Re: oops with USB Storage on 2.6.14

[Andrew Morton]

Masanari Iida <standby24x7@xxxxxxxxx> wrote:
>
> Hello,
> I updated my system's kernel from 2.6.13.2 to 2.6.14,
> then it oops when I connect my Digital Camera via USB connection
> as USB storage device.
> I went back to 2.6.14-rc1, still the same panic happen.
> 2.6.13.2 and before, the kernel has been worked as expected.
> 
> CPU Intel P4(2.4Ghz)
> USB Device   Pentax Optio S40.
> 
> Unable to handle kernel paging request at virtual address dc9d1f4c
>  printing eip:
> c02b44cc
> *pde = 00073067
> *pte = 1c9d1000
> Oops: 0000 [#1]
> SMP DEBUG_PAGEALLOC
> Modules linked in: autofs e100 ipt_LOG ipt_state ip_conntrack
> ipt_recent iptable
> _filter ip_tables video rtc
> CPU:    1
> EIP:    0060:[<c02b44cc>]    Not tainted VLI
> EFLAGS: 00010286   (2.6.14)
> EIP is at scsi_run_queue+0xc/0xd0
> eax: 00000001   ebx: dc9d1e3c   ecx: d6b67910   edx: dc9d1e3c
> esi: d5048eb0   edi: dc9d1e3c   ebp: c1507e98   esp: c1507e84
> ds: 007b   es: 007b   ss: 0068
> Process ksoftirqd/1 (pid: 6, threadinfo=c1506000 task=dfe2dad0)
> Stack: 00000292 de3a7bf8 dc9d1e3c d5048eb0 dc9d1e3c c1507ea8 c02b4612 dc9d1e3c
>        da51bf60 c1507ecc c02b473f d5048eb0 00000000 00000024 00000286 00000001
>        d5048eb0 00000000 c1507f10 c02b4b2e d5048eb0 00000000 00000024 00000001
> 
> Call Trace:
>  [<c0103abf>] show_stack+0x7f/0xa0
>  [<c0103c72>] show_registers+0x162/0x1d0
>  [<c0103e90>] die+0x100/0x1a0
>  [<c039d7ae>] do_page_fault+0x31e/0x640
>  [<c0103763>] error_code+0x4f/0x54
>  [<c02b4612>] scsi_next_command+0x22/0x30
>  [<c02b473f>] scsi_end_request+0xcf/0xf0
>  [<c02b4b2e>] scsi_io_completion+0x26e/0x470
>  [<c02b4fc7>] scsi_generic_done+0x37/0x50
>  [<c02af9e5>] scsi_finish_command+0x85/0xa0
>  [<c02af89c>] scsi_softirq+0xcc/0x140
>  [<c0122085>] __do_softirq+0xd5/0xf0
>  [<c01220d8>] do_softirq+0x38/0x40
>  [<c0122685>] ksoftirqd+0x95/0xe0
>  [<c0131cfa>] kthread+0xba/0xc0
>  [<c0100ecd>] kernel_thread_helper+0x5/0x18
> Code: f0 8b 42 44 e8 16 7f 0e 00 89 45 ec 89 1c 24 e8 6b b7 ff ff eb aa 89 f6 8d
>  bc 27 00 00 00 00 55 89 e5 57 56 53 83 ec 08 8b 55 08 <8b> 82 10 01 00 00 8b 38
>  f6 80 85 01 00 00 80 0f 85 9e 00 00 00
>   <0>Kernel panic - not syncing: Fatal exception in interrupt
> 

Either a scsi bug or a USB bug.  Either way, regressions like this are a
top priority.

Could you please try disabling CONFIG_DEBUG_PAGEALLOC and retest?  If that
works OK, it's probably a use-after-free.

Thanks. 
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