi,

>From the symptoms, it looks like the same bug to me too.
I'll check whether it is solved in CentOS/RHEL 6 kernels.




On Mon, Jul 2, 2012 at 7:32 PM, Mark Thornton <mthornton at optrak.com> wrote:

>  On 02/07/12 14:45, Amol Kulkarni wrote:
>
> Hi,
>
> I have a java app running on CentOS 6.0. It always runs in background via
> cron. Sometimes this app goes into wait state while using 100% cpu.
>
> My java version is :
>
>     java version "1.6.0_17"
>     OpenJDK Runtime Environment (IcedTea6 1.7.4) (rhel-1.21.b17.el6-x86_64)
>     OpenJDK 64-Bit Server VM (build 14.0-b16, mixed mode)
>
> Other symptoms are :
>
> a. One thread of the process seems to be in a loop waiting for something.
> When traced using strace, it shows following o/p continuously :
>
>
>      futex(0x7fb8000ac728, FUTEX_WAKE_PRIVATE, 1) = 0
>     futex(0x7fb8000ac754, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME,
>
>
> Could it be related to this:
> https://bugzilla.kernel.org/show_bug.cgi?id=32922
>
> Mark Thornton
>
>