Re: 2.6.28-rc1: EIP: slab_destroy+0x84/0x142

[Alexey Dobriyan <adobriyan@gmail.com>]

On Sat, Oct 25, 2008 at 04:24:06AM +0400, Alexey Dobriyan wrote:
> On Fri, Oct 24, 2008 at 06:29:47PM -0500, Christoph Lameter wrote:
> > On Sat, 25 Oct 2008, Alexey Dobriyan wrote:
> >
> >> Fault occured at slab_destroy in KVM guest kernel.
> >
> > Please switch on all SLAB debug options and rerun.
> 
> They're already on!
> 
> New knowledge: turning off just DEBUG_PAGEALLOC makes oops dissapear,
> other debugging options don't matter.

Here is typical scenario:
cache -- filp or dentry, ->buffer_size = 4096, objp = c643d000, dbg_redzone1 = c643df78.

Unable to handle ... at c643df7c. which is not next page.

Using -no-kvm switch makes this oops go away, there are strange but rare
other things like half of initscripts processes decides to segfault.
Dunno what is this.

Same picture for different guest kernels: 2.6.26, 2.6.27, 2.6.28-rc1
and different host kernels: 2.6.26-1-686 from to be Debian Lenny, 2.6.27.3
and 2.6.28-rc1.

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