Re: [ANNOUNCE] kvm-55 release

[Izik Eidus <izike-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Haydn Solomon wrote:
>
>
> Some output from guest hanging.
>
> Message from syslogd@ at Wed Dec  5 06:41:08 2007 ...
> localhost kernel: Bad page state in process 'qemu-system-x86'
> Message from syslogd@ at Wed Dec  5 06:41:08 2007 ...
> localhost kernel: page:ffff8100022132a8 flags:0x0050080000000004 
> mapping:0000000000000000 mapcount:1 count:0 (Tainted: P       )
>
>
> Message from syslogd@ at Wed Dec  5 06:41:09 2007 ...
> localhost kernel: Trying to fix it up, but a reboot is needed
> Message from syslogd@ at Wed Dec  5 06:41:09 2007 ...
> localhost kernel: Backtrace:
> Message from syslogd@ at Wed Dec  5 06:42:27 2007 ...
> localhost kernel: Eeek! page_mapcount(page) went negative! (-1)
> Message from syslogd@ at Wed Dec  5 06:42:27 2007 ...
> localhost kernel:   page pfn = 529c3
> Message from syslogd@ at Wed Dec  5 06:42:27 2007 ...
> localhost kernel:   page->flags = 50080000080014
> Message from syslogd@ at Wed Dec  5 06:42:27 2007 ...
> localhost kernel:   page->count = 1
> Message from syslogd@ at Wed Dec  5 06:42:27 2007 ...
> localhost kernel:   page->mapping = 0000000000000000
> Message from syslogd@ at Wed Dec  5 06:42:27 2007 ...
> localhost kernel:   vma->vm_ops = 0x0
> Message from syslogd@ at Wed Dec  5 06:42:27 2007 ...
> localhost kernel: ------------[ cut here ]------------
> Message from syslogd@ at Wed Dec  5 06:42:27 2007 ...
>
>
this is weird, i dont understand how you get page_mapcount to be negative
(i would understand if _count would go to negative (not that i will like 
it :))

do you remember from witch version of kvm it started? (kvm-47 ???)

one more thing is that beside you i dont know anyone who get this kind 
of error,
is it ever happen to you when you dont use kvm?
is your guest image is something special?, can i some how do anything 
that will give me the same result on my host?

at lkml Dave Jones say that many of thease can be hardware problem (i 
would count more that it is kvm bug, but maybe it is worth trying memtest)
http://lkml.org/lkml/2007/10/16/295

but one big hint for me will be if you will be able to tell if the 
problem start right after kvm-47 and never before it.

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