seeing some "Bad page state in process.." msgs....

seeing some "Bad page state in process.." msgs....

[Gautam Thaker]

I am running 2.6.26.6-rt11-1.2944.fc6.emulab-highmem #1 SMP PREEMPT RT

My test pgm is a java pgm that has about 650 threads in it (i am doing some stress testing). This test runs w/o any 
kernel messages when run on vanilla 2.6.25 kernel. But w/ the above RT kernel I see some kernel msgs that I do not 
understand.

ANy hints?

root@node0>  time java -classpath .:../../../utils/hist Test1 500 10001 1 > out.500_senders_RT

Message from syslogd@node0 at Mon Nov 10 18:54:14 2008 ...
node0 kernel: Bad page state in process 'java'

Message from syslogd@node0 at Mon Nov 10 18:54:14 2008 ...
node0 kernel: page:c8a690b8 flags:0x80000000 mapping:c8a690c8 mapcount:0 count:0

Message from syslogd@node0 at Mon Nov 10 18:54:14 2008 ...

Message from syslogd@node0 at Mon Nov 10 18:54:14 2008 ...
node0 kernel: Trying to fix it up, but a reboot is needednode0
  kernel: Backtrace:

<MY ADDED NOTE: NO Backtrace is produced.>

root@node0> uname -a
Linux node0.onepc2950rtnode.atlqos.emulab.atl.lmco.com 2.6.26.6-rt11-1.2944.fc6.emulab-highmem #1 SMP PREEMPT RT Sat Nov 
8 20:10:03MST 2008 i686 i686 i386 GNU/Linux
root@node0>

Re: seeing some "Bad page state in process.." msgs....

[Robert Hancock]

Gautam Thaker wrote:
> I am running 2.6.26.6-rt11-1.2944.fc6.emulab-highmem #1 SMP PREEMPT RT
> 
> My test pgm is a java pgm that has about 650 threads in it (i am doing 
> some stress testing). This test runs w/o any kernel messages when run on 
> vanilla 2.6.25 kernel. But w/ the above RT kernel I see some kernel msgs 
> that I do not understand.
> 
> ANy hints?
> 
> root@node0>  time java -classpath .:../../../utils/hist Test1 500 10001 
> 1 > out.500_senders_RT
> 
> Message from syslogd@node0 at Mon Nov 10 18:54:14 2008 ...
> node0 kernel: Bad page state in process 'java'
> 
> Message from syslogd@node0 at Mon Nov 10 18:54:14 2008 ...
> node0 kernel: page:c8a690b8 flags:0x80000000 mapping:c8a690c8 mapcount:0 
> count:0
> 
> Message from syslogd@node0 at Mon Nov 10 18:54:14 2008 ...
> 
> Message from syslogd@node0 at Mon Nov 10 18:54:14 2008 ...
> node0 kernel: Trying to fix it up, but a reboot is needednode0
>  kernel: Backtrace:
> 
> <MY ADDED NOTE: NO Backtrace is produced.>

You should be able to get this from dmesg, or from /var/log/messages if 
you rebooted already..

> 
> root@node0> uname -a
> Linux node0.onepc2950rtnode.atlqos.emulab.atl.lmco.com 
> 2.6.26.6-rt11-1.2944.fc6.emulab-highmem #1 SMP PREEMPT RT Sat Nov 8 
> 20:10:03MST 2008 i686 i686 i386 GNU/Linux
> root@node0>
>