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SubjectRe: Acpi deadlocks with 3.7.0-rc4
Dne 28.11.2012 18:02, Linus Torvalds napsal(a):
> On Wed, Nov 28, 2012 at 8:21 AM, Zdenek Kabelac <zkabelac@redhat.com> wrote:
>>
>> I've opened https://bugzilla.kernel.org/show_bug.cgi?id=51071
>> and attached picture there which is all I have.
>>
>> I'll try to decode exact code line.
>
> Uhhuh. It's missing much of the relevant parts of the code line, in
> particular the actual oopsing instruction. But what is there decodes
> to
>
> 41 b8 10 00 00 00 mov $0x10,%r8d
> 48 c7 c1 88 52 64 81 mov $0xffffffff81645288,%rcx
> 31 c0 xor %eax,%eax
> 48 c7 c2 98 52 64 81 mov $0xffffffff81645298,%rdx
> bf 00 04 00 0. mov $0x0.00400,%edi
>
> .. oops in here ..
>
> 74 33 je 0x50
> 48 89 df mov %rbx,%rdi
> e8 4d c9 00 00 callq ? <offset 0xc972>
> 48 89 d9 mov %rbx,%rcx
> 48 c7 c2 0a .. .. .. mov $0x......0a,%rdx
>
> which isn't really very obvious. Do you have that kernel around (or at
> least the same compiler and configuration)? Doing a
>
> objdump --disassemble drivers/acpi/acpica/nsaccess.o

I've attached bigger disasfun script output to BZ 51071.
https://bugzilla.kernel.org/show_bug.cgi?id=51071#c1


if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) !=
00000000000000a1 <acpi_ns_lookup+0xa1> cmpb $0xf,0x8(%rbx)
00000000000000a5 <acpi_ns_lookup+0xa5> je 0da <acpi_ns_lookup+0xda>

seems to be going out of bounds.

Zdenek



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