RE: 2.6.29 acpi regression: acpi_ex_extract_from_field -- div by zero

Moore, Robert
2009-03-15T19:08:14Z

Can you please send or post the acpidump for the machine? Thanks.

>-----Original Message-----
>From: linux-acpi-owner@vger.kernel.org [mailto:linux-acpi-
>owner@vger.kernel.org] On Behalf Of Jiri Slaby
>Sent: Sunday, March 15, 2009 3:47 AM
>To: Len Brown
>Cc: linux-acpi@vger.kernel.org; rjw@sisk.pl; Linux kernel mailing list;
>torvalds@linux-foundation.org
>Subject: 2.6.29 acpi regression: acpi_ex_extract_from_field -- div by zero
>
>Hi,
>
>sometimes, when booting up/resuming from disk, I get an oops[1].
>
>obj_desc->common_field.access_bit_width is zero, but even after the
>loop. Division before the loop is apparently OK.
>
>This is the case:
> /* Mask off any extra bits in the last datum */
>
> buffer_tail_bits = obj_desc->common_field.bit_length %
> obj_desc->common_field.access_bit_width;
>
>.L39:
> xorl %edx, %edx #
> movzbl 37(%rbx), %esi #
><variable>.common_field.access_bit_width,
><variable>.common_field.access_bit_width
> movl 24(%rbx), %eax # <variable>.common_field.bit_length,
><variable>.common_field.bit_length
>--------------- here:
> divl %esi # <variable>.common_field.access_bit_width
> movl %edx, %ecx #, tmp121
> testl %edx, %edx # tmp121
> je .L41 #,
>
>[1] http://www.fi.muni.cz/~xslaby/sklad/panics/acpi_oops.png
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