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

OGAWA Hirofumi
2011-05-03T00:41:16Z

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.