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

OGAWA Hirofumi
2011-05-03T00:44:11Z

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

> OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> writes:
>
>> Tino Keitel <tino.keitel@tikei.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
>
> Although I'm not sure at all for now, I'm guessing something wrong
> happened around relocation.

BTW, rebuilding from scratch make something difference?