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SubjectRe: Early boot panic on machine with lots of memory
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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).



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