linux-kernel - Re: unable to handle kernel paging request when inserting FAT32 formatted flash media

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Message-ID: <87vcxsegbo.fsf@devron.myhome.or.jp>
Date:	Tue, 03 May 2011 10:14:03 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	linux-kernel@...r.kernel.org
Subject: Re: unable to handle kernel paging request when inserting FAT32 formatted flash media

OGAWA Hirofumi <hirofumi@...l.parknet.co.jp> writes:

> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp> writes:
>
>> Tino Keitel <tino.keitel@...ei.de> writes:
>>
>>>> > Yes, it is reproducible. It happens with a CF card from a Canon DSLR as
>>>> > well as with a SD card from a little Fuji cam. Configs are attached.
>>>> 
>>>> .config didn't have interest part for now. Could you send another oops,
>>>> and vfat.ko, fat.ko? I'd like to see more detail by assembler, current
>>>> oops is unclear...
>>>
>>> Another Oops, this time with the SD card, and the modules are attached.
>>>
>>>> And if possible, git bisect is appreciate.
>>>
>>> Lack of spare time currently, sorry.
>>
>> OK. Thanks for your help.
>
> It seems to be interesting exception.
>
> before relocation (from fat.ko)
>     8656:	74 51                	je     86a9 <fat_build_inode+0x2e9>
>     8658:	49 c7 c6 00 00 00 00 	mov    $0x0,%r14
>     865f:	b2 b6                	mov    $0xb6,%dl
>     8661:	80 3d 00 00 00 00 00 	cmpb   $0x0,0x0(%rip) <-- exception
>     8668:	74 3f                	je     86a9 <fat_build_inode+0x2e9>
>     866a:	49 8d 44 24 08       	lea    0x8(%r12),%rax
>
> after relocation (from oops)
>
>   20:	74 51                	je     73 <a+0x73>
>   22:	49 c7 c6 d8 91 13 a0 	mov    $0xffffffffa01391d8,%r14
>   29:	b2 b6                	mov    $0xb6,%dl
>   2b:	3d fc 9b 00 00       	cmp    $0x9bfc,%eax
>   30:	00 74 3f 49          	add    %dh,0x49(%rdi,%rdi,1)
>   34:	8d 44 24 08          	lea    0x8(%rsp),%eax
>
> relocation info would be this
>   0x0000000000006883  X86_64_32S      000000000000000000    +253 .rodata.str1.1

Whoops, wrong info.

relocation info should be this

  0x0000000000008663  X86_64_PC32     0x000000000000927c      -5 .LC55
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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