答复: 答复: 100% cpu usage on CentOS/RHEL 6

[谢良]

If so, it's unlikely a leap-second issue.  You can figure it out by `dmesg`,  the leap-second worked while sth like "Clock: inserting leap second 23:59:60 UTC" be found and ntpd service running:)
________________________________
发件人: Amol Kulkarni [amolk112k at gmail.com]
发送时间: 2012年7月3日 21:54
到: 谢良
Cc: Mark Thornton; discuss at openjdk.java.net
主题: Re: 答复: 100% cpu usage on CentOS/RHEL 6

Seems like I've hit the leap second bug itself. But since I'm getting that error for atleast 15 days now i.e from 15 June or so. Is it likely that the leap second bug occurs before the leap second is introduced by the kernel?

On Tue, Jul 3, 2012 at 4:54 PM, 谢良 <xieliang at xiaomi.com<mailto:xieliang at xiaomi.com>> wrote:
May be you can have an eye on here :  https://lkml.org/lkml/2012/7/1/27  :)
________________________________________
发件人: discuss-bounces at openjdk.java.net<mailto:discuss-bounces at openjdk.java.net> [discuss-bounces at openjdk.java.net<mailto:discuss-bounces at openjdk.java.net>] 代表 Amol Kulkarni [amolk112k at gmail.com<mailto:amolk112k at gmail.com>]
发送时间: 2012年7月3日 19:02
到: Mark Thornton
Cc: discuss at openjdk.java.net<mailto:discuss at openjdk.java.net>
主题: Re: 100% cpu usage on CentOS/RHEL 6

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<mailto: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
>
>