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SubjectRe: Early boot panic on machine with lots of memory
On Thu, Jun 14, 2012 at 11:50:40AM +0200, Sasha Levin wrote:
> On Thu, 2012-06-14 at 12:20 +0900, Tejun Heo wrote:
> > On Wed, Jun 13, 2012 at 11:38:55PM +0200, Sasha Levin wrote:
> > > Hi all,
> > >
> > > I'm seeing the following when booting a KVM guest with 65gb of RAM, on latest linux-next.
> > >
> > > Note that it happens with numa=off.
> > >
> > > [ 0.000000] BUG: unable to handle kernel paging request at ffff88102febd948
> > > [ 0.000000] IP: [<ffffffff836a6f37>] __next_free_mem_range+0x9b/0x155
> >
> > Can you map it back to the source line please?
>
> mm/memblock.c:583
>
> phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0;
> 97: 85 d2 test %edx,%edx
> 99: 74 08 je a3 <__next_free_mem_range+0xa3>
> 9b: 49 8b 48 f0 mov -0x10(%r8),%rcx
> 9f: 49 03 48 e8 add -0x18(%r8),%rcx
>
> It's the deref on 9b (r8=ffff88102febd958).

* Can you please post disassembly of the whole function? It seems
like rsv->regions[] was corrupt. I want to verify other registers
too.

* Can you please try the following patch?

https://lkml.org/lkml/2012/6/15/510

Thanks.

--
tejun


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