On Wed, Jan 25, 2012 at 05:27:49PM +0100, Borislav Petkov wrote:
> Hi all,
>
> this is the oopsie I'm getting on 3.3-rc1 when inserting a Nokia
> internet stick CS-19 which has obviously a CD-ROM interface which
> is addressed through the SCSI layer. However, the blk request gets
> killed prematurely, causing a scsi_device * ptr to be NULL in
> scsi_prep_state_check(), which, IMHO, shouldn't happen, no matter
> whether the request is killed or not. Here's the relevant dmesg text and
> follow-up oops:
Btw,
I forgot to dump the actual function decode. So, according to the
register dump in the backtrace, we have %rdi = 0x0
And we are right at the beginning of scsi_prep_state_check:
scsi_prep_state_check:
pushq %rbp #
movq %rsp, %rbp #,
call mcount
movl 2536(%rdi), %eax # sdev_3(D)->sdev_state, D.34805
0000000000000b80 <scsi_prep_state_check>:
b80: 55 push %rbp
b81: 48 89 e5 mov %rsp,%rbp
b84: e8 00 00 00 00 callq b89 <scsi_prep_state_check+0x9>
b89: 8b 87 e8 09 00 00 mov 0x9e8(%rdi),%eax <-------------
b8f: 83 f8 02 cmp $0x2,%eax
b92: 75 04 jne b98 <scsi_prep_state_check+0x18>
b94: 31 c0 xor %eax,%eax
so sdev is NULL.
--
Regards/Gruss,
Boris.
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